Seismic Method For Vehicle Detection And Vehicle Weight Classification
First Claim
1. A method for detecting the passage of vehicles, comprising the steps of:
- locating a geophone on the ground at a known location and,processing the signals from the geophone to derive a density statistic corresponding to the number of peaks of the geophone signal above a threshold set above a measured background level, whereby the number of peaks above the threshold indicate the presence of a vehicle.
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Abstract
A system is provided for detecting the passage of vehicles and the classification thereof by weight using geophone outputs and a unique density measurement in which the number of peaks of the geophone signal above a predetermined threshold over a number of time frames indicates the presence of a vehicle, with the number of time frames in which the density exceeds the threshold indicating whether the vehicle is a heavy vehicle such as a tank, or a light vehicle such as a car, with the threshold eliminating both manmade and natural noise, as well as distinguishing seismic vibrations due to personnel and animals. In one embodiment, various thresholds are utilized to detect the onset of vehicle presence and the end of the event.
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Citations
22 Claims
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1. A method for detecting the passage of vehicles, comprising the steps of:
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locating a geophone on the ground at a known location and, processing the signals from the geophone to derive a density statistic corresponding to the number of peaks of the geophone signal above a threshold set above a measured background level, whereby the number of peaks above the threshold indicate the presence of a vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A battery powered method for vehicle detection over a long period of time utilizing components of zero or small current drains, thus to extend battery life, comprising the steps of:
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sensing seismic activity produced by a vehicle using a geophone and, using a low-power drain processor for processing the geophone output signal to indicate the presence of a vehicle, whereby vehicle surveillance can be maintained over long periods of time. - View Dependent Claims (16)
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17. A system for detecting the presence of a vehicle using seismic measurements, comprising:
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a geophone placed on the earth at a known location, a processor coupled to the geophone for processing the geophone output for detecting a density statistic indicative of the proximity of a vehicle to the geophone. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification