本文關鍵詞： 多粒度建模 信號級仿真 功能級仿真 子系統(tǒng)級仿真　出處：《西安電子科技大學》2014年碩士論文　論文類型：學位論文

【摘要】：從雷達導引頭系統(tǒng)的應用考慮,開展雷達導引頭系統(tǒng)多粒度建模研究具有十分重要的意義。針對不同的需求建立不同粒度的雷達導引頭系統(tǒng)模型,能夠有效地解決模型的復雜度與仿真速度之間的矛盾。本文針對雷達導引頭系統(tǒng)通用框架,對多粒度建模在雷達導引頭系統(tǒng)建模和仿真方面的應用作了研究。首先根據(jù)雷達導引頭系統(tǒng)的層次化結構和多粒度建模方法,給出雷達導引頭系統(tǒng)的三個粒度層次結構,將雷達導引頭仿真系統(tǒng)從細粒度到粗粒度依次劃分為:信號級仿真、子系統(tǒng)級仿真和功能級仿真,然后分別對信號級、子系統(tǒng)級和功能級仿真系統(tǒng)進行建模。信號級仿真屬于細粒度模型,基于雷達導引頭真實的信號處理流程進行仿真,逼真地復現(xiàn)從發(fā)射信號的產生、發(fā)射、空間傳輸、經(jīng)過環(huán)境反射之后形成回波、接收、信號處理、數(shù)據(jù)處理以及控制導彈對目標進行跟蹤制導的全過程。功能級仿真屬于粗粒度模型,不仿真回波信號,而是通過參數(shù)和計算增益的方式對導引頭系統(tǒng)進行整體功能的描述,利用雷達方程計算目標、噪聲、雜波和干擾的回波功率,通過功率譜密度和頻率響應函數(shù)得到信號處理模塊對它們的功率增益,計算功率積累(相參、非相參)后的綜合信噪比(Signal-to-Noise Ratio,SNR),基于該SNR對目標進行檢測和測量,再進行數(shù)據(jù)處理和制導控制。在綜合分析信號級和功能級仿真方法的基礎上,給出了子系統(tǒng)級仿真模型。子系統(tǒng)級仿真的思路依然是通過得到目標、噪聲、雜波和干擾的回波功率,計算信噪比,得到檢測概率,進而判斷是否檢測到目標。子系統(tǒng)級仿真與功能級仿真的主要區(qū)別是對目標的處理方法,真實目標的回波功率是通過對信號級處理流程簡化得到的。最后分別從行為層次和結構層次討論不同粒度仿真模型的一致性,在相同的系統(tǒng)參數(shù)條件下給出不同粒度的仿真結果,通過仿真驗證了不同粒度的仿真系統(tǒng)具有較好的一致性,同時不同粒度模型的對外接口也滿足一致性;另外,從仿真時間對比這三個系統(tǒng),子系統(tǒng)級仿真相比于信號級仿真系統(tǒng),信號處理流程簡單,仿真速度快;相比于功能級仿真系統(tǒng),子系統(tǒng)仿真由于利用了真實目標的有效回波而更真實,但仿真速度會有所下降,仿真結果也證明子系統(tǒng)級仿真時間介于信號級和功能級仿真之間。
[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.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN957.51

【參考文獻】

相關期刊論文 前1條

1 楊蕾;王曉楠;徐洪林;;中近程防空導彈武器系統(tǒng)中復合制導雷達技術研究[J];艦船電子對抗;2011年05期

，

本文編號：1457223