Changeset 366 in ntrip for trunk/BNC/bnchelp.html

Timestamp:

Jan 17, 2007, 4:17:20 PM (17 years ago)

Author:

mervart

Message:

* empty log message *

File:

• trunk/BNC/bnchelp.html (modified) (9 diffs)

trunk/BNC/bnchelp.html

@@ -60 +60 @@
 &nbsp; &nbsp; &nbsp; B - 5.5. <a href=#rnxskeleton>RINEX Skeleton Extension</a><br>
 &nbsp; &nbsp; &nbsp; B - 5.6. <a href=#rnxappend>Append Files</a><br>
-&nbsp; &nbsp; &nbsp; B - 5.7. <a href=#approxlatlon>Approx. Lat./Lon.</a><br>
 B - 6. <a href=#mountpoints>Mountpoints</a><br>
 &nbsp; &nbsp; &nbsp; B - 6.1. <a href=#AddMounts>Add Mountpoints</a><br>
@@ -119 +118 @@
 <p>
 BNC lets you output synchronized observations epoch by epoch. This output is made available in a plain ASCII format and in a binary format. The output comprises the following observations if available:</p>
-StatID, SVPRN, GPSWeek, GPSWeeks, C1, P1, P2, L1, L2, SNR1, SNR2.
+StatID, SVPRN, GPSWeek, GPSWeeks, C1, C2, P1, P2, L1, L2, SNR1, SNR2.
 </p>
 <p>
@@ -164 +163 @@
   int    GPSWeek;     // Week of GPS-Time
   double GPSWeeks;    // Second of Week (GPS-Time)
-  double C1;          // CA-code pseudorange (meters)
+  double C1;          // C1-code pseudorange (meters)
+  double C2;          // C2-code pseudorange (meters)
   double P1;          // P1-code pseudorange (meters)
   double P2;          // P2-code pseudorange (meters)
@@ -176 +176 @@
 <p><a name="rinex"><h4>B - 5. RINEX</h4></p>
 <p>
-Observations are converted to RINEX Version 2.1. RINEX file names are derived by BNC from the first 4 characters of the corresponding mountpoint (4Char Station ID) while omitting the residual part of the mountpoint string. Thus, retrieving data from mountpoints FRANKFURT and WETTZELL leads to hourly RINEX observation files named</p>
+Observations are converted to RINEX Version 2.11. RINEX file names are derived by BNC from the first 4 characters of the corresponding mountpoint (4Char Station ID) while omitting the residual part of the mountpoint string. Thus, retrieving data from mountpoints FRANKFURT and WETTZELL leads to hourly RINEX observation files named</p>
 <p>
 FRAN{ddd}{h}.{yy}O<br>
@@ -205 +205 @@
 </p>
 <p>
-BNC's RINEX observation files generally contain C1, P1, P2, L1, and L2 observations. In case an observation is unavailable, its value is set to zero '0.000'. Note that even if a RINEX file does not contain GLONASS data, the 'RINEX TYPE' field in the RINEX file header may be set to 'M (MIXED)'.
+BNC's RINEX observation files generally contain C1, C2, P1, P2, L1, L2, SNR1, and SNR3 observations. In case an observation is unavailable, its value is set to zero '0.000'. Note that even if a RINEX file does not contain GLONASS data, the 'RINEX TYPE' field in the RINEX file header may be set to 'M (MIXED)'.
 </p>
 
@@ -283 +283 @@
 When starting BNC, new RINEX files are created by default. Probably existing files will be overwritten. However, it may be desirable to append observations to already existing RINEX files following a restart of BNC after an intentional 'Stop', a system crash or a crash of BNC. Hit 'Append files' to continue with already existing files and thus save what has been recorded so far. Note that the option 'Append files' also concerns the 'ASCII output file' and the 'Log' file.
 </p> 
-
-<p><a name="approxlatlon"><h4>B - 5.7 Approx. Lat./Lon. - mandatory for Virtual Reference Stations (VRS)</h4></p>
-<p>
-BNC allows to retrieve streams from Virtual Reference Stations (VRS). For that an approximate rover position needs to be send in NMEA format to a VRS supporting NTRIP broadcaster. In return, an individual user-specific data stream is generated by a network RTK software. This stream is tailored exactly to the 'Approx. Lat./Lon.' you enter. The approximate position has to be introduced in northern latitude degrees (example for northern hemisphere: 52.436, example for eastern hemisphere: -24.567) and eastern longitude degrees (example: 358.872 or -1.128).
-</p>
-<p>
-Introducing an 'Approx. Lat./Lon.' is only necessary when retrieving a VRS stream. The approximate position must point to a location within the service area of the affected RTK network. Note that VRS streams that require an 'Approx. Lat./Lon.' are marked by the integer '1' in data field 'nmea' of the affected NTRIP broadcaster source-table. Note further that when working in a Local Area Network (LAN), NMEA messages may be blocked by a proxy server, firewall or virus scanner.
-</p> 
-
 <p><a name="mountpoints"><h4>B - 6. Mountpoints</h4></p>
 <p>
 Each stream on an NTRIP broadcaster is defined through a unique source ID called mountpoint. An NTRIP client like BNC can access the data of a desired stream by its mountpoint. Information about mountpoints is available through the source-table maintained by the NTRIP broadcaster. Note that mountpoints could show up in BNC more than once when retrieving streams from several NTRIP broadcasters.
-</p> 
+</p>
+
+Streams selected for retrieval are listed in the 'Mountpoints' section on BNC's main window. The list provides the following information extracted from NTRIP broadcaster source-tables:
+ 
+<table>
+<tr></tr>
+<tr><td>'mountpoint' &nbsp;</td><td>NTRIP broadcaster URL, port, and mountpoint.</td></tr>
+<tr><td>'decoder' &nbsp;</td><td>Internal decoder used to handle the incoming stream content according to its format; editable.</td></tr>
+<tr><td>'lat' &nbsp;</td><td>Latitude of reference station, degrees, north; editable for VRS streams.</td></tr>
+<tr><td>'long' &nbsp;</td><td>Longitude of reference station, degrees, east; editable for VRS streams.</td></tr>
+<tr><td>'type' &nbsp;</td><td>Mountpoint refers to physical Reference Station (RS) or Virtual Reference Station (VRS).</td></tr>
+<tr><td>'bytes' &nbsp;</td><td>Number of bytes retrieved.
+</table>
 
 <p><a name="AddMounts"><h4>B - 6.1 Add Mountpoints</h4></p>
@@ -325 +328 @@
 
 <p><a name="edit"><h4>B - 6.6 Edit Mountpoints</h4></p>
-<p>
-BNC automatically selects one out of several incorporated decoders for a stream based on its 'format' and 'format-details' as given in the source-table. It may happen that you need to overrule the automated decoder selection because of source-table setup deficiencies. Therefore BNC allows to edit (double-click) the decoder string for each stream shown under 'Mountpoints'. Accepted decoder strings allowed to be introduced are 'RTCM_2.x', 'RTCM_3', and 'RTIGS'.
-</p> 
+<ul>
+<li>
+BNC automatically selects one out of several internal decoders for a stream based on its 'format' and 'format-details' as given in the source-table. It may happen that you need to overrule the automated decoder selection because of source-table setup deficiencies. Therefore BNC allows to edit the decoder string (first double-click, then edit field 'decoder', then hit Enter) for the streams shown under 'Mountpoints'. Accepted decoder strings allowed to be introduced are 'RTCM_2.x', 'RTCM_3', and 'RTIGS'.
+</li>
+<li>
+BNC allows to retrieve streams from Virtual Reference Stations. Whether a stream comes from a physical Reference Station (RS) or a Virtual Reference Station (VRS) is indicated in column 'type' under 'Mountpoints' as well as in column 'type' of the affected source-table. For retrieving a VRS stream, an approximate rover position is required to be send in NMEA format to the NTRIP broadcaster. In return, an individual user-specific data stream is generated, usually by a network RTK software. This stream is tailored exactly to the latitude and longitude shown in the 'lat' and 'long' columns under 'Mountpoints'. Default values for 'lat' and 'long' are taken from the source-table. You may change these values (first double-click, then edit fields 'lat' and/or 'long', then hit Enter) according to your needs. The position has to be introduced in northern latitude degrees (example for northern hemisphere: 52.436, example for eastern hemisphere: -24.567) and eastern longitude degrees (example: 358.872 or -1.128). Editing the 'lat' and 'long' values under 'Mountpoints' is only possible for VRS streams. The position must point to a location within the service area of the affected RTK network.  Note that when running BNC in a Local Area Network (LAN), NMEA strings may be blocked by a proxy server, firewall or virus scanner.
+</li>
+</ul> 
 
 <p><a name="log"><h4>B - 7. Log - optional</h4></p>
@@ -358 +366 @@
 </li> 
 <li>
-So far BNC only handles GPS and GLONASS data while ignoring Galileo. Furthermore, its function is limited today to processing C1, P1, P2, L1, and L2 observations only.
-</li>
-<li>
-Due to a limitation of the RTIGS format and transport protocol, streams coming in that format can only contain GPS data.
+So far BNC only handles GPS and GLONASS data while ignoring Galileo.
+</li>
+<li>
+BNC's function is limited today to processing C1, C2, P1, P2, L1, L2, SNR1, and SNR2 observations. Which observables become available through a specific stream depends on the setup of the affected receiver and the applied data format. Note that RTCM Version 2.x streams can not transport signal-to-noise ratios (SNR) and RTCM Version 3 streams can only transport one code observable per frequency. Note further that signal-to-noise ratios SNR1 and SNR2 are mapped to integer numbers 1 to 9.
 </li>
 <li>
@@ -367 +375 @@
 </li>
 <li>
-If the ambiguity field is not set in RTCM Version 3 streams, the BNC output will be no valid RINEX. All values will be stored modulo 299792.458. A COMMENT line will tell you, when this happens. It would be necessary to approximately calculate the range to fix the ambiguity (needing ephemeris/almanac and easy positioning algorithm).
+If the ambiguity field is not set in RTCM Version 3 streams (i.e. when sending message type 1003 but no 1004), the BNC output will be no valid RINEX. All values will be stored modulo 299792.458. (It would be necessary to approximately calculate the range to fix the ambiguity, needing ephemeris/almanac and an easy positioning algorithm).
+</li>
+<li>
+As a consequence of the current implementation of the RTIGS format and transport protocol, streams coming in that format contain only GPS data.
 </li>
 <li>