Share Email Print
cover

Proceedings Paper

Seismic bearing
Author(s): Dennis Power
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Textron Systems (Textron) has been using geophones for target detection for many years. This sensing capability was utilized for detection and classification purposes only. Recently Textron has been evaluating multiaxis geophones to calculate bearings and track targets more specifically personnel. This capability will not only aid the system in locating personnel in bearing space or cartesian space but also enhance detection and reduce false alarms. Textron has been involved in the testing and evaluation of several sensors at multiple sites. One of the challenges of calculating seismic bearing is an adequate signal to noise ratio. The sensor signal to noise ratio is a function of sensor coupling to the ground, seismic propagation and range to target. The goals of testing at multiple sites are to gain a good understanding of the maximum and minimum ranges for bearing and detection and to exploit that information to tailor sensor system emplacement to achieve desired performance. Test sites include 10A Site Devens, MA, McKenna Airfield Ft. Benning, GA and Yuma Proving Ground Yuma, AZ. Geophone sensors evaluated include a 28 Hz triax spike, a 15 Hz triax spike and a hybrid triax spike consisting of a 10 Hz vertical geophone and two 28 Hz horizontal geophones. The algorithm uses raw seismic data to calculate the bearings. All evaluated sensors have triaxial geophone configuration mounted to a spike housing/fixture. The suite of sensors also compares various types of geophones to evaluate benefits in lower bandwidth. The data products of these tests include raw geophone signals, seismic features, seismic bearings, seismic detection and GPS position truth data. The analyses produce Probability of Detection vs range, bearing accuracy vs range, and seismic feature level vs range. These analysis products are compared across test sites and sensor types.

Paper Details

Date Published: 5 May 2009
PDF: 11 pages
Proc. SPIE 7333, Unattended Ground, Sea, and Air Sensor Technologies and Applications XI, 73330Y (5 May 2009); doi: 10.1117/12.821020
Show Author Affiliations
Dennis Power, Textron Systems Corp. (United States)


Published in SPIE Proceedings Vol. 7333:
Unattended Ground, Sea, and Air Sensor Technologies and Applications XI
Edward M. Carapezza, Editor(s)

© SPIE. Terms of Use
Back to Top