共查询到16条相似文献,搜索用时 78 毫秒
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非理想信道下Colpitts混沌电路的自适应同步研究 总被引:1,自引:0,他引:1
本文研究了Colpitts混沌电路在非理想信道条件下的自适应同步问题。引入自适应控制器对输入到响应部分(response system)的衰变混沌信号进行预处理,来补偿衰落信道对于同步性能的影响。给出了系统的数学模型,对恒定信道衰变和时变信道衰变两种非理想信道条件下的混沌ColpiRs电路的自适应同步进行了数值仿真研究。仿真结果表明,对于恒定或慢变化的时变信道衰变,自适应控制器可以有效的提高Colpitts电路响应部分和驱动部分(Drive system)的同步性能。 相似文献
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以Colpitts振荡器电路为例,在建立Colpitts电路模型的基础上,对其进行PSpice仿真研究,观察状态变量分别在时域和频域中的变化.通过调整电路元件的参数,观察Colpitts电路中动力学行为的演变过程,得到了与理论分析相吻合的结果.可以发现,电路处于混沌态和准周期态的参数组合不是唯一的. 相似文献
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基于Colpitts混沌系统的新型测距算法研究 总被引:1,自引:0,他引:1
Chuas混沌同步对噪声比较敏感,导致同步抗噪声能力不理想.为解决这个问题,文中提出采用Colpitts混沌系统作为新型测距算法的研究对象.该算法发射带有正弦信号的混沌信号,混沌同步后,恢复出带有距离信息的正弦信号,通过比较两个正弦信号的初始相位,从而测出目标距离信息.与Chuas相比,Colpitts同步具有较好的单调性和抗噪声能力强的优点,仿真结果验证上述方法的有效性. 相似文献
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Particle Filter-Based Synchronization of Chaotic Colpitts Circuits Combating AWGN Channel Distortion
Zhi-Guo Shi Shao-Hua Hong Ji-Ming Chen Kang-Sheng Chen You-Xian Sun 《Circuits, Systems, and Signal Processing》2008,27(6):833-845
In this paper, synchronization of chaotic Colpitts circuits using a particle filter (PF) to combat the additive white Gaussian
noise (AWGN) channel effect is studied by numeric simulations. A novel PF algorithm suitable for chaos synchronization is
proposed. With this algorithm, chaos synchronization of Colpitts circuits can be achieved and maintained in AWGN channels.
Parameters in the proposed PF algorithm are studied to understand their effects on synchronization performance. The synchronization
performance using the proposed PF algorithm is compared with those using other digital filters, such as the extended Kalman
filter and the generic PF. It is found that the proposed PF algorithm performs better than the other digital filters. Simulation
results also show that the particle number is not very critical to the synchronization performance when this PF algorithm
is used. 相似文献
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混沌电路的温度特性及其在温度测量中的应用 总被引:9,自引:1,他引:9
本文给出了一种基于映射式混沌电路的温度测量新方法,与现有的测量方法完全不同。把对温度敏感的所有元件参数都考虑在内,测量过程中将这些元件都置于测温环境中,电路输出的符号序列直接反映了温度的变化。因此不再有测量电路的温度漂移的问题,具有较高的精确度和灵敏度。此外,该电路的结构简单,又能直接输出反映温度变化的二进制代码,即数字信号,便于计算机处理。计算机仿真和实际电路实验都显示该方法的优越性。 相似文献
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针对某些雷达、通信等系统在应用中对混沌信号频域带宽的要求,设计了一种基于考毕兹振荡器电路的宽带混沌信号发生器。该混沌信号产生电路由考毕兹振荡器为基本谐振电路、级联若干容阻串并联单元的选频网络构成,混沌信号的上下限频率分别由基本谐振电路和第一节容阻串并联网络参数决定,通带频谱的平坦性受其他级联选频网络影响。根据初步分析和仿真试验,该混沌电路组成结构简单,能够产生带宽超过60MHz较为平坦的宽带混沌信号。 相似文献
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Shi Zhiguo Ran Lixin Chen Kangsheng 《电子科学学刊(英文版)》2006,23(3):433-436
Chaotic Colpitts circuits with fundamental frequency f^* beyond 1GHz are studied by both circuit simulation and experiment using Philips' broadband transistor with threshold frequency of 25GHz. For the basic configuration of Colpitts circuit with f^* of about 1,6GHz, broadband continuous power spectra could be obtained from both circuit simulations and experiments. The harmonics of the observed signal from Agilent PSA/ESA spectrum analyzer are as noticeable as far as 12GHz. A modified Colpitts circuit structure employing the parasitic inductance of BJT (Bipolar Junction Transistor) is also proposed and investigated. By circuit simulation, chaotic attractor and broadband continuous power spectra could be obtained from the modified Colpitts circuit with f^* of about 3.5GHz. Because the parasitic effects of the prototype board, the experiment result of the modified Colpitts circuit does not agree well with the simulation result. The gap between the simulation and experimental result could be bridged by replacing the lumped circuit elements with distributed ones. 相似文献
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文氏桥式振荡电路特性及数值仿真分析 总被引:1,自引:0,他引:1
正弦波振荡电路是模拟电路课程的基本教学内容,几乎所有的教材都采用反馈的概念来分析正弦振荡电路的特性.本文通过列写文氏桥式振荡电路的电路方程,分析了该电路的振荡特性,并采用数值仿真的方法模拟起振条件,得到了与现有教材对该电路分析一致的结果.上述分析结果可供讲授电路理论及模拟电路课程的教师参考. 相似文献