This paper describes a technique to estimate surface-based duct parameters by using a simple ray tracing/correlation method.The approach is novel in that it incorporates the Spearman rank-order correlation scheme betw...This paper describes a technique to estimate surface-based duct parameters by using a simple ray tracing/correlation method.The approach is novel in that it incorporates the Spearman rank-order correlation scheme between the observed surface clutter and the surface ray density for a given propagation path.The simulation results and the real data results both demonstrate the ability of this method to estimate surface-based duct parameters.Compared with the results obtained by a modified genetic algorithm combined with the parabolic wave equation,the results retrieved from the ray tracing/correlation scheme show a minor reduction in accuracy but a great improvement on computation time.Therefore the ray tracing/correlation method might be used as a precursor to more sophisticated and slower techniques,such as genetic algorithm and particle filters,by narrowing the parameter search space and providing a comprehensive and more efficient estimation algorithm.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 40775025)
文摘This paper describes a technique to estimate surface-based duct parameters by using a simple ray tracing/correlation method.The approach is novel in that it incorporates the Spearman rank-order correlation scheme between the observed surface clutter and the surface ray density for a given propagation path.The simulation results and the real data results both demonstrate the ability of this method to estimate surface-based duct parameters.Compared with the results obtained by a modified genetic algorithm combined with the parabolic wave equation,the results retrieved from the ray tracing/correlation scheme show a minor reduction in accuracy but a great improvement on computation time.Therefore the ray tracing/correlation method might be used as a precursor to more sophisticated and slower techniques,such as genetic algorithm and particle filters,by narrowing the parameter search space and providing a comprehensive and more efficient estimation algorithm.