autoatp

#!/bin/bash
 
#autoatp v0.2
#Shawn Somers, K7ATA, shawn@busymarvin.net
#Jessica Litwin, jkl@thegeekgroup.org
#
#
# TO USE: autatp satellite
# this will start an infinite loop of ATP download and decode for a given NOAA weather satelite
#
# viable options are: NOAA-15 NOAA-18 NOAA-19
#
#
# external requirements are: rtl_fm, atpdec, timeout, at, sox, predict
#
#tried to keep the external requirements as minimal as possible

# change this path to wherever ou want the audio and image files saved to. You MUST have rw perms for this path!
outpath="/home/shawn/sat/"

#full path to where atpdec is located. exclude the trailing slash!
decpath="/home/shawn/sat"

#PPM frequency error correction
#rtlsdr gain
ppm="-44"
gain="25"

# capture blank input
if [ $# -gt 1 ]; then
	echo "No satelite selected!!!"
	echo "usage: ./autoatp NOAA-15 (or NOAA-18 or NOAA-19)" 
	exit 0
fi

#use predict to generate teh next pass times for the chosen bird
#generate all of the dates & times that we'll need

get_bird_times()
{ 
set +o posix
 
readarray -t arr <<< "$(/usr/bin/predict -p $1 | sed -n '1p;$p' | awk '{print $1}')";
let plusten="${arr[1]} + 1200"; 
start_date="$(date -d @${arr[0]} +'%H:%M %m/%d/%y' )";
end_date="$(date -d @${arr[1]} +'%H%M %m/%d/%y' )";
proc_date="$(date -d @${plusten} +'%H:%M %m/%d/%y' )";
file_date="$(date -d @${arr[0]} +'%H_%M_%m_%d_%y' )";
let "elapsed_time = ${arr[1]} - ${arr[0]}";
 
#echo "start: ${arr[0]}: $start_date";
#echo "  end: ${arr[1]}: $end_date";
#echo "  proc: ${arr[1]}: $proc_date";
#echo "     time elapsed: $(date -u -d @${elapsed_time} +\"%T\")";
}

get_bird_times $1


#set the radio frequencies that rtl_fm will need, based on bird
case $1 in
NOAA-15)
bird_freq="137.6200M";
;;
NOAA-18)
bird_freq="137.9125M";
;;
NOAA-19)
bird_freq="137.1000M";
;;
esac;

#because at wont let us use seconds, lets add a minute, so that we're sure we dont cut off the end of a pass
elapsed_time2=$((elapsed_time+60))

#lest set our output filename for tha audio
outfile="$outpath$file_date.wav"

#test variables for validation
#echo $1
#echo $start_date $elapsed_time $elapsed_time2 $bird_freq $outfile

#building our commands
#this long mess is how we record the satelite at the propper time and duration
#record_command="echo \"timeout $elapsed_time2 /usr/bin/rtl_fm -g $gain -p $ppm -f $bird_freq -s 11025 - | sox -t raw -e signed -c1 -b16 -r 11025 - $outfile\" | at $start_date"
record_command="echo \"timeout $elapsed_time2 /usr/bin/rtl_fm -g $gain -p $ppm -r 32k -f $bird_freq -s 34816 - | sox -t raw -e signed -c1 -b16 -r 11025 - $outfile\" | at $start_date"

echo $record_command

#this command is where we make pretty pictures (assuming that we recorded a good signal!)
proc_command1="echo \"$decpath/atpdec -i r -d $outpath $outfile \" | at $proc_date"
proc_command2="echo \"$decpath/atpdec -i a -d $outpath $outfile \" | at $proc_date"
proc_command3="echo \"$decpath/atpdec -i b -d $outpath $outfile \" | at $proc_date"
proc_command4="echo \"$decpath/atpdec -i c -d $outpath $outfile \" | at $proc_date"
proc_command5="echo \"$decpath/atpdec -i t -d $outpath $outfile \" | at $proc_date"


#and finally, this one will start the whole process over again after teh current pass is complete!
reset_command="echo \"$dec_path/autoatp $1 \"| at $proc_date"


#here is where we ACTUALLY do all the work. 
(eval "$record_command")
(eval "$proc_command1")
(eval "$proc_command2")
(eval "$proc_command3")
(eval "$proc_command4")
(eval "$proc_command5")
#(eval "$reset_command")

exit