| Summary: | 碩士 === 國立雲林科技大學 === 電機工程系碩士班 === 92 === In this thesis, we develop a robust adaptive chaotic synchronization technique to achieve transmitting the information in one channel. There are three steps to setup a robust adaptive synchronization. Model reference control (MRC) and observable parametric model are first considered to model the control law and the chaotic systems under the system parameters are prior known.
Furthermore, a SPR-Lyapunov adaptive algorithm is derived to estimate the control parameters. Combing the SPR-Lyapunov adaptive algorithm and the observable parametric model, the scheme of MRAC are developed to achieve the adaptive synchronization under the system parameters are unknown. Finally, the robust adaptive strategy algorithm is proposed to treat the adaptive synchronization in the presence of noise. However, the results of systems simulation are shown that the robust adaptive synchronization is not efficient, because that the system error are not perfect. Therefore, VS-MRAC algorithm is proposed to overcome the problem. The advantage of VS-MRAC is that the synchronization error may decay to zero in the finite time. From the theorem and results of the VS-MRAC algorithm, the robust adaptive synchronization can be perfectly achieved.
In our thesis, we will do not only the numerical simulation to verify proposed theories but also an implementation to set up a proposed chaotic synchronization system based on DSP. From the results of DSP implementation, the VS-MRAC control method can not provide a perfect result as those of computer simulation. The main reason is that the sampling rate of AD/DA on DSP C6711 is 8k Hz. To improve the results, we will further modify the VSS algorithm and raise the sampling rate of AD/DA in future.
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