NDLI: High accuracy unambiguous angle estimation using multi-scale combination in distributed coherent aperture radar

Content Provider	IET Digital Library
Author	Long, Teng Zhang, Honggang Zeng, Tao Liu, Quanhua Chen, Xinliang Zheng, Le
Abstract	Distributed coherent aperture radar (DCAR) can realise N 3 times signal-to-noise ratio promotion, as well as achieve high accuracy angle estimation since it has an equivalent large aperture. However, due to its sparse array, grating lobes are emerged in antenna pattern, which will lead to ambiguous angle estimation. Based on the various degrees of freedom of DCAR, this study proposes a multi-scale combination method to disambiguate the correct angle from the ambiguous ones. Firstly, it combines the antenna in different scale, so each combination has different equivalent phase centre spacings. Secondly, phase comparison monopulse is employed to measure the angles under each combination with relatively low computational complexity, even in the single snapshot scenario. Thirdly, the high accuracy unambiguous angle can be resolved from the low accuracy unambiguous angle step by step. Moreover, the estimation accuracy and design criterion on correct angle extraction are also analysed, providing an array geometry and combination design approach to guarantee the disambiguity process a success. Finally, DCAR with two radars and eight radars are properly designed, respectively, and simulations and field experiments validate the effectiveness of the proposed method.
Starting Page	1090
Ending Page	1098
Page Count	9
ISSN	17518784
Volume Number	11
e-ISSN	17518792
Issue Number	Issue 7, Jul (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/11/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2016.0450
Journal	IET Radar, Sonar & Navigation
Publisher Date	2017-02-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Angle Extraction Antenna Pattern Antenna Radiation Pattern Array Geometry Combination Design Approach Computational Complexity DCAR Degree of Freedom Design Criterion Disambiguity Process Distributed Coherent Aperture Radar Equivalent Phase Centre Spacings Estimation Theory Grating Lobes High Accuracy Unambiguous Angle Estimation Multiscale Combination Method Phase Comparison Monopulse Radar Antenna Radar Equipment Signal to Noise Ratio Single Antenna Sparse Array Statistics System And Application
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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