1.1 KiB
1.1 KiB
Airspy protocol
Ports
- ??: server -> client feed
Format
Textual format, similar to raw, but extended with MLAT and signal
level data. Unlike raw format, lines are terminated with 0x0d 0x0a (\r\n).
Frame structure
0x2a(*)- 7 or 14 byte frame (see raw)
0x3b(;)- 4 byte MLAT timestamp (see below)
0x3b(;)- 1 byte MLAT precision (see below)
0x3b(;)- 2 byte big-endian RSSI
0x3b 0x0d 0x0a(;\r\n)
MLAT timestamp
The MLAT timestamp included in each frame is the big-endian value of a counter
at the time of packet reception. The counter runs at a rate determined by the
precision value multiplied by 2 MHz (e.g. 0x0a means 10 * 2 MHz = 20 MHz).
This counter isn't calibrated to external time, but receiving software can
calculate its offset from other receiving stations across multiple packets, and
then use the differences between station receive timing to calculate signal
source position.
Examples
*5DA7DA1CE30DE5;D03B5A4B;0A;7AF3;\r\n*8DA07CD89915908778A01E4B4C86;D03D33F9;0A;8437;\r\n