Communications: directive radio wave systems and devices (e.g. – With particular circuit – Spectrum analysis
Patent
1987-06-29
1989-02-07
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Spectrum analysis
342 27, G01S 1332
Patent
active
048034894
ABSTRACT:
A method and system for detecting an object hidden behind and/or under various combinations of optical and/or radar camouflage is disclosed. The radar camouflage is made from material having multiple layers of lossy dielectric and supporting fabric. The optical camouflage is made from material having no special electrical properties but is colored to blend with the supporting scenery. Both types of camouflage material are cut in a random pattern of openings or apertures. The space containing the camouflaged object and other radar-reflective objects is radiated with RF energy at a frequency swept over a predetermined band within the K band of radar frequency bands so that the incident RF waves radiate through the apertures and are re-radiated through the apertures after reflection from the object to create an identifiable scintillation in the reflected RF signal and an enhancement of its average reflectivity at certain frequencies within the predetermined band. A scintillation detection algorithm and a conventional radar thresholding algorithm are performed on the reflected RF energy after it is received and the camouflage object is determined from the objects passing criteria of the two algorithms.
REFERENCES:
patent: 3341850 (1967-09-01), Kings et al.
patent: 3500395 (1970-03-01), Foster et al.
"Phenomena of Scintillation Noise in Radar Tracking Systems"; Proc. of IRE, May 1959; pp. 855-863; J. H. Dunn et al.
"1-35 GHz Microwave Scattometer"; 1979, IEEE MT T-S, International Microwave Symposium; Orlando, Fla.; May 2, 1979; pp. 551-556.
LTV A&D Sierra Research Division
Swann Tod R.
Tarcza Thomas H.
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