NDLI: Novel DOAs estimation method based on Doppler aided Chinese remainder theorem with all phase DFT for multiple targets in sparse array

Content Provider	IET Digital Library
Author	Cao, Chenghu Zhao, Yongbo Pang, Xiaojiao Chen, Sheng Hu, Yili
Abstract	In this study, the authors take further insight into the sparse geometry which offers a larger array aperture than uniform linear array with the same number of physical sensors. A novel direction of arrivals (DOAs) estimation model with flexible sparse geometry, which possesses the potential to significantly improve the estimation performance especially when the placed space and the weight of carrier such as airborne radar are restricted, is proposed to offer a larger aperture compared with co-prime array. The proposed algorithm can estimate DOAs by solving phase ambiguity. To improve the capability of spectrum analysis in frequency domain, all phase discrete Fourier transform (DFT), which can effectively alleviate spectrum leakage compared with traditional DFT, is proposed to apply into DOAs estimation. Additionally, the performance on degrees of freedom can be considerably improved compared with the state of the art where all the targets can be distinguished by Doppler information of received echo signal. More importantly, the proposed algorithm can effectively deal with DOA-closely-spaced targets because the proposed algorithm does not require to estimate signal subspace with ill-conditioned steering matrices. Both the theoretical analysis and simulation results demonstrate that the proposed algorithm significantly improves DOAs estimation precision with less computation cost.
Starting Page	1512
Ending Page	1520
Page Count	9
ISSN	17518784
Volume Number	14
e-ISSN	17518792
Issue Number	Issue 10, Oct (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/14/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2019.0464
Journal	IET Radar, Sonar & Navigation
Publisher Date	2020-06-02
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Airborne Radar Array Signal Processing Arrivals Estimation Model Chinese Remainder Theorem Co-prime Array Direction of Arrival Estimation Discrete Fourier Transform DOA-closely-spaced Targets DOAs Estimation Precision Doppler Frequency Information Doppler Information Estimation Performance Flexible Sparse Geometry Frequency Domain Larger Aperture Larger Array Aperture Matrix Algebra Multiple Targets Multiply Targets Novel DOAs Estimation Method Phase Ambiguity Phase DFT Phase Discrete Fourier Physical Sonsor Placed Space Radar Equipment Received Echo Signal Signal Processing And Detection Sparse Array Spectrum Analysis Spectrum Leakage Statistics System And Application Traditional DFT Uniform Linear Array
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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