【摘要】：雷達系統(tǒng)仿真在雷達分析、設(shè)計與研制過程中發(fā)揮著日益重要的作用,以功能仿真和信號仿真為代表的雷達多分辨率建模方法受到重視,它可以為不同的仿真需求提供不同分辨率模型,從而在滿足多樣化仿真目的的前提下提升仿真效率。然而,不同分辨率雷達模型的一致性度量和一致性維護問題還缺乏深入研究。本文針對這一問題,分析雷達信號處理系統(tǒng)特點,建立其多分辨率模型,從行為和結(jié)構(gòu)兩方面對不同分辨率模型一致性進行量化分析,給出對應(yīng)的一致性度量方法。分析影響多分辨模型一致性的因素,以此來指導(dǎo)如何提高系統(tǒng)一致性,并為不同分辨率系統(tǒng)交互的一致性維護提供依據(jù)。最后,基于Matlab GUI進行了系統(tǒng)一致性仿真建模與驗證。本文主要工作概述如下:首先,根據(jù)多分辨率建模概念定義了雷達系統(tǒng)的功能仿真和信號仿真兩類分辨率模型,從結(jié)構(gòu)、I/O和分析三個層次給出一致性分析對象及度量方法。分析了兩個分辨率模型的一致性得到對應(yīng)的一致度:結(jié)構(gòu)上忽略了動目標(biāo)顯示模塊結(jié)構(gòu)一致度為0.9653;由于聚合過程丟失大量細節(jié)信息,因此與信號仿真I/O一致度不高,在0.8左右;分析一致性在輸出信噪比較低或目標(biāo)多普勒頻移在脈沖重復(fù)率整數(shù)倍附近時狀態(tài)不一致,分析一致度為0。其次,分析影響系統(tǒng)一致性的關(guān)鍵因素,提出可提高系統(tǒng)一致性的方法,依此由信號仿真聚合得到修正功能仿真模型,并分模塊分析了兩個分辨率系統(tǒng)各模塊的I/O一致性,一致度在0.99以上。從結(jié)構(gòu)一致性、I/O一致性和分析一致性三個層次分析兩個分辨率模型的一致度,可得修正功能仿真與信號仿真的一致性有較大提高,結(jié)構(gòu)一致度為1,I/O一致度在0.99以上,分析一致性在輸出信噪比高或低時都很高。再次,以信號仿真模型為參考,從I/O一致性出發(fā),通過分析信號處理過程中各模塊的輸入信息,得到不同分辨率系統(tǒng)的輸入信息差,以此維護系統(tǒng)聚合解聚過程中的一致性。給出功能仿真和信號仿真兩個分辨率模型的聚合解聚實現(xiàn)流程,并以動目標(biāo)顯示為例進行了多分辨率系統(tǒng)交互的仿真實現(xiàn)及一致性維護。最后,利用Matlab GUI實現(xiàn)了多分辨率雷達信號處理仿真平臺,通過人機交互界面實現(xiàn)參數(shù)的設(shè)置、仿真分辨率的選擇和仿真結(jié)果的顯示。并通過兩個分辨率系統(tǒng)的輸出分析了系統(tǒng)的分析一致性,多組測試結(jié)果下分析一致度為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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN957.51

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