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trunk/BNC/src/bnchelp.html
r6594 r6613 948 948 <p><a name="sp3comp"><h4>3.7. SP3 Comparison</h4></p> 949 949 <p> 950 BNC allows to compare the contents of two files containing GNSS orbit and clock data in SP3 format. S uch 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.951 </p> 952 <p> 953 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 a n offset 'per epoch for all satellites' plus anoffset 'per satellite for all epochs'.950 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. 951 </p> 952 <p> 953 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'. 954 954 </p> 955 955 … … 967 967 <li>R (excluding all GLONASS satellites)</li> 968 968 <li>R12,R24 (excluding GLONASS satellites with slot number 12 and 24)</li> 969 <li>G04,G31,R (excluding GPS satellites with PRN 31 and 4as well as all GLONASS satellites)</li>969 <li>G04,G31,R (excluding GPS satellites with PRN 4 and 31 as well as all GLONASS satellites)</li> 970 970 </ul> 971 971 </p> … … 983 983 <table> 984 984 <tr><td>'MJD' </td><td>Modified Julian Date</td></tr> 985 <tr><td>'PRN' </td><td>S ystem specification and satellite PRN</td></tr>986 <tr><td>'radial' </td><td>Radial component of orbit coordinate difference </td></tr>987 <tr><td>'along' </td><td>Along track component of orbit coordinate difference </td></tr>988 <tr><td>'out' </td><td>Out-of-plane component of orbit coordinate difference </td></tr>989 <tr><td>'clk' </td><td>Clock difference </td></tr>990 <tr><td>'clkRed' </td><td>Clock difference reduced by radial component of orbit coordinate difference </td></tr>985 <tr><td>'PRN' </td><td>Satellit specification</td></tr> 986 <tr><td>'radial' </td><td>Radial component of orbit coordinate difference [m]</td></tr> 987 <tr><td>'along' </td><td>Along track component of orbit coordinate difference [m]</td></tr> 988 <tr><td>'out' </td><td>Out-of-plane component of orbit coordinate difference [m]</td></tr> 989 <tr><td>'clk' </td><td>Clock difference [m]</td></tr> 990 <tr><td>'clkRed' </td><td>Clock difference reduced by radial component of orbit coordinate difference [m]</td></tr> 991 991 <tr><td>'iPRN' </td><td>BNC internal sequence number</td></tr> 992 992 </table> 993 993 <p> 994 The second part following string 'RMS [m]' provides a summary of the comparison using the following abbreviations:994 The second part following string 'RMS' provides a summary of the comparison using the following abbreviations: 995 995 </p> 996 996 <table> 997 <tr><td>'PRN' </td><td>S ystem specification and satellite PRN</td></tr>998 <tr><td>'radial' </td><td>RMS of radial component of orbit coordinate differences </td></tr>999 <tr><td>'along' </td><td>RMS of along track component of orbit coordinate differences </td></tr>1000 <tr><td>'out' </td><td>RMS of out-of-plane component of orbit coordinate differences </td></tr>997 <tr><td>'PRN' </td><td>Satellite specification</td></tr> 998 <tr><td>'radial' </td><td>RMS of radial component of orbit coordinate differences [m]</td></tr> 999 <tr><td>'along' </td><td>RMS of along track component of orbit coordinate differences [m]</td></tr> 1000 <tr><td>'out' </td><td>RMS of out-of-plane component of orbit coordinate differences [m]</td></tr> 1001 1001 <tr><td>'nOrb' </td><td>Number of epochs used in in orbit comparision</td></tr> 1002 <tr><td>'clk' </td><td>RMS of clock differences </td></tr>1003 <tr><td>'clkRed' </td><td>RMS of clock differences after reduction of radial orbit differences </td></tr>1002 <tr><td>'clk' </td><td>RMS of clock differences [m]</td></tr> 1003 <tr><td>'clkRed' </td><td>RMS of clock differences after reduction of radial orbit differences [m]</td></tr> 1004 1004 <tr><td>'nClk' </td><td>Number of epochs use in clock comparisons</td></tr> 1005 <tr><td>'Offset' </td><td>Clock offset s</td></tr>1005 <tr><td>'Offset' </td><td>Clock offset [m]</td></tr> 1006 1006 </table> 1007 1007 … … 1028 1028 ! RMS[m] 1029 1029 ! 1030 ! MJDPRN radial along out nOrb clk clkRed nClk Offset1031 ! --------------------------------------------------------------------- --------1032 ! 1033 ! 1034 ! 1035 ! 1036 ! 1037 ! 1038 ! 1039 ! 1040 ... 1041 ... 1042 ... 1043 ! 1044 ! 1045 ! 1046 ! 1047 ! 1030 ! PRN radial along out nOrb clk clkRed nClk Offset 1031 ! --------------------------------------------------------------------- 1032 ! G01 0.0151 0.0377 0.0196 96 0.0157 0.0154 96 0.0152 1033 ! G02 0.0083 0.0278 0.0228 96 0.0097 0.0124 96 -0.0626 1034 ! G03 0.0105 0.0311 0.0307 96 0.0352 0.0309 96 0.0898 1035 ! G04 0.0113 0.0334 0.0154 94 0.0725 0.0707 94 -0.5087 1036 ! G05 0.0103 0.0319 0.0299 96 0.0417 0.0403 96 0.1185 1037 ! G06 0.0182 0.0509 0.0302 96 0.0218 0.0166 96 0.0040 1038 ! G07 0.0337 0.1632 0.0463 96 0.0483 0.0435 96 0.3031 1039 ! G08 0.0228 0.0741 0.0321 88 0.0616 0.0561 88 -0.2232 1040 ... 1041 ... 1042 ... 1043 ! R20 0.0637 0.2115 0.1131 96 0.1580 0.1345 96 0.7371 1044 ! R21 0.0475 0.1657 0.0880 96 0.1123 0.0840 96 -0.4133 1045 ! R22 0.0125 0.1249 0.0646 96 0.0414 0.0444 96 -0.7375 1046 ! R23 0.0435 0.1503 0.0573 96 0.0987 0.1099 96 0.6620 1047 ! R24 0.0278 0.2026 0.1186 96 0.1446 0.1303 96 -1.1470 1048 1048 ! 1049 ! 1049 ! Total 0.0262 0.0938 0.0492 5268 0.0620 0.0561 5268 1050 1050 </pre> 1051 1051
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