Re: [Paparazzi-devel] Umarim IMU Issue

[Refik Sever]

Hi,

Before I saw the Iman's email, I was unaware of this issue. Our plane had a lot of crashes at the beginning  because ahrs got confused after a big turn or a loop. Today I turned the plane on the ground and saw that the PFD shows totally different after a loop.  

I added these two lines which is described in the issue and now it behaves normally.

I think that it will be good to add something about this issue on the umarim page of wiki to inform beginners.

Regards,

Refik

"Martinmm:

The issue was that AHRS_PROPAGATE_FREQUENCY was not set in the Umarim airplane example configs and defaulted to 60Hz that made it "sort of usable" in normal flying but killed it with a roll or looping. The config files should contain at least

  <configure name="AHRS_PROPAGATE_FREQUENCY" value="50"/>
  <configure name="AHRS_CORRECT_FREQUENCY" value="50"/>
"

From:	Iman
Subject:	Re: [Paparazzi-devel] Umarim IMU Issue
Date:	Sat, 24 Aug 2013 18:51:14 -0700 (PDT)

---

Hello I have a problem with my Umarim_lite_v2 : there is a large delay in reaction of IMU to movements. I'm reading this <https://github.com/paparazzi/paparazzi/issues/366> discussion but I want to know that is there any way for fixing this problem? I'm using Umarim default airframe file on Paparazzi V5