Setdiffcodebiases Sets Satellite Differential Code Biases - Novatel GPStation-6 User Manual

Commands
4.2.8

SETDIFFCODEBIASES Sets satellite differential code biases

The GPStation-6 measures TEC by differencing pseudo range measurements between frequencies.
The code phase between different signals can have a bias as broadcast by the satellites. These biases
typically vary by satellite and can change over time as satellites age or new satellites are introduced to
replace older ones. This bias will cause a bias in the TEC output values.
Use this command to enter the magnitude of these biases per PRN, in nanoseconds. These values are
then used in the TEC calculations to remove the bias.
The biases are calculated by the International GNSS Service (IGS). Calculation details, analysis, and
results are available at http://aiuws.unibe.ch/spec/dcb.php. The most recent 30 day average bias
values can be downloaded from http://aiuws.unibe.ch/ionosphere/p1c1.dcb.
Abbreviated ASCII Syntax:
SETDIFFCODEBIASES bias_type biases
Input Example:
setdiffcodebiases gps_c1p1 -0.542 -0.069 -0.597 1.030 -1.289
0.089 -1.878 -0.686 0.044 -1.982 0.528 1.285 1.405 0.029
1.696 -0.838 1.237 -0.514 -2.094 -1.482 -0.543 0.473 0.629
-0.343 0.337 0.911 -0.498 -0.440 1.783 1.808 1.542 -1.031
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Field Field Type
1 SETDIFFCODE
BIASES Header
2 Code Pair
3 Biases
GPStation-6 User Manual Rev 2
ASCII Binary
Value Value
- -
GPS_C1P1 0
GPS_C2P2 1
Binary
Description
Format
This field contains -
the command
name or the
message header
depending on
whether the
command is
abbreviated
ASCII, ASCII or
binary,
respectively.
Selects the code
ENUM
phase pair
Pseudo range Fixed
code phase Float
biases Array[40]
Message ID: 687
Binary Binary
Bytes Offset
H 0
4 H
160 H+4
56