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GPS (global positioning system) multipath mitigation method based on robust beam forming algorithm

An anti-multipath and beam-resistant technology, applied in radio wave measurement systems, satellite radio beacon positioning systems, measurement devices, etc., can solve the problems of Capon beamformer performance degradation, etc., to solve the sharp decline in performance and reduce the main peak deviation effect of shifting and suppressing coherent interference

Inactive Publication Date: 2013-08-14
HARBIN ENG UNIV
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Problems solved by technology

However, in these methods, the performance of the Capon beamformer will drop sharply when there is a mismatch between the covariance matrix of the array receiving data and the corresponding true value, and the useful signal and the interference signal are coherent.

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  • GPS (global positioning system) multipath mitigation method based on robust beam forming algorithm
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  • GPS (global positioning system) multipath mitigation method based on robust beam forming algorithm

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Embodiment Construction

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and implementation steps.

[0019] The core problem of decoherence is: how to restore the rank of the signal covariance matrix effectively through a series of processing or transformation. Such as figure 1 As shown: the multipath signal is the sum of the direct signal and its corresponding reflected signal. Due to the reflection by buildings, ground and other reflective objects, the signal received by the receiver is not the direct signal transmitted by the satellite, but the direct signal and the reflected signal. Superposition of signals. Two coherent signals entering the same array at the same time will make the vector of the signal subspace of the array covariance matrix less, but if two coherent signals enter different arrays at the same time, then the vector of the signal subspace of the sum of the two array covariance matrices It is possible not to redu...

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Abstract

The invention discloses a GPS (global positioning system) multi-path mitigation method based on a robust beam forming algorithm, which comprises the following steps: step I, modeling a GPS multipath channel by adopting a uniform linear array; step II, performing decorrelation on received signals by adopting the forward-backward spatial-smoothing technology, so as to obtain a new data covariance matrix and the optimal weight of a Capon beam former; step III, on the basis of the step II, establishing a cost function of the worst-case performance optimization robust beam forming algorithm, so as to solve the optimal weight under steering vector mismatch; step IV, on the basis of the step III, exerting uncertainty constraint on other array response errors, so as to obtain an improved model for the worst-case performance optimization robust beam forming algorithm; and step V, according to the model determined in the step IV, calculating to obtain the optimal weight vector of the Capon beam former, and determining the loading capacity by utilizing the Newton iteration method.

Description

technical field [0001] The invention relates to a GPS anti-multipath method based on a robust beamforming algorithm, and belongs to the technical field of processing coherent interference signals by using an adaptive beamforming technology. Background technique [0002] Adaptive beamforming is widely used in many fields such as radar, communication, sonar, and medicine. Ideally, conventional Capon (Optimal Beamformer) beamforming methods have high resolution and strong interference suppression capabilities. However, the actual interference environment is often more complicated. The GPS receiving system is susceptible to multipath signal interference. Directly using the conventional Capon adaptive beamforming method will lead to the cancellation of the desired signal, and the performance of the beamformer is seriously degraded. This is due to the assumption that the signal arrival angle and the true signal angle of arrival or the difference between the assumed array response...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21G01S19/22
Inventor 沈锋李平敏许保同徐定杰张贵贤宋丽杰陈潇刘海峰
Owner HARBIN ENG UNIV
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