Interferometric Synthetic Aperture Sonar Signal Processing for Autonomous Underwater Vehicles Operating in Shallow Water.

摘要

There are various processing techniques used with InSAS data to determine bathymetric heights. In this research new methods are tested using synthetic data and compared with existing methods. Improvements come from the use of Chirp-Scaling, a phase preserving beamforming technique to form a SAS image; an interferometric Vernier method to unwrap the phase; and confirming the direction of arrival with the MUltiple SIgnal Channel (MUSIC) estimation technique. The fusion of Chirp-Scaling, Vernier, and MUSIC affords stability in the bathymetric height measurement as well as improved resolution. The methods are computationally faster and use less memory than existing techniques.