摘要
利用超外差式接收和直接数字合成(DDS)技术设计了高频地波雷达频谱监测系统的前端电路.该电路能够根据雷达探测距离的远近选择相对应的噪声信号接收频段,为后续的数据采集与处理提供噪声电平数据.实验证明:本系统的跳频本振信号信噪比(SNR)优于60dB;对输入信号具有60dB左右的增益和1μV的灵敏度,满足了武汉大学研制的下一代高频地波海态监测雷达对频谱监测的需要.
The design of a frontend circuit in the shortwave noise spectrum monitoring system is made by utilizing superheterodyne reception and direct digtal synthesis techniques.This circuit takes advantage of PC to choose the monitoring frequency range in accordance with the detecting distance of radar and provides the signal source for the latter data acquisition and processing system. Experiments prove this frontend system may produce a skipping frequency local oscillation with SNR exceeding 60 dB,achieve the gain beyond 60 dB to the input signal,and obtain the sensitivity about 1 μV.This frontend can satisfy the requirement of spectrum monitoring of high frequency ground wave radar made by Wuhan University.
出处
《武汉大学学报（理学版）》
CAS
CSCD
北大核心
2003年第5期653-657,共5页
Journal of Wuhan University:Natural Science Edition
基金
国家"十五"计划资助项目(2001AA631050)
