Research on In-pulse Compensation Method for Imaging Ship Targets in FMCW-ISAR
Wang Yong* Huang Xin
(School of Electronics and Information Engineering, Harbin Institution of Technology, Harbin 150001, China)
Abstract Given its advantages of low cost, low weight, and low power consumption, Frequency Modulated Continuous Wave-Inverse Synthetic Aperture Radar (FMCW-ISAR) has been widely used for imaging many kinds of targets. Since the FMCW signal can be regarded as a pulse signal whose duty ratio is one and pulse duration is relatively long, the motion of targets usually cannot be neglected. In this circumstance, the stop-go assumption is not valid, so ISAR images obtained using the traditional Range-Doppler (R-D) procedure exhibit two-dimensional blurring, which results in decreased resolution. In this paper, we investigate the blur problems of FMCW-ISAR in imaging ship targets, and construct a target motion model. Then, we analyze the influence of the in-pulse motion component in range profiles and final images. We propose a corresponding in-pulse compensation method to improve the resolution of ISAR images. A comparison with the imaging results of real measured echo data verifies the effectiveness of the proposed method in diminishing the 1-D-profile broadening and improving image quality.
Key words ： Frequency Modulated Continuous Wave-Inverse Synthetic Aperture Radar (FMCW-ISAR)
Imaging ship targets
Stop-go assumption
In-pulse compensation
Received: 2018-09-21;
Published: 2018-12-03
Fund: The National Natural Science Foundation of China (61622107, 61871146)
Cite this article:
Wang Yong,Huang Xin. Research on In-pulse Compensation Method for Imaging Ship Targets in FMCW-ISAR[J]. JOURNAL OF RADARS, 0, (): 0-0.
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