最近好像好在几个论坛都看到有人讨论加速度传感器测位移的方法,但几乎没看到有成功应用的,在Freescale的一个座谈会看到如下说法:
[ 问题 25 ] | a. 由加速度值积分求速度、位移,累计误差如何考虑,大致范围多大,有无试验结果?
b. 飞思卡尔提供的加速度传感器频响特性如何?频带宽度? | [ 答案 25 ] | Our sensor is able to measure acceleration within good accuracy +/-7.5%. But to integrate with time, errors will accumulate and one needs to like at the initial raw data and determine what is needed before processing. So the answer depends on how accurate have you capture the raw data and it would be expected that the user knows what is going on with the exact movement of the sensor. Unfortunately, we do not have analysis done for position with respect to accuracy because this is highly dependent on the degree of data capturing and algorthim used. |
这么看来,可靠性和精度似乎都无法保证。
不知这边有没有人正在进行相关研究,指点指点,我目前考虑用加速度传感器测垂直位移,因为拿到的是数字接口的加速度传感器,只能用软件积分,不过还在考虑可行性。 |
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