Hi all,I'm just wondering how can we perform a position hold (within 10-20 cm, just like microdrone MD4-200 did ) with a GPS and IMU because I know that the accuracy of normal GPS is aroung 2m and can not achieve up to few cm level if we dont have DGPS. So I'm thinking of a Kalman fusion between GPS and IMU to give a more accuracy in position ? I'm not so clear about that, it has made me confused for a long timeThat's why I post this entry to get your inputAny idea are appriciated and welcome.I forget to post a link to you guy for easy imagination of GPS position hold.http://microdrones.com/en_mc_videos.phpthen looking for a video name "flight-performance md4-200, part 3", this is what it called "GPS positon hold"
You need kalman Filters with GPS and accelerometers, to estimate a more accurate position. Some R/C helis uses optical flow (like optical mouses) to keep position.
hi Jason, By using relationships between position vs velocity, and velocity vs acceleration, we can estimated displacement in position (dX, dY, dZ) using accelerometer input value. However the error is drift over time, it should be use in shorterm period. Hope my explanation makes sense
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