integrating the true acceleration will not give the true location

[o-antill]

Hi there,
I believe i am missing something and i am hoping someone can explain my issue. Currently as part of a project i will be integrating acceleration to manually find location, in the final scenario the acceleration will have custom noise added to it. However, figured to check my integration methods i would initially test it by using purely the true acceleration obtained using 'vehicle.get_acceleration()' which from my understanding gives the global acceleration of the vehicle. But when i plot the error between my calculated location and the i get errors of up to half a meter and the error appears very systematic. It should be noted i am running Carla with a fixed time step and in synchronous mode.

The screenshot shows where the vehicle travels as well as the error.
Any help would be greatly appreciated thank you.

[o-antill]

I understand that integrating will eventually cause errors but i would not expect this behavior