160 lines
3.8 KiB
Perl
Executable file
160 lines
3.8 KiB
Perl
Executable file
#!/usr/bin/perl
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########################################################################
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# Convert DAFIFT NAV.TXT to FlightGear format.
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########################################################################
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use strict;
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my @TYPES = (
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'', # Unknown
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'V', # VOR
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'V', # VORTAC
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'D', # TACAN
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'V', # VOR/DME
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'N', # NDB
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'',
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'N', # NDB/DME
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'',
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'D' # DME
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);
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my @TYPE_NAMES = (
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'',
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'VOR',
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'VORTAC',
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'TACAN',
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'VOR/DME',
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'NDB',
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'',
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'NDB/DME',
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'',
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'DME'
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);
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my @HAS_DME = (
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'N', # Unknown
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'N', # VOR
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'Y', # VORTAC
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'Y', # TACAN
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'Y', # VOR/DME
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'N', # NDB
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'N',
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'Y', # NDB/DME (not used, though)
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'N',
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'Y' # DME
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);
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# Make a frequency from a DME channel
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sub make_freq {
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my ($type, $channel) = (@_);
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my $offset = 0;
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$offset = 0.05 if ($channel =~ /Y$/);
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if ($channel < 67) {
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return 108 + (($channel - 17)/10.0) + $offset;
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} else {
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return 112 + (($channel - 67)/10.0) + $offset;
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}
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}
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# Make a range based on navaid type and purpose
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sub make_range {
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my ($type, $usage) = (@_);
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if ($type == 1 || $type == 2 || $type ==4) { # VOR
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if ($usage == 'H' || $usage == 'B') {
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return 200;
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} elsif ($usage == 'T') {
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return 20;
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} else {
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return 50;
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}
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} elsif ($type == 3 || $type == 7) { # DME
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if ($usage == 'T') {
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return 50;
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} else {
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return 200;
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}
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} else { # NDB
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if ($usage == 'T') {
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return 50;
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} else {
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return 200;
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}
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}
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}
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sub write_navaid {
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my ($type, $lat, $lon, $elev, $freq, $range, $dme, $id, $magvar, $name)
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= (@_);
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printf("%s %10.6f %11.6f %6d %7.2f %4d %s %-4s %s %s %s\n",
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$TYPES[$type], $lat, $lon, $elev, $freq, $range, $dme, $id,
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$magvar, $name, $TYPE_NAMES[$type]);
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}
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sub make_dmagvar {
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my($coord) = shift;
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my( $value );
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my( $dir, $deg, $date ) = $coord =~ m/^([EW])(\d\d\d\d)(\d\d\d\d)/;
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$value = $deg / 10.0;
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if ( $dir eq "W" ) {
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$value = -$value;
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}
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return $value;
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}
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<>; # skip header line
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print "// FlightGear navaid data, generated from DAFIFT NAV.TXT\n";
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while (<>)
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{
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chop;
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my @F = split(/\t/);
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my $type = $F[1];
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if ($TYPES[$type] eq '') {
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warn("Bad type for " . $F[0] . "(" . $F[5] . ")\n");
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next;
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}
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my $lat = $F[18];
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my $lon = $F[20];
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my $elev = $F[23];
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my $freq = $F[8]/1000;
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if ($type == 3 || $type == 9) {
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$freq = make_freq($type, $F[10]);
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}
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my $range = 0 + $F[14];
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if ($range == 0) {
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$range = make_range($type, $F[9]);
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}
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my $id = $F[0];
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my $magvar = $F[21];
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if ($magvar eq '') {
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$magvar = 'XXX';
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} else {
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my $tmp = make_dmagvar( $magvar );
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# print "$magvar $tmp\n";
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if ( $tmp <= 0 ) {
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$magvar = sprintf("%02.0fW", -$tmp );
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} else {
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$magvar = sprintf("%02.0fE", $tmp );
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}
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}
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my $name = $F[5];
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if ($type == 7) { # NDB/DME
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write_navaid(9, $lat, $lon, $elev, make_freq(9, $F[10]), $range,
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'Y', $id, $magvar, $name);
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$type = 5;
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}
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write_navaid($type, $lat, $lon, $elev, $freq, $range,
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$HAS_DME[$F[1]], $id, $magvar, $name);
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}
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print "[End]\n";
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# end of dafif2fix.pl
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