空域滤波增益可调节的定向性均匀圆形阵列波达角估计

doi:10.12305/j.issn.1001-506X.2021.07.10

Abstract

Abstract:

In order to solve the problem that the incoming signal falls into the side lobes or null of antenna due to the position of the element antenna, the main lobe pointing and direction function of the directional uniform circular array, which leads to the low signal to noise ratio (SNR) and information failure of the signals received by some element antennas, the directional gain and power beam angle of the directional uniform circular array is studied. Then, the amplitude-frequency response of continuous excitation in the far field of directional uniform circular array is analyzed. Finally, an adjustable gain spatial filter based on half power lobe width independent of wave number is designed to improve the conventional direction of arrival (DOA) estimation model. The simulation experiment results show that the proposed model has the advantages of higher estimation accuracy and fewer participating antennas under low SNR compared with other models. Compared with the traditional directional DOA estimation model, when the SNR is -20 dB, the resolution of the adjacent spatial angle for the proposed model is obviously better than that for the former model. And the peak isolation degree of the adjacent angle can reach 65 dB with the adjustable filter gain to 10 dB.

Key words: directional uniform circular array (UCA), directional gain, spatial filtering, DOA estimation

CLC Number:

TN911.7

Di ZHAO, Zhongliang DENG, Weijie TAN, Aihua HU, Shihao TANG. DOA estimation for directional UCA using adjustable spatial filtering gain[J]. Systems Engineering and Electronics, 2021, 43(7): 1804-1812.

Figures/Tables 10

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DOA estimation for directional UCA using adjustable spatial filtering gain

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