| 摘要 |
A GPS receiver can periodically obtain range data without degrading the performance such as positioning sensitivity and positioning speed and conserve energy consumption. Supplied with IF data from a frequency conversion section 4, a synchronization hold section (6) acquires synchronization of a carrier frequency and phase synchronization of a C/A code, holds the acquired state, and obtains necessary information such as range data. When range data is obtained, a switch (23) is turned off to stop supplying the power to the synchronization hold section (6). A control section (7) executes a positioning operation using the obtained range data and the like, finds and outputs positioning information indicative of a current position. Thereafter, the switch (23) is turned on to restart the synchronization hold section (6). In this manner, control is provided to repeatedly start and stop the synchronization hold section (6). <IMAGE> |
