Accession Number : AD0775940

Title :   Seismic Studies. Part 1: Seismic and Acoustic Data Processing for Determination of CPA (Closest Point of Approach) and MR (Multi-Range) Vehicle Tracking Parameters.

Descriptive Note : Final rept. 19 Mar-15 Jul 73,


Personal Author(s) : Tanis,F. J.

Report Date : MAR 1974

Pagination or Media Count : 65

Abstract : Existing seismic and acoustic vehicle signature data have been examined for characteristics which will yield two tracking parameters: closest point of approach (CPA) and multi-range (MR). MR refers to a pair of times which correspond to two vehicle/sensor ranges of known ratio. Several signal characteristics were investigated for their utility as predicters of CPA and MR. Signal processing characteristics of peak and time amplitude ratios were found to be useful for CPA and MR identification respectively. A processor was developed to smooth the signal to an integration rate. The time between fixed-size integration segments becomes proportional to an average signal level. While other characteristics were found to produce good CPA and MR times at short ranges, only the integration process was suitable at long ranges (200 m). However, to obtain CPA and MR times sufficiently accurate for an existing tracking algorithm will require more developmental testing and optimization than could be provided within the limits of this study. Preliminary work was also conducted on an acoustic bearing measurement device. Simulation results demonstrated that bearing could be accurately determined using a short-based microphone array. (Author)

Descriptors :   *Seismic detection, *Acoustic detection, *Ground vehicles, Microseisms, Acoustic signals, Signal processing, Acoustic signatures, Bearing(Direction), Computerized simulation, Schematic diagrams

Subject Categories : Acoustic Detection and Detectors
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE