加速度计 Accelerometer
You will need to calibrate your accelerometer on first use or if the flight controller orientation is changed. Otherwise you should not need to recalibrate (except perhaps in winter, if you have a flight controller that was not thermally calibrated in the factory).
Poor accelerometer calibration is generally caught by preflight checks and arming-denied messages (QGC warnings typically refer to "high accelerometer bias" and "consistency check failures").
按照 QGC地面站 的指引，将机体翻转到一系列的位置并静置（需要翻转到下一个位置时，QGC会有提示）。
这个步骤与 罗盘校准 类似，不同的只是在每个方向将机体静置（而非旋转）。
The calibration uses a least squares 'fit' algorithm that doesn't reaquire you to have "perfect" 90 degree orientations. Provided each axis is pointed mostly up and down at some time in the calibration sequence, and the vehicle is held stationary, the precise orientation doesn't matter.
执行校准
校准步骤如下：
- 打开 QGroundControl 并连接上飞机。
- 在工具栏选择 齿轮 图标（机体设置），然后在侧边栏选择 传感器。
点击 加速度计 传感器按钮。
你必须首先设置好 自动驾驶仪方向。 如果没有，也可以在这里设置。
点击确定开始校准。
按照屏幕上的图示引导，将机体翻转到指定位置。 看到 (图示位置变成黄色) 的提示，握紧机体并保持静止。 该位置标定完成后，屏幕上的相应图示将变成绿色。
在机体的所有方向上重复校准步骤。
Once you've calibrated the vehicle in all the positions QGroundControl will display Calibration complete (all orientation images will be displayed in green and the progress bar will fill completely). You can then proceed to the next sensor.