NDLI: Wideband distributed coherent aperture radar based on stepped frequency signal: theory and experimental results

Content Provider	IET Digital Library
Author	Zeng, Tao Yin, Pilei Liu, Quanhua
Abstract	As the next generation radar, although the distributed coherent aperture radar (DCAR) has been proposed and some basic works have been developed in recent years, this new radar technology has not been researched systematically. In this study, the concept and closed-loop workflow of DCAR are described in detail first. Then, the coherent parameters (CPs), which play an important role to realise full coherence in DCAR, are estimated based on orthogonal signal and coherent signal. To investigate the limits of estimation accuracy of CPs, the Cramer–Rao lower bounds are derived. The estimation values of CPs are filtered using Kalman filter to improve the estimation accuracy. In the following, the wideband full coherence technology based on stepped frequency signal is proposed to improve system robustness to time synchronisation error, which makes the DCAR technology more realisable in engineering. Furthermore, a grating lobe suppression method based on modified genetic algorithm in synthetic array pattern of DCAR is presented. Ultimately, the experiments are carried out using test system to verify the theory of wideband DCAR.
Starting Page	672
Ending Page	688
Page Count	17
ISSN	17518784
Volume Number	10
e-ISSN	17518792
Issue Number	Issue 4, Apr (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/10/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2015.0221
Journal	IET Radar, Sonar & Navigation
Publisher Date	2016-04-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Array Signal Processing Coherent Parameter Accuracy Estimation Coherent Signal CP Estimation Accuracy Improvement Cramer-Rao Lower Bound DCAR Closed-loop Workflow DCAR Synthetic Array Pattern Filtering Method in Signal Processing Genetic Algorithm Grating Lobe Suppression Method Kalman Filter Modified Genetic Algorithm Next Generation Radar Optimisation Technique Orthogonal Signal Parameter Estimation Radar Equipment Radar Signal Processing Radar Theory Stepped Frequency Signal Synchronisation Synthetic Aperture Radar System And Application Time Synchronisation Error Wideband Distributed Coherent Aperture Radar
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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