Deluo TRISTAR25 - Manual (Page 28)

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28
4.2.2.4 EverMore Binary Output Message 0x08: Measurement Data
Purpose
Output:
1 GPS time.
2 Clock offset.
3 Numbers of satellites in view.
4 Satellite ID, elevation angle, channel status, pseudo-range, delta-range, and satellite
Doppler frequency. This set of data is sent for each in-view satellites.
Format
Byte # Contents Range Size Scale Unit
1 Message ID = 0x08 Unsigned byte
2 ~ 3 GPS week 0 ~ 65535 Unsigned 16bit integer week
4 ~ 7 GPS tow 0 ~ 60479900 Unsigned 32bit integer 1/100 sec
8 ~ 9 Clock offset 0 ~ 65535 Unsigned 16bit integer
10 Number of SV in view 0 ~ 12 Unsigned byte
Channel Data (14 bytes per channel). Repeated for each in-view satellites.
Byte # Contents Range Size Unit
1 ~ 2 Channel
SV
Elevation
bit(0:3) 1 ~ 12
bit(4:8) 1 ~ 31
bit(9:15) 0 ~ 90
Unsigned byte
Unsigned byte
Unsigned byte Degree
3 Channel Status
bit0 = 1 satellite acquired
bit1 = 1 code-tracking loop locked
bit2 = 1 carrier-tracking loop locked
bit3 = 1 data-bit synchronization done
bit4 = 1 frame-synchronization done
bit5 = 1 ephemeris data collected
bit6 = 1 used for position fix
4 Reserved
5 ~ 8 Pseudo-Range +/- 2^31 Signed 32bit integer Meter
9 ~ 12 Delta-Range +/- 2^31 Signed 32bit integer Meter/sec
13 ~ 14 Doppler 0 ~ 65535 Unsigned 16bit integer Hz
Total length of message 0x08: 10 + 14 * Number Of Visible Satellites
Minimum length: 8 bytes (0 satellite in view)
Maximum length: 178 bytes (12 satellites in view)