Lightning Talk: Where the Heck Am I? Understanding Location in your Application
summary
Explains how global positioning actually produces a coordinate: a constellation of 24 satellites at 20,000 km broadcasts ephemeris and almanac so a receiver finds satellites, reads positions, measures distance by signal time, and trilaterates a fix — which requires a four-satellite fix because phone clocks are not atomic and introduce a common offset solved only with the fourth satellite. Notes practical details: ephemeris can take 12 minutes to download (AGPS avoids that), relativity corrections matter, multipath and ionospheric delay make real-world accuracy about ≈5 m.
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