Still placed upward, z axis x, y, z is the raw data into acceleration, gravity acceleration take 980 cm/s ^ 2, and the error of the z axis is 20, gx, gy, gz acceleration is obtained and the horizontal plane Angle, error within 2 degrees, if after the removal of acceleration of gravity, no matter what device location, static acceleration according to the formula should be 0, but the actual is main with the acceleration of gravity in the same direction of the axis error is too big, the other two axis error is reasonable, don't know why, not zero acceleration resting, points out the speed of increasing or decreasing, does not conform to the requirements, don't know how to solve, how to offset the resting after the acceleration of gravity acceleration of 0 or within a reasonable error?

CodePudding user response:

You won't be want to use this to calculate speed?
Generally is used to calculate the Angle, detect shaking, determine that would prevent a direction, used to calculate velocity error will be large, and in theory to calculate the velocity error accumulates by acceleration, over time error can be considerable

Reference

if after the removal of acceleration of gravity, no matter what device location, static acceleration according to the formula should be 0

Removal of gravitational acceleration equal to clear operation, not minus 9.8, but minus the level in stationary value,
Some required before unmanned aerial vehicle (uav) in horizontal alignment is also because of this, reset to reduce the actual values don't go to the theoretical value

CodePudding user response:

Realize now with acceleration velocity and displacement measurement is really difficult to achieve, the search on the net, many are separated from moving object speed measuring sensor, doesn't fit, please module tied to the object to measure on the velocity or displacement of the module should be used?

CodePudding user response:

refer to the second floor weixin_42767374 response:

now realized with acceleration velocity and displacement measurement is really difficult to achieve, the search on the net, many are separated from moving object speed sensors, are not suitable for, is the module to object to measure on the velocity or displacement of the module should be used?

Using GPS, navigation is done with this for current speed

CodePudding user response:

Please get the original value and the conversion formula between the actual acceleration is how to get?