Gyro Sensor drift and Correct angle Estimation

Question

I am using LG Optimus 2x smartphone(Gyroscope and Accelerometer sensor) for positioning.

I want to get correct rotation angles from gyroscope that can be used late

Answer 1

Basically gyros drift over long time periods. Whereas accelerometers have no drift but tend to be unstable. By combining information from both sensors using a Kalman filter you can obtain a accurate attitude. For some this less complex you could also use a Complementary Filter.

See this post for more info: Combine Gyroscope and Accelerometer Data