Radio direction finding system
US4551727A · kind A · utility
Inventor
Key dates
| Filing date | Dec 23, 1982 |
| Grant date | Nov 5, 1985 |
| Priority date | — |
| Expiry date | Dec 23, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S3/046
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A radio direction finding system based on the doppler frequency shift principle is disclosed which utilizes a polygonal shaped antenna array and a conventional FM receiver. Voltages from each antenna are combined in an rf summing circuit which may be located remotely from the antenna. Audio output from the FM receiver is processed to measure the phase angle of the commutation frequency phase modulation imparted to the rf receiver input signal by gain variations within the rf summer circuit. Bearing angle proportional to the measured phase angle is displayed in a circular array of light emitting diodes and a three digit decimal display and is provided for recording or remote display through a serial interface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.