Can anybody explain how a sattelite in the sky can tell how far I've moved on the ground? I don't understand.
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Triangulation (sp?).
The GPS receiver takes the signals (a time-stamp) from 4 (i think) or more satellites and determines your position. It then repeats and interprets the difference as motion.
I think that is the basics of it, but I could be wrong.
The GPS receiver takes the signals (a time-stamp) from 4 (i think) or more satellites and determines your position. It then repeats and interprets the difference as motion.
I think that is the basics of it, but I could be wrong.
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Good post MB. Explains GPS in simple English and makes sense. I thought I found a mistake with my GPS unit a couple of weeks ago when I was thinking it shorted me a little on a marked 5 mile course. Not quite. As I found out the next week the particular course is not marked correctly and the longer I ran it the greater the discrepancy between my GPS and the markers. The GPS was correct.
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I've been told the government skews the signals at times to intentionally introduce errors. I have a job where I park in the same spot every day and sometimes it would show me as much as 100 feet from the spot where I really am. The satellites were used by the military when they have some critical operation going on they don't want others to have the real accuracy they are capable of. I think the guy who told me that may be right as there would often be news reports of military operations soon after. Also there would often be a lot of AF tanker activity at the same time. I live near a tanker base.
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