GPS cell phone
Cellular telephony has been designed to permit a wireless device to send date and or voice messages over a wireless communications network providing the device is able to transmit its device identification codes appropriate to the network on which it is attempting to transmit. Global positioning system (GPS) is a satellite-based radio navigation, positioning and time transfer system that provides highly accurate navigational information on a continuous global basis to an unlimited number of properly-equipped users. The GPS system consists of a constellation of low earth orbiting satellites that transmit signals in accordance with a highly accurate onboard clock. Signals received from four satellites by a receiver located on or near the surface of the earth are triangulated to provide a fix on location of the receiver. GPS receivers normally determine their position by computing time delays between transmission and reception of signals transmitted from satellites and received by the receiver on or near the surface of the earth. The time delays multiplied by the speed of light provide the distance from the receiver to each of the satellites that are in view of the receiver. Cell phones can be provided with an integrally mounted GPS receiver powered by the cell phone battery, the purpose of which is to detect position and to report position to a dispatcher or other type of office through the utilization of the cellular network.
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