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

A satellite navigation signal and multi-path interference technology, applied in the field of satellite navigation and positioning, can solve problems such as unsatisfactory, reduce tracking error, etc., and achieve the effect of small error, high precision, and simple processing steps

Inactive Publication Date: 2012-06-20
CIVIL AVIATION UNIV OF CHINA
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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 s

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

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Embodiment Construction

[0020] The satellite navigation signal multipath interference suppression method based on the signal separation estimation theory provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] In order to facilitate the multipath performance analysis of the satellite navigation signal without loss of generality, an analysis model of a single reflection path is adopted in this embodiment. The method of the present invention is also applicable when there are multiple reflection paths.

[0022] Such as figure 1 As shown, the satellite navigation signal multipath interference suppression method based on the signal separation estimation theory provided by the present invention includes the following steps carried out in order:

[0023] (1) Down-convert the radio frequency signal received by the satellite antenna into an intermediate frequency signal;

[0024] The radio frequency signal received by...

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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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Application Information

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IPC IPC(8): G01S19/22G01S19/21
Inventor 吴仁彪李杰王文益卢丹王璐
Owner CIVIL AVIATION UNIV OF CHINA
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