雷達有源欺騙干擾多尺度特征級識別技術研究
[Abstract]:With the development of electronic jamming technology, more intense active jamming makes radar face more severe challenges. Therefore, in the complex and changeable electronic jamming environment, the radar system can identify the type of jamming signal in the shortest time, and then choose the most effective anti-jamming method to counteract it. It has become an important direction in the development of radar anti-jamming technology. On the basis of existing theoretical knowledge and related papers, this paper studies the mechanism of generation and action of conventional active deception jamming, and uses multi-scale decomposition theory to classify and identify three kinds of towed jamming and their mixed interference. The specific contents of this paper are as follows: 1: 1. In this paper, a coherent processing period pulse sequence is segmented into a one-dimensional vector, which makes up for the fact that a single pulse signal is unable to reflect the essential characteristics of the process of generating and implementing the towing interference. The effect of the number of pulse echoes contained in a coherent processing period on the classification and the final recognition results is discussed. It is found that the recognition result of multi-echo feature level is better than that of single echo, and the more the echo number, the better the recognition effect is. 2. In this paper, two multiscale decomposition methods, multiscale wavelet decomposition and empirical mode decomposition, are used to preprocess the received three kinds of towed interference signals. The wavelet domain features such as the energy ratio of the high-frequency detail component and the normalized energy of the low-frequency approximation component are extracted from the wavelet coefficients obtained from the wavelet decomposition, and the moment skewness and kurtosis in the frequency domain are extracted from the eigenmode functions obtained by the empirical mode decomposition. The feature of noise factor in equal frequency domain. According to the distinguishing degree and volatility of the extracted features under each dry noise ratio, the feature with better performance is selected as the feature factor within the feature bank, and a small feature library is established. Finally, the feature library is used to classify and identify the types of towing interference. The simulation results show that the features extracted by multi-scale decomposition can effectively distinguish three types of towing interference and obtain satisfactory classification and recognition results. In this paper, considering the simultaneous existence of many kinds of radar active deceptive jamming in practice, the multi-scale decomposition algorithm is used to decompose the received signals and extract the wavelet coefficients and frequency domain features for the mixed signals of seven kinds of cases. The mean value of each feature under all the dry noise ratio is calculated, and the small mixed interference feature database is established, and the interference signal is classified and identified. The simulation results show that the multi-scale decomposition feature library can effectively distinguish seven kinds of mixed signals, and this method is effective and has practical significance.
【學位授予單位】:西安電子科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TN974
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