| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and a device for reducing code shift search for rapidly acquiring a satellite signal. <P>SOLUTION: According to one embodiment of this application, a global positioning system (GPS) receiver is integrated with a transceiver capable of communicating with a cellular or PCS network via the air-interface particular to that network. Standard information provided by the network is used to assist the integrated GPS receiver and improve its sensitivity and latency. The result of this improvement is that the receiver can rapidly acquire a satellite and compute its position in environments where conventional, stand-alone GPS receivers cannot. This added performance is very important for the emergency location application, since the user may have high expectations for personal safety in a variety of situations. Furthermore, the rapid acquisition reduces power consumption, which is very important for battery-powered devices utilizing such combined GPS and cellular technologies. <P>COPYRIGHT: (C)2004,JPO |
