Which parameter should i change

1

The speed of the plane looked like a sudden change when I tested it. I should change that parameter to change the situation

2

2019-05-08%2010-26-52%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE
2019-05-08%2010-26-52%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE1032×432 33.2 KB

3

I can see that the plane went into Descend mode but I can’t tell why from just this graph. You would have to share a log on https://logs.px4.io for us to have a look.

4

https://logs.px4.io/plot_app?log=9308a8fe-6cc9-4dbd-b8b0-75491bf1544a

5

OK，I have changed EKF2_GPS_V_NOISE to 1.5.It no longer prompts “no local position” and " no global position ".I don’t know if that’s the best thing to do