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Copernicus GPS Receiver 153
TRIMBLE STANDARD INTERFACE PROTOCOL (TSIP) A
The receiver codephase is expressed in 1/16th of a C/A code chip. This corresponds
to:
1/16 x C/A code chip = 977.517ns/16 = 61.0948 ns
= 61.0948 x speed of light, m/s
= 18.3158 meter
Note – The receiver occasionally adjusts its clock to maintain time accuracy within 1
msec. At this time, all pseudo-range values for all satellites are adjusted upward or
downward by one millisecond. Report packet 0x5A checks packet 0x83 or 0x84 for
clock bias.
Report Packet 0x5F
For Trimble diagnostic use only, please ignore.
Report Packet 0x5C - Satellite Tracking Status
This packet provides tracking status data for a specified satellite. Some of the
information is very implementation-dependent and is provided mainly for diagnostic
purposes. The receiver sends this packet in response to Packet
0x3C. The data format
is shown below.
Table A.46 Report Packet 0x5C Data Formats
Byte Bit Item Type Value Definition
0 Satellite
PRN
number
UINT8 number
1 - 32
1 0-2 reserved Bits reserved
1 3-7 Channel Bits 0-11
2 Acquisition
flag
UINT8 0
1
2
Never acquired
Tracking
Re-opened search
3 Ephemeris
flag
UINT8 0
1
Flag not set
Ephemeris is decoded
4-7 Signal
level
Single Same as in Packet 0x47
8-11 GPS time
of last
measurem
ent
Single <0
>0
No measurements have been taken.
Center of the last measurement
taken from this satellite.
12-15 Elevation Singles radians Approximate elevation of this
satellite above the horizon.
Updated about every 15 sec.s. Used
for searching and computing
measurement correction factors.