{"action":"created","issue":{"url":"https://api.github.com/repos/Tudat/tudat/issues/34","repository_url":"https://api.github.com/repos/Tudat/tudat","labels_url":"https://api.github.com/repos/Tudat/tudat/issues/34/labels{/name}","comments_url":"https://api.github.com/repos/Tudat/tudat/issues/34/comments","events_url":"https://api.github.com/repos/Tudat/tudat/issues/34/events","html_url":"https://github.com/Tudat/tudat/issues/34","id":155486133,"number":34,"title":"Orbit Determination Code","user":{"login":"DominicDirkx","id":5039068,"avatar_url":"https://avatars.githubusercontent.com/u/5039068?v=3","gravatar_id":"","url":"https://api.github.com/users/DominicDirkx","html_url":"https://github.com/DominicDirkx","followers_url":"https://api.github.com/users/DominicDirkx/followers","following_url":"https://api.github.com/users/DominicDirkx/following{/other_user}","gists_url":"https://api.github.com/users/DominicDirkx/gists{/gist_id}","starred_url":"https://api.github.com/users/DominicDirkx/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/DominicDirkx/subscriptions","organizations_url":"https://api.github.com/users/DominicDirkx/orgs","repos_url":"https://api.github.com/users/DominicDirkx/repos","events_url":"https://api.github.com/users/DominicDirkx/events{/privacy}","received_events_url":"https://api.github.com/users/DominicDirkx/received_events","type":"User","site_admin":false},"labels":[{"id":378406533,"url":"https://api.github.com/repos/Tudat/tudat/labels/Upcoming%20Feature","name":"Upcoming Feature","color":"f9d0c4","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2016-05-18T12:13:44Z","updated_at":"2016-11-08T12:24:09Z","closed_at":null,"body":"Based on the extensive development in my own personal Tudat branch (not all on Github), the Tudat code base will be expanded with orbit determination functionality, including the associated propagation of variational equations, observation models, least squares adjustment, observation corrections, observation partials, etc. This represents a significant extension of Tudat and will be handled in stages. Current progress can be seen in the OrbitDetermination branch of my personal Tudat fork  [](https://github.com/DominicDirkx/tudat/tree/OrbitDetermination)\n"},"comment":{"url":"https://api.github.com/repos/Tudat/tudat/issues/comments/259123272","html_url":"https://github.com/Tudat/tudat/issues/34#issuecomment-259123272","issue_url":"https://api.github.com/repos/Tudat/tudat/issues/34","id":259123272,"user":{"login":"DominicDirkx","id":5039068,"avatar_url":"https://avatars.githubusercontent.com/u/5039068?v=3","gravatar_id":"","url":"https://api.github.com/users/DominicDirkx","html_url":"https://github.com/DominicDirkx","followers_url":"https://api.github.com/users/DominicDirkx/followers","following_url":"https://api.github.com/users/DominicDirkx/following{/other_user}","gists_url":"https://api.github.com/users/DominicDirkx/gists{/gist_id}","starred_url":"https://api.github.com/users/DominicDirkx/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/DominicDirkx/subscriptions","organizations_url":"https://api.github.com/users/DominicDirkx/orgs","repos_url":"https://api.github.com/users/DominicDirkx/repos","events_url":"https://api.github.com/users/DominicDirkx/events{/privacy}","received_events_url":"https://api.github.com/users/DominicDirkx/received_events","type":"User","site_admin":false},"created_at":"2016-11-08T12:24:09Z","updated_at":"2016-11-08T12:24:09Z","body":"A quick update on this extensive feature:\r\n\r\nThe propagation of the variational equations has now been implemented, with analytical partial derivatives for most types of accelerations implemented. \r\n\r\nProgress is currently ongoing on extending the suite of observation models and associated partials. The code is mostly ready (including unit tests), but is missing comments in many places (https://github.com/DominicDirkx/tudat/tree/ObservationPartials)\r\n\r\nA pull request has been opened for new code that can be used to define ground stations.\r\n\r\nThe next step is to include an automatic routine to perform least-squares estimation, after which we will have a first iteration of functional orbit determination in Tudat!"}}
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