With overcrowding threatening the safety of Earth’s orbital environment, methods for tracking and understanding the motions of objects in orbit have become very important. This paper details an estimation algorithm that incorporates optimal control for the purposes of Maneuver Detection and Reconstruction. In this context, maneuver refers to any unmodeled acceleration: active spacecraft thrusti...

The cis-lunar periodic orbit exhibits some unique dynamic characteristics. Among them is the distant retrograde orbit, which has long-term stability and one of ideal candidate deployment orbits for space stations deep-space exploration transfer stations. Orbiting, rendezvous, docking are among flight operations involved in station on-orbit construction, material supply, spacecraft monitoring, o...

Abstract--This paper gives a complete analysis of the problem of aeroassisted return from a high Earth orbit to a low Earth orbit with plane change. A discussion of pure propulsive maneuver leads to the necessary change for improvement of the fuel consumption by inserting in the middle of the trajectory an atmospheric phase to obtain all or part of the required plane change. The variational pro...

Close circumnavigation is an important function indispensable for servicing satellites. We discuss the bielliptic yaround maneuver by impulsive thrust control for a small and low cost servicing satellite ying around a target satellite. An optimal feedback control scheme for the thrust is proposed to maintain this trajectory in the presence of disturbances. The extended Kalman lter is employed t...

In impulsive orbital maneuvers, a large disturbance torque is generated by the thrust vector misalignment from the center of mass (C.M). The purpose of this paper is to reject the mentioned disturbance and stabilize the spacecraft attitude, based on the combination of a one degree of freedom (1DoF) gimbaled-thruster, two reaction wheels (RWs) and spin-stabilization. In this paper, the disturban...

Spacecraft autonomy is becoming an important aspect of the design and operation of future space missions. While science objectives continually increase, budgets for development and operations remain fairly flat. Implementing spacecraft autonomy may help in achieving these goals, while reducing operations costs. Autonomy algorithms have been developed and tested using ground simulations, however...

The capability accurately and timely detect a resident space object (RSO) maneuver is critical task for monitoring activities. This paper presents data-driven Gaussian Binary RSO Maneuver Detection (GaBRSOMD) method to whether or not there between two tracks of the same on different orbital paths. Using an in-house simulated catalog environment, Classification (GBC) used three types maneuvers: ...

Data obtained, using a polygraphic technique, on the characteristics of the motor and genital copulatory responses of male rabbits, rats, mice, hamsters, and guinea pigs are reviewed. This methodology provided detailed information, not accessible to other analyses, on the frequency and dynamic organization of copulatory pelvic thrusting trains of the species studied. This comparative analysis s...

The use of gravels as syntectonic indicators of thrusting has recently been questioned by foreland-basin models that assign gravels to a post-thrusting interval of progradation, except in very proximal areas. On the basis of precise temporal control provided by magnetostratigraphically dated sections, the history of gravel progradation after a major thrusting and uplift event in the northwester...