Introduction
This section discusses the Track Distribution Protocol.
Contents
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Each message includes a header of 6 bytes followed by a variable length payload. The header includes the protocol version, message type and payload size enabling the client software to reliably decode the payload data as required.
Field | Type [Size] | Description |
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Version | uint8_t [1] | Protocol version – indicates the revision of the protocol messages |
Message Type | uint8_t [1] | Message type – indicates the type of the payload |
Payload Length | uint32_t [4] | The length, in bytes, of the main body of the message |
Track Distribution Message
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The payload of this message is a Protobuf object representing the track sighting data. For more information on Google Protocol Buffers please see reference [https://developers.google.com/protocol-buffers/]. Navtech can provide Protobuf message files (.proto) on request.
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syntax = "proto3"; package TrackProtobuf; message DistributionTrack { string uniqueid = 1; int32 trackid = 2; int32int64 senderid = 3; uint32 channelid = 4; double speedmps = 5; double coursedegrees = 6; int32 classification = 7; double classificationprobability = 8; double xposition = 9; double yposition = 10; double latitude = 11; double longitude = 12; string tag = 13; double sizeinaz = 14; double sizeinrange = 15; uint32 seen = 16; int32 coasts = 17; int64 laneuserid = 18; int64 sectionuserid = 19; string carriagewayname = 20; } |
Protobuf Fields
Field | Description |
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UniqueId | A string representation of a GUID that represents the unique Id of the track. |
TrackId | User friendly numeric Id for each track. Note that this Id is not unique across the system. |
SenderId | User friendly numeric Id of the radar which generated the track. This value represents the User Id which is configured in the Witness software. |
ChannelId | This is the index of tracking channel from which the track was generated. Typically in |
ClearWay™, this will represent the channel use for each carriageway. | |
SpeedMps | The speed of the track in metres / second. |
CourseDegrees | The course of the track in degrees. |
Classification | The track classification Id. Options are:
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ClassificationProbability | The confidence level of the classification represented as a value between 0 and 1. |
XPosition | X coordinate of the track based on the local Witness site coordinate system. |
YPosition | Y coordinate of the track based on the local Witness site coordinate system. |
Latitude | Latitude coordinate of the track based on WGS84 datum. |
Longitude | Longitude coordinate of the track based on WGS84 datum. |
Tag | User friendly name / description of the track. Typically not used in |
ClearWay™. | |
SizeInAz | The size of the track along the azimuth. |
SizeInRange | The size of the track along the range. |
Seen | Number of sightings of the track. |
Coasts | Monitors the number of times a target is perceived to be coasting. |
LaneUserId | User friendly numeric Id for each carriageway lane. |
SectionUserId | User friendly numeric Id of the section. |
CarriagewayName | Name of the carriageway. |
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