RoyalTek REB-3000 Operational Manual page 41

RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
Bits
Ms
Chips
Code Phase
Carrier Doppler
Time Tag
Delta Carrier 2
Search Count
C/NO 1
C/NO 2
C/NO 3
C/NO 4
C/NO 5
C/NO 6
C/NO 7
C/NO 8
C/NO 9
C/NO 10
Power Loss
Count
Phase Loss
Count
Integration
Interval
Track Loop
Iteration
Payload Length:51 bytes per satellite tracked (up to 12)
1.For further information,go to Table 45
2.Multiply by (1000 4 ) 2
The meaning of I.D.5 is described as following table
Message ID:
Channel:
SVID:
State:
Bit Number:
Millisecond
Number:
Chip Number:
Code Phase:
Carrier Doppler:
Receiver Time
Tag:
Delta Carrier
Phase:
Search Count:
C/No:
Power Loss
Count:
4 00EA1BD4
2 000D
2 0392
4 2 -16 00009783
4 2 -10 000DF45E
4 000105B5
4 2 -10 FF90F5C2
2 0000
1 24
1 28
1 27
1 27
1 23
1 27
1 24
1 24
1 27
1 29
1 05
1 00000007
2 0013
2 003F
16
to convert to Hz.
Each SiRF binary message is defined based on the ID.
Receiver channel where data was measured (range 1-12).
PRN number of the satellite on current channel.
Current channel tracking state (see Table 45)
Number of GPS bits transmitted since Sat-Sun midnight (in Greenwich)
at a 50 bps rate.
Number of milliseconds of elapsed time since the last received bit(20
ms between bits)
Current C/A code symbol being transmitted (range 0 to 1023
chips;1023 chips=1 ms).
Fractional chip of the C/A code symbol at the time of sampling(scaled
-16
by 2 ,=1/65536)
The current value of the carrier frequency as maintained by the
tracking loops.
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.
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.
This is the number of times the tracking software has completed full
satellite signal searche.s
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.
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).
Bit
Ms
Chip
Chip
Rad/2ms
Ms
Cycles
dBHz
dBHz
dBHz
dBHz
dBHz
dBHz
dBHz
dBHz
dBHz
dBHz
Ms
36
15342548
13
914
/2 -16 38787
/2 -10 914526
66997
/2 -10 -7277118
0
36
40
39
39
35
39
36
36
39
41
5
7
19
63