| 摘要 |
Systems and methods are described here for locating the position of a mobile terminal (MU) in a cellular communications system. A base station (1-1, 1-2, 1-3) in the cellular communication system broadcasts a communication signal having embedded therein a navigation signal. The navigation signal uses a chirp technique in which the chirp signal includes two portions, an up-chirp portion (4) and a down-chirp portion (5). Each portion of the chirp signal is synchronized with a frame in the communication signal. The chirp navigation signal is at a power level much lower than the communication signal so as not to interfere with the communication signal. A mobile terminal generates a corresponding chirp signal to correlate with the incoming signal and to extract the navigation signal. The mobile terminal uses the detected navigation signal to determine a time of arrival of the communication signal (54) for use in determining the position (58) of the mobile terminal (MU) either at the terminal (MU) or to send to a network center for location processing. There are disclosed spectrum position determination signal, a method of embedding two spread spectrum signals in a communication signal, a method of determining a location of a mobile wave, Preferably the communication signal is a Global System for Mobile Communications ((GSM). |
