Geo-location systems
US6768963B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2002 |
| Grant date | Jul 27, 2004 |
| Priority date | — |
| Expiry date | Aug 20, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/0218
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a geo-location system, the location of an object in space is determined by transmitting polarized signals towards the object. To prevent erroneous determinations due to signals which reach the object after reflection the transmitted signals are polarized. The receiver at the object includes a cross-polarization discriminator and accepts only directly transmitted signals and not reflected signals which have been cross-polarized by the reflection. The transmitted signals may be ultra-wide band signals which can penetrate into buildings. An object whose location can thus be determined can also transmit polarized signals to another object which can not be reached by signals from the original transmitter. Further the ultra-wide band signals may utilize transmission in discontinuous frequency bands to avoid interference with existing systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.