微弱正弦信号的全频域检测方法

Whole frequency detection method of the weak sine signal

基于变型蔡氏电路模型的锁频功能,将被检测信号作为变容二极管的调制信号的一部分,实现了对微弱正弦信号的检测。用四阶龙格-库塔方法对系统相变与调制信号的关系进行了数值实验,发现调制信号频率与系统相变之间存在周期关系,利用这种周期关系,可以实现全频域信号检测。

Based on the frequency locking function of modified Chua's circuit, the detected signal is used as a part of modulation signal of variable capacitance diode, and weak sine signal detection is achieved. Numerical experiment is done by four-order Runge-Kutta algorithm to study the relationship between system's phase change and modulation signal, experiment shows that there is a period relationship between the frequency of modulation signal and system 's phase change, and signal detection of whole frequency range is achieved by using this kind of period relationship.