Bernese GPS Software Version 5.0 - Bernese GNSS Software

20.4.4.3 Extract Broadcast Clocks from Navigation Files
20.4 Description of the Processing Examples
Starting point for the clock estimation in this example are the satellite broadcast clocks. In
order to use them within Bernese they have to be extracted from the RINEX navigation
files. In addition the broadcast information must pass some initial tests. These steps are
integrated in this PCF part.
#
# Extract broadcast clocks from navigation files
# ----------------------------------------------
151 CCRINEXN CLK_GEN ANY 1 001
152 RXNBV3 CLK_GEN ANY 1 151
153 BRDTST CLK_GEN ANY 1 152
154 SATCLK CLK_GEN ANY 1 153
PID 151 CCRINEXN: The available RINEX navigation files from the different stations (ORX
directory) are merged and concatenated to one file (RAW directory).
PID 152 RXNBV3: The merged RINEX navigation file is converted into Bernese broadcast
message format.
PID 153 BRDTST: The broadcast information is checked for plausibility by program
BRDTST.
PID 154 SATCLK: The broadcast clocks are extracted from the broadcast messages file and
stored in a Bernese satellite clock file.
Because GPS allows no direct access to any timescale only differences between the estimated
clock corrections (e.g., with respect to a reference clock) can be interpreted. Nevertheless,
all receiver clocks (including the reference clock) have to be synchronized to GPS broadcast
time. This can be realized by using satellite broadcast clocks as basis for the estimation of
receiver clock corrections. Alternatively, you may extract the satellite clocks from the IGS
precise file using a polynomial representation (program PRETAB in PID 111).
Further reading: Section 4.2: RINEX Observation Files (page 53), Section 4.3: RINEX
Navigation Files (page 65), Chapter 5: Preparation of Earth Orientation, GNSS Orbit,
and Satellite Clock Information (page 83), Section 5.3: Preparation of GNSS Broadcast
Information (page 87), Section 5.5: Preparation of Satellite Clock Corrections (page 98).
20.4.4.4 Preprocess, Convert, and Synchronize Observation Data
This part of the PCF prepares the observation data. An ASCII-graphic of observations is
created and a first data screening based on RINEX level is performed. After converting
RINEX files to Bernese format, receiver clocks are synchronized.
Bernese GPS Software Version 5.0 Page 451