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To improve the measurement accuracy of self-integral Rogowski coil, the ahead phenomenon of its wave peak is analyzed. To find the authentic reason of this phenomenon, the equivalent parameter model of the sampling resistor is established. Both the analysis of the equivalent parameter model and experiment results show that distributed inductance in the sampling resistor is the critical factor for...
We can reduce the grounding resistance of grounding object by reducing the resistivity of the soil, increasing the size of the area of ground, selecting the appropriate shape of the grounding (depth of the vertical ground) and increasing the number of vertical ground, etc. However, when the spot area is limited and soil resistivity is high, traditional grounding technology is difficult to achieve...
In order to measure the pulsed magnetic field, a pulsed magnetic field measurement system was developed in this paper, using a sensor called GMR. The output signals of this system were acquired and stored with an oscilloscope. The pulsed magnetic field measurement system was verified by experiments, with the pulsed magnetic field generated by the lightning pulsed magnetic field simulator. The results...
Most research on distributed space-time block coding (D-STBC) has assumed that cooperative relay nodes are perfectly synchronized, for the delay destroys the required spacetime signal structure. However, in most practical distributed scenario, perfect synchronization is hard to achieve. To deal with it, this paper applies front end prefilter (FEP) as a delay synchronization scheme which accomplishes...
A small-size acceleration measurement system based on ARM is designed and developed in this paper. It adopts Micro-machined capacitive integrated chip Model1221 as sensor and SD card as Data memory. Combined with communication port, application software is designed to display, store and deal with the data measured. By measuring the centripetal acceleration of rotating body at a uniform velocity, the...
The paper presents a novel method for demodulating the QAM signals basing on adaptive filtering. The commonly used least mean square (LMS) error adaptive filtering algorithm is employed for studying the demodulating procedure and the performance of the novel adaptive QAM demodulation. The novel adaptive QAM demodulation does not need the adaptive filter completing convergence. Therefore, the sampling...
A three-dimensional (3-D) sensor is proposed for transient electric field measurements in this paper. Three direction components of total fields can be measured simultaneously by using 3-D sensor. The 3-D antenna can convert fields to induced voltages, and the optical transmitter can transform electricity signals to light signals. In order to validate the antenna' s configuration, numerical simulation...
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