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more tweaks to autogain
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3 changed files with 10 additions and 8 deletions
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@ -169,8 +169,8 @@ If you have set `READSB_GAIN=autogain`, then the system will take signal strengt
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There are 2 distinct periods in which the container will attempt to figure out the gain:
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* The initial period of 90 minutes, in which a measurement is taken every 5 minutes
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* The subsequent period, in which a measurement is taken once every day
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* The initial period of 2 hours, in which an adjustment is done every 5 minutes
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* The subsequent period, in which an adjustment is done once every day
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Please note that in order for the initial period to complete, the container must run for 90 minutes without restarting.
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@ -182,10 +182,11 @@ Although not recommended, you can change the measurement intervals and low/high
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| Environment Variable | Purpose | Default |
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|----------------------|---------|---------|
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| `READSB_AUTOGAIN_INITIAL_TIMEPERIOD` | How long the Initial Time Period should last (in seconds) | `7200` |
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| `READSB_AUTOGAIN_INITIAL_INTERVAL` | The measurement interval to optimize gain during the initial period of 90 minutes (in seconds) | `300` |
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| `READSB_AUTOGAIN_SUBSEQUENT_INTERVAL` | The measurement interval to optimize gain during the subsequent period (in seconds) | `86400` |
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| `READSB_AUTOGAIN_LOW_PCT` | If the percentage of "strong signals" (stronger than 3dBFS RSSI) is below this number, gain will be increased | `0.5` |
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| `READSB_AUTOGAIN_HIGH_PCT` | If the percentage of "strong signals" (stronger than 3dBFS RSSI) is above this number, gain will be decreased | `7.0` |
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| `READSB_AUTOGAIN_LOW_PCT` | If the percentage of "strong signals" (stronger than 3dBFS RSSI) is below this number, gain will be increased | `2.5` |
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| `READSB_AUTOGAIN_HIGH_PCT` | If the percentage of "strong signals" (stronger than 3dBFS RSSI) is above this number, gain will be decreased | `6.0` |
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If you need to reset AutoGain and start over determining the gain, you can do so with this command:
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@ -11,6 +11,7 @@
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READSB_AUTOGAIN_INITIAL_INTERVAL="${READSB_AUTOGAIN_INITIAL_INTERVAL:-300}"
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READSB_AUTOGAIN_SUBSEQUENT_INTERVAL="${READSB_AUTOGAIN_SUBSEQUENT_INTERVAL:-86400}"
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READSB_AUTOGAIN_INITIAL_TIMEPERIOD="${READSB_AUTOGAIN_INITIAL_TIMEPERIOD:-7200}"
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if [[ "${READSB_GAIN,,}" != "autogain" ]]; then
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# Autogain is not enabled, so let's do nothing forever
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@ -26,8 +27,8 @@ mkdir -p /var/globe_history/autogain
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# Do special things if it's the first time AUTOGAIN is running
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if [[ ! -f /var/globe_history/autogain/autogain_initialized ]]; then
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# run autogain every $READSB_AUTOGAIN_INITIAL_INTERVAL minutes for 90 minutes
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for (( i=0; i<$((5400/READSB_AUTOGAIN_INITIAL_INTERVAL)); i++ ))
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# run autogain every $READSB_AUTOGAIN_INITIAL_INTERVAL secs (default 5 mins) for $READSB_AUTOGAIN_INITIAL_TIMEPERIOD secs (default 2 hours)
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for (( i=0; i<$(( READSB_AUTOGAIN_INITIAL_TIMEPERIOD / READSB_AUTOGAIN_INITIAL_INTERVAL )); i++ ))
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do
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sleep "$READSB_AUTOGAIN_INITIAL_INTERVAL" # sleep first to give readsb the opportunity to collect some initial data
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/usr/local/bin/autogain1090 2>&1 | mawk -W Interactive '{print "[autogain] " $0}'
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@ -1,8 +1,8 @@
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#!/usr/bin/with-contenv bash
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# shellcheck shell=bash
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low="${READSB_AUTOGAIN_LOW_PCT:-0.5}"
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high="${READSB_AUTOGAIN_HIGH_PCT:-7.0}"
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low="${READSB_AUTOGAIN_LOW_PCT:-2.5}"
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high="${READSB_AUTOGAIN_HIGH_PCT:-6.0}"
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ga=(0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6 -10)
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tmp=/var/globe_history/autogain
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mkdir -p $tmp
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