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PRECISE focuses on the research and development of a MEMS-based monopropellant micro Chemical Propulsion System (µCPS) for highly accurate attitude control of satellites.The availability of µCPS forms the basis for defining new mission concepts such as formation flying, advanced robotic missions and rendezvous maneuvers. These concepts require propulsion systems for precise attitude and orbit control maneuverability. Basic research will be conducted aiming at improving crucial MEMS technologies required for the propulsion system. Research and development will also focus on the efficiency and reliability of critical system components. System analysis tools will be enhanced to complement the development stages. In addition, application-oriented aspects will be addressed by two endusers who are planning a formation flying mission for which the propulsion system is crucial. Finally, the μCPS will be tested in a simulated space vacuum environment. These experiments will deliver data for the validation of the numerical models. Nomenclatureρ = density I sp = specific impulse µCPS = Micro Chemical Propulsion Systems CFD = Computational Fluid Dynamics

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This paper gives an overview on preliminary results of the project PRECISE. PRECISE focuses on the research and development of a MEMS-based monopropellant micro ChemicalPropulsion System (µCPS) for highly accurate attitude control of satellites. Space mission concepts like formation flying, advanced robotic missions and rendezvous maneuvers require propulsion systems for precise attitude and orbit control maneuverability. Within PRECISE, research is conducted aiming at improving crucial MEMS technologies required for the propulsion system. Research and development also focuses on the efficiency and reliability of critical system components. Currently, the individual components of the prototype are being manufactured and assembled. The diagnostic tools for the plume and the thrust measurements are assembled and ready to be tested. The preparations for the final hot firing tests have started. Finally, the μCPS prototype will be tested in a simulated space vacuum environment. These experiments will deliver data for the validation of the numerical models implemented in the DLR TAU CFD code. NomenclatureI sp = specific impulse µCPS = Micro Chemical Propulsion Systems AFM = Atomic Force Microscopy 1 Project Manager, AIAA member 2