1 files changed, 100 insertions, 0 deletions
diff --git a/src/cal/get_tle/check_tle.pl b/src/cal/get_tle/check_tle.pl
new file mode 100755
index 0000000..483692e
--- /dev/null
+++ b/src/cal/get_tle/check_tle.pl
@@ -0,0 +1,100 @@
+#!/usr/local/bin/perl
+use FileHandle;
+
+# ***************************************************
+# add_tle.pl
+# 
+# This Perl module will read in the latest five orbital elements
+# from the file five.tle (which was created by get_tle.pl) and
+# add any new orbital elements to the file FUSE.TLE.
+#
+# Author: Ed Murphy
+#
+# History:  Written  July 27, 1999
+#
+# ***************************************************
+
+# Define the file names.  old_maintle_filename is not actually opened,
+# but is used in a system call at the end of the program. 
+
+$maintle_filename = "/data1/fuse/calfuse/calfiles/FUSE.TLE";
+$outtle_filename = "check_tle.dat";
+
+# Open the files.
+open (TLE_MAINFILE, "<$maintle_filename") || die "Cannot open $maintle_filename";
+open (TLE_OUT, ">$outtle_filename") || die "Cannot open $outtle_filename";
+
+# Read the first two lines from the maintle file to get the date of the
+# most recent set of TLEs.  Save these lines for later output.
+while ($line1 = <TLE_MAINFILE>) {
+    $line2 = <TLE_MAINFILE>;
+    $line3 = <TLE_MAINFILE>;
+
+    &parse_lines;
+
+    &calculate_a0;
+    &calculate_orbs;
+
+    printf TLE_OUT "%7.3f %6.2f %6.2f %7.2f %6.2f %7.4f %6.2f %6.2f %8.6f\n",$day, $apogee, $perigee, $semiax, $raan, $incl, $mean_anom, $arg_perig, $eccen;
+
+}
+
+    close (TLE_MAINFILE);
+    close (TLE_OUT);
+
+### end of Perl script
+
+
+sub parse_lines {
+$year = substr($line2, 18, 2);
+$doy = substr($line2, 20, 3);
+$dayfrac = substr($line2, 23, 9);
+$day=$doy.$dayfrac;
+$epoch = $year.$doy.$dayfrac;
+$incl = substr($line3, 9, 8);
+$raan = substr($line3, 17,8);
+$eccen = substr($line3, 26, 7);
+$eccen = "0." . $eccen;
+$mean_mot = substr($line3, 52, 11);
+$mean_anom = substr($line3, 43, 8);
+$arg_perig = substr($line3, 34, 8);
+
+
+if ($year > 50) {
+    $year += 1900;
+} else {
+    $year += 2000;
+}
+
+$dayfrac = "0".$dayfrac;
+
+}
+
+sub calculate_a0 {
+
+$mu = 3.986005E5;
+$pi = 3.14159265358979;
+$radian = 0.0174532925200;
+
+$mm=2.0*$pi*$mean_mot/(24.0*60.0);
+$ke=0.74366916E-1;
+$k2=5.413080E-4;
+$a1=($ke/$mm)**(2.0/3.0);
+$inrad = $incl * $radian;
+
+$d1=3.0/2.0*$k2/($a1*$a1)*(3.0*cos($inrad)*cos($inrad)-1.0)/((1.0-$eccen*$eccen)**(3.0/2.0));
+$a0=$a1*(1.0-$d1/3.0-$d1*$d1-134.0/81.0*$d1*$d1*$d1);
+$d0=3.0/2.0*$k2/($a0*$a0)*(3.0*cos($inrad)*cos($inrad)-1.0)/((1.0-$eccen*$eccen)**(3.0/2.0));
+$semiax=$a0/(1-$d0)*6378.135;
+
+}
+
+sub calculate_orbs {
+
+$period = 60.0*24.0/($mean_mot/(1+$d0));
+$cax=$eccen*$semiax;
+$perigee=$semiax-$cax-6378.1;
+$apogee=$semiax+$cax-6378.1;
+
+}
+