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Simulation technology has been widely used in the aerospace field due to its economical and rapid nature. The simulation technology based on STKX not only inherits the professionalism and fidelity of STK (Satellite Tool Kit), but also can be seamlessly integrated into the software, which has become a key technology in the simulation research in the aerospace field. The agile satellite is a kind of satellite that can observe the ground target quickly and flexibly. It is of great significance to guarantee modern agriculture, disaster prevention and reduction, resource investigation, environmental protection and national security in China. This article takes the agile satellite ground observation imaging as the engineering background, expounds the basic principles of STKX technology, explains the engineering and technical issues such as the creation of satellites, cameras and observation targets in scene simulation, and uses Cesium to demonstrate simulation effect of ground observation imaging. It aims to provide reference for the engineering application of STKX technology.

The traditional perturbation-based stochastic finite element method has the inherent limitation of requiring small uncertainties to ensure reliable results. To overcome this limitation, this paper presents a new method that redefines the stochastic problem into some sub-domains of random variables. Then, the stochastic structural responses defined in the global domain can be explicitly reconstructed from the responses obtained in each sub-domain. In this way, the uncertainties of random variables could be relatively large to achieve the acceptable accuracy. In addition, this method is also able to deal with stochastic problems with repeated eigenvalues. Numerical examples are presented to illustrate the validity and capability of this new method by comparing the results with ones from Monte Carlo simulations. Copyright © 2009 John Wiley & Sons, Ltd.