ASAS TN

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ASAS TN Third Workshop Toulouse 19-21 April
2004Session 3 THALES ATM PresentationGround
Systems for ADS-B based Surveillance
Presenter Peter HOWLETT
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Introduction Overview

• Australian Upper Airspace Project an example of
  an early operational application of ADS-B-NRA
• AS 680 An example of an ADS-B Ground Station
• Typical issues
• Redundancy
• Coverage overlap
• Ground Station Status Monitoring
• Concluding Remarks

3
Introduction Overview

• Australian Upper Airspace Project an example of
  an early operational application of ADS-B-NRA
• AS 680 An example of an ADS-B Ground Station
• Typical issues
• Redundancy
• Coverage overlap
• Ground Station Status Monitoring
• Concluding Remarks

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Australian Upper Airspace Project

• Project initiated by Airservices Australia
• Radar-like separation services above FL300, based
  on ADS-B
• Will be presented tomorrow by Greg Dunstone
  (Airservices Australia)
• Contract recently awarded to Thales ATM for the
  provision of 56 ADS-B Ground Stations
• A good example to illustrate ground systems
  associated with ADS-B NRA
• and some typical issues to be addressed

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Australian Upper Airspace Project - GS System
Architecture
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Introduction Overview

• Australian Upper Airspace Project an example of
  an early operational application of ADS-B-NRA
• AS 680 An example of an ADS-B Ground Station
• Typical issues
• Redundancy
• Coverage overlap
• Ground Station Status Monitoring
• Concluding Remarks

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AS 680 Key Features

• ADS-B reporting based on Mode S extended Squitter
  
• Long Range Capability (250 NM at FL300)
• ASTERIX Cat 21 Output
• Compact, autonomous Unit for unmanned Operation
• Automated Built-In Testing down to LRU Level
• Flexible Network communication
• Full Remote Control via SNMP down to LRU Level
• Range of options, e.g.
• GPS Time Reference System
• Uninterrupted Power Supply
• Outdoor packaging
• Selected by Airservices Australia for the Upper
  Airspace Program coverage of Australian
  airspace above FL300

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Main AS 680 Components
SPC Power PC
LNALow-Noise Amplifier
Omni Antenna
3 m
SPB Thales ATM SignalProcessing Board
RXU Thales ATM Receiver Unit
FBX Filterbox
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AS 680 Technical Data

• Max. demonstrated Range 250 NM
• Sensitivity - 90 dBm
• Dynamic Range 80 dB
• Mean Pos. update rate 1 / s
• Localisation capacity 150 Targets/s
• Time of Arrival resolution 128 MHz (7 ns / 2.4
  m)
• Power Supply 110 .. 240 V / 47 .. 63 Hz
• Dimensions (w x h x d) 483 x 178 x 350 (19,4HU)
• Weight 19.5 kg
• Site Monitor Module 0 dBm, 1090 MHz ICAO Annex
  10 compliant

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Technical Tools
Technical Traffic Situation Display Technical
System Control User Interface
 
Recording and Playback Facility
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Introduction Overview

• Australian Upper Airspace Project an example of
  an early operational application of ADS-B-NRA
• AS 680 An example of an ADS-B Ground Station
• Typical issues
• Redundancy
• Coverage overlap
• Ground Station Status Monitoring
• Concluding Remarks

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Redundancy

• Need to ensure availability gt redundancy
  throughout the system
• At GS level (HW failures)
• At communication network level
• At processing level in ATC centre

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Redundancy at Ground Station level
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Redundancy at Communication level
AS 680
AS 680
AS 680
AS 680
AS 680
AS 680
AS 680
AS 680
2-way Satellite or Terrestrial Comm. Link.

Ground Network
All Ground Station Data, i.e.ADS-B Operational
Data as Asterix Cat 21 as UDP Multicastand
Maintenance Data as SNMP on UDP/IP
All Ground Station Data, i.e.ADS-B Operational
Data as Asterix Cat 21 as UDP Multicastand
Maintenance Data as SNMP on UDP/IP
RCMS Melbourne
RCMS Brisbane
ADS-B Test Bed
ADS-B LAN A
ADS-B LAN A
ADS-B LAN B
ADS-B LAN B
TAAATSMelbourne
TAAATSBrisbane
Service LAN
Service LAN
SSF
TAAATS Time Server
TAAATS Time Server
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Redundancy at Processing Level (example)
DDN
or
VSAT link
ATMB
Mux
ATMB
Mux
Ground
Router if required
station 1A
DDN
or
VSAT link
Ground
ATMB
Mux
ATMB
Mux
Router if required
station
1B
ADSB
Eurocat
LAN
DDN
or
BYPASS
VSAT link
Ground
ATMB
Mux
ATMB
Mux
Router if required
B
station 2A
DDN
or
LAN
ADS-
VSAT link
Ground
station
2B
ATMB
Mux
ATMB
Mux
Router if required
DDN
or
VSAT link
Ground
ATMB
Mux
ATMB
Mux
Router if required
station
3A
FDP
ADSB FP
DDN
or
VSAT link
Ground
station
3B
ATMB
Mux
ATMB
Mux
Router if required
SNMAP
FDP
Upgrade
Radar data
MMI

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Introduction Overview

• Australian Upper Airspace Project an example of
  an early operational application of ADS-B-NRA
• AS 680 An example of an ADS-B Ground Station
• Typical issues
• Redundancy
• Coverage overlap
• Ground Station Status Monitoring
• Concluding Remarks

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Coverage Overlap

• 1 Aircraft can be received by several Ground
  Stations
• Need to eliminate duplicate targets
• Function performed at Centre level in ADSBP

GS2 A/B
GS1 A/B
GS4 A/B
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Introduction Overview

• Australian Upper Airspace Project an example of
  an early operational application of ADS-B-NRA
• AS 680 An example of an ADS-B Ground Station
• Typical issues
• Redundancy
• Coverage overlap
• Ground Station Status Monitoring
• Concluding Remarks

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GS Status Monitoring

• Need to monitor proper operation of Ground
  Station
• Need to unambiguously locate faulty elements for
  quick/efficient maintenance
• How do you test the RF loop?
• Remote site monitor ?
• Collocated site monitor ?

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Bite Principle Illustrated

• RF loop tested by collocated site monitor

Extended
Squitter
AS 680
Site Monitor
AS 680
To RCMS
(SNMP)
Cross-over BITE Summary
Site Monitor BITE Summary
BITE Summary
.

Own Ground Station BITE, (including RF loop)
1090 Mhz Extended Squitter (DF18) transmitted
through DME antenna probes
Maintenance Laptop

Monitoring of other
Ground Station Bite

Pre-Configuration (Shell)

Monitoring and
Detailed BITE
Configuration (SNMP)

Details via SNMP or within

Tests and Diagnosis
User Shell

Recording/Replay

Technical Situation
Display
To RCMS (SNMP)
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Introduction Overview

• Australian Upper Airspace Project an example of
  an early operational application of ADS-B-NRA
• AS 680 An example of an ADS-B Ground Station
• Typical issues
• Redundancy
• Coverage overlap
• Ground Station Status Monitoring
• Concluding Remarks

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Concluding Remarks

• ADS-B NRA is arguably one of the simplest
  applications of ADS-B, yet many issues and design
  decisions have had to be addressed
• more to come?
• Operational trials and early implementations
  are essential
• build confidence in ADS-B
• uncover and address issues
• establish and validate rules and procedures
• refine standards and learn to use existing ones

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THANK YOU