Article: Time, position, and velocity? Just ask your GPS chip set. (Global Positioning System)

GPS is poised to invade everything from cellular phones to backpacks with new chip sets that implement a complete receiver using just two ICs plus memory. Chip-set prices, meanwhile, have hit the $30 mark, making GPS suitable in virtually any application that needs position data, including remote embedded applications that need only an accurate clock or calendar.

Using 24 satellites in orbit more than 10,000 miles above the earth, the Global Positioning System (GPS) implements a radio-navigation scheme that allows receivers to accurately determine time, 3-D position, and velocity. Whether you are working on the latest car-navigation system or on a custom embedded ...

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