kopia lustrzana https://github.com/projecthorus/horusdemodlib
101 wiersze
3.0 KiB
Bash
Executable File
101 wiersze
3.0 KiB
Bash
Executable File
#!/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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# Change directory to the horusdemodlib directory.
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# If running as a different user, you will need to change this line
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cd /home/pi/horusdemodlib/
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# Receive *centre* frequency, in Hz
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# Note: The SDR will be tuned to RXBANDWIDTH/2 below this frequency.
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RXFREQ=434200000
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# RTLSDR Device Selection
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# If you want to use a specific RTLSDR, you can change this setting to match the
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# device identifier of your SDR (use rtl_test to get a list)
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SDR_DEVICE=0
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# Receiver Gain. Set this to 0 to use automatic gain control, otherwise if running a
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# preamplifier, you may want to experiment with different gain settings to optimize
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# your receiver setup.
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# You can find what gain range is valid for your RTLSDR by running: rtl_test
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GAIN=0
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# Bias Tee Enable (1) or Disable (0)
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BIAS=0
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# Receiver PPM offset
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PPM=0
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# Frequency estimator bandwidth. The wider the bandwidth, the more drift and frequency error the modem can tolerate,
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# but the higher the chance that the modem will lock on to a strong spurious signal.
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# Note: The SDR will be tuned to RXFREQ-RXBANDWIDTH/2, and the estimator set to look at 0-RXBANDWIDTH Hz.
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RXBANDWIDTH=10000
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# Enable (1) or disable (0) modem statistics output.
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# If enabled, modem statistics are written to stats.txt, and can be observed
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# during decoding by running: tail -f stats.txt | python fskstats.py
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STATS_OUTPUT=0
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# Check that the horus_demod decoder has been compiled.
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DECODER=./build/src/horus_demod
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if [ -f "$DECODER" ]; then
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echo "Found horus_demod."
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else
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echo "ERROR - $DECODER does not exist - have you compiled it yet?"
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exit 1
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fi
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# Check that bc is available on the system path.
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if echo "1+1" | bc > /dev/null; then
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echo "Found bc."
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else
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echo "ERROR - Cannot find bc - Did you install it?"
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exit 1
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fi
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# Use a local venv if it exists
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VENV_DIR=venv
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if [ -d "$VENV_DIR" ]; then
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echo "Entering venv."
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source $VENV_DIR/bin/activate
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fi
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# Calculate the SDR tuning frequency
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SDR_RX_FREQ=$(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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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 - - | python -m horusdemodlib.uploader --freq_hz $SDR_RX_FREQ --freq_target_hz $RXFREQ $@
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