基于软件无线电的气象传真接收系统优化设计

摘要

为有效解决模拟解调气象传真接收机的精度和灵敏度低、抗干扰能力差等问题,提出基于软件无线电的气象传真接收系统优化方案.该系统采用J型场效应管、ESD保护电路和滤波电路等构建水准匹配的电小有源天线;采用超外差接收机技术、电调谐滤波器技术、数字解调技术、FFT同步算法、Rife频偏估计算法及基于DSTFT的FSK算法构建气象传真接收机信息接收和处理单元,实现气象传真信号的接收、数字解调、处理和显示.试验结果表明:该系统能完成气象传真信号的解调和气象传真图的恢复,图像质量和视觉效果均得到很大改善.%In order to effectively solve the problems of low precision,low sensitivity and poor anti-interference ability of common analog meteorological facsimile receiver,an optimization design of meteorological facsimile receiver based on the software radio is proposed.The receiver features a small active receiving antenna with noise matching (which consists of the J type FET,the ESD protection circuit and the filter circuit),the super-heterodyne reception,electrically tunable filter,digital demodulation and the FFT synchronization algorithm,Rife,DSTFT based FSK.