Navigation Receiver Airspace Adaptive Interference Suppression Technique And Realization

Modern satellite navigation system provides high precise time information and navigation service for military applications, at the same time, there are many aspects of civilian applications, such as ocean succor and car navigation,since it can provide high accuracy positioning and timing with the navigation characteristic of a whole day service, real time, continuity and passivity. The satellite is far away from the earth, the power level of satellite navigation signals arriving at the earth is so low that the navigation receiver is vulnerable to various kinds of intentional and unintentional interference and may lose lock to navigation signal. Thus, it is very important to study the anti-jamming technology for navigation receiver.This thesis focuses on enhancing the anti-jamming ability of navigation receiver antenna. A design method based on antenna arrays and adaptive algorithm is presented. In the research of adaptive algorithm, by combining analyzing of the theory to MATLAB is used to simulate the anti-jamming performance of power inversion algorithm and RLS algorithm .And it is proved by experiments about the performance of chosen antenna arrays and the validity of this algorithm. Then, the normal power inversion algorithm is proposed as the key of anti-jamming system design.Then, Space-time processing methods used in the navigation receiver can provide a sufficient number of degrees of freedom to cancel a large number of wideband and narrowband interferers. Therefore, this dissertation research on space-time subspace projection techniques in navigation receiver for interference suppression. The method employs the property of multistage Wiener filtering reducing the computation while the anti-jamming performance is not affected. The performance in numerical simulation demonstrates that it is effective and efficient to both narrowband and wideband interference. Moreover, Improved space-time anti-jamming techniques is proposed, it can keep anti-jamming performance, even though in a finite-precision implementation. Thus, the method will more efficient for engineering applications.Finally, From a prototype designer point of view, actual interference environment and the initial stage of this project. The power inversion algorithm and normal power inversion algorithm is implemented based on FPGA technique, the result of emulation on a FPGA chip shows that the design in this thesis is valid.