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    Default Understanding the SGP4 algorithm



    Hi,
    I am working on the SGP4 orbit determination algorithm, so that I can write a program for it in C.
    I came across the Spacetrack Report #3 which gives the FORTRAN code listing for SGP4 algorithm.
    Now, this report has listed a set of calculations to be carried out (in the same sequence as given in the report), to find the satellite's position and velocity at any given time. What I could do is, write a C code that carries out these calculations in the given sequence without bothering to understand the physics behind the calculations. As a programmer, I could well treat those calculations as a black box.The problem with this is, I won't be in a position to rectify the errors that might come up in the code.

    So, I wish to do the following things before getting down to the coding:
    1.Comprehend the math given in Spacetrack Report #3.
    2.Understand Orbital mechanics that lead to those calculations.

    Also, I would like to understand how exactly the SGP4 algorithm works. What I wish to know is this- which part of the algorithm is responsible for what. The report does not explain all this. All it does is, give a set of calculations and a FORTRAN code that implements them.
    I wish to understand why the algorithm is the way it is.

    Can anyone please help me achieve these goals?
    Thank you in anticipation.

    Regards,
    Sanjeev.

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    OzMaz's Avatar
    OzMaz is offline White Dwarf
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    Default Re: Understanding the SGP4 algorithm

    Hi Sanjeev,
    I too am working on using SGP4 on an Arduino and have it all going except for the Azimuth values, they go a bit strange at extreme elevations.

    If you want to know all about the algorithm I suggest you by the book fundamentals of astrodynamics and applications by david vallado, it explains everything, after all he was one of the original authors.

    Good luck.

 

 

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