Simulation research of partial discharge ultrasonic array orientating based on improved FastDOA

A new method for ultrasonic array orientating of partial discharge (PD) is presented based on the improved FastDOA algorithm. This method expands a real sensor array into several virtual arrays to enhance the resolution. Each virtual array´s aperture size is different and bigger than the original array´s, then averaging the spatial spectrum of the virtual arrays to restrain the spurious peaks because of the consistency of real peak´s size and position. Simulation results of Matlab prove this method has a high stability.