NDLI: Space-time matched filter design for interference suppression in coherent frequency diverse array

Content Provider	IET Digital Library
Author	Wang, Huake Liao, Guisheng Xu, Jingwei Zhu, Shengqi
Abstract	By transmitting a single frequency-shifted waveform, coherent frequency diverse array (FDA) can provide a simple way to realize full spatial coverages with stable gains. Owing to the range-angle dependency in coherent FDA, the authors implement a two-dimensional angle-time matched filter to perform equivalent transmit beamforming and matched filtering simultaneously. However, such filter structures merely control main-lobes of equivalent transmit beams towards target directions. It fails to form nulls at interference directions. Moreover, traditional adaptive beamforming by designing adaptive weight vectors are no longer applicable. Additionally, they find that the range resolution scales linearly with the element number. To tackle these issues, a space-time matched filter (STMF) in combination with the hybrid coding technique is proposed. Aiming at mitigating interferences, the STMF is designed with a formulation of quadratically constrained quadratic programing. By relaxation of quadratic constraints, the hard non-convex problem can be turned into the second-order cone programing to obtain optimal filter parameters. Furthermore, the hybrid coding technique is devised to jointly improve the range resolution. Numerical experiments of both two-dimensional range-angle outputs and one-dimensional range profiles via filtering are provided, which demonstrate that the STMF with hybrid coding can effectively suppress sidelobe interferences with a range resolution enhancement.
Starting Page	175
Ending Page	181
Page Count	7
ISSN	17519675
Volume Number	14
e-ISSN	17519683
Issue Number	Issue 3, May (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-spr/14/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-spr.2019.0227
Journal	IET Signal Processing
Publisher Date	2020-02-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adaptive Weight Vector Array Signal Processing Coherent FDA Coherent Frequency Diverse Array Radar Electromagnetic Compatibility Equivalent Transmit Filter Structure Filtering Method in Signal Processing Filtering Theory Hybrid Coding Technique Interference Interference Directions Interference Suppression Interpolation And Function Approximation Main Lobes Matched Filter Numerical Analysis One-dimensional Range Profile Optimal Filter Parameter Optimisation Technique Quadratic Constraint Quadratic Programing Quadratic Programming Radar Equipment Range Resolution Enhancement Range Resolution Scales Range-angle Dependency Sidelobe Interference Signal Processing And Detection Single Frequency-shifted Waveform Space-time Matched Filter Design Spatial Coverage Spatial Steering Vector Stable Gain Statistics STMF System And Application Target Directions Temporal Transmitted Waveform Traditional Adaptive Beamforming Algorithm Two-dimensional Angle-time Matched Filter Two-dimensional Range-angle Output
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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