大连理工大学电子与信息工程学院,辽宁,大连,116024
纸质出版:2004
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邱天爽, 王宏禹, 孙永梅. 一种基于分数低阶协方差的自适应 EP潜伏期变化检测方法[J]. 电子学报, 2004,32(1):91-95.
QIU Tian-shuang, WANG Hong-yu, SUN Yong-mei. A Fractional Lower-Order Covariance Based Adaptive Latency Change Detection for Evoked Potentials[J]. Acta Electronica Sinica, 2004, 32(1): 91-95.
由于诱发电位(EP)信号中含有分数低阶
α
稳定分布噪声
致使传统的基于二阶统计量的EP潜伏期变化检测方法性能显著退化.本文提出了一种基于分数低阶协方差的自适应EP潜伏期变化检测方法(AFLC)
通过对带噪信号的非线性处理
把其转变为二阶矩过程
从而保证了算法在
α
∈(0
2
]
范围内的可靠收敛
并获得了EP潜伏期变化估计的较高韧性和精度.给出了性能分析
计算机仿真和实验数据分析的结果.
Traditional second order-based EP latency change detection methods usually degenerate under fractional lower order -stable noise conditions.This paper proposes a fractional lower order covariance based algorithm
which changes the noise contaminated EP signal into a finite second order moment process by a non-linear transform
and guarantees its convergence in the entire range of
α
∈(0
2
]
and obtains a high robustness and accuracy for latency change estimation.The paper also gives the theoretical analysis for the performance of AFLC and simulation and data analysis results.
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