River boat data in ASTERIX Cat 240 format
- Jack Mulford
- John Marshall
As well as producing radar output in the colossus network protocol, Navtech Radars can be configured to produce a radar video output in ASTERIX Cat 240 format, as described on this page.
The network-capture recordings below are in pcap format and can be played back with a packet replay tool such as this one.
These recordings were made from a radar mounted onboard a vessel making a passage along the Swan River in Perth, Australia. Simultaneous Lat / Lon and heading data was recorded from a GPS device, enabling the radar data to be overlaid on a map, with heading corrected to North from GPS.
In the recording, the vessel passed underneath a bridge, and various static landmarks such as posts and a jetty, these can be seen in the radar image.
Radar range | 600 m |
Radar update rate | 4 Hz |
Range resolution | 0.175 m |
Angular resolution | 0.9° |
Beamwidth (azimuth x elevation) | 2° x 4° non-cosecant |
GPS header | NMEA 0183 ($GPGGA, $GPRMC, $HCHDG) |
GPS update rate | 1 Hz |
“21DecSwanRiverGarratBridgeUpstream.pcap” contains data from both the radar and GPS.
The radar data was sent from a radar 192.168.0.1 to an address of 239.192.43.78 on port 4378
The GPS data was sent from a device on 192.168.0.2 to an address of 192.168.0.23 on port 4000
To view the data in Cambridge Pixel SPX Server:
Set your network card to fixed IP address 192.168.0.23
Replay the .pcap file to your ethernet network port using Colasoft player
From SPX Server, set the Radar network input to 239.192.43.78 Port: 4378
From SPX Server, set the Nav data network input to 192.168.0.23 Port: 4000 (Alternatively, these addresses are pre-configured in the SPX Server config file available on the shared directory).
