Accuracy estimation of determining attitude of coordinate systems of BOKZ-M60 star sensor

We investigate the accuracy of measurement data that were obtained during testing BOKZ-M60 sensor in the special testbed in RSSI RAS. The testbed has a movable platform, where the sensor BOKZ-M60 is fixed. The platform has three degrees of freedom and moves according to PC program. But its motion is not known with a sufficient accuracy. We approximate the motion of the platform in two ways and use the errors of those approximations to estimate the errors of the measurements. One way is a representation of the motion as a combination of two Euler rotations. The first rotation describes the rotation of the Earth; the second rotation is caused by periodic oscillations of the platform. The parameters of the rotations are determined by sensor measurements. The second way consists in approximation of the motion by discrete Fourier series. Both ways gives consistent estimations. The errors of measurements depend on a type of platform motion and are in the range from 2 to 25 arc seconds.