电调滤波器自动校频设计与实现

摘要

通过研究电调滤波器自动校频的原理和流程，设计一种基于FPGA＋nios硬件平台的自动校频软件算法，通过对接收信号进行采集、存储和数字处理，实现电调滤波器的精确、快速校频，解决电调滤波器改频时间长及环境温度变化导致频率定位不准确问题，同时简化了电调滤波器繁琐调试工作，提高工作效率，在微波通信设备中得到了很好的验证和应用。%This paper studies the automatic frequency alignment principle and flow of electrically tunable filter,and designs an automatic frequency alignment software algorithm based on FPGA+nios hardware platform.By collecting,storing and processing the out⁃put signal of filter,the algorithm realizes fast and accurate automatic frequency alignment,resolves the problem of inaccurate frequency localization caused by temperature vibration and other changes of external environment of electrically tunable filter,and improves debug efficiency of electrically tunable filter.This algorithm is verified and applied in microwave communication equipment.