NDLI: Improved channel mismatch estimation for multi-channel HRWS SAR based on azimuth cross-correlation

Content Provider	IET Digital Library
Author	Fang, Chao Liu, Yanyang Suo, Zhiyong Li, Zhenfang Chen, Junli
Abstract	In multi-channel high-resolution and wide-swath (HRWS) synthetic aperture radar (SAR) processing, range sampling time errors and phase mismatches severely degrade the reconstruction performance of unambiguous Doppler spectrum. To address this problem, an improved channel mismatch estimation algorithm for multi-channel HRWS SAR is presented in this Letter. The technique of combining phase wrapping and weighted least-squares fitting is capable of realising a robust estimation of range sampling time errors and constant phases between adjacent channels. Then, Doppler centroid as well as channel phase mismatches can be estimated from these constant phases based on the theory of spatial cross-correlation coefficient (SCCC). Compared to the conventional algorithm, the improved performance can be achieved by using the proposed two-step procedure. The effectiveness of the proposed algorithm is confirmed by experimental results based on airborne real data.
Starting Page	235
Ending Page	237
Page Count	3
ISSN	00135194
Volume Number	54
e-ISSN	1350911X
Issue Number	Issue 4, Feb (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/54/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2017.4085
Journal	Electronics Letters
Publisher Date	2018-01-10
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adjacent Channel Airborne Radar Airborne Real Data Azimuth Cross-correlation Channel Mismatch Estimation Correlation Theory Doppler Centroid Doppler Radar Image Reconstruction Image Sampling Interpolation And Function Approximation Least Squares Approximation Multichannel High-resolution Wide-swath Synthetic Aperture Radar Processing Multichannel HRWS SAR Numerical Analysis Optical, Image And Video Signal Processing Phase Wrapping Radar Equipment Radar Imaging Radar Resolution Range Sampling Time Error Robust Estimation Spatial Cross-correlation Coefficient Theory Synthetic Aperture Radar System And Application Two-step Procedure Unambiguous Doppler Spectrum Reconstruction Performance Weighted Least Squares Fitting
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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