{"id":1564,"date":"2019-02-09T22:42:53","date_gmt":"2019-02-10T06:42:53","guid":{"rendered":"http:\/\/depts.washington.edu\/uwrainlab\/?page_id=1564"},"modified":"2019-02-09T22:42:53","modified_gmt":"2019-02-10T06:42:53","slug":"a-state-triggered-line-of-sight-constraint-for-6-dof-powered-descent-guidance-problems","status":"publish","type":"page","link":"http:\/\/depts.washington.edu\/uwrainlab\/a-state-triggered-line-of-sight-constraint-for-6-dof-powered-descent-guidance-problems\/","title":{"rendered":"A State-Triggered Line of Sight Constraint for 6-DoF Powered Descent Guidance Problems"},"content":{"rendered":"<p><strong>T. Reynolds, M. Szmuk,\u00a0D. Malyuta, M. Mesbahi, B. Acikmese, J. M. Carson<\/strong><\/p>\n<p><strong style=\"text-align: justify;\">AIAA Scitech 2019 Forum<\/strong><\/p>\n<p style=\"text-align: justify;\"><span style=\"text-align: justify;\">This paper presents the formulation of a constrained 6-degree-of-freedom (6-DoF) powered descent guidance problem. The goal of this work is to design algorithms that obtain locally optimal solutions to such problems, and that are amenable to real-time implementation. Using unit dual quaternions to parameterize the equations of motion, we devise a free final time continuous optimal control problem that is subject to state and control constraints. A novel feature of this formulation is the use of state-triggered constraints, which are constraints enforced only when a certain state-dependent criterion is met. We use these constraints to model a line of sight pointing constraint that is enforced conditionally based on the distance from the landing site. A numerical example highlights how the inclusion of this constraint alters control commands and the resulting descent trajectory.<\/span><\/p>\n<div class=\"gs_scl\"><\/div>\n<p><strong>Links:<\/strong><\/p>\n<p><a href=\"https:\/\/arc.aiaa.org\/doi\/abs\/10.2514\/6.2019-0924\"><img loading=\"lazy\" class=\"alignnone wp-image-810\" src=\"http:\/\/depts.washington.edu\/uwrainlab\/wordpress\/wp-content\/uploads\/2018\/07\/download.png\" alt=\"\" width=\"26\" height=\"26\" srcset=\"http:\/\/depts.washington.edu\/uwrainlab\/wordpress\/wp-content\/uploads\/2018\/07\/download.png 225w, http:\/\/depts.washington.edu\/uwrainlab\/wordpress\/wp-content\/uploads\/2018\/07\/download-150x150.png 150w\" sizes=\"(max-width: 26px) 100vw, 26px\" \/><\/a> \u00a0 <a href=\"https:\/\/www.researchgate.net\/profile\/Taylor_Reynolds7\/publication\/330198089_A_State-Triggered_Line_of_Sight_Constraint_for_6-DoF_Powered_Descent_Guidance_Problems\/links\/5c361b2b458515a4c718e4a6\/A-State-Triggered-Line-of-Sight-Constraint-for-6-DoF-Powered-Descent-Guidance-Problems.pdf\"><img loading=\"lazy\" class=\"alignnone wp-image-811\" src=\"http:\/\/depts.washington.edu\/uwrainlab\/wordpress\/wp-content\/uploads\/2018\/07\/image_preview.png\" alt=\"\" width=\"31\" height=\"31\" srcset=\"http:\/\/depts.washington.edu\/uwrainlab\/wordpress\/wp-content\/uploads\/2018\/07\/image_preview.png 250w, http:\/\/depts.washington.edu\/uwrainlab\/wordpress\/wp-content\/uploads\/2018\/07\/image_preview-150x150.png 150w\" sizes=\"(max-width: 31px) 100vw, 31px\" \/><\/a> \u00a0 <a href=\"https:\/\/scholar.google.com\/scholar?hl=en&amp;as_sdt=0%2C48&amp;q=A+State-Triggered+Line+of+Sight+Constraint+for+6-DoF+Powered+Descent+Guidance+Problems&amp;btnG=#d=gs_cit&amp;u=%2Fscholar%3Fq%3Dinfo%3AXKUVaYLnKHoJ%3Ascholar.google.com%2F%26output%3Dcite%26scirp%3D0%26hl%3Den\"><img loading=\"lazy\" class=\"alignnone wp-image-809\" src=\"http:\/\/depts.washington.edu\/uwrainlab\/wordpress\/wp-content\/uploads\/2018\/07\/BibTeX_logo.svg_-300x97.png\" alt=\"\" width=\"65\" height=\"21\" srcset=\"http:\/\/depts.washington.edu\/uwrainlab\/wordpress\/wp-content\/uploads\/2018\/07\/BibTeX_logo.svg_-300x97.png 300w, http:\/\/depts.washington.edu\/uwrainlab\/wordpress\/wp-content\/uploads\/2018\/07\/BibTeX_logo.svg_-768x248.png 768w, http:\/\/depts.washington.edu\/uwrainlab\/wordpress\/wp-content\/uploads\/2018\/07\/BibTeX_logo.svg_-1024x330.png 1024w, http:\/\/depts.washington.edu\/uwrainlab\/wordpress\/wp-content\/uploads\/2018\/07\/BibTeX_logo.svg_.png 1200w\" sizes=\"(max-width: 65px) 100vw, 65px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>T. Reynolds, M. Szmuk,\u00a0D. Malyuta, M. Mesbahi, B. Acikmese, J. M. Carson AIAA Scitech 2019 Forum This paper presents the formulation of a constrained 6-degree-of-freedom (6-DoF) powered descent guidance problem. The goal of this work is to design algorithms that obtain locally optimal solutions to such problems, and that are amenable to real-time implementation. Using [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"http:\/\/depts.washington.edu\/uwrainlab\/wp-json\/wp\/v2\/pages\/1564"}],"collection":[{"href":"http:\/\/depts.washington.edu\/uwrainlab\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/depts.washington.edu\/uwrainlab\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/depts.washington.edu\/uwrainlab\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/depts.washington.edu\/uwrainlab\/wp-json\/wp\/v2\/comments?post=1564"}],"version-history":[{"count":1,"href":"http:\/\/depts.washington.edu\/uwrainlab\/wp-json\/wp\/v2\/pages\/1564\/revisions"}],"predecessor-version":[{"id":1565,"href":"http:\/\/depts.washington.edu\/uwrainlab\/wp-json\/wp\/v2\/pages\/1564\/revisions\/1565"}],"wp:attachment":[{"href":"http:\/\/depts.washington.edu\/uwrainlab\/wp-json\/wp\/v2\/media?parent=1564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}