Design method of real beam forming machine

Abstract

The invention relates to a design method for a real beam former. A real number weight vector of the real beam former is designed by utilizing two different orthogonality relations so as to cause the output of the real beam former to appear obvious local maximum along the corresponding signal direction, thus finishing the forming of the real beam with lower side lobe level and higher direction resolution to weak signals and coherent signals. The method comprises the following steps: an array received data is used for determining a sample autocorrelation matrix and an inverse matrix thereof; a unitary transformation matrix corresponding to the searching direction is determined and unitary transformation is carried out, and only the real number part of a unitary transformation result is taken; the weight vector of the real beam former is obtained according to the sum of the column vector of the matrix of the real number part of the unitary transformation result. The weight vector of the real beam former is acted on the real number part of the sample autocorrelation matrix, and the spatial spectrum of the real beam former is determined: the direction estimation of a corresponding signal is obtained by searching the peak position of the spatial spectrum, and the forming of the real beam is finished. The method provides a new method for array signal processing, with remarkable effect and significant meaning.

Description

Technical field [0001] The invention belongs to signal processing, relates to array signal beam forming technology, in particular to a design method of a high-resolution real beam former. Background technique [0002] In the array signal beamforming technology, the active / passive direction finding system needs to use high-resolution technology to separate the signals in the direction in order to use the signals received by the array with limited aperture for multi-target direction finding. However, the directional resolution of the classical spatial Fourier transform method is limited by the Rayleigh limit, and the Rayleigh limit is only determined by the size of the array aperture. The method of improving the signal-to-noise ratio breaks the Rayleigh limit. In the existing array direction finding technology, Capon's beamforming method and typical subspace methods, such as multiple signal classification method (MUSIC, MUltiple SIgnals Classification) are usually used to rea...

AI Technical Summary

Problems solved by technology

However, since the ideal beamformer is related to the true value of the autocorrelation matrix, when the number of array snapshots is small and the signal-to-noise ratio is low, the sample autocorrelation matrix will inevitably be greatly affected by noise, resulting in beamforming Orientation resolution of the sensor deteriorates

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