基于盲壓縮感知的非合作跳頻信號(hào)處理技術(shù)研究
[Abstract]:Since the beginning of the 21st century, the form of war has gradually changed from the original mechanization to the informatization. The confrontation between the two sides is no longer limited to the competition of strategic equipment, and the efficient and accurate means of information processing has become a crucial factor in determining the direction of the war. Non-cooperative frequency hopping signals have been extended in information warfare because of their good robustness against far and near effects and interference. The correlation characteristics of non-cooperative frequency hopping signals are studied, and effective interception, identification and recovery algorithms are found. It is one of the most attractive topics in the field of military communication. With the maturity of hardware facilities, non-cooperative frequency hopping signals gradually develop to the direction of "high speed hopping, multi-frequency points, super-bandwidth", and the complexity of signal waveforms increases sharply, but the prior information contained is very little. All of these present unprecedented challenges to modern signal processing methods. Blind compression sensing theory is a sampling reconstruction framework based on projection measurement, sparse coding and transform base construction process. On the one hand, the theory retains the advantages of the traditional compression sensing theory of compression sampling, using projection measurement to extract useful information from the signal, on the basis of not destroying the structure of the target signal, maximum compression of the amount of data; On the other hand, the theory combines dictionary learning process and finds a pair of optimal product sparse matrix and transform basis by alternating iteration, which can be used to restore the original signal structure. Blind compression perception theory really realizes the idea of non-prior information reconstruction, which provides an important theoretical support for the development of non-cooperative communication. In this paper, the non-cooperative frequency hopping signal processing technology based on blind compression sensing is studied, including the establishment of signal model, the reconstruction of blind compression and the estimation of jump parameters. This paper first introduces the introduction and popularization of frequency hopping technology, and summarizes the existing frequency hopping signal processing methods. This paper introduces the process of the blind compression perception and the corresponding formula theorem, summarizes the three restriction conditions and the corresponding optimal algorithm to make it satisfy the uniqueness, and analyzes and compares the respective characteristics of the three algorithms. Then, the components, important parameters and modulation methods of non-cooperative frequency hopping communication system are introduced. According to the definition of non-cooperative frequency hopping signal, the appropriate parameter values are selected and the simulation results are obtained. The blind compression sensing theory is introduced to restore the signal structure. According to the experimental data, the influence of the parameters on the reduction quality is analyzed. Finally, on the basis of accurate reconstruction, the non-cooperative frequency hopping signal is studied in frequency domain, and the estimation method of hopping frequency and period is proposed. According to the simulation data, the factors affecting the estimation quality are analyzed.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TN911.7;E96
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