NDLI: Constant frequency error effects and their elimination in distributed ISAR fusion imaging

Content Provider	IET Digital Library
Author	Kang, Hailong Li, Jun Guo, Yifan Ma, Hui Yu, Zehua
Abstract	Some new problems in distributed inverse synthetic aperture radar (ISAR) fusion imaging may be caused by constant frequency errors (CFE) due to the imperfect match of two independent oscillators. In this study, the effects of the CFE on distributed ISAR coherent fusion imaging are first analysed, which show that the CFE will produce false images (incorrect scatterer number and position) in distributed ISAR fusion imaging. To eliminate the effects of the CFE, a novel CFE calibration scheme is devised by exploiting the echo signal phase relationship between different sensors and making some reasonable approximations. The echo signal of the active radar (transmit and receive) is used as a reference signal. After some derivation, the phase relationship between the reference signal and other signals with CFE can be derived. Based on the derived phase relationship, the CFE of each radar will be estimated by multiple signal classification algorithm. Then, the estimated CFE value is further used to calibrate the CFE of each radar before signal coherent fusion. As a result, the false image is eliminated. Simulation results prove the authors theoretical analysis and the effectiveness of their method.
Starting Page	1976
Ending Page	1983
Page Count	8
ISSN	17518784
Volume Number	14
e-ISSN	17518792
Issue Number	Issue 12, Dec (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/14/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2020.0276
Journal	IET Radar, Sonar & Navigation
Publisher Date	2020-09-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Calibration Constant Frequency Error Constant Frequency Error Effects Derived Phase Relationship Distributed Inverse Synthetic Aperture Radar Fusion Imaging Distributed ISAR Coherent Fusion Imaging Echo Echo Signal Phase Relationship Electromagnetic Wave Scattering Estimated CFE Value False Image Image Fusion Novel CFE Calibration Scheme Optical, Image And Video Signal Processing Radar Equipment Radar Imaging Reference Signal Signal Classification Signal Coherent Fusion Synthetic Aperture Radar System And Application
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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