Changeset 1888 in ntrip
- Timestamp:
- Sep 22, 2009, 1:11:16 AM (16 years ago)
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TabularUnified trunk/BNC/bnchelp.html ¶
r1887 r1888 25 25 <a href=#limits>4. Limitations</a><br> 26 26 <a href=#authors>5. Authors</a><br> 27 <a href=#annex> 8. Annex</a><br>27 <a href=#annex>6. Annex</a><br> 28 28 </h4> 29 29 </p> … … 1203 1203 </p> 1204 1204 1205 <p><a name="annex"><h3> 8. Annex</h3></p>1206 <p> 1207 8.1. <a href=#history>Revision History</a><br>1208 8.2. <a href=#rtcm>RTCM</a><br>1209 8.2.1 NTRIP <a href=#ntrip1>Version 1</a><br>1210 8.2.2 NTRIP <a href=#ntrip2>Version 2</a><br>1211 8.2.3 RTCM <a href=#rtcm2>Version 2.x</a><br>1212 8.2.4 RTCM <a href=#rtcm3>Version 3.x</a><br>1213 8.3. <a href=#rtigs>RTIGS</a><br>1214 8.3.1 <a href=#soc>SOC</a><br>1215 8.4. <a href=#config>Configuration Example</a><br>1216 8.5. <a href=#links>Links</a><br>1217 </p> 1218 1219 <p><a name=history><h3> 8.1 Revision History</h3></p>1205 <p><a name="annex"><h3>6. Annex</h3></p> 1206 <p> 1207 6.1. <a href=#history>Revision History</a><br> 1208 6.2. <a href=#rtcm>RTCM</a><br> 1209 6.2.1 NTRIP <a href=#ntrip1>Version 1</a><br> 1210 6.2.2 NTRIP <a href=#ntrip2>Version 2</a><br> 1211 6.2.3 RTCM <a href=#rtcm2>Version 2.x</a><br> 1212 6.2.4 RTCM <a href=#rtcm3>Version 3.x</a><br> 1213 6.3. <a href=#rtigs>RTIGS</a><br> 1214 6.3.1 <a href=#soc>SOC</a><br> 1215 6.4. <a href=#config>Configuration Example</a><br> 1216 6.5. <a href=#links>Links</a><br> 1217 </p> 1218 1219 <p><a name=history><h3>6.1 Revision History</h3></p> 1220 1220 <table> 1221 1221 <tr></tr> … … 1269 1269 </p> 1270 1270 1271 <p><a name="rtcm"><h4> 8.2. RTCM</h4></p>1271 <p><a name="rtcm"><h4>6.2. RTCM</h4></p> 1272 1272 1273 1273 <p> … … 1277 1277 </p> 1278 1278 1279 <p><a name="ntrip1"><h4> 8.2.1 NTRIP Version 1</h4></p>1279 <p><a name="ntrip1"><h4>6.2.1 NTRIP Version 1</h4></p> 1280 1280 1281 1281 <p> … … 1316 1316 </p> 1317 1317 1318 <p><a name="ntrip2"><h4> 8.2.1 NTRIP Version 2</h4></p>1318 <p><a name="ntrip2"><h4>6.2.1 NTRIP Version 2</h4></p> 1319 1319 1320 1320 <p> … … 1334 1334 </p> 1335 1335 1336 <p><a name="rtcm2"><h4> 8.2.3 RTCM Version 2.x</h4></p>1336 <p><a name="rtcm2"><h4>6.2.3 RTCM Version 2.x</h4></p> 1337 1337 <p> 1338 1338 Transmitting GNSS carrier phase data can be done through RTCM Version 2.x messages. Please note that only RTCM Version 2.2 and 2.3 streams may include GLONASS data. Messages that may be of some interest here are: … … 1372 1372 </ul> 1373 1373 1374 <p><a name="rtcm3"><h4> 8.2.4 RTCM Version 3.x</h4></p>1374 <p><a name="rtcm3"><h4>6.2.4 RTCM Version 3.x</h4></p> 1375 1375 <p> 1376 1376 RTCM Version 3.x has been developed as a more efficient alternative to RTCM Version 2.x. Service providers and vendors have asked for a standard that would be more efficient, easy to use, and more easily adaptable to new situations. The main complaint was that the Version 2 parity scheme was wasteful of bandwidth. Another complaint was that the parity is not independent from word to word. Still another was that even with so many bits devoted to parity, the actual integrity of the message was not as high as it should be. Plus, 30-bit words are awkward to handle. The Version 3.x standard is intended to correct these weaknesses. … … 1400 1400 </ul> 1401 1401 1402 <p><a name="rtigs"><h4> 8.3. RTIGS</h4></p>1402 <p><a name="rtigs"><h4>6.3. RTIGS</h4></p> 1403 1403 <p> 1404 1404 RTIGS stands for a data format and transport protocol for GPS observations. It was defined by the Real-Time IGS Working Group (RTIGS WG). Its definition is based on the SOC format. Every RTIGS record has one of the following numbers: … … 1453 1453 </p> 1454 1454 1455 <p><a name="soc"><h4> 8.3.1 SOC</h4></p>1455 <p><a name="soc"><h4>6.3.1 SOC</h4></p> 1456 1456 <p> 1457 1457 The SOC format has been designed in July 1999 by the Jet Propulsion Laboratory (JPL) and the California Institute of Technology (CalTech) to transport 1Hz GPS data with minimal bandwidth over the open Internet. SOC follows the 'little-endian' byte order meaning that the low-order byte of a number is stored in memory at the lowest address, and the high-order byte at the highest address. Because the transport layer is UDP, the format does not include sync bits, a checksum, or cyclic redundancy checksum (CRC). SOC allows to transport the GPS observable CA, P1, P2, L1, and L2, efficiently compressed down to 14 bytes with 1 mm range resolution and 0.02 mm phase resolution. SOC contains epochs for cycle slips, a stand-alone time-tag per epoch, a minimum representation of the receiver's clock solution, 3 SNR numbers, a unique site id, a modulo 12 hour sequence number and flags for receiver type and GPS health. SOC's simple structure comprises an 8 byte header, a 9 byte overhead for timetag, number of gps, etc., plus 21 data bytes per gps. … … 1462 1462 <p> 1463 1463 </p> 1464 <p><a name="config"><h4> 8.4. Configuration Example</h4></p>1464 <p><a name="config"><h4>6.4. Configuration Example</h4></p> 1465 1465 <p> 1466 1466 The following table's left column is an example for the contents of a configuration file 'BNC.ini'. It enables the retrieval of stream ACOR0 form www.euref-ip.net for the generation of 15 min RINEX files. RINEX files are uploaded to an archive using script 'up2archive' : … … 1528 1528 </p> 1529 1529 1530 <p><a name="links"><h3> 8.5 Links</h3></p>1530 <p><a name="links"><h3>6.5 Links</h3></p> 1531 1531 <table> 1532 1532 <tr></tr>
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