SwePub - sökning: WFRF:(Chamboredon Guillaume)

Numrering	Referens	Omslagsbild	Hitta
1.	Shoemaker, M. A., et al. (författare) Design and validation of a trajectory estimation system for the Hayabusa sample return capsule 2010 Ingår i: Spaceflight Mechanics 2010, Pts I-III. - : Univelt, Inc. - 9780877035602 ; , s. 375-394 Konferensbidrag (refereegranskat)abstract The Japanese Hayabusa spacecraft will return to Earth in summer, 2010, carrying samples from asteroid Itokawa. Because the sample return capsule will reenter the atmosphere at night, the capsule and surrounding air will appear as a bright light (i.e., "fireball") during the portion of the trajectory with high aerodynamic heating. Kyushu University, in collaboration with the Japan Aerospace Exploration Agency, is developing a ground-based optical sensor system to observe the reentry and estimate the vehicle's trajectory. This paper describes the design and validation currently underway for the proposed system, in preparation for operations in mid-2010. An Extended Kalman Filter (EKF) is used to estimate the capsule's position and velocity, as well as a scale factor on the atmospheric density. Simulations of the EKF show that the capsule's state at the end of the visible portion of the trajectory (i.e., at approximately 25 km altitude) can be estimated with a 1-s uncertainty of 60 m in position and 8 m/s in velocity.

Shoemaker, M. A., et al. (författare)
Design and validation of a trajectory estimation system for the Hayabusa sample return capsule
2010
Ingår i: Spaceflight Mechanics 2010, Pts I-III. - : Univelt, Inc. - 9780877035602 ; , s. 375-394
Konferensbidrag (refereegranskat)abstract
- The Japanese Hayabusa spacecraft will return to Earth in summer, 2010, carrying samples from asteroid Itokawa. Because the sample return capsule will reenter the atmosphere at night, the capsule and surrounding air will appear as a bright light (i.e., "fireball") during the portion of the trajectory with high aerodynamic heating. Kyushu University, in collaboration with the Japan Aerospace Exploration Agency, is developing a ground-based optical sensor system to observe the reentry and estimate the vehicle's trajectory. This paper describes the design and validation currently underway for the proposed system, in preparation for operations in mid-2010. An Extended Kalman Filter (EKF) is used to estimate the capsule's position and velocity, as well as a scale factor on the atmospheric density. Simulations of the EKF show that the capsule's state at the end of the visible portion of the trajectory (i.e., at approximately 25 km altitude) can be estimated with a 1-s uncertainty of 60 m in position and 8 m/s in velocity.

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