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논문 기본 정보

자료유형
학술저널
저자정보
Sooho Park (Jump Trading) Han-Lim Choi (한국과학기술원) Nicholas Roy (Massachusetts Institute of Technology) Jonathan P. How (Massachusetts Institute of Technology)
저널정보
한국항공우주학회 International Journal of Aeronautical and Space Sciences International Journal of Aeronautical and Space Sciences Volume.11 Number.4
발행연도
2010.12
수록면
326 - 337 (12page)

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초록· 키워드

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This work addresses problems regarding trajectory planning for unmanned aerial vehicle sensors. Such sensors are used for taking measurements of large nonlinear systems. The sensor investigations presented here entails methods for improving estimations and predictions of large nonlinear systems. Thoroughly understanding the global system state typically requires probabilistic state estimation. Thus, in order to meet this requirement, the goal is to find trajectories such that the measurements along each trajectory minimize the expected error of the predicted state of the system. The considerable nonlinearity of the dynamics governing these systems necessitates the use of computationally costly Monte-Carlo estimation techniques, which are needed to update the state distribution over time. This computational burden renders planning to be infeasible since the search process must calculate the covariance of the posterior state estimate for each candidate path. To resolve this challenge, this work proposes to replace the computationally intensive numerical prediction process with an approximate covariance dynamics model learned using a nonlinear time-series regression. The use of autoregressive time-series featuring a regularized least squares algorithm facilitates the learning of accurate and efficient parametric models. The learned covariance dynamics are demonstrated to outperform other approximation strategies, such as linearization and partial ensemble propagation, when used for trajectory optimization, in terms of accuracy and speed, with examples of simplified weather forecasting.

목차

Abstract
1. Introduction
2. System Models and Forecasting
3. Informative Path Planning
4. Covariance Dynamics Learning
5. Numerical Experiments
6. Conclusions
Acknowledgments
References

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