基于PPP动态定位技术的同震地表形变分析

根据沙蚁复眼中的偏振敏感神经结构,设计了一种大气偏振信息检测与导航传感器,实现了从大气偏振信息中提取二维罗盘信息。针对偏振光导航的特点,设计了一种嵌入式多信息源融合导航试验平台,实现了偏振光、三维地磁和GPS导航的有机集成。

Precise Point Positioning with High-rate GPS Data Applied to Seismic Displacements Analysis

In order to obtain the displacements of observation points,high-rate GPS data sets are utilized to compute the positions epoch-by-epoch with precise point positioning (PPP) techni-que. However,the precision of PPP technology is affected by systematic errors that are not currently modeled. This paper investigates high-rate GPS positioning time series and describes methods for weakening these effects. Spatial stacking and sidereal filtering methods are introduced to improve the PPP positioning results. Some high-rate GPS observation data at permanent sites from San Simeon earthquake in America and Wenchuan earthquake in China,respectively,are calculated and analyzed. Numerical results demonstrate that stacking method could efficiently eliminate spatial correlation error between stations. While sidereal filtering has positive effect on removing multipath error. Both methods could be used in reducing positioning noise involved in PPP,and make it easier to accurately detect weak earthquake signals.