spaceway-ngso.tcl

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#
# Spaceway NGSO
#
# Zero phasing between planes, since an odd number of sats in planes
# 180deg opposed means that sats cross the other plane halfway between
# sats in that plane, which is ideal for coverage. Just like ICO.
#
# Source of information: Hughes Spaceway NGSO FCC filing, 22 December 1997.
# SaVi output can be compared to Figure C-1, p69, Appendix C.
#
# this script for SaVi 1.2, by Lloyd Wood ([e-mail])
# http://www.ee.surrey.ac.uk/Personal/L.Wood/constellations/
#
# $Id: spaceway-ngso.tcl,v 1.4 2004/12/26 14:47:20 lloydwood Exp $

set SATS_PER_PLANE 5
set NUM_PLANES 4

# setup orbital elements
set a [expr 10352.0+$RADIUS_OF_EARTH]
set e 0.0
set inc 55
set omega 0.0
set T_per [expr 2 * $PI * pow($a,1.5) / sqrt($MU)]

# elevation angle of 30 degrees
set coverage_angle 30.0

satellites GV_BEGIN
for {set j 0} {$j < $NUM_PLANES} {incr j} {
	set Omega [expr $j * 360.0 / $NUM_PLANES ]
	for {set i 0} {$i < $SATS_PER_PLANE} {incr i} {
		set T [expr $T_per * $i / $SATS_PER_PLANE ]
		satellites LOAD $a $e $inc $Omega $omega $T
	}
}
satellites GV_END