DR + GPS
STARTER KIT REFERENCE MANUAL
Lassen DR + GPS Reference Manual 102
0x28-12: Almanac Initialization
The elements of the almanac message match subframes 4 and 5 as downlinked
by the satellite. TLM words, HOW words and parity bits are omitted. The data in
this message may change after initialization through data decode. A 10-bit Week
Number of Applicability is added as a time tag.
If the information is unknown, all data fields are zero. To erase almanac health
information in the DR GPS module, set this data with source byte equal to zero
(Invalid / Clear).
Table 77: 0x28-12: Almanac Fixed Point Report Message
Byte Name Type Units/LSB Range / Value Meaning
Code U8 0x28
Subcode U8 0x12 Almanac
Index U8 1 – 32 SV PRN
0 0-2 Source U3 0
1
2
3
Invalid / Clear
Host Input
Host Override
Data Decode
0 3 Newness U1 0
1
From BBRAM
New
0 6-7 GPS Week Extension U2 2 MSBs of WNoa
1 WNoa U8 IDC-200C
2-25 Compressed Almanac 24xU
8