Focusing wide bandwidth and wide swath synthetic aperture sonar data using modified nonlinear chirp-scaling imaging algorithm

Zhen Tian; He-Ping Zhong; Jin-Song Tang

doi:10.1117/12.2064055

16 April 2014 Focusing wide bandwidth and wide swath synthetic aperture sonar data using modified nonlinear chirp-scaling imaging algorithm

Zhen Tian, He-Ping Zhong, Jin-Song Tang

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Proceedings Volume 9159, Sixth International Conference on Digital Image Processing (ICDIP 2014); 915909 (2014) https://doi.org/10.1117/12.2064055
Event: Sixth International Conference on Digital Image Processing, 2014, Athens, Greece

Abstract

To solve the Synthetic Aperture Sonar (SAS) imaging problem with a wide bandwidth transmitted signal and a wide swath, a novel modified Nonlinear Chirp-Scaling (NCS) imaging algorithm is proposed. The first key step is to reduce the phase error by preserving the fourth order of the Taylor expansion for two-dimensional spectrum. To compensate the high order phase error sufficiently, the second key step is to derive a series of more exact relational parameters resulted from the third and fourth phase filtering and NCS operation by considering the change of linear and second nonlinear for equation frequency modulation slant rate. This operation increases the wide of swath for SAS with a wide bandwidth transmitted signal. The results of simulation show the accuracy and validity of the proposed modified NCS algorithm.

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Zhen Tian, He-Ping Zhong, and Jin-Song Tang "Focusing wide bandwidth and wide swath synthetic aperture sonar data using modified nonlinear chirp-scaling imaging algorithm", Proc. SPIE 9159, Sixth International Conference on Digital Image Processing (ICDIP 2014), 915909 (16 April 2014); https://doi.org/10.1117/12.2064055

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KEYWORDS

Detection and tracking algorithms

Computer simulations

Nonlinear filtering

Algorithm development

Doppler effect

Frequency modulation

Fourier transforms

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