Research On Composite Scattering Characteristics Of Near Sea And Ship Target Based On Spark

The research on composite scattering characteristics of ship targets in near sea background is widely used in military and civilian fields,and has far-reaching significance.Based on the theory of electromagnetic scattering in random media,the geometrical characteristics of the near sea surface and its electromagnetic scattering characteristics are simulated.On this basis,the computational dilemma of coupling scattering between sea surface and target is broken.The composite scattering characteristics are simulated by using the shooting and bouncing ray method(SBR),and combined with the Spark distributed system,the echo characteristics of large-scale target in the actual near sea environment are carried out.Simulation provides theoretical basis and technical support for the development of new system radar,target detection,tracking and identification.The paper works as follows:1.In the traditional JONSWAP sea spectrum model,a shoaling factor is introduced to measure the influence of water depth variables on sea surface fluctuations,and the Monte Carlo method(Monte Carlo)is used to simulate the established near sea geometric model,the influence of water depth,wind speed,wind zone and wind direction angle on the geometric characteristics of the model is analyzed.Using 3DS MAX and FEKO software to accurately model different ship targets,and based on the reverse engineering and Boolean operations in Rhinoceros software,the ship composite model in near sea background is constructed.2.Based on the accurate establishment of near sea and ship composite models,an optimized SBR method is proposed to calculate the radar cross section(RCS)of complex scenes.Firstly,by modifying the dielectric parameters of the target panel to consider the influence of different media,and calculating the electromagnetic flow on the surface of the panel by modified equivalent current approximation method(MECA),the application range of the PO method is expanded.Secondly,the neighborhood k-d tree,back tracking techniques are used to improve the efficiency and accuracy of ray tracing and occlusion judgment in the GO method.In addition,multi-threaded concurrent computing is applied to achieve accelerated optimization on program engineering.Finally,the improved SBR method is used to calculate the composite electromagnetic scattering of ship targets in the near sea background,and its regular characteristics are statistically analyzed.3.Set up a Spark distributed system,discretize the near sea model and the electric large-size ship target model.Correct and migrate SBR to Spark cluster,calculate the composite scattering of ship targets above the sea surface in parallel,overcome the limitations of traditional methods in solving complex scattering problems of large size targets in the marine environment,such as low computational efficiency and large memory requirements,achieve accurate and fast electromagnetic simulation.