DR + GPS

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Lassen DR + GPS Reference Manual 89

Position, heading and speed values are from GPS measurements. Code-carrier

filtering has been applied, but not velocity (PV) or DR filtering. These fixes will be

quite noisy in urban environments.

0x32-01: UTC Time and Constellation Summary Message Table 63: 0x32-01: UTC Time and Constellation Summary Message

Byte Name Type Units Range /

Value Meaning

Code U8 0x32
Subcode U8 0x01
0-1 UTC year U16 2000+
2 UTC month U8 [1, 12]
3 UTC day U8 [1, 31]
4 UTC hour U8 [0, 23]
5 UTC minute U8 [0, 59]
6 UTC second U8 [0, 60] = 60 only for the leap second
7 UTC / GPS offset U8 GPS = UTC + offset
8-9 PDOP U16 2-8
10-11 HDOP U16 2-8
12-13 VDOP U16 2-8 0
>0
2D position
3D position
14 Max DGPS age U8 Sec <255
255
Seconds
Overage or invalid
15 0-3 GPS Status U4 0
2
3
5
6
7
8
Doing position fixes
Need time
PDOP too high
No usable SVs
One usable SV
Two usable SVs
Three usable SVs
15 4-5 Time source U2 0
1
2
3
System clock
RTC
GPS (< 10 ms)
GPS (< 1 ms)
16 0-1 Search Mode U2 0
1
2
None
Blind
Anywhere
16 7 Almanac Status U1 1 = Complete
17 0-3 Number of SVs
Visible
U4 [0,12]