The Key Technology Research Of The Panoramic Aerial Camera Dynamic Resolution Detection System

Panoramic aerial camera mounted on the aircraft is a fine optical instrument to photograph the ground scene. It is an important device in the reconnaissance carrier. The resolution detection is very important in its quality detection system. Dynamic resolution detection is an important judgment to evaluate the imaging quality when camera is in the flying situation or motion scene is imaged. The paper researched the panoramic aerial camera dynamic resolution detection system and its key technology in detail.The paper analyzes the imaging principle of the panoramic aerial camera in detail and proposes the detection scheme of the dynamic resolution. The dynamic resolution detection system is composed of the infinity dynamic object generation system and stabilized turntable to simulate the flight attitude and their mechanical and control system. The infinity dynamic target was obtained by the infinity dynamic target generation system which was set in three degree. The stabilized turntable provides the camera with operation situation of the flying attitude and forward motion. The key technologies involved in the detection system are infinity dynamic target generation technology, linear motion control technology and stabilized turntable control technology.In the paper, the infinity dynamic object generation system is constructed. The paper designed the large view field (5°) collimator (focal length is 1000mm), resolution power test target of special length (on the the standard of JB/T 9328-1999.) and uniform speed control of the linear motion system. The resolution test target is loaded on the linear motion device to get the dynamic object. The dynamic object should arrive at the view field of the collimator in the camera exposure time to simulate infinity object.The infinity dynamic object generation system proposed high request with the uniform speed, long uniform distance and large speed range (50mm/s～1500mm/s). In the paper, linear uniform motion control algorithm is researched. The non-linear PID algorithm, repetition control algorithm, friction forward compensation and moment compensation are combined and the combined control algorithm is planted to the programmable multi-axis motion controller (PMAC). Its uniform distance is longer than 300 millimeters and the error of the instantaneous speed is less than 1.5mm/s.In the stabilized turntable system, the mathematic model of the three-axis turntable is studied through the angular position description with the Euler angle. The factors affecting the image shift compensation are analyzed and dual axis stabilized turntable are employed which can meet the engineering requests. In the control system, Bayes probability is introduced in the fuzzy RBF neural network and it intensity the inference ability and increase the servo precision. The simulations show that the tracking error is less than±0.005°.The paper applied the resolution detection theory to the dynamic resolution detection system. The dynamic resolution detection is implemented by the stabilized turntable system, infinity target generation system and linear motion system. The detection of the resolution supplies important data to judge the imaging quality of the panoramic aerial camera.