共查询到20条相似文献,搜索用时 593 毫秒
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文章分析了可适用于高动态情况下的捕获方法一匹配滤波器法。对匹配滤波器的具体设计方法进行了分析说明,同时对其捕获的动态范围及提高灵敏度的措施进行了详细说明。文章对于准备采用匹配滤波器法实现高动态捕获的设计人员具有一定的指导意义。 相似文献
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扩频数字接收机匹配滤波器的设计与实现 总被引:1,自引:1,他引:0
介绍了扩频数字接收机中利用匹配滤波器捕获伪码的原理。就某型号接收机对匹配滤波器的原理进行了理论分析.给出了在FPGA中匹配滤波器的软、硬件设计与算法实现。通过对设计电路的实时仿真表明:该匹配滤波器具有设计合理、捕获精度高、使用灵活方便等特点,可应用于其他扩频系统的数字接收机中。 相似文献
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扩频信号的捕获与跟踪是扩频接收机进行定位解扩的基础,文中基于FPGA进行了扩频信号捕获与跟踪的设计实现。分析了该方案的匹配滤波器、载波跟踪环、码跟踪环的设计与实现方法。并通过BPSK调制,使用非相干扩频通信的PN码并行捕获算法实现信号的捕获。 相似文献
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LIU Ji-xue ZHONG Xian-xin 《半导体光子学与技术》2006,12(1):35-38
A new surface acoustic Wave differential quadraphase shift key(SAW DQPSK) spread spectrum (SS) signal matched filter based on the fusion of SS and differential modulation is reported. The design of multi-phase coded SAW matched filter is proposed rather than another design of SAW DQPSK filter, which can cut in a half of the delay time of SAW DQPSK matched filter and SAW fixed delay line(FDL) used for differential demodulation. This breakthrough is made the system largely reduce a size and process much easily. This method can also be feasible in other SAW MPSK matched filter design especially when the modulation phase number is larger than 4. The design example and its experimental results are given. 相似文献
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介绍了匹配滤波器原理,分析了匹配滤波并行处理的算法,提出了一种适合高速处理的并行数字匹配滤波器的设计方法。使用Matlab软件进行了仿真,根据仿真结果证明了此设计方法可行。给出了利用可编程门阵列(Field-Programmable Gate Array,FPGA)实现16阶高速并行数字匹配滤波器的方案,指出了实现的要点。在系统中进行了性能测试,结果表明,采用该并行处理算法实现的数字匹配滤波器适合高速信号处理。 相似文献
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巴克码信号是二相编码信号的一种,在PD雷达中得到了广泛应用。对巴克码信号进行匹配滤波处理可使输出信噪比达到最大。介绍了匹配滤波器的设计原理,给出白噪声匹配滤波器的传递函数模型。在Matlab/Simulink平台上,建立雷达发射信号为巴克码信号时匹配滤波器的仿真模型。计算机仿真表明,巴克码信号经匹配滤波器后脉冲宽度被压缩,信噪比得到了显著提高。该滤波器的脉冲压缩功能,解决了一般脉冲雷达通过增加脉冲宽提高作用距离与距离分辨力下降的矛盾。 相似文献
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毫米波雷达直升机旋翼回波匹配滤波研究 总被引:2,自引:2,他引:0
针对低重频毫米波雷达直升机旋翼回波信号检测中旋翼回波信噪比低的问题,本文采用发射大时宽带宽的线性调频信号,接收匹配滤波处理以增加旋翼回波信号的信噪比,并推导了线性调频旋翼回波模型。由于旋翼旋转对雷达回波产生调幅效应,使其对线性调频匹配滤波器失配,造成信噪比的下降。本文利用匹配滤波的概念,用旋翼匹配滤波器组近似达到了旋翼匹配滤波的性能,提高后端旋翼回波检测的信噪比。 相似文献
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Dean J Krusienski Gerwin Schalk Dennis J McFarland Jonathan R Wolpaw 《IEEE transactions on bio-medical engineering》2007,54(2):273-280
A brain-computer interface (BCI) is a system that provides an alternate nonmuscular communication/control channel for individuals with severe neuromuscular disabilities. With proper training, individuals can learn to modulate the amplitude of specific electroencephalographic (EEG) components (e.g., the 8-12 Hz mu rhythm and 18-26 Hz beta rhythm) over the sensorimotor cortex and use them to control a cursor on a computer screen. Conventional spectral techniques for monitoring the continuous amplitude fluctuations fail to capture essential amplitude/phase relationships of the mu and beta rhythms in a compact fashion and, therefore, are suboptimal. By extracting the characteristic mu rhythm for a user, the exact morphology can be characterized and exploited as a matched filter. A simple, parameterized model for the characteristic mu rhythm is proposed and its effectiveness as a matched filter is examined online for a one-dimensional cursor control task. The results suggest that amplitude/phase coupling exists between the mu and beta bands during event-related desynchronization, and that an appropriate matched filter can provide improved performance. 相似文献
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Dean J. Krusienski Gerwin Schalk Dennis J. McFarland Jonathan R. Wolpaw 《IEEE transactions on bio-medical engineering》2007,54(2):273-280
A brain-computer interface (BCI) is a system that provides an alternate nonmuscular communication/control channel for individuals with severe neuromuscular disabilities. With proper training, individuals can learn to modulate the amplitude of specific electroencephalographic (EEG) components (e.g., the 8-12 Hz mu rhythm and 18-26 Hz beta rhythm) over the sensorimotor cortex and use them to control a cursor on a computer screen. Conventional spectral techniques for monitoring the continuous amplitude fluctuations fail to capture essential amplitude/phase relationships of the mu and beta rhythms in a compact fashion and, therefore, are suboptimal. By extracting the characteristic mu rhythm for a user, the exact morphology can be characterized and exploited as a matched filter. A simple, parameterized model for the characteristic mu rhythm is proposed and its effectiveness as a matched filter is examined online for a one-dimensional cursor control task. The results suggest that amplitude/phase coupling exists between the mu and beta bands during event-related desynchronization, and that an appropriate matched filter can provide improved performance 相似文献
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本文从滤波器的观点出发,得到用于线性系统解卷积,MLS相关器的等效匹配滤波器结构,并给出该滤波器的性质。本文讨论了该匹配滤波器设计时的参数选择并给出仿真算例。 相似文献