A predictor-corrector algorithm for the numerical evaluation of reflector antenna radiation integrals

The authors demonstrate that the CA (Crabtree algorithm) yields a significant saving on the number of integrand evaluations as compared to the efficient LA (Ludwig algorithm). They also present a predictor-corrector technique for using the CA without having to handle the integrand phase separately. An important advantage of using a predictor-corrector algorithm is the fact that, by comparing the predicted and corrected integrand values, it is possible to perform a self-check of the integration algorithm accuracy and hence determine when its results are reliable. The combination CA plus predictor-corrector then yields a very general, accurate, and numerically efficient technique for evaluating reflector antenna radiation integrals. The effectiveness of the CA, combined with the predictor-corrector scheme, is investigated by applying it to a reflector antenna physical-optics scattering computation example.<>