Image and Signal Processing Methods

Inverse synthetic aperture radar imaging of targets with complex motions based on modified chirp rate–quadratic chirp rate distribution for cubic phase signal

[+] Author Affiliations
Li Yanyan, Su Tao, Zheng Jibin

Xidian University, National Laboratory of Radar Signal Processing, School of Electronic Engineering, 2 South Taibai Road, Xi’an 710071, China

J. Appl. Remote Sens. 9(1), 095036 (Dec 23, 2015). doi:10.1117/1.JRS.9.095036
History: Received July 30, 2015; Accepted November 25, 2015
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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.

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Citation

Li Yanyan ; Su Tao and Zheng Jibin
"Inverse synthetic aperture radar imaging of targets with complex motions based on modified chirp rate–quadratic chirp rate distribution for cubic phase signal", J. Appl. Remote Sens. 9(1), 095036 (Dec 23, 2015). ; http://dx.doi.org/10.1117/1.JRS.9.095036


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