AnsweredAssumed Answered

attitude under shake condition in hand

Question asked by 印新吕 on Oct 29, 2015
Latest reply on Oct 30, 2015 by Mike Stanley

Hello!

I have tested the sensor fusion library 4.2 and 5.0 all. My  sensor is ADIS16445,a 6-axis with gyro + acc. I have tuned  parameters according to my sensor noise in fusion.h.

 

1.Bu all this two libraries don't performance well in continuous shaking condition in hand.For example ,i shake sensors in a flat desk continuously,the pitch and roll will increase slowly.

I have used some AHRS products like Xsens-MTI300 or SBG-IG500,they all performance well in shaking condition in hand,their pitch and roll don't increase ,but only  a little oscillation according to the shake.I have tried many methods,like low pass filtering the accelerometers,but can't performance well. I don't know how can they do this?

2.When computing the incremental fast (typically 200Hz) rotation vector rvec (deg),i tried to not minus the gyro bias,this seems performance well.I think  the algorithm can't estimate the gyro bias accurately under  maneuvering,so the inaccuracy estimated bias will cause the attitude error.I average the gyro datas in 3-5 sec,and use this as the inital bias to be deducted.

3.the linear acceleration time constant,linear acceleration decay factor ! How should I set this parameter??  What is the meaning of this parameter?

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