NEARFIELD ADAPTIVE ARRAY MEASUREMENTS

Award Information
Agency:
Department of Defense
Amount:
$55,565.00
Program:
SBIR
Contract:
N/A
Solitcitation Year:
N/A
Solicitation Number:
N/A
Branch:
Air Force
Award Year:
1988
Phase:
Phase I
Agency Tracking Number:
9089
Solicitation Topic Code:
N/A
Small Business Information
Sensis Corp
The Marketplace - Rt 92, Manlius, NY, 13104
Hubzone Owned:
N
Woman Owned:
N
Socially and Economically Disadvantaged:
N
Duns:
N/A
Principal Investigator
 ROBERT W SCHARSTEIN
 (315) 682-7777
Business Contact
Phone: () -
Research Institution
N/A
Abstract
IN ORDER TO DETERMINE THE FAR-FIELD PROPERTIES OF AN ADAPTIVE ARRAY ANTENNA SEVERAL NEAR-FIELD MEASUREMENT TECHNIQUES TOGETHER WITH AN ANALYTICAL MAPPING OR EXTRAPOLATION ARE PROPOSED AND ANALYZED WITH RESPECT TO ACCURACY AND ANECHOIC CHAMBER IMPLEMENTATION LOGISTICS. STEADY STATE PERFORMANCE INCLUDING GEOMETRY SENSITIVITY AND RADIATION PATTERN EFFECTS SUCH AS NULL DEPTH, NULL WIDTH, SIDELOBE LEVEL, AND MAIN BEAM DEGRADATION AS WELL AS THE TRANSIENT ADAPTATION TIME OF THE ADAPTIVE ALGORITHM ARE MEASURED. THE PROPOSED DESIGN AND ANALYSISADDRESSES FULLY ADAPTIVE ARRAYS AND PARTIALLY ADAPTIVE SYSTEMS OF SIDELOBE CANCELLERS. THE NEAR-FIELD ELECTROMAGNETIC INTERACTION BETWEEN THE SIGNAL SOURCE, WIDE-BAND JAMMER SOURCES, AND TEST ARRAY IS EXACTLY AMENABLE TO A LINEAR MATHEMATICAL MODEL. THE CROSS-CORRELATION BETWEEN ELMENTS IS CALCULATED USING A COMBINATION OF INTEGRAL TRANSFORMS AND RANDOM SIGNAL METHODS, TOGETHER WITH CLASSICAL ELECTROMAGNETIC MODELS SUCH AS THE PLANE WAVE SPECTRUM TO REPRESENT THE NEAR FIELDS. HOWEVER, THE ADAPTIVE PROCESSOR COMPONENT OF THE ADAPTIVE ARRAY SYSTEM IS TYPICALLY NON-LINEAR, WHICH IMPLIES THAT THE ANALYTICAL MAPPING FOR NEAR-FIELD TO FAR-FIELD PERFORMANCE IS GENERALLY SYSTEM DEPENDENT.

* information listed above is at the time of submission.

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