Method, device, electronic equipment and storage medium for determining phase difference

Abstract

The embodiment of the invention provides a phase difference determining method and device, an electronic device and a storage medium. The method includes the steps of determining different initial state values corresponding to multiple particles respectively; according to the initial state vale of each particle, calculating a first predicted phase difference value between a current received signaland a current local signal through an inertial navigation system; using the first predicted phase difference value as a particle state value of each particle; calculating a second predicted phase difference value between the current received signal and the current local signal; determining the particle weight of each particle according to the particle state value of the particle and the second predicted phase difference value; multiplying the particle state value of each particle with the particle weight to obtain a product corresponding to the particle; summing the products corresponding toall the particles, and using a resulting sum value as a final phase difference value between the current received signal and the current local signal. In this way, the accuracy of the determined phasedifference value in a multipath interference environment can be improved.

Description

technical field [0001] The present invention relates to the technical field of signal processing, in particular to a phase difference determination method, device, electronic equipment and storage medium. Background technique [0002] In the indoor positioning technology, signal tracking can be realized through a tracking loop formed by various parts included in the positioning receiver. Specifically, the tracking loop is mainly composed of a local pseudocode generator, a carrier numerically controlled crystal oscillator (NCO, Numerically Controlled Oscillator)), a mixer, a correlator, a phase detector and a filter. Wherein, the local pseudo-code generator is used to generate the local pseudo-code, and the phase detector is used to determine the phase difference between the local pseudo-code and the input signal of the tracking loop, and the tracking loop realizes the tracking of the input signal through the phase difference, Wherein, the input signal may be a received sign...

AI Technical Summary

Problems solved by technology

However, the indoor environment is complex, and there may be multipath signals that cause multipath interference. Due to the existence of multipath signals, the autocorrelation function of the received signal will be distorted.

This will make the phase difference between the determined local pseudo code and the received signal less accurate in the environment of multipath interference

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