Design And Implementation Of Anti-Jamming Navigation Receiver

At present, the satellite navigation system has a wide range of applications in the civil and military fields, affecting the country's scientific and technological strength and military strength. However, due to the complex working environment and the vulnerability of navigation signals, satellite navigation systems are susceptible to environmental interference. In addition, because of its important role in various fields,will also face a variety of man-made interference, which is likely to cause the receiver to not work properly. Therefore, since the 1990s, foreign research institutions have done a lot of research on anti-jamming technology theory and implementation of satellite navigation systems. Domestic research started relatively late, but the current progress quickly through the study of foreign research experience. In this background, the anti-jamming principle of anti-jamming system is studied, and the hardware design and realization of digital signal processing board are completed in this thesis.Firstly, the anti-interference principle of satellite navigation system is studied.Aiming at the interference of the receiver in the environment, the interference is classified and analyzed. And the clear understanding of the interference is helpful to the research of anti-jamming technology. On this basis, the overall structure and function of the navigation anti-jamming system are analyzed. It can be seen that the digital signal processing board is the platform to achieve anti-jamming algorithm, but also the core module of anti-jamming system. The principle of several anti-jamming filtering techniques is introduced according to the different processing domains, and their strengths and limitations are analyzed.Secondly, the focus is on the overall hardware design and implementation of the digital signal processing board. The main structure and signal processing of digital signal processing board are introduced. Detailed description of the A / D module, D / A module, FPGA module and other major modules of the chip selection and peripheral circuit design. And the overall PCB board design and hardware in kind of digital signal processing board is given.Finally, the anti-jamming system was tested in two parts. Each module of the digital signal processing board is tested in the room, and the experimental results are given. Then, the anti-jamming capability of the anti-jamming system is verified by field experiment. According to the experimental results, the digital signal processing board designed in this thesis can play a role in the anti-jamming system, with the ability to suppress interference.