| Aircraft attitude change is one of the main factors to affect the imaging quality ofthe push-brooming aerial camera. In the camera cycle, the attitude of the aircraft such asyawing, pitching and rolling will change. As a result, the image motion happens.Consequently it is imperative to analyze the influence of the attitude change to theimaging quality of the aerial push-brooming camera, and the image motioncompensating method must be researched.In this paper, the image motion model of the aerial push-brooming camera wasestablished by the coordinate transformation method. Then the formula of imagemotion caused by the attitude change of the aircraft including yawing, pitching androlling was derived. The result of analysis and calculating showed that image motioncompensating was necessary.The scheme that compensated the image motion caused by yawing, pitching androlling of the aircraft through a three-axis gyro stabilized platform was put forward.After analysis the compensating principle, a high-precision platform was designed.And the zero-deviation of the platform was calculated. The theoretical residual error ofthe image motion which was compensated by the three-axis gyro stabilized platformwas analyzed using the coordinate transformation method. Then there were37kinds oftypical cases which were used for analysis, and the results met the requirement for use.The accuracy of position compensation and speed compensation of the three-axisgyro stabilized platform was tested in the laboratory by inputting different amplitude and frequency of position and velocity signal. The test results showed that thethree-axis gyro stabilized platform met the requirement for use.Numbers of flight tests were held to verify the actual compensating accuracy of thethree-axis gyro stabilized platform. As a result, the image resolution was improved by10lp/mm if the three-axis gyro stabilized platform was applied to image motioncompensating. |
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