Changeset 6917 in ntrip


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Jun 17, 2015, 12:29:41 PM (9 years ago)
Author:
weber
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  • trunk/BNC/src/bnchelp.html

    r6914 r6917  
    12191219<p><a name="sp3comp"><h4>3.7. SP3 Comparison</h4></p>
    12201220<p>
    1221 BNC allows to compare the contents of two files containing GNSS orbit and clock data in SP3 format. SP3 ASCII files basically contain 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.
    1222 </p>
    1223 <p>
    1224 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'.
     1221BNC allows to compare the contents of two files containing GNSS orbit and clock data in SP3 format. SP3 ASCII files basically contain 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 from one of the SP3 files. Note that BNC does not interpolate orbits when comparing SP3 files.
     1222</p>
     1223<p>
     1224To 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 coordinate differences. RMS values of clock differences are finally calculated after introducing at first one offset 'per epoch for all satellites' and secondly one offset 'per satellite for all epochs'.
    12251225</p>
    12261226
    … …  
    12501250</p>
    12511251<p>
    1252 Below you find an example for a SP3 Comparsion logfile. In its firt part it uses the following abbreviations:<br>
    1253 </p>
    1254 <table>
    1255 <tr><td>'MJD' &nbsp;</td><td>Modified Julian Date</td></tr>
    1256 <tr><td>'PRN' &nbsp;</td><td>Satellit specification</td></tr>
    1257 <tr><td>'radial' &nbsp;</td><td>Radial component of orbit coordinate difference [m]</td></tr>
    1258 <tr><td>'along' &nbsp;</td><td>Along track component of orbit coordinate difference [m]</td></tr>
    1259 <tr><td>'out' &nbsp;</td><td>Out-of-plane component of orbit coordinate difference [m]</td></tr>
    1260 <tr><td>'clk' &nbsp;</td><td>Clock difference [m]</td></tr>
    1261 <tr><td>'clkRed' &nbsp;</td><td>Clock difference reduced by radial component of orbit coordinate difference [m]</td></tr>
    1262 <tr><td>'iPRN' &nbsp;</td><td>BNC internal sequence number</td></tr>
    1263 </table>
    1264 <p>
    1265 The second part following string 'RMS' provides a summary of the comparison using the following abbreviations:<br>
    1266 </p>
    1267 <table>
    1268 <tr><td>'PRN' &nbsp;</td><td>Satellite specification</td></tr>
    1269 <tr><td>'radial' &nbsp;</td><td>RMS of radial component of orbit coordinate differences [m]</td></tr>
    1270 <tr><td>'along' &nbsp;</td><td>RMS of along track component of orbit coordinate differences [m]</td></tr>
    1271 <tr><td>'out' &nbsp;</td><td>RMS of out-of-plane component of orbit coordinate differences [m]</td></tr>
    1272 <tr><td>'nOrb' &nbsp;</td><td>Number of epochs used in in orbit comparision</td></tr>
    1273 <tr><td>'clk' &nbsp;</td><td>RMS of clock differences [m]</td></tr>
    1274 <tr><td>'clkRed' &nbsp;</td><td>RMS of clock differences after reduction of radial orbit differences [m]</td></tr>
    1275 <tr><td>'nClk' &nbsp;</td><td>Number of epochs use in clock comparisons</td></tr>
    1276 <tr><td>'Offset' &nbsp;</td><td>Clock offset [m]</td></tr>
    1277 </table>
    1278 
     1252The following is an example for a SP3 Comparsion logfile:
     1253</p>
    12791254<pre>
    12801255
    … …  
    13201295! Total  0.0262  0.0938  0.0492   5268  0.0620  0.0561   5268
    13211296</pre>
     1297<p>
     1298The first part int this uses the following abbreviations:
     1299</p>
     1300
     1301<table>
     1302<tr><td>'MJD' &nbsp;</td><td>Modified Julian Date</td></tr>
     1303<tr><td>'PRN' &nbsp;</td><td>Satellit specification</td></tr>
     1304<tr><td>'radial' &nbsp;</td><td>Radial component of orbit coordinate difference [m]</td></tr>
     1305<tr><td>'along' &nbsp;</td><td>Along track component of orbit coordinate difference [m]</td></tr>
     1306<tr><td>'out' &nbsp;</td><td>Out-of-plane component of orbit coordinate difference [m]</td></tr>
     1307<tr><td>'clk' &nbsp;</td><td>Clock difference [m]</td></tr>
     1308<tr><td>'clkRed' &nbsp;</td><td>Clock difference reduced by radial component of orbit coordinate difference [m]</td></tr>
     1309<tr><td>'iPRN' &nbsp;</td><td>BNC internal sequence number</td></tr>
     1310</table>
     1311<p>
     1312The second part following string 'RMS' provides a summary of the comparison using the following abbreviations:<br>
     1313</p>
     1314<table>
     1315<tr><td>'PRN' &nbsp;</td><td>Satellite specification</td></tr>
     1316<tr><td>'radial' &nbsp;</td><td>RMS of radial component of orbit coordinate differences [m]</td></tr>
     1317<tr><td>'along' &nbsp;</td><td>RMS of along track component of orbit coordinate differences [m]</td></tr>
     1318<tr><td>'out' &nbsp;</td><td>RMS of out-of-plane component of orbit coordinate differences [m]</td></tr>
     1319<tr><td>'nOrb' &nbsp;</td><td>Number of epochs used in in orbit comparision</td></tr>
     1320<tr><td>'clk' &nbsp;</td><td>RMS of clock differences [m]</td></tr>
     1321<tr><td>'clkRed' &nbsp;</td><td>RMS of clock differences after reduction of radial orbit differences [m]</td></tr>
     1322<tr><td>'nClk' &nbsp;</td><td>Number of epochs use in clock comparisons</td></tr>
     1323<tr><td>'Offset' &nbsp;</td><td>Clock offset [m]</td></tr>
     1324</table>
     1325
     1326<br>
     1327
     1328<p><img src="IMG/screenshot36.png"/></p>
     1329<p><u>Figure 14:</u> BNC configuration example for comparing two SP3 files with satellite orbit and clock data.</p>
    13221330
    13231331<p><a name="correct"><h4>3.8. Broadcast Corrections</h4></p>
    … …  
    16501658</p>
    16511659<p><img src="IMG/screenshot12.png"/></p>
    1652 <p><u>Figure 14:</u> Synchronized BNC output via IP port to feed a GNSS real-time engine.</p>
     1660<p><u>Figure 15:</u> Synchronized BNC output via IP port to feed a GNSS real-time engine.</p>
    16531661
    16541662<p><a name="syncport"><h4>3.9.1 Port - optional</h4></p>
    … …  
    16921700
    16931701<p><img src="IMG/screenshot35.png"/></p>
    1694 <p><u>Figure 15:</u> Flowcharts, BNC forwarding a stream to a serial connected receiver; sending NMEA sentences is mandatory for VRS streams.</p>
     1702<p><u>Figure 16:</u> Flowcharts, BNC forwarding a stream to a serial connected receiver; sending NMEA sentences is mandatory for VRS streams.</p>
    16951703
    16961704<p>
    … …  
    16991707
    17001708<p><img src="IMG/screenshot11.png"/></p>
    1701 <p><u>Figure 16:</u> BNC pulling a VRS stream to feed a serial connected RTK rover.</p>
     1709<p><u>Figure 17:</u> BNC pulling a VRS stream to feed a serial connected RTK rover.</p>
    17021710
    17031711<p><a name="sermount"><h4>3.10.1 Mountpoint - optional</h4></p>
    … …  
    18511859</p>
    18521860<p><img src="IMG/screenshot14.png"/></p>
    1853 <p><u>Figure 17:</u> RTCM message numbers, latencies and observation types.</p>
     1861<p><u>Figure 18:</u> RTCM message numbers, latencies and observation types.</p>
    18541862
    18551863
    … …  
    19471955
    19481956<p><img src="IMG/screenshot03.png"/></p>
    1949 <p><u>Figure 18:</u> Precise Point Positioning with BNC, PPP Panel 1.</p>
     1957<p><u>Figure 19:</u> Precise Point Positioning with BNC, PPP Panel 1.</p>
    19501958
    19511959<p><img src="IMG/screenshot18.png"/></p>
    1952 <p><u>Figure 19:</u> Precise Point Positioning with BNC, PPP Panel 2.</p>
     1960<p><u>Figure 20:</u> Precise Point Positioning with BNC, PPP Panel 2.</p>
    19531961
    19541962<p>
    … …  
    22462254
    22472255<p><img src="IMG/screenshot17.png"/></p>
    2248 <p><u>Figure 20:</u> BNC in 'Quick-Start' mode (PPP, Panel 1)</p>
     2256<p><u>Figure 21:</u> BNC in 'Quick-Start' mode (PPP, Panel 1)</p>
    22492257
    22502258<p><img src="IMG/screenshot22.png"/></p>
    2251 <p><u>Figure 21:</u> BNC in 'Quick-Start' mode (PPP, Panel 2)</p>
     2259<p><u>Figure 22:</u> BNC in 'Quick-Start' mode (PPP, Panel 2)</p>
    22522260
    22532261<p><a name="pppgap"><h4>3.13.7.8 Maximal Solution Gap - optional if Quick-Start is set</h4></p>
    … …  
    23272335<br>
    23282336<p><img src="IMG/screenshot32.png"/></p>
    2329 <p><u>Figure 22:</u> Track of positions from BNC with Google Maps in the background.</p>
     2337<p><u>Figure 23:</u> Track of positions from BNC with Google Maps in the background.</p>
    23302338
    23312339<p><a name="pppmap"><h4>3.13.10.1 Open Map - optional</h4></p>
    … …  
    24422450<br>
    24432451<p><img src="IMG/screenshot20.png"/></p>
    2444 <p><u>Figure 23:</u> BNC combining Broadcast Correction streams.</p>
     2452<p><u>Figure 24:</u> BNC combining Broadcast Correction streams.</p>
    24452453<p><br></p>
    24462454<p><img src="IMG/screenshot21.png"/></p>
    2447 <p><u>Figure 24:</u> BNC uploading the combined Broadcast Corrections stream.</p>
     2455<p><u>Figure 25:</u> BNC uploading the combined Broadcast Corrections stream.</p>
    24482456<p></p>
    24492457<p><img src="IMG/screenshot23.png"/></p>
    2450 <p><u>Figure 25:</u> 'INTERNAL' PPP with BNC using combined Broadcast Corrections stream.</p>
     2458<p><u>Figure 26:</u> 'INTERNAL' PPP with BNC using combined Broadcast Corrections stream.</p>
    24512459
    24522460<p><a name="combimethod"><h4>3.13.1.2 Method - mandatory if 'Combine Corrections' table is populated</h4></p>
    … …  
    28532861</p>
    28542862<p><img src="IMG/screenshot26.png"/></p>
    2855 <p><u>Figure 26:</u> Producing Broadcast Corrections from incoming precise orbits and clocks and uploading them to an NTRIP Broadcaster.</p>
     2863<p><u>Figure 27:</u> Producing Broadcast Corrections from incoming precise orbits and clocks and uploading them to an NTRIP Broadcaster.</p>
    28562864
    28572865<p><a name="upeph"><h4>3.16. Upload Ephemeris</h4></p>
    … …  
    28802888
    28812889<p><img src="IMG/screenshot28.png"/></p>
    2882 <p><u>Figure 27:</u> Producing a Broadcast Ephemeris stream from navigation messages of globally distributed RTCM streams and uploading them in RTCM Version 3 format to an NTRIP Broadcaster.</p>
     2890<p><u>Figure 28:</u> Producing a Broadcast Ephemeris stream from navigation messages of globally distributed RTCM streams and uploading them in RTCM Version 3 format to an NTRIP Broadcaster.</p>
    28832891
    28842892<p><a name="streams"><h4>3.17. Streams</h4></p>
    … …  
    29472955
    29482956<p><img src="IMG/screenshot08.png"/></p>
    2949 <p><u>Figure 28:</u> Bandwidth consumption of incoming streams.</p>
     2957<p><u>Figure 29:</u> Bandwidth consumption of incoming streams.</p>
    29502958
    29512959<p><a name="latency"><h4>3.18.3 Latency</h4></p>
    … …  
    29552963
    29562964<p><img src="IMG/screenshot07.png"/></p>
    2957 <p><u>Figure 29:</u> Latency of incoming streams.</p>
     2965<p><u>Figure 30:</u> Latency of incoming streams.</p>
    29582966
    29592967<p><a name="ppptab"><h4>3.18.4 PPP Plot</h4></p>
    … …  
    29632971
    29642972<p><img src="IMG/screenshot13.png"/></p>
    2965 <p><u>Figure 30:</u> Time series plot of PPP session.</p>
     2973<p><u>Figure 31:</u> Time series plot of PPP session.</p>
    29662974
    29672975<p><a name="bottom"><h4>3.19. Bottom Menu Bar</h4></p>
    … …  
    29712979
    29722980<p><img src="IMG/screenshot06.png"/></p>
    2973 <p><u>Figure 31:</u> Steam input communication links.</p>
     2981<p><u>Figure 32:</u> Steam input communication links.</p>
    29742982
    29752983<p><a name="streamadd"><h4>3.19.1 Add Stream</h4></p>
    … …  
    29963004<p><img src="IMG/screenshot04.png"/></p>
    29973005
    2998 <p><u>Figure 32:</u> Casters table.</p>
     3006<p><u>Figure 33:</u> Casters table.</p>
    29993007
    30003008<p><a name="streamuser"><h4>3.19.1.1.3 User and Password - mandatory for protected streams</h4></p>
    … …  
    30143022</p>
    30153023<p><img src="IMG/screenshot05.png"/></p>
    3016 <p><u>Figure 33:</u> Broadcaster source-table.</p>
     3024<p><u>Figure 34:</u> Broadcaster source-table.</p>
    30173025
    30183026<p><a name="ntripv"><h4>3.19.1.1.5 NTRIP Version - mandatory</h4></p>
    … …  
    30443052
    30453053<p><img src="IMG/screenshot24.png"/></p>
    3046 <p><u>Figure 34:</u> Stream distribution map derived from NTRIP Broadcaster source-table.</p>
     3054<p><u>Figure 35:</u> Stream distribution map derived from NTRIP Broadcaster source-table.</p>
    30473055
    30483056<p><a name="streamip"><h4>3.19.1.2 Add Stream - Coming from TCP/IP Port</h4></p>
    … …  
    31183126</p>
    31193127<p><img src="IMG/screenshot15.png"/></p>
    3120 <p><u>Figure 35:</u> BNC setup for pulling a stream via serial port.</p>
     3128<p><u>Figure 36:</u> BNC setup for pulling a stream via serial port.</p>
    31213129
    31223130<p><a name="streamsdelete"><h4>3.19.2 Delete Stream</h4></p>
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