Real-time Embedded Photoelectric Targeting Pod Transfer Alignment System Design

Electro-optical targeting pod has capability of automaticly recognize target, tracking, long-range attack, day and night combat in all-weather condition, thus it plays a vitally important role in modern high-tech warfare. As the background of electro-optical targeting pod mounted under the XX warplane, to preciously and quickly track the target, strapdown inertial navigation system (SINS) integrated with electro-optical-targeting pod system is proposed; meanwhile the transfer alignment function is applicated in it. When the fighter maneuvers including taking-off run, the transfer alignment function will automatically calibrate target betwine the line of sight and in aircraft head-up display.Fistly, the basic principle of SINS is briefly introduced, and the method of resolving navigation parameters is summarized. Then the transfer alignment timing sequence of optical-targeting pod is analyzed and standard Kalman filtering method is described. Secondly, speed matching transfer alignment algorithm model is built; then the digital simulation of it is conducted by Matlab. According to demand, Inertial Measurement Unit, real-time embedded processor PowerPC (MPC8245), real time operating system VxWorks are analyzed and determined, which make up the whole transfer alignment system. Lastly, the overall real-time multitasking frameworks of transfer alignment for Electro-optical targeting pod is analyzed and designed.Under the development environment tornado of VxWorks RTOS, the real-time multitasks of transfer alignment in moving base is programmed, program code is optimized and debugging experiments is carried out. Thus the design of the transfer alignment multi-task framework was completed, and experiment was done many times. The experiment result shows that the feasibility of the whole designs of multi-task of transfer alignment in real-time embedded systems, which meets the requirements of practical engineering. It provides reference for the practical engineering in the future.