kopia lustrzana https://github.com/projecthorus/horusdemodlib
53 wiersze
2.0 KiB
Bash
Executable File
53 wiersze
2.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# Dual RTTY / Horus Binary Decoder Script
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# Intended for use on Horus flights, with the following payload frequencies:
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# RTTY: 434.650 MHz - Callsign 'HORUS'
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# MFSK: 434.660 MHz - Callsign 'HORUSBINARY'
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#
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# The SDR is tuned 5 kHz below the RTTY frequency, and the frequency estimators are set across the two frequencies.
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# Modem statistics are sent out via a new 'MODEM_STATS' UDP broadcast message every second.
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#
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# Calculate the frequency estimator limits
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# Note - these are somewhat hard-coded for this dual-RX application.
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RTTY_LOWER=$(echo "$RTTY_SIGNAL - $RXBANDWIDTH/2" | bc)
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RTTY_UPPER=$(echo "$RTTY_SIGNAL + $RXBANDWIDTH/2" | bc)
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RTTY_CENTRE=$(echo "$RXFREQ + $RTTY_SIGNAL" | bc)
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MFSK_LOWER=$(echo "$MFSK_SIGNAL - $RXBANDWIDTH/2" | bc)
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MFSK_UPPER=$(echo "$MFSK_SIGNAL + $RXBANDWIDTH/2" | bc)
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MFSK_CENTRE=$(echo "$RXFREQ + $MFSK_SIGNAL" | bc)
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echo "Using SDR Centre Frequency: $RXFREQ Hz."
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echo "Using RTTY estimation range: $RTTY_LOWER - $RTTY_UPPER Hz"
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echo "Using MFSK estimation range: $MFSK_LOWER - $MFSK_UPPER Hz"
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BIAS_SETTING=""
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if [ "$BIAS" = "1" ]; then
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echo "Enabling Bias Tee."
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BIAS_SETTING=" -T"
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fi
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GAIN_SETTING=""
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if [ "$GAIN" = "0" ]; then
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echo "Using AGC."
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GAIN_SETTING=""
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else
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echo "Using Manual Gain"
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GAIN_SETTING=" -g $GAIN"
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fi
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STATS_SETTING=""
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if [ "$STATS_OUTPUT" = "1" ]; then
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echo "Enabling Modem Statistics."
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STATS_SETTING=" --stats=100"
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fi
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# Start the receive chain.
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# Note that we now pass in the SDR centre frequency ($RXFREQ) and 'target' signal frequency ($RTTY_CENTRE / $MFSK_CENTRE)
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# to enable providing additional metadata to Habitat / Sondehub.
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rtl_fm -M raw -F9 -d $SDR_DEVICE -s 48000 -p $PPM $GAIN_SETTING$BIAS_SETTING -f $RXFREQ | tee >($DECODER -q --stats=5 -g -m RTTY --fsk_lower=$RTTY_LOWER --fsk_upper=$RTTY_UPPER - - | python3 -m horusdemodlib.uploader --rtty --freq_hz $RXFREQ --freq_target_hz $RTTY_CENTRE ) >($DECODER -q --stats=5 -g -m binary --fsk_lower=$MFSK_LOWER --fsk_upper=$MFSK_UPPER - - | python3 -m horusdemodlib.uploader --freq_hz $RXFREQ --freq_target_hz $MFSK_CENTRE ) > /dev/null
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