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利用系统仿真工具对舰载雷达信号检测系统建模与仿真,可以经济、高效、快捷地对它的检测性能进行全面客观地综合评判。文中给出了如何利用蒙特卡洛(Monte-Carlo,简称MC)法来近似地描述研究对象的概率分布的一般方法。在此基础上,详细地介绍了如何利用蒙特卡洛法对舰载雷达信号检测系统进行建模与仿真,模拟出目标信号加海杂波的随机序列,同时给出了形状参数已知的Weibull分布海杂波背景下系统的仿真结果。该文提供的方法为研究海杂波背景下雷达系统的信号检测性能提供了灵活的试验平台。 相似文献
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为适应时变乃至模型未知的复杂环境,S.Haykin等提出了一种基于神经网络模式识别的雷达目标检测方法.作者在深入研究该检测系统中主要模块:用作分类器的MLP网络和用作特征提取的PCA网络的局限性后,提出分别运用模糊神经网络与Kohonen神经网络对其检测系统进行改进重构.本文主要介绍基于Kohonen网络特征提取的检测方法,并分别运用模拟与真实数据,与原PCA方法进行了性能比较实验与分析. 相似文献
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为解决战略预警雷达、舰载一体化等重点型号雷达中高速数字电路模块的维护能力,设计了基于VPX总线的高速数字电路自动测试系统,通过自研基于VPX总线的多功能测试模块、光纤测试模块,以及通用VPX背板,再结合通用的仪器设备构建测试系统,可兼顾多个型号雷达高速数字电路模块的测试;该系统可提供10路光纤通道,波特率最高为3.2 Gbps;16路GPIO信号,中断响应时间<50 μs;14路Rocket IO信号,传输速率2.5 Gbps;4路*4Rapid IO信号,传输速率3.125 Gbps;研究及实测结果表明该系统可解决基于VPX总线的高速数字电路模块的测试。 相似文献
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ADS-B系统是一种新型的空域监视技术,在处理空中交通信息时具有准确性、可靠性和及时性的特点,逐渐成为了主流的监视手段.为目前检测雷达战术性能缺乏调度,测试环境复杂多变的问题带提供了新的解决思路.通过分析ADS-B的技术特点和雷达战术性能测试的需求,提出基于ADS-B的目标指示雷达战术性能测试系统的总体技术方案,并对其关键技术进行阐述.该系统通过接收民航系统飞机广播的高精度目标参数,为雷达测试提供精确的测量对比数据,检验被测雷达的战术性能. 相似文献
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利用现代最新发展的大规模集成电路技术和数字处理技术,设计基于现场可编程门阵列(FPGA)的雷达目标检测信号处理系统。对该信号处理系统的快速傅立叶变换、单元平均恒虚警(CFAR)检测用FPGA进行了专用集成电路设计。仿真试验证实该系统性能稳定、抗干扰能力强、体积小、便于调试。 相似文献
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孙亚芬 《自动化技术与应用》2007,26(2):42-44,53
通过对雷达信号处理系统的研究,对雷达在杂波环境下的低速目标检测能力进行了分析,提出了基于杂波频移补偿、MTI滤波及CFAR的信号处理思路,为针对进一步提出改善其目标检测能力的方法奠定了基础. 相似文献
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Roberto Perez-Andrade René Cumplido Claudia Feregrino-Uribe Fernando Martin Del Campo 《Digital Signal Processing》2010,20(6):1733-1747
Constant False Alarm Rate (CFAR) algorithms are used in digital signal processing applications to extract targets from background in noisy environments. Some examples of applications are target detection in radar environments, image processing, medical engineering, power quality analysis, features detection in satellite images, Pseudo-Noise (PN) code detectors, among others. This paper presents a versatile hardware architecture that implements six variants of the CFAR algorithm based on linear and nonlinear operations for radar applications. Since some implemented CFAR algorithms require sorting the input samples, a linear sorter based on a First In First Out (FIFO) schema is used. The proposed architecture, known as CFAR processor, can be used as a specialized module or co-processor for Software Defined Radar (SDR) applications. The results of implementing the CFAR processor on a Field Programmable Gate Array (FPGA) are presented and discussed. 相似文献
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对雷达信号处理的仿真建模方法进行研究,利用SystemVue仿真平台中专用的雷达模型库构建雷达系统仿真模型,并对杂波环境下的雷达信号处理过程进行雷达系统的建模与仿真实现。首先,分析雷达回波生成过程及雷达信号处理的基本原理;其次,研究雷达仿真模型库中目标模型、杂波/噪声模型、脉冲压缩模型、MTD模型、CFAR模型的功能作用及参数设置;最后,利用SystemVue仿真平台搭建杂波环境下雷达系统仿真模型,并基于矩阵类型的数据对雷达信号处理过程进行仿真。经过仿真,雷达系统模型的信号处理结果与理论相符,验证了该仿真模型的正确性。 相似文献
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恒虚警处理技术(CFAR),是用来在杂波环境变化的时候维持雷达虚警概率基本不变。当高分辨率雷达在低视角观察的海杂波或者地杂波背景中进行检测时,目标就是包含在非瑞利杂波中。最常用的描述非瑞利包络杂波的统计模型是Weibull分布模型。通过matlab仿真平台,分别对有无目标的Weibull分布杂波环境进行最大选择恒虚警(G0—CFAR)处理,依此研究其有效性。 相似文献
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Ren-li Zhang Wei-xing Sheng Xiao-feng Ma Yu-bing Han 《Digital Signal Processing》2013,23(6):1974-1988
In order to improve the detection performance of constant false alarm rate (CFAR) detectors in multiple targets situations, a CFAR detector based on the maximal reference cell (MRC) named MRC-CFAR is proposed. In MRC-CFAR, a comparison threshold is generated by multiplying the amplitude of MRC by a scaling factor. The number of the reference cells left, whose amplitudes are smaller than the comparison threshold, is counted and compared with a threshold integer. Based on the comparison result, proper reference cells are selected for detection threshold computation. A closed-form analysis for MRC-CFAR in both homogeneous and non-homogeneous environments is presented. The performance of MRC-CFAR is evaluated and compared with other CFAR detectors. MRC-CFAR exhibits a very low CFAR loss in a homogeneous environment and performs robustly during clutter power transitions. In multiple targets situations, MRC-CFAR achieves a much better detection performance than switching CFAR (S-CFAR) and order-statistic CFAR (OS-CFAR). Experiment results from an X-band linear frequency modulated continuous wave radar system are given to demonstrate the efficiency of MRC-CFAR. Because ranking reference cells is not required for MRC-CFAR, the computation load of MRC-CFAR is low; it is easy to implement the detector in radar system in practice. 相似文献
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雷达恒虚警检测系统仿真 总被引:4,自引:0,他引:4
恒虚警(CFAR)处理技术对常采用机载下视或类似工作条件的PD雷达进行目标检测非常重要,文章首先对恒虚警检测原理进行论述,重点讨论单元平均CA-CFAR,最大选择GO(greatest of)-CFAR和最小选择SO(smallest of)-CFAR这三种均值类恒虚警处理方法,建立其数学模型.接下来对接收机噪声信号进行模拟,同时建立目标信号模型,并将所产生的噪声信号与目标信号相叠加仿真雷达系统的接收信号,注入所建立的恒虚警模型中进行检测仿真,给出仿真结果的分析,试验证明了仿真系统的有效性. 相似文献
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Target detection in clutter is a fundamental problem in radar signal processing. When the received radar signal contains only few pulses, it is difficult to achieve a satisfactory performance using the traditional detection algorithm. In recent times, a generalized constant false alarm rate (CFAR) detector on the Riemannian manifold of Hermitian positive-definite (HPD) matrix was proposed. The employment of this detector, which compares the Riemannian distance between the covariance matrix of the cell under test (CUT) and an average matrix of reference cells with a given threshold, has significantly improved the detection performance. However, the application of this detector in real scenarios is still limited by two problems; it is computationally expensive and the detection performance is not very good since the Riemannian distance is utilized. In this paper, the symmetrized Kullback–Leibler (sKL) and the total Kullback–Leibler (tKL) divergences, instead of the Riemannian distance, are used as dissimilarity measures in the matrix CFAR detector. According to sKL and tKL divergences, three average matrices, the sKL mean, the sKL median, and the tKL t center, are derived. Furthermore, the relationship between the detection performance and the anisotropy of the distance measure used in the matrix CFAR detector is explored. Numerical experiments and real radar sea clutter data are given to confirm the superiority of the proposed algorithms in terms of the computational complexity and the detection performance. 相似文献
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针对导航卫星信号监测的新要求,提出一种集成了数据采集、处理、存储和回放功能的一体化卫星信号采集系统。该系统采用PCIe架构,系统带宽可达到全双工900MB;数据采集480MB持续数据,以及480MB突发数据;数据处理采用FPGA+DSP联合架构,完成对数据实时处理;存储采用全固态结构,用Flash代替传统的磁盘存储;并且能够通过PCIe接口完成960MB带宽的数据回放。该系统具有性能高、集成度高的优点,可以运用在雷达、侦查等高端领域。 相似文献