NavCom Sapphire Rev.J - Manual (Page 265)

Sapphire Technical Reference Manual Rev. J
265
2.15 CHNLSTATUS1B (Version 2; v0.3.0.3) (Binary)
SF-3050 Sapphire SF-3040
This output message reports status information on all of the ASIC channels that are searching
or tracking, as well as the status of the StarFire
™ channel. The body of the CHNLSTATUS1B
message is listed in Table 109, with descriptions of the fields in the sections indicated.
Table 109: CHNLSTATUS1B Binary Message Data
Data Item (9 + (4 + 6 * M) * N Bytes) Data Type Section
Cooperative tracking setting and StarFire CNØ U08 2.6.1
StarFire tracking status U08 2.6.2
StarFire satellite ID U32 2.6.3
Start type and number of visible satellites U08 2.6.4
Position status and number of satellites tracked U08 2.6.5
Almanac available U08 2.6.6
Start here with one Block per PRN 2.6.7
2.15.1 Cooperative Tracking and StarFire CNØ
The MSB (bit 7)
describes the setting for cooperative tracking, where a “1” means
cooperative tracking is ON and a “0” means it is off. The remaining bits in this field
represent the signal-to-noise ratio for the StarFire channel, in db/Hz, scaled so the LSB
represents 0.25 db/Hz.
2.15.2 StarFire Tracking Status
This value indicates the tracking status of the StarFire Channel. If the channel is not in
use, the value will be 1. When the signal is locked and data bits are being produced, the
value will be 9. StarFire tracking status values are shown in Table 110.
Table 110: StarFire Tracking Status Values
Code Description
0 Wait for power
1 Processing is disabled
2 Wait for AGC to settle
3 Start of processing
4 Signal detection
5 Signal detection failed
6 Frequency verify
7 Signal acquisition with AFC and code pull-in
8 AFC plus Costas pull-in
9 Locked; creating data bits