Method and device for receiving GPS and clock correcting method

Abstract

The invention discloses a GPS receiver which comprises a radio frequency converter, an analog-to-digital converter, a signal processor and a frequency generator. The radio frequency converter is used for converting a GPS radio frequency signal into an analog GPS intermediate frequency signal; the analog-to-digital converter is used for converting the analog GPS intermediate frequency signal into a digital GPS intermediate frequency signal; the signal processor is used for converting the digital GPS intermediate frequency signal into an I component and a Q component; the frequency generator isused for providing local clocks for the radio frequency converter, the analog-to-digital converter and the signal processor; the signal processor respectively calculates the relevance of the I component and the Q component with a local pseudo-random code and corrects the local clocks by utilizing a time interval so as to obtain a clock error, wherein the time interval detects that the relevance is larger than a preset threshold value; the clock error is fed back to the frequency generator; and the frequency generator corrects the generated local clocks according to the clock error, thus the synchronization of the local clocks and a spaceborne clock can be realized.

Description

technical field [0001] The invention relates to the field of electronic circuit design, in particular to a global positioning system (GPS) receiving method and device and a clock correction method. Background technique [0002] The Global Positioning System (Global Positioning System, referred to as GPS) is a satellite radio navigation system developed by the U.S. Department of Defense in the 1970s. It has global, all-weather, continuous and implementable navigation, positioning and timing functions. Class users provide precise three-dimensional coordinates, speed and time. The global positioning system includes a GPS space part and a GPS receiver part. [0003] The GPS space part is composed of 24 or more satellites distributed in 6 equally spaced orbits, and the distribution of satellites can ensure that no less than 4 satellites are available for observation in any region of the world at any time. Each GPS satellite has an on-board rubidium atomic clock or cesium atomic...

AI Technical Summary

Problems solved by technology

However, the accuracy of various clock oscillators currently used in GPS receivers or other portable electronic devices is far from the reference clock on GPS satellites

This results in poor acquisition and tracking performance of GPS signals for GPS receivers using common clock oscillators

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