Resolution Error Smoothing Method of Digital Code Phase and Satellite Navigation Receiver

Abstract

The invention discloses a resolution error smoothing method of digital code phase and a satellite navigation receiver. By constructing a pseudo code phase tracking loop, the mechanism of code phase estimation in the navigation receiver is analyzed. The traditional code phase control unit is improved, and the phase cycle jitter is added to the local code phase. Three phase-period dithering patterns are designed for different implementations. According to the code phase resolution of the digital correlator and the coherent integration time constraints, the amplitude and period of the phase period jitter are designed. The estimation accuracy of the digital code phase can be significantly improved without significantly increasing the amount of calculation.

Description

technical field [0001] The invention relates to the field of satellite navigation signal processing, in particular to a resolution error smoothing method of digital code phase and a satellite navigation receiver. Background technique [0002] In a satellite navigation receiver, the code phase is an important time-delay observation, which is used to support the receiver's positioning and timing functions. For an all-digital satellite navigation receiver, the sampling clock of the baseband signal has a significant impact on the accuracy of the code phase estimation. When the sampling clock is equal to an integer multiple of the spreading code rate, the signal code phase will be repeatedly sampled, and the ergodicity of the code phase corresponding to the sampling point is insufficient, resulting in serious resolution errors in the digital code phase estimation. [0003] The resolution of digital code phase estimation can be effectively improved by increasing the sampling cloc...

AI Technical Summary

Problems solved by technology

However, the sampling clock of digital baseband signals is closely related to the hardware resources of the receiver. Under the condition of constrained hardware resources, it is not necessarily possible to increase the sampling clock or use non-equal sampling frequencies.

Current smoothing methods cannot smooth digital code phase resolution errors without significantly increasing computation

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