利用混沌系统进行微弱信号检测时，确定系统由混沌态转化为大尺度周期态的混沌临界阈值至关重要。仿真表明：选取不同精度的混沌临界阈值将对混沌系统检测性能产生影响，选取的临界阈值精度越高，能够检测到信号的信噪比越低，但同时其对噪声检测的虚警率也越高。因此，实际检测中需根据检测要求来选取合适精度的临界阈值，以使检测性能达到检测要求。
Determining the critical value of chaotic system which brings the system from chaotic state to large-scale periodic state is very important in detecting weak signal by chaotic system. Simulation shows that choosing critical value of chaotic system with different precision will influence the detection performance of chaotic system. The higher precision of critical value of chaotic system, the signal with lower SNR (SNR, signal to noise ratio) can be detected by chaotic system, while the higher false alarm rate is derived. Therefore in actual signal detection, suitable precision of critical value of chaotic system should be chosen based on detection requirement in order to bring detection performance achieve the detection requirement.
2016,38(10): 137-141 收稿日期：2016-3-2
DOI：10.3404/j.issn.1672-7619.2016.10.028
分类号：TP391
作者简介：石敏(1979-),女,博士,工程师,主要从事水声信号处理方面的研究。
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