False Alarm Reduction Method for Formation Flying Spacecraft FDI

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Lim, Jun Kyu; Park, Chan Gook
Issue Date
IAC 2009
The main focus of this paper is to propose a method for reducing a false alarm of formation flying spacecraft. In
this paper, we construct a federated UKF to estimate navigation information and use threshold method for
spacecraft fault detection and isolation. Also, we apply an extended scalar adaptive filter for preventing the false
alarm as a pre-filtering method. An extended scalar filter is an adequate filtering method for eliminating
abnormal jumping signal by estimating three different kinds of variances continuously. The measurement noise
variance is estimated by using an innovation method while, the velocity error and the acceleration error variance
are estimated through a least square method. This filter operates as a pre-filter of the local filter in the federated
UKF. When the sensor output exceeds threshold limit due to sudden noise, we eliminate abnormal measurements.
Simulation results show that the extended scalar adaptive filter can eliminate sudden abnormal measurements.
Thus, the extended scalar adaptive filter is an adequate algorithm for reducing the false alarm.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Mechanical Aerospace Engineering (기계항공공학부)Others_기계항공공학부
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