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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

÷

4

π

)

÷

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).