Pulse doppler radar systems for helicopter recognition

Details Pulse doppler radar systems for helicopter recognition Pulse doppler radar systems for helicopter recognition

1990-11-08

1991-12-03

Barron, Jr., Gilberto

Communications: directive radio wave systems and devices (e.g.,

Return signal controls radar system

Receiver

342192, G01S 1350, G01S 1388

Patent

active

050703358

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.

REFERENCES:
patent: 4275396 (1981-06-01), Jacomini
patent: 4348674 (1982-09-01), Muth et al.
patent: 4389647 (1983-06-01), Fanvele et al.
patent: 4641138 (1987-02-01), Opitz

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