kopia lustrzana https://github.com/rs1729/RS
104 wiersze
4.1 KiB
Markdown
104 wiersze
4.1 KiB
Markdown
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## Radiosonde RS92
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Tools for decoding RS92-SGP and RS92-AGP radiosonde signals.
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Based on information already available at<br />
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http://brmlab.cz/project/weathersonde/
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### Files
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* `nav_gps_vel.c` - include-file for `rs92gps.c`, `rs92gps_2dfix.c`, `rs92ecc.c`, `rs92agp.c`;
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`RS/ecc/bch_ecc.c`
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* `rs92gps.c` - RS92-SGP decoder (includes `nav_gps_vel.c`)
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#### Compile
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`gcc rs92gps.c -lm -o rs92gps`
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#### Usage
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`./rs92gps [options] <file>` <br />
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* `file`: <br />
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1.1 `<audio.wav>`: FM-demodulated signal, recorded as wav audio file <br />
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2.1 `--rawin1 <raw_data>`: raw data file created with option `-r` <br />
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2.2 `--rawin2 <digitalsondeXX.txt>`: SM raw data
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* `options`: <br />
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`-i`: invert signal/polarity <br />
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`-r`: output raw data <br />
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`-a <almanacSEM>`: use SEM almanac (GPS satellites, orbital data)
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(cf. https://celestrak.com/GPS/almanac/SEM/) <br />
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`-e <ephemperisRinex>`: use RINEX ephemerides (GPS satellites, orbital data)
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(e.g. YYYY=2017: ftp://cddis.gsfc.nasa.gov/gnss/data/daily/2017/brdc/,
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brdcDDD0.YYn.Z, YY - year, DDD - day) <br />
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`-v`: additional data/info <br />
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`--vel`: output velocity (vH: horizontal, D: direction/heading, vV: vertical) <br />
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`--crc`: output only frames with valid GPS-CRC <br />
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`./rs92gps -h`: list more options
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#### Examples
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The rs92-radiosonde transmits pseudorange GPS data and GPS time.
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To calculate its position, orbital data of the GPS satellites is needed.
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You can use either almanac data which is less accurate (but can be used +/- 3 days),
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or rinex ephemerides data (recommended) which is more accurate but should not be
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older than 2 hours.
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The recommended sample rate of the FM-demodulated signal is 48 kHz.
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The GPS-altitude is above ellipsoid (in europe, subtract 40-50m geoid height).
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* `./rs92gps -r 2015101_14Z.wav > raw.txt` (raw output into `raw.txt`) <br />
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`./rs92gps -v -e brdc3050.15n --rawin1 raw.txt`
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* `./rs92gps -v -e brdc3050.15n 2015101_14Z.wav`
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* `./rs92gps -v --vel2 -e brdc3050.15n 2015101_14Z.wav | tee log.txt` (console output and into file `log.txt`)
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The FSK-demodulation is kept very simple. If the signal quality is low, a lowpass filter is recommended, e.g.
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(using `sox`)
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* `sox 2015101_14Z.wav -t wav - lowpass 2600 2>/dev/null | ./rs92gps -v -e brdc3050.15n`
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You can redirect live audio stream to the decoder via `sox`, e.g.
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* `sox -t oss /dev/dsp -t wav - lowpass 2600 2>/dev/null | ./rs92gps -v --vel -e brdc3050.15n`
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* `sox -t oss /dev/dsp -t wav - lowpass 2600 2>/dev/null | stdbuf -oL ./rs92gps -v --vel2 -e brdc3050.15n | tee log.txt` <br />
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If the signal is inverted
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(depends on sdr-software and/or audio-card/settings), try option `-i`.
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* `rs92gps_2dfix.c` - test decoder for 2d-fix (if only 3 satellites are available). If the position altitude is known/given,
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a position can be calculated with 3 satellites.
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#### Compile
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`gcc rs92gps_2dfix.c -lm -o rs92gps_2dfix`
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#### Usage
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Same as `rs92gps`.
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Additional option `--2dalt <alt>`: <br />
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`<alt>` is the (estimated) altitude of the radiosonde in meters above ellipsoid.
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Default (without `--2dalt <alt>`) is 0m.
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<!-- (commit 342) Reed-Solomon error correction (uses fec-lib by KA9Q)
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* ka9q-fec (fec-3.0.1): <br />
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`gcc -c init_rs_char.c` <br />
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`gcc -c decode_rs_char.c` <br />
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* `gcc init_rs_char.o decode_rs_char.o rs92ecc.c -lm -o rs92ecc` <br />
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(includes also `fec.h` from fec-3.0.1)
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Will be replaced by Reed-Solomon-Decoder in `RS/ecc/bch_ecc.c` (cf. `RS/rs41/rs41ecc.c`).
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-->
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* `rs92ecc.c` - RS92-SGP decoder with Reed-Solomon error correction (includes `nav_gps_vel.c`, `bch_ecc.c`)
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#### Compile
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* `gcc rs92ecc.c -lm -o rs92ecc` (copy `RS/ecc/bch_ecc.c`)
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#### Usage
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Same as `rs92gps`.
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Additional option `--ecc`.
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* `rs92agp.c` - RS92-AGP, RS92-BGP decoder
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* `rs92.txt` - infos
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* `gps_navdata.c` - test tool/example, compares orbital data. Includes `nav_gps.c` and
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compares `almanac.sem.week0843.061440.txt`, `brdc2910.15n`, `nga18670.Z`.
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<!-- * `rs92-almanac_gps_outage.jpg` -->
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