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Research of Scattering Characteristics and Recognition Method for Satellite Targets

Author: ZhangSen
Tutor: DengWeiBo
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: Target scattering characteristics RCS Method of Moments Physical Optics Fuzzy classification
CLC: V474
Type: Master's thesis
Year: 2008
Downloads: 75
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Abstract

With the rapid development of space technology, the world of space resources increasingly dependent on how effectively the satellite electromagnetic scattering characteristics or RCS values ??and its classification for the maintenance of national security and the promotion of human spaceflight activities are of great significance . This article first complex electromagnetic scattering characteristics and spatial object recognition techniques were reviewed in detail; followed by a detailed analysis of the principles of MoM and PO law and procedures, and proposed combination with FEMAP 3DMax software quickly build complex object model methods, and ultimately the use of FEMAP This paper studies the software to build a sophisticated model of the satellite, as its scattering properties and identification method basis. Secondly, this paper analyzes in detail the structural characteristics of the target satellite and high frequency scattering properties, and method used in this paper with the most accurate PO MoM conducted feasibility verification; followed by an analysis of the model meshing relationship between density and accuracy to determine a suitable mesh size paper satellite power density, saving computation time and memory; In the above analysis on the basis of established using FEMAP RCS satellite models were estimated, a detailed analysis of the target RCS satellite With the attitude angle and frequency of changes in the law, the fine structure of the surface of the satellite and solar panels for satellites overall impact of the RCS to do a more detailed analysis; then presents a method based on PO large targets for ultra-efficient algorithm that this method can at very high frequencies under the conditions of simple shapes target RCS estimates, and can get a better estimate of the results. Finally, the paper presents a spin-stabilized satellites for size estimation method, which is equivalent to the satellite is a reasonable target ellipsoid, on this basis, the use of the target sequence estimation RCS target size of major and minor axes The simulation results show that this method can effectively estimate target size equivalent major and minor axes; Then give a target for the three-axis stabilized satellite fuzzy classification method, which first satellite for amendment of the RCS sequence Direct Mellin transform (MDMT), then extract the target RCS sequence, MDMT sequences mean and standard deviation and MDMT sequence itself as a five effective statistical characteristics, composition feature vector, and then use the fuzzy classification methods to identify satellite targets. In this paper, five class Object RCS satellite sequences were estimated simulation results show that the algorithm in the case of low signal to noise ratio can achieve good results, but more stable.

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