144 lines
2.7 KiB
Bash
Executable File
144 lines
2.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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## Receives a pass of a NOAA Satellite
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##
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## usage: __PROG__ [options]
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##
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set -o pipefail
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prog="$0"
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me=${HELP:-$(basename "${prog}")}
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rootdir=$(dirname $(realpath $0))
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source "${rootdir}/lib/utils.sh"
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# defaults
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freq="137M"
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duration=10
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gain_flag=''
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sample_rate=11025
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bandwidth=40000
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now=$(date +%s)
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output_file=./pass.wav
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# bandwidth = 2 * (17kHz deviation + 2.4kHz tone) * doppler shift (~1.2kHz)
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# wavfile is determined by options
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# DEPRECATED
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outdir=.
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outfile=pass.wav
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function process_args() {
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while (( "$#" ))
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do
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case $1 in
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## --freq <frequency> (default: 137M)
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'--freq')
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freq=${2}
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log "frequency set to ${freq}"
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shift
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;;
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## --duration <seconds> (default: 900)
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'--duration')
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duration=${2}
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log "duration set to ${duration}"
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shift
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;;
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## --gain <integer> (default: auto)
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'--gain')
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gain_flag="-g ${2}"
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log "gain set to ${2}"
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shift
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;;
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# --output|-o <file> name/path of the output file or directory
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'--output' | '-o')
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output_file=${2}
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shift
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;;
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## --noaa-15 alias --freq 137620000
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'--noaa-15')
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freq=137620000
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;;
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## --noaa-18 alias --freq 137912500
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'--noaa-18')
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freq=137912500
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;;
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## --noaa-19 alias --freq 137100000
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'--noaa-19')
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freq=137100000
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;;
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# TODO: ## --bias-t, -T enable hardware Bias-T power
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## --monitor monitor recording
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'--monitor')
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monitor=1
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;;
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## --help, -h
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'--help' | '-h')
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usage
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exit
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;;
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*)
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logerr "Unknown argument %s" ${1}
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exit 1
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;;
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esac
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shift
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done
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}
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function demodulate_pass() {
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timeout ${duration} rtl_fm -T -f ${freq} -M fm ${gain_flag} -s ${bandwidth} -r ${sample_rate} -E wav -E deemp -F 9 -A fast
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}
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function resample_pass() {
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sox -r ${sample_rate} -t raw -e s -b 16 -c 1 -V1 - ${1}
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}
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function monitor_pass() {
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( [ -z $monitor ] && cat || tee >(play -r ${sample_rate} -t raw -es -b 16 -c 1 -V1 -) )
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}
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function device_is_connected() {
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lsusb | grep RTL2838 > /dev/null
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}
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# If sourced, return now
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if [ "${0}" != "${BASH_SOURCE[0]}" ]; then
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return
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fi
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# -- Do work below here --
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process_args $@
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if device_is_connected; then
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log "Found device"
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else
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logerr "No devices found"
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exit 2
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fi
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output_file=${output_file:-'./wxrx.wav'}
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log "Current timestamp: %s" ${now}
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log "Listening for signal on ${freq} for ${duration} seconds (gain: ${gain})"
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demodulate_pass | monitor_pass | resample_pass ${output_file}
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# Cleanup
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log "Finished writing to ${output_file}"
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# Verify that a wavfile was created
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if [ ! -f ${output_file} ]; then
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logerr "No output file created."
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exit 1
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fi
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