双基地MIMO雷达实验系统校正与目标检测实验研究

发布时间：2018-04-20 14:10

本文选题：双基地MIMO雷达 + 实验系统　；参考：《电子科技大学》2014年硕士论文

【摘要】：双/多基地雷达采用收发分置的布阵方式,在现代电子战中表现出巨大的潜在优势;而集中式MIMO雷达通过发射相互正交的信号,极大提高了目标检测和参数估计等方面的能力。本文讨论的双基地MIMO雷达,将两者有机的结合起来,展示出更优良的性能和潜力;同时,由于其与现代雷达具有相似的系统结构,实用化显得更便捷。本文基于一套T/R-R体制的双基地MIMO雷达硬件实验系统,采用理论分析与实验研究相结合的方法,开展了该系统的模块调试、系统校正、功能测试和算法验证等工作,从而确保硬件系统在有效的控制逻辑下正常、稳定的工作;通过制定合理的外场实验方案,开展了一系列外场测试与实验,验证了MIMO雷达的性能特点及其目标探测能力等。具体工作内容包括以下几点:1、介绍了双基地MIMO雷达的基本原理和信号处理框架,以及几种目标信息提取的常用算法;讨论了发射信号非严格正交性对和差比幅单脉冲测角性能的影响,并提出了一种校正方法,可有效消除该影响。2、介绍了实验系统的逻辑结构、模块功能、工作流程和主要参数,完成了信号产生模块的功能测试;采用实测数据验证了发射信号分离的有效性,并对MIMO发射信号的正交性进行了实验验证。3、建立了收发阵列幅相误差、收发站间的频率差和相位差几种非理想因素下的信号模型,分析了非理想因素对信号处理算法的影响;采用有源校正技术实现了收发阵列幅相误差的校正,并利用MUSIC角度估计效果验证了该方法的有效性;借助于MTD处理方法实现了收发站间频率差的估计。同时,在校正方法成熟的基础上,制定了合理的实验方案,完成了实验系统发射方向图的绘制,验证了MIMO雷达等效发射波束形成原理,并通过远场信号采集与功率估计,验证了MIMO雷达的抗截获性能。4、为验证实验系统的目标检测功能,设计了合理的实验方法和实验场景,开展了MIMO雷达动目标检测实验;为改善目标检测效果,采用CLEAN算法实现了固定杂波的有效对消,该方法相比传统MTI方法,性能更优;此外,还开展了多目标检测实验,验证了MIMO雷达的多目标检测能力。
[Abstract]:The bistatic / multistatic radar has a great potential advantage in modern electronic warfare by using a transceiver and transceiver array, while the centralized MIMO radar can greatly improve the ability of target detection and parameter estimation by transmitting mutually orthogonal signals. The bistatic MIMO radar, which is discussed in this paper, combines both of them organically and shows better performance and potential. At the same time, because of its similar system structure with modern radar, the bistatic MIMO radar becomes more practical and convenient. Based on a bistatic MIMO radar hardware experimental system based on T/R-R system, this paper uses the method of combining theoretical analysis with experimental research to carry out the module debugging, system correction, function test and algorithm verification of the system. In order to ensure that the hardware system works normally and stably under effective control logic, a series of external field tests and experiments are carried out to verify the performance of MIMO radar and its target detection ability. The specific work includes the following points: 1, introduces the basic principle and signal processing framework of bistatic MIMO radar, as well as several common algorithms of target information extraction; This paper discusses the influence of non-strict orthogonality of transmitted signal on the angle measurement performance of sum difference ratio amplitude monopulse, and puts forward a correction method, which can effectively eliminate this influence. The logical structure, module function, work flow and main parameters of the experimental system are introduced. The functional test of the signal generation module is completed, the validity of the transmission signal separation is verified by the measured data, and the orthogonality of the MIMO transmission signal is verified experimentally. 3, and the amplitude and phase error of the transceiver array is established. The signal models of frequency difference and phase difference between transceiver stations are analyzed, the influence of non-ideal factors on signal processing algorithm is analyzed, and the amplitude and phase error correction of transceiver array is realized by using active correction technology. The effectiveness of this method is verified by MUSIC angle estimation, and the frequency difference between transceiver stations is estimated by MTD processing method. At the same time, on the basis of the mature correction method, a reasonable experimental scheme is established, and the transmission pattern of the experimental system is drawn up. The principle of equivalent beamforming of MIMO radar is verified, and the far-field signal acquisition and power estimation are carried out. The anti-interception performance of MIMO radar is verified. In order to verify the target detection function of the experimental system, a reasonable experimental method and experimental scene are designed, the moving target detection experiment of MIMO radar is carried out, and the effect of target detection is improved. The CLEAN algorithm is used to realize the efficient cancellation of fixed clutter, and the performance of this method is better than that of the traditional MTI method. In addition, the multi-target detection experiment is carried out to verify the multi-target detection ability of MIMO radar.
【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】：TN957.51

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