ashtech DG14, Reference Manual

Page: 211 / 390

Raw Data Commands 191
Raw Dat
a Commands
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 Checksum>
Table 7.4 outlines the data string format.
Table 7.4. $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...14)
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 pseudo-range measurement, derived from raw
range data and smoothing as defined in the MCA message
char [chn2] 1 Channel (1...14)
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 pseudo-range measurement, derived from raw
range data and smoothing as defined in the MCA message
char [chn3] 1 Channel (1...14)
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 pseudo-range measurement, derived from raw
range data and smoothing as defined in the MCA message
char [chn4] 1 Channel (1...14)
char [prn4] 1 Satellite PRN number