基于多频带选择的毫米波成像设备并联型多级滤波器的设计

Design of parallel multistage filter of millimeter wave imaging equipment based on multi band selection

为满足毫米波三维成像设备的数字采集与处理系统能够采集到不同频段回波信息,研究提出了一款基于多频带选择的并联型多级滤波器,旨在有效滤除系统噪声干扰,降低高速A/D转换后的数据速率,减少回波数据有效数据量,满足以太网传输带宽传输速率的要求,实现回波数据的实时传输,且同时满足多个频段的采样要求。根据具体频段信号的实际特性,使用MATLAB设计确定滤波器参数,并将其加载在FPGA;通过测试与比对分析,结果表明本研究所设计的滤波器灵活便捷、高效实用,可有效去除毫米波图像背景噪声,显著提升毫米波图像质量。

In order to meet the requirements of the digital acquisition and processing system of millimeter wave 3D imaging equipment,a parallel multi-stage filter based on multi band selection is proposed to effectively filter out the noise interference of the system,reduce the data speed after high-speed A/D conversion,reduce the effective data amount of echo data and meet the requirements of transmission bandwidth transmission rate of Ethernet,realize the real-time transmission of echo data,and meet the sampling requirements of multiple frequency bands.According to the actual characteristics of specific frequency band signals,the filter parameters are determined by MATLAB design and loaded on FPGA.The results show that the filter designed in this paper is flexible,convenient,efficient and practical,and can effectively remove the background noise of millimeter wave image and improve the quality of millimeter wave image.