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Journal of Applied Remote Sensing

Inverse synthetic aperture radar imaging of targets with complex motions based on modified chirp rate–quadratic chirp rate distribution for cubic phase signal
Author(s): Li Yanyan; Su Tao; Jibin Zheng
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Paper Abstract

For targets with complex motions, the time-varying Doppler frequency deteriorates inverse synthetic aperture radar (ISAR) images. After range alignment and phase adjustment, azimuth echoes in a range cell can be modeled as multicomponent cubic phase signals (CPSs). The chirp rate and the quadratic chirp rate of the CPS are identified as the causes of the time-varying Doppler frequency; thus, it is necessary to estimate these two parameters correctly to obtain a well-focused ISAR image. The parameter-estimation algorithm based on the modified chirp rate-quadratic chirp rate distribution (M-CRQCRD) is proposed for the CPS and applied to the ISAR imaging of targets with complex motions. The computational cost of M-CRQCRD is low, because it can be implemented by the fast Fourier transform (FFT) and the nonuniform FFT easily. Compared to two representative parameter-estimation algorithms, the M-CRQCRD can acquire a higher antinoise performance due to the introduction of an optimal lag-time. Through simulations and analyses for the synthetic radar data, the effectiveness of the M-CRQCRD and the imaging algorithm based on the M-CRQCRD are verified.

Paper Details

Date Published: 23 December 2015
PDF: 11 pages
J. Appl. Remote Sens. 9(1) 095036 doi: 10.1117/1.JRS.9.095036
Published in: Journal of Applied Remote Sensing Volume 9, Issue 1
Show Author Affiliations
Li Yanyan, Xidian Univ. (China)
Su Tao, Xidian Univ. (China)
Jibin Zheng, Xidian Univ. (China)

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