Aviation Satelliteions 5-Nov

7/27/2019 Aviation Satelliteions 5-Nov

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AVIATION SATELLITE

COMMUNICATIONSAircraft wireless networks

-Vijayasaradhi


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Sky is Not the Limit

an aircraft, a satellite link, and a ground station


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LEARNING OBJECTIVES

Theory of Operation


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Why Essential

Internet connection to passengers

Data and Voice volumes


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Frequencies

Omega navigation10 - 14 kHz

ADF 190 - 1750 kHz

HF 2 - 30 MHz

Marker beacon 74.85, 75, 75.-5 MHz

VOR/LOC 108 118 MHz

VHF COM 118 - 136 MHz Glide slope 328 335 MHz

GSM 400 450 496 MHz

GSM 850 824 - 894 MHz

GSM 900 876 950 MHz

DME 960 - 1220 MHz TCAS/ATC 1030, 1090 MHz

GPS 1575 MHz


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GSM 1800 1710 1880 MHz

European UMTS 1880 - 2025, 2110 2200 MHz

GSM 1900 1850 - 1900 MHz

IMS band: 802.11b, Bluetooth 2446.5 - 2483.5 MHz

Low-range altimeter 4.3 GHz Microwave landing system 5.03, 5.09 GHz

802.11a 5.15 - 5.35 GHz

Weather radar 5.4 GHz

802.11a 5.725 - 5.825 GHz Weather radar 9.3 GHz

Sky radio11.7 GHz

DBS TV 12.2 - 12.7 GHz


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Theory of Operations

Aviation satellite communication provide voiceand data services for aviation safety services.

New type of avionics SDU (satcom data unit) willbe deployed and operated with global satellite

In addition to existing aircraft voice and datacommunication systems, ground based serverwill be deployed for data service.

Server will provide connectivity with the existing

aviation data networks, such as ARINC andSITA in support of AAC, AOC, and ATC datacommunications.


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Air to Ground Voice / Data


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Air to Air Voice/data


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Supports

supports voice,data, fax, and messaging

from Switched Telephone Network (PSTN)

Services basic voice calling (telephony),

short burst data, and RUDICS (TCP/IP)


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Segments

Space Segment (66 sats)

System Control Segment

Gateway Segment Subscriber Segment


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space segment

66 Space Vehicles in six low earth orbital planesthrough the earths polar axis

orbital period 100 minutes and an averagevelocity of 16557 MPH.

SV provide the communication links between theaircraft/aircraft/ gateways.

L-Band (1610 to 1626.5 MHz)

3Main Mission Antennas (MMA) links aircraft

SDU and the SV. Each MMA projects a pattern of 16 beams to the

ground


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System Control Segment

central management function

Components

Telemetry tracking and control sites (TTAC)

Control Facilities (CF)

Operational Support Network (OSN).


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Gateway Segment

Setup and maintain basic telephony services.

Provide messaging and data services (including

Direct Internet, RUDICS, dial-up data Short

Burst Data (SBD). Interface to the PSTN, or leased lines

Interface to the Constellation

Gateway functions. Messaging processing and services

Management and billing functions.


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Gateway

Gateway is split into two functional areas: The gateway management System (GMS)

The gateway operational elements

Gateway is comprised of the following network elements:

1) GSM switch (SSS)

2) Earth Terminals (ET)

3) ETC Transmission Subsystem (ETS)

4) ETC Communications Subsystem (ECS)

5) Message Origination Center (MOC)6) Notification Center (NC)

7) Web and Email messaging server (WEMS)

8) RUDICS

9) ETC Short Burst Data Subsystem (ESS)


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Subscriber Segment (Avionics)

ISU, L-band transceiver (LBT)

SDU (LBT and a I/F)

Antenna

permanent number stored on the SIM card Mobile Subscriber ISDN Number (MSISDN)

Cockpit audio control and recording systems, theaircraft

communication and reporting system (ACARS)

Multi-purpose control and display units (e.g.,CDU and MCDU)


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Ground Based Data Server

conduit and traffic controller for the data

for SDU and aviation networks (e.g.,

ARINC and SITA networks), and/or leased

lines to air traffic service providers insupport of AAC, AOC , ATC messaging


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Services Supported

Voice Service Acquisition

Access

V i S i


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Voice Service Acquiring a traffic channel on a SV (Acquisition) by the

subscriber unit ( SDU)

Accessing the gateway is process of obtaining the SDUsaccess to the

network which can include:

Geolocation - Call processing location determination

Aircraft SDU Parameter Download

Registration/Location update

Authentication of SDUs SIM including TMSI assignment(Authentication)

Call Establishment is the processes of setting up a call whichinclude:

Originating a call from an SDU (MOC) or PSTN via thegateway (MTC)

Terminating a call at an SDU (MTC) or PSTN number viathe gateway (MOC)

Call Maintenance is the process of maintaining a connectionwhich include Handoff, Reconfiguration (cutthrough/intercept/grounding).

Call Release

Call


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Call Handling Elements


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Acquisition

Acquisition: SDU obtaining a bidirectional TrafficChannel, between the SDU and a Space Vehicle(SV). SDU user taking action to request aservice that requires a channel, or by the SDUvia M/CDU

Classes: Network Iridium LLC Use

Aeronautical Safety Services

Fire, Police, Rescue Agencies

Emergency Calls

Regular Subscribers


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Access

Access process

determines the SDU location w.r.t Service

Control Areas defined in Earth Coordinates

immediately following Acquisition. Location GPS/Nav/CPLD

systems accuracy By

relative a/c to SV geometry


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Call

Call Establishment Registration / re-registration

Call from aircraft SIM verified

gateway alerts SDU ringing

Call Maintenance SDU handed off between SVs

SDU handed off between beams of SV SDU handed off different channel in same beam

Call Release


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Data Link

two type of data service SBD /RUDICS

Short Burst Data Service SBD

Aircraft (MU/CMU)to Ground server

RUDICS is circuit switched data service

integrated data solution remote asset monitoring,

control, and data file transfer


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Operations

Connectivity

Calling Characteristics (GSM delay 375 ms)

Security (Locked phases) Handling of Miss-directed PIN /Fraud Protection/Denial of Service

Quality of Service Measurement

System Outages and Maintenance Planed / unplanned /notification


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Avionics

Aviation Satelliteions 5-Nov

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