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测绘学报  2013 

顾及分段相似性的同震形变时间序列恒星日滤波优化算法

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Keywords: 恒星日滤波,同震形变,相似性度量,GPS地震学,地震

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Abstract:

本文在常规恒星日滤波的基础上,提出了一种顾及分段相似性的恒星日滤波优化算法,即在构建滤波算子之前,首先确定用于构建滤波的坐标残差时间序列与地震当天坐标残差时间序列的分段相似性,然后根据相似性度量指标的大小确定权重后再进行滤波。研究结果表明利用本文提出的顾及分段相似性的恒星日滤波优化方法能够显著改善单历元定位的精度和可靠性,克服常规滤波方法存在的缺陷,有利于恒星日滤波的无人工干预批处理。尤其是通用影像质量评价指数UIQI方法顾及了时间序列间的相关系数以及序列自身的均值和方差,比其它相似性度量更加科学合理,建议采用UIQI作为恒星日滤波优化算法的相似性度量。

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