基于FPGA多带宽合成孔径雷达系统的数字接收技术

Digital receiving technology of multi-bandwidth synthetic aperture radar system based on FPGA

针对传统多带宽合成孔径雷达系统需要多个滤波器和多种采样时钟等问题,提出一种新的数字处理方法,并详细介绍了算法方案、仿真结果和基于现场可编程门阵列(FPGA)的算法实现.该方法仅需一个最高频率的采样时钟获取离散化数据,通过对数据的插值得到其他较低时钟频率的数据,而对不同带宽信号的滤波由数字滤波器来实现.这种方法简化了系统设计,提高了系统可靠性.

Considering the problems in traditional multi-bandwidth synthetic aperture radar （SAR） system,such as too many filters and sampling clocks,we present a new digital processing scheme.This scheme needs only one highest frequency sampling clock to obtain the discrete data;other data with lower frequencies can be acquired by interpolation;and digital filter fulfills the function of filtering signals with different bandwidths.This technique simplifies the design of the SAR system and improves the reliability.The architecture of the algorithm,the simulation results,and the implementation of the algorithm based on FPGA are expounded in detail.