CAJ | 학술논문

针对数字锁定放大器中稀疏分解算法检测精度受限的缺点,结合非线性方法进行补偿,采用混沌检测联合稀疏分解的算法设计了数字锁定放大器。数字锁定放大器借助稀疏分解算法估计信号参数,根据估计得到的参数设计对应混沌系统；利用混沌系统检测信号的过程中产生间歇性混沌状态,并通过测量间歇性混沌状态的周期,精确检测信号。最终,在信号的信噪比低至-20 dB时可以成功检测信号,频率精度达到0.05 Hz,提供了一种非线性微弱信号检测方法。
침대수자쇄정방대기중희소분해산법검측정도수한적결점,결합비선성방법진행보상,채용혼돈검측연합희소분해적산법설계료수자쇄정방대기。수자쇄정방대기차조희소분해산법고계신호삼수,근거고계득도적삼수설계대응혼돈계통；이용혼돈계통검측신호적과정중산생간헐성혼돈상태,병통과측량간헐성혼돈상태적주기,정학검측신호。최종,재신호적신조비저지-20 dB시가이성공검측신호,빈솔정도체도0.05 Hz,제공료일충비선성미약신호검측방법。
For the disadvantage of high computational complexity in sparse decomposition algorithm, the digital lock-in amplifier based on non-linear method and chaos detection joint sparse decomposition algo-rithm is designed. With the help of sparse decomposition algorithm,the digital lock-in amplifier estimates the signal parameters and according to the estimated parameters corresponding chaotic systems are de-signed. The intermittent chaos state in the process of chaotic oscillator and its period are used to detect sig-nals. The precision of frequency is up to 0. 05 Hz when the signal-to- noise ratio( SNR) is low to -20 dB,so this paper provides a nonlinear method of weak signal detection.