Radiodirection finding method and apparatus using doppler effect frequency modulation
US4954835A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 15, 1988 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Nov 15, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S3/54
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Radiodirection finding method and apparatus using Doppler effect frequency modulation for measuring the bearing of a source transmitting a high frequency signal, wherein either on the reception side or on the transmission side, several antenna strands are used in pairs diametrically spaced from each other and spaced evenly apart angularly about a circumference. A first pair of diametrically spaced antenna strands are energized and then the next pair of diametrically spaced antenna strands in turn are selectively energized so as to create, at all times, a mobile fictitious antenna moving diametrically and alternately between the two diametrically opposite antenna strands of the particular pair of antenna strands considered. Different pairs of diametrically opposite antenna strands are successively energized in an angularly rotating sequence from the first pair of antenna strands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.