Sidelobe Sector Nulling with Minimized Phase Perturbations.
Abstract
A new phase-only pattern synthesis method has been developed to lower the sidelobes of a given antenna pattern in a wide sector, while reducing pattern distortion elsewhere. The method consists of finding the phase perturbations that minimize a performance measure defined to be a weight sum of the average sector sidelobe power and the sum of squared weight perturbations. By varying the weights in the performance measure assigned to the sidelobe sector power and the weight perturbations, it is possible to shift the relative emphasis placed on the two objectives of reduced sidelobe power and small pattern distortion. The phase perturbations are obtained numerically using a nonlinear computer optimization code, since the equations obtained by equating to zero the partial derivatives are nonlinear and cannot be solved analytically. Curves are plotted showing the variation of the average sector sidelobe power, sum of the squared weight perturbations, gain in the look direction, and pattern null locations, with the ratio of the weights in the performance measure. Examples are shown of the patterns with reduced sidelobes that are obtained using this method. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1985
- Accession Number
- ADA157058
Entities
People
- D. A. Pierre
- R. A. Shore
Organizations
- Rome Laboratory