Bernese GPS Software Version 5.0 - Bernese GNSS Software

7. Parameter Estimation
The RINEX meteo files written by QLRINEXO contain measured meteo information. They
may be converted to Bernese meteo files using program RXMBV3 (see Section 4.10). The
meteo information is required by program GPSEST in order to compute the signal delay due
to tropospheric refraction using the Marini-Murray refraction model [Marini and Murray,
1973].
Processing SLR Data
Program GPSEST may process SLR data from any satellite. The satellite has to be listed in
the satellite information file (see Section 22.4.5). This file contains also the SLR retroreflector
offset, the distance vector between the satellite’s center of mass and the center of reflection
of the retroreflector array carried by the satellite. The SATELLITE NAME has to start with
SLR REFL to distinguish between the sensor offset of a SLR reflector and the antenna phase
center of a microwave transmitter at one and the same satellite. We refer to Section 16.2.2
for more details.
SLR observation are introduced into GPSEST as code zero-difference observation files. In
order to process all SLR data the sampling interval has to be set to blank (panel “GPSEST 3.1:
General Options 1”). Select ALL for “Satellite system”, L1 for “Frequency”, and disable “Elevationdependent
weighting” in the same panel. Tropospheric refraction at optical frequencies is
handled by the model by [Marini and Murray, 1973] (MARINI-MUR for “ZPD model and
mapping function” in panel “GPSEST 3.2: General Options 2”). Specify the Bernese meteo files
containing the measured meteo values for the SLR stations in option “Meteorological data” in
panel “GPSEST 1.2: Input Files 2”. Do not estimate troposphere parameters. In Version 5.0
of the Bernese GPS Software no SLR-specific parameters such as range or time biases are
available.
Outlier rejection can be done directly in GPSEST using option “Maximum tolerated O-C term”
in panel “GPSEST 3.2: General Options 2” or by residual screening using programs RESRMS
and SATMRK (see Section 6.6).
In Version 5.0 only one Laser frequency may be processed. This frequency is hardwired in
subroutine ${LG}/TROPOS.f to 532 nm (Neodym-Yag) for all stations except Zimmerwald
(Station ID 7810) for which 423 nm is used (Titanium-Sapphire) to compute the refraction
correction. This causes problems for stations with other Laser frequencies, and in particular
when processing two frequency data. In a future version of the Bernese GPS Software this
issue will be addressed.
7.8 Program Output and Extraction Program
7.8.1 The Program Output
The program output of GPSEST includes all necessary information to document a run of
the program. This includes a list of the names of all input and output files, an echo of the
important user options, statistical information on observations and parameters, as well as
detailed results in an easy readable form.
The output is divided into 14 sections where the first 12 refer to the input data and a priori
information. This first part includes (no complete list):
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