高分辨雷达目标回波模拟器设计

研究实现了一种基于宽带数字射频存储器和数字图像合成器的高分辨雷达目标回波模拟器。该模拟器采用去斜率解调和调制处理来降低系统中频处理带宽,从而降低了系统复杂程度。设计了一种基于高性能FPGA的数字图像合成器来实现高分辨雷达目标回波的模拟功能,推导并分析了数字图像合成器的工作过程。最后,以一个128个距离单元的数字图像合成器来合成一个运动飞机目标为例,将其压缩图像与计算得到的该飞机距离像进行了比较,结果表明该模拟器可以逼真的模拟复杂目标一维距离像。

Design of high resolution radar echo simulator

A design of high resolution radar echo simulatosrs based on the digital RF memory and digital image synthesizer is presented.Stretch processing is used to demodulate and remodulate the wideband chirp signal,which can reduce the system IF bandwidth,and reduce the complicated degree of the system remarkably.A digital image synthesizer based on high performance FPGA is designed to carry out the target echo simulating function of this simulator,and the processes of the digital image synthesizer are deduced and analyzed.Finally,a digital image synthesizer with 128 range cells is built to synthesize the echo of a moving airplane.The image is compared with the calculation result by FDTD method,and the results show that this echo simulator can synthesize the 1-D range image of complex targets realistically.