Anti-multipath high-precision code loop phase detection method

Abstract

The invention relates to an anti-multipath high-precision code loop phase detection method. The anti-multipath high-precision code loop phase detection method comprises steps that a shift register is constructed, and the shift register is used to generate four different relatively delayed local codes; by using a narrow correlator technology, an integral accumulated value of a same-direction component and an orthogonal component is calculated; a code phase difference is calculated respectively by adopting a non-coherent early minus late amplitude method and a front and back slope method, and the switching of the above mentioned two phase detection methods is carried out according to the phase difference. The anti-multipath high-precision code loop phase detection method is advantageous in that anti-multipath effect and high phase detection result precision are provided; the accurate phase difference is calculated, and the local codes are aligned with received codes more accurately, and therefore the tracking precision of the code loop and a positioning performance of a receiver are improved.

Description

technical field [0001] The invention relates to an anti-multipath high-precision code ring phase detection method, which belongs to the technical field of satellite navigation receivers. Background technique [0002] The code tracking loop is an important part of the satellite navigation receiver. Its main function is to maintain the phase consistency between the locally copied pseudo-code (C / A) and the received pseudo-code, so as to obtain the code phase of the received signal. And its pseudo-range measurement value is provided to the receiver to complete the positioning and speed measurement function. Therefore, the phase detection accuracy of the code ring plays an important role in the pseudo-range measurement accuracy, which ultimately affects the receiver positioning speed measurement accuracy. In practical applications, due to the signal multipath effect, it will bring errors to the measurement of the code phase and affect the positioning performance of the receiver....

AI Technical Summary

Problems solved by technology

Therefore, the phase detection accuracy of the code ring plays an important role in the pseudo-range measurement accuracy, which ultimately affects the receiver positioning speed measurement accuracy

In practical applications, due to the signal multipath effect, it will bring errors to the measurement of the code phase and affect the positioning performance of the receiver. Therefore, a phase detection method that resists multipath and improves the tracking accuracy of the code ring is needed.

[0003] At present, the anti-multipath phase detection methods commonly used in the code tracking loop mainly include a single forward and backward slope method and a multipath estimated delay-locked loop (MEDLL). It comes from the problem that the correlation function curve is distorted and the tracking accuracy is reduced; and MEDLL is a multi-path signal parameter estimation method combining software and hardware. The algorithm implementation is quite complicated, and additional correlators and other hardware resources are required. Big

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