2023-01-12 12:46:45 +00:00
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#!/usr/bin/env bash
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#
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# Horus Binary RTLSDR Helper Script
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#
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# Uses rtl_fm to receive a chunk of spectrum, and passes it into horus_demod.
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#
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# Calculate the SDR tuning frequency
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SDR_RX_FREQ=$(echo "$RXFREQ - $RXBANDWIDTH/2 - 1000" | bc)
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# Calculate the frequency estimator limits
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FSK_LOWER=1000
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FSK_UPPER=$(echo "$FSK_LOWER + $RXBANDWIDTH" | bc)
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echo "Using SDR Centre Frequency: $SDR_RX_FREQ Hz."
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echo "Using FSK estimation range: $FSK_LOWER - $FSK_UPPER Hz"
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BIAS_SETTING=""
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if [ "$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 $GAIN"
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fi
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# Start the receive chain.
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# Note that we now pass in the SDR centre frequency ($SDR_RX_FREQ) and 'target' signal frequency ($RXFREQ)
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# to enable providing additional metadata to Habitat / Sondehub.
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2023-07-28 12:00:06 +00:00
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rtl_fm -M raw -F9 -d $SDR_DEVICE -s 48000 -p $PPM $GAIN_SETTING$BIAS_SETTING -f $SDR_RX_FREQ | $DECODER -q --stats=5 -g -m binary --fsk_lower=$FSK_LOWER --fsk_upper=$FSK_UPPER - - | python3 -m horusdemodlib.uploader --freq_hz $SDR_RX_FREQ --freq_target_hz $RXFREQ $@
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