Grishko

pp. 48-64

pp. 14-26

pp. 52-66

pp. 72-82

This article describes cost estimations of summary characteristic velocity (SCV) required for replenishment of satellite systems at circular and near-circular orbits. TSCV costs optimization for maneuvering is based on using a parking orbit. All possible combinations of values of initial and final orbit parameters were investigated sequentially. The accompanying effects were analyzed; consideration of these effects allows to minimize SCV costs significantly. Analytical relations which determine a number of passive circuits at a parking orbit representing a compromise between time and SCV costs for coplanar flights were found. The obtained results could be used for minimization of temporal and energetic costs while designing and exploiting specified types of satellite systems. In addition, these results are applicable in exploitation of maneuvering space vehicles designed for collecting large-sized space debris.

Problems of condition monitoring of agricultural fields based on prediction of NDVI dynamics considering climate and atmospheric influence were studied. Different algorithms for preparing initial data were proposed. The research was conducted for the regions of Russia which are notable for different relief, climate and environment. Initial data for simulation were formed by combining the information from the multi-spectral and hyper-spectral space imagery. The conducted mathematical simulation showed a principal opportunity to use Earth observing systems for appropriate short-time predicting of vegetation processes.

The article describes the problems of efficient analysis of the telemetry data coming from spacecraft. The necessity of spacecraft on-board parameters constant monitoring over a period of circuit is justified. The main difficulties of received data processing are illustrated, some variants of solutions are given. The statistic observation results of “Yubileiny (RS-30)” satellite during the 2008-2011 years, made by Bauman university Mission control center, are demonstrated. The conclusions about present-day condition of the satellite are brought forward to.