问题描述
现在 iOS 4 不再是 NDA，我想知道 Gyroscope 必须为开发者提供什么而不是加速计.API 有区别吗?其他的?
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 陀螺仪是一种速率变化设备.当设备沿其任意轴旋转时，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，无法求解扭曲".通过使用这两个传感器，您通常可以实现所谓的 6DOF(自由度)惯性系统 - 或航位推算 - 允许您找到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.
有一个 用于读取陀螺仪的新 API.
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