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Flight Controller Data Analysis Series Tutorials -- Part 6
2845 0 2017-9-29
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Content:

1.        Flight Controller Data Analysis Series Tutorials – Exporting the Flight Controller Data and Introducing DataViewer
2.        Flight Controller Data Analysis Series Tutorials – Locating the Crash Data
3.        Flight Controller Data Analysis Series Tutorials – Introduction to Coordinate Systems
4.        Flight Controller Data Analysis Series Tutorials – Introduction to Attitude Mode and Crash Cases
5.        Flight Controller Data Analysis Series Tutorials – Stopping Motors by Conducting the Combination Stick Command (CSC)
6.        Flight Controller Data Analysis Series Tutorials – Drone Under Control Crash Cases
7.        Flight Controller Data Analysis Series Tutorials – Compass Interference Cases



6.        Flight Controller Data Analysis Series Tutorials – Drone Under Control Crash Cases

After locating the crash data, determine whether the drone is under control by checking how much the control sticks are pushed and how the drone responds to the commands before the crash.

Operate the following steps to check the cause of a drone crash:
1)        Check how much the control sticks are pushed, and pay special attention to the values before and after the crash. Small values can be neglected.
2)        Check whether the drone responds to the remote controller’s commands in a timely manner by comparing the stick output values, attitude status, and speed. If a drone is under control, it will tilt and fly towards the direction indicated by the pushed stick. Generally, if the values along the accelerometer curve for a specific axis are positive, the drone is flying in the direction corresponding to that axis.
3)        Check whether the drone is flying to the direction as required based on the drone’s yaw angle.

Figure 6.1 shows the crash data of a drone. Let’s analyze this drone crash case.


35.png

Figure 6.1


Step 1: After finding out the time when the crash occurred, check the stick output curves. It can be found that the pitch stick is pushed forwards, roll stick is pushed rightwards, throttle stick upwards and yaw stick leftward.

36.png

Figure 6.2


Step 2: From figure 6.3 & 6.4, we can tell that the drone responds to the control sticks’ commands. It tilts forwards and rightwards (the attitude data values are negative, indicating that the drone tilts forwards) while flying to the north-east (the speed values in the north and east are positive and basically equal).

37.png

Figure 6.3


38.png

Figure 6.4


Step 3: Check the yaw angle value. As shown in figure 6.4, the yaw angle value is around -33.8. So the direction is 33.8° north by west.

39.png

Figure 6.4 Drone’s Yaw Angle


40.png

Figure 6.5


Step 4: It can be concluded that after the control sticks are pushed, the drone flies forwards and rightwards then crashes with an obstacle.

2017-9-29
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