【作者】 潘楚琳；

【导师】 齐国清；

【作者基本信息】 大连海事大学 ， 通信与信息系统， 2003， 硕士

【摘要】 研究了雷达回波视频信号的实时模拟方法。目的在于能够模拟产生出符合导航雷达实际工作环境的雷达回波视频信号。其主要用途是为ARPA和VTS系统研究、实验、教学和专业人员培训提供雷达回波信号源。 对雷达目标(即船舶)和雷达工作环境建立了数学模型。目标模型包括船舶的距离、方位、速度和回波幅度、幅度起伏。距离、方位、速度是用矢量方法来确定的。回波幅度主要由船舶的雷达截面积来决定。回波幅度起伏是用斯威尔林统计模型来描述。环境模型包括机内噪声、海浪杂波、雨雪杂波、同频干扰、虚假目标等杂波模型。机内噪声是高斯白噪声。海浪杂波和雨雪杂波属于平稳随机过程：其幅度分布服从特定的统计规律；其具有特定的功率谱。本文提出了一种将随机序列通过数字功率谱处理滤波器，从而产生雷达杂波的方法。其中，功率谱处理滤波器是运用谱估计手段来设计的。本文还提出一种通过对截短的高斯白噪声序列进行二维FFT，结果产生具有很强的二维相关性的雷达杂波的方法。这种方法可以用来模拟雷达虚假目标回波。 根据确定的数学模型，设计了计算机模拟生成各种回波数据的算法。在Windows平台上使用VC++6.0语言作为开发工具编写了名为《雷达回波视频信号数据生成系统》的计算机软件。该软件实现了上述算法，能够运算生成雷达回波视频信号数据。同时，该软件应用了计算机图像处理技术和多线程编程技术，能够根据所产生的数据动态地仿真生成雷达接收机视频图像。更多还原

【Abstract】 The purpose of the research is to simulate the radar echo signal in real-time, which is in agreement with the actual navigation radar operating-environment characteristic and provided for ARP7A&VTS systems.The mathematical model of radar target and operating-environment is presented. The model of radar target is composed of distance, bearing, speed, heading and amplitude of echo, fluctuation. The distance, bearing, speed and heading are defined by the method of vector. The radar echo amplitude is mainly determined on the radar cross section. The fluctuation of the radar echo is illustrated by the Swelling’ model I. The mathematical model of the radar operating-environment is composed of sea-clutter, rain-clutter, thermal noise, false target and interference signal from another radar operating at the same band etc. The thermal noise is generally modeled as a white Gaussian noise (WGN). The sea-clutter and rain-clutter are modeled as a stable stochastic process with a certain amplitude distribution and a kind of power spectral type. A method has been proposed to make the stochastic sequence correlated by passing it into a low-pass filter, which is based on an estimation of spectrum. It has been realized to simulate the correlated radar clutter by applying the above method. In addition, another method has been given to simulate the false target, which is based on the two-dimensional FFT. The correctness and practicality of this method are proved by the simulation result.According to the mathematical model, some algorithms have been designed for simulating the radar echo data. The software of simulation has been realized with Visual C++, the function of which is to produce the radar echo data and create the simulated image of radar video in real-time. The multi-thread program technique and computer-image processing have been involved in the software. The results of simulation show the applicability and effectiveness of the mathematical model and the software.更多还原