Signal receiver for position finding

Abstract

Provided is a signal receiving device for position measurement, which includes: an intermittent action control mechanism, which keeps the RTC unit (11) in constant action, directly changes the action of the TCXO (4) to a stop state only within a specified stop time, and After the stop time expires, the intermittent operation of returning from the above stop state is repeated; the count ratio determining mechanism calculates the number of counts of the clock signal of the TCXO (4) and the RTC unit (11) within a predetermined time before the above stop time The count ratio of the number of counts of the clock signal; the reference clock count value insertion mechanism, which calculates the clock signal of the TCXO within the above-mentioned stop time from the above-mentioned count ratio and the count number of the RTC part (11) within the above-mentioned stop time and insert the clock of the TCXO at the end of the above stop time with the above number of analog counts. Intermittent operation is performed with less power consumption than before, and positioning can be quickly performed after recovery from a stop state.

Description

technical field [0001] The present invention relates to a signal receiving device for position measurement which receives a plurality of signals for position measurement and measures the position of a receiving point. Background technique [0002] In a positioning signal receiving device such as a conventional GPS receiving device, radio waves transmitted from a plurality of positioning satellites are received, and the GPS time and, The position of each positioning satellite, the simulated distance between each positioning satellite and the receiving point, and the positioning system time are also obtained from the position of each positioning satellite and the simulated distance to the receiving point. [0003] In the above-mentioned GPS receiving device, although the position measurement is usually continued directly after the power is turned on in use, for example, a portable positioning device using a small-capacity battery as a power source, or a solar cell and a second...

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