+bones10 Posted February 24, 2006 Share Posted February 24, 2006 I've been curious about how ta heck this gps stuff works anyways. So here's what I already understand. The satelites all have atomic clocks and send out signals that have a time stamp in them (and the satellite position?). Then the GPS receiver can compare the current time with the time that signal was sent, and determine how far away the satellite is from the receiver. From this the gps can get a radius of possible possitions. With more satellite signals, the receiver can figure out the intersections of all these radii, and determine your position. So now I'm wondering how does the receiver get an accurate time to use for 'current time' for the comparison? A web site I read said that it gets the time from a gps satellite, but wouldn't that time be inaccurate by the time the receiver got that signal? So like, say, one of the gps satellites sends the 'current time' signal, wouldn't your gps then think you're right on top of the satellite (0 time shift from the satellite and 'current time')? Thanks for the help, - bones Quote Link to comment
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