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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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Info

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.

Note

Setting the output format is part of the radar operational configuration and can only be performed by an admin user.

Info

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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2269741293 for further information.

CAT-240 Output Example

Below is an example of the CAT-240 output:

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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.

Info

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.

Info

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).

Note

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.

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Please note that CAT-240 FFT (video) data is not contoured.

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