Analysis And Evaluation Of Link16 Data Link Anti-jamming Performance

In modern electronic warfare,in order to obtain the wartime information in time and seize the initiative in the war,weapon equipment is very important,powerful weapons of war can do twice the job with half the effort.Tactical data link played an extremely important role in the early military war and brought great advantages to the countries equipped with tactical data link.Since then data link has become the focus of attention of various countries.At present,fighter planes,ships,satellites and ground equipment of various countries have been equipped with different types of data links.The development of new data link and the research of data link system performance have always been a hot topic for military experts.Therefore,in this paper,Link16 data link with complete functions and strong anti-jamming ability is selected as the key research object.To study the response of Link16 data link under jamming,and evaluate its anti-jamming performance comprehensively.The main research work of this paper is as follows:Firstly,study the related technologies of the physical layer of Link16 data link,such as:cyclic redundancy check(CRC)(237,225)encoding and decoding,reed solomon(RS)(31,15)encoding and decoding,interleaving and deinterleaving,cyclic code shift keying(CCSK)(32,5)spread spectrum,minimum shift keying(MSK)modulation and demodulation,fast frequency hopping(FH).Meanwhile,the link model of Link16 data link is built.Moreover,the anti-jamming performance of Link16 data link under four data package formats and the system performance after using the related anti-jamming technologies are simulated and analyzed.Secondly,by modeling several main jamming patterns and jamming signals,the anti-jamming performance of Link16 data link is simulated and analyzed under different channels and jamming environments.First,the influence of different jamming signals on Link16 data link under the additive white gaussian noise(AWGN)channel is analyzed,and some conclusions are drawn.For broadband blocking jamming,the jamming effect of three interference signals on Link16 data link is different,and sawtooth frequency modulation jamming signals have better jamming effects.Among several technologies related to anti-jamming performance,CCSK(32,5)soft spread spectrum has a great influence on Link16 anti-jamming performance.Using sawtooth sweep jamming signal to carry out partial band blocking jamming on Link16 data link,the jamming effect is better than that of broadband blocking jamming.Secondly,this paper choses Nakagami-m fading channel model and derives the bit error rate(BER)formula for the performance of Link16 data link with multi-tone jamming through this channel model,and uses simulation to verify the accuracy of the BER formula.The simulation results further show that with the increase of fading parameter,the system performance of Link16 data link can be improved obviously.It is not necessary to interfere with all frequency points in multi-tone jamming,under the condition of a certain jamming-to-signal ratio(JSR),a better jamming effect can be achieved by selecting about 20 frequency points.Finally,based on cloud model and grey relational analysis(GRA),a universal anti-jamming performance evaluation model of Link16 data link is proposed.The principles and implementation steps of various evaluation methods are briefly introduced,and then the system parameters and anti-jamming ability of Link16 data link are qualitatively analyzed,the indicators are selected to establish a reasonable evaluation indicator system,and finally the appropriate evaluation methods are selected and a general evaluation model is created.The evaluation model can effectively evaluate the anti-jamming performance of Link16 data link,and can judge the role of anti-jamming means of Link16 data link in anti-jamming,and finally select the best anti-jamming means.