F42 - Pseudorange, Carrier Phase And Range Rate (Raw) - Mitel GPS Orion-S/-HD Receiver User Manual

Document Title:
User's Manual for the GPS Orion-S/-HD Receiver
4.4.1.8 F42 – Pseudorange, Carrier Phase and Range Rate (Raw)
Complementary to the smoothed measurements given in the F41 message, the F42 mes-
sage provide the unprocessed, raw pseudorange, carrier phase and range rate (Doppler)
measurements for the 12 tracking channels. All measurements are given in metric units (i.e.
[m], [m/s]).
MsgID Chars. Format
F42 505
1 x
3 xxx
4 xxxx
12 xxxxxx.xxxxx
2 xx
12 xx.xxxxxxxxx
2 xx
13 xxxxxxxxxx.xx
14 sxxxxxxxxxx.xx
9 sxxxxx.xx
1 x
2 xx
1 x
Notes:
The time tag of the measurements is identical to that of the associated navigation
data message. It is referred to a model clock that is continuously adjusted to GPS
time as part of the navigation solution. In an S/A free environment, this model clock
usually deviates by no more than 30 (0.1 s) from the true GPS time.
Representative accuracies amount to 0.4 m (pseudodrange), 0.7 mm (carrier phase)
and 8 cm/s (Doppler based range rate) for the Orion-S receiver. The HD version ex-
hibits a higher noise of the code (ca. 1 m), carrier phase (ca. 1.5 mm) and Doppler
measurements (ca. 30 cm/s) due to the relaxed loop bandwidths.
Measurements are nominally collected once full frame lock has been achieved on the
tracking channel. In addition, measurements can already be provided in carrier lock if
a valid navigation solution is available to perform the required synchronization of raw
correlator readings. To prevent bad measurements from entering the navigation solu-
tion, measurements are only tagged valid from 10 s after frame lock onwards in the
Orion-S receiver.
Example:
<STX>F421139172840.0000013 0.071561082 3
23960883.83 +105549.919 +2365.530 6
2493872.10 -380366.985 -4080.44121
61450.35 -333623.542 -6709.47123
025.64-111954989.319 +5637.95029
7.48 -162108.043 -1689.34115
19-113949616.991 -1146.1614A<ETX>
Document No.
GTN-MAN-0110
DLR/GSOCNo part of this document shall be reproduced in any form or disclosed to third parties without prior authorization.
Description
Pseudorange, carrier phase and range rate (raw)
<STX>
Message Id (=F42)
GPS week
GPS seconds of week [s] (GPS time of observ. using current clock model)
GPS-UTC [s]
Clock offset [s]
Repeated for each of 12 channels
PRN
Pseudorange [m] (unsmoothed)
Integrated carrier-phase [m]
Range rate [m/s]
Validity flag
Checksum
<ETX>
24651987.05
22747854.11-111711119.850 +7410.090 9
24261196.28
23713839.06-113242044.709 -4595.36125
22797343.88-112616306.585
20050705.60-114318812.585 -3365.58117
-307413.396 -3259.220 5
-628217.740 -6951.55118
+926.33114
19685814.
35
2
228
23786
2158937
Issue 1.0
June 22, 2003