Signal separation estimation theory-based satellite navigation signal multipath interference suppression method

Abstract

The invention discloses a signal separation estimation theory-based satellite navigation signal multipath interference suppression method, which mainly relates to a time delay estimation algorithm and a frequency estimation algorithm of a diameter signal and a multipath signal of a satellite navigation system. The method comprises the following steps of: estimating a satellite signal frequency which includes Doppler under the condition that a time delay is unknown, eliminating a fuzzy frequency according to the intermediate frequency value of the satellite signal and prior information in which a Doppler frequency shift range is known, and estimating the time delays of the diameter signal and the multipath signal respectively by using the signal separation estimation theory. By the signal separation estimation theory-based satellite navigation signal multipath interference suppression method, the time delay information and the frequency information of the diameter signal can be directly estimated and the aim of eliminating multipath signal influence can be fulfilled in a multipath environment.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation and positioning, in particular to a satellite navigation signal multipath interference suppression method based on signal separation and estimation theory. Background technique [0002] Since the appearance of the satellite navigation and positioning system, it has been widely used in various fields, and has become an indispensable and important basic tool in the production and life of modern society. Most of the errors in the satellite navigation system can be completely or mostly eliminated by differential technology based on the principle of error correlation within a certain range, such as satellite ephemeris error and clock error, ionosphere and troposphere delay error, etc. In actual measurement, in addition to receiving signals directly from the direction of the satellite, the receiver antenna will also receive signals reflected by other objects. Since the diameter signal take...

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Problems solved by technology

However, the narrowband correlation technology assumes that the receiver signal channel has an infinite bandwidth, and this condition cannot be satisfied in practice.

Richard D.J. et al. have proved that when the correlation interval is smaller than the reciprocal of the equivalent bilateral bandwidth of the channel, the tracking error of the delay-locked loop will tend to be a constant, and the tracking error cannot be reduced by further reducing the correlation interval

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