Zero EKF wind speeds in copter?

@lzl200102109 wrote:

Hi everyone,

I am trying to obtain the EKF wind speed estimates in datalog from a new 3DR IRIS+. However, they are all zeros currently when I visualize the variables under EKF2/VWN and EKF2/VWE. Here is a shared link to a log file:

https://drive.google.com/file/d/0B87ph6kxwZzpd3Y5eEh1eDhtcTA/view?usp=sharing

Anybody know what the problem is? I tried to update the firmware from v3.2.1 to v3.3.3, the same problem persists. Do I need an airspeed sensor to obtain valid wind speed readings?

Thank you!

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