Abstract: For the difficulty of accurately detecting more spatial dim and weak targets, this paper proposes a method to improve the detection sensitivity of a star sensor based on multi-frame stick of gyroscope measurement data. Before the star maps are overlaid, the angular velocity measured by the gyroscope is processed, meanwhile, the fixed pattern noise is removed. With the bright stars in the map as the reference, the difference, angular velocity deviation, between the moving vectors of the bright star calculated from angular velocity and that from the actual measurement are achieved. The accurate moving distance of the target in map will be got based on angular velocity modified. Then the star points can be stuck precisely according accurate moving distance. The target energy is effectively accumulated and the background noise reduced by sticking. Finally, through the simulation analysis and test verification, the proposed method can effectively improve the target signal-to-noise ratio so as to improve the detection sensitivity.

Key words: The dim targets in space, Gyroscope, Angular velocity, Muti-frame stick, Signal-to-noise ratio, Sensitivity