Bernese GPS Software Version 5.0 - Bernese GNSS Software

17. Data Simulation Tool GPSSIM
Research oriented analyses: Simulated data is well suited to carry out various research related
analyses. The main advantage of the simulated data in this regard is that “the truth”
(e.g., satellite and station positions, ambiguities) is known to the user. Topics of
interest may cover cycle slip detection and repair, use of GNSS orbits of different
quality, ambiguity resolution strategies for very long baselines, etc.
Preprocessing is not in the focus of interest if the simulated data set is used for pre-analysis
purposes. With simulated observations from GPSSIM, preprocessing may be skipped because
the program includes the correct receiver clock corrections and ambiguity parameters in the
observation files. If no cycle slips were set up during the generation process the resulting
data can be considered as successfully cleaned, with synchronized receiver clocks and fixed
ambiguities.
If a double-difference analysis is intended, the only preparatory step is baseline creation with
SNGDIF. The program preserves the receiver clock and ambiguity information to produce
“ready-to-use” single-difference files. This is, of course, not necessary in case of a zerodifference
approach. Now the data can directly be introduced in the parameter estimation
program GPSEST without further ado.
It goes without saying that the simulated data can be processed with the variety of all
Bernese GPS Software programs, not only GPSEST.
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