Low Side-lobe Beam-forming Method Based on All-phase Preprocessing

doi:10.3969/j.issn.1000-1093.2018.10.013

Abstract

Abstract: In order to reduce the impacts of the side-lobe level and background noise due to conventional beam-forming on weak target detection, a low side-lobe beam-forming method based on all-phase preprocessing is proposed according to the features of the output value of directivity function on the direction of arrival (DOA) of target wave being 1 and the output value of directivity function being less than 1 on DOA of non-target wave. In the proposed method, the data received from linear array is divided into groups, the phase shift pretreatment for the data of each group is made based on the search angle, and then the results of phase shift pretreatment are combined to obtain a new set of data. The value of beam corresponding to the search angle can be obtained by phase shifting and summing of the new data. The theoretically analyzed, numerically simulated and experimental results show that the proposed method is used to make the phase shift treatment for the data of each group, thus changing the directivity function, improving the side-lobe level more than 13 dB and the signal to noise ratio by 1.7 dB, reducing the impacts of side-lobe level and background noise on weak target detection, and eliminating the phase inconsistency when the direction of arrival is unequal to search angle. The method improves the directivity function only by phase shift pretreatment for the data of sub-array.Key

Key words: arraysignalprocessing, all-phasepreprocessing, directivityfunction, side-lobelevel, weaktargetdetection

CLC Number:

TB566

ZHENG En-ming, CHEN Xin-hua, SONG Chun-nan. Low Side-lobe Beam-forming Method Based on All-phase Preprocessing[J]. Acta Armamentarii, 2018, 39(10): 1971-1978.

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第39卷
第10期2018 年10月兵工学报ACTA
ARMAMENTARIIVol.39No.10Oct.2018

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