satvis.m

航天工程工具箱

function [phi,s]=satvis(el0,R,h)
%SATVIS  Visibility of satellite.
%   [PHI,S]=SATVIS(EL0,R,H) gives the visibility of the satellite
%   in terms of angle from base station with respect to Earth centre
%   at a distance R from the surface. EL0 is the minimum elevation angle
%   with respect to the horizon plane of a satellite at altitude H.
%   S is the distance from base station along the earth surface to the
%   subsatellite point where the limit of visibility occurs.
%
%   See also ORB2CART, MSATTRACK.

% Copyright (c) 2003-04-03, B. Rasmus Anthin.

phi=acos(R/(R+h)*cos(el0))-el0;
s=R*phi;