Semi-automatic direction finding set
US4983983A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1989 |
| Grant date | Jan 8, 1991 |
| Priority date | — |
| Expiry date | Dec 5, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S3/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A receiver selects and amplitude demodulates an RF signal from one of a pality of directional antennas. The demodulated signal is then delayed to put it in time synchronism with the same signal information from an omnidirectional antenna. A signal is then generated of the peak pulses of the demodulated signal when the pulses are in time synchronism with pulses from the omnidirectional antenna. A control indicator receives the peak pulses along with periscope bearing signals and ship's heading signals and gives an r,.THETA. display of the amplitude of the RF signal selected from the directional antenna at the periscope true bearing angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.