+#!/usr/bin/perl
+#
+# show/muf command
+#
+# Copyright (c) 1999 Dirk Koopman G1TLH
+#
+# $Id$
+#
+
+my ($self, $line) = @_;
+my ($prefix, $hr2) = split /\s+/, $line;
+return (1, $self->msg('e4')) unless $prefix;
+
+$hr2 = 2 if !$hr2 || $hr2 < 2;
+$hr2 = 24 if $hr2 > 24;
+
+my @out;
+
+# get prefix data
+my ($pre, $a) = Prefix::extract($prefix);
+
+# calc bearings and distance
+my ($d, $b1, $b2); # distance, bearing from TX and from RX
+my ($lat2, $lon2); # lats and longs in radians
+my $lat1 = $self->user->lat;
+my $lon1 = $self->user->long;
+if (!$lon1 && !$lat1) {
+ push @out, $self->msg('heade1');
+ $lat1 = $main::mylatitude;
+ $lon1 = $main::mylongitude;
+}
+$lat2 = $a->{lat};
+$lon2 = $a->{long};
+($b2, $d) = DXBearing::bdist($lat1, $lon1, $lat2, $lon2);
+($b1, undef) = DXBearing::bdist($lat2, $lon2, $lat1, $lon1);
+
+# convert stuff into radians
+$lat1 *= $d2r;
+$lat2 *= $d2r;
+$lon1 *= $d2r;
+$lon2 *= $d2r;
+$b1 *= $d2r;
+$b2 *= $d2r;
+$d = ($d / $R);
+
+my ($hr1, $day, $month) = (gmtime($main::systime))[2,3,4];
+$month++;
+my $flux = Geomag::sfi;
+my $ssn = Geomag::r || Minimuf::spots($flux);
+
+my $theta; # path angle (rad)
+my ($lats, $lons); # subsolar coordinates (rad)
+my $dB1 = 20; # transmitter output power (dBW)
+
+my $delay; # path delay (ms)
+my $psi; # sun zenith angle (rad)
+my ($ftemp, $gtemp); # my $temps
+my ($i, $j, $h, $n); # int temps
+my $offset; # offset for local time (hours)
+my $fcF; # F-layer critical frequency (MHz)
+my $phiF; # F-layer angle of incidence (rad)
+my $hop; # number of ray hops
+my $beta1; # elevation angle (rad)
+my $dhop; # hop great-circle distance (rad)
+my $height; # height of F layer (km)
+my $time; # time of day (hour)
+my $rsens = -123; # RX sensitivity
+
+
+my @freq = qw(1.8 3.5 7.0 10.1 14.0 18.1 21.0 24.9 28.0 50.0); # working frequencies (MHz)
+my $nfreq = @freq; # number of frequencies
+my @mufE; # maximum E-layer MUF (MHz)
+my @mufF; # minimum F-layer MUF (MHz)
+my @absorp; # ionospheric absorption coefficient
+my @dB2; # receive power (dBm)
+my @path; # path length (km)
+my @beta; # elevation angle (rad)
+my @daynight; # path flags
+
+# calculate hops, elevation angle, F-layer incidence, delay.
+$hop = int ($d / (2 * acos($R / ($R + $hF))));
+$beta1 = 0;
+while ($beta1 < $MINBETA) {
+ $hop++;
+ $dhop = $d / ($hop * 2);
+ $beta1 = atan((cos($dhop) - $R / ($R + $hF)) / sin($dhop));
+}
+$ftemp = $R * cos($beta1) / ($R + $hF);
+$phiF = atan($ftemp / sqrt(1 - $ftemp * $ftemp));
+$delay = ((2 * $hop * sin($dhop) * ($R + $hF)) / cos($beta1) / $VOFL) * 1e6;
+
+# print summary of data so far
+push @out, sprintf("RxSens: $rsens dBM SFI:%4.0lf R:%4.0lf Month: $month Day: $day", $flux, $ssn);
+push @out, sprintf("Power : %3.0f dBW Distance:%6.0f km Delay:%5.1f ms", $dB1, $d * $R, $delay);
+push @out, sprintf("Location Lat / Long Azim");
+push @out, sprintf("%-30.30s %-18s %3.0f", $main::myqth, DXBearing::lltos($lat1*$r2d, $lon1*$r2d), $b1 * $r2d);
+push @out, sprintf("%-30.30s %-18s %3.0f", $a->name, DXBearing::lltos($lat2*$r2d, $lon2*$r2d), $b2 * $r2d);
+my $head = "UT LT MUF Zen";
+for ($i = 0; $i < $nfreq; $i++) {
+ $head .= sprintf "%5.1f", $freq[$i];
+}
+push @out, $head;
+
+my $hour;
+
+# Hour loop: This loop determines the min-hop path and next two
+# higher-hop paths. It selects the most likely path for each
+# frequency and calculates the receive power. The F-layer
+# critical frequency is computed directly from MINIMUF 3.5 and
+# the secant law.
+
+$offset = int ($lon2 * 24. / $pi2);
+for ($hour = $hr1; $hour < $hr2+$hr1; $hour++) {
+ my $dh = $hour;
+ while ($dh >= 24) {
+ $dh -= 24;
+ };
+ $time = $dh - $offset;
+ $time += 24 if ($time < 0);
+ $time -= 24 if ($time >= 24);
+ my $out = sprintf("%2.0f %2.0f", $dh, $time);
+ $ftemp = Minimuf::minimuf($flux, $month, $day, $dh, $lat1, $lon1, $lat2, $lon2);
+ $fcF = $ftemp * cos($phiF);
+
+ # Calculate subsolar coordinates.
+ $ftemp = ($month - 1) * 365.25 / 12. + $day - 80.;
+ $lats = 23.5 * $d2r * sin($ftemp / 365.25 * $pi2);
+ $lons = ($dh * 15. - 180.) * $d2r;
+
+ # Path loop: This loop determines the geometry of the
+ # min-hop path and the next two higher-hop paths. It
+ # calculates the minimum F-layer MUF, maximum E-layer
+ # MUF and ionospheric absorption factor for each
+ # geometry.
+ for ($h = $hop; $h < $hop + 3; $h++) {
+
+ # We assume the F layer height increases during
+ # the day and decreases at night, as determined
+ # at the midpoint of the path.
+ $height = $hF;
+ $psi = Minimuf::zenith($d / 2, $lat1, $lon1, $b2, $b1, $lats, $lons);
+ if ($psi < 0) {
+ $height -= 70.;
+ } else {
+ $height += 30;
+ }
+ $dhop = $d / ($h * 2.);
+ $beta[$h] = atan((cos($dhop) - $R / ($R + $height)) / sin($dhop));
+ $path[$h] = 2 * $h * sin($dhop) * ($R + $height) / cos($beta[$h]);
+ Minimuf::ion($h, $d, $fcF, $ssn, $lat1, $lon1, $b2, $b1, $lats, $lons, \@daynight, \@mufE, \@mufF, \@absorp);
+ }
+
+ # Display one line for this hour.
+ $out .= sprintf("%5.1f%4.0f ", $mufF[$hop], 90 - $psi * $r2d);
+ $ftemp = $noise;
+ for ($i = 0; $i < $nfreq; $i++) {
+ $n = Minimuf::pathloss($hop, $freq[$i], 20, $rsens, 0, \@daynight, \@beta, \@path, \@mufF, \@mufE, \@absorp, \@dB2);
+ my $s = Minimuf::ds($n, $rsens, \@dB2, \@daynight);
+ $out .= " $s";
+ }
+ $out =~ s/\s+$//;
+ push @out, $out;
+}
+
+return (1, @out);
projects / spider.git / blobdiff