Nulling-widening broadband robust adaptive beamforming method

Abstract

The invention discloses a nulling-widening broadband robust adaptive beamforming method. In the method, through assuming that multiple equal-intensity virtual interferences exist near an interferencereceived actually by an array at a certain spatial interval, after approximation processing, an extension matrix independent of an interference direction is obtained, each element in the extension matrix T is a sinc function without angle information, after multiplication with an array covariance matrix, K pieces of equal-intensity virtual interference information are automatically added near eachoriginal interference equivalently, an array pattern forms a null at each virtual interference, the nulls are connected together to form a wide null region, and thus, wide nulls can be adaptively formed in an interference direction. The method does not need to predict the interference direction information and has strong adaptive performance. Moreover, a closed-form solution can be given for a broadband beamforming weight vector, the computational complexity is small, and the real-time processing performance of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of array signal processing, and relates to a wideband robust adaptive beamforming method of zero notch widening. Background technique [0002] Array signal processing is an important branch in the field of signal processing, and it has been widely used in radar, sonar, communication, navigation, earthquake monitoring, speech signal processing, and biomedical engineering. The early array signal processing technology was mainly aimed at narrowband signals, and after decades of development, it has become increasingly mature. However, in order to further obtain long-distance target detection capabilities and high-resolution target imaging capabilities, modern radars often use broadband signals. Although the broadband signal can be regarded as the superposition of adjacent narrowband signals, the broadband array model is not equal to the sum of the narrowband array models, and the processing process of the broad...

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Problems solved by technology

However, this method needs to predict the range of interference in advance, and the adaptive performance is poor. In addition, this method cannot give a closed-form solution of the weight vector, and needs to be solved numerically through the convex optimization toolbox. The accuracy of the weight vector is poor. And the amount of calculation is huge, and the real-time processing performance is poor

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