The Parameter Estimation of Double Exponential Pulse Based on a Least Infinity Norm Fitting Method

This paper presents an estimation method of double exponential pulse (DEP) between the physical parameters rise time (t r), full width at half maximum amplitude (t FWHM) and the mathematical parameters α, β. A newly fitting method based on the least infinity norm criterion is proposed to deal with the estimation problem of DEP. The calculation process and equation of parameters of this method is proposed based on an m-th-order polynomial fitting model. This estimation method is compared with the least square method by the same data and fitting function. The results show that the maximum estimation error of parameters of double exponential pulse obtained by the least infinity norm method is 1.5 %.

Experiments and Analyses of Horizontal Earth Electrodes’ TGR on Various Grounds

In this paper, a new type of portable horizontal grid earth electrode has been designed for mobile equipments. With the impulse ground measurement system, the responses to double exponential pulse current of five earth electrodes in two arrangements have been tested on soil, grassplot and cement floor respectively. After filtering and calculating, the curve of transient grounding resistance (TGR) in time domain can be gotten. And in the end, some conclusions have been drawn. The analysis of discharging capacity of horizontal grid earth electrodes in time domain has great significance in the design of mobile equipments’ earth devices.

Design of Miniature Dual Exponential Pulse Source Using EMC Experiment

Based on avalanche effect of avalanche transistor, Marx circuit configuration is adopted, trigger circuit and PCB layout are described in detail. The all-solid-state pulse source is designed with 10-stages Marx circuit. The test results demonstrate that its output impedance is 50Ω, the pulse width is 10ns approximately, pulse voltage is about 1.5kV,the rise time of the positive pulse is less than 2ns, the fall time of negative pulse is about 3ns, the operating frequency is 10kHz, coefficient of variation for voltage peak, fall time and pulse width is less than 5%, which is suitalbe as interference source for the EMC experiment.