HOWTO: Airspy mini and Airspy R2: Piaware / dump1090-fa configuration

caius · September 12, 2024, 11:01pm

If anyone wants to do some testing on gain, a while ago I wrote a couple of scripts which will cycle through various gain settings and produce some graphs detailing the results. It changes gain every 10 minutes and runs for 48 hours.

github.com

caiusseverus/adsbcompare/blob/master/airspygaintest.sh

#!/bin/bash

original=$(sed -n 's/GAIN= //p' /etc/default/airspy_adsb)
echo "Original gain= $original"
gains=( 11 13 15 17 19 21 )
end=$((SECONDS+172710))

while [ $SECONDS -lt $end ]; do
    echo "Shuffling gains"
    gains=( $(shuf -e "${gains[@]}") )
    echo "${gains[*]}"
    for i in "${gains[@]}"
    do
        echo "Setting gain to $i"
        sudo sed -i -e "s/^GAIN= .*/GAIN= $i/" /etc/default/airspy_adsb
        sudo systemctl restart airspy_adsb
        sleep 600
    done
done

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does the testing, and

github.com

caiusseverus/adsbcompare/blob/master/airspystats.py

import os, io, subprocess, sys
import pandas as pd
import numpy as np
import time

if os.environ.get('DISPLAY') is None: # this variable will not be set when X Server is not running
    import matplotlib as mplib
 # set a  different display back-end to squash the error
    mplib.use('Agg')

from functools import reduce
import matplotlib.pyplot as plt
import seaborn as sns

# define parser to convert unix timestamp to datetime

def date_parser(string_list):
    return [time.ctime(float(x)) for x in string_list]

# Set output directory. The dump1090 html directory gives easy access via browser.

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produces the graphs at the end by pulling data from the graphs1090 data. The data collection is over 48 hours because that’s the period graphs1090 maintains the higher resolution data for.

I haven’t run it in a while so not sure if there’s any issue with current python or library versions.

Here is some discussion of it previously: Signal Strength Heatmap - #526 by caius

Here is some results from when I ran it originally: HOWTO: Airspy mini and Airspy R2: Piaware / dump1090-fa configuration - #3621 by caius

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HOWTO: Airspy mini and Airspy R2: Piaware / dump1090-fa configuration

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