Base / Orbit Synchronization

[Hlynkacg]

I am currently working on refining my lunar lander's autopilot, and was wondering if anyone could help me work out the math behind BaseSync MFDs functionality.

As it stands I calculate my closest point of approach (CPA) by projecting the position of my target onto my own orbital plane. While this is method often "close enough" it only works for 1 orbit in advance and does not account for relative motion of the target or rotation of the reference body.

There has to be a more precise way, but I am unsure where to start.

 

[boogabooga]

Have you seen this:
http://www.orbiter-forum.com/showthread.php?t=36034

 

[fred18]

I did once (it is buried in some old pc) the code that allows to plot groundtracks, it was really precise, I can dig to find it, would that be helpful?

 

[Hlynkacg]

Have you seen this?

No I hadn't and I'm kind of surprised that it didn't show up in my search for "BaseSync", "BaseSync math", or "BaseSync principles".

Thank you, that should be a great help.

I did once (it is buried in some old pc) the code that allows to plot groundtracks, it was really precise, I can dig to find it, would that be helpful?

It could be helpful, but don't trouble yourself on my account. I think boogabooga may have provided the solution :tiphat: