<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The conventional Chirp Scaling Algorithm is mainly used in side looking or small squint angle mode of synthetic aperture imaging. In application of synthetic sonar, the large squint angle imaging is often required and the range-azimuth coupling is serious. On the basis of studying the principle of the conventional Chirp Scaling Algorithm, we improved the imaging algorithm in large squint mode. We analysed the structure of the echo frequency spectrum and the compensation of phase factor. The improved imaging algorithm designs a more precision of phase compensation factor, and eliminates the high order degree of range and azimuth coupling in the specific mapping band. Any target point is simulated in imaging region by using the improved algorithm. The simulation conclusion showed that the improved Chirp Scaling Algorithm is able to meet the imaging focus and is more suitable to slant imaging as compared with the traditional algorithm.</p></abstract>

The conventional Chirp Scaling Algorithm is mainly used in side looking or small squint angle mode of synthetic aperture imaging. In application of synthetic sonar, the large squint angle imaging is often required and the range-azimuth coupling is serious. On the basis of studying the principle of the conventional Chirp Scaling Algorithm, we improved the imaging algorithm in large squint mode. We analysed the structure of the echo frequency spectrum and the compensation of phase factor. The improved imaging algorithm designs a more precision of phase compensation factor, and eliminates the high order degree of range and azimuth coupling in the specific mapping band. Any target point is simulated in imaging region by using the improved algorithm. The simulation conclusion showed that the improved Chirp Scaling Algorithm is able to meet the imaging focus and is more suitable to slant imaging as compared with the traditional algorithm.

Improved Chirp Scaling Algorithm for Processing Squinted Mode Synthetic Aperture Sonar Data

Engineering Practice Training Center, Northwestern Ploytechnical University, Xi’an,

School of Marine Science And Technology, Northwestern Ploytechnical University, Xi’an,

Northwestern Ploytechnical University Ming De College, Xi’an,

Cybernetics and Information Technologies

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The conventional Chirp Scaling Algorithm is mainly used in side looking or small squint angle mode of synthetic aperture imaging. In application of synthetic...

Improved Chirp Scaling Algorithm for Processing Squinted Mode Synthetic Aperture Sonar Data

Published Online: Jan 25, 2017

Page range: 111 - 122

DOI: https://doi.org/10.1515/cait-2016-0081

Keywords
Synthetic aperture sonar, Chirp Scaling Algorithm, range-azimuth coupling, secondary range compression, Taylor series, Fresnel assumption

© 2016 Naiqiang Fan et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Improved Chirp Scaling Algorithm for Processing Squinted Mode Synthetic Aperture Sonar Data

Published Online: Jan 25, 2017

Page range: 111 - 122

DOI: https://doi.org/10.1515/cait-2016-0081

KeywordsSynthetic aperture sonar, Chirp Scaling Algorithm, range-azimuth coupling, secondary range compression, Taylor series, Fresnel assumption

© 2016 Naiqiang Fan et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Synthetic aperture sonar, Chirp Scaling Algorithm, range-azimuth coupling, secondary range compression, Taylor series, Fresnel assumption