DSP-based Research Of Anti-jamming Technique For Antenna Of GPS Receiver

Global Positioning System is a high precision system that has powerful ability of navigation and positioning. It can provide users with all-weather information about three-dimensional space position, velocity and time. But because of the affect of interference, GPS receiver often works in an unstable statement or even is totally out of work. The research about anti-jamming technique for GPS receiver is designed and validated by analysis, simulation and emulation.This thesis focuses on enhancing the anti-jamming ability of GPS receiver antenna. And a design based on antenna arrays and adaptive algorithm is presented. In the aspect of choosing object for anti-jamming, a conclusion that the oppressive interference is the most menace to GPS receiver is drawed by analysing the characteristic of GPS signal, the anti-jamming ablity of GPS receiver and the method in which interference works on receiver. In the research of adaptive algorithm , power inversion algorithm is proposed as the kernel of anti-jamming design by comparing among several precepts. In- the research of rationality of this algorithm, MATLAB is used to simulate the environment of interference and satellite signal sources. And it isproved by- experiments about the performance of chosed antenna arrays and the?validity of this algorithm. Finally in the research of realizing the algorithm based onDSP technique, the result of emulation on a DSP chip shows that the design in this thesis is valid and can process data in real time.