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NAV – SVINFO (0x01 0x30)
It periodically polls the information about UTC time.
Header ID Data Length Data Checksum
0xB5 0x62 0x01 0x30 8+N*12 See below CK_A CK_B
Data
Offset bytes Format Descriptions Notes
0 U4 GPS time of week (ms)
4 U1 Number of channels 1 ~ 16
5 U1 Reserved
6 U2 Reserved
The following data will be repeated N times (number of channels).
8+N*12 U1 Channel number 0 ~ 15
9+N*12 U1 PRN number (SV ID)
10+N*12 U1 Flags for the above specified SV Bit mask
0x01 – used for navigation
0x02 – differential correction
data available
0x04 – ephemeris or almanac
available
0x08 – ephemeris available
0x10 – unhealth status (shall not
be used)
0x20,0x40,0x80 – reserved
11+N*12 I1 Signal quality indicator for the
above specified SV
0 – idle
1,2 – searching
3 – signal detected but unused
4 – code lock
5,6 – code and carrier locks
7 – code and carrier locks,
receiving navigation message
data (50 bps)
12+N*12 U1 CN0 (dBHz) Carrier to noise ratio
13+N*12 I1 Elevation (degrees) Integer value
14+N*12 I2 Azimuth (degrees) Integer value
16+N*12 I4 Pseudo range residual (cm)