To do this, as well as provide a tool suitable for immediate use the program was written in a quasi-algebraic style. It is a treatise giving all the equations for solving the elliptic orbit and related problems. "The program was designed to be more than a mere listing to be blindly typed in and run. My reply to this myopic view was, and remains: Surprisingly when OSCAR10.BAS was published there were complaints that "filling Oscar News with programs was a waste of space" etc etc. The Astronomical Almanac is invaluable for checking calculations an annual, but useful for many years. 30.6 days Hath September documents date algorithms. Sun's Up is about modelling the Sun's position, and describes applications including illumination and eclipses. lines 2000-2210 of PROCsatvec) use only the first half page of this, skipping the long term perturbatory effects. SGP, the simplest model, runs to 4 pages of higher mathematics just to compute satellite position and velocity. Models for the Propagation of NORAD Element Sets documents five ways to use a set of keps properly.
#Space shuutle matertial element 3d v2 full
Fundamentals of Astrodynamics is a no-nonsense text that's full of insights, and is incredibly cheap. For general reading The Satellite Experimenter's Handbook is unsurpassed, and itself documents several hundred references. Additions include the Sun's position, eclipses, visibility, Sun angle, sub-satellite point, mode switching, date algorithms and direct range-rate calculations for doppler shift.Īlmost every publication to do with satellites has information about orbits and their properties. Old hands will recognise the coding style. To do so means essentially writing the whole program out anyway, and references are plentiful. I don't intend to provide 100% mathematical details. So for a long while I've been intending to re-publish these routines, but in their most up-to-date embodiment. The flavour of these suggests that a new generation of satellite enthusiasts is emerging and are rightly asking the old questions anew. In recent years or so my mail has featured more and more queries about tracking matters than was usual. When issued for the BBC micro the program acquired the name "PLAN10", and later "PLAN13", and it's been transcribed for several other machines including the IBM-PC and Commodore 64 etc. In time the program accumulated several other modules, with the mathematics described in interim O.N.
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It must have been popular, since for some while it was the most requested back issue of O.N., and has formed the basis of many other authors' software (for example SATSCAN, VECSAT and parts of RealTrak for the IBM-PC, !ArcTrack for the Archimedes, the SATTRACK III Antenna/Radio Controller and numerous private programs). In heavily commented style it documented the basic routines one needs to build up a satellite tracking program. In December 1983 OSCAR NEWS published my program listing "OSCAR10.BAS". PLAN-13 Satellite Position Calculation ProgramĪmsat-UK's Oscar News, 1990 Oct No.