Analyze Redundant Sensor Values: PX4 Pixhawk 2

🧪 Flight Testing & Log Analysis
1

Hey,

I am looking at post-flight logs, specifically IMU data, and want to see how similar the redundant IMU readouts are. However, after using the ulog2csv script, I am only seeing one IMU readout (MPU9250) in the sensor combined csv. Is there any way for me to find a log of what the other redundant sensors were reading during a flight?

Thanks,

Paul

2

Hi Paul,

Try to set this param to 6 which enables sensor comparison logging:
https://dev.px4.io/v1.9.0/en/advanced/parameter_reference.html#SDLOG_PROFILE

1 Like
3

Hey Julian,

Will changing that param only allow me to do sensor comparisons after running a test? I was hoping I would be able to compare the triple redundant IMU data after parsing the .ulg file.?

4

Looking at the code it looks like that should be possible. @bkueng could you comment?

5

I don’t understand. You need to change the parameter, since by default, only the used IMU’s data is logged. Then you need to do another flight.

6

Yep, the parameter worked. My original hope would be to compare IMU data on past tests. However, I see this is not possible since I did not have the parameter set for that.

Thank you for the help.

Paul