DocumentCode :
2795500
Title :
Radar ground-clutter shields
Author :
Ruze, J. ; Sheftman, F.I. ; Cahlander, D.A.
Author_Institution :
Massachusetts Institute of Technology, Lexington, MA, USA
Volume :
3
fYear :
1965
fDate :
23955
Firstpage :
294
Lastpage :
300
Abstract :
Metal shields (or fences) are used to reduce the ground clutter received by a radar. The design of a clutter shield for an L-band radar employing a 60-foot parabolic reflector with Cassegrain geometry is verified by scale-model measurements at 
-band. It is shown that a 100-foot fence at a distance of 500 feet from the radar will give a nominal one-way clutter reduction of 20 db. More than 10 db additional clutter reduction was achieved by cutting rectangular slots in the top edge of the fence. However, these and other periodic structures are subject to "resonances" related to grating lobes, as was shown experimentally and theoretically by the principle of stationary phase. A proposed nonperiodic edge treatment is expected to be free of this troublesome effect.
-band. It is shown that a 100-foot fence at a distance of 500 feet from the radar will give a nominal one-way clutter reduction of 20 db. More than 10 db additional clutter reduction was achieved by cutting rectangular slots in the top edge of the fence. However, these and other periodic structures are subject to "resonances" related to grating lobes, as was shown experimentally and theoretically by the principle of stationary phase. A proposed nonperiodic edge treatment is expected to be free of this troublesome effect.Keywords :
Feeds; Fresnel reflection; Gratings; Laboratories; Optical diffraction; Periodic structures; Radar clutter; Radar measurements; Radar tracking; Resonance;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Antennas and Propagation Society International Symposium, 1965
Type :
conf
DOI :
10.1109/APS.1965.1150287
Filename :
1150287
Link To Document :
