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The ability to support ASTERIX CAT-240 allows customers to receive ‘raw’ raw radar data without requiring Witness tools or a Navtech-supplied client library.
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For customers and integrators intending to use ASTERIX CAT-240, the documents assume a reasonable working knowledge of UDP network communication. They are targeted at technical teams, typically with software development skills, who are integrating the output from Witness a radar into external systems. |
Contents
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The Navtech-specific implementation, including specific configuration and extensions, is documented here: ASTERIX CAT-240 protocol for video dataProtocol For Video Data.
Network Configuration for Output Formats
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The radar output can be switched between the Navtech (Colossus) format and CAT-240 format via the Vertex user interface.
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Setting the output format is part of the radar operational configuration and can only be performed by an admin user. |
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Changing the output format only takes effect once the radar has been rebooted. |
To change the format to CAT-240:
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Log on as an admin user. Select System Configuration:
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Select the drop-down arrow in the Protocol field in the Data Output section:
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Select CAT-240 from the Protocol drop-down:
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Please refer to /wiki/spaces/PROD/pages/
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A confirmation message will be displayed. Select Commit Changes:
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A Data Applied Confirmation message will be displayed:
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You will then need to reboot the system for the Data Output changes to take affect:
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Click Reboot:
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Data Output Settings
IP Address: This is used in conjunction with the Sensor Port parameter and defines the endpoint that the UDP messages are sent to.
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If the IP Address specified is a multicast address (that is, an IP address between 224.0.0.1 and 239.255.255.255) this will enable multicast sending of the CAT-240 data to that address. |
Max Packet Size: This parameter specifies the maximum CAT-240 UDP packet size and is used to minimise potential problems of data loss when sending high-volume data over UDP.
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Message datagrams larger than the Max Packet Size will be split into smaller messages, with no message exceeding the Max Packet Size (although they may be smaller). |
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The default setting of 1400 will alleviate the data loss problem on most networks. However, the client (receiving) application will need to re-assemble multiple packets into a single azimuth of data. If the network configuration supports Jumbo Frames, the Max Packet Size may be set up to 9000 before packet loss may become a problem. Larger values increase the risk of data loss. |
More information about UDP packet loss and message splitting can be found here: https://navtechradar.atlassian.net/wiki/spaces/PROD/pages/2421260375/ASTERIX+CAT-240+protocol+for+video+data#Packet-fragmentation2269741293 for further information.
CAT-240 Output Example
Below is an example of the CAT-240 output:
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Please note that CAT-240 FFT (video) data is not contoured.
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