共查询到19条相似文献,搜索用时 812 毫秒
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线性调频宽带PD雷达的数字IQ处理方法研究 总被引:1,自引:0,他引:1
建立了宽带PD雷达信号处理过程的数学模型,提出了高重频宽带线性调频脉冲多卜勒雷达信号的波形设计要求,以及一种单通道低采样率数字IQ处理方法。理论分析与仿真结果表明,该方法相对于传统脉冲多卜勒雷达所采用的高采样率单通道直接中频采样IQ处理方法具有更好的信号能量积累性能。 相似文献
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宽带微波功率放大器在雷达和电子对抗中的应用越来越广泛,而宽带微波功率放大器的设计在国内还处于起
步阶段。本文采用实频技术方法和负载线仿真的方法设计了输入输出匹配电路,并使用先进的微波电路设计软件ADS 对电
路进行了优化和仿真,最终设计出一款X 波段宽带微波功率放大器。 相似文献
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对复杂动态目标进行回波建模是研究目标散射特性,实现雷达跟踪识别动态目标的重要基础。该文利用宽带雷达的高分辨特性,分析了宽带信号照射到运动点目标上的回波信号形式,根据高频区目标总的电磁散射是多散射中心的合成的原理,得出了宽带雷达动态复杂目标的回波模型,并针对冲击雷达信号运用该模型进行回波仿真,获得给定目标在平动及转动情况下的回波仿真信号。仿真结果较好地反映出目标特征,为进一步进行雷达目标的识别提供了理论分析依据。 相似文献
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王龙潘明海宋聂 《数据采集与处理》2016,31(4):823-831
为了实现宽带雷达系统中雷达信
号的低失真采集与处理,研究并设计了具有幅相误差校正功能的宽带低杂散采样系统。该系统采用宽带模数转换(Analog to digital converter, ADC)器件和高性能可编程逻辑阵列(Field programmable gate array, FPGA)的实现方案,并从低抖动采样时钟、低噪声电源和防串扰等方面进行了低杂散最优方案研究。为了改善系统的带内传输特性,利用优化算
法设计了有限长冲激响(Finite impulse response,FIR)数字校准滤波器。最后对设计
的系统进行实验测试,结果表明系统瞬时带宽达到800 MHz以上,采样率1.8GS/s,量化位数8位、杂散电平-50 dBc,性能指标满足系统在宽带雷达信号获取、宽带雷达目标成像和宽带雷达目标回波重构等领域的应用。 相似文献
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用扫频方法测量了缩比模型的低频宽带雷达散射截面,通过变换得到大尺寸导体目标的低频宽带RCS;并利用时域有限差分方法对全尺寸导体目标的雷达散射截面进行仿真计算,也得到了大尺寸的导体目标的低频宽带RCS;结果表明了这两种方法的一致性,为获得大尺寸导体目标的低频宽带散射特性提供了可以信赖的手段. 相似文献
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轨道目标ISAR中频回波模拟技术研究 总被引:1,自引:0,他引:1
该文目的是研究一种空间目标宽带ISAR雷达回波的模拟实现方法,为空间目标探测雷达的研制及空间目标特性的研究提供信号来源。该文首先深入研究了空间目标的运动特性,给出了弹道目标轨道方程的计算方法,由目标的轨迹可以确定任意时刻目标的姿态,从而得到目标的散射中心分布。然后分析了目标在大时宽带宽雷达照射下的回波信号特性,结合目标轨道计算提供的散射中心分布信息,模拟出目标的中频回波信号。最后,提出了一种轨道目标ISAR雷达回波模拟器的实现方案,给出了实验结果。在实际应用中证明,用该方法模拟空间目标宽带雷达回波完全可行。 相似文献
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幅相特性对于雷达非常重要,直接影响雷达的跟踪性能,嵌入式雷达幅相特性测试仪,采用嵌入式Linux操作系统,以PC/104总线CPU模块为核心,配以幅相特性测试虚拟仪器卡和测试软件构成;该测试仪能完成多种雷达天线馈电线系统、接收系统宽带微波信号幅度差与相位差测试的自动引导,在测试精度、测试方法、操作使用等方面都优于以前的仪器,该测试仪在雷达BIT整机性能监测系统中得到了应用,显著改善了雷达的测试性。 相似文献
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由于受到发射机功率和天线孔径的限制,地基空间目标探测雷达一般采用脉冲积累增程技术对高轨空间目标进行探测.针对脉冲积累条件下,空间目标的雷达散射截面(RCS)特性和轨道特性在目标识别和身份确认等方面存在的缺陷,提出了一种基于分段相参处理的高轨空间目标宽带一维像特征提取方法,利用模拟同步轨道目标数据,成功获取了高分辨率宽带一维距离像.实验结果表明,不同目标的宽带一维像具有显著差异性,而同一目标不同时刻具有明显一致性.该技术可为高轨空间目标尺寸估计、个体确认和状态判别提供有力支撑. 相似文献
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极化测量技术是现代雷达领域的重要发展趋势之一,对目标极化特性的测量是实现极化雷达的关键技术,但在工程实现上存在很大的技术挑战.针对这种情况,提出了一种新体制目标特性测量雷达的理论模型,即正交极化二元阵.初步证明了该式天线具有明显的极化空变特性,进而设计了一种新的极化测量处理算法,仅需一个接收处理通道即可在天线波束扫掠目标时,实现目标极化散射矩阵的测量.通过紧凑场微波暗室对自行搭建的正交极化二元阵进行了全极化宽带动态测量实验,利用实测数据处理验证了上述研究的正确性.研究结果对于挖掘现有雷达装备的极化测量潜力,提升其信息获取与处理能力,具有一定的启发意义. 相似文献
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《中国科学:信息科学(英文版)》2012,(10):2301-2317
Sparse microwave imaging radar is a newly developed concept of microwave imaging system,which tries to combine the traditional radar imaging system with sparse signal processing theories,achieving the aim of reducing the complexity of microwave imaging systems and enhancing the system performance.In this paper,we introduce some basic concepts of sparse signal processing theory,and then apply it to the traditional radar imaging system to get the mathematical model of sparse microwave imaging system.We analyze the factors that determine the performance of sparse microwave imaging radar,including scene,waveform and platform.According to the radar model,we analyze how these factors influence the radar system and how to optimize them.Simulation results of the sparse microwave imaging radar system are also provided. 相似文献
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《中国科学:信息科学(英文版)》2012,(8):1722-1754
This paper provides principles and applications of the sparse microwave imaging theory and technology.Synthetic aperture radar(SAR) is an important method of modern remote sensing.During decades microwave imaging technology has achieved remarkable progress in the system performance of microwave imaging technology,and at the same time encountered increasing complexity in system implementation.The sparse microwave imaging introduces the sparse signal processing theory to radar imaging to obtain new theory,new system and new methodology of microwave imaging.Based on classical SAR imaging model and fundamental theories of sparse signal processing,we can derive the model of sparse microwave imaging,which is a sparse measurement and recovery problem and can be solved with various algorithms.There exist several fundamental points that must be considered in the efforts of applying sparse signal processing to radar imaging,including sparse representation,measurement matrix construction,unambiguity reconstruction and performance evaluation.Based on these considerations,the sparse signal processing could be successfully applied to radar imaging,and achieve benefits in several aspects,including improvement of image quality,reduction of data amount for sparse scene and enhancement of system performance.The sparse signal processing has also been applied in several specific radar imaging applications. 相似文献
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信号源是雷达发射机与接收机的关键组成部分,其性能直接影响着雷达的探测能力。基于电子技术的信号产生在信号载频、带宽以及噪声等特性方面受到限制,难以满足未来高性能雷达对高载频、大带宽、低噪声信号源的需求。新兴的微波光子技术能利用光子学手段产生高质量微波信号,在雷达信号产生领域具有广阔的应用前景。本文主要介绍利用微波光子技术产生雷达信号的研究进展,包括基于光电振荡器的高性能本振信号产生、线性调频信号产生和相位编码信号产生。通过对以上技术的分析发现,基于微波光子技术的微波信号产生具有带宽大、抗干扰等突出优点,是解决当前雷达信号产生技术瓶颈的有效手段。 相似文献
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Seongkeun Park Jae Pil Hwang Euntai Kim Hyung-Jin Kang 《Control Engineering Practice》2010,18(4):383-395
In this paper, a probabilistic target vehicle tracking method is proposed for situation awareness of intelligent cruise control (ICC) vehicle. The ICC vehicle considered herein is equipped with a 24 GHz microwave radar for tracking the preceding vehicle. To overcome the severe dispersion and noise of the microwave radar, a statistical model for the radar is built and it is applied to the hybrid particle filter. The hybrid particle filter is combined with the interacting multiple models (IMM) to track the preceding vehicle and predict the driver's intention. Furthermore, the modified hybrid particle filter is proposed to cope with the missing or multiple measurements of the microwave radar. Finally, a computer simulation is conducted and the validity of the proposed method is demonstrated. 相似文献
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I. H. Woodhouse 《International journal of remote sensing》2013,34(15):2901-2913
As active microwave instruments become more advanced and the application of radar images more prolific there is an ever present need for a wider audience to appreciate the workings and subtleties of radar remote sensing systems. Many problems associated with the use and interpretation of such data are a consequence of users failing to properly conceptualise the radar system and the manner in which it gathers information about the target. This paper attempts to provide a conceptual framework for radar systems based on an auditory perception analogy that should allow for a clearer appreciation of the subtle differences between passive optical and active microwave systems. Through a comparison between how eyes and ears function, and by looking at their very different means of gathering information, a few of the difficult concepts that are important in gaining a deeper understanding of radar image production are discussed. 相似文献
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