Bad glide slope using sonar

Archive
1

Hi Guys,
I test the automatic landing using the sonar.
when i automatic landing without sonar, it looks great. but today, i try my new sonar for good flare. it have bad glide slope and strange behaviour.
attach is my log, wish to help.
thanks.

2

Sorry ,this is for plane. not for copter

3

@jinchengde,
I moved it for you to the ArduPlane v3.2.1 firmware sub forum.
Regards,
TCIII GM