Apparatus for the observation and indentification of helicopters

Details Apparatus for the observation and indentification of helicopters Apparatus for the observation and indentification of helicopters

1992-10-08

1994-09-13

Sotomayor, John B.

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

With particular circuit

Spectrum analysis

342196, 342 90, G01S 1350, G01S 7292

Patent

active

053472829

ABSTRACT:
Apparatus for the observation and identification of helicopters by means of an FM-CW radar apparatus provided with transmitter means (1), antenna means (2) and receiver means (3). Blade flashes caused by the rotor blades are digitized by A/D converter (4) and processed by Fourier analysis means (5) and processor (6) in order to determine the range from a helicopter to the radar apparatus and the rotor symmetry characteristics. These symmetry characteristics, together with the blade flash repetition frequency yield a substantially unambiguous indication of the helicopter type.

REFERENCES:
patent: 4275396 (1981-06-01), Jacomini
patent: 4389647 (1983-06-01), Fanuele et al.
patent: 4490718 (1984-12-01), Opitz et al.
patent: 4670753 (1987-06-01), Vacanti
patent: 5070335 (1991-12-01), Lewis et al.
patent: 5081459 (1992-01-01), Guillerot et al.
patent: 5124710 (1992-06-01), Debuisser

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