Abstract
Source positioning based on energy time-inverse focus is a hot subject in the sphere of shallow underground source positioning. Due to the grave wave group aliasing and the complex, irregular geological structure typical of the shallow underground explosion, the reconstruction accuracy of the energy focus is low and thus the recognition of the focus is a difficult task, ultimately leading to a low accuracy of source positioning. To address the above problems, this article proposes a method based on deep learning energy focus recognition, whereby the process of recognizing and positioning the energy focus in an energy field is made equivalent to the end-to-end feature extraction of the energy field-energy focus. The time-variant characteristics of explosive vibration signals are put to use in the construction of an adaptive time window. First, within the time window and by combining cross-correlation and autocorrelation operations, a 3D energy field image sequence in the time-space domain is produced by grouped energy synthesis; second, a densely connected 3DCNN network is built and, through multiple layer span layer splicing, a higher repetitive use is made of the focus point features in the energy field images; third, a spatial pyramid pooling network is used to extract multi-scale features from different focus areas, which helps achieve high-precision focus recognition. Finally, numerical simulations and field tests were conducted.The results demonstrated that compared with the quantum particle swarm optimization (QPSO)-based energy focus search method, the proposed one is more effectively in recognizing the coordinates of the focus in the energy field, thus allowing high-precision localization of shallow underground sources. This method is of some engineering application value in the field of underground source positioning.
Highlights
Distributed source positioning in shallow underground spaces is a location measurement technique that integrates sensing, networking, transmission, and positioning [1]
OF ENERGY FIELD FOCUS RECOGNITION AND POSITIONING So far, researchers mainly use quantum particle swarm optimization (QPSO) and other swarm intelligent optimization algorithms to locate the energy focus by scanning a large area [20]. This method operates on the energy focusing principle, constructs the energy flow objective function using the QPSO algorithm
To address the unsatisfactory recognition and positioning of the energy field focus in shallow underground source positioning, this article proposes an energy field focus searching and positioning method, which is based on and takes advantage of deep learning, a technique used in the field of image recognition
Summary
Distributed source positioning in shallow underground spaces is a location measurement technique that integrates sensing, networking, transmission, and positioning [1] It works by setting up a large number of wireless vibration sensor nodes on the ground and acquiring through these nodes. With the ever-advancing earthquake exploration and computational imaging theory, the positioning technology based on energy field imaging has become a hot subject in the field of underground source positioning It does not depend on the extraction accuracy of the seismic phase characteristic parameters and works by scanning the focus position of the underground energy field to locate the source. It is one of the best ways to solve the problem of shallow underground space source positioning. The time-inverse propagation mode and the imaging conditions of the wavefield are the keys to high-precision time-inverse imaging [13], [14]
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have