Gyros for BLDC Position Control

Hi, I am working on high precision position control with BLDC motors on my master thesis.
I am trying to control the position with an encoder on the TI-C200 processors and It's ok for now. The control accuracy is 0.1 degree on the encoder but for my thesis, I need more precise control. I have decided to do this with high precision gyros but I am a little bit confused about this issue.
I need the control the position at least 200 micro radian accuracy, hence I need to get feedback at least 200 micro radians from the sensor but I am not sure that how can I choose the proper gyro for my application?
In the gyro datasheets, there is nothing about the accuracy values. How can I choose the proper gyro for my application?
Thank you for your help!