System and method for rapidly tracking vehicles of special utility in low signal-to-noise environments
US5471434A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1994 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Oct 18, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S11/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for facilitating the tracking of a target vehicle in connection h 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.