- Timestamp:
- Oct 20, 2010, 10:41:17 AM (14 years ago)
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trunk/BNC/todo.txt
r2324 r2621 6 6 BNC 7 7 ========================= 8 (1) BNC has a problem when the observation update rate is > 1Hz. Records get 8 (1) NMEA GGA string is not fully compatible with the standard. 9 The following are observations by Tamas Horvath: 10 1. Time tag should refer to UTC time and not GPS system time. 11 2. Time tag format is hhmmss.ss and not hhmmss. 12 3. The GPS Quality indicator field is 1 (GPS SPS Mode), which is correct, as 13 there is no category for PPP. In my opinion the NMEA protocol should be 14 extended by a new indicator number for PPP to make a clear difference between 15 autonomous GNSS and PPP. 16 4. The HDOP value is constantly 2.0, which is obviously not real. I think this 17 field is filled with 2.0 as a default value in BNC. 18 5. The Age of Differential GPS data field is not populated. I believe here the 19 age of RTCM SSR data should be put. 20 (2) BNC has a problem when the observation update rate is > 1Hz. Records get 9 21 mixed then in the RINEX files. A 10 Hz stream to test the situation is 10 22 available from GFZ caster 139.17.3.112:4080 through stream A17H. 11 23 12 ( 2) GW: Keep an eye on www.igs-ip.net/PENC0.24 (3) GW: Keep an eye on www.igs-ip.net/PENC0. 13 25
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