基于GRECO的复杂目标ISAR图像仿真

提出一种与图形电磁计算方法相结合的1SAR图像实时仿真方法.利用图形电磁计算(GRECO)方法得到运动目标的电磁散射数据,通过发射线性调频信号得到运动目标的雷达回波,并对仿真回波进行ISAR成像处理.与传统采用点目标仿真不同,该文是对实际三维目标直接仿真成像,更加接近实际,更加适合应用与成像效果分析、算法改进和抗干扰方面的研究.对于目标表面散射场的分析,是基于高频预估理论:采用物理光学(PO)法与物理绕射理论(PTD)来进行计算.从对复杂目标的仿真结果来看,该方法是准确有效且具有实时性的.

Simulation of ISAR image of complex targets based on GRECO

In this paper,an ISAR imaging simulation method combined with graphical electromagnetic computing(GRECO) technique is introduced.The electromagnetic scattering data of maneuvering targets is obtained by using of GRECO.The radar echo of maneuvering targets is got by transmitting linear FM signal and an ISAR imaging of simulated echo is carried out.Different from point target simulation,3D target simulation and imaging is very similar to the reality and is more suitable for application and imaging effects analysis and study of algorithm improvement and anti-interference.The scattering field of target surface is analyzed based on high frequency predict theory and is calculated based on the physical optics(PO) method and physical theory of diffraction(PTD).The ISAR images can be obtained with different motion compensation methods and reconstruction algorithms.The simulation results of complex target show that the method has the characteristics of correctness,effectiveness,and real-time performance.