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Joint polarization and DOA estimation based on improved maximum likelihood estimator and performance analysis for conformal array

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Journal of Systems Engineering and Electronics 2023年第6期34卷 1490-1500页

作者： SUN Shili LIU Shuai WANG Jun YAN Fenggang JIN Ming School of Information Science and Engineering Harbin Institute of TechnologyWeihai 264209China

The conformal array can make full use of the aperture,save space,meet the requirements of aerodynamics,and is sensitive to polarization *** has broad application prospects in military,aerospace,and communication *** joint polarization and direction-of-arrival(DOA)estimation based on the conformal array and the theoretical analysis of its parameter estimation performance are the key factors to promote the engineering application of the conformal *** solve these problems,this paper establishes the wave field signal model of the conformal ***,for the case of a single target,the cost function of the maximum likelihood(ML)estimator is rewritten with Rayleigh quotient from a problem of maximizing the ratio of quadratic forms into those of minimizing quadratic *** this basis,rapid parameter estimation is achieved with the idea of manifold separation technology(MST).Compared with the modified variable projection(MVP)algorithm,it reduces the computational complexity and improves the parameter estimation ***,the MST is used to solve the partial derivative of the steering ***,the theoretical performance of ML,the multiple signal classification(MUSIC)estimator and Cramer-Rao bound(CRB)based on the conformal array are derived respectively,which provides theoretical foundation for the engineering application of the conformal ***,the simulation experiment verifies the effectiveness of the proposed method.

关键词： conformal array maximum likelihood(ML)estimator manifold separation technology(MST) parameter estimation Cramer-Rao bound(CRB).

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Hybrid alternate projection algorithm and its application for practical conformal array pattern synthesis

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Journal of Systems Engineering and Electronics 2012年第5期23卷 625-632页

作者： Fei Zhao Shunlian Chai Huiying Qi Ke Xiao Junjie Mao College of Electronic Science and Engineering National University of Defense TechnologyChangsha 410073P.R.China

Based on the fabricated 12-element cavity-backed microstrip sector cylinder array,a novel hybrid alternate projection algorithm（HAPA）,which combines analytical method with numerical techniques effectively,is proposed for synthesizing the pattern of practical conformal *** algorithm applies the variable direction aperture projection method with mutual coupling correction techniques to provide the good initial excitations of elements to the enhanced alternate projection algorithm（EAPA）.In order to do further optimization,which improves the convergent speed of the algorithm ***,the HAPA has been applied to the fabricated sector cylinder array with mutual coupling *** results of synthesized patterns,such as low sidelobe with null points formed pattern,beam scanning with low sidelobe pattern and the shaped beam pattern are *** demonstrates the validity of HAPA in practical conformal array synthesis.

关键词： conformal array alternate projection algorithm aperture projection method pattern synthesis mutual coupling

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array gain for a conformal acoustic vector sensor array:An experimental study

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Chinese Physics B 2016年第12期25卷 126-131页

作者：汪勇杨益新何正耀雷波孙超马远良 School of Mechanical Engineering Xi'an Jiaotong University School of Marine Science and Technology Northwestern Polytechnical University

An acoustic vector sensor can measure the components of particle velocity and the acoustic pressure at the same point simultaneously, which provides a larger array gain against the ambient noise and a higher angular resolution than the omnidirectional pressure sensor. This paper presents an experimental study of array gain for a conformal acoustic vector sensor array in a practical environment. First, the manifold vector is calculated using the real measured data so that the effects of array mismatches can be minimized. Second, an optimal beamformer with a specific spatial response on the basis of the stable directivity of the ambient noise is designed, which can effectively suppress the ambient noise. Experimental results show that this beamformer for the conformal acoustic vector sensor array provides good signal-to- noise ratio enhancement and is more advantageous than the delay-and-sum and minimum variance distortionless response beamformers.

关键词： conformal array acoustic vector sensor array gain optimal beamforming

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Effective approach for conformal subarray design based on maximum entropy of planar mappings

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Journal of Electronic Science and Technology 2024年第3期22卷 16-25页

作者： Xiao-Dong Zheng Sheng-Teng Shi Jun Ou-Yang Feng Yang Qammer Abbasi Abubakar Sharif School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China School of Engineering University of GlasgowScotlandG128QQUK

In this paper,an effective algorithm for optimizing the subarray of conformal arrays is *** method first divides theconformal array into several first-level *** uses the X algorithm to solve the feasible solution of first-level subarray tiling and employs the particle swarm algorithm to optimize the conformal array subarray tiling scheme with the maximum entropy of the planar mapping as the fitness ***,convex optimization is applied to optimize the subarray amplitude *** results verify that the method can effectively find the optimal conformal array tiling scheme.

关键词： conformal array Irregular arrays Particle swarm optimal algorithm Maximum entropy model

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