Roy J. Greenfield

Learn More
Ž. We compare the ability of several practical ground-penetrating radar GPR array processing methods to improve Ž. signal-to-noise ratio SNR , increase depth of signal penetration, and suppress out-of-plane arrivals for data with SNR of Ž. Ž. roughly 1. The methods include two-dimensional 2-D monostatic, three-dimensional 3-D monostatic, and 3-D bistatic(More)
The distinguishing spatial properties of low-frequency microphone wind noise (turbulent pressure disturbances) are examined with a planar, 49-element array. Individual, propagating transient pressure disturbances are imaged by wavelet processing to the array data. Within a given frequency range, the wind disturbances are much smaller and less spatially(More)
We demonstrate a practical method for automatically adapting a network of seismic unattended UGSs to their specific geologic setting. The demonstration relies on data generated from high-fidelity 3D seismic simulations of a moving vehicle traversing a complex terrain having heterogeneous geology, and significant topographic relief. The simulated data,(More)
A method was developed to predict the distribution of seismic source mislocation errors for tracked vehicles using bearing and range (r) location statistics obtained from field data. The method is of use for 1) guiding the design and deployment of seismic sensor networks and 2) statistically modeling seismic network tracking performance. In the present(More)
Dynamic mechanical activity in a tunnel can be measured as ground vibrations at offset distances. These signals can be processed in sensing algorithms for detection, location, and discrimination of the activity. The objective of this work is to demonstrate that seismic simulations can reveal the effect of the environment on seismic energy as it propagates(More)
  • 1