| With the rapid development of information,in the future informatization confrontation,who can obtain information resources in the shortest time,who will be able to take the lead in the confrontation,and the data link as the carrier of its information transmission will be the victory and defeat Plays a vital role.Therefore,the research on the anti-jamming performance of the data link will become an important technical support in the future informatization confrontation.The most popular data link is Link 16,so the data link studied in this article is mainly designed and built with reference to the Link 16 standard.Mainly conducted in-depth research on the anti-interference performance of the data link,made some improvements to the link in the channel environment with poor performance,and proposed an anti-interference enhancement technology to face the more severe interference environment.The main work of this article is as follows:1.In-depth study of the data link based on existing data,and the basic definitions,characteristics,functional composition and other theoretical systems of several major data links are discussed,introducing typical data links and the generation and development process.2.Established the basic model of the data link transmission waveform,and conducted a detailed study on the composition of the link,focusing on the CRC(Cyclic Redundancy Check)codec,RS(Reed-solomon)codec,interleaving,CCSK(Cyclic Code Shift Keying)soft spread spectrum,MSK(Minimum Shift Keying),frequency hopping and other key technologies were analyzed and simulated,and the simulation of the data link transmission waveform on MATLAB was completed.3.A detailed introduction to communication interference and an in-depth analysis of several major interference patterns.Introduced several different interference environments,and analyzed,modeled,and simulated the interference signal sources that may appear in the environment,and then simulated the data link built in this article in different interference environments.Analysis of the anti-interference performance of the data link transmission waveform under the interference environment,and some conclusions are drawn:The data link has certain anti-interference ability under different interference environments;By analyzing the frequency interval of users and the number of multi-users in the interference environment,the internal relationship between the number of frequency points,frequency intervals and the maximum number of supported users of the link mentioned in this paper is revealed;Due to the frequency hopping technology in this link,it is more effective to align its frequency points for interference,and under the condition that the interference power is fixed,Interfering with some of its frequency hopping points to obtain a compromise between power and interference performance.Finally,a burst interference channel is introduced,that is,the burst error exceeds the decoding ability of the RS,and it is found that the performance of the data link deteriorates rapidly under this kind of environment,and the bit error rate is high.4.Proposed an LDPC code based on GF(q),briefly introduced the development of LDPC code,then introduced the construction,coding and decoding of multivariate LDPC code in detail,finally,this technology is introduced into the data link studied in this paper,and an improved link is obtained,and it is found that its anti-interference performance is significantly better than the original link,especially against the burst interference channel beyond the RS decoding range mentioned above. |
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