GPS (Global Position System) receiver

Abstract

The invention is suitable for the field of communication and provides a GPS (Global Position System) receiver, which comprises a signal catcher used for coarsely catching a phase and a frequency of a satellite signal to generate a coarse synchronizing signal, a signal mixing and correlator used or carrying out mixing and relative operation on the satellite signal and outputting the relative result of the signal, a DSP (Digital Signal Processor) used for loading the corresponding algorithm and carrying out phase identification and filtering on the relative result of the signal so as to obtain and return a signal tracking result to the signal mixing and correlator, and a relative result computing unit used for figuring up a navigation bit and a carrier to noise ratio according to the relative result of the signal. According to the invention, the phase identification and filtering functions in a tracking loop of the GPS receiver can be completed by the DSP process, flexibility of the DSP processor on the algorithm selection is fully utilized, the tracking algorithm is dynamically adjusted, and tracking parameters are optimized well.

Description

technical field [0001] The invention belongs to the communication field, in particular to a GPS receiver. Background technique [0002] The Global Positioning System (GPS) receiver locates the user by capturing and tracking satellite signals, and at the same time calculates parameters such as the user's latitude and longitude coordinates and altitude values. In the GPS receiver, the rough phase and frequency of the satellite signal are first obtained through the signal acquirer. At this time, due to the limited accuracy of the phase and frequency of the obtained satellite signal, it needs to be further tracked through the tracking loop to obtain a more accurate phase and frequency of the satellite signal. [0003] The structure of the traditional GPS receiver tracking loop is as follows: figure 1 As shown, including carrier tracking and code tracking of GPS signals. Among them, carrier tracking demodulates the GPS signal from the carrier, refer to figure 1 , the carrier ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a GPS receiver, aiming to solve the problem that the existing GPS receiver cannot realize the flexible processing of tracking parameters

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