I'm currently learning the Visual SLAM. But I'm also very curious about the modern filter-based SLAM. Can someone share with me some modern review papers about it?
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$\begingroup$ All modern based filter SLAMs are based on the MSCKF. Probably the best open source version of it is OpenVins. It has a ton of documentation on the derivations, and other stuff. Probably the best paper reviewing all the parts of the MSCKF is Mingyang Li's PhD thesis $\endgroup$ – edwinem Jun 29 '20 at 14:42