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Real Time Satellite Payload Testing in Compact Ranges ATMS 2012 Mumbai Astrium GmbH – 2012
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Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

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Page 1: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Real Time Satellite Payload Testing in Compact Ranges

ATMS 2012Mumbai

Astrium GmbH – 2012

Page 2: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 2

Content

1. Payload Testing – Why?

2. Which Tests are required?

3. Appropriate Test Facility

4. Theory and Measurement Set-Ups at a Glance

5. Equipment, Tools and Software

6. Conclusion

Page 3: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 3

Payload Testing – Why?

Page 4: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 4

Payload Testing – Why?

Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links via Earth Stations

Important Parameters of the Satellite for the Link Analysis are Received Signal ( IPFD) Transmitted Signal ( EIRP) Figure of Merit of the Satellite Receiver ( G/T)

This allows a calculation of the Carrier Power to Noise PowerSpectral Density (C/N0) which characterizes the RF link performance

The link performance (C/N0) conditions the quality of the baseband signal delivery to the customer in terms of: signal to noise ratio (S/N) for analog transmission bit error rate (BER) for digital transmission

Page 5: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 5

Required Tests

Page 6: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 6

Which tests are required ?

Link Analysis related tests are Equivalent Isotropic Radiated Power (EIRP)

Input Power Flux Density (IPFD)

Gain over Temperature (G/T)

Transponder Performance related tests are Amplitude Frequency Response (AFT)

Passive Intermodulation (PIM)

Group Delay

EMC related test is Auto-Compatibility

Page 7: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 7

Test Facility

Page 8: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 8

Appropriate Test Facility

In principle all types of indoor antenna test facilities which are large enough can be utilized for payload tests

From the practical point of view Compact Ranges Near-Field Ranges

are suitable for payload tests.

However, only in Compact Range facilities Real-Time tests can be performed

Compact Ranges with a large scanning focal length (e.g. a Compensated Compact Range) allow additionally a closed loop testing under radiated mode conditions

Combinations of radiated and test coupler test are possible, too

Page 9: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 9

Appropriate Test Facility (Cont’d)

Compensated Compact Range test principle for closed loop tests under real time conditions Transmit (Uplink) and Receive (Downlink) signal simultaneously

possible utilizing two range feeds and scanned test zones

ReceiveAntenna

TransmitAntenna

Trans-ponder

Synthesizer SpectrumAnalyzer

PowerMeter

Page 10: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 10

Appropriate Test Facility (Cont’d)

Principle of scanned test zones by shifted range feeds

Top View

Perspective View

Page 11: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 11

Appropriate Test Facility – Compact Range

Compensated Compact Range of Astrium GmbH (Ottobrunn/Munich)

CCR 75/60:Quiet Zone Size: = 5.5 m

CCR 120/100:Quiet Zone Size: = 8.5 m

Page 12: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 12

Appropriate Test Facility - High Power Test Capability

CCR 75/60 with installed Payload Module on Positioner in QZ;High Power Absorber Wall at QZ Side

CCR 75/60High Power Absorber Area:

Size: 6 m x 6 m

Absorber Type: E&CHFX-18 (HC)

Reflectivity: > 50 dB (typ.)Max. RF Power Density: 1.5 W / cm²Max. Temperature: 200 °C

Page 13: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 13

Theory and Measurement Set-Ups at a Glance

CCRRX

DownCCRRX

GLPP

EIRP,

,

EquipRX

SAT

N

CCRRX

N

EquipRXCCRRXDown

XPondSAT

C

CCRRXXPondDownUp

SATRX BkTGGL

GBTkGGLPLPGEIRP

P,

22

,,,2

,2,23

24

RLPDown

1223

, PPPP

EIRPLPBk

TG

CCRTX

Up

SAT

EquipRXSAT NNCP ,111

Page 14: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 14

Content of this section

This section explains the essential aspects of the most important payload test

Equivalent Isotropic Radiated Power (EIRP)

Input Power Flux Density (IPFD)

Gain over Temperature (G/T) @ Fixed Gain Mode of the S/C

Each test parameter is subdivided into

Theory

Principle Set-Up

Principle Test Procedure

Error Budget

Page 15: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 15

Theory of Test: EIRP (1/5)

Physical Background The Equivalent Isotropic Radiated Power (EIRP) describes the radiated power of

the satellite TX antenna in a certain direction

Usually the EIRP is measured at the Point of Saturation of the output amplifier of the Satellite

With the knowledge of the gain normalized TX antenna pattern it is sufficient to measure the EIRPmax at the maximum of the antenna gain

With the parameter EIRPmax the TX antenna pattern can be normalized to absolute EIRP values in [W or dBW]

SATTXSATTX GPEIRP ,,

Page 16: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 16

Principle Set-Up: EIRP (2/5)

Principle Set-Up

SATTXSATTX GPEIRP ,,

CCRRX

DownCCRRX

GLPP

EIRP,

,

24

RLPDown

Feed Range Horn

Spectrum Analyzer

DiplexTransponder

IPFD

EIRP

EIRP (dBW) IPFD (dBW/ m2 ) 58.0 - 58 to - 100

Example Satellite Data

Set-up for EIRP - Testing

Synthesizer

Feed Range Horn

Spectrum Analyzer

Power MeterSensor

calibrated Gain

for Sectrum monitoring and AM suppression measurement

Ldown

Lup

AM- Modulation Generator

calibrated Input Attenuation

Attenuators

10 dB

Connect directly for AM- Index Calibration

PTX,SAT PRX,CCR

GRX,CCR

GTX,SAT

Page 17: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 17

Principle Test Procedure: EIRP (3/5)

Major Steps of the Measurement

Calibration• Calibration of measurement set-up (signal paths, range antennas)

• Calibration of CCR-RX station AM demodulation sensitivity

Measurement• CCR-TX station:

Transmit AM modulated carrier with level stepped TX Power at CCR Feed

Measure and record TX Power and AM-index

• CCR-RX station:Measure AM level for detecting Point of Saturation

Measure RX Power with power meter via spectrum analyzer at Point of Saturation

Calculation of EIRP

Page 18: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

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Special Aspect: EIRP - Point of Saturation (4/5)

Pin

POut The Output Amplifier of the Satellite is working usually on a partly nonlinearcharacteristic

Received Signal @ Linear Region with modulated Carrier

Received Signal @ Non-Linear Region with modulated Carrier

Page 19: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

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Error Budget Estimation: EIRP (5/5)

Parameter Error Source Value(± dB) (± Linear) (± Linear)^2

ReceivePower Prx Power Measurement (absolute Power) 0,21 0,05 0,00250

Mismatch Error 0,11 0,03 0,00064Power Sensor Return Loss (dB) 18 0,00000

Attenuator (Latt) Return Loss (dB) 20 0,00000RX- Feed Gain Accuracy 0,15 0,04 0,00123Mismatch Error (Feed/L2/Attenuator Latt) 0,12 0,03 0,00081

TX - Feed Return Loss (dB) 17 0,000000,00000

Attenuator (L1) Calibration (dB) 0,15 0,04 0,001230,000000,00000

Grx + L2+ Latt Gain Stability during Test 0,05 0,01 0,00013RX- Feed Gain Accuracy 0,20 0,05 0,00222

0,00000Lp Distance Measurement 0,05 0,00 0,00000

Pointing Uncertainty 0,10 0,02 0,00054Influence of Quiet Zone taper on TA aperture 0,10 0,02 0,00054Point of Saturation Determination 0,50 0,12 0,01489Multiple Reflections 0,08 0,02 0,00035Leakage and Crosstalk 0,02 0,00 0,00002Set-up Calibration 0,10 0,02 0,00054Polarisation Uncertainty (LIN / CIRC) 0,05 0,01 0,00013

(EIRPsat) total Error ±(RSS) 0,65 0,16(EIRPsat) worst case Error 1,64 0,46

Page 20: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 20

Theory of Test: IPFD (1/4)

Physical Background

The Input Power Flux Density (IPFD) describes the received power at the satellite RX antenna in a certain direction

Usually the EIRP is measured at the Point of Saturation of the output amplifier of the Satellite

With the knowledge of the gain normalized RX antenna pattern it is sufficient to measure the IPFDmax at the maximum of the antenna gain

With the parameter IPFDmax the RX antenna pattern can be normalized to absolute IPFD values in [W/m2 or dBW/m2]

2max,,,

4|

RGP

IPFD CCRTXCCRTX

Saturation

Page 21: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 21

Principle Set-Up: IPFD (2/4)

Principal Set-Up

2max,,,

4|

RGP

IPFD CCRTXCCRTX

Saturation

Feed Range Horn

Spectrum Analyzer

DiplexTransponder

IPFD

EIRP

EIRP (dBW) IPFD (dBW/ m2 ) 58.0 - 58 to - 100

Example Satellite Data

Set-up for IPFD and EIRP (Gain)- Testing

Synthesizer

Feed Range Horn

Spectrum Analyzer

Power MeterSensor

calibrated Gain

for Sectrum monitoring and AM suppression measurement

Ldown

Lup

AM- Modulation Generator

calibrated Input Attenuation

Attenuators

10 dB

for AM- Index CalibrationPower Meter

Sensor

calibrated Input Attenuation

calibrated Gain

PTX,SAT PRX,CCR

GRX,CCR

GTX,SAT

PTX,CCR

GTX,CCR

Page 22: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 22

Principle Test Procedure: IPFD (3/4)

Major Steps of the Measurement

Calibration• Calibration of measurement set-up (signal paths, range antennas)

• Calibration of CCR-RX station AM demodulation sensitivity

Measurement• CCR-TX station:

Transmit AM modulated carrier with level stepped TX Power at CCR Feed

Measure and record TX Power and AM-index

• CCR-RX station:Measure AM level for detecting Point of Saturation

Calculation of IPFD

Page 23: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 23

Error Budget Estimation: IPFD (4/4)

Parameter Error Source Value(± dB) (± Linear) (± Linear)

TransmitPower Ptx Power Measurement (absolute Power) 0,21 0,05 0,00250

Mismatch Error 0,11 0,03 0,00064Power Sensor Return Loss (dB) 18 0,00000

Attenuator (Latt) Return Loss (dB) 20 0,00000TX- Feed Gain Accuracy 0,15 0,04 0,00123Mismatch Error (Feed/L1) 0,12 0,03 0,00081

TX - Feed Return Loss (dB) 17 0,000000,000000,00000

Gtx + L1 Gain Stability during Test 0,05 0,01 0,000130,00 0,00000

Lp Distance Measurement 0,05 0,01 0,00013Point of Saturation Determination 0,50 0,12 0,01489Pointing Uncertainty 0,10 0,02 0,00054Set-up Calibration 0,10 0,02 0,00054Polarisation Uncertainty (LIN / CIRC) 0,05 0,01 0,00013

(IPFDsat) total Error ±(RSS) 0,60 0,15(IPFDsat) worst case Error 1,28 0,34

Page 24: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 24

Theory of Test: G/T (Fixed Gain) (1/4)

Physical Background

The Gain over Temperature (G/T) describes the Figure of Merit of the Satellite Receiver

The G/T values is given in [1/K or dB/K]

1223

, PPPP

EIRPLPBk

TG

CCRTX

Up

SAT

Page 25: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 25

Set-up for G/T - Testing

DiplexTransponder

IPFD

EIRP

EIRP (dBW) IPFD (dBW/ m2 ) 58.0 - 58 to - 100

Example Satellite Data

Synthesizer

Feed Range Horn

Spectrum Analyzer

calibrated Gain

EIRPtx

Test Steps: - measure RX- chain noise power in Resolution BW - measure RX+ SAT noise power in Resolution BW - transmit and measure EIRPtx - measure total (noise +signal) receivepower in Resolution BW

Feed Range Horn

Spectrum Analyzer

Amplifier

Calibrated Attenuator

Power MeterSensor

21.4 MHz IF -O/P

Measurement of P3 and P2

Measurement of P1

Spectrum Analyzer

Amplifier

Power MeterSensor

21.4 MHz IF -O/P

Ptx

Termination 50 ž

Grx

Lup

Ldown Gant

Principle Set-Up: G/T (Fixed Gain) (2/4)

Principal Set-Up

PTX,SATPRX,CCR

GRX,CCR

GTX,SAT

GTX,CCR

PRX,CCR

1223

, PPPP

EIRPLPBk

TG

CCRTX

Up

SAT

EquipRXRXCCR GBTkP ,,1

EquipRXRXCCRDown

XPondSAT GGL

BGTkPP ,,12

EquipRXRXCCRXPondDownUp

SATRXCCRTX GGGLPLP

GEIRPPP ,,

,,23

GCCR,Equip

Page 26: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 26

Principle Test Procedure: G/T (Fixed Gain) (3/4)Major Steps of the Measurement

Prerequisite for Set-up Configuration Calibrate RX-chain gain Grx Calibrate Analyzer Gain from RF – input to IF – output in ZERO – span mode Calibrate uplink equipment gain (EIRP tx)

Satellite EGSE Set up communication path configuration Set X-ponder Gain and switch ON TWT

CCR Point SAT- RX – beam to boresight Measure RX-equipment noise power P1 (input terminated) Measure with Analyser the receive noise power level P2 at the center frequency of

the satellite channel (This level should be 10 dB below the maximum power range)

Transmit Low level uplink signal and observe receive spectrum / power meter Increase Uplink Level until the power meter reading for P3 ( total power: signal +

noise) is 3 to 6 dB higher than P 2 Record downlink receive Level P3 and Uplink synthesizer level (EIRPtx)

Calculate G/T

Page 27: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 27

Error Budget: G/T (Fixed Gain) (4/4)Parameter Error Source Value

(± dB) (± Linear)

B Calibration of Filter Noise BW 0,13 0,03

EIRP Power Measurement (absolute Power) 0,21 0,05Mismatch Error 0,11 0,03

Source Return Loss (dB) 18Attenuator (L1) Return Loss (dB) 20

TX- Feed Gain Accuracy 0,15 0,04Mismatch Error (Feed/Attenuator L1) 0,12 0,03

TX - Feed Return Loss (dB) 17

Attenuator (L1) Calibration (dB) 0,15 0,04

Power Ratios ∆P/P = 1/ √B*t 0,01 0,00B (MHz) 1,75t (sec) 0,1

Y1 (dB) 20∆Y1 0,06 0,01Y2 (dB) 5∆Y2 0,04 0,01

∆Y2 /(Y2-1) 0,00 0,00∆Y1/{Y1*(Y1- 1)} 0,01 0,00

Grx + G2 Gain Stability during Test 0,05 0,01

Lp Distance Measurement 0,00 0,00Pointing Uncertainty 0,05 0,01Polarisation Uncertainty (LIN / CIRC) 0,05 0,01

(G/T) total Error ±(RSS) 0,37 0,09(G/T) worst Case Error 1,03 0,27

Page 28: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

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Equipment, Tools and Software

Page 29: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 29

RF Set-Up Issues Complete Payload Test Solutions are available at the market

However, such an approach is expensive

Idea: Reuse of Existing Antenna Equipment Commercial payload test equipment solutions cover wide area

of tests, but do normally not fit to already existing antenna equipment Different Setups required!

For the typical system payload tests (EIRP, IPFD, G/T, AFR) reuse of already existing antenna equipment (H/W and S/W) is possible Cost Efficient!

Change of Setup Source of Possible Errors Source for Uncertainties Time Consuming

Solution: Centralized Test Unit (PTU) for Up- and Downlink routing with adapted payload toolbox which fits to the available antenna measurement software

Page 30: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 30

Solutions Payload Test Unit (PTU) Remote controlled Switch Matrix allows flexible signal routing

of the Uplink and Downlink Path Usable for Antenna and Payload Tests Complete Calibration Sequence can be handled via this unit with only a

few user interactions High reliability through high quality transfer switches

Common Software Test Environment Payload Toolbox extend already available antenna measurement

software Easy to use through common user interface for both types of

measurement Use of measured antenna pattern for calibration and / or measurement

point detection

Page 31: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 31

Payload Test Unit (PTU) Features Key Items

Measurement of different payload parameters: AFR, EIRP, IPFD, G/T, PIM

Measurement of antenna parameter with or without PTU

Payload in Fixed Gain or ALC mode

Design Criteria Generic set-up Frequency Range: 1 – 40 GHz Using of standardized and commercial quality equipment for highly accurate and

stable measurements Standard Device Communication: IEEE 488 (IEC-, GPIB) – Bus and LAN Determining the Point of Saturation by detecting the minimum sideband level of the

applied amplitude modulation Semi-Automatic measurement procedure

Page 32: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

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Payload Test Unit (PTU) Design (Cont’d)

Downlink Path

Uplink Path

0-11 dB 0-70 dBAtt 1 Att 2

SW 1

Coupler 1

Amp 1

Amp 2Sensor 1

Sensor 2

30 dB

I/P A

I/P B

Cal O/P

Power Meter

Spectrum AnalyzerSW 4

SW 5

SW 6

SW 7

SW 8

SW 9

SW 10

SW 11

O/P

RX-Feed

TX-Feed

X-ponderGsat Tsat

IPFD

EIRP

Uplink

Downlink

TX- Synth 2AM I/ PFM I/ P

TX- Synth 1AM I/ PFM I/ P

0-70 dBAtt 3

Coupler 2

SW 14

SW 13

0-70 dB

Test Translator

In

Out

Hybrid H1

Hybrid H2

WG Att 4Amp 3

Amp 4

SWITCH MATRIX

0.1 - 22 GHz

20 - 40 GHz

C 01

C 02 aC 02 b

C 02 c

C 02 d

C 02 e C 03 C 04

C 05

C 06

C 07

C 08

C 09 C 10 C 11 C 12 C 13 C 14

C 15

C 16C 17

C 18 a

C 18 b

C 19

C 20 a

C 20 b

C 21 a

C 21 b

C 22

C 23

C 24

C 25

C 26

LEGEND : C xx = RF connector Interface

External Cable Connections

not assigned

SW 2 SW3 SW 12 not assigned

L 01 L 02L 03 L 04

L 05

L 06

L 07

L 08

L 09 to L 14

L 15

L 16

L 17

L 18 L 19

L 20L 21

L 22

L 23

L 24

L 25

L 26

L xx

not assigned

Functional Blockdiagram of Payload Test - Equipment 5 / 5 / 04 lin

All Switches shown in Position 1

Page 33: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 33

Cost Efficient Payload Test Bench

Payload Test Unit PTU 4001

Power Meter

Spectrum Analyzer

Payload Test Unit PTU 4002

Page 34: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 34

Payload Software Toolbox Design

Test Definition Area Measurement Area

Direct Hardware Access Area

Page 35: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 35

Payload Software Toolbox Design (Cont’d)

• Payload Toolbox within the AAMS Software

• Point of Saturation Detection Mode

Page 36: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 36

Conclusion

Page 37: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

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Conclusion Motivation

Satellites requires payload testing prior to the launch Typical Payload Test

EIRP, IPFD, G/T, AFR, Auto-Compatibility and PIM Group Delay (if required) is typically carried out on subsystem level

Appropriate Test Facility for Real-Time Tess Compact Range Systems, e.g. the Compensated Compact Range due to the

large scanning focal length → Scanned test zones with closed loop testing

RF Set-up consists typically of RF Source(s), Spectrum Analyzer and Power Meter

Time Saving Equipment Payload Test Unit (PTU) and appropriate Software Toolbox Easy Switch of Setup between Calibration and Measurement Time Efficient due to fixed set-ups with pre-calibrated RF paths

Page 38: Real Time Satellite Payload Testing in Compact Ranges · Payload Testing – Why? Payload Testing characterizes Parameter which are required for the Link Analysis of Satellite Links

Page - 38

Questions

Thank You for Your Attention

Any Questions?