Research On The Jamming Of Joint Tactical Information Distribution System(JTIDS)

In the high-tech war,getting the power of controlling information becomes the key factor.Information warfare emphasizes on system confrontation.To obtain information superiority and initiative control in the war,it demands a comprehensive control of the battlefield situation,implementing effective command and control, exerting the cooperative engagement capability of the participating units and maximizing the combat effectiveness of the mechanized weapons platforms.JTIDS(Joint Tactical Information Distribution System)is an important part of the command automation system(C~4ISR)of US military.It is a coordinated system of communication,navigation and identification developed by US military for the purpose of suiting the combined operations.It has played a more and more important role in the Gulf War,the Kosovo War,the Iraq war and other modern wars.Therefore, the research on jamming JTIDS has the profound realistic significance.There are higher technical requirements to jam the system because JTIDS uses multiple anti-jamming techniques such as spread spectrum,channel error detection and correction coding and emission encryption.Although the research on jamming JTIDS has made rapid progress,there are still many problems that need to be resolved. This thesis has a further study of jamming technique of JTIDS with a view of system's message mechanism.Firstly,this thesis gives the chief points of JTIDS and discusses the network form,slot allocation,message types,signal formats and packaging methods.Secondly, studies the direct sequence spread spectrum,frequency-hopping spread spectrum, time-hopping spread spectrum,channel coding and other anti-jamming techniques. Then analyzes the basic mode of communication countermeasure,the factors that can influence jamming effect,optimum jamming waveform and the feature of communication interference signal in frequency domain,time domain and the level requested,discusses the technical requirement of jamming JTIDS on the two aspects of information data and synchronization data,further studies a jamming methods that is multi-channel jamming.Finally establishes JTIDS system simulation model, simulates the system's anti-jamming performance.At the same time simulates and produces four jamming signals,compares the jamming JTIDS results of two typical signals.It proves that the interference effect of PN code MSK modulation is obviously better than others through analyzing the simulation results.