BeiDou almanac report
The BeiDou almanac report is sent when Command Packet 54h is used to request the almanac for one satellite or all satellites. The Command Packet 54h SUBTYPE byte (byte 4) is set to twenty-two (22) when requesting the report. Data follows the format specified by GPS ICD-200.
The following table shows the additional records provided in Report Packet 55h when almanac data is included.
|
Subtype 22: BeiDou almanac |
||||
|---|---|---|---|---|
|
Byte |
Item |
Type |
Value |
Meaning |
|
6–9 |
ALM DECODE TIME |
4 (unsigned long) |
|
Full GPS seconds from the start of GPS Time |
|
10–11 |
AWN |
2 (short) |
|
|
|
12–15 |
TOA |
4 (unsigned long) |
|
|
|
16–23 |
SQRTA |
8 (double) |
|
|
|
24–31 |
ECCENT |
8 (double) |
|
|
|
32–39 |
ISUBO |
8 (double) |
|
|
|
40–47 |
OMEGADOT |
8 (double) |
|
|
|
48–55 |
OMEGSUBO |
8 (double) |
|
|
|
56–63 |
OMEGA |
8 (double) |
|
|
|
64–71 |
MSUBO |
8 (double) |
|
|
|
72–73 |
ALM HEALTH |
2 (short) |
|
Bit 9 (MSB): not set = satellite clock OK
|
|
74–81** |
ASUBF0 |
8 (double) |
|
|
|
82–89** |
ASUBF1 |
8 (double) |
|
|
|
90 |
ALM-SRC for BeiDou |
1 (byte) |
|
|
|
---------- End of Subtype 22 ---------- |
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