PROJECT TITLE :
Effects of Nonuniform Surface Errors Along the Radius on Reflector’s Radiation Characteristic and Its Quality Evaluation
Based on the works of Yahya Rahmat-Samii, a multiobjective optimization model is developed to investigate the effects of surface errors’ nonuniformity along the radius on the reflector’s radiation characteristic. Through the optimization model, Pareto front for trading off the height gain loss (PGL) and the primary sidelobe level increase (SLLI) is obtained. Simulations clearly show that for the identical root mean square (rms) error for the full reflector, different distributions along the radius end in totally different PGLs and first SLLIs. Then, the weighting function of the rms errors is considered and the evaluation formula of PGL is successfully applied to nonuniform errors. It is concluded that besides the radius, the amplitude aperture distribution, and also the ratio of focal length to diameter (F/D), errors’ nonuniformity is also an vital issue that should be thought of in the procedure of the quality evaluation of the reflector surface.
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