问题描述
现在iOS 4不再是NDA，我想知道Gyroscope为开发人员提供的加速度计。 API有区别吗？其他的东西？
Now that iOS 4 is no longer NDA, I would like to know what Gyroscope has to offer over the Accelerometer for developers. Is there a difference in APIs? Other things?
推荐答案
MEMs陀螺仪是一种变化率设备。当设备在其任何轴上旋转时，您可以看到旋转的变化。加速度计仅提供沿X，Y和Z向量的力，并且不能解决扭曲。通过使用两个传感器，您通常可以实现所谓的6DOF（自由度）惯性系统 - 或航位推算 - 允许您查找设备的相对物理位置。 （请注意，所有惯性系统都会漂移，因此长期不稳定）。
A MEMs gyroscope is a rate of change device. As the device rotates in any its axis, you can see a change in rotation. An accelerometer only provides the force along the X,Y,and Z vectors, and cannot solve for "twist". By using both sensors, you can often implement what is referred to as a 6DOF (degrees of freedom) inertial system - or dead reckoning - allowing you to find the relative physical location of the device. (Note that all inertial systems drift, so its not stable in the long term).
简而言之：陀螺仪测量旋转，加速度计测量平移。
In short: gyroscopes measure rotation, accelerometers measure translation.
有。
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