Introduction: The National Radio Astronomy Observatory's Green Bank facility has several antennas available for spacecraft communications, Doppler tracking and radar, and provides unparalleled support infrastructure for data processing and recording equipment. The 100 meter Robert C. Byrd Green Bank Telescope (GBT) is currently capable of receiving signals at frequencies from 300 MHz to 86 GHz ...

A recently developed technique for reconstructing approximately two-dimensional (∂/∂z≈0), timestationary magnetic field structures in space is applied to two magnetopause traversals on the dawnside flank by the four Cluster spacecraft, when the spacecraft separation was about 2000 km. The method consists of solving the GradShafranov equation for magnetohydrostatic structures, using plasma and m...

The research presented in this report focuses on the spacecraft simulators, Whorl-I and Whorl-II, in the Space Systems Simulation Laboratory (SSSL) at Virginia Tech. The goal of this research is to develop a program to visualize the attitude of the simulators in real-time through Analytical Graphics Inc.’s Systems Tool Kit (STK). Spacecraft missions are high-risk and highexpense; therefore, ext...

A, B, C = state-space matrices a = acceleration due to linear-quadratic-regulatorand artificial-potential-field-determined control effort aAPF = acceleration due to artificial-potential-fielddetermined control effort aLQR = acceleration due to linear-quadratic-regulatordetermined control effort am = maximum acceleration aobs = acceleration of chaser spacecraft toward an obstacle ax;y;z = accele...

Abstract. Shock loads are very high amplitude and short duration transient loads. They produced in space structures by pyrotechnic devices placed the launchers initiating stage or fairing separations. While spacecraft structure is not susceptible to this range of frequencies, electrical units could be seriously damaged during launch phase. tests performed on verify if they withstand loads, thus...

Passive radiative cooling is currently the frontier technology in renewable-energy research. In terms of extraterrestrial applications, a critical component to thermal management system spacecraft, where extreme environment space can cause large temperature variations that break and damage equipment. For terrestrial nocturnal or daytime expected lead cost-effective passive heat without need ine...

This paper describes a prototype of software system of neural network control of telemetry data for malfunction diagnosis of spacecraft subsystems. The prototype is used for testing of intelligent technologies for processing information about a spacecraft subsystems state, prediction and detection of irregularities of the spacecraft subsystem modes. The Information obtained from on-board data s...