摘要
在分析由Duffing振子构成的非线性系统运动特性的基础上,提出了一种新的测定相位和幅值的方法。该方法减小了由于频率的测定误差和噪声对阈值的影响而导致的相位和幅值的测定误差。在Matlab环境下进行了仿真,结果表明:Duf-fing振子可以检测信噪比为-68.451 dB的微弱正弦信号;测定的频率、相位和幅值都有较高的精度;过程简单,便于工程应用。
A new method of measuring amplitude and phase is presented based on the analysis of Dulling oscillator＇s properties and motion. This method can reduce the measurement error of amplitude and phase, which generated from the frequency＇s measurement error and the influence of noises on threshold. Matlab is used to solve Duffing equation and the results show that using Dulling oscillator can detect weak sine signal of --68. 451 dB. The methodl has a high measure precision of frequency, amplitude and phase and is suitable for engineering application for its simple detecting process.
出处
《传感技术学报》
CAS
CSCD
北大核心
2009年第8期1137-1141,共5页
Chinese Journal of Sensors and Actuators
