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Encke-Beta Predictor for Orion Bum Targeting and Guidance.

【摘要】 The state vector prediction algorithm selected for Orion on-board targeting and guidance is known as the Encke-Beta method. Encke-Beta uses a universal anomaly (beta) as the independent variable, valid for circular, elliptical, parabolic, and hyperbolic orbits. The variable, related to the change in eccentric anomaly, results in integration steps that cover smaller arcs of the trajectory at or near perigee, when velocity is higher. Some burns in the EM-1 and EM-2 mission plans are much longer than burns executed with the Apollo and Space Shuttle vehicles. Burn length, as well as hyperbolic trajectories, has driven the use of the Encke-Beta numerical predictor by the predictor/corrector guidance algorithm in place of legacy analytic thrust and gravity integrals.

【作者】 Robinson, S.; Scarritt, S.; Goodman, J. L.;

【作者单位】 National Aeronautics and Space Administration, Houston, TX. Lyndon B. Johnson Space Center.;

【年(卷),期】2016(),

【年度】2016

【页码】1-25

【总页数】25

【原文格式】PDF

【正文语种】eng

【中图分类】T;

【关键词】Encke method;Predictions;Space exploration;Burning time;Trajectories;Orbit determination;State vectors;Mathematical models;Algorithms;Elliptical orbits;Space shuttles;Nasa space programs;Independent variables;Anomalies;Orbital mechanics;Integral transformations;Hyperbolic trajectories;Parabolic flight;Eccentric orbits;Circular orbits;

【原文服务方】国家工程技术数字图书馆

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