Raw Signal Simulation for Multi-Circular Synthetic Aperture Imaging at Terahertz Frequencies

Raw signal simulation is an important tool to test the effectiveness of the system parameters and imaging algorithms. A fast raw signal simulation method for multi-circular synthetic aperture imaging is proposed based on the inverse processing of the imaging algorithm and the nonuniform fast Fourier transform. The analytical description and processing procedure are presented. Simulation results of an ideal point target and a human model demonstrate the validity and effectiveness. Compared with the common time-domain method, the proposed method can achieve equivalent performance with higher efficiency.