First Arrival Picking of Aircraft-Excited Seismic Waves Based on Energy Distribution

When the acoustic-to-seismic coupling effect is used to detect low-altitude aircrafts, picking up the exact first arrival of the seismic waves excited by aircrafts directly affects the accuracy of the detection. There are random noise and frequent impulse noise in seismic data collection due to wind blowing, grass hitting, and so on. The existing seismic wave picking algorithms are sensitive to the impulse noise, which leads to high false picking rate. In order to solve this problem, first arrival picking of aircraft-excited seismic waves based on energy distribution (ED) is proposed in this article. Compared with the commonly used pickup algorithms, ED can avoid the false pickup caused by single impulse noise and effectively reduce the false picking caused by impulse noise clusters consisted of multiple consecutive single impulse noise. ED ensures both high accuracy and high computational efficiency. More importantly, the actual collected data may contain multiple aircraft events, and ED can pick up all the aircraft events at the same time and does not need to intercept each aircraft signal one by one. By picking up the actual data, the effectiveness and practicability of ED are further verified. The advantages and limitations of the ED algorithm are also discussed to provide future research directions.