Communications: directive radio wave systems and devices (e.g. – Clutter elimination
Patent
1983-08-04
1989-02-14
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Clutter elimination
342203, 455311, 328167, G01S 728, H03H 712
Patent
active
048049620
ABSTRACT:
A radar receiver having a clutter-elimination filter in the receiver's intermediate frequency stage. The filter is centered on the intermediate frequency f.sub.i and has a transfer function in which a band-pass characteristic is superimposed on a band-rejection characteristic. The band-pass response has a principal lobe substantially conforming to the function (sin x)/x with x=(w-w.sub.i).pi.T. The band-rejection response presents an attenuation zone centered about f.sub.i ; this zone is wide enough to suppress much of the response from clutter but narrow enough to avoid suppressing much of the energy in the echo from the target. For example, the width of the attenuation zone may be from about f.sub.i -0.2/T to about f.sub.i +0.2/T. The filter provides a maximum response on each side of the attenuation zone, spaced from f.sub.i by about 0.4/T Hz in each direction. Outside the maxima, the response is dominated by the band-pass characteristic and achieves transmission minima at about 1/T Hz above and below f.sub.i. Examples are given of filters providing such transfer functions.
REFERENCES:
patent: 2196881 (1940-04-01), Wheeler
patent: 2878379 (1959-03-01), Parker et al.
patent: 3389349 (1968-06-01), Troost et al.
patent: 3585538 (1971-06-01), Lindsey
patent: 3744015 (1973-07-01), Marimon et al.
patent: 4290066 (1981-09-01), Butler
patent: 4453145 (1984-06-01), Schuster
J. L. Lawson, G. E. Uhlenbach, "Threshold Signals", Radiation Lab Series, 1950, pp. 297-302.
H. Urkowitz, "Filters for Detection of Small Radar Signals in Clutter", Journal of Applied Physics, vol. 24, #8, 8/53, pp. 1024-1031.
A. W. Rihaczek, "Target Detection in Clutter", Principals of High-Resolution Radar, 1969, pp. 350-365.
Barron, Jr Gilberto
Diamond Devices, Inc.
Tarcza Thomas H.
LandOfFree
Clutter elimination radar does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Clutter elimination radar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clutter elimination radar will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1369083