121
Commands
Table 4.58 defines the data string format.
Table 4.58. $PASHR,CT3 Data String
Binary Type Bytes Content
Long [adj_rcvtime] 4 The time at which the data was received, based on the following formula
using the rcvtime and navt values from the PBN message: adj_rcvtime =
rcvtime - navt/speed of light
char [sv_no] 1 The number of satellites in the message (1...4).
char [remainder] 1 The number of satellites remaining for the current epoch; i.e., since the
CT3 message can contain data for a maximum of three satellites, if the
receiver is tracking six satellites, three are remaining
char [chn1] 1 Channel (1...12)
char [prn1] 1 Satellite PRN number
double [full_phase1] 8 Full carrier measurements in cycles as defined in the MCA message
double
[smooth_rng1]
8 Smoothed pseudorange measurement, derived from raw range data and
smoothing as defined in the MCA message
long [doppler1] 4 Doppler measurement as defined in the MCA message
char [chn2] 1 Channel (1...12)
char [prn2] 1 Satellite PRN number
double [full_phase2] 8 Full carrier measurements in cycles as defined in the MCA message
double
[smooth_rng2]
8 Smoothed pseudorange measurement, derived from raw range data and
smoothing as defined in the MCA message
long [doppler2] 4 Doppler measurement as defined in the MCA message
char [chn3] 1 Channel (1...12)
char [prn3] 1 Satellite PRN number
double [full_phase3] 8 Full carrier measurements in cycles (as defined in the MCA message)
double
[smooth_rng3]
8 Smoothed pseudorange measurement, derived from raw range data and
smoothing as defined in the MCA message
long [doppler3] 4
Satellite doppler measurement (10
-4
Hz) as defined in the MCA message
short [checksum] 2 The checksum is calculated by breaking the structure into shorts, adding
them together, and taking the least significant 16 bits of the result
Total bytes: 22*number of satellites in the message + 8 (74 for 3 satellites)
G12RevD.book Page 121 Tuesday, April 2, 2002 4:33 PM
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