共查询到16条相似文献,搜索用时 171 毫秒
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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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基于Chua电路混沌同步自保持特性的研究 总被引:10,自引:2,他引:8
本文介绍了Chua电路及其特性,给出实现非线性电阻的一种电路;利用Chua电路构造出一种驱动-响应混沌同步系统,利用仿真得出此同步系统具有一定鲁捧性,抗干扰等特性;根据此同步系统,仿真发现混沌同步具有自保持特性,并给出仿真结果,这一发现为混沌在保密通信的实际应用提供了依据. 相似文献
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基于混沌同步的混沌脉冲定位调制研究 总被引:2,自引:2,他引:0
随着混沌理论和混沌同步的发展及完善,根据混沌脉冲定位调制(CPPM)的基本原理,提出一种基于混沌同步的混沌脉冲定位调制(CS—CPPM)实现方法,建立以蔡氏混沌同步电路和Logstic映射为例的实现模型,用EWB仿真软件对蔡氏二极管、蔡氏电路以及蔡氏同步电路进行分析和实现,最后用Matlab对整个系统进行仿真,实验结果论证了该方法的可行性.这样使得混沌脉冲定位调制信号可以利用现有的混沌映射实现.从而具有多样性和稳定的混沌特性。也使得混沌脉冲定位调制(CPPM)技术具有更多的实现途径和更深的研究与应用价值。 相似文献
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Zhiguo Shi Songjie Bi Hongtao Zhang Rongxing Lu Xuemin Shen 《Wireless Communications and Mobile Computing》2015,15(10):1456-1470
In this paper, we propose a synchronization scheme based on an improved auxiliary particle filter (IAPF) for chaotic Colpitts circuit and conduct an experimental study on the synchronization performance with application to secure communications. Specifically, with the synchronization scheme, when the chaotic signals generated by an analog Colpitts circuit are transmitted through a nonideal channel, the distorted signals are processed digitally by the novelly designed IAPF at the receiver, in order to obtain the synchronized signals of the transmitter circuit. Experimental results indicate that synchronization can be achieved over both the additive white Gaussian noise channel and the multipath fading channel with low signal‐to‐noise ratio, even if there exist severe circuit parameter mismatches between the transmitter and the receiver. Furthermore, a chaos‐masking secure communication system is constructed and verified over both the additive white Gaussian noise channel and the multipath fading channel, and the bit error rate is evaluated versus different signal‐to‐noise ratios and symbol periods. It is shown that the achievable bit error rate can reach the order of magnitude of 10 − 4 without error correction coding techniques. In addition, security analysis demonstrates that the proposed chaotic secure communication system is resistant to the brute‐force attack. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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Shaohua Hong Zhiguo Shi Lin Wang Yujie Gu Kangsheng Chen 《Circuits, Systems, and Signal Processing》2013,32(2):825-841
For chaotic trajectories, when the system parameters are fixed, they are generally confined in a bounded state space. In this paper, we propose an adaptive regularized particle filter (RPF), which makes the best of this inherent characteristic, for identical synchronization of chaotic Colpitts circuits combating additive white Gaussian noise (AWGN) channel distortion. This proposed filter incorporates RPF that resamples from a continuous approximation of the posterior density to avoid sample impoverishment and then utilizes the revised Kullback–Leibler distance (KLD) sampling to adaptively select the number of particles used. Compared with the existing particle filters (PFs) with fixed large number of particles, this proposed adaptive RPF propagates less number of particles with similar performance and thus provides a much more efficient solution for this problem. 相似文献
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Synchronization and Parameters Identification of Chaotic Systems via Adaptive Control 总被引:1,自引:0,他引:1
WANGZhong-sheng LIAOXiao-xin 《中国电子科技》2005,3(1):64-67
Based on Lyapunov stability theory, a novel adaptive controller is designed for a class of chaotic systems. The parameters identification and synchronization of chaotic systems can be carried out simultaneously. The controller and the updating law of parameters identification are directly constructed by analytic formula. Simulation results with Chen‘s system and Roessler system show the effectiveness of the proposed controller. 相似文献