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Predicting the Visibility of LEO Satellites I. Ali, N. AlDhahir and J.E. Hershey P r e d i c t i n g t h e V i s i b i l i t y o f LEO S a t e l l i t e s

Summary: Predicting the Visibility of LEO Satellites I. Ali, N. Al­Dhahir and J.E. Hershey
P r e d i c t i n g t h e V i s i b i l i t y o f LEO S a t e l l i t e s
Irfan Ali Naofal Al­Dhahir John E. Hershey
aliirfan@crd.ge.com aldhahir@crd.ge.com hershey@crd.ge.com
KW C524 KW C405 KW C 421
General Electric Corporate Research and Development
1 Research Circle, Niskayuna NY 12309.
In this paper, we present a simple algorithm to determine the visibility­time
function of a circular low earth orbit (LEO) satellite at a given location on earth's
surface. Two simplifications are used to derive the algorithm. First, in the mobile
terminal's frame of reference, i.e., in the earth centered fixed (ECF) coordinate
frame, the orbit of the satellite during the visibility window is approximated by a
great circle arc. Second, an analytic approximation relating the observed
maximum elevation angle during the visibility window to the duration of visibility
window, derived in [5], is used. We illustrate the accuracy of the algorithm by
numerical examples.
1 Introduction
A variety of LEO satellite systems have recently been proposed for personal communications[1]. In these


Source: Al-Dhahir, Naofal - Department of Electrical Engineering, University of Texas at Dallas


Collections: Engineering