Method of optical-geometrical modeling in a problem of definition of the dimensional and reflective characteristics of spacecraft

 

V. R. Akhmetianov, I. O. Lutov, M. I. Oleinikov

A.F.Mozhaisky Military-space academy

 

The paper is received on April 16, 2015

 

Abstract. In the article the method of optical-geometrical modeling in a problem of definition of the dimensional and reflective characteristics of spacecraft is considered. After ending term of fissile existence spacecraft passes in the category of space debris and requires continuous check, including ground-level optical-electronic means. The optical-geometrical model includes the geometrical description of spacecraft as three-dimensional body composed from functional - constructive elements (FCE), and optical characteristics of materials and covers FCE. For a number of spacecraft there are source specific data representing digital photographic images, which one are presented by the developers at a stage of assembly and test operations. The relative geometrical performances of spacecraft can be received from analysis of the digital image. With this purpose it is offered to use the compact alphabet of the geometrical description of the contour pattern of a construction of spacecraft by the way collections of primitives mapped on the source image with allowance for of properties of a central projection of object of supervising on a picture plain. The received estimations of geometrical arguments of spacecraft allow to realize analysis of his reflective characteristics with the help of a mathematical model of numerically - analytical account in a visible band, which one is based on submission of spacecraft by the way of set of geometrical primitives of conical, spherical and flat types. As the pattern of reflex of a surface the pattern of reflex of a Lambert - Fong, exhibiting by a reflected surface radiating in a given direction and spectral range by the way sums two independent a components having diffuse and reflecting nature of reflex is accepted. The approach, offered in the article, is illustrated on an example of the image of spacecraft «Hubble Space telescope», received in 2009 during space experiment «Atlantis» STS-125.

Keywords: a spacecraft, space debris, optical-electronic means, geometrical characteristics, optical characteristics of materials and covers.