| 摘要 |
A Global Positioning System (GPS) receiver is arranged to acquire synchronization of signals received from four GPS satellites in a short time with stability, within, for example a time taken to obtain an error frequency of an intermediate carrier signal during a power-on sequence . At least one of the GPS satellite signals needs to be in a synchronization hold state, its intermediate carrier frequency being known, the orbit information about that GPS satellite being stored in a storage section of the receiver, and the position and current time of the GPS receiver being known. Under these prerequisites, an intermediate carrier frequency error is computed from the intermediate carrier frequency, the position and velocity of the GPS satellite obtained from the orbit information and the current time, and the position of the GPS receiver. The intermediate carrier frequency is corrected by the computed intermediate frequency carrier error. Synchronization with signals received from other GPS satellites is thereby facilitated using the corrected intermediate carrier frequency. <IMAGE> |
