Angle random walk vs rate random walk

1. What is angle random walk?
2. How do you find the angle of a random walk?
3. What causes angular random walk?
4. What do rate gyros detect?

What is angle random walk?

Angle Random Walk (ARW) is the noise component perturbing the output of Fiber Optic Gyro (FOG). Allan Variance method is adopted to identify the ARW of particular FOG before and after thermal-inertial calibration. The reduction in ARW from 28% to 60% is observed experimentally.

How do you find the angle of a random walk?

At 1 sec the value of the square-root of the AllanVariance is 15 deg/hr. This leads to a value of the Angular Random Walk (ARW) of 15/60 deg/sqrt(hr) = 0.25 deg/sqrt(hr) = 0.0042 deg/s/sqrt(Hz) = 15 deg/hr/sqrt(Hz) [white gyro noise assumed].

What causes angular random walk?

Random Walk

If a noisy output signal from a sensor is integrated, for example integrating an angular rate signal to determine an angle, the integration will drift over time due to the noise. This drift is called random walk, as it will appear that the integration is taking random steps from one sample to the next.

What do rate gyros detect?

A system of three rate gyros, each oriented to one of three mutually perpendicular axes—roll, pitch, and yaw—can control a missile or aircraft by detecting angular rates and then generating proportional corrective signals.