Pulse doppler radar systems for helicopter recognition
US5070335A · kind A · utility
8Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1990 |
| Grant date | Dec 3, 1991 |
| Priority date | — |
| Expiry date | Nov 8, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/5246
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pulse doppler radar system for helicopter recognition has a receiver (5) for receiving reflected pulse radar signals. A distinguishing circuit (22) is provided for distinguishing a group of received frequencies within a predetermined spectral range and for ignoring at least the largest amplitude frequency within that group. A threshold detector (24) is arranged to determine when the amplitude of the remaining frequencies in the group exceed a predetermined value to provide a recognition signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.