Performance Analysis of Accurate Time Delay and Its Influence on Sonar Beam Formation

Abstract

The time delay accuracy affects the processing performance of the sonar signals. This paper studies the implementation principles of such accurate time delay methods as linear interpolation method, Sinc function interpolation method, Lagrange interpolation method and Farrow filter method and investigates the performance of different accurate time delay methods by simulation as well as the influence of accurate time delay on beam formation. The research results show the images of accurate time delay will be smoother, and lower in side lobe and less in false peak than that of conventional time delay. But both of them have the same beam width.