A method for forming steady beam based on interfering noise covariance matrix estimation

A technology of covariance matrix and interference noise, which is applied in the field of adaptive beamforming, can solve the problems of expected signal vector error, performance degradation, array element inconsistency, etc., and achieve high array output signal-to-interference-noise ratio, and array output performance degradation Obvious, strong robustness effect

Inactive Publication Date: 2015-03-11
HARBIN ENG UNIV
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However, in practical applications, the desired signal is often included in the received signal of the array, and errors such as waveform distortion, array element position error, signal direction of arrival (Direction of Arrive) estimation error, array element inconsistency and other errors will

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  • A method for forming steady beam based on interfering noise covariance matrix estimation
  • A method for forming steady beam based on interfering noise covariance matrix estimation
  • A method for forming steady beam based on interfering noise covariance matrix estimation

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] In order to avoid signal cancellation, the present invention proposes a robust adaptive beamforming method based on interference noise covariance matrix estimation. For the case where the incident signal is a far-field narrow-band independent signal and the noise is Gaussian white noise, the method needs to know prior information such as the number of incident signal sources and the steering vector of the incident signal. The specific steps are as follows:

[0047]Step 1: Use the antenna array to receive far-field narrow-band incident signals, take a limited number of snapshots to estimate the covariance matrix of the received data, then perform eigendecomposition on the covariance matrix of the received data, and obtain noise based on the prior information of the number of incident signal sources Subspace U n and estimated noise power The prior information o...

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Abstract

The present invention relates to the field of self-adaption beam forming during array signal processing, in particular, relates to a method for forming a steady beam based on an interfering noise covariance matrix estimation. The present invention includes using an antenna array to receive a distant field narrowband incident signal, using a limited snapshot number to estimate the covariance matrix for receiving data, then performing characteristic decomposition on the covariance matrix for receiving data, wherein prior information of the number of an incident signal source can be obtained via a method of estimating the number of the signal source; optimally obtaining a more accurate desired signal steering vector at a projection of a noise subspace according to an estimated desired signal steering vector, and performing estimation obtaining of the interfering noise covariance matrix according to interference signal steering vector prior information and an estimated noise power so as to perform beam forming. The present invention first performs the interfering noise covariance matrix estimation to get rid of the component of the desired signal in the training data, which can avoid the generation of signal cancellation.

Description

technical field [0001] The invention relates to the field of adaptive beamforming in array signal processing, in particular to a robust beamforming method based on interference noise covariance matrix estimation. Background technique [0002] Since the 1960s and 1970s, researchers began to gradually extend one-dimensional signal processing to the field of multi-dimensional signal processing, opening up a new important research field of array signal processing. Array signal processing is to arrange several or dozens of sensors into a sensor array at different positions in space according to a certain combination method, use it to receive and process spatial signals, extract signal features of useful signals, and analyze the information contained in the signals. Compared with the one-dimensional signal processing of the signal received by a single sensor, the sensor array has the advantages of flexible beam steering, high processing gain, strong interference suppression and hi...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 徐定杰刘向锋韩浩桑静周阳兰晓明迟晓彤张金丽李伟东
Owner HARBIN ENG UNIV
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