Passive identification of friend vs. foe apparatus and method
US5583507A · kind A · utility
33Cited by
12References
56Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 19, 1995 |
| Grant date | Dec 10, 1996 |
| Priority date | — |
| Expiry date | Apr 19, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/024
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for passive identification includes a series of elements preferably in the form of strips, bars or other geometric shapes, or as dipole antennas made of a material having variable EM retro-reflectivity characteristics. By varying the characteristics of individual elements (i.e. spatial, polarization, frequency response and angular extent of retro-reflection), the elements form an alterable pattern which can be used for identification. The characteristics can be changed remotely, the ability of the device to understand and implement the change being a criterion for identification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.