Synthetic aperture radar system and method for local positioning
US7250901B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 3, 2003 |
| Grant date | Jul 31, 2007 |
| Priority date | — |
| Expiry date | Jul 3, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2013/468
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A positioning system includes a passive, isotropic reflecting landmark at a fixed position and a device. The device transmits an electromagnetic pulse having a circular polarization and receives a return signal over a period of time. The return signal includes a reflected pulse from the reflecting landmark. The processes the return signal to isolate the reflected pulse from the return signal and to determine a range from the device to the reflecting landmark. The reflecting landmark includes a first passive reflector, a second passive reflector, and a static structure configured to statically position the second passive reflector at an angle relative to the first passive reflector. The device optionally moves in a particular direction while receiving the return signal, detects a Doppler shift in the reflected pulse portion of the return signal, and determines an angle between the particular direction and a straight line between the device and the landmark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.