雷达信号处理系统多分辨率建模与仿真研究

发布时间：2018-08-16 19:44

【摘要】：雷达系统仿真在雷达分析、设计与研制过程中发挥着日益重要的作用,以功能仿真和信号仿真为代表的雷达多分辨率建模方法受到重视,它可以为不同的仿真需求提供不同分辨率模型,从而在满足多样化仿真目的的前提下提升仿真效率。然而,不同分辨率雷达模型的一致性度量和一致性维护问题还缺乏深入研究。本文针对这一问题,分析雷达信号处理系统特点,建立其多分辨率模型,从行为和结构两方面对不同分辨率模型一致性进行量化分析,给出对应的一致性度量方法。分析影响多分辨模型一致性的因素,以此来指导如何提高系统一致性,并为不同分辨率系统交互的一致性维护提供依据。最后,基于Matlab GUI进行了系统一致性仿真建模与验证。本文主要工作概述如下:首先,根据多分辨率建模概念定义了雷达系统的功能仿真和信号仿真两类分辨率模型,从结构、I/O和分析三个层次给出一致性分析对象及度量方法。分析了两个分辨率模型的一致性得到对应的一致度:结构上忽略了动目标显示模块结构一致度为0.9653;由于聚合过程丢失大量细节信息,因此与信号仿真I/O一致度不高,在0.8左右;分析一致性在输出信噪比较低或目标多普勒频移在脉冲重复率整数倍附近时状态不一致,分析一致度为0。其次,分析影响系统一致性的关键因素,提出可提高系统一致性的方法,依此由信号仿真聚合得到修正功能仿真模型,并分模块分析了两个分辨率系统各模块的I/O一致性,一致度在0.99以上。从结构一致性、I/O一致性和分析一致性三个层次分析两个分辨率模型的一致度,可得修正功能仿真与信号仿真的一致性有较大提高,结构一致度为1,I/O一致度在0.99以上,分析一致性在输出信噪比高或低时都很高。再次,以信号仿真模型为参考,从I/O一致性出发,通过分析信号处理过程中各模块的输入信息,得到不同分辨率系统的输入信息差,以此维护系统聚合解聚过程中的一致性。给出功能仿真和信号仿真两个分辨率模型的聚合解聚实现流程,并以动目标显示为例进行了多分辨率系统交互的仿真实现及一致性维护。最后,利用Matlab GUI实现了多分辨率雷达信号处理仿真平台,通过人机交互界面实现参数的设置、仿真分辨率的选择和仿真结果的显示。并通过两个分辨率系统的输出分析了系统的分析一致性,多组测试结果下分析一致度为0.9616。
[Abstract]:Radar system simulation plays an increasingly important role in radar analysis, design and development. It can provide different resolution models for different simulation requirements, so as to improve the efficiency of simulation. However, the consistency measurement and consistency maintenance of radar models with different resolution are not well studied. Aiming at this problem, this paper analyzes the characteristics of radar signal processing system, establishes its multi-resolution model, quantifies the consistency of different resolution models from two aspects of behavior and structure, and gives the corresponding consistency measurement method. The factors influencing the consistency of the multi-resolution model are analyzed to guide how to improve the consistency of the system and to provide the basis for the consistency maintenance of the system with different resolution. Finally, the system consistency simulation modeling and verification based on Matlab GUI are carried out. The main work of this paper is summarized as follows: firstly, according to the concept of multi-resolution modeling, two kinds of resolution models of radar system are defined, and the consistency analysis object and measurement method are given from the three levels of structure / I / O and analysis. The consistency of the two resolution models is analyzed. The structural consistency of the moving-target display module is 0.9653, because the aggregation process loses a lot of detail information, the consistency degree with the signal simulation I / O is not high (about 0.8). When the output signal-to-noise ratio is low or the Doppler frequency shift of the target is near the pulse repetition rate, the state of analysis consistency is inconsistent, and the degree of analysis consistency is 0. Secondly, the key factors affecting system consistency are analyzed, and a method to improve system consistency is proposed. According to this, the modified functional simulation model is obtained by signal simulation aggregation, and the I / O consistency of each module of the two resolution systems is analyzed in sub-modules. The consistency is above 0.99. By analyzing the consistency degree of the two resolution models from the three levels of structure consistency and analysis consistency, it is found that the consistency between the modified functional simulation and the signal simulation is greatly improved, and the structural consistency is over 0.99. The analysis consistency is very high when the output signal-to-noise ratio is high or low. Thirdly, by analyzing the input information of each module in the process of signal processing, the difference of input information of different resolution system is obtained from the reference of signal simulation model and I / O consistency, so as to maintain the consistency in the process of aggregation and depolymerization of the system. The process of aggregate depolymerization of two resolution models, functional simulation and signal simulation, is presented, and the simulation and consistency maintenance of multi-resolution system interaction is carried out by taking moving target display as an example. Finally, the multi-resolution radar signal processing simulation platform is implemented by using Matlab GUI. The parameters setting, the selection of simulation resolution and the display of simulation results are realized through man-machine interface. The analysis consistency of the system is analyzed by the output of the two resolution systems. The analysis consistency degree is 0.9616 under the multi-group test results.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN957.51

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