Two-dimensional direction of arrival estimation based on asymmetric amplitude interpolation
The amplitude interpolation azimuth estimation method can obtain direction of arrival(DOA)by sampling and interpolating a few beams,which avoids intensive DOA search and is widely used in engineering.At present,most of the methods are based on one dimension,and use symmetric function for interpolation,which leads to high estimation error.In this paper,the method is extended from one-dimension to two-dimension arbitrary array by decoupling,and considering the asymmetry of left and right beams when the DOA deviates from 0°,the asymmetric function is used for amplitude interpolation with the solution condition of the slope ratio of left and right beams.Furthermore,in order to solve the problem of angle mismatch in two-dimensional asymmetric interpolation,a method of interative interpolation is proposed.Finally,the effects of the interpolation method,angle mismatch and signal to noise ratio(SNR)on the interpolation accuracy are simulated,the interpolation accuracy of the proposed method is better than that of the traditional symmetric interpolation method.Through the experimental data of Qiandao Lake,the estimation accuracy obtained by the proposed method with 10° interval interpolation can be compared with that obtained by conventional beamforming with 0.01° intensive scanning.The method presented can meet the real-time requirements of some engineering applications and achieve high accuracy of azimuth estimation at the same time.
direction of arrival(DOA)estimationtwo-dimensional asymmetric interpolationslope ratioangular mismatchiterated interpolation
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