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rs1729 / RS

radiosonde decoding
GNU General Public License v3.0
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m10ptu show invalid frames #46

Closed modem2k2 closed 2 years ago

modem2k2 commented 2 years ago

Using m10ptu sometimes i get incorrect readings (time, date, alt and lat/lon), this does not happen with other decoders like sondemonitor. I wonder if it would be possible to improve the performance or extra frame checks. I don't see that the decoder has any command line switch, would it be possible to show only the valid frames?

(W 2218) Di 2022-07-12 (14:14:50)  lat: 39.XXXXXX  lon: -1.XXXXXX  alt: 878.31
 (W 2218) Di 2022-07-12 (14:14:52)  lat: 39.XXXXXX  lon: -1.XXXXXX  alt: 872.00
 (W 2218) Di 2022-07-12 (14:14:55)  lat: 39.XXXXXX  lon: -1.XXXXXX  alt: 862.64
 (W 272) Di 1985-03-26 (14:14:59)  lat: 39.XXXXXX  lon: -2.XXXXXX alt: 1682.48
 (W 272) Di 1985-03-26 (14:15:18)  lat: 39.XXXXXX  lon: -2.XXXXXX alt: 1261.89
 (W 2218) Di 2022-07-12 (14:15:33)  lat: 39.XXXXXX  lon: -1.XXXXXX  alt: 728.86
 (W 2218) Di 2022-07-12 (14:15:39)  lat: 39.XXXXXX  lon: -1.XXXXXX  alt: 657.37
 (W 1088) Di 2000-11-14 (14:15:57)  lat: 25.XXXXXX  lon: -2.XXXXXX alt: 61.82
 (W 544) Mo 1990-06-11 (23:37:43)  lat: 30.XXXXXX  lon: -2.XXXXXX  alt: 1203.45
rs1729 commented 2 years ago

The decoding in RS/m10/m10ptu.c is kept very simple. If the signal is not very strong, use either a low pass filter or use the option -b or -b2. Use option -vvto see the serial number and the checksum result ([OK] or [NO]) for each frame; this way you could filter/grep only the OK-frames. Option --ptu gives you the temperature values. Then there is the option -c for colored output.

However, the m10ptu-decoder is old and deprecated. Consider using m10mod.c in https://github.com/rs1729/RS/tree/master/demod/mod See the README there, there is also a Makefile. Recommended options for M10: ./m10mod -vv --ptu -c <audio.wav>

modem2k2 commented 2 years ago

Thanks for the quick reply, I will try these tips. :)