【作者】 杨长生；

【导师】 李志舜；

【作者基本信息】 西北工业大学 ， 信号与信息处理， 2002， 硕士

【摘要】 本文研究了宽带主动信号检测的理论和技术问题。宽带主动信号检测的基础是宽带相关处理。连续小波变换与宽带相关处理的内在一致性使得连续小波变换成为宽带相关处理的数学基础，为宽带相关处理的实现提供了数学支持。宽带模糊度函数是宽带信号分析的有力工具，它与连续小波变换也是内在一致的。总之，连续小波变换是宽带主动信号检测的数学工具，为宽带信号检测提供了理论和技术的支撑。本文的工作如下： 1．论述了宽带信号处理的基本理论，指明了连续小波变换与宽带相关处理、宽带模糊度函数的一致性。 2．研究了连续小波变换的计算结构，给出了基于FFT和Mellin变换的两种连续小波变换快速算法，为宽带相关处理的快速实现提供了基础。 3．以宽带模糊度函数为工具定性地分析了两类典型宽带信号，即调频信号和频率分集信号。获得了多普勒宽容信号，多普勒敏感信号和时延尺度二维联合分辨信号等宽带信号。为宽带信号的检测、参数估计等应用提供了备选信号。 4．给出了宽带主动信号检测器的形式，并进行了仿真研究，证明宽带检测器的有效性，同时验证了非矩形包络双曲调频信号为最佳检测信号。更多还原

【Abstract】 The theoretics and technique of wideband active signal detection is researched in this dissertation. Wideband Correlation Processing (WCP) is the base of wideband active signal detection. Cause of the coherence between Continuous Wavelet Transform (CWT) and WCP, CWT forms mathematic foundation of WCP and presents mathematic support to WCP. Wideband Ambiguity Function (WAF) is the powerful tool to analyze the wideband signal, and it is also coherent to CWT. All in a word, the CWT is the mathematic tool of wideband active signal detection, and can underpin wideband active signal detection in theoretics and technique. In this dissertation, some contribution had done as listed:1. The basic theory of wideband signal processing is discussed and presented. The coherence among CWT, WCP and WAF is pointed out emphatically.2. The computation structure of CWT is studied. Fast algorithms based on FFT and Mellin Transform are proposed, which can realize the fast WCP.3. Two kinds of typical wideband signal, Frequency Modulation (FM) signal and Frequency Spread signal, is analyzed qualitatively with Wideband Ambiguity Function. Then author obtain Doppler tolerant signal, Doppler sensitive signal and time-scale combine resolution signal. Thses signals can be used in detection, estimation and other applications.4. The wideband active signal detector is presented and simulation is given. The result proves this detector is efficient, and that non-rectangle enveloped HFM signal is the optimal detection signal.更多还原