When Drone With SF11 Fly Away the Building

@RizHuang wrote:

I use SF11 for altitude hold , There is a problem that when the drone fly away the building , the measure height of rangefinder suddenly go high . and when the drone fly in the building , the height go down . That cause the acture height of the drone suddenly change . Just as the pic show .

QQ截图20170727182048.png965x629 45.3 KB

And the log show that

QQ截图20170727182037.png1907x445 17.5 KB

Here my question is why the first three the height of the drone did not change , and then suddenly change, is there any method to avoid the suddenly change height ?

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