Accession Number : ADD017822

Title :   System and Method for Rapidly Tracking Vehicles of Special Utility in Low Signal-to-Noise Environments.

Descriptive Note : Patent, Filed 18 Oct 94, patented 28 Nov 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Davis, John S ; Gong, Kai F ; Hammel, Sherry E

Report Date : 28 Nov 1995

Pagination or Media Count : 12

Abstract : This report describes a system for facilitating the tracking of a target vehicle in connection with successively-received acoustic sensor signal data items. A fast Fourier transform operation is performed in connection with each successive acoustic sensor signal data item to generate a phase and amplitude beam map reflecting spectral signal energy in the received acoustic sensor signal data item. If the beam map for a acoustic sensor signal data item indicates that the item represents a signal having a signal-to-noise ratio above a first predetermined threshold value, a beam map generated for a previous acoustic sensor signal data item is used to generate a bounded beam map, a determination is made as to whether the bounded beam map represents a signal having a second predetermined signal-to-noise ratio. In response to a positive determination for the latter signal-to-noise determination, both the beam maps are used to generate tracking information for the target vehicle.

Descriptors :   *SURFACE TARGETS, *ACOUSTIC DETECTORS, *PATENTS, *ACOUSTIC TRACKING, *UTILITY VEHICLES, ENVIRONMENTS, HIGH RATE, THRESHOLD EFFECTS, SIGNAL TO NOISE RATIO, OPERATION, MAPS, FAST FOURIER TRANSFORMS, LOW RATE

Subject Categories : Surface Transportation and Equipment
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE