The Real-time Video Processing System Develop Of Photoelectric Theodolite Simulator

In aviation, aerospace, military simulation and so many of development and research process,aircraft, which was used in study, measurement data acquisition is essential. Photoelectric theodolite measurement equipment, as a branch of photography, widely used in kinetic energy aircraft tracking data acquisition and flight status of optical measurements. However, because of the kinetic energy aircraft's complex track, high speed, mobility, small targets and distance, operator must go through rigorous training in order to accurately track the kinetic energy aircraft.In many photoelectric theodolite simulation training program, moving target simulator by hardware interface is the only can realize the true, real-time, full-featured simulation programs for photoelectric theodolite. But because the technical level is not enough to achieve difficult. In recent years, with the microelectronic technology, VLSI technology and digital signal processing technology development and wide application, the program can be achieved. This paper describes hardware and software design of the real-time video processing system used in photoelectric theodolite simulator.Firstly, the paper analyze the principle, interfaces and technical conditions of the photoelectric theodolite infrared imaging components, 1Kx1K progressive scan monochrome camera, and the photoelectric theodolite visible light imaging component, infrared imaging equipment based on sterling refrigeration.Secondly author reference and introduced LVDS(low voltage differential signaling) applications and design, Camera Link interface standard and the CVBS(composite video broadcast signal) signal theory.Thirdly, the paper introduces the video sampling rate conversion principle, and according to the system need about deinterlacing, frame rate conversion, video scaling, analyze correlation algorithm.In the next, the author discribes his PCB design and layout, demonstrates its hardware precept and drawes the hardware platform. Circuits'theory and design process analysis are the key focuses, which set up a good hardware platform for video collection and processing.At last, this article introduces the FPGA design flow, design demand module includeing video capture initialization based on I2C bus, video sampling rate conversion architecture based on edge detection and vertical filtering, ITU-R BT.656 video stream decoder, and them, simulation waveforms and results are given.The system, which comes from the cooperation research projects, would be used in photoelectric theodolite moving target simulator, has important practical significance. The design makes full use of the advantages of FPGA device, the system more flexibility and cut resistance good integration and so on. The entire system has good scalability, can be developed for the project provided a platform for the follow-up basis.