Hello all, this is slightly off the main interest of the mailing list, but I reckon you're probably the best sources of information. I'd like to calculate some visibility statistics for the GPS constellation. This means, I'd take my ephemerides files, or something of the kind, for the constellation, and then test if there is a line of sight between any satellite and a ground station. Eventually, I'd have to make provision for limiting the elevation angle, and for using the elipsoid (or geoid) rather than a sphere. Finally, I'd want to check if a given location is seen by a satellite that also sees the ground station. All this is rather complicated programming, which very likely someone has been kind enough to put on the public domain. Naturally, I'd have to do some adaptation, but it is still better than buying something like STK (which, by the way, I can't afford). I'd be very grateful to get some pointers on where to look, like code libraries, books with the algorithms and so on. Thanks! Renato ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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