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The Electromagnetic Propagation Models and Duct Parameters Inversion Algorithm Research of Marine Atmospheric Duct

Author: MengShuSheng
Tutor: WangJian
School: Ocean University of China
Course: Condensed Matter Physics
Keywords: Ducting Trapping effect Particle Swarm Optimization
CLC: TN011
Type: Master's thesis
Year: 2010
Downloads: 138
Quote: 1
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Abstract


Oceanic and Atmospheric waveguide has a strong spatial and temporal distribution, according to Patterson, the probability of occurrence of the surface of the waveguide in the worldwide average of about 15%, and the different regions vary greatly, and the the evaporated steam waveguide probability of occurrence than the surface of the waveguide higher. Ducting sea battlefield spatial and temporal distribution of parameters, significantly improve the actual performance of the ship-borne radar remote detection, enhance the long-range strike capabilities of ships, Naval Operational Decision of great significance. The conventional means of monitoring is difficult continuous access to a wide range of atmospheric duct parameters. Radar sea clutter refractivity parameters inversion atmospheric waveguide parameters rapid development in recent years, a new technology, the use of the technology by the sea clutter power information in real time, continuous diagnosis of the current sea ducting. If there can be further anti performance the atmospheric waveguide height, strength, thickness, and other parameters, and these parameters with the distribution of the radar range. First, the article describes the type and condition of the atmospheric refraction causes of Oceanic and Atmospheric waveguide and classification of ducting on radar wave propagation. Next, we introduced the theory of electromagnetic wave propagation in three models: the use of ray tracing technology simulation standard atmospheric environment and electromagnetic propagation loss in evaporation duct environment, pointing out that the simulation process is basically can determine the trajectory of propagation of electromagnetic waves, initially identified in The marine atmosphere forged whether there will be the waveguide propagation and the emergence of location. The principle of the parabolic equation, and explores its initial field and boundary conditions, and step-by-step Fourier transform method gives the numerical solution of the parabolic equation. Oceanic and Atmospheric environment electromagnetic propagation loss model, and use of the calculation of the electromagnetic wave one-way propagation loss with distance and height. Waveguide mode theory, pointing out the advantages and disadvantages of the waveguide mode theory. Finally, we discussed Oceanic and Atmospheric waveguide parameters inversion method, particle swarm optimization algorithm flowchart; ducting model introduced five parameters, and the 1350 orientation of the radar images discrete the clutter power data with the use of parabolic equation model The theoretical calculations of sea clutter is constructed objective function, the sea clutter data and radiosonde data collected under test, combined with particle swarm optimization algorithm inversion of the five parameters of the waveguide parameters of the waveguide model. As an important part of ducting, the evaporation duct is unique in the marine atmosphere form a waveguide. Evaporation duct height the evaporation duct one of the important parameter is the important physical quantities to characterize the waveguide strength, but also to determine the evaporation duct an important parameter of the impact of electronic equipment. Inversion of the evaporation duct height of 13.4m, and the height of the theory to 12.5m relative error of 7.2% can be seen that the inversion results and the actual value of the agreement, that reflects the coastal party atmosphere on the surface of refractive index profile with a high degree of change case. The analysis shows that: because many, such as the selection of the test site, inshore nonlinear non-uniformity factors impact of these errors. I believe that by strengthening the ship-based test, collecting test data, be sure to get a very satisfactory result. In summary, the use of particle swarm optimization algorithm refractivity parameters to prove the scientific and feasibility of the algorithm, the inversion of a wide range of atmospheric duct parameters detection equipment is further developed to adapt to a variety of radar can provide algorithm basis.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > General issues > Basic theory > Radio wave propagation,the propagation mechanism
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