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 MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1

1. Bit 3: On OEM GPSCards, “ROM” includes all forms of non-volatile memory. 

2. Bits 12-15: Flag is reset to 0 five minutes after the last overrun/overload condition has occurred.

Notes on Table D-6: 

1A

Only PRNs 1 - 63 are reported correctly (Note: while there are only 32 PRNs in the basic GPS scheme,

situations exist which require the use of additional PRNs)

1B

The prn offsets for WAAS have been mapped to the same range as GPS, ie. 1 - 19, while the prn offsets
for GLONASS are 1 - 29.

2

C/No is constrained to a value between 20 - 51 dB-Hz. Thus, if it is reported that C/No = 20 dB-Hz, the

actual value could be less. Likewise, if it is reported that C/No = 51 dB-Hz, the true value could be greater.

3

Lock time rolls over after 2,097,151 seconds.

4

ADR (Accumulated Doppler Range) is calculated as follows:

ADR_ROLLS = ( -RGED_PSR / WAVELENGTH  - RGED_ADR) / MAX_VALUE

IF (ADR_ROLLS 

≤ 

-0.5)

ADR_ROLLS = ADR_ROLLS - 0.5

ELSE

ADR_ROLLS = ADR_ROLLS + 0.5 

CORRECTED_ADR = RGED_ADR + (MAX_VALUE * ADR_ROLLS)

ADR has units of cycles
WAVELENGTH = 0.1902936727984 for L1
WAVELENGTH = 0.2442102134246 for L2
MAX_VALUE = 8388608

PRN  

1A, 1B

0..5

6

integer

1

C/No

 

2

6..10

5

integer

(20+n) dB-Hz

Lock time

 

3

11.31

21

integer

1/32 s

ADR  

4

 

32..63

32

integer 2’s comp.

1/256 cycles

Doppler frequency

68..95

28

integer 2’s comp.

1/256 Hz

Pseudorange

 

64..67 msn; 96..127 lsw

36

integer 2’s comp.

1/128 m

StdDev - ADR

 

128..131

4

integer 

(n+1) / 512  cyc

StdDev - pseudorange

132..135

4

see 

5

Channel Tracking status 

6

136..159

24

integer