RELATIVE DYNAMICS INC — National Aeronautics and Space Administration SBIR Phase I: S16

Description

The key innovations in OTP MACSnbsp;are:Integrated data-driven control algorithms for improving performance and disturbance rejectionLow Size, Weight, Power, and Cost (SWaP-C) -nbsp;new configuration with Koester prism sensor and nanometer actuators:1 milli-arcsecond (5 nanoradian) angle sensor. Modified arrangement of Hubble Space Telescope fine guidance sensor provides much higher resolution.Nanometer precision ultra-high-vacuum compatible piezo-electric-transducer (PZT) actuators with nanometer resolution position encoder.Moving guide star testbed for large telescope image stabilization.Use sensor fusion with combined fast-steering-mirror and PZT actuators with hierarchical control loop algorithms for image stabilizationThe OTP MACS innovations described above addresses several critical gaps defined in the subtopic description:OTP MACS uses highly integrated, low-power, low-weight, radiation-hard component sensor technologies, and multifunctional components.OTP MACS uses sensor fusion with robust sensing and control algorithms.The main sources of spacecraft disturbances are mechanical vibrations, sensor, and actuator noises, as well as slew residuals. The most critical disturbance is the jitter. A key idea is to use integrated data-driven feedback control algorithms to reject the repetitive and periodic disturbances. We will use two modeling approaches. The first approach is based on the first principles modeling paradigm and COMSOL Multiphysics software. The second approach is based on data-driven modeling paradigm and system identification techniques. The performance of the used techniques will be tested on the experimental setup. In the laboratory experiment, representative disturbance spectra and stochastic models on a computer will be transferred to a moving guide star simulator. The control algorithm fuses the information from two sensors to two actuators to provide milli-arcsecond image stabilization.