More than 35 years have passed since some of us were fortunate enough to play a role in the design of GPS. Predecessor systems and designs, such as Transit, Timation, 621B, DNSS, and atomic clocks provided some of its foundations. Considered at first by some as a useless adventure of some technologists with little knowledge of real navigation, GPS has now become a household word and has many millions of users, mostly civilian, in aircraft, ships, surveying, construction, and most of all, cell phones and automobiles ( such as rearview mirror GPS, mirror GPS ). Assisted GPS (A-GPS) is one of the major contributors to the widespread use of GPS, especially for cell phones and other handheld units. A-GPS integrates GPS and communications, especially wireless and utilizes GPS chips with added low-cost processing power and many thousands of correlators. GPS satellites are limited in the amount of power they can provide to users on the ground many thousands of miles away. A-GPS provides important information, by means of these separate wireless communications channels, to substantially improve the processing power of the GPS receiver, so that they can operate successfully in disadvantaged locations and circumstances where buildings, trees, hills may partially degrade the GPS signals.
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