Volume 8 Issue 3
Jun.  2019
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Article Navigation >  Journal of Radars  > 2019  >  8(3): 373-381
WANG Yong and HUANG Xin. Research on in-pulse compensation method for imaging ship targets in FMCW-ISAR[J]. Journal of Radars, 2019, 8(3): 373–381. doi: 10.12000/JR18079
Citation: WANG Yong and HUANG Xin. Research on in-pulse compensation method for imaging ship targets in FMCW-ISAR[J]. Journal of Radars, 2019, 8(3): 373–381. doi: 10.12000/JR18079
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Research on In-pulse Compensation Method for Imaging Ship Targets in FMCW-ISAR

DOI: 10.12000/JR18079

  • School of Electronics and Information Engineering, Harbin Institution of Technology, Harbin 150001, China

Funds:  The National Natural Science Foundation of China (61622107, 61871146)
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  • Corresponding author: WANG Yong, wangyong6012@hit.edu.cn
  • Received Date: 2018-09-21
  • Rev Recd Date: 2018-11-20
    • Available Online: 2018-12-03
  • Publish Date: 2019-06-01
    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.

     

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