AMODS: Autonomous mobile on-orbit diagnostic system

Researchers at the United States Naval Academy are developing an Autonomous Mobile On-orbit Diagnostic System (AMODS) which utilizes CubeSats to perform on-orbit inspections on conventional spacecraft. AMODS comprises a multiple CubeSat arrangement wherein one self-propelled transport CubeSat (BRICSat) will deliver one of several “repair” CubeSats (RSats) with manipulable arms to spacecraft for the purpose of providing diagnostic and maintenance services designed to repair or extend the life of that craft. AMODS will be validated in three phases. Phase One commenced in May 2015 with the launch of the transport module (BRICSat-P) where the effectiveness of microcathode thrusters to provide appropriate Δν was evaluated. A second transport module (BRICSat-D), which will use data from BRICSat-P to improve thruster control and demonstrate proximity operation maneuvers using the propulsion system, will launch in September 2016. Phase Two involves the 2017 launch of the prototype repair unit, RSat-P, to test the effectiveness of the robotic manipulators, and Phase Three comprises the 2018 launch of the first fully operational Space Tug, BRICSat-T and three repair modules, RSat-1,2,3 to fully validate core functionality and on-orbit feasibility. This paper provides an overview of the entire mission. It commences with an analysis of the design of the BRICSat transfer vehicle and the results of the BRICSat-P flight experiment. The paper will introduce the process and strategic details which guide the development and integration of the transport and repair units to optimize tendering and deployment functions. It will also include a summary of the RSat design, its visual, assessment and repair proficiencies and the requirements for actuations in a space environment. Finally, it will address the methods of validating the entire AMODS system on-orbit.