Satellite Navigation System Complex Interference Simulation Signal Source Design

Based on the immunity tests and interference simulation requirements on satellite navigation systems, relevent work such as principle analysis, technology inspection, design realization and test for verification was done for complex interference signal simulator for the special purpose of satellite navigation system. In this paper, firstly it made a theoretical overview of the basic principles of the interference signal simulation, which is explained from three levels such as level of system, level of the object of interference and level of interference intention of interfering factors, then the interference pattern is described from three levels of the single interference, the combination of interference and interference scene, after which the mathematical model and simulation principle of modulation interference, noise and deception jamming, multiple access interference, frequency hopping interference and interference scenarios are given respectively, with the basic principles of RF quadrature modulation techniques. Secondly, based on software radio, the dynamically reconfigurable technology and its technical approach of interference simulation source is given with the analysis of technical features and advantages, focusing on its application in various types of interference signals, such as modulation, noise, deception, multi-access, frequency hopping, interference scene simulation, especially on the relization approach for deception jamming signals between satellite-earth, satellites and stations.In addition, from four dimensions of the inhibition of the mirror frequency, high dynamic, high linearity, small step, the realization of the interference source radio frequency circuit is also given.Based on the above design principles and technical approach, complex interference signal simulator engineering prototype are designed and realized, mainly described from the aspects of system architecture, information flow, design principles of the various sub-systems, hardware structure, thermal design, and many other aspects to complete engineering design course. Finally, the test program of interfere simulation source is proposed and implemented. The test shows that the finally realization of the engineering prototype basically meet the engineering demands, which well supported mid-term system test experiment on special subjects and established good theroy and engeering foundations for the followed development of formal devices.