Research/Patents/US 5376940
US 5376940Tier 1 — UAP Program Assignee

HELICOPTER RECOGNITION RADAR PROCESSOR

Assignee

Hughes Aircraft

Filed as: HUGHES AIRCRAFT COMPANY

Filed

Dec 19, 1985

Granted

Dec 27, 1994

Location

El Segundo CA (Aerospace Corp/TRW)

Abstract

A radar processor is disclosed for processing the radar return samples from a Doppler radar receiver to discriminate helicopter targets from fixed-wing targets. The samples are passed through a helicopter filter which eliminates the target skin Doppler return, and passed the sidebands about the target skin return which are due to the helicopter rotor hub modulation. The coefficients of the helicopter filter are selected to maximize the signal-to-noise ratio. The radar processor requires only a few milliseconds on target for reliable detection and can, therefore, be easily implemented by scanning surveillance systems.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Apr 11, 1986

Rescinded

Apr 15, 1994

Duration

8 years

Inventor

  • 1THEAGENIS J. ABATZOGLOU

Sensitive facility: El Segundo CA (Aerospace Corp/TRW)

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Back to patent indexSource: USPTO 35 USC §181 secrecy order records