Technology of Image Motion Compensation for Different Velocity of Aerial Camera Based on Integration Level and Frequency Division Control

Abstract

When an aircraft is flying sideways, the aerial camera will be in a squint state, and there will be multiple image motions of different sizes on the imaging target at the same time. In this paper, the principle of different velocity image motion in squint imaging of an aircraft is analysed, and the compensation strategy of different velocity image motion is proposed. Then, three methods are used to analyse the adjustment strategy of different velocity image motion compensation, namely, adjusting the integration level of (Time Delayed and Integration) TDICCD, grouping and frequency division control of TDICCD on the image surface, and optimizing the control based on the combination of integration level and frequency division control. Through the simulation analysis, it is concluded that the adjustment of the integration level of TDICCD and the slice grouping control is the optimal method. This method not only ensures the required image SNR of the optical system but also reduces the complex problems of electronic circuit and control system caused by the presence of too many segments and groups. In the actual aerial camera system imaging, this method can be used as an effective method for the compensation for the image motion of different velocity when the aerial camera tilts. Then, the design of the driving circuit and timing generator are described. The validity of the method is verified by indoor simulations and a flight test.