Antenna and method for two-dimensional angle-of-arrival determination
US6104346A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1999 |
| Grant date | Aug 15, 2000 |
| Priority date | — |
| Expiry date | Jan 6, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S3/46
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An antenna and system for determining two-dimensional angle-of-arrival includes circular array interferometers for azimuth, linear interferometers for elevation, and a mast for positioning the interferometers in a vertically stacked orientation. The circular array interferometers exhibit azimuth constant-phase-difference contours orthogonal to elevation constant-phase-difference contours exhibited by the linear interferometers. An antenna and system for determining azimuth of input signals includes ambiguous and non-ambiguous circular array interferometers. The non-ambiguous circular array interferometer resolves ambiguities introduced by the ambiguous circular array interferometer, the at least one ambiguous circular array interferometer operatively coupled to a low-order Butler matrix and power divider/combiner such that a high order Butler matrix is not required to generate omnidirectional phase modes from the ambiguous circular array interferometer. A method for determining phase differences indicative of two-dimensional angle-of-arrival includes determining a first phase difference indicating azimuth using circular array interferometers, determining a second phase difference i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.