Research On Adaptive Anti-interference System About GPS Signal

GPS has advantages as follows: globosity, all-weather, low cost, high definition, error no change with time and so on. Due to these advantages, GPS is widely used in civil and military field. Meanwhile, GPS also has disadvantages, such as easy interfered signal, poor dynamic performance, and low output frequency, and it introduce study on anti-jamming performance of GPS. We use an experiment to verify remarkable anti-interference with theoretical model simulation and designed integral circuit of GPS receiver in this paper.On theoretical side, we firstly study on anti-interference technique of GPS/INS integrated navigation, and put forward error model of integrated navigation. Design Kalman filter, with taking gesture, speed and error of position as state variable. Through simulation of computer, verify this program theory is feasible, and in interferential condition, it can still realize real-time navigation. Secondly, we advance a new anti-jamming GPS, in which interleaving technology is embedded, and analyze its principle and practical application. Finally, we make comparison of these two schemes, and take the more reasonable one. Then verify it with hardware.On experimental side, because inertial device is expensive, we only make theoretical studies. Experimental platform is composed of RF front end, ARM and FPGA. Interleaving technology is embedded into receiver, through FPGA programming. Through experiments, this scheme is proved to be feasible, and it enhances GPS receiver anti-interference. Finally, we achieve prospective effect.