ANNEX 2: to ESA-DTEN-NF-SOW/00010emits.sso.esa.int/emits-doc/ESTEC/AO-1-5489-GEP_10_RIMS... · 2010. 1. 13. · MRS Study SoW Annex 2 Technical Annex to MRS SoW Study V1.0, 14 March

ANNEX 2: to ESA-DTEN-NF-SOW/00010

prepared by/préparé par TEN-NEM/EGNOS Project Office reference/réference ESA-DTEN-NF-SOW/00010-A2 issue/édition 1 revision/révision 0 date of issue/date d’édition status/état Draft Document type/type de document RIMS NG Draft Element Requirements Document Distribution/distribution

RIMS NG ERD

RECORD OF REVISION:

Insert, replace or delete pages in the original document in accordance with the instructions given with the transmittal notice accompanying the revision.

Then replace this record of revision to reflect the latest revision.

Revision Pages Date Reason for revision

Draft 1 All May 14, 2007 Creation

Issue 1 All July 10, 2007 Update for ITT

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TABLE OF CONTENT:

1. SCOPE .............................................................................................................................6

2. INTRODUCTION .................................................................................................................7 2.1. Document Approval ...............................................................................................8 2.2. Applicable Documents ...........................................................................................9 2.3. Reference Documents ...........................................................................................9 2.4. List of Acronyms ..................................................................................................10

3. RIMS NG REFERENCE CONSTELLATION......................................................................12 3.1. GPS Nominal Constellation .................................................................................12 3.2. GALILEO Nominal Constellation .........................................................................12 3.3. GLONASS Nominal Constellation .......................................................................12

4. RIMS NG INTERNAL AND EXTERNAL INTERFACES REQUIREMENTS .................................13 4.1. External Interfaces...............................................................................................13

4.1.1. GNSS SiS ..............................................................................................13 4.1.2. RIMS External Interfaces with other MRS Ground Elements ................13

4.2. Internal Interfaces ................................................................................................13 4.2.1. RIMS NG data Interface.........................................................................13 4.2.2. RIMS NG Frequency Standard M&C.....................................................13

5. RIMS FUNCTIONAL REQUIREMENTS................................................................................14 5.1. RIMS NG Receive or Distribute Frequency Standard .........................................14 5.2. RIMS Data Collection ..........................................................................................14

5.2.1. RIMS NG Raw measurements synchronisation.....................................14 5.2.2. RIMS NG Raw Observables Datation....................................................14 5.2.3. RIMS NG Channel output rate ...............................................................14 5.2.4. Signal Reception....................................................................................14 5.2.5. Data Collection.......................................................................................15

5.3. RIMS NG Monitoring and Control Management ..................................................16

6. RIMS NG PERFORMANCE REQUIREMENTS......................................................................17 6.1. Frequency Standard Stability Requirements .......................................................17 6.2. RIMS NG Clock Drift ............................................................................................17 6.3. RIMS BG Data Collection ....................................................................................17

6.3.1. System wide global time availability.......................................................17

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6.3.2. RIMS NG time stamping ........................................................................17 6.3.3. Raw Measurements Datation.................................................................17 6.3.4. RIMS NG Channel Time allocation for SBAS Message.........................17 6.3.5. Transmission of Navigation messages ..................................................18 6.3.6. RIMS NG Channel Time allocation for Satellites Navigation data .........18 6.3.7. RIMS NG Channel Time allocation for raw data ....................................18 6.3.8. RIMS NG Raw measurements ageing...................................................18 6.3.9. Stability of RIMS NG analog reception chain.........................................18 6.3.10. C/No ratio measurement accuracy ........................................................18

6.4. Antenna phase center coordinates ......................................................................19 6.5. Inter-frequency Bias And Inter-Channel HW delay..............................................19

TBD 19 6.6. RIMS NG Channel warm start .............................................................................19 6.7. RIMS NG Channel cold start ...............................................................................19 6.8. Satellite re-acquisition time..................................................................................19 6.9. Observables Accuracy.........................................................................................20

6.9.1. Reference Interference and Multipath Conditions for Performance Assessment ...........................................................................................20

6.9.1.1. InBand/NearBand Interference Assumption ........................................... 20 6.9.1.2. Out-Of Band Interference Assumption ................................................... 20 6.9.1.3. Pulse Interference.................................................................................... 21 6.9.1.4. Multipath level cases............................................................................... 22 6.9.1.5. Ionospheric Conditions ........................................................................... 22 6.9.1.6. Tropospheric Conditions......................................................................... 22 6.9.1.7. Scintillation Conditions........................................................................... 22

6.9.2. Raw Phase Observables Accuracy........................................................22 6.9.2.1. Carrier Phase error - Noise...................................................................... 22 6.9.2.2. Carrier Phase error - multipath................................................................ 22

6.9.3. Raw Code Observables Accuracy .........................................................23 6.9.3.1. Code observables error - Noise ............................................................... 23 6.9.3.2. Code observables error - Multipath......................................................... 23 6.9.3.3. Feared Events at RIMS NG output ......................................................... 23

7. RIMS NG DESIGN CONSTRAINTS AND CONSTRUCTION REQUIREMENTS...........................24 7.1. Programmatic Constraints ...................................................................................24 7.2. Flexibility Requirements.......................................................................................24

7.2.1. Flexible Configurability...........................................................................24 7.2.2. Expandability..........................................................................................24

7.2.2.1. Stepwise development - receiver expandability...................................... 24 7.2.2.2. Upgrade Transition.................................................................................. 24 7.2.2.3. Unsupported interface version ................................................................ 25 7.2.2.4. Life time .................................................................................................. 25 7.2.2.5. Interfaces versions management ............................................................. 25

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7.2.3. Modular and Expandable S/W Architecture ...........................................25 7.2.4. Storage Space Expandability.................................................................25

7.3. Verification Requirements....................................................................................25 7.3.1. Availability of GPS L5/L2C, Galileo L1B/C and E5a/Eb, GEO L1/L5,

Glonass L2/L3........................................................................................25 7.3.2. Performances Verification constraints (GPS, GEO & GLONASS).........26 7.3.3. RIMS NG failure definition .....................................................................26 7.3.4. Special Tests and Examinations............................................................26 7.3.5. Traceability.............................................................................................26

7.3.5.1. Verification Methods .............................................................................. 26 7.3.5.2. Mandatory Verifications ......................................................................... 27 7.4. Implementation Requirements.............................................................................27

7.4.1. Pulse Mitigation Technique....................................................................27 7.4.2. Antenna contribution to multipath mitigation ..........................................27 7.4.3. Receiver technology w.r.t. cycle slips ....................................................27 7.4.4. L2 GPS processing technique (TBC).....................................................27 7.4.5. Raw measurements processing Constraints .........................................28 7.4.6. Man Machine Interface ..........................................................................28

7.4.6.1. RIMS Unit Status LEDs.......................................................................... 28 7.4.6.2. MMI Principles ....................................................................................... 28

7.4.7. Physical Characteristics.........................................................................28 7.4.7.1. RIMS indoor noise generated.................................................................. 28 7.4.7.2. RIMS NG antenna to RIMS Receiver cable length ................................ 28 7.4.7.3. RIMS NG Channel indoor surface.......................................................... 29 7.4.7.4. RIMS NG Anti-Tamper Measures .......................................................... 29 7.5. Transportability ....................................................................................................29 7.6. Portability .............................................................................................................29 7.7. Parts, Materials and Processes ...........................................................................29

7.7.1. Parts.......................................................................................................29 7.7.1.1. RIMS NG Design.................................................................................... 29 7.7.1.2. RIMS Components.................................................................................. 29 7.7.1.3. RIMS Hardware ...................................................................................... 29

7.7.2. Materials ................................................................................................30 7.7.3. Nameplates and Product Marking..........................................................30 7.7.4. RIMS Product Marking...........................................................................30 7.7.5. RIMS channel marking...........................................................................30 7.7.6. Workmanship .........................................................................................30 7.7.7. Interchange ability..................................................................................30

7.7.7.1. Line Replaceable Unit............................................................................. 30 7.7.7.2. Interchangeability.................................................................................... 30

8. RAMS REQUIREMENTS ..................................................................................................31

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9. OPERABILITY REQUIREMENTS.........................................................................................32

10. LOGISTICS......................................................................................................................33

11. PERSONNEL AND TRAINING.............................................................................................34

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1. SCOPE This document, provided as Annex 2 of the Statement of Work for the Development of a RIMS NG breadboard presents the better understanding that the Agency has today of the RIMS NG mission in the Multi-Constellation Regional System (MRS) considering parallel developments in the EGNOS and Galileo Programs.

An extract of the RIMS NG requirements document is publicly available with the ITT (containing some functional and performance requirements). Access to the full version of the document will be given to the bidder(s) winner. Whenever a TBD appears in the document, either the value is to be defined by the contractor or the value will be made available in the full version of this document.

It is not intended that these requirements are directly applicable for the breadboard development; however these shall be considered for the derivation of breadboard specifications and also shall be consolidated for future use in the development of RIMS NG operational receivers.

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2. INTRODUCTION One of the key and critical operational elements of EGNOS is the RIMS (Receiver Integrity Monitoring Station) receiver. In order to make possible the MRS mission, the RIMS receiver shall also diversify the number and type of GNSS signals that is capable to acquire and track. Currently, RIMS stations are composed of L1/L2 GPS/GLONASS receivers and a natural upgrade for MRS would consider an upgrade to GPS L1/L2/L5, Galileo L1/E5a/E5b and GLONASS L1/L2/L3 (TBC) frequencies1. These new GPS/Galileo E1/E5 signals appear to have longer codes that may imply longer (re-)acquisition (achievable with state-of-the-art technology), however they prove to show better tracking performance that current RIMS A/B and higher robustness to multipath and interference, potentially easing the selection of new or upgraded RIMS sites. The availability of state-of-the-art interference and multipath mitigation techniques will also help, together with the signal design, in facing extreme environmental conditions typical of the new frequency bands (such as DME/TACAN pulse interference in the E5 band). Moreover, the diversification of constellations and frequencies would allow, at system level, to review the number of RIMS channels and number of RIMS sites required for the MRS mission (considering system RAMS) The RIMS receiver is composed of the following elements:

- Antenna - Front-End - Core Processing Module - Core Computer (for Data Pre-processing and performance monitoring) - Clock

1 As defined by the MRS mission

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Figure 1 RIMS NG Components Overview

2.1. Document Approval

The present RIMS NG ERD is considered preliminary (Draft form) and as input for the RIMS NG BB development.

The document shall be reviewed for the derivation of RIMS NG BB specifications. Experimentation with the breadboard and Consolidation of the MRS Mission during the MRS Study will contribute to consolidate this document and make it baseline for the development of future RIMS NG Operational Receivers.

The document will eventually be maintained under configuration control for its use in a future development phase until milestone defined as System Acceptance and Final Review (SFAR) during the RIMS BG BB development activity.

Antenna & Pre-amplifier,

Filtering and Combiner

RIMS NG Core

computer

RIMS NG Receiver

(Front-End+ Core Module)

FEE

Atomic Clock

MRS Wide Area Network / SPEED Data Server

24V Power supply

GALILEO GLONASS GPS L1, L2, L5 E1B/C, 5a, E5b, E6 L1/L2/L3 (TBC)

Power Power

Data & M & C

Sync

Hubs

Ethernet

Hub

Raw Data & M & C

Freq Reference

M & C

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ESA intends to closely coordinate the consolidation of this document and its approval with the MRS Study Contractor who is in charge of consolidating the MRS Mission (in Europe).

2.2. Applicable Documents

Ref. Reference Title Need & Availability

AD [1] MRS Study SoW Annex 2 Technical Annex to MRS SoW Study V1.0, 14 March 2007 (MRS MRD)

See Annex 2 of MRS Study SoW (EMITS)

AD [2] Galileo SIS ICD Galileo Signal-In-Space Interface Control Document V12 Can be made available for the bidder winner(s) under NDA

AD [3] GPS L1C ICD Navstar GPS Space Segment/User Segment L1C Interfaces, Ref. Draft IS-GPS-800 Available at URL http://www.navcen.uscg.gov/gps/modernization/

AD [4] GPS L5 ICD Navstar GPS Space Segment / User Segment L5 Interfaces, Ref. ICD-GPS-705, 02 December 2002

Available at URL http://www.navcen.uscg.gov/gps/modernization/

AD [5] GLONASS ICD GLONASS Interface Control Document, GLONASS ICD Ref. V4.0 1998 Available at URL http://www.glonass-ianc.rsa.ru

AD [6] SBAS L5 Draft ICD EUROCAE – Signal Specification for SBAS L1/L5 ED-XXX Draft version B 0 date 03/2005 Can be made available for the bidder winner(s)

AD [7] DO229D Minimum Operational Performance Standards for Global Positioning System / Wide Area Augmentation System Airborne Equipment, Ref. RTCA MOPS DO-229D, 1st September 2006.

Available for purchase at URL http://www.rtca.org/

AD [8] EGNOS HW Standards EGNOS Software and Hardware Engineering Requirements E-RD-IMP-E-002-ESA, Is 2, Rev 0, 07/05/1997

Can be made available for the bidder winner(s)

AD [9] ICAO SARPS ICAO SARPS (Standards and Recommended

Practices) Annex 10 — Vol. I - Aeronautical Telecommunications - (Radio Navigation Aids).

Available at http://www.icao.int/

2.3. Reference Documents

The documents listed below are not considered essential for the proposal preparation; however they can be eventually made available if necessarily needed for this development.

Ref. Reference Title

RD [1] EGNOS Book EGNOS- The European Geostationary Navigation Overlay System – A cornerstone for Galileo, ESA Publications Division. http://www.esa.int/SPECIALS/ESA_Publications/SEMNMPN0LYE_0.html

RD [2] GSWS Galileo Software standards, GAL_SPE_GLI_SYST_A_issue 7

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http://www.navcen.uscg.gov/gps/modernization/http://www.navcen.uscg.gov/gps/modernization/http://www.navcen.uscg.gov/gps/modernization/http://www.navcen.uscg.gov/gps/modernization/http://www.glonass-ianc.rsa.ru/http://www.glonass-ianc.rsa.ru/http://www.rtca.org/http://www.esa.int/SPECIALS/ESA_Publications/SEMNMPN0LYE_0.htmlhttp://www.esa.int/SPECIALS/ESA_Publications/SEMNMPN0LYE_0.htmlhttp://www.icao.int/

RIMS NG ERD

2.4. List of Acronyms

Acronym Detail

ADD Architectural Design Document AGC Automatic Gain Control AIS Automatic Identification System AIV Assembly, Integration and Verification BB Breadboard ASFR Acceptance and System Final Review BIT Built-in Test BITE Built0in Test Equipment CCF Central Control Facility CDDS Commercial Data Distribution Service CDR Critical Design Review COTS Commercial Off the shelf CPF Central Processing Facility CPU Central Processing Unit DAL Development Assurance Level DDVP Design and Development Plan DJF Design Justification File DSP Discrete Signal Processor EC European Commission EDAS EGNOS Data Server EGNOS European Geostationary Overlay System ERIS External Regional Integrity Services ERNP European radio Navigation Plan ESA European Space Agency ESVS EGNOS Service Volume Simulator FPGA Field Programmable Gate Array FEE Front-End Equipment GEO Geostationary Earth Orbit GETR GSTB-V2 Experimental Test Receiver GJU Galileo Joint Undertaking GNSS Global Navigation Satellite Systems GPS Global Positioning System GRC Ground Receiver Chain GSA GNSS Super advisory Authority GSS Galileo Sensor Station ICAO International Civil Aviation Organisation ICD Interface Control Document I/F Interface I/NAV Integrity Navigation

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IRD Interface Requirement Document ISA Inter-Regional SBAS for Africa ISC Inter-Signal Corrections LCS Liability Critical Service LME Line Monitoring Equipment LRU Line Replaceable Unit MDAS MRS Data Server MEO Medium Earth Orbit MRD Mission Requirement Document MCR Mission Consolidation Review MRS Multi-Regional System MOPS Minimum Operational Performance Standards MT Message Type M&C Monitoring and Control NDA Non-Disclosure Agreement NLES Navigation Land-Earth Station PDR Preliminary Design review PBMF Performance Budget Management File PIDS Prime Item Document Specification xPL Protection Level (x: H- Horizontal or V-Vertical) PA Product Assurance PRS Public-Regulated Service PVT Position Velocity and Time RAMS Reliability Availability Maintainability Safety RIMS Regional Integrity Monitoring Station RFCS Radio Constellation Simulator RNP Required Navigation Performance SBAS Satellite-Based Augmentation System SOL Safety-Of-Life SoW Statement of Work SISNET Signal-In-Space in the Net SPEED Support Platform for EGNOS Evolutions and Demonstrations SoL Safety-of-Life SRD System Requirements Document SRR System Requirements Review SWRU Software Replaceable Unit TBC To be confirmed TBD To be defined TN Technical Note ULS Galileo Uplink station WAAS Wide Area Augmentation System WARTK Wide Area Real-Time Kinematic WAN Wide-Area Network

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3. RIMS NG REFERENCE CONSTELLATION

3.1. GPS Nominal Constellation The GPS Reference Constellation for the RIMS NG development is defined on RTCA-MOPS-DO229D, Appendix B “Standard GPS Assumption”.

3.2. GALILEO Nominal Constellation The Galileo Reference Constellation for the RIMS NG development is defined on Galileo MRD (AD [2])

3.3. GLONASS Nominal Constellation The GLONASS Reference Constellation for the RIMS NG (TBC) development is defined in GLONASS ICD (AD [5])

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4. RIMS NG INTERNAL AND EXTERNAL INTERFACES REQUIREMENTS

4.1. EXTERNAL INTERFACES

4.1.1. GNSS SiS This interface is a one way interface carrying navigation signal from all GNSS satellites GPS, Galileo, GEO and GLONASS. Only the GPS L1, L2 and L5 (AD [3],AD [4]), Galileo L1, E5 and E6 (AD [2]) and GLONASS frequencies (AD [5]) are part of this interface which in particular does not include the GEO uplink frequency.2

4.1.2. RIMS External Interfaces with other MRS Ground Elements The RIMS NG shall include external interfaces with other MRS elements, such as: - interface with the MRS network - interface with External Frequency Standard - Interface with MRD Data Server - Interface with hosting entity - Interface with MRS Control facilities - RIMS NG 1 PPS Interface - RIMS NG UTC interface when applicable (for calibration purposes) for a the provision timing

4.2. INTERNAL INTERFACES

4.2.1. RIMS NG data Interface This data format interface is part of the design activities undertaken by RIMS NG contractor. The data format shall be convertible into RINEX V3 (and vice versa).

4.2.2. RIMS NG Frequency Standard M&C For RIMS NG channel where a frequency standard is present, this interface enables the monitoring and control of the associated equipment. For RIMS channel where a frequency standard is not present, this interface will not be connected 2 ESA will decide which frequencies shall be finally implemented for the breadboard and which one for the operational receiver (MRS mission consolidation)

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5. RIMS FUNCTIONAL REQUIREMENTS

5.1. RIMS NG RECEIVE OR DISTRIBUTE FREQUENCY STANDARD All RIMS NG channels shall be able to receive a frequency standard signal coming from either the associated channel or from the hosting site (for example from an UTC laboratory). All RIMS NG channel shall be able to manage Frequency standard equipment for its internal use and for frequency standard signal delivery to the collocated RIMS channels. The design of the RIMS channel shall be adapted to any of the following configurations: - the channel monitors and controls a frequency standard, and provides TBD external 10 MHz signals, - the channel uses a 10 MHz external signal and provides its 'lock' status relative to this external signal. Note : The external sources can be of different nature (Rubidium, Caesium) and at least one of them shall be detected automatically

5.2. RIMS DATA COLLECTION The RIMS channel has the capability of collecting message satellites & raw measurement on the signal transmitted by satellites.

5.2.1. RIMS NG Raw measurements synchronisation Raw measurements for the different tracked satellites shall be sampled at a same instant in receiver time.

5.2.2. RIMS NG Raw Observables Datation The RIMS NG channel shall provide an estimation of Raw observables measurement date expressed in reception time, referenced towards Receiver local time. The RIMS NG channel shall provide this information in correspondence with associated output Raw observables.

5.2.3. RIMS NG Channel output rate RIMS NG channel output shall be provided at an output rate of 1Hz.

5.2.4. Signal Reception The RIMS NG Channel shall be able to process simultaneously

- all the L1/L2/L5 GPS SIS from all GPS satellite in view with an elevation angle higher than a configurable mask angle set by default to 5 (TBC) degrees

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- all the L1/E5a/E5b/E6 Galileo SIS from all Galileo satellite in view with an elevation angle higher than a configurable mask angle set by default to 5 (TBC) degrees

- all GLONASS L1/ L2 / L3 signals (TBC) from all GLONASS satellite in view with an elevation angle higher than a configurable mask angle set by default to 5 (TBC) degrees

- all GEO L1/L5 open signals up to TBD L1 channels and TBD L5 channels (GEO associated each SBAS system)

5.2.5. Data Collection Data shall be collected with output of the following observable every second according to this table

Data GPS L1 C/A

GPS L23

GPS L5 pilot

GPS L5 data

Galileo L1C

Galileo L1B

Galileo E5a pilot

Galileo E5a data

Galileo E5b pilot

Galileo E5b data

GLO L1

GLO L2/L3

GEO L1

GEO L5

Code measurements

X X X X X X X X X X X X X X

Phase measurements (accumulated Doppler)

X X X X X X X X X X X X X X

C/No X X X X X X X X X X X X X X

Coe carrier coherency indicator

X X X X X X X X X X X X X X

Signal status X X X X X X X X X X X X X X

Signal quality

X X X X X X X X X X X X X X

BER X X X X

Navigation data

50 bits

50 bits

50 bits

250 bits

50 bits

250 bits

50 bits

50 bits/TBD

250 bits

TBD

Receiver Channel Status

X

X

X

X

X

X

X

X

X

X

X

X

X

X

Satellite

3 GPS L2P(Y) and/or (TBC) GPS L2C

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PRN code X X X X X X X X X X X X X X

Measurement Date

X

X

X

X

X

X

X

X

X

X

X

X

X

X

Start Page Date

X X X

5.3. RIMS NG MONITORING AND CONTROL MANAGEMENT TBD

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6. RIMS NG PERFORMANCE REQUIREMENTS

6.1. FREQUENCY STANDARD STABILITY REQUIREMENTS The stability of the RIMS Frequency Standard

- with good Short and Medium term Stability (SMS), shall have an Allan deviation of TBD

- with good Medium and Long term Stability (MLS) shall an Allan deviation of TBD

6.2. RIMS NG CLOCK DRIFT The maximum RIMS NG clock drift shall be less than TBD sec/sec.

6.3. RIMS BG DATA COLLECTION

6.3.1. System wide global time availability The System wide global time shall be synchronised to GPS or Galileo time with an accuracy of +/-TBD ms .

6.3.2. RIMS NG time stamping All RIMS NG in or out going data shall be time stamped relative to the system wide global time. The System Wide Global Time is a time synchronised to GPS or GST 1 second epoch with an accuracy of +/- TBD. This time-stamping is independent from the general time-stamping performed by the communications network.

6.3.3. Raw Measurements Datation The RIMS NG channel shall indicate the time between system wide global time 1 second epoch and raw data measurement instant, with accuracy better than TBD.

6.3.4. RIMS NG Channel Time allocation for SBAS Message The total RIMS channel time to process an SBAS message shall not exceed TBD ms (TBC). The start event is the transmission of last bit of the SBAS message at satellite antenna, the

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final event is the reception at MRS WAN Interface of last bit of RIMS NG to MRS CPF message including this MRS message.

6.3.5. Transmission of Navigation messages The navigation message shall be transmitted every

- per 50 bits packets every second for GPS L1, GPS L2 (TBC), Galileo E5a, GPS L5, Galileo E5a or Glonass L1 and L2/L3 (TBC) string.

- per 250 bits packets every second for Galileo L1B, Galileo E5b GEO L1, . - TBD for GEO L5

(synchronised with the start of the page/subframe)

6.3.6. RIMS NG Channel Time allocation for Satellites Navigation data

The total RIMS channel time to process a 50 bits packet shall not exceed TBD ms and for 250 bits packet TBD seconds

The start event is the transmission of last bit of the packet at the satellite antenna, the final event is the reception at EWAN interface of last bit of RIMS to CPF message including this packet.

6.3.7. RIMS NG Channel Time allocation for raw data Last bit of raw measurements shall be provided to the EWAN interface within the 300 ms after each local time 1 second epoch.

6.3.8. RIMS NG Raw measurements ageing Raw measurements ageing shall not exceed TBD ms.

6.3.9. Stability of RIMS NG analog reception chain The stability of the analog reception chain starting at antenna phase centre shall be better than 1ns (1 sigma, TBC) in applicable environmental conditions (in-door and out-door). Note : Applicable environmental conditions are specified in section.

6.3.10. C/No ratio measurement accuracy

The RIMS NG shall provide the measurement of C/No with accuracy better than TBD.

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6.4. ANTENNA PHASE CENTER COORDINATES The Antenna phase centre geometrical coordinates (X, Y, Z) shall be defined with respect to an Antenna mechanical reference point with an accuracy better than 1cm (TBC) on each coordinates. The position of the antenna phase centres of a RIMS NG shall vary less than TBD for any azimuth and elevation.

6.5. INTER-FREQUENCY BIAS AND INTER-CHANNEL HW DELAY

TBD

6.6. RIMS NG CHANNEL WARM START The RIMS NG Channel maximum time from Power ON to operational mode shall be less than TBD minutes, provided the interruption duration is less than TBD minutes.

6.7. RIMS NG CHANNEL COLD START The RIMS NG Channel maximum time from Power ON to operational mode shall be less than TBD min when no context is available.

6.8. SATELLITE RE-ACQUISITION TIME The RIMS shall be capable to re-acquire the GPS, GALILEO, GEO and GLONASS satellites within 30s (TBC) after a loss of signal up to 1hour duration.

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6.9. OBSERVABLES ACCURACY

6.9.1. Reference Interference and Multipath Conditions for Performance Assessment

6.9.1.1. InBand/NearBand Interference Assumption

6.9.1.1.1. Nominal In-Band Interference (TBC)

TBD

6.9.1.1.2. Extreme In-Band Interference (TBC)

TBD

6.9.1.1.3. Nominal Near-Band Interference (TBD)

TBD

6.9.1.2. Out-Of Band Interference Assumption

6.9.1.2.1. GPS L1 Out-of-Band Interference Mask

In absence of GLONASS L1 processing, the RIMS NG Channel shall comply with interference rejection on GPS L1 upper band specified in figure below.

Figure 2: GPS/GEO out of band rejection characteristics for L1 (available in full version)

(Values are considered at the output port of a 0 dBi gain antenna).

6.9.1.2.2. GPS L2 Out-of-Band Interference Mask

The RIMS NG channel shall met the requested performances when it is exposed to out band interference specified in figure below for L2 frequency band (GPS).

Figure 3 Out-of band rejection characteristics for L2 (available on full version)

6.9.1.2.3. Galileo Out-of-Band Interference Mask

TBD

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6.9.1.2.4. GLONASS band Out-of-Band Interference Mask

The RIMS NG channel shall met the requested performances when it is exposed to out band interference specified in figure below for L1 frequency band (GPS and GLONASS).

Figure 4 Union of GPS and GLONASS out-of band rejection characteristics for L1 (available in full version)

(values are considered at the output port of a 0 dBi gain antenna).

6.9.1.3. Pulse Interference

6.9.1.3.1. In-band Pulse Interference (TBC)

The RIMS NG Channel shall meet the requested performances when it is exposed to in-band pulse interference as specified in Table below.

Interference thresholds (Pulse peak power)

TBD dBm

Maximum Pulse width

TBD µsec

Minimum Pulse width

TBD µsec

Maximum Pulse duty cycle

TBD%

References on Pulse Interference Scenarios shall be agreed with ESA

6.9.1.3.2. Out-Of-band Pulse Interference (TBC)

The RIMS NG Channel shall meet the requested performances when it is exposed to out-of-band pulse interference as specified in Table below.

Interference thresholds (Pulse peak power)

TBD dBm

Maximum Pulse width

TBD µsec

Minimum Pulse width

TBD µsec

Maximum Pulse duty cycle

TBD%

References on Pulse Interference Scenarios shall be agreed with ESA

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6.9.1.4. Multipath level cases Multipath Performance reference conditions for RIMS NG shall be Nominal (Favourable) Or Extreme (Unfavourable) D/U (Direct/Undirect Power level Ratio) Multipath level cases D/U(dB) Unfavourable (extreme) +10 Favourable (Nomninal) +30 Other Conditions: · Any multipath delay, · Any phase shift in the range [0°, 180°].

6.9.1.5. Ionospheric Conditions

TBD

6.9.1.6. Tropospheric Conditions

TBD

6.9.1.7. Scintillation Conditions

TBD

6.9.2. Raw Phase Observables Accuracy

6.9.2.1. Carrier Phase error - Noise Accuracy on GPS L1, GPS L2, Galileo L1, GPS L5, Galileo E5a, Galileo E5b, GLONASS L1/L2/L3 (TBC), GEO L1/L5 raw phase observables shall be better than TBD mm (1 sigma, TBC) in nominal Interference conditions or TBD mm (1 sigma, TBC) in extreme Interference conditions. NOTA BENE : The carrier phase measurement error accounts for all RIMS NG contributions (Satellite clock phase noise excluded). Only contribution above 0.1Hz is to be accounted NOTA BENE : The carrier phase measurement error should be considered as an average over the different elevations.

6.9.2.2. Carrier Phase error - multipath Accuracy on GPS L1, GPS L2, Galileo L1, GPS L5, Galileo E5a, Galileo E5b, GLONASS L1/L2/L3 (TBC), GEO L1/L5 raw phase observables due to multipath in the nominal or extreme RF environment shall be lower than (1 sigma, TBC): Multipath level cases Error Extreme TBD mm Nominal TBD mm

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6.9.3. Raw Code Observables Accuracy

6.9.3.1. Code observables error - Noise

Error due to RIMS NG Receiver noise on raw code observables shall be lower than (1 sigma, TBC)

GPS

L1 C/A

GPS L2 GAL L1B/C

Galileo E5b

Galileo E5a

GEO L1 GEO L5 Glonass L1

Glonass L2/L3

Nominal 4(cm)

TBD TBD TBD TBD TBD TBD TBD TBD TBD

Extreme 5(cm)

TBD TBD TBD TBD TBD TBD TBD TBD TBD

6.9.3.2. Code observables error - Multipath

Error due to RIMS NG Receiver multipath on raw code observables shall be lower than (RMS, TBC)

GPS L1 C/A

GPS L2 GAL L1B/C

Galileo E5b

Galileo E5a

GEO L1 GEO L5 Glonass L1

Glonass L2/L3

Nominal (cm)

TBD TBD TBD TBD TBD TBD TBD TBD TBD

Extreme (cm)

TBD TBD TBD TBD TBD TBD TBD TBD TBD

(Values provided at 45 deg, assuming a variation with elevation angle in 1/tan (Elevation).

6.9.3.3. Feared Events at RIMS NG output A list of Events shall be considered at RIMS NG output. 4 Nominal refers to Nominal Continous Interference Conditions as specified in section 6.9.1 and pulse interference specifications to reach full performance as specified 6.9.1. Effects of interference shall be assumed combined in the assessment of performance 5 Extreme refers to Extreme Continous Interference Conditions as specified in section 6.9.1 and pulse interference specifications to stay in lock as specified 6.9.1. Effects of interference shall be assumed combined in the assessment of performance.

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7. RIMS NG DESIGN CONSTRAINTS AND CONSTRUCTION REQUIREMENTS

7.1. PROGRAMMATIC CONSTRAINTS

7.2. FLEXIBILITY REQUIREMENTS

7.2.1. Flexible Configurability The RIMS NG design shall allow flexible configurability and optimise its performance considering the diversity of Signal-In-Spaces sources and constellations (eg iono compensation, anomalies detection, excessive interference and multipath detection etc)

7.2.2. Expandability This paragraph specifies the possibility of modification and expansion of the item, i.e. the particular item components which must be able to withstand an expansion of capacity (in memory space, computing capacity, add-on cards, electric power supply, etc.) without bringing their design into question.

7.2.2.1. Stepwise development - receiver expandability

The RIMS NG shall be designed starting from a Breadboard easily upgradeable towards an operational receiver, considering the increase of the number of available satellites/signals

7.2.2.2. Upgrade Transition

The RIMS NG channel design shall not preclude the upgrade transition linked with the interface version management.

When RIMS NG channel is upgraded, it will be remotely configurable in:

-’version compatibility’, namely it will present performances and transmit data exactly as before upgrade, and accept data both compliant with the ’before’ and ’after’ upgrade interface definition,

- ’full operational mode’ namely an upgraded RIMS NG channel will present performances, accept and transmit data compliant with the ’after upgrade’ interface definition. It may however accept data compliant with the ’before upgrade’ interface definition.

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7.2.2.3. Unsupported interface version

When a RIMS NG receives data with an interface version definition unsupported or unknown, the data shall be discarded and the event shall be flagged.

7.2.2.4. Life time

RIMS NG shall be designed for life time of TBD years after Factory Qualification Review.

The requirement must be understood as a constraint on the ageing of components.

7.2.2.5. Interfaces versions management

RIMS output interfaces versions shall be remotely configurable through MRS WAN. Reason : It is necessary to deal with an interface modification without bringing down the whole system

7.2.3. Modular and Expandable S/W Architecture RIMS NG SW architecture shall be modular and allow easy expandability.

7.2.4. Storage Space Expandability

It shall be possible to add or replace storage space, memory, without impacting the RIMS NG software design.

7.3. VERIFICATION REQUIREMENTS

7.3.1. Availability of GPS L5/L2C, Galileo L1B/C and E5a/Eb, GEO L1/L5, Glonass L2/L3

The Verification of RIMS NG design shall be performed with the constraints of having limited number of Signal-In-Space for GPS L5, L2, Galileo L1/E5 and GLONASS L1 and L2/L3.

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7.3.2. Performances Verification constraints (GPS, GEO & GLONASS)

Unless otherwise specified in the requirements, RIMS channel requirements concerning raw measurements performances shall be verified in the following conditions for input GPS, GALILEO, GEO, GLONASS signals : * Minimum satellites elevation angle of 5 degrees (TBC), * Minimum input signals as specified in (AD [2],AD [3],AD [4],AD [5],AD [6],AD [7] ).

7.3.3. RIMS NG failure definition In order to verify the MTTF, the following definition of RIMS NG failure shall be applied : - lack of valid output data for any satellite as defined in future MRS RIMS ICD above minimal elevation angle and above minimum input signal, - unrepaired cycle slip over any output data for any satellite above minimal elevation angle and above minimum input signal.

7.3.4. Special Tests and Examinations TBD

7.3.5. Traceability

7.3.5.1. Verification Methods Final compliance with the requirements of the present specification can, depending on the type of requirement, be verified by one of the following methods: Analysis ( A ) Analysis concerns the determination of the essential qualities, performance and limitations of an item by cognitive or computational methods. The basic data for an analysis is normally recovered through testing, estimation or reusing data from former experiences. This verification method is frequently used to verify performance requirements that can not or only with extremely expenditure verified by testing. The analysis itself requests in most of the cases a high rate of expenditure, i.e. computer power. Additionally, a lot of effort is necessary to prepare the analysis process. The quality of the result of the analysis depends on an accurate analysis preparation as well as on the analysis process itself. Inspection ( I ) The inspection method concerns visual observation or dimensional verification/simple measurement of an item. The verification relies on the human senses (vision, touch). This method is frequently used for verification of environmental conditions and manufacturing or physical characteristics of the products. The inspection procedure is not suitable for the verification of performance requirements.

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Demonstration ( D ) Demonstration concerns the verification of the operational characteristics observable on the operating item, without having recourse to physical tests. The demonstration method is mainly applicable to functional requirements. Test ( T ) A test procedure is a formal process of exercising or putting to trial a system or item by manual or automatic means to identify differences between specified, expected and actual results. It concerns quantitative measurements under controlled conditions through a rigorous process. A test campaign is usually concluded by the comparison of the test results to predicated success criteria. The verification of performance requirements often makes an additional evaluation/computing process through a mathematical modelled analysis necessary.

7.3.5.2. Mandatory Verifications

TBD

7.4. IMPLEMENTATION REQUIREMENTS

7.4.1. Pulse Mitigation Technique

The RIMS NG shall implement state of the art pulse mitigation technique(blanking) such that the tracking errors on code and carrier phase measurements due to thermal noise and pulse interference are not degraded compared to the applicable requirements on observables accuracy

7.4.2. Antenna contribution to multipath mitigation Merged design of the RIMS NG receiver and of the antenna pattern shall be optimized to ensure required acquisition performance and then, with lower priority, to reject multipath signals.

7.4.3. Receiver technology w.r.t. cycle slips The RIMS NG shall not cause cycle slips which are an odd multiple of pi (TBC).

7.4.4. L2 GPS processing technique (TBC) The receiver shall process L2 GPS signals using a technique which performances are at least compliant with semi-codeless type technique in terms of acquisition performance in order to maximise L2 GPS signals availability.

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7.4.5. Raw measurements processing Constraints When processing the satellites Raw Measurements, RIMS NG sub-system shall : - not apply satellite group delay that are broadcast in the corresponding navigation message, - not correct the relativistic effect, - not correct Geometric Range correction (also called Sagnac effect), - not correct tropospheric effect, - not correct ionospheric effect, - not apply satellite clock corrections that are broadcast in the corresponding navigation message, - not apply corrections that are broadcast in the EGNOS GEO message.

7.4.6. Man Machine Interface

7.4.6.1. RIMS Unit Status LEDs

The main RIMS NG items shall be equipped with visual status indicators (LED for example). At least the following states shall be indicated: - power on, - operational mode, - running mode, - failed mode, - loaded mode, - test mode, - initialised mode. Any additional relevant status can be proposed by subcontractors.

7.4.6.2. MMI Principles

The MMI shall respect the principles identified in [RD [2]]. The MMI principles are only necessary for the Local Maintenance Equipment.

7.4.7. Physical Characteristics

7.4.7.1. RIMS indoor noise generated The RIMS NG indoor equipment shall generate noise less than TBD dBA. RIMS NG performances shall be assessed for nominal following noise condition: less than TBD dBA (with air conditioning and lighting in function).

7.4.7.2. RIMS NG antenna to RIMS Receiver cable length

RIMS NG performances shall be met with a cable length between antenna and receiver up to 80 meters.

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7.4.7.3. RIMS NG Channel indoor surface

RIMS NG indoor equipment shall be installed inside a TBD m2 surface.

7.4.7.4. RIMS NG Anti-Tamper Measures

The RIMS NG shall not have manual adjustment controls (e.g. knobs, switches, permanent keyboards, or potentiometer controls) on the outside of the unit or such controls shall be available by remote CCF commands.

The power switches are not considered as adjustment controls.

7.5. TRANSPORTABILITY Equipment shall be built so to ease disassembling, packing and transportation from one location to another.

7.6. PORTABILITY Portability is the capability of a device for being transferred from one hardware and/or software environment to another is not required.

7.7. PARTS, MATERIALS AND PROCESSES

7.7.1. Parts

7.7.1.1. RIMS NG Design The design of the RIMS NG shall be such that the application of the specified test procedures shall not produce a condition detrimental to the performance of the equipment, except as specifically allowed in this PIDS.

7.7.1.2. RIMS Components

The components selected for the use in the development and production of the RIMS shall be compliant with AD [8].

7.7.1.3. RIMS Hardware

The RIMS Hardware shall be compliant with requirements of MRS future mission.

This document describes among others:

- The volume,

- The weight,

- ...

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7.7.2. Materials This sub-paragraph specifies the particular instructions relating to certain materials (toxicity, moisture level, galvanic coupling, etc.): prohibition of use or protections to be adopted. No requirements are expressed.

7.7.3. Nameplates and Product Marking

7.7.4. RIMS Product Marking RIMS products identification and marking shall be compliant with requirements of [AD 09] and configuration identification as defined in [DRD 1070/1].

7.7.5. RIMS channel marking All RIMS channels shall include areas for TBD marks (logo).

7.7.6. Workmanship No requirements are expressed.

7.7.7. Interchange ability

7.7.7.1. Line Replaceable Unit The design of the MRS elements shall be modular allowing removal/installation of Line Replaceable Units (LRUs) wherever possible to enable off line repairs.

7.7.7.2. Interchangeability Components with the same part number, but provided by different suppliers, shall be completely interchangeable.

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8. RAMS REQUIREMENTS TBD

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9. OPERABILITY REQUIREMENTS TBD

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10. LOGISTICS TBD

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11. PERSONNEL AND TRAINING

TBD

34

ScopeIntroductionDocument ApprovalApplicable DocumentsReference DocumentsList of Acronyms

RIMS NG REFERENCE ConstellationGPS Nominal ConstellationGALILEO Nominal ConstellationGLONASS Nominal Constellation

RIMS NG Internal And External Interfaces RequirementsExternal InterfacesGNSS SiSRIMS External Interfaces with other MRS Ground Elements

Internal InterfacesRIMS NG data InterfaceRIMS NG Frequency Standard M&C

RIMS Functional RequirementsRIMS NG Receive or Distribute Frequency StandardRIMS Data CollectionRIMS NG Raw measurements synchronisationRIMS NG Raw Observables DatationRIMS NG Channel output rateSignal ReceptionData Collection

RIMS NG Monitoring and Control Management

RIMS NG Performance RequirementsFrequency Standard Stability RequirementsRIMS NG Clock DriftRIMS BG Data CollectionSystem wide global time availabilityRIMS NG time stampingRaw Measurements DatationRIMS NG Channel Time allocation for SBAS MessageTransmission of Navigation messagesRIMS NG Channel Time allocation for Satellites Navigation daRIMS NG Channel Time allocation for raw dataRIMS NG Raw measurements ageingStability of RIMS NG analog reception chainC/No ratio measurement accuracy

Antenna phase center coordinatesInter-frequency Bias And Inter-Channel HW delayTBD

RIMS NG Channel warm startRIMS NG Channel cold startSatellite re-acquisition timeObservables AccuracyReference Interference and Multipath Conditions for PerformaInBand/NearBand Interference AssumptionNominal In-Band Interference (TBC)Extreme In-Band Interference (TBC)Nominal Near-Band Interference (TBD)

Out-Of Band Interference AssumptionGPS L1 Out-of-Band Interference MaskGPS L2 Out-of-Band Interference MaskGalileo Out-of-Band Interference MaskGLONASS band Out-of-Band Interference Mask

Pulse InterferenceIn-band Pulse Interference (TBC)Out-Of-band Pulse Interference (TBC)

Multipath level casesIonospheric ConditionsTropospheric ConditionsScintillation Conditions

Raw Phase Observables AccuracyCarrier Phase error - NoiseCarrier Phase error - multipath

Raw Code Observables AccuracyCode observables error - NoiseCode observables error - MultipathFeared Events at RIMS NG output

RIMS NG Design Constraints and Construction RequirementsProgrammatic ConstraintsFlexibility RequirementsFlexible ConfigurabilityExpandabilityStepwise development - receiver expandabilityUpgrade TransitionUnsupported interface versionLife timeInterfaces versions management

Modular and Expandable S/W ArchitectureStorage Space Expandability

Verification RequirementsAvailability of GPS L5/L2C, Galileo L1B/C and E5a/Eb, GEO L1Performances Verification constraints (GPS, GEO & GLONASS)RIMS NG failure definitionSpecial Tests and ExaminationsTraceabilityVerification MethodsMandatory Verifications

Implementation RequirementsPulse Mitigation TechniqueAntenna contribution to multipath mitigationReceiver technology w.r.t. cycle slipsL2 GPS processing technique (TBC)Raw measurements processing ConstraintsMan Machine InterfaceRIMS Unit Status LEDsMMI Principles

Physical CharacteristicsRIMS indoor noise generatedRIMS NG antenna to RIMS Receiver cable lengthRIMS NG Channel indoor surfaceRIMS NG Anti-Tamper Measures

TransportabilityPortabilityParts, Materials and ProcessesPartsRIMS NG DesignRIMS ComponentsRIMS Hardware

MaterialsNameplates and Product MarkingRIMS Product MarkingRIMS channel markingWorkmanshipInterchange abilityLine Replaceable UnitInterchangeability

RAMS RequirementsOperability RequirementsLogisticsPersonnel and Training