UBLOXDataFormat / NAV-SVINFOSpaceVehicleInformation
NAV-SVINFO Space vehicle information
Message
| NAV-SVINFO
| Description
| Space vehicle information
| Message structure
| Header
| ID
| Length
| Payload
| Checksum
| 0xB5 0x62
| 0x01 0x30
| 8+NCH*12
| 8+NCH*12 bytes
| CK_A CK_B
| Payload contents:
| Byte offset
| Number format
| Scaling
| Name
| Unit
| Purpose/Comment
| 0
| U4
| -
| ITOW
| ms
| GPS millisecond time of week
| 4
| U1
| -
| NCH
| -
| Number of channels, range 0..16
| 5
| U1
| -
| RES1
| -
| Reserved
| 6
| U2
| -
| RES2
| -
| Reserved
| Start of repeated block (NCH times)
| 8 + N*12
| U1
| -
| chn
| -
| channel number, range 0..NCH-1
| 9 + N*12
| U1
| -
| SVID
| -
| Satellite ID
| 10 + N*12
| U1
| -
| Flags
| -
| Bitmask, made up of the following bit values:
0x01 = SV is used for navigation
0x02 = Differential correction data is available for this SV
0x04 = Orbit information is available for this SV (Ephemeris or Almanach)
0x08 = Orbit information is Ephemeris
0x10 = SV is unhealthy / shall not be used
0x20 = reserved
0x40 = reserved
0x80 = reserved
| 11 + N*13
| I1
| -
| QI
| -
| Signal Quality indicator (range 0..7). The following list shows the meaning of the different QI values:
0: This channel is idle
1, 2: Channel is searching
3: Signal detected but unusable
4: Code Lock on Signal
5, 6: Code and Carrier locked
7: Code and Carrier locked, receiving 50bps data
| 12 + N*13
| U1
| -
| CNO
| dbHz
| Carrier to noise ratio - signal strength
| 13+ N*13
| I1
| -
| Elev
| deg
| Elevation in integer degrees
| 14 + N*13
| I2
| -
| Azim
| deg
| Azimuth in integer degrees
| 16 + N*13
| I4
| -
| PRRez
| cm
| Pseudo range residual in centimetres
|
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