Study On Some Key Techniques Of GPS Receiver Anti-jamming

The pattern of the future war will be "digital war" on basis of the high-tech, and the advanced navigation and positioning technology is important guarantee to "digital war". GPS is a universal positioning system, which has unexampled superiority relative to others navigation devices. It has arrested more and more people's attention. The key problem of the study lies in: how to make use of GPS for oneself effectively and destroy or jam it so that the other side can't use it. Only by this can adapt to the requirement of the modernization information war. And it is very significant to improve the performance of modernization weapon and enhance the whole battle effectiveness.This dissertation fastens one's attention upon the study of GPS anti-jamming techniques. Several schemes are put forward, whose performance is analyzed and discussed in detail. At the same time, the simulation system of jamming and antijamming for GPS receivers is developed, which provides an experiment platform for the study of GPS countermeasures. The productions obtained from this dissertation have much reference to the communication countermeasures, radar countermeasures and fuze countermeasures. The main contributions are as follows:(1) The system model of GPS anti-jamming receiver based on software radio is built. The output BER performance of GPS receivers with jamming signals (including CW jamming, AM-FM jamming, correlative jamming and noise jamming) is analyzed and simulated.(2) The feasibility and validity that subspace projection technique suppresses AM-FM jamming signal in GPS receivers is analyzed detailedly. The output SINR performance of AM-FM jamming parameters with estimation errors is deduced. The design scheme of GPS anti-jamming receiver based on time-frequency analysis and subspace projection technique is put forward, whose anti-jamming performance is analyzed and simulated.(3) The system scheme combining adaptive beamforming and software GPS receivers is brought forward, whose performance is analyzed and simulated detailedly.