Yaw Rate Chart

Any discussion on using LapTimer. Please use this forum in case you need guidance on how to use LapTimer or perform a certain operation
20 or more Posts ★★★
20 or more Posts ★★★
Posts: 40
Joined: Mon Jul 03, 2017 8:32 pm
Has thanked: 2 times

Re: Yaw Rate Chart

Postby Mateusz » Wed Feb 14, 2018 11:35 am

Thanks for this. I have set the acceleration data at 60Hz, but on your advice I will up it to 100Hz.
I was more concerned about validity of the acceleration readings once you start moving mostly sideways on the track.

20 or more Posts ★★★
20 or more Posts ★★★
Posts: 818
Joined: Thu May 03, 2012 5:26 am
Location: Kingsport, TN USA
Has thanked: 11 times
Been thanked: 30 times

Re: Yaw Rate Chart

Postby gplracerx » Wed Feb 14, 2018 3:37 pm

The readings will still be valid for the vehicle frame of reference. But at high yaw angles, they won't look the same as values calculated from GPS data in the Earth frame, assuming your GPS antenna is reasonably close to the center of mass of your car. In theory you could calculate the yaw angle from the angle needed to rotationally transform the accelerometer data to match the GPS data. The problem is that you really need the rotation rate data as well as the accelerometer data from the IMU in the phone to do the job right. Even better would be magnetometer data as well so you know the orientation of the vehicle in the Earth frame of reference. Comparing that to the GPS direction gives you the yaw angle directly. Maybe someday.

Return to “Using LapTimer”

Who is online

Users browsing this forum: No registered users and 3 guests