ωk algorithm for multi-receiver synthetic aperture sonar based on exact analytical two-dimensional spectrum

Abstract

Based on the method of deriving two-dimensional wavenumber spectrum by using instantaneous Doppler wavenumber in bistatic synthetic aperture radar, the analytical solution of two-dimensional wavenumber spectrum of multi-receiver synthetic aperture sonar (SAS) was deduced, and the analytical expression of the half-quasi-bistatic angle was obtained under the non-stop-and-go assumption. Based on the derived two-dimensional wavenumber spectrum, the ωk algorithm suitable for multi-sub-array SAS was proposed, which solved the problem that using the displacement phase centre approximation cannot well adapt to the wide mapping area imaging, and the correctness and validity of the algorithm have been verified by the simulation data and the lake experiment data.

Keywords

• synthetic aperture sonar
• approximation theory
• sonar imaging
• two-dimensional spectrum
• two-dimensional wavenumber spectrum
• instantaneous doppler wavenumber
• bistatic synthetic aperture radar
• multireceiver synthetic aperture sonar
• half-quasibistatic angle
• ωk algorithm
• exact analytical two-dimensional spectrum
• non-stop-and-go assumption
• multisubarray sas
• e displacement phase centre approximation
• wide mapping area imaging