Simplified perturbations models are a set of five mathematical models (SGP, SGP4, SDP4, SGP8 and SDP8) used to calculate orbital state vectors of satellites and space debris relative to the Earth-centered inertial coordinate system. This set of models is often referred to collectively as SGP4 due to the frequency of use of that model particularly with two-line element sets produced by NORAD and NASA.

Matlab\adbar2rv.m
......\angl.m
......\anglesdr.m
......\anglesg.m
......\anglesl.m
......\azl2radc.m
......\biellip.m
......\CeresHaccess.dat
......\checkhit.m
......\coe2rv.m
......\combined.m
......\constastro.m
......\constmath.m
......\convtime.m
......\cubic.m
......\cubicspl.m
......\cubicspl1.m
......\dayofwee.m
......\days2mdh.m
......\debug1.m
......\debug2.m
......\debug3.m
......\debug4.m
......\debug5.m
......\debug6.m
......\debug7.m
......\dms2rad.m
......\dolam.m
......\doubler.m
......\dpper.m
......\dscom.m
......\dsinit.m
......\dspace.m
......\ecef2eci.m
......\ecef2mod.m
......\ecef2pef.m
......\ecef2teme.m
......\ecef2tod.m
......\eci2ecef.m
......\eci2hill.m
......\eci2mod.m
......\eci2pef.m
......\eci2teme.m
......\eci2tod.m
......\ell2rv.m
......\eq2rv.m
......\ex10_1.m
......\ex10_2.m
......\ex10_3.m
......\ex10_4.m
......\ex10_5.m
......\ex11_1.m
......\ex11_3.m
......\ex11_4.m
......\ex11_5.m
......\ex1_1.m
......\ex2_2.m
......\ex2_4.m
......\ex2_5.m
......\ex2_6.m
......\ex3_1.m
......\ex3_1415.m
......\ex3_1415a.m
......\ex3_2.m
......\ex3_3.m
......\ex3_4.m
......\ex3_5.m
......\ex3_6.m
......\ex3_7.m
......\ex3_8.m
......\ex3_9.m
......\ex4_1.m
......\ex5_1.m
......\ex5_2.m
......\ex5_3.m
......\ex5_4.m
......\ex5_6.m
......\ex6_1.m
......\ex6_10.m
......\ex6_14.m
......\ex6_15.m
......\ex6_2.m
......\ex6_3.m
......\ex6_4.m
......\ex6_5.m
......\ex6_6.m
......\ex6_7.m
......\ex6_8.m
......\ex6_9.m
......\ex7_1.m
......\ex7_2.m
......\ex7_34.m
......\ex7_5.m
......\findatwaatwb.m
......\findc2c3.m
......\finddays.m
......\findtof.m
......\finitediff.m
......\fk4.m
......\fk4i.m

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