script to output all frequencies for an airport as well as frequencies of
nearby radio navigation facilities and their distance/bearing to the airport
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mfranz
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302
scripts/tools/freq
Executable file
302
scripts/tools/freq
Executable file
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#!/usr/bin/perl -w
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# $Id$
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# Melchior FRANZ <mfranz#aon:at> Public Domain
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#
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# Usage: $ freq [IACO:ksfo [RANGE:15]]
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#
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# Examples: $ freq
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# $ freq ksjc
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# $ freq ksjc 30
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#
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# The RANGE is in km and defines which NDB, VOR, VORTAC, ... to
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# display. Default is 15 km.
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#
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# Note that the directions given for NDB, VOR, VORTAC, ... are
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# always the heading from this radio facility to the airport!
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use strict;
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use POSIX qw(ceil floor);
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my $ID = shift || "KSFO";
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my $RANGE = shift || 15; # for NDB/VOR [km]
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my $FG_ROOT = $ENV{'FG_ROOT'} || "/usr/local/share/FlightGear";
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my $APTFILE = "$FG_ROOT/Airports/apt.dat.gz" || die "airport file not found";
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my $NAVFILE = "$FG_ROOT/Navaids/nav.dat.gz" || die "nav file not found";
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$ID = uc($ID);
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my $PI = 3.1415926535897932384626433832795029;
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my $D2R = $PI / 180;
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my $R2D = 180 / $PI;
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my $ERAD = 6378138.12;
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my %COLOR = (
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'NONE' => "\033[m",
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'DME' => "\033[34;1",
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'ILS' => "\033[33;1m",
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'TWR' => "\033[31;1m",
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'ATIS' => "\033[32;1m",
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'NDB' => "\033[36;1m",
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'VOR' => "\033[35;1m",
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);
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my $USECOLOR = 1;
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my %FREQ;
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my $aptdatacnt = 0;
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my $aptlat = 0;
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my $aptlon = 0;
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open(F, "gzip -d -c $APTFILE|") or die "can't open airport file $APTFILE";
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while (<F>) {
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if (/^1\s+\S+\s+\S+\s+\S+\s+$ID\s+(.+)\s+/) {
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my $title = "$ID - $1";
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print "$title\n";
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print "=" x length($title) . "\n";
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foreach (<F>) {
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chomp;
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last if /^\s*$/;
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if (/^1.\s+(\S+)\s+(\S+)\s+/) {
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my ($lat, $lon) = ($1, $2);
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map { s/^(-?)0+/$1/ } ($lat, $lon);
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$aptlat += $lat;
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$aptlon += $lon;
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$aptdatacnt++;
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} elsif (/^(5\d+)\s+(\d+)\s+(.*)\s*/) {
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my ($id, $freq, $desc) = ($1, $2, $3);
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$freq =~ s/(..)$/.$1/;
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&addfreq($freq, $desc);
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}
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}
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last;
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}
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}
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close F or die "can't close airport file $APTFILE";
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die "no data for $ID" unless $aptdatacnt;
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# calculate mean location from all structures on the airport
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$aptlat /= $aptdatacnt;
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$aptlon /= $aptdatacnt;
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my ($aptx, $apty, $aptz) = &ll2xyz($aptlat, $aptlon);
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my @OM;
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my @MM;
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my @IM;
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my @NDB;
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my @VOR;
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my @DME;
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my @OTHERS;
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open(F, "gzip -d -c $NAVFILE|") or die "can't open airport file $NAVFILE";
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while (<F>) {
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chomp;
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if (/^2\s/) { # NDB
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my @l = split /\s+/, $_, 9;
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map { s/^(-?)0+/$1/ } @l[1,2];
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my $dist = &coord_dist_sq(&ll2xyz($l[1], $l[2]), $aptx, $apty, $aptz);
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push @NDB, [$dist, @l];
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} elsif (/^3\s/) { # VOR/VOR-DME/DME/VORTAC/TACAN
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my @l = split /\s+/, $_, 9;
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map { s/^(-?)0+/$1/ } @l[1,2];
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my $dist = &coord_dist_sq(&ll2xyz($l[1], $l[2]), $aptx, $apty, $aptz);
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if ($l[8] =~ /\b(VOR|VOR-DME)$/) {
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push @VOR, [$dist, @l];
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} elsif ($l[8] =~ /\bDME\b/) {
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push @DME, [$dist, @l];
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} else {
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push @OTHERS, [$dist, @l];
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}
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} elsif (/^(4|5)\s/) { # LLZ
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my @l = split /\s+/, $_, 11;
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next unless $l[8] eq $ID;
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$l[4] =~ s/(..)$/.$1/;
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&addfreq($l[4], "LLZ " . $l[9]);
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} elsif (/^6\s/) { # GS
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my @l = split /\s+/, $_, 11;
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next unless $l[8] eq $ID;
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$l[4] =~ s/(..)$/.$1/;
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&addfreq($l[4], "GS " . $l[9]);
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} elsif (/^7\s/) { # OM
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my @l = split /\s+/, $_, 11;
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next unless $l[8] eq $ID;
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push @OM, $l[9];
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} elsif (/^8\s/) { # MM
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my @l = split /\s+/, $_, 11;
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next unless $l[8] eq $ID;
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push @MM, $l[9];
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} elsif (/^9\s/) { # IM
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my @l = split /\s+/, $_, 11;
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next unless $l[8] eq $ID;
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push @IM, $l[9];
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} elsif (/^12\s/) { # DME (ILS)
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my @l = split /\s+/, $_, 11;
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next unless $l[8] eq $ID;
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$l[4] =~ s/(..)$/.$1/;
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&addfreq($l[4], "DME " . $l[9]);
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}
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}
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close F or die "can't close airport file $NAVFILE";
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foreach my $freq (sort { $a <=> $b } keys %FREQ) {
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my %h;
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map { $h{$_} = 1 } @{$FREQ{$freq}};
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my @uniq = keys %h;
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my @desc;
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my %rwy;
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foreach my $d (@uniq) {
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if ($d =~ /(\S*)\s*(\d\d[LRC]?)\s*(\S*)/) {
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push @{$rwy{$2}}, ($1 . $3);
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} else {
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push @desc, $d;
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}
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}
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foreach my $r (keys %rwy) {
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push @desc, ((join "/", sort @{$rwy{$r}}) . " $r");
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}
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my $s;
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my $k = join ", ", @desc;
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if ($k =~ /\bTWR\b/) {
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$s = $COLOR{'TWR'};
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} elsif ($k =~ /\bATIS\b/) {
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$s = $COLOR{'ATIS'};
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} elsif ($k =~ /\b(GZ|LLZ)\b/) {
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$s = $COLOR{'ILS'};
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}
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$s .= sprintf "%-7s %s\033[m\n", $freq, join ", ", $k;
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print $s;
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}
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&printfreq(0, $COLOR{'NDB'}, @NDB);
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&printfreq(1, $COLOR{'VOR'}, @VOR);
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&printfreq(1, $COLOR{'DME'}, @DME);
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&printfreq(1, $COLOR{'NONE'}, @OTHERS);
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print " OM " . (join ", ", sort @OM) . "\n" if @OM;
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print " MM " . (join ", ", sort @MM) . "\n" if @MM;
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print " IM " . (join ", ", sort @IM) . "\n" if @IM;
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exit 0;
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sub printfreq($$$)
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{
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my $divfreq = shift; # divide frequency by 100?
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my $color = shift;
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foreach (sort { @{$a}[0] <=> @{$b}[0] } @_) {
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my @l = @{$_};
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my $dist = &distance($l[0]);
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my $dir = &llll2dir($l[2], $l[3], $aptlat, $aptlon);
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my $freq = $l[5];
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$freq =~ s/(..)$/.$1/ if $divfreq;
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printf "$color%-7s %s (\"%s\")\t-->\t%s km/%s nm @ %s (%s)$COLOR{'NONE'}\n",
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$freq, $l[9], $l[8],
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&round($dist, 0.1), # km
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&round($dist / 1.852, 0.1), # nm
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int $dir, &symdir($dir);
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next if $l[9] =~ /\b$ID\b/;
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last if $dist > $RANGE;
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}
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}
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sub addfreq($$)
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{
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my ($freq, $desc) = @_;
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push @{$FREQ{$freq}}, $desc;
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}
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sub distance($) # km
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{
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my $t = shift;
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return $ERAD * sqrt($t) / 1000;
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}
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sub round($)
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{
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my $i = shift;
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my $m = (shift or 1);
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$i /= $m;
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$i = $i - &floor($i) >= 0.5 ? &ceil($i) : &floor($i);
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$i *= $m;
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return $i;
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}
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sub llll2dir($$$$)
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{
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my $latA = (shift) * $D2R;
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my $lonA = (shift) * $D2R;
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my $latB = (shift) * $D2R;
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my $lonB = (shift) * $D2R;
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my $xdist = sin($lonB - $lonA) * $ERAD * cos(($latA + $latB) / 2);
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my $ydist = sin($latB - $latA) * $ERAD;
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my $dir = atan2($xdist, $ydist) * $R2D;
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$dir += 360 if $dir < 0;
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return $dir;
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}
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sub ll2xyz($$)
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{
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my $lat = (shift) * $D2R;
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my $lon = (shift) * $D2R;
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my $cosphi = cos $lat;
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my $di = $cosphi * cos $lon;
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my $dj = $cosphi * sin $lon;
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my $dk = sin $lat;
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return ($di, $dj, $dk);
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}
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sub xyz2ll($$$)
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{
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my ($di, $dj, $dk) = @_;
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my $aux = $di * $di + $dj * $dj;
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my $lat = atan2($dk, sqrt $aux) * $R2D;
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my $lon = atan2($dj, $di) * $R2D;
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return ($lat, $lon);
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}
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sub coord_dist_sq($$$$$$)
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{
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my ($xa, $ya, $za, $xb, $yb, $zb) = @_;
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my $x = $xb - $xa;
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my $y = $yb - $ya;
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my $z = $zb - $za;
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return $x * $x + $y * $y + $z * $z;
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}
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sub symdir($)
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{
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my $dir = shift;
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my @names = ("N", "NNE", "NE", "ENE", "E", "ESE", "SE", "SSE",
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"S", "SSW", "SW", "WSW", "W", "WNW", "NW", "NNW");
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my $nnames = scalar @names;
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my $idx = int($nnames * (($dir / 360) + (0.5 / $nnames)));
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if ($idx >= $nnames) {
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$idx = 0;
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}
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return $names[$idx];
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}
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