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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
36
Bits 4 00EA1BD4 Bit 15342548
Ms 2 000D Ms 13
Chips 2 0392 Chip 914
Code Phase 4
2
-16
00009783 Chip
/2
-16
38787
Carrier Doppler 4
2
-10
000DF45E Rad/2ms
/2
-10
914526
Time Tag 4 000105B5 Ms 66997
Delta Carrier
2
4
2
-10
FF90F5C2 Cycles
/2
-10
-7277118
Search Count 2 0000 0
C/NO 1 1 24 dBHz 36
C/NO 2 1 28 dBHz 40
C/NO 3 1 27 dBHz 39
C/NO 4 1 27 dBHz 39
C/NO 5 1 23 dBHz 35
C/NO 6 1 27 dBHz 39
C/NO 7 1 24 dBHz 36
C/NO 8 1 24 dBHz 36
C/NO 9 1 27 dBHz 39
C/NO 10 1 29 dBHz 41
Power Loss
Count
1 05 5
Phase Loss
Count
1 00000007 7
Integration
Interval
2 0013 Ms 19
Track Loop
Iteration
2 003F 63
Payload Length:51 bytes per satellite tracked (up to 12)
1.For further information,go to Table 45
2.Multiply by (1000÷4π)÷2
16
to convert to Hz.
The meaning of I.D.5 is described as following table
Message ID: Each SiRF binary message is defined based on the ID.
Channel: Receiver channel where data was measured (range 1-12).
SVID: PRN number of the satellite on current channel.
State: Current channel tracking state (see Table 45)
Bit Number: Number of GPS bits transmitted since Sat-Sun midnight (in Greenwich)
at a 50 bps rate.
Millisecond
Number:
Number of milliseconds of elapsed time since the last received bit(20
ms between bits)
Chip Number: Current C/A code symbol being transmitted (range 0 to 1023
chips;1023 chips=1 ms).
Code Phase: Fractional chip of the C/A code symbol at the time of sampling(scaled
by 2
-16
,=1/65536)
Carrier Doppler: The current value of the carrier frequency as maintained by the
tracking loops.
Receiver Time
Tag:
This is the count of the millisecond interrupts from the start of the
receiver (power on) until the measurement sample is taken. The ms
interrupts are generated by the receiver clock.
Delta Carrier
Phase:
The difference between the carrier phase(current) and the carrier
phase(previous). Units are in carrier cycles with the LSB= 0.00185 carrier
cycles. The delta time for the accumulation must be known.
Note –Carrier phase measurements are not necessarily in sync with
code phase measurement for each measurement epoch.
Search Count: This is the number of times the tracking software has completed full
satellite signal searche.s
C/No: Ten measurements of carrier to noise ratio(C/No) values in dBHZ at
input to the receiver.Each value represents 100 ms of tracker data and
its sampling time is not necessarily in sync with the code phase
measurement.
Power Loss
Count:
The number of times the power detectors fell below the threshold between the
present code phase sample and the previous code phase sample. This task is
performed every 20 ms (max count is 50).