ChaoqinRobotics/LINS---LiDAR-inertial-SLAM

qusetion of F matrix

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KalmanFilter.hpp:157
Ft.block<3, 3>(GlobalState::vel_, GlobalState::gra_) = M3D::Identity();

the value of vel w.r.t gra in in pape is 0, why here is Identity?
the value of att w.r.t gra in in pape is -M3D::Identity(), why here is 0?