119
Commands
$PASHR,CT2
This message is not output unless the receiver is tracking at least one satellite. The
CT2 message contains an adjusted receive time (the time at which the data was
received) with satellite PRN numbers and channel assignments in association with
full carrier phase measurements and smoothed pseudoranges. This message
contains data for a maximum of four satellites. If the receiver is tracking eight
satellites, two CT2 messages are output. If the receiver is tracking more than eight
satellites, three CT2 messages are output. The message is output in the format:
$PASHR,CT2,<Format 2 Data String + Checksum>
Table 4.57 defines the data string format.
Table 4.57. $PASHR,CT2 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
CT2 message can contain data for a maximum of four satellites, if the
receiver is tracking eight satellites, four 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
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
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
char [chn4] 1 Channel (1...12)
char [prn4] 1 Satellite PRN number
G12RevD.book Page 119 Tuesday, April 2, 2002 4:33 PM
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