The global positioning satellite (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. In the field of mobile telephone communication, it is gradually popular to use in a mobile telephone system a GPS unit capable of receiving GPS information transmitted from a GPS satellite and including time information, position information, and map information. This arises from a demand for applications in case where a user of a mobile telephone apparatus sends an emergency report via radio communication and another party involved in communication desires to identify a user's position or in case where another party searches the position of a possessor of a mobile phone apparatus. There is also a demand for an application such that a user of a mobile telephone apparatus desires to acquire map information of his location for the sake of convenience. 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. GPS receivers determine location, velocity, and time by receiving and processing information in GPS signals received from GPS satellite. The GPS signal from each satellite carries data for the location-in-space of the satellite and time-of-transmission on carrier frequencies that are the same for all the satellites. The data from each satellite is spread with a pseudo-random noise code that is distinct for that satellite.
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