A Robust Adaptive Beamforming Method for Sensor Arrays
An adaptive beam and sensor array technology, applied in the field of array signal processing, can solve problems such as performance saturation, achieve high robustness, improve convergence rate, and solve the effects of inconvenient implementation
Active Publication Date: 2017-10-31
NAT UNIV OF DEFENSE TECH
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[0005] In order to effectively solve the performance saturation problem of the existing robust adaptive beamforming method, the present invention provides a robust adaptive beamforming method based on spatial power spectrum matching
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[0011] The sensor array robust adaptive beamforming method provided by the present invention will be described in detail below with reference to the accompanying drawings.
[0012] figure 1 It is a flow chart of the array robust adaptive beamforming method provided by the present invention. The technical solution of the present invention is: a robust adaptive beamforming method for a sensor array, specifically comprising the following steps:
[0013] Step 1: Calculate the spatial power spectrum
[0014] First, the covariance matrix of the array observation data is calculated using the following formula which is:
[0015]
[0016] In the above formula,(·) H Indicates the conjugate transpose operation; x(n) is an M×1-dimensional array observation data vector, where M represents the number of array elements; N is the number of snapshots, and the value of N should be at least greater than or equal to the number of array elements M, the specific size is determined accordin...
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The invention provides a sensor array steady adaptive beamforming method comprising the following steps: using array observation data covariance matrix to calculate orientation vector; calculating array observation data space power spectrum according a sample covariance matrix and the orientation vector; determining an orientation section of desired signals and interference signals according to a spectrum peak position of the space power spectrum; averaging space power spectrums outside the orientation section, and calculating an average noise power; using a convex optimization method to obtain reconstructed a signal covariance matrix and an interference plus noise covariance matrix; calculating a product matrix of the said two matrixes, and using the feature vectors corresponding to the maximum feature value to obtain beamforming device factors. The method can effectively solve the performance saturation problems in the adaptive beamforming process, so the adaptive beamforming is high in stability, and easy to be applied.
Description
technical field [0001] The present invention relates to the technical field of array signal processing, and more specifically, relates to a robust adaptive beamforming method of a sensor array. Background technique [0002] Array signal processing is widely used in many fields such as sonar, radar, wireless communication, medical imaging, geological exploration, radio astronomy, etc., and beamforming is a very important task of array signal processing, and its main functions include: forming array receiving Directionality of the system; performing airspace filtering; suppressing spatial interference and environmental noise, improving the signal-to-noise ratio; estimating the direction of signal arrival, performing multi-target resolution; creating conditions for signal source positioning; providing information for target identification, etc. The process of beamforming is as follows: a spatially distributed array is used to collect data, and then the collected array data is l...
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IPC IPC(8): G06F17/16
CPCG06F17/16
Inventor 陈勇王芳万建伟李纲许可
Owner NAT UNIV OF DEFENSE TECH