Anti-Geolocation
US9201132B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 2012 |
| Grant date | Dec 1, 2015 |
| Priority date | — |
| Expiry date | Dec 18, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/0413
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods, apparatus, and articles of manufacture make Geolocation of a source transmitter more difficult or impossible. Scatterers common to a source transmitter and an intended receiver are identified using a variety of techniques, such as iterative time reversal (ITR) and Singular Value Decomposition (SVD) of a scatter matrix. The source transmitter then uses time reversal and knowledge of the signatures of the scatterers to focus its transmissions on one or more of the scatterers, instead of the intended receiver. The source transmitter may have multiple antennas or antenna elements. The source transmitter and/or the intended receiver may include antenna elements with Near-Field Scatterers to enable spatial focusing below the diffraction limit at the frequencies of interest. The source transmitter may be a plurality of ad hoc nodes cooperating with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.