Research And Development Of GNSS Jamming Countermeasures Simulation Software

As a high-precision navigation and positioning system,Global Navigation Satellite System(GNSS)has been widely used in national military defense and public security fields.Due to the relatively low power and wide bandwidth of satellite signals arriving at the receiver of GNSS system,it is faced with a complex electromagnetic environment.No matter in civil or military background,it is faced with various forms of jamming,especially for the loopholes of GNSS system,there are various artificial jamming and spoofing.This project belongs to China’s "the Belt and Road" project,and a set of GNSS system jamming countermeasure simulation software is developed for the teaching and training GNSS system jamming countermeasure by the network Army of a "the Belt and Road" country.With GNSS vulnerability attack and defense simulation as the starting point,this topic develops GNSS jamming countermeasure simulation software based on network space according to the basic theoretical knowledge and model of jamming and anti-jamming.The software includes three parts: constellation simulator,jamming source simulator,and receiver simulator,which perform data interaction and coordination work based on networks and switches.Specific works are as follows:1)This thesis mainly focuses on GNSS jamming countermeasures,focusing on the jamming source to implement the jamming,and the receiver to fight the jamming.Firstly,the positioning principle of GNSS is expounded,the vulnerability of GNSS and the classification of jamming are analyzed,and the human jamming in GNSS jamming is divided into compression jamming and spoofing,and the basic principle,time domain and spectral characteristics of jamming signal generation are studied.2)Aiming at the suppressive jamming,GNSS jamming suppression algorithm is studied.In this thesis,space-time adaptive zero-trap anti-jamming method is adopted,and the algorithm theory and mathematical model formed by the four-array uniform circular array antenna direction diagram are studied.The anti-jamming performance is analyzed by MATLAB simulation.According to the spatial angle of jamming and useful signal is independent,the unconstrained power inversion air time adaptive algorithm is used to generate zero trap in the direction of strong jamming signal,so as to suppress jamming.3)According to the project requirements,on the basis of algorithm research and index analysis,GNSS jamming countermeasure simulation software is designed and implemented based on WPF technology.It simulates electromagnetic signal propagation by means of network communication,realizes the simulation of conventional jamming and spoofing,realizes satellite signal reception,constellation visualization,signal adjustment and forwarding,realizes the jamming of jamming source to receiver,receiver anti-jamming,anti-jamming antenna pattern modeling and other functions.All effects and functions are rendered through computer terminals.Based on the theory and model of jamming countermeasure,this thesis develops a GNSS jamming countermeasure simulation software on the basis of resolving the channel transition from free space to network space.The research results of this thesis can be used as a teaching and experimental platform for GNSS attack and defense,which is conducive to the promotion and popularization of GNSS knowledge,and has a certain promoting effect on the application of the Beidou system in China.