Degradation in Performance of Adaptive Null-Steering Antennas
NAVAL RESEARCH LAB WASHINGTON DC
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This report quantifies the degradation in the overall main beam gain performance capability of any phased array antenna which necessarily accompanies the formation of pattern nulls in a number of directions. The adaptive formation of pattern nulls constitutes one strategy through which a radar may seek to suppress effects of stand-off jammers. However, an array comprising a finite number of elementary radiators disposes of only a finite number of degrees of freedom. Thus it has long enough been recognized as the number of nulls required approaches the number of degrees of freedom, antenna performance deteriorates. Here, this fact is given a simple quantitative formulation very much in accord with our intuitive expectation.
- Active and Passive Radar Detection and Equipment