Changeset 6613 in ntrip


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Timestamp:
Mar 2, 2015, 10:08:39 AM (7 years ago)
Author:
weber
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  • trunk/BNC/src/bnchelp.html

    r6594 r6613  
    948948<p><a name="sp3comp"><h4>3.7. SP3 Comparison</h4></p>
    949949<p>
    950 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.
    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 an offset 'per epoch for all satellites' plus an offset 'per satellite for all epochs'.
     950BNC 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>
     953To 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'.
    954954</p>
    955955
     
    967967<li>R (excluding all GLONASS satellites)</li>
    968968<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 4 as 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>
    970970</ul>
    971971</p>
     
    983983<table>
    984984<tr><td>'MJD' &nbsp;</td><td>Modified Julian Date</td></tr>
    985 <tr><td>'PRN' &nbsp;</td><td>System specification and satellite PRN</td></tr>
    986 <tr><td>'radial' &nbsp;</td><td>Radial component of orbit coordinate difference</td></tr>
    987 <tr><td>'along' &nbsp;</td><td>Along track component of orbit coordinate difference</td></tr>
    988 <tr><td>'out' &nbsp;</td><td>Out-of-plane component of orbit coordinate difference</td></tr>
    989 <tr><td>'clk' &nbsp;</td><td>Clock difference</td></tr>
    990 <tr><td>'clkRed' &nbsp;</td><td>Clock difference reduced by radial component of orbit coordinate difference</td></tr>
     985<tr><td>'PRN' &nbsp;</td><td>Satellit specification</td></tr>
     986<tr><td>'radial' &nbsp;</td><td>Radial component of orbit coordinate difference [m]</td></tr>
     987<tr><td>'along' &nbsp;</td><td>Along track component of orbit coordinate difference [m]</td></tr>
     988<tr><td>'out' &nbsp;</td><td>Out-of-plane component of orbit coordinate difference [m]</td></tr>
     989<tr><td>'clk' &nbsp;</td><td>Clock difference [m]</td></tr>
     990<tr><td>'clkRed' &nbsp;</td><td>Clock difference reduced by radial component of orbit coordinate difference [m]</td></tr>
    991991<tr><td>'iPRN' &nbsp;</td><td>BNC internal sequence number</td></tr>
    992992</table>
    993993<p>
    994 The second part following string 'RMS[m]' provides a summary of the comparison using the following abbreviations:
     994The second part following string 'RMS' provides a summary of the comparison using the following abbreviations:
    995995</p>
    996996<table>
    997 <tr><td>'PRN' &nbsp;</td><td>System specification and satellite PRN</td></tr>
    998 <tr><td>'radial' &nbsp;</td><td>RMS of radial component of orbit coordinate differences</td></tr>
    999 <tr><td>'along' &nbsp;</td><td>RMS of along track component of orbit coordinate differences</td></tr>
    1000 <tr><td>'out' &nbsp;</td><td>RMS of out-of-plane component of orbit coordinate differences</td></tr>
     997<tr><td>'PRN' &nbsp;</td><td>Satellite specification</td></tr>
     998<tr><td>'radial' &nbsp;</td><td>RMS of radial component of orbit coordinate differences [m]</td></tr>
     999<tr><td>'along' &nbsp;</td><td>RMS of along track component of orbit coordinate differences [m]</td></tr>
     1000<tr><td>'out' &nbsp;</td><td>RMS of out-of-plane component of orbit coordinate differences [m]</td></tr>
    10011001<tr><td>'nOrb' &nbsp;</td><td>Number of epochs used in in orbit comparision</td></tr>
    1002 <tr><td>'clk' &nbsp;</td><td>RMS of clock differences</td></tr>
    1003 <tr><td>'clkRed' &nbsp;</td><td>RMS of clock differences after reduction of radial orbit differences</td></tr>
     1002<tr><td>'clk' &nbsp;</td><td>RMS of clock differences [m]</td></tr>
     1003<tr><td>'clkRed' &nbsp;</td><td>RMS of clock differences after reduction of radial orbit differences [m]</td></tr>
    10041004<tr><td>'nClk' &nbsp;</td><td>Number of epochs use in clock comparisons</td></tr>
    1005 <tr><td>'Offset' &nbsp;</td><td>Clock offsets</td></tr>
     1005<tr><td>'Offset' &nbsp;</td><td>Clock offset [m]</td></tr>
    10061006</table>
    10071007
     
    10281028! RMS[m]
    10291029!
    1030 MJD      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
     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
    10481048!
    1049 !          Total  0.0262  0.0938  0.0492   5268  0.0620  0.0561   5268
     1049! Total  0.0262  0.0938  0.0492   5268  0.0620  0.0561   5268
    10501050</pre>
    10511051
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