Download DATcomp.PLX (11 Kb)
Requires Perl Support package.
PERL -W DatComp <Truth Viewdat> <Compare ViewDat> [Elevation Mask]
DatComp compares two ViewDAT (ViewDAT -D17 -X) output files that should be identical and makes sure they are. This is most useful when you are testing other systems that are creating DAT files. Normally for truth a DAT file downloaded from the receiver is used, but any trusted source can be used.
- Phase and Range Measurements
- Clock Offsets
- Slip indications
- SV’s in both files
- Code type indications
- Missed Epochs
The system works around the know differences that are expected between DAT files.
- Slightly different clock values, RINEX files have the clock calculated during the conversion to DAT. This calculation is not the same as in the reciever.
- Phase and Range differences, the Phase and Range measurements in the DAT file from a receiever with file compression is different than that of the RT-17 data. RT-17’s are not compressed, the compression system is uses less resolution (which is more than enough for all applications) which causes differences.
- Elevation and Azimuth differences, there is upto 2 degrees of difference is allowed. While this is a lot, all applications that do tropo modeling have to calc the elevation angle as a degree resolution for elevation angle is not suitable for the most precise tropo modeling.