Analysis And Application Of Emitter Characteristics Based On Channel Estimation

Under the condition of non-cooperative reception,the analysis and application of emitter characteristic are research hotspots in the field of electronic reconnaissance.When the transmitted signal arrives at the receiving end through the channel,the intercepted signal carries specific channel information related to the location of the source,the physical environment,the reflected target and the like.At present,the study of electronic reconnaissance mainly focuses on characteristics of the emitter itself,but there is little research on the channel information of the intercepted signal.Starting with characteristic analysis of the wireless channel components of the intercepted signal,the specific channel information can be obtained,which will enrich the research direction of characteristic analysis of the emitter and extend the application range of characteristic analysis of the emitter,so that the differentiation of emitters in the special scene becomes possible.In this thesis,the wireless channel component of the intercepted signal of the emitter is taken as the research object,and the discrimination of emitters in the special scene is explored as the research target.The research priorities of this paper focus on the characteristic analysis scheme of the wireless channel component of the emitter,the blind equalization algorithm and the feature extraction and comparison problems.Combined with analysis and research numerous actual tests are carried out to verify the characteristic analysis scheme.The main content of this thesis are as follows:1.The model of intercepted signal is studied.The components of the intercepted signal and its information are analyzed.The wireless channel components and their characteristics are studied.The fading channel and its statistical characteristics and generation are analyzed.Combined with the model of intercepted signal and the discrimination problem of emitters in special scenarios,a characteristic analysis scheme based on wireless channel component of emitter is proposed.2.Several classical Bussgang blind equalization algorithms are studied.The similar performances of constant modulus equalizer and Wiener equalizer are compared.The main influencing factors of constant modulus algorithm are analyzed.The specific algorithm applied to the scheme of this paper is given.At the same time,the index for evaluating the convergence of the algorithm for this scheme is studied.3.The feature extraction and comparison of the wireless channel component are studied.A feature extraction method and its specific process are proposed.The fine feature extraction and analysis of the simulation channel is completed.The characteristic analysis simulation system of the wireless channel component for emitters is designed,and the related simulation results are analyzed.The differences of wireless channel components are studied.The verification and analysis of the scheme are carried out in terms of time domain,frequency domain and bit error rate.4.The emitter discrimination based on the characteristics of wireless channel component is studied.A data processing method and its specific process based on feature comparison are proposed.By repeatedly improving the experimental conditions and scenarios and combining data analysis,the experimental scenarios and parameters which can simulate the difference of multipath channel under the condition of the short distance based on YunSDR are finally designed.The emitter discrimination based on the characteristic analysis scheme of the wireless channel component of emitters is preliminarily realized.The design and analysis of the experimental system for analyzing and comparing the characteristics of wireless channel components are completed.Under the condition of static transmission and reception,the effects of distance,antenna direction,obstacle,frequency and receiving and transmitting position on the wireless channel components are studied.The stability and difference of the actual wireless channel are analyzed and studied,and the feasibility of the scheme is verified.