Low-cost time service and synchronization method and equipment for global positioning system receiver

Abstract

The invention provides a low-cost timing and synchronization method of a GPS receiver, and a device thereof, and relates to the timing and synchronization field, in particular to the low-cost timing and synchronization field which is realized at a baseband processing chip level based on the GPS such as a US GPS. A timing and synchronization method based on the GPS is improved, and the method and the device are realized based on a baseband processing chip device of the GPS. A crystal oscillator is subject to a soft calibration by coordinated universal time which is worked out by the GPS, an external device is timed by combining a time code and a synchronization pulse signal, and high-precision timing can be realized by the low-cost crystal oscillator. The method and the device help calibrate the crystal oscillator without hardware, which greatly simplifies the system design and reduces the cost. The device has the advantages of low hardware overhead, strong expandability, high reliability and the like.

Description

technical field [0001] The invention relates to the field of time grant and synchronization, in particular to a global positioning system, and belongs to the field of low-cost time service and synchronization realized at the baseband processing chip level. Background technique [0002] Global satellite positioning and navigation systems, such as the United States' Global Positioning System (GPS), consist of a constellation of satellites (also known as Navstar satellites) that transmit GPS signals that can be used by a receiver to determine the receiver's Location. Satellite orbits are arranged in multiple planes so that the signal can be received from at least four satellites at any location on Earth. More typically, the signal is received from more than six satellites in most places on Earth. [0003] The GPS signal transmitted by each GPS satellite is a direct sequence spread frequency signal. The commercially used signal is related to the Standard Positioning Service (...

AI Technical Summary

Problems solved by technology

Existing timing schemes often convert GPS time into analog quantities to directly compensate the crystal oscillator, but this type of scheme has a complex structure, and the introduction of analog circuits introduces additional design difficulties and problems, greatly increasing the cost, and the system stability is not high

And it needs to customize the crystal oscillator and its compensation circuit, and only TCXO can be used instead of OCXO

At the same time, due to real-tim

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