毕业论文--雷达杂波的建模与仿真方法研究.docVIP

摘 要 现代雷达系统越来越复杂，难以用直观的方法来进行研究，因此雷达模拟应用广泛。雷达系统模拟是数字模拟技术与雷达技术结合地产物。也就是用计算机软件来建立雷达系统的模型，然后在计算机上复现雷达系统中信号的产生、传递、处理等动态工作过程。雷达模拟的核心是建立雷达目标回波信号及各种杂波信号散射、传播特性的模型。杂波伴随这雷达产生而产生，对于雷达的设计有着重要的影响。所以通过对杂波性质的研究，建立合适的模型，对于雷达设计和分析有重要意义。 对数正态分布、韦伯分布、K-分布是三种适于描述杂波的非高斯分布模型，快速、准确地模拟杂波对研究是十分重要的讨论了上述三种相关非高斯分布杂波的建模与仿真，在三种非高斯分布与高斯分布的相关系数之间的非线性关系的基础上，利用，模拟产生了三种相关的非高斯分布随机序列。仿真结果证明了这种方法是有效可靠的。 Abstract With the more complexity of modern radar system, it is difficult to analysis as usual methods. So Radar simulation is widely used. Radar System Simulation is combined with digital-analog techniques and radar technology. That is, Modeling radar system with software, and then recurring the produce, transmission processing by computer .The core of RES is modeling the scatter and transmission of radar echo signal and varied radar clutter signals. So it is very important to study the character of radar clutter, to find a proper model. And it is very sienificant to radar design and analysis. Radar clutter can be statistically modeled by using three kinds of non-Gaussian probability density functions (PDF) of lognormal, Weibull and K-distributed. It is important to correctly simulate radar clutter. Modeling and simulation of three kinds of correlated non-Gaussian clutter are discussed in is paper. Based on the correlation coefficient nonlinearity between three non-Gaussian and Gaussian distribution, three kinds of correlated non-Gaussian random sequences are generated by zeros memory nonlinearity (ZMNL). In the first part of the paper, the nature and classification of a radar clutter are discussed, and then we introduce several common probability density models, followed with the principle and application of ZMNL. In the end, we illuminate the simulated modeling way of Rayleigh, Log-norm, Weibull, K-distributed clutter with special power spectrum. All these models are used into the practical simulation of ground clutter, cloud-rain clutter and chaff jammer according to their features. The validity