双基地雷达收发系统仿真研究

发布时间：2018-06-06 07:53

本文选题：双基地雷达 + 射频仿真　；参考：《电子科技大学》2014年硕士论文

【摘要】：雷达仿真技术是近几十年来发展起来的一门新兴雷达系统设计技术。随着新体制,多功能,高度集成,数字化雷达的设计开发,对雷达射频仿真设计也提出了更高的要求。雷达射频系统都是由很多子系统组合而成的,每个子系统都可以用物理或者数学模型加以描述。传统雷达射频系统的设计研发都是通过实验的方式进行,花费大量时间成本和人力成本。用计算机处理射频系统中的模型可以节约时间和成本得到一个结果,通过分析结果得知能够满足系统指标要求。本文研究和讨论了双基地雷达概念以及特点,由建立的坐标几何关系来推导雷达方程,描述了目标定位的原理;描述了机载双基地雷达的雷达方程推导过程,测绘带宽度、方位分辨率与收发天线的关系,脉冲重复频率的选择条件。文中通过对机载双基地雷达指标的分解,利用Advanced Design System(ADS)仿真软件对射频链路各个模块的仿真设计,对仿真模块中的锁相环(PLL)工作原理,低噪放(LNA)设计,直接频率合成技术(DDS)做了详细的介绍和分析。对射频仿真的谐波平衡法、有限元法、矩量法(MOM)、时域有限差分(FDTD)四种算法基本原理、方法及特点做了介绍。最后对射频分系统进行了电路设计仿真,对各个部分进行详细的仿真过程描述,对仿真的结果做出分析,对整个收发链路进行整体的混合仿真,验证信号经过该设计的收发信道对信号参数的影响。设计了一个基于用MATLAB软件图形用户界面(GUI)功能的参数设置及信号处理的界面,得到线性调频信号(LFM)通过射频系统的数据,通过分析处理实际的数据,对比仿真设计和实际电路,找出系统仿真设计和测试系统的不足,找到未来需要优化和完善设计的地方。
[Abstract]:Radar simulation technology is a new radar system design technology developed in recent decades. With the new system, multi-function, high integration, digital radar design and development, the radar RF simulation design also put forward higher requirements. Radar RF systems are composed of many subsystems, each of which can be described by physical or mathematical models. The design and development of traditional radar RF system are carried out through experiments, which cost a lot of time and manpower. Using computer to process the model in RF system can save time and cost to get a result. The result shows that it can meet the requirement of system index. In this paper, the concept and characteristics of bistatic radar are studied and discussed, the radar equation is derived from the coordinate geometric relation established, the principle of target positioning is described, the radar equation derivation process of airborne bistatic radar is described, and the width of the surveying band is described. The relationship between azimuth resolution and transceiver antenna, the selection condition of pulse repetition frequency. Based on the decomposition of airborne bistatic radar index, the simulation design of each module of RF link using Advanced Design system ads software, the working principle of PLL in the simulation module and the design of low noise amplifier (LNA) are presented in this paper. Direct Frequency Synthesis (DDS) is introduced and analyzed in detail. The basic principles, methods and characteristics of harmonic balance method, finite element method, moment method and FDTD algorithm for RF simulation are introduced. At last, the circuit design of RF subsystem is simulated, the simulation process is described in detail, the simulation results are analyzed, and the whole transceiver link is simulated. The effect of the designed transceiver channel on the signal parameters is verified. A parameter setting and signal processing interface based on the graphical user interface (GUI) of MATLAB software is designed. The data of LFM are obtained through RF system, and the actual data are analyzed and processed, and the simulation design and actual circuit are compared. Find out the deficiency of the system simulation design and test system, find the place that needs to optimize and perfect the design in the future.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957

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