Those who have the means and interest to download 21.5 megabytes might want to get the following, which is both an orbital mechanics primer and a discussion of techniques NASA uses to do orbit determination. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19910072959_1991072959.pdf Goddard Trajectory Determination System (GTDS) mathematical theory, revision 1 Long, A. C.; Cappellari, J. O., Jr.; Velez, C. E.; Fuchs, A. J. NASA Center for AeroSpace Information (CASI) NASA-CR-183462; NAS 1.26:183462; FDD/552-89/001-REV-1; CSC/TR-89/6001-REV-1 , 19890701; Jul 1, 1989 Accession ID: 91N70514 Document ID: 19910072959 Updated/Added to NTRS: 2004-11-03 ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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