Electromagnetic detection apparatus
US4305074A · kind A · utility
18Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 12, 1980 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | May 12, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnetic detection apparatus for sensing an object, has a transter for radiating electromagnetic energy toward the object. The apparatus also has an array of at least three spaced receiving antennas and one parasitic antenna. The parasitic antenna is spaced from and mounted alongside the array. Also included is a phase detection circuit for measuring the phase difference between signals received by one of the receiving antennas with respect to the other two. This apparatus can sense phase difference and correlate it to the azimuthal position of the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.