Eldartford
Thanks for the correction, this is too funny...I work on the defense industry too. I guess I was guilty of making yet ANOTHER approximation by saying it's eliptical.
I have never worked on Guidance Systems for Ballistic Missiles, although I've worked on tracking problems before. I work mostly on image processing, and pattern recognition(ATR)...I love the subject of Fuzzy Pattern Recognition(I also like Neural Network theory) but no one in the industry seems to give a damn about it...