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针对低轨星座系统间同频干扰问题,从信号分割角度,提出了基于单通道盲源分离的干扰减缓方法。该方法应用了单通道盲源分离算法,先通过奇异谱分析算法对地球站观测信号进行处理,构造多维轨迹矩阵;再利用快速固定点算法将干扰信号和受扰信号分离。以OneWeb和Starlink系统为例,通过所提方法将OneWeb地球站接收到的OneWeb、Starlink以及噪声的混合信号进行分解,并利用相关系数和均方根误差评估了方法的有效性。结果表明,原始信号与分离信号之间的相关系数都在0.8以上,所提方法能有效提取有用信号,减缓低轨星座系统间干扰。 相似文献
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针对大功率干扰下的分布式多站雷达探测能力下降的问题,本文提出了一种新的基于盲源分离的干扰抑制方法。该方法对多部雷达接收信号进行信号级和数据级的联合处理,包括干扰相对时延估计及补偿-盲源分离-多组合配对定位三个步骤。首先分别以不同接收回波信号为参考,采用相关法估计各站点干扰信号相对时延,并进行补偿使干扰成分得到校准。然后针对校准后的信号,采用盲源分离算法,实现干扰信号和目标回波信号分离。最后,利用多组合配对定位方法,剔除由于盲源分离得到的虚假目标定位点,从而得到真实目标位置信息。最后本文通过仿真实验证明了该算法的有效性。 相似文献
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提出一种基于循环平稳差异的直扩信号盲提取抗干扰方法.针对源信号在统计域上的近似独立性,构建直扩通信盲源分离抗干扰模型,基于源信号的循环平稳差异,利用循环自相关函数的典型极值点定义一个用于区分直扩信号和干扰的二阶循环差异度特征参数,通过比较该特征参数的大小进行模式识别,提取出直扩信号而抑制掉干扰,达到抗干扰的目的.仿真结果表明:当信干比(SJR)为-40dB、归一化信噪比(NSNR)为9dB时,直接解扩/解调信号的误比特率约为IE-0.3,而本文所提抗干扰算法误比特率(BER)低至IE-3,可从强干扰中有效分离并提取出直扩信号. 相似文献
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一种新的LFM引信距离欺骗干扰抑制算法 总被引:2,自引:0,他引:2
针对线性调频(LFM)引信距离欺骗干扰问题,研究了一种结合随机调斜率和盲分离(BSS)的干扰抑制方法。该方法采用区别对待机制,首先采用随机调斜率,使敌方不易获取引信信号关键参数,从而可以通过简单的匹配滤波方法进行抗干扰。在随机调斜率失效的情况下再采用盲分离算法分离回波和干扰,然后根据频谱的连续性原理获取完整分离信号,最后根据数字射频存储(DRFM)相位量化的特性来区分回波和干扰。实验仿真表明,在干扰信号调斜率达到4%误差以上时随机调斜抗干扰具有很好的效果,且算法中很少(小于10%)会采第二种盲分离算法,因而运算量大为降低,可为引信抗欺骗干扰提供重要的实际参考。 相似文献
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自雷达诞生以来,抗干扰能力一直是评价一部雷达性能的关键性指标,特别是随着战场电磁环境的日益复杂,雷达抗干扰问题变得尤其重要。针对抗压制性干扰,改进了传统意义上基于最大信噪比的盲源分离算法,提出了使用干扰重构算法取代滑动平均处理的方法,获得了比传统方法分离出质量更高的雷达信号,输出信号与源信号相关性更强。 相似文献
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基于盲源分离的同道数字通信干扰抑制 总被引:2,自引:0,他引:2
教字通信方式广泛应用于无线通信,但由于无线信道的开放性,接收信号易受同道信号干扰.分析了盲源分离理论抑制同道干扰的可行性,并采用著名的盲源分离算法--FastICA算法进行计算机仿真,结果表明,可采用FnstICA算法分离同道的BASK和QPSK及BPSK和BFSK信号,并消除同道干扰. 相似文献
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数字通信方式广泛应用于无线通信,但由于无线信道的开放性,接收信号易受同道信号干扰。分析了盲源分离理论抑制同道干扰的可行性,并采用著名的盲源分离算法-FastICA算法进行计算机仿真,结果表明,可采用FastICA算法分离同道的BASK和QPSK及BPSK和BFSK信号,并消除同道干扰。 相似文献
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软件GNSS中频信号模拟器 总被引:1,自引:0,他引:1
由于具有结构灵活、开放性强以及成本低的优势,软件GNSS(Global Navigation Satellite System)信号模拟器可成为GNSS接收机设计验证的高效平台。面向GPS/Galileo组合系统,阐述了软件GNSS中频信号模拟器的架构与实现,主要功能模块包括卫星星座仿真、接收机轨迹生成、传播通道特性仿真(包括电离层模型、对流层模型、多径模型、干扰模型)、数字中频信号生成。最后,对这一信号模拟器所产生的GNSS信号(包括GPS L1 C/A,GalileoE1 CBOC)进行了验证。 相似文献
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针对现代雷达技术发展速度加快和愈趋复杂的特点,本文首先指出目前雷达技术在装备研发效率和更新换代速度两方面面临的挑战,并对国内外的发展进行了综述,指出软件化雷达是应对这些挑战的有力手段。然后,给出了软件化雷达体系架构的定义,并提出了包括物理层、中间件层、组件层、应用层的四层体系架构模型。在此基础上,结合开放式系统的概念,分析了软件化雷达组件化设计方法的特点:抽象化、组件化、可重用、可定制、自包容、互操作、松耦合。基于这些特点,软件化雷达组件化设计方法可以实现雷达系统的快速构建。接下来进一步指出了软件化雷达的技术定位是一种平台性技术,会为雷达装备应对各种挑战带来更多可能性。最后,对软件化雷达技术未来的发展方向和需要重视的问题进行了总结。 相似文献
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Yonah Z.O. El-Serafi A.M. Krause A.E. 《Industrial Electronics, IEEE Transactions on》1990,37(6):576-581
A feasibility study on the use of a digital computer as a variable-amplitude variable-frequency oscillator which generates two-phase sinusoidal excitation control signals for a dual-excited synchronous generator is described. The oscillator uses two input signals. One input signal is used to control the frequency of the oscillator outputs, and the other is used to control their amplitudes. By a single variable, the software can be configured to vary the oscillator frequency range and to greatly reduce (almost eliminate) the harmonic distortion of the output signals. The harmonic distortion is constant and independent of the output frequency for each possible oscillator frequency range. The software-based oscillator design is flexible and can be used to generate different types of multiphase signal waveforms 相似文献
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Nonlinearity-Compensation-Free Optical Frequency Domain Reflectometry Based on Electrically-Controlled Optical Frequency Sweep
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A nonlinearity-compensation-free optical frequency domain reflectometry (OFDR) scheme is proposed and experimentally demonstrated based on the electrically-controlled optical frequency sweep. In the proposed scheme, the linear frequency sweep light is generated by propagating an ultra-narrow-linewidth continuous-wave (CW) light through an electro-optic frequency shifter which consists of a dual-parallel Mach-Zehnder modulator (DPMZM) and an electronic 90° hybrid, where the electro-optic frequency shifter is driven by a linear frequency modulated signal generated by a direct digital synthesizer (DDS). Experimental results show that the spatial resolution and signal-to-noise ratio (SNR) of the proposed OFDR scheme without the nonlinear phase compensation are comparable to those of OFDR employing a commercial tunable laser source (TLS), an auxiliary interferometer, and a software-based nonlinear phase compensation method. The proposed OFDR scheme is helpful to reduce the complexity of the optical structure and eliminate the difficulty of developing the nonlinear phase compensation algorithm. 相似文献
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基于ForCES协议的软件集群路由器模型研究 总被引:2,自引:0,他引:2
文章提出了软件集群路由器的参考模型。且对软件集群路由器模型的物理结构、逻辑结构和流量场景进行了深入的分析。通过一个简单的模型实例,提出了总体设计的方案。 相似文献
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FPGA devices maintain the flexibility of software-based solutions, while providing levels of performance that match, and often exceed ASIC solutions. There is a rich and expanding body of literature devoted to the efficient and effective implementation of digital signal processors using FPGA-based hardware. More often than not, the most successful of these techniques involves a paradigm shift away from the methods that provide good solutions in software programmable DSP systems. This article reports on the rich set of design opportunities that are available to the signal processing system designer through innovative combinations of ΣΔ modulation techniques and FPGA signal processing hardware. The applications considered include narrow-band filters, both single-rate and multi-rate; DC canceller; and ΣΔ modulation hybrid digital-analog control loops for simplifying carrier recovery, timing recovery, automatic gain control (AGC) loops in a digital communication receiver 相似文献
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Modern processors embed features such as pipelined execution units and cache memories that can not be directly controlled by programmers through the processor instruction set. As a result, software-based fault injection approaches are even less suitable for assessing the effects of SEUs in modern processors, since they are not able to evaluate the effects of SEUs affecting pipelines and caches. In this paper we report an analysis of a commercial processor core where the effects of SEUs located in the processor pipeline and cache memories are studied. The obtained results are compared with those software-based approaches provide, showing that software-based approaches may lead to significant errors during the error rate estimation. A major novelty of the paper is an extensive analysis of the effects of SEUs in the pipeline of a commercial processor core during the execution of several benchmark programs. 相似文献
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多Web服务器负载均衡技术的研究 总被引:17,自引:0,他引:17
本文分析了近年来数据中心关键技术之一的多Web服务器的负载均衡技术,并设计和实现了一种基于软件的多Web服务器负载均衡软件原理,采用该方法能够有效地平衡负载,尤其适合于单台服务器处理用户请求能力不足而需要扩展三到五倍处理能力的中小型数据中心。 相似文献