PROCESS AND DEVICE FOR PASSIVE DETECTION OF AIRCRAFT, NAMELY HELICOPTERS
Assignee
ETAT FRANCAIS AS REPRESENTED BY DELEGUE GENERAL POUR L'ARMEMENT
Filed
Mar 14, 1985
Granted
Jan 12, 1988
Location
PARIS FR
Abstract
A process and device for passive detection of helicopters includes detection of helicopter noise and ambient noise by means of an electro-acoustic transducer, and outputting of an amplitude modulated signal therefrom; amplitude demodulation of the signal in the frequency band between 300 Hz and 3500 Hz; spectral analysis of the demodulated signal; and selection and registration of characteristic frequency lines reflective of the rotary units of the helicopter. The process and device permit passive detection of helicopters in the lower noise, higher frequency band, thereby also permitting utilization of smaller antenna arrays.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Mar 31, 1986
Rescinded
Apr 15, 1987
Duration
1 year
Inventor
- 1MICHEL B. ANDRIEU
Record Details
- Patent number
- US 4719606
- Application
- 06741301
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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