Stephanie J. Thomas

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This paper describes several tools and technologies that have been developed for future spacecraft formation flying missions. This includes algorithms to perform autonomous navigation and control, with new results presented for trajectory planning in highly elliptic orbits and fault detection for a distributed spacecraft system. The overall approach is(More)
In recent years, formation flying has been recognized as an enabling technology for a variety of mission concepts in both the scientific and defense arenas. Examples of developing missions at NASA include magnetospheric multiscale (MMS), solar imaging radio array (SIRA), and terrestrial planet finder (TPF). For each of these missions, a multiple satellite(More)
A MATLAB-based software tool, called the Solar Sail Control Toolbox, has been developed for solar sail analysis, design and simulation. The toolbox includes functions for multi-body dynamic modeling, attitude control systems design, thrust vector control design, orbit analysis, solar sail mission analysis, thermal analysis and power subsystem analysis.(More)
As agent-based software is more extensively deployed for the control of real-time systems, it is imperative to have tools available for the monitoring and analysis of these systems. Princeton Satellite Systems' (PSS') current ObjectAgent tools enable users to easily create and initialize agents in a multiple spacecraft system. Advanced tools do not(More)
Future solar sail missions, such as NASA's Solar Polar Imager Vision, will require sails with dimensions on the order of 50-500 m. We are examining a square sail design with moving mass (trim control mass, TCM) and quadrant rotation primary actuators plus pulsed plasma thrusters (PPTs) at the mast tips for backup attitude control. Quadrant rotation is(More)
Manned spacecraft will require maintenance robots to inspect and repair components of the spacecraft that are only accessible from the outside. This paper presents a design of a novel free-flying maintenance robot (known as a MaintenanceBot.) The Maintenance-Bot uses Control Moment Gyros (CMGs) for manipulator arm and attitude control. This provides high(More)
Space debris is a rising concern for the sustained operation of our satellites. The population in space is continually growing, both gradually with a steady stream of new launches, and in sudden bursts, as evidenced with the recent collision between the Iridium and inactive COSMOS spacecraft. The problem is most severe in densely populated orbit regimes,(More)
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