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| Range Scaling Compensation Method Based on STOLT Interpolation in Broadband Squint SAS Imaging |
| WANG Jinbo① TANG Jinsong② ZHANG Sen② ZHONG Heping② |
①(College of Electronic Engineering, Naval University of Engineering, Wuhan 430033, China)
②(Naval Institute of Underwater Acoustic Technology, Naval University of Engineering, Wuhan 430033, China) |
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Abstract Considering the problem of large squint synthetic aperture sonar imaging, the analytical expression of the wavenumber spectrum is analyzed in detail in the radial and azimuth wavenumber fields under the wide-band high-squint conditions. The spectrum winding and shrink in the distance wavenumber fields after the Stolt interpolation are pointed out, and the reduced relative distance between the target in the imaging result is also indicated, then the Stolt interpolation method for distance wavenumber spectrum winding is given. The concept of range wavenumber scaling factor is proposed, the method of compensating the scaling factor and the spectrum winding in the distance space are given. Finally, the problem of range scaling caused by Stolt interpolation under large oblique angle is solved by compensating the distance variable in distance space. Point object simulation data and simulated echo data processing verify the correctness and validity of the proposed method.
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Received: 16 November 2017
Published: 11 May 2018
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| Fund:The National Natural Science Foundation of China (61671461, 41304015) |
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Corresponding Authors:
WANG Jinbo
E-mail: wjbnavy@126.com
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