-BNC allows to compare the contents of two files containing GNSS orbit and clock data in SP3 format. Such SP3 ASCII file basically contains a list of records over a certain period of time. Each record carries a time tag, the X,Y,Z position of the satellite's Center of Mass at that time and the corresponding satellite clock value. Both SP3 files may contain some records for different epochs. If so BNC only compares records for identical epochs. BNC accepts that a specific GNSS system or a specific satellite is only available in one of the SP3 files. Note that BNC does not carry out orbit interpolations when comparing SP3 files. -
--To compare satellite clocks provided by the two files BNC first converts coordinate differences dX,dY,dZ into along track, out-of-plane and radial compoments. It then corrects the clock differences for the radial components of the coordinate differences. RMS values of clock differences are finally calculated after introducing an offset 'per epoch for all satellites' plus an offset 'per satellite for all epochs'. +BNC allows to compare the contents of two files containing GNSS orbit and clock data in SP3 format. SP3 ASCII files basically contains a list of records over a certain period of time. Each record carries a time tag, the X,Y,Z position of the satellite's Center of Mass at that time and the corresponding satellite clock value. Both SP3 files may contain some records for different epochs. If so then BNC only compares records for identical epochs. BNC accepts that a specific GNSS system or a specific satellite is only available in one of the SP3 files. Note that BNC does not interpolate orbits when comparing SP3 files. +
++To compare satellite clocks provided by the two files BNC first converts coordinate differences dX,dY,dZ into along track, out-of-plane and radial compoments. It then corrects the clock differences for the radial components of the coordinate differences. RMS values of clock differences are finally calculated after introducing at first one offset 'per epoch for all satellites' plus a second offset 'per satellite for all epochs'.
@@ -967,5 +967,5 @@| 'MJD' | Modified Julian Date |
| 'PRN' | System specification and satellite PRN |
| 'radial' | Radial component of orbit coordinate difference |
| 'along' | Along track component of orbit coordinate difference |
| 'out' | Out-of-plane component of orbit coordinate difference |
| 'clk' | Clock difference |
| 'clkRed' | Clock difference reduced by radial component of orbit coordinate difference |
| 'PRN' | Satellit specification |
| 'radial' | Radial component of orbit coordinate difference [m] |
| 'along' | Along track component of orbit coordinate difference [m] |
| 'out' | Out-of-plane component of orbit coordinate difference [m] |
| 'clk' | Clock difference [m] |
| 'clkRed' | Clock difference reduced by radial component of orbit coordinate difference [m] |
| 'iPRN' | BNC internal sequence number |
-The second part following string 'RMS[m]' provides a summary of the comparison using the following abbreviations: +The second part following string 'RMS' provides a summary of the comparison using the following abbreviations:
| 'PRN' | System specification and satellite PRN |
| 'radial' | RMS of radial component of orbit coordinate differences |
| 'along' | RMS of along track component of orbit coordinate differences |
| 'out' | RMS of out-of-plane component of orbit coordinate differences |
| 'PRN' | Satellite specification |
| 'radial' | RMS of radial component of orbit coordinate differences [m] |
| 'along' | RMS of along track component of orbit coordinate differences [m] |
| 'out' | RMS of out-of-plane component of orbit coordinate differences [m] |
| 'nOrb' | Number of epochs used in in orbit comparision |
| 'clk' | RMS of clock differences |
| 'clkRed' | RMS of clock differences after reduction of radial orbit differences |
| 'clk' | RMS of clock differences [m] |
| 'clkRed' | RMS of clock differences after reduction of radial orbit differences [m] |
| 'nClk' | Number of epochs use in clock comparisons |
| 'Offset' | Clock offsets |
| 'Offset' | Clock offset [m] |