Bernese GPS Software Version 5.0 - Bernese GNSS Software

6.4 Forming Baselines
Furthermore the CODXTR summary output shows one line for each station–satellite combination
where more than 50 epochs are considered as outliers or marked for any other reason.
The first two numbers of these lines reflect the internal CODSPP numbering and are not
important. Station name, outlier identification, and satellite PRN number follow. The outlier
identification is most commonly OUT. Other possible entries are listed in Section 6.3.2.
The line terminates with the start and end epochs of the outlier interval and the number of
observations in this interval.
2 1 ALBH 40129M003 OUT 31 03-12-05 06:47:00 03-12-05 10:18:00 423
7 1 ALBH 40129M003 OUT 31 03-12-05 16:00:00 03-12-05 16:59:30 120
9 2 ALGO 40104M002 OUT 31 03-12-05 15:30:30 03-12-05 15:58:30 57
10 3 ALIC 50137M001 OUT 31 03-12-05 01:26:00 03-12-05 05:02:00 433
11 3 ALIC 50137M001 OUT 31 03-12-05 05:07:30 03-12-05 05:54:30 95
103 4 AMC2 40472S004 OUT 31 03-12-05 07:27:00 03-12-05 10:03:00 313
108 4 AMC2 40472S004 OUT 31 03-12-05 15:13:00 03-12-05 16:59:30 214
.....
116 8 ZAMB 34601M001 OUT 31 03-12-05 00:00:00 03-12-05 03:14:30 390
117 8 ZAMB 34601M001 OUT 31 03-12-05 03:21:00 03-12-05 04:00:00 79
### SATELLITE REPOSITIONING OR CLOCK RESET DETECTED!
# SATELLITES : 1
SATELLITE NUMBER: 31
If the same station is listed for many satellites, something is probably wrong with its data.
If the same satellite is listed for many stations there is something wrong with the satellite.
In the above example satellite 31 was marked for many sites. As the marked time intervals
are distributed over the day and do not concentrate towards the end of the day the outliers
are not caused by a maneuver. In fact, on this particular day satellite 31 was scheduled
for maintenance. Usually the satellite clock is reset in such cases. The outlier detection of
CODSPP handles such problems and no action is required by the program user.
If such an event is detected the clock values for the corresponding satellite may be removed
from the satellite clock file containing, e.g., broadcast clock. This action is reported in the
summary by the line:
1 SATELLITE(S) REMOVED FROM BROADCAST CLOCK FILE.
SATELLITE NUMBER(S): 31
6.4 Forming Baselines (SNGDIF)
The Bernese GPS Software uses double-differences as basic observables. The singledifferences
(between receivers, see Section 2.3.4) are stored in files, the double-differences are
created in program GPSEST. Program SNGDIF (”Menu>Processing>Baseline file creation”) creates
the single-differences and stores them in files. The program may create single-differences
for both, phase and code measurements. Usually, only the phase single-differences are used
for further computations. An important exception is the ambiguity resolution using the
Melbourne-Wübbena linear combination. In that case the code single-differences have to be
formed, too.
Bernese GPS Software Version 5.0 Page 113