Image and Signal Processing Methods

Extended nonlinear chirp scaling algorithm for highly squinted missile-borne synthetic aperture radar with diving acceleration

[+] Author Affiliations
Rengli Liu

Chinese Academy of Science, Institute of Electronics, 19 North Sihuan Road, Haidian, Beijing 100190, China

University of Chinese Academy of Sciences, 10 South Ertiao Road, Haidian, Beijing 100039, China

Yanfei Wang

Chinese Academy of Science, Institute of Electronics, 19 North Sihuan Road, Haidian, Beijing 100190, China

J. Appl. Remote Sens. 10(2), 025005 (Apr 18, 2016). doi:10.1117/1.JRS.10.025005
History: Received August 26, 2015; Accepted March 23, 2016
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Abstract.  An extended nonlinear chirp scaling (NLCS) algorithm is proposed to process data of highly squinted, high-resolution, missile-borne synthetic aperture radar (SAR) diving with a constant acceleration. Due to the complex diving movement, the traditional signal model and focusing algorithm are no longer suited for missile-borne SAR signal processing. Therefore, an accurate range equation is presented, named as the equivalent hyperbolic range model (EHRM), which is more accurate and concise compared with the conventional fourth-order polynomial range equation. Based on the EHRM, a two-dimensional point target reference spectrum is derived, and an extended NLCS algorithm for missile-borne SAR image formation is developed. In the algorithm, a linear range walk correction is used to significantly remove the range-azimuth cross coupling, and an azimuth NLCS processing is adopted to solve the azimuth space variant focusing problem. Moreover, the operations of the proposed algorithm are carried out without any interpolation, thus having small computational loads. Finally, the simulation results and real-data processing results validate the proposed focusing algorithm.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Rengli Liu and Yanfei Wang
"Extended nonlinear chirp scaling algorithm for highly squinted missile-borne synthetic aperture radar with diving acceleration", J. Appl. Remote Sens. 10(2), 025005 (Apr 18, 2016). ; http://dx.doi.org/10.1117/1.JRS.10.025005


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