雷达导引头多粒度建模与仿真

发布时间：2018-01-23 08:50

本文关键词： 多粒度建模信号级仿真功能级仿真子系统级仿真　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：从雷达导引头系统的应用考虑,开展雷达导引头系统多粒度建模研究具有十分重要的意义。针对不同的需求建立不同粒度的雷达导引头系统模型,能够有效地解决模型的复杂度与仿真速度之间的矛盾。本文针对雷达导引头系统通用框架,对多粒度建模在雷达导引头系统建模和仿真方面的应用作了研究。首先根据雷达导引头系统的层次化结构和多粒度建模方法,给出雷达导引头系统的三个粒度层次结构,将雷达导引头仿真系统从细粒度到粗粒度依次划分为:信号级仿真、子系统级仿真和功能级仿真,然后分别对信号级、子系统级和功能级仿真系统进行建模。信号级仿真属于细粒度模型,基于雷达导引头真实的信号处理流程进行仿真,逼真地复现从发射信号的产生、发射、空间传输、经过环境反射之后形成回波、接收、信号处理、数据处理以及控制导弹对目标进行跟踪制导的全过程。功能级仿真属于粗粒度模型,不仿真回波信号,而是通过参数和计算增益的方式对导引头系统进行整体功能的描述,利用雷达方程计算目标、噪声、杂波和干扰的回波功率,通过功率谱密度和频率响应函数得到信号处理模块对它们的功率增益,计算功率积累(相参、非相参)后的综合信噪比(Signal-to-Noise Ratio,SNR),基于该SNR对目标进行检测和测量,再进行数据处理和制导控制。在综合分析信号级和功能级仿真方法的基础上,给出了子系统级仿真模型。子系统级仿真的思路依然是通过得到目标、噪声、杂波和干扰的回波功率,计算信噪比,得到检测概率,进而判断是否检测到目标。子系统级仿真与功能级仿真的主要区别是对目标的处理方法,真实目标的回波功率是通过对信号级处理流程简化得到的。最后分别从行为层次和结构层次讨论不同粒度仿真模型的一致性,在相同的系统参数条件下给出不同粒度的仿真结果,通过仿真验证了不同粒度的仿真系统具有较好的一致性,同时不同粒度模型的对外接口也满足一致性;另外,从仿真时间对比这三个系统,子系统级仿真相比于信号级仿真系统,信号处理流程简单,仿真速度快;相比于功能级仿真系统,子系统仿真由于利用了真实目标的有效回波而更真实,但仿真速度会有所下降,仿真结果也证明子系统级仿真时间介于信号级和功能级仿真之间。
[Abstract]:Considering the application of radar seeker system, it is very important to study the multi-granularity modeling of radar seeker system. It can effectively solve the contradiction between the complexity of the model and the simulation speed. This paper aims at the general framework of radar seeker system. The application of multi-granularity modeling in radar seeker system modeling and simulation is studied. Firstly, according to the hierarchical structure and multi-granularity modeling method of radar seeker system. The three grained hierarchical structures of radar seeker system are presented. The simulation system of radar seeker is divided from fine granularity to coarse granularity into signal level simulation subsystem level simulation and function level simulation. Then the simulation system at signal level subsystem level and function level is modeled. Signal level simulation is a fine-grained model which is based on the real signal processing flow of radar seeker. Lifelike reproduction from the generation of transmitted signals, transmission, space transmission, after the environmental reflection to form echo, receive, signal processing. The function level simulation is a coarse-grained model and does not simulate the echo signal. The whole function of seeker system is described by parameter and gain, and the echo power of target, noise, clutter and interference is calculated by radar equation. The power gain of the signal processing module is obtained by power spectral density and frequency response function, and the power accumulation is calculated. Signal to noise ratio (Signal-to-Noise Ratio), based on which the target is detected and measured. Then data processing and guidance control are carried out. On the basis of synthetically analyzing the signal level and function level simulation methods, a subsystem level simulation model is given. The idea of subsystem level simulation is still to get the target and noise. The echo power of clutter and interference is calculated, the detection probability is obtained, and then the detection probability is determined. The main difference between subsystem level simulation and functional level simulation is the processing method of target. The echo power of the real target is obtained by simplifying the signal level processing flow. Finally, the consistency of different granularity simulation models is discussed from the behavior level and the structure level respectively. The simulation results of different granularity are given under the same system parameters. The simulation results show that the simulation system with different granularity has good consistency, and the external interface of different granularity model also meets the consistency. In addition, comparing these three systems from the simulation time, the subsystem level simulation is compared with the signal level simulation system, the signal processing process is simple and the simulation speed is fast; Compared with the functional level simulation system, the subsystem simulation is more real because of the effective echo of the real target, but the simulation speed will be decreased. The simulation results also show that the time of subsystem level simulation is between signal level and function level.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51

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