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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
Page last modified on February 11, 2010, at 03:45 PM