Study On Jamming Algorithms And Efficiency Analysis Against New GNSS Signals

Global Navigation Satellite System(GNSS)can provide all-weather,continuous and real-time navigation services,and has covered the sea,land,air and space fields.With the continuous upgrading of GNSS,the new Binary Offset Carrier(BOC)family modulation technology is gradually put into practical application.In the modern military confrontation,widely used precision guided weapons and unmanned combat platforms are generally dependent on GNSS signals,which gradually led to the theoretical research and practical application of GNSS signals jamming techniques as a countermeasure.In the civilian area,the relevant jamming technology has also been used to confront small unmanned aircraft entering the restricted area without authorization to achieve the necessary protection of the airport.Therefore,under the background of increasing information confrontation based on complex electromagnetic environment,it is of great theoretical and practical value to strengthen the research on the new system of satellite navigation signal jamming.This thesis focuses on jamming algorithms and efficiency analysis against new GNSS signals,the main research contents include:(1)The fundamental principle of BOC signal is studied.The spectrum of BOC signal is split and the energy of the signal is shifted to both sides.Based on BOC signal,new multiplexing modulation signals are obtained including TMBOC signal,AltBOC signal and B1 C signal.Their autocorrelation functions and normalized power spectral density are analyzed.(2)Aiming at the modulation signal of BOC(10,5)in satellite navigation system,the jamming methods such as continuous wave jamming,band limited Gaussian white noise jamming,sine wave FM jamming,triangular wave FM jamming,binary phase modulation jamming and pseudo-code related interferenc are analyzed.(3)From the aspects of generation of GNSS modulation signals,modulation of baseband and IF signal,digital-analog conversion,up-conversion and power pre-release,DSP module,FPGA module,digital to analog conversion module,orthogonal frequency conversion module and Power pre-release module,describes the main functions and design principles of each module.(4)For GNSS signal jammer,the jamming signal power and anti-jamming margin received by GNSS are analyzed.Then a comprehensive three-dimensional distributed satellite navigation jamming method is proposed and the GNSS distributed jamming three-dimensional networking software is developed.