한국마린엔지니어링학회:학술대회논문집 (Proceedings of the Korean Society of Marine Engineers Conference)
- 한국마린엔지니어링학회 2001년도 추계학술대회 논문집(Proceeding of the KOSME 2001 Autumn Annual Meeting)
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- Pages.130-134
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- 2001
추정을 이용한 재진입 궤적의 정상상태 오차감소
Reduction of Steady-State Error Using Estimation for Re-Entry Trajectory
초록
In the re-entry control system, errors apt to induce because the time derivative of drag acceleration is analytically estimated. Still more, the difficulty of estimation of the exact drag coefficient in hypersonic velocity and the nun-reality of the scale height cause a steady-state drag error. This paper proposes the additional method of the disturbance observer. This reduces the steady-state drag error according to the following series. First, this method estimates a error in drag acceleration time derivative by the analytic calculation and then creates the new drag acceleration time derivative using the estimated error. The performance of the re-entry control system is verified about 32 reference trajectories.