A closed-loop system for the demonstration of autonomous satellite formation flying technologies using hardware-in-the-loop has been developed. Making use of a GPS signal simulator with a dual radio frequency outlet, the system includes two GPS space receivers as well as a powerful onboard navigation processor dedicated to the GPS-based guidance, navigation, and control of a satellite formation...

The NBS Boulder Laboratory is in the process of assembling a very high accuracy time transfer system. The system includes a 6.1 meter Ku-band satellite earth station, two transportable earth stations each with a 1.8 meter dish, and commercial modems designed for two-way timing. Elements of the facilities are described in this paper. High-accuracy timing with this equipment using the two-way tim...

Multipactor has become a keylimiting factor of the final performance satellite communication systems, due to increase in power levels and/or operating frequency bands. As result, critical components these systems must meet demanding multipactor specifications which should be considered during design process. This paper describes different techniques available predict threshold for radio (RF) an...

The goal of a driving simulator is to produce an environment for a driver similar to the real driving scenario. Motion cueing algorithms are used to produce a realistic motion while respecting the workspace limitations and motion simulator boundaries. Model Predictive Control has become popular recently for motion cueing. However, in this control method, the optimization is based on a predefine...

This paper briefly presents a hardware-in-the-loop (HIL) docking simulator concept. A critical requirement for the docking simulation of the HIL simulator is that its 6-degree of freedom (DOF) robots have to mimic the dynamic response of two satellites during contact/docking. However, the closed-loop response is influenced by the time delay of the robots controller, as well as by the robots hig...

Introduction: Current Thermal cycling units fail to simulate the drinking behaviors, and oral balancing temperature. They cannot also simulate other oral conditions such as drink coloring, and chemicals like tea, coffee, carbonated and noncarbonated, citrus juices as well as alcoholic and nonalcoholic drinks and also saliva and milk itself. The main objective of this study is to introduce the d...

In spacecraft attitude control, maintaining an accurate estimate of readings is crucial. Due to aging factors sensors like gyroscopes, emerged drift or bias from the correct rate values lead decreased pointing accuracy. This paper proposes unsupervised data-driven approach in order diagnose early stage abnormal drifts sensors. Three types faults are injected satellite control simulator. The obt...