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.