Multipath suppression method and device based on linear regression

Abstract

The embodiments of the invention provide a multipath suppression method and a device based on linear regression. The method comprises the following steps: a processor collects samples corresponding to advance correlators and lag correlators at a target sampling time; the processor determines the slope at both sides of an autocorrelation function curve for the samples obtained according to a linear regression approach; the processor calculates the phase discrimination error based on the slope at both sides of the autocorrelation function curve and a target output value; and finally, the processor corrects the phase discrimination value of a phase discriminator based on the calculated phase discrimination error so that the phase discriminator can adjust the original local copy code of a positioning receiver according to the corrected phase discrimination value to complete multipath suppression, wherein the samples include the output values of the correlators at the target sampling time and the code phase deviation values corresponding to the correlators. Through the scheme of the invention, the accuracy of the calculated slope at both sides of the autocorrelation function curve can be ensured, the accuracy of the corrected phase discrimination value can be ensured, and the effect of multipath suppression can be improved.

Description

technical field [0001] The invention relates to the technical field of indoor positioning, in particular to a linear regression-based multipath suppression method and device. Background technique [0002] Multipath transmission phenomenon refers to the propagation phenomenon of radio signals from the transmitting antenna to the receiving antenna through multiple paths; multipath transmission phenomenon will cause multipath interference. For example, in the indoor environment, due to the complex indoor environment, the signal will be affected when it is transmitted indoors Indoor walls and other influences produce a large number of reflected signals, and the multipath transmission phenomenon is serious. The indoor positioning receiver will receive the multipath composite signal composed of the direct signal directly sent by the satellite and other reflected signals, and use this multipath composite signal to perform Therefore, the positioning accuracy of indoor positioning re...

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Problems solved by technology

[0006] However, under the conditions of limited bandwidth or low signal-to-noise ratio, the autocorrelation function curve of the signal is not composed of a straight line with a clear slope, such as figure 2 and image 3 As shown, under the condition of limited bandwidth or low signal-to-noise ratio, the autocorrelation function curve of the signal is very irregular. At this time, if the method in the prior art is used to realize multipath suppression, due to the determined autocorrelation function The slopes on both sides of the curve are inaccurate, resulting in inaccurate calculated phase detection errors, further resulting in inaccurate corrected phase detection values, and poor multipath suppression effect

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