基于直接数字频率合成器的侦察接收机的设计和控制

The Design and Control of Scouting Receiver Based On DDS

提出了一种通过控制直接数字频率合成器芯片AD9850产生自动/手动可调的正弦扫频信号以获得本振信号,实现了10MHz-108MHz内全频范围、特定频率范围和指定频率自动和手动搜索,自动显示搜索到的外来信号频率并掉电存储,同时可鉴别外来信号的调制方式:调频、调幅、等幅的方法。

This paper presents a way of producing automatic / manual adjustable sine sweep signal to obtain the local oscillator signal by controlling the DDS（direct digital frequency synthesizer） chip AD9850,achieving automatic and manual search within the full-10MHz-108MHz frequency range,a specific frequency range and specify the frequency,automatically displaying the search to the external signal frequency and power-down stores while identifying external signal modulation mode： FM,AM,amplitude method.