An Accurate Imaging and Doppler Chirp Rate Estimation Algorithm for Airborne CSSAR-GMTI Systems

yongkang li; Baochang Liu; Lei Wang; Hongmeng Chen; Laisen Nie; Lina Zeng; Guoan Bi

doi:10.1109/ACCESS.2019.2955718

IEEE Access (Jan 2019)

An Accurate Imaging and Doppler Chirp Rate Estimation Algorithm for Airborne CSSAR-GMTI Systems

yongkang li,
Baochang Liu,
Lei Wang,
Hongmeng Chen,
Laisen Nie,
Lina Zeng,
Guoan Bi

Affiliations

yongkang li: ORCiD; School of Electronics and Information, Northwestern Polytechnical University, Xi’an, China
Baochang Liu: ORCiD; School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, China
Lei Wang: ORCiD; School of Electronics and Information, Northwestern Polytechnical University, Xi’an, China
Hongmeng Chen: ORCiD; Beijing Institute of Radio Measurement, Beijing, China
Laisen Nie: ORCiD; School of Electronics and Information, Northwestern Polytechnical University, Xi’an, China
Lina Zeng: ORCiD; School of Electronics and Information, Northwestern Polytechnical University, Xi’an, China
Guoan Bi: ORCiD; School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore

DOI: https://doi.org/10.1109/ACCESS.2019.2955718
Journal volume & issue: Vol. 7
pp. 170077 – 170086

Abstract

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Airborne circular stripmap synthetic aperture radar (CSSAR)-ground moving target indication (GMTI) systems are attractive tools for air-to-ground surveillance and monitoring, because of their advantages of short revisit time and large coverage. This paper proposes an accurate imaging and Doppler chirp rate estimation algorithm for the airborne CSSAR-GMTI system with high range resolution. A key step of this algorithm is to utilize an alternation strategy to implement the correction of the target's range cell migration and the estimation of the range equation's quadratic coefficient alternatively. This step enables the proposed algorithm to achieve an accurate imaging and Doppler chirp rate estimation of a ground moving target. In addition, this paper presents an investigation on the accuracy of the quadratic-approximated range equation for ground moving target imaging. Numerical experiments are conducted to validate the proposed algorithm.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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