中文说明：%%%%%%%%%%%%%%SGP4简化版%
English Description：
%%%%%%%%%%%%%% SGP4 Simplified %%%%%%%%%%%%% tic clc; clear all; close all; % radiusearthkm - radius of the earth in km % xke - reciprocal of tumin % j2, j3, j4 - un-normalized zonal harmonic values % j3oj2 - j3 divided by j2 mu = 398600.5; %// in km3 / s2% mu - earth gravitational parameter mu =single(mu); radiusearthkm = 63