2,162,150 research outputs found
Demokratik Sol Parti seçim bildirgesi : DSP ile dürüst yönetim, hakça düzen, ulusal birlik
No full textDemokratik Sol Parti seçim bildirgesi
No full text1987: Daha çok üreten halkça bir düzen -- 1991: Gözünaydın Türkiye -- 1995: DSP ile dürüst yönetim, hakça düzen, ulusal birlik -- 1999: Dürüst yönetim, hakça düzen, ulusal birlik, inançlara saygılı laiklik -- 2002: Sessiz devrim : DSP'nin ülke sorunlarına yaklaşımları ve çözüm önerileri
Letter to Reverend H.A. Moon from F.D. Moon regarding a recommendation of Reverend Watson
No full textLetter from F.D. Moon recommending Reverend Watson for appearance in front of the First Baptist Church in Guthrie
Letter to Dr. E.C. Moon from F.D. Moon regarding a teaching certificate and physician job.
No full textLetter to E.C. Moon regarding a visit to Oklahoma and possible jobs for he and his wife Vivian
Joe Moon
No full text"Sgt (Joe Blue)Moon VP 6893 VX121493 1/54 ASSL Coy HQ McMillians Harpes folly Nov40 August 43".Sgt (Joe Blue) Moon. VP 6893 VX121493. 1/54 Anti Aircraft Search Light, Company Headquarters, Macmillans. Harpes folly. November 40 August 43
Navigating to the Moon along low-energy transfers
No full textThis paper presents a navigation strategy to fly to the Moon along a Weak Stability Boundary transfer trajectory. A particular strategy is devised to ensure capture into an uncontrolled relatively stable orbit at the Moon. Both uncertainty in the orbit determination process and in the control of the thrust vector are included in the navigation analysis. The orbit determination process is based on the definition of an optimal filtering technique that is able to meet accuracy requirements at an acceptable computational cost. Three sequential filtering techniques are analysed: an extended Kalman filter, an unscented Kalman filter and a Kalman filter based on high order expansions. The analysis shows that only the unscented Kalman filter meets the accuracy requirements at an acceptable computational cost. This paper demonstrates lunar weak capture for all trajectories within a capture corridor defined by all the trajectories in the neighbourhood of the nominal one, in state space. A minimum Delta v strategy is presented to extend the lifetime of the spacecraft around the Moon. The orbit determination and navigation strategies are applied to the case of the European Student Moon Orbiter
Orbit determination and control for the European Student Moon Orbiter
No full textThis paper presents the preliminary navigation and orbit determination analyses for the European Student Moon Orbiter. The severe constraint on the total mission Delta nu and the all-day piggy-back launch requirement imposed by the limited available budget, led to the choice of using a low-energy transfer, more specifically a Weak Stability Boundary one, with a capture into an elliptic orbit around the Moon. A particular navigation strategy was devised to ensure capture and fulfil the requirement for the uncontrolled orbit stability at the Moon. This paper presents a simulation of the orbit determination process, based on an extended Kalman filter, and the navigation strategy applied to the baseline transfer of the 2011-2012 window. The navigation strategy optimally allocates multiple Trajectory Correction Manoeuvres to target a so-called capture corridor. The capture corridor is defined, at each point along the transfer, by back-propagating the set of perturbed states at the Moon that provides an acceptable lifetime of the lunar orbit. (C) 2012 Elsevier Ltd. All rights reserved
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