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학술지 A Blind Calibration Scheme Exploiting Mutual Calibration Relationships for a Dense Mobile Sensor Network
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이병탁, 손승철, 강경란
IEEE Sensors Journal, v.14 no.5, pp.1518-1526
14ZC2200, 지역광부품 고도화를 위한 광융합 기술개발, 이병탁
In sensor-based measurement systems, the sensor calibrations are crucial to obtain the correct measured values. In this paper, we propose a new blind calibration scheme for a massive mobile sensor network. The mutual calibration relationships between colocated sensors are utilized in a densely deployed sensor network. We model the calibration relationships in a linear algebraic model, and derive an equivalent Laplacian matrix. By just solving the Laplacian linear equation, we can determine how much each sensor has to be calibrated. The proposed calibration scheme is explained as a generalized extension of the simple mean model scheme to the mobile sensor network. Theoretical analysis and simulation results show that the proposed linear algebraic model improves the accuracy of the simple mean model by nearly ?? 2 ?? 2noise times at maximum, in terms of mean square error, where usually ?긣g?긪oise. In addition, we show the feasibility of our scheme on human movements, by applying the scheme to the Levy-walk model in the simulation. The most important advantages of our scheme are that the calibration model is straightforward and that the solution is simply obtained with a matrix inversion. © 2001-2012 IEEE.
KSP 제안 키워드
Algebraic model, Analysis and simulation, Calibration model, Human movement, Laplacian Matrix, Linear equations, Matrix Inversion, Mobile Sensor Network, Model scheme, Theoretical Analysis, blind calibration