Weak Signal Phase Measurement Method Based on Duffing Oscillator

摘要：

If the SNR (Signal to Noise Rate) of sampling data is less than-WdB,the signal is usually called weak signal. Initial phase measurement of weak sine signal has extensive engineering application merits. When the system parameter is near its threshold,the phase to be measured is also has corresponding threshold,because the threshold is the inflexion of the system state transition,then the phase before changed can be measured by controlling the change of the phase. The main factors of measurement error are those characteristic parameters of the sampling data used in the measurement,such as signal-to-noise rate,number of samples per period of the signal to be measured and number of sampling periods,and those methods of the measurement,such as delay sampling,zeros space,dichotomy search and quartation of unit circle,but not parameters of simulation environment. In simulation experiment,when the signal-to-noise rate is-10dB and the frequency of the signal to be measured is known,the relative measurement error is possibly reduced to less than 1%.

关键词： weak signal phase measurement Duffing oscillator quartation.

作者: Wei Chen Meng Chen Zhe Zhang Aihua Xu

作者单位: Ordnance Engineering College,Shijiazhuang 050003,China Training Department,Armored Force Engineering College,Beijing 100071,China

会议类型: 国际会议

会议名称: 2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)

会议地点: 北京

会议语种:英文

页码: 964-968

在线出版日期: 2009-08-16（万方平台首次上网日期，不代表论文的发表时间）