Real-time Measurement Method of Grid Impedance with Resonant Characteristics for Control of Distributed Power Generation Systems

2021 ◽  
Author(s):  
Takaya Sekiguchi ◽  
Keiji Wada
Keyword(s):  
Power Generation ◽  
Real Time ◽  
Measurement Method ◽  
Time Measurement ◽  
Distributed Power ◽  
Distributed Power Generation ◽  
Real Time Measurement ◽  
Grid Impedance ◽  
Power Generation Systems

Real-Time Measurement Method of Doppler Based on GPS Carrier Signals

2012 ◽  
Vol 226-228 ◽  
pp. 2050-2055 ◽  
Author(s):  
Shao Feng Dong ◽  
Bao Qiang Du ◽  
Wei Zhou
Keyword(s):  
Frequency Shift ◽  
Real Time ◽  
Measurement Method ◽  
Dynamic Range ◽  
Time Synchronization ◽  
Influencing Factor ◽  
Doppler Frequency ◽  
Time Measurement ◽  
Time Frequency ◽  
Real Time Measurement

According to Doppler effect of satellite on the time synchronization technology between satellite and the ground station, a real-time measurement method of Doppler is proposed based on GPS carrier signals. Using Doppler observations from GPS receiver, the method can real-timely measure Doppler frequency shift of GPS including dynamic Doppler and media Doppler whose error can be timely modified in the receiver end. Simulation results show that the frequency shift caused by dynamic Doppler, a main influencing factor in the course of transmission of time-frequency signal by GPS satellite, is between plus or minus several thousands Hz. Comparing to traditional measurement method of Doppler, the method makes it possible to fast track phase of signal in large dynamic range in synchronous technology.

Real-Time Measurement Method for Retardation of Eighth Waveplate Independent of Fast Axis

2011 ◽  
Vol 38 (5) ◽  
pp. 0508002 ◽  
Author(s):  
朱玲琳 Zhu Linglin ◽  
曾爱军 Zeng Aijun ◽  
李凡月 Li Fanyue ◽  
黄惠杰 Huang Huijie
Keyword(s):  
Real Time ◽  
Measurement Method ◽  
Time Measurement ◽  
Fast Axis ◽  
Real Time Measurement
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