论文部分内容阅读
针对现代载频测量对信号的实时捕获、频率带宽和分辨率的要求,提出了一种利用声光偏转效应的相干光信号处理方法。从理论上对声光效应的Bragg衍射机理和条件进行了描述,分析了随机载频信号捕获、带宽特性和频率分辨率与声光偏转的关系,给出了系统的构成原理和测试方法。通过实验测试和计算机仿真,证明了声光偏转技术能很好地解决并行随机载频信号和频率分辨率的问题,系统性能和信号的实时处理效果得到了明显的改善,带宽达到了300MHz,频率分辨率优于1MHz。这种方法对随机信号载频的跟踪和测量精度优势突出,可应用于雷达信号探测和光电对抗。
In order to meet the requirements of real-time signal acquisition, frequency bandwidth and resolution in modern carrier frequency measurement, a coherent optical signal processing method based on the acousto-optic deflecting effect is proposed. The mechanism and condition of Bragg diffraction of acousto-optic effect are theoretically described. The relationship between the signal acquisition, bandwidth characteristics and frequency resolution of stochastic carrier and the deflection of acousto-optic is analyzed. The principle and test method of the system are given. The experiment and computer simulation prove that the acousto-optic deflecting technology can solve the problem of parallel random carrier signal and frequency resolution. The system performance and signal real-time processing effect have been greatly improved. The bandwidth reaches 300MHz and the frequency Resolution better than 1MHz. This method has the advantage of tracking and measuring precision of carrier frequency of random signal and can be applied to radar signal detection and photoelectric countermeasure.