Bernese GPS Software Version 5.0 - Bernese GNSS Software

Example 2
6.5 Preprocessing Phase Observations
The second example is based on the very short baseline (only 14 meters) between the two
stations in Zimmerwald (ZIMJ−ZIMM) available in the example campaign (see Chapter 20).
We used the strategy BOTH in this case. All other options are identical to those in Example 1
with one exception: “Maximum ionospheric change from epoch to epoch” in panel “MAUPRP 8:
Cycle Slip Detection/Correction” was set to 30%. The strategy BOTH should not be used for
baselines longer than about 10 km. However, this strategy may be superior to the COM-
BINED strategy if the baseline is very short and the receiver is of poor quality and provides
measurements with a high noise level (not the case in this example). The output from the
program is similar to that of Example 1. The only difference is the cycle slip detection flag
used: here it is SNG (instead of DUA in Example 1).
------------------------------------------------------------------------
CYCLE SLIPS ACCEPTED IN THIS RUN
------------------------------------------------------------------------
NUMBER OF SLIPS IN L1: 70
NUMBER OF SLIPS IN L2: 124
NUMB TYP N EPOCH SAT FRQ WLF SLIP FRAC RES.L3 IONOS
(M) (M)
------------------------------------------------------------------------
1 CLK * 18 ALL 1 1 51988847.
2 CLK * 18 ALL 2 1 40510790.
3 SNG * 51 18 2 1 -8442034. 0.12
4 SNG * 87 18 2 1 52. 0.08
5 SNG * 87 14 2 1 4106575. 0.06
You may compare the correction for cycle slip 3 (second frequency for satellite 18 at
epoch 51) in the second example with the correction for the corresponding cycle slip in
the first example. It is the same event that can be attributed to the data of the station Zimmerwald
(ZIMM) that was used in both baselines. The small difference in the correction for
the clock jump between the two examples does not matter because finally double-differences
of the observations without access to the clock parameters are analyzed.
Example 3
The third example demonstrates the program output of MAUPRP for screening zerodifference
files. Again the station Zimmerwald (ZIMM) is used. A satellite clock file produced
by the program CLKEST was introduced. To preprocess zero-difference observation files we
have to use the COMBINED mode. The option “Do not accept cycle slip corrections” is marked
and the “Maximum ionospheric change from epoch to epoch” is 400% (see panel “MAUPRP 8: Cycle
Slip Detection/Correction”).
As mentioned in Section 6.5.3 the change of the receiver clock correction is estimated epochwise
before the residuals for the cycle slip detection are computed (Eqns. (6.4)). The program
output contains a summary of these epoch solutions:
Bernese GPS Software Version 5.0 Page 127