lsm6ds3加速度计理论精度

下午好，
我试图确定用lsm6ds3加速度计计算的角度的理论精度。根据规格，我看到有许多不准确/噪音的来源。噪声密度由范围和采样频率决定，由温度和零点精度引起的零点变化。其中，零点精度被列为+/- 40mg的常数值。没有提及可用于更好地改变该值的任何因素（例如，降低范围会降低噪声密度）。
当我们确定角度时，我们使用两个读数的arctan。对于45度最坏情况，这意味着我们将得到x = 0.707g和y = 0.707g的理论测量值。如果我假设最差情况零点精度仅在这两个值（+/- 40mg），一个正值和一个负值，我得到x = 0.747和y = 0.667。这给了我一个41.76度的计算角度，这是-3.24度的误差。对于我的申请，这是不可接受的。
我是否正确地假设我们可以在生产后校准零件的零点精度？我们能够准确地获得毫克的零值吗？
在此先感谢您的帮助。



以下为原文




Good afternoon,
I am trying to determine the theoretical accuracy of an angle calculated with the lsm6ds3 accelerometer.  From the spec I see there are a number of sources of inaccuracy/noise.  There is noise density that is dictated by range and sampling frequency, zero point change due to temperature and zero point accuracy.  Of these, zero point accuracy is listed as a constant value of +/- 40mg.  There is no mention of any factors that can be used to change this value for the better (e.g. lowering the range reduces the noise density).
When we determine the angle we use the arctan of two of the readings.  For the 45-degree worst case that means we would get a theoretical measurement of x = 0.707g and y = 0.707g.  If I assume worst case zero point accuracy only on both of these values (+/- 40mg), one positive and one negative, I get x = 0.747 and y = 0.667.  That gives me a calculated angle of 41.76 degrees which is an error of -3.24 degrees.  For my application this is unacceptable.
Am I correct to assume that we can calibrate the zero point accuracy out of the part after production?  How accurate should we be able to get the zero value in mg?
Thanks in advance for your help.