DiscFix Application

Definition

DiscFix reads a RINEX observation data file containing GPS dual-frequency pseudorange and carrier phase measurements, divides the data into 'satellite passes', and finds and fixes discontinuities in the phases for each pass. Output is a list of editing commands for use with program RinexEdit. DiscFix will (optionally) write the corrected pseudorange and phase data to a new RINEX observation file. Other options will also smooth the pseudorange and/or debias the corrected phase.

Command Summary

Required Arguments:

Short Arg.	Long Arg.	Description
	--inputdir	File containing more options.
	--dt	Time space in seconds of the data.

Optional Arguments:

Short Arg.	Long Arg.	Description
-f	--file	File containing more options.
	--beginTime	Start time of processing (BOF).
	--endTime	End time of processing (EOF).
	--deciminate	Decimate data to specified time interval, in seconds.
	--forceCA	Use C/A code range, NOT P code. Default only if P absent.
	--gap	Minimum data gap in seconds separating satellite passes (default 600).
	--onlySat	Process only satellite (GPS SatID, e.g. G21).
	--exSat	Exclude satellite(s) (GPSSatID).
	--smoothPR	Smooth pseudorange and output in place of raw pseudorange.
	--smooth	Same as =--smoothPR AND --smoothPH.
	--DCLabel	Set Discontinuity Corrector parameter 'label to 'value'.
	--DChelp	Print a list of GDC parameters and their defaults, then quit.
	--logOut	Output log file name (df.log).
	--cmdOut	Output file name, for editing commands (df.out).
	--format	Output tiem format (gpstk::CommonTime) (%4F %10.3g).
	--RinexFile	RINEX (observation) file name for output of corrected data.
	--RunBy	RINEX header 'Run By' string for output.
	--Observer	RINEX header 'Observer' string for output.
	--Agency	RINEX header 'Agency' string for output.
	--Marker	RINEX header 'Marker' string for output.
	--Number	RINEX header 'Number' string for output.
-h	--help	Print this syntax page and quit.
	--verbose	Print extended output to the log file.

Platforms Supported

This application has been succesfully used in Linux and Windows.

This application successfully build under these environments: linux-x86, linux-x86_64, solaris-ppc, Windows/.net2005, MacOS/X-Code.

Usage Examples

Linux/UNIX command line

Example use session from the GPSTk source distribution.

1. Change to the examples directory. cd ~/svn/gpstk/dev/examples
2. Execute DiscFix. Here are the standard recommended DiscFix^? options.

        DiscFix --inputfile YOUR_RINEX_FILE --dt 30 --smooth --DCWLFixMaxGap=3000 --DCGFFixMaxGap=250 --DCGFFixSigma=3.6 --RinexFile YOUR_OUTPUT_RINEX_FILE

See also:

• EditRinex - generating extended RINEX observation files