Strapdown scene matching location approach for aircraft with attitude variances

Geometric rectification problems of the strapdown scene matching for aircraft with attitude variances are investigated. Firstly, by analyzing the main factors causing geometric distortion in the process of real-time image capturing, two coordinates system are established, the real-time image distortion is classified, and the distortion mathematic models are proposed. Then, according to the altitude and attitude angle information of the aircraft camera, the geometric rectification of the real-time image is realized, where the center point error between the realtime image and original one and the size of the real-time image can also be determined. Furthermore, a strapdown scene matching approach is shown for aircraft with attitude variances. Finally, a simulation example is given to demonstrate the validity and the efficiency of the proposed approach.