Synthetic aperture sonar imaging using joint time-frequency analysis

The non-ideal motion of the hydrophone usually induces the aperture error of the synthetic aperture sonar (SAS), which is one of the most important factors degrading the SAS imaging quality. In the SAS imaging, the return signals are usually nonstationary due to the non-ideal hydrophone motion. In this paper, joint time-frequency analysis (JTFA), as a good technique for analyzing nonstationary signals, is used in the SAS imaging. Based on the JTFA of the sonar return signals, a novel SAS imaging algorithm is proposed. The algorithm is verified by simulation examples.

[1]  Qinye Yin,et al.  Adaptive chirplet based signal approximation , 1998, Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181).

[2]  Simon Haykin,et al.  The chirplet transform: physical considerations , 1995, IEEE Trans. Signal Process..

[3]  F. Berizzi,et al.  Autofocusing of inverse synthetic aperture radar images using contrast optimization , 1996, IEEE Transactions on Aerospace and Electronic Systems.

[4]  Shie Qian,et al.  Joint time-frequency transform for radar range-Doppler imaging , 1998 .

[5]  R. L. Thompson,et al.  Methods of estimating allowable motion perturbations in side-scan sonar systems , 1996 .

[6]  Charles V. Jakowatz,et al.  Phase gradient autofocus-a robust tool for high resolution SAR phase correction , 1994 .

[7]  Stéphane Mallat,et al.  Matching pursuits with time-frequency dictionaries , 1993, IEEE Trans. Signal Process..

[8]  Mehrdad Soumekh.  Airborne synthetic aperture acoustic imaging , 1997, IEEE Trans. Image Process..

[9]  Peter T. Gough,et al.  Imaging algorithms for a strip-map synthetic aperture sonar: minimizing the effects of aperture errors and aperture undersampling , 1997 .

[10]  Victor C. Chen.  Reconstruction of inverse synthetic aperture radar image using adaptive time-frequency wavelet transform , 1995, Defense, Security, and Sensing.

[11]  Victor C. Chen.  Radar ambiguity function, time-varying matched filter, and optimum wavelet correlator , 1994, Defense, Security, and Sensing.

[12]  M. E. Zakharia,et al.  Synthetic aperture sonar for seabed imaging: relative merits of narrow-band and wide-band approached , 1992 .

[13]  R. McHugh,et al.  Efficient digital signal processing algorithm for sonar imaging , 1996 .

[14]  C.F.N. Cowan,et al.  Interferometric synthetic aperture sonar for high resolution 3-D mapping of the seabed , 1997 .

[15]  L. C. Trintinalia,et al.  Joint time-frequency ISAR using adaptive processing , 1997 .

[16]  Shie Qian,et al.  Signal representation using adaptive normalized Gaussian functions , 1994, Signal Process..