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Shuttle orbiter Ku-band radar/communications system design evaluation: High gain antenna/widebeam hornThe physical characteristics of the high gain antenna reflector and feed elements are described. Deficiencies in the sum feed are discussed, and lack of atmospheric venting is posed as a potential problem area. The measured RF performance of the high gain antenna is examined and the high sidelobe levels measured are related to the physical characteristics of the antenna. An examination of the attributes of the feed which might be influenced by temperature extremes shows that the antenna should be insensitive to temperature variations. Because the feed support bipod structure is considered a significant contributor to the high sidelobe levels measured in the azimuth plane, pod relocation, material changes, and shaping are suggested as improvements. Alternate feed designs are presented to further improve system performance. The widebeam horn and potential temperature effects due to the polarizer are discussed as well as in the effects of linear polarization on TDRS acquisition, and the effects of circular polarization on radar sidelobe avoidance. The radar detection probability is analyzed as a function of scan overlap and target range.
Document ID
19800002035
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Iwasaki, R. (Axiomatix Los Angeles, CA, United States)
Dodds, J. G. (Axiomatix Los Angeles, CA, United States)
Broad, P. (Axiomatix Los Angeles, CA, United States)
Date Acquired
September 4, 2013
Publication Date
August 31, 1979
Subject Category
Space Transportation
Report/Patent Number
NASA-CR-160316
R7908-5
Accession Number
80N10275
Funding Number(s)
CONTRACT_GRANT: NAS9-15795
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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