radiosonde_auto_rx/scan/rtlsdr_scan.pl

228 wiersze
6.3 KiB
Perl
Executable File

#!/usr/bin/env perl
use strict;
use warnings;
use POSIX qw(strftime);
## rs_detect.c return:
## #define DFM 2
## #define RS41 3
## #define RS92 4
## #define M10 5
## #define iMet 6
my $log_dir = "log";
my $utc = strftime('%Y%m%d_%H%M%S', gmtime);
print $utc, "UTC", "\n";
my $powfile = sprintf "log_power\.csv";
my $ppm = 54;
my $fos = 403200000 * ( 1 + $ppm/1000000 ); # 403.2MHz-Linie
my $scan_f1 = "400.6M";
my $scan_f2 = "405.9M";
my $line;
my @fields;
my $date;
my $time;
my $f1;
my $f2;
my $f;
my $step;
my @db;
my $i;
my $j;
my $peak = 0;
my $peak_start;
my $peak_end = 0;
my $freq;
my $ret;
my $inv;
my $dec;
my $wavfile;
my $filter;
my $breite = "";
my $rs;
my $WFM;
my $squelch;
my $snr = 6;
my @peakarray;
my $num_peaks;
print "[rtl_power: scan $scan_f1:$scan_f2]\n";
system("timeout 30 rtl_power -p $ppm -f $scan_f1:$scan_f2:800 -i20 -1 $powfile 2>/dev/null");
if ( $? == -1 ) {
print "Fehler: $!\n";
}
my $fh;
open ($fh, '<', "$powfile") or die "Kann '$powfile' nicht oeffnen: $!\n";
@peakarray = ();
my $num_lines = 0;
while ($line = <$fh>) {
$num_lines += 1;
chomp $line;
@db = split(",", $line);
$date = $db[0];
shift @db;
$time = $db[0];
shift @db;
$f1 = $db[0];
shift @db;
$f2 = $db[0];
shift @db;
$step = $db[0];
shift @db;
shift @db;
my $sum = eval join '+', @db;
my $mean = $sum / scalar(@db);
#printf "level: %.1f\n", $mean;
$squelch = $mean + $snr;
$peak = 0;
$peak_start = $peak_end = 0;
for ($j = 0; $j < scalar(@db)-1; $j++) {
if ($db[$j] > $squelch) {
if ($peak == 0) {
$peak_start = $f1 + $j*$step;
}
$peak = 1;
}
elsif ($peak > 0) {
if ($db[$j+1] <= $squelch) {
$peak_end = $f1 + ($j-1)*$step;
$peak = 0;
}
if ($peak_start < $peak_end) {
$freq = $peak_start + ($peak_end-$peak_start)/2;
if ( !($freq > $fos-1000 && $freq < $fos+1000) ) { ## 403.2MHz-Linie auslassen
push @peakarray, $freq;
}
}
}
}
}
close $fh;
if ($num_lines == 0) {
print "[reset dvb-t ...]\n";
reset_dvbt();
}
else {
$num_peaks = scalar(@peakarray);
for ($j = 0; $j < $num_peaks-1; $j++) {
if ($peakarray[$j+1]-$peakarray[$j] < 10e3) { # DFM peak-to-peak: 6kHz
push @peakarray, $peakarray[$j]+($peakarray[$j+1]-$peakarray[$j])/2;
}
elsif ($peakarray[$j+1]-$peakarray[$j] < 34e3) { # iMet peak-to-peak: 24kHz
push @peakarray, $peakarray[$j]+($peakarray[$j+1]-$peakarray[$j])/2;
}
}
print "[rtl_fm: detect/decode]\n";
for ($j = 0; $j < $num_peaks; $j++) {
$freq = sprintf "%.0f", $peakarray[$j];
eval {
local $SIG{ALRM} = sub {die "alarm\n"};
alarm 30; # beide Bandbreiten
print "\n$freq Hz: "; # detect ohne highpass 20
system("timeout 12s rtl_fm -p $ppm -M fm -s 15k -f $freq 2>/dev/null |\
sox -t raw -r 15k -e s -b 16 -c 1 - -r 48000 -t wav - 2>/dev/null |\
./rs_detect -s -z -t 8 2>/dev/null");
$ret = $? >> 8;
if (!$ret) { # mehr Bandbreite bei iMet
system("timeout 12s rtl_fm -p $ppm -M fm -s 36k -o 4 -f $freq 2>/dev/null |\
sox -t raw -r 36k -e s -b 16 -c 1 - -r 48000 -t wav - 2>/dev/null |\
./rs_detect -s -z -t 8 2>/dev/null");
$ret = $? >> 8;
}
alarm 0;
};
if ($@) {
die unless $@ =~ /alarm/;
reset_dvbt();
print "[reset dvb-t ...]\n";
}
if ($ret) {
if ($ret & 0x80) {
$inv = '-i';
$ret = - (0x100 - $ret); # obwohl ($ret & 0x80) = core dump
}
else { $inv = ''; }
$rs = "";
$WFM = "";
if (abs($ret) == 2) { $rs = "dfm"; $breite = "15k"; $dec = './dfm06 -vv --ecc'; $filter = "lowpass 2000 highpass 20"; }
if (abs($ret) == 3) { $rs = "rs41"; $breite = "12k"; $dec = './rs41ecc --ecc -v'; $filter = "lowpass 2600"; }
if (abs($ret) == 4) { $rs = "rs92"; $breite = "12k"; $dec = './rs92gps --vel2 -a almanac.txt'; $filter = "lowpass 2500 highpass 20"; }
if (abs($ret) == 5) { $rs = "m10"; $breite = "24k"; $dec = './m10x -vv'; $filter = "highpass 20"; }
if (abs($ret) == 6) { $rs = "imet"; $breite = "40k"; $dec = './imet1ab -v'; $filter = "highpass 20"; $WFM = "-o 4"; }
if ($inv) { print "-";} print uc($rs)," ($utc)\n";
$utc = strftime('%Y%m%d_%H%M%S', gmtime);
$wavfile = $rs."-".$utc."Z-".$freq."Hz.wav";
if ($rs) {
system("timeout 30s rtl_fm -p $ppm -M fm $WFM -s $breite -f $freq 2>/dev/null |\
sox -t raw -r $breite -e s -b 16 -c 1 - -r 48000 -b 8 -t wav - $filter 2>/dev/null |\
tee $log_dir/$wavfile | $dec $inv 2>/dev/null");
}
}
}
print "\n";
}
print "\n=\n";
## $snr: peak sensitivity: wenn zu niedrig, viele Kandidaten;
## wenn zu hoch, zu wenige (rs41 sendet nur 1/2 sek.
## andere Methoden:
## Fenster/Bandbreite aufsummieren/integrieren; Schwerpunkt;
## rtl-sdr IQ-Band: 1 Minute aufnehmen und dann analysieren/scannen.
##
## rs92: aktuellen (SEM) almanac.txt
## wenn brdc-emphemerides (-e) benutzt werden, darauf achten, dass diese
## aktuell sind, wenn ueber laengeren Zeitraum gescannt wird
##
## rs_detect.c und decoder: gleiche Polaritaet in read_bits_fsk(),
## am besten als gemeinsame include-Datei wav_audio.c
###################################################################################################
## http://askubuntu.com/questions/645/how-do-you-reset-a-usb-device-from-the-command-line
## usbreset.c -> reset_usb
sub reset_dvbt {
my @devices = split("\n",`lsusb`);
foreach my $line (@devices) {
if ($line =~ /\w+\s(\d+)\s\w+\s(\d+):\sID\s([0-9a-f]+):([0-9a-f]+).+Realtek Semiconductor Corp\./) {
if ($4 eq "2832" || $4 eq "2838") {
system("./reset_usb /dev/bus/usb/$1/$2");
}
}
}
}