High Quality Content by WIKIPEDIA articles! High Sensitivity GPS receivers use large banks of correlators and digital signal processing to search for GPS signals very quickly. This results in very fast times to first fix when the signals are at their normal levels, for example outdoors. When GPS signals are weak, for example indoors, the extra processing power can be used to integrate weak signals to the point where they can be used to provide a position or timing solution. GPS signals are already very weak when they arrive at the Earth’s surface. The GPS satellites have transmitters that only deliver 27 W from a distance of 20,200 km in orbit above the Earth. By the time the signals arrive at the user's receiver, they are typically as weak as –160 dBW, equivalent to one tenth of a millionth billionth of a watt.

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