ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Interferometric DOA Estimation Based on Shift Invariance Subarrays for Suppressing Mainlobe Jamming
Received date: 2013-01-29
Revised date: 2013-05-12
Online published: 2013-05-27
Supported by
National Basic Research Program of China (2011CB707001);National Natural Science Foundation of China for Youth (61101243); National Natural Science Foundation of China (60971108); Key Laboratory Fund (9140C***0104); Pre-research Fund (9140A***0126)
To deal with the problem of target direction of arrival (DOA) estimation in the presence of mainlobe jamming, a novel method for adaptive interferometric DOA estimation by using subarray shift invariance has been proposed. First, the planar array is divided into up and down subarrays satisfying that one can be overlaped to the other by shift; second, the covariance matrices corresponding to up and down subarays are calculated with training samples and eigenvectors are obtained by eigen decompositions of the two covariance matrices, respectively; third, adaptive up and down weight vectors are obtained by the projection of beam direction vector onto orthogonal subspaces of interfences, respectively; fourth, elevation angle can be estimated by interferometric processing between up and down outputs of anti-jamming; finally, azimuth angle can be achieved by similar processing between right and left subarrays. It is proved that DOA estimations have nothing to do with adaptive beam distortions. Compared with other methods, the proposed method has a better performance of interference suppression and a higer precision of DOA estimation. Results of measured and simulated data demonstrate the effectiveness and superiority of the proposed method.
LI Jing , ZENG Cao , LIAO Guisheng , TAO Haihong , ZHAO Yuannan . Interferometric DOA Estimation Based on Shift Invariance Subarrays for Suppressing Mainlobe Jamming[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013 , 34(12) : 2804 -2814 . DOI: 10.7527/S1000-6893.2013.0257
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