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Last change
on this file since 2621 was 2621, checked in by weber, 15 years ago |
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NMEA string not fully compatible to standard
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File size:
1.0 KB
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| 1 | Todo's sorted by priority:
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| 2 |
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| 3 | BNS
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| 4 | =========================
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| 5 |
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| 6 | BNC
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| 7 | =========================
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| 8 | (1) NMEA GGA string is not fully compatible with the standard.
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| 9 | The following are observations by Tamas Horvath:
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| 10 | 1. Time tag should refer to UTC time and not GPS system time.
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| 11 | 2. Time tag format is hhmmss.ss and not hhmmss.
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| 12 | 3. The GPS Quality indicator field is 1 (GPS SPS Mode), which is correct, as
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| 13 | there is no category for PPP. In my opinion the NMEA protocol should be
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| 14 | extended by a new indicator number for PPP to make a clear difference between
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| 15 | autonomous GNSS and PPP.
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| 16 | 4. The HDOP value is constantly 2.0, which is obviously not real. I think this
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| 17 | field is filled with 2.0 as a default value in BNC.
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| 18 | 5. The Age of Differential GPS data field is not populated. I believe here the
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| 19 | age of RTCM SSR data should be put.
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| 20 | (2) BNC has a problem when the observation update rate is > 1Hz. Records get
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| 21 | mixed then in the RINEX files. A 10 Hz stream to test the situation is
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| 22 | available from GFZ caster 139.17.3.112:4080 through stream A17H.
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| 23 |
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| 24 | (3) GW: Keep an eye on www.igs-ip.net/PENC0.
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| 25 |
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