| 摘要 |
PROBLEM TO BE SOLVED: To provide a system capable of position determination in a variety of wireless environments and using both a global satellite navigation system, such as a GPS system, and a wireless system deployed in a cellular configuration. SOLUTION: A SPS receiver receives SPS signals from at least one SPS satellite. The SPS receiver is coupled to and typically integrated with a communication system which receives and transmits messages in a cellular wireless system. A time measurement which represents a time of travel of a message in cell based communication signals between a cell based transceiver and the communication system is determined. A position of the SPS receiver is determined from a combination of at least the time measurement which represents the time of travel of the message in the cell based communication signals and a time measurement which represents a time of travel of the SPS signals. The cell based communication signals are capable of communicating data messages in a two-way direction between the cell based transceiver and the communication system. COPYRIGHT: (C)2010,JPO&INPIT |
