Spacecraft motion around artificial equilibrium points

Control of Spacecraft Formations Around the Libration Points Using Electric Motors with One Bit of Resolution

This paper investigates a formation control problem for two space vehicles in the vicinity of the L2 libration point of the Sun-Earth/Moon system. The objective is to accurately regulate the relative position vector between the vehicles to a desired configuration, under tight tolerances. It is shown that the formation control problem is solvable using six constant thrust electric actuators requ...

Effects Analysis of Frozen Conditions for Spacecraft Relative Motion Dynamics

The purpose of this rersearch is to analyze the effective application of particular earth orbits in dynamical modeling of relative motion problem between two spacecraft. One challenge in implementing these motions is maintaining the relations as it experiences orbital perturbations (zonal harmonics J2 and J3), most notably due to the Earth’s oblateness. Certain aspects of the orbital geometry c...

Historgram Indexing Around Interest Points

It is easy to amass a large collection of digital images. Organizations such as Nasa and National Geographic already provide a large image library to add to many other proprietary image collections which can be found on the web. These images are not readily categorized like textual documents. The task of automated searching for images based on content requires object recognition techniques and ...

Artificial Intelligence Approaches to Spacecraft Scheduling

The problem of optimal spacecraft scheduling is both important and difficult. Efficient utilization of spacecraft resources is essential, but the accompanying scheduling problems are often computationally intractable and are difficult to approximate because of the presence of numerous interacting constraints. We have applied artificial intelligence techniques to the problem of scheduling astron...

Noncompact Equilibrium Points and Applications