A Robust Attitude Measuring System for Agile Satellites
نویسندگان
چکیده
A novel attitude measuring sensor is presented to be used on agile satellites without any angular field of view restrictions. The sensor is based on low-cost, medium resolution attitude vector measurements, obtained from geomagnetic detectors (magnetometers) and coarse sun sensors (solar cells). The vector measurements chosen, have an unrestricted field of view and a reasonably high response bandwidth as required during agile satellite manoeuvres. Lowcost solid state angular rate sensors with moderate to high drift bias are used to propagate the attitude between vector measurements. All sensor outputs are validated by a pre-filtering process to eliminate spurious or faulty sensors, before feeding the data into an extended Kalman filter (EKF). The EKF is used to estimate the attitude quaternion and angular rate sensor (gyroscope) bias vectors. Practical results from a rotating platform is presented to verify the theoretical and simulation performance. This new sensor has direct application in satellite attitude estimation owing to it’s robust and good performance.
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