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MiLLennium GPSCard SW Version 4.503/4.52 Command Descriptions Manual Rev 2 261
Notes on Table D-5:
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.
Table D-6 Range Record Format (RGED only)
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, i.e. 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
Round to the closest integer
IF (ADR_ROLLS ≤ -0.5)
ADR_ROLLS = ADR_ROLLS - 0.5
ELSE
ADR_ROLLS = ADR_ROLLS + 0.5
At this point integerise ADR_ROLLS
CORRECTED_ADR = RGED_ADR - (MAX_VALUE * ADR_ROLLS)
where:
ADR has units of cycles
WAVELENGTH = 0.1902936727984 for L1
WAVELENGTH = 0.2442102134246 for L2
MAX_VALUE = 8388608
Data Bit(s) from first to last Length (bits) Format Scale Factor
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 see Table D-7, Page 203