ADS-B Performance. APANPIRG ADS-B TASK FORCE SEMINAR Nadi, Fiji. Greg Dunstone Technology Development. Airservices Australia. Airservices Australia

Transcription

1 ADS-B Performance APANPIRG ADS-B TASK FORCE SEMINAR Nadi, Fiji Greg Dunstone Technology Development Airservices Australia Template Last Updated: 24 February 2005

2 Introduction & Overview Ground stations ATC systems

3 Typical ADS-B Receive only system DME OMNI ANTENNA GROUND STATION Thales ATM Ground station RF LOW NOISE AMPLIFIER SIGNAL PROCESSOR COMPUTER MDS= Better than 90 db MESSAGES TO ATC

4 Some sites power by Solar cells ADS-B takes only 100 watts!

5 Ground Surveillance DOWNLINK MESSAGES ADS-B OUT Typically broadcast 2 / second ASTERIX DATA FORMAT ADS-B Ground station

6 Ground station functions Receive and decode messages Position every 0.5 secs Ident every 5 secs Velocity every 0.5 secs Collate and package send every second or so Remote monitoring capability

7 Asterix Cat 21 Messages Adobe Acrobat Document

8 Burnett Basin Trial Experience

9 Mode S ADS-B gives excellent performance in Australia QFA715 CNS - BNE F410 QFA925 CNS - SYD F410 Qantas A330 ADS-B Operations 280 Nm 260 Nm 240 Nm 220 Nm QFA794 BNE CNS F410 ADS-B Ground Station Sensis Ground Bundaberg QFA924 SYD CNS F Nm 240 Nm QFA6140 BNE - SYD F Nm

10 BRISBANE TERMINAL AREA RADAR TOWER ADS-B ANTENNA

11 Better than radar

12

13 Radar 1030 Interrogate 1090 Reply At least 4-6 replies required every antenna scan Ie: At least 8-10 successful messages required

14 ADS-B 1090 Message In 5 seconds 10 position messages Only 1 needed for 5 second update!

15 ADS-B & Radar Velocity vectors (B200 Sharp turn)

16 Toulouse France Ground station

17 Airlines have ADS-B now ADS-B tracks Melbourne Area Evening 16 Feb 2005 On screen QFA - QANTAS VOZ - Virgin Blue UAE - Emirates JST - Jetstar ANZ - Air New Zealand HVN - Vietnam Airlines 50NM range rings

18 ADS-B Noise POSITION NOISE IN NM Actual vs Curve Fit STANDARD DEVIATION = NM (Sample = 3000 ADS-B reports) Anomaly 1 Anomaly

19 Radar & ADS-B Noise distribution VH-QPC System Tracks : ADS-B Position Noise vs Radar Position Noise ADS-B Position Noise Radar Position Noise 40 ADS-B Number of Reports Samples: 240 ADS-B system track reports 240 Multi radar system track reports Same aircraft Same 20 min time interval 30 RADAR Error tails Dist in nautical miles from Smoothed Track

20 Radar & ADS-B speed ADS_B RADAR ADS-B System Track - Speed Radar System Track - Speed Speed in Knots Speed in Knots ADS-B System Track Number Radar System Track Update Number

21 Heading noise ADS_B RADAR ADS-B System Track Heading - Variation from Mean Radar System Track Heading Variation from Mean Degrees Degrees ADS-B System Track Update Number -7 Radar System Track Update Number

22 Integrity

23 Integrity data POSITION + POSITION + GPS Calculate HPL ADS-B TRANSMITTER ADS-B GROUND STATION FOM (derived from HPL) POSITION + HPL / HIL ARINC130 NUC (derived from HPL) ATC SYSTEM

24 HPL / HFOM HFOM : Accuracy measure assuming that all satellites are operating correctly HPL : Integrity measure. Positional data within this limit with high degree of certainty (10-5 / flight hour) Even if a satellite gives false range data Based on GPS receiver ability to detect satellite false range data given Satellite geometry RAIM algorithm capability Assumption SA on/off WAAS signal received Geo satellite received

25 Good HDOP / HFOM Poor HPL Good accuracy Satellite A Satellite B Poor ability to detect error on Satellite A Poor HPL Satellite C Satellite D

26 Data quality (integrity) HPL =20 Nm HPL =2 Nm (VSP) HPL =0.5 Nm (VSP) Discard data Low Quality ADS-B Not as good as radar : Situational awareness symbol Use for CLAM/RAM As good as radar : Display Good position symbol Use for separation & safety nets HPL =0 Nm HPL =0 Nm

27 Discussion More details on Airservices Website Contact me : Greg Dunstone (02) greg.dunstone@airservicesaustralia.com