Fast Implementation Method of Interferometric Synthetic Aperture Radar Raw-Signal Simulation

摘要

Hardware-in-the-loop simulation technology can verify and evaluate the radar by simulate the radio frequency environment. In hardware-in-the-loop simulation system, high-precision of phase is required for interferometric synthetic aperture radar (InSAR) raw-signal simulation. To solvethe problem, a raw signal simulation algorithm which based on up-sampling is proposed. The raw signal is expressed as the convolution of the transmitting signal and the scene modulation signal, and the convolution is then implemented using the fast Fourier transform. Data in process is up-sampledto reduce the phase error which is caused by range sampling approximation. At last, the sampling rate of the raw signal is restored to the origin by decimation in the hardware-in-the-loop simulation system. GPU (Graphic Processing Unit) technology is used to improve the computational efficiency.The actual experimental results show that the method is productive and right.