{"action":"created","issue":{"url":"https://api.github.com/repos/rodralez/NaveGo/issues/3","repository_url":"https://api.github.com/repos/rodralez/NaveGo","labels_url":"https://api.github.com/repos/rodralez/NaveGo/issues/3/labels{/name}","comments_url":"https://api.github.com/repos/rodralez/NaveGo/issues/3/comments","events_url":"https://api.github.com/repos/rodralez/NaveGo/issues/3/events","html_url":"https://github.com/rodralez/NaveGo/issues/3","id":195334424,"number":3,"title":"Strange free INS coasting error","user":{"login":"kmos","id":8403734,"avatar_url":"https://avatars.githubusercontent.com/u/8403734?v=3","gravatar_id":"","url":"https://api.github.com/users/kmos","html_url":"https://github.com/kmos","followers_url":"https://api.github.com/users/kmos/followers","following_url":"https://api.github.com/users/kmos/following{/other_user}","gists_url":"https://api.github.com/users/kmos/gists{/gist_id}","starred_url":"https://api.github.com/users/kmos/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kmos/subscriptions","organizations_url":"https://api.github.com/users/kmos/orgs","repos_url":"https://api.github.com/users/kmos/repos","events_url":"https://api.github.com/users/kmos/events{/privacy}","received_events_url":"https://api.github.com/users/kmos/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-12-13T18:42:00Z","updated_at":"2016-12-13T20:39:25Z","closed_at":null,"body":"Hi,\r\n\r\nFirstly, thank you for you work! It's a very useful toolbox and it's awesome that you deliver it under gpl. \r\n\r\nSecondly, I am trying to simulate the INS without GPS calibration to estimate how much grow the error with the reference data. As you can see in the figure, \r\n![error](https://cloud.githubusercontent.com/assets/8403734/21153364/76692c4e-c16a-11e6-938f-82d378335ad0.png)\r\nthe down component error grow up too much for a free inertial solution. \r\n\r\nif you want to reproduce it, I used the ins_gps.m function without kalman filter.\r\n\r\n\r\nThank you "},"comment":{"url":"https://api.github.com/repos/rodralez/NaveGo/issues/comments/266855098","html_url":"https://github.com/rodralez/NaveGo/issues/3#issuecomment-266855098","issue_url":"https://api.github.com/repos/rodralez/NaveGo/issues/3","id":266855098,"user":{"login":"rodralez","id":5432060,"avatar_url":"https://avatars.githubusercontent.com/u/5432060?v=3","gravatar_id":"","url":"https://api.github.com/users/rodralez","html_url":"https://github.com/rodralez","followers_url":"https://api.github.com/users/rodralez/followers","following_url":"https://api.github.com/users/rodralez/following{/other_user}","gists_url":"https://api.github.com/users/rodralez/gists{/gist_id}","starred_url":"https://api.github.com/users/rodralez/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rodralez/subscriptions","organizations_url":"https://api.github.com/users/rodralez/orgs","repos_url":"https://api.github.com/users/rodralez/repos","events_url":"https://api.github.com/users/rodralez/events{/privacy}","received_events_url":"https://api.github.com/users/rodralez/received_events","type":"User","site_admin":false},"created_at":"2016-12-13T20:39:25Z","updated_at":"2016-12-13T20:39:25Z","body":"Dear kmos,\r\n\r\nFirst of all, thank you very much for your words of encouragement!\r\n\r\nWith respect to your comment, what you are experiencing is the normal operation of an INS without any aiding sensor. The time the INS starts diverging depends on the quality of the inertial sensors. This time can be around seconds for a MEMS IMU and around hours for a navigation-grade IMU.\r\n\r\nRegards."}}
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