its been a long time, from drone development and also from electronics and blogging, let it go, tonight it is ardupilot time, I have seen some algorithms working like get position and velocity from accelerometer data but haven't found anything yet. so was surfing through the code and found that AP_InertialNavEKF.h library is just fallback library for the ardupilot to switch between ekf and normal mode. a comment from first line /* A wrapper around the AP_InertialNav class which uses the NavEKF filter if available, and falls back to the AP_InertialNav filter when EKF is not available */ /** now working on how can I implement on my own drone since my plans are different from ardupilot. so here i am now sleepless nights and go on until I finally make my quadcopter (the only incomplement project left).
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