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3mm波段瞬态信号的采集与处理
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摘要
本文是国防重点科研课题“3mm脉冲雷达探测技术”的组成部分之一。论文系统的研究了3mm波段瞬态信号的采集及其处理的问题。
     根据课题的实际需要,本文提出了一种可行的采集方案,设计完成了一个实用的毫米波瞬态信号的采集系统,为论文后面的工作提供了大量实际信号的数据。
     为了提取出毫米波瞬态信号中反映目标的信息,提高目标的识别率,本文将小波分析和神经网络引入了瞬态信号目标识别中。文中提出了首先用小波分析方法提取出瞬态信号的各级小波分解能量,然后再用RBF神经网络对提取的特征向量进行分类。最后,为进一步提高分类的稳定性,还对RBF网络中RBF中心的确定算法进行了改进,取得了令人满意的识别效果。
     论文中完成的瞬态信号采集系统为开展毫米波雷达目标识别的研究工作提供了便利。文中将小波分析与神经网络相结合的方法引入了瞬态信号处理,为提取目标特征,提高目标识别率开辟了一条新的途径。
This paper is a part of the important national defence research project-Research on the technique of three millimeter pulsed Radar. In this paper, the problem of the transient signal sampling and disposing of three millimeter wave band is systematically investigated.
    According to the practical condition, a feasible collecting scheme is proposed, and an economical collecting system of the transient signal of millimeter wave is designed and completed, which supplied many real datum for later work in the paper.
    Wavelet analysis and neural network are introduced to the target recognition of transient signal in the paper, in order to extract the information that can reflect target in the transient signal of millimeter wave and raise the recognition rate of target. At first, all levels energy of wavelet decomposed in the transient are extracted by the means of wavelet analysis, then the extracted feature vectors are classified with RBF neural network. A ameliorating arithmetic is taken on the RBF neural network of RBF center to further improve the classifying stability, in the end, which achieves satisfied recognition results.
    The transient signal collecting system which is constructed in the paper supplies convenience for the research of the target recognition of millimeter radar. A hopeful new way is explored for extracting feature of target and raising the target recognition rates by combined wavelet analysis with neural network.
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