利用全球分布超导重力台站探测Slichter模分裂信号

发布时间：2018-04-12 12:08

  本文选题：Slichter模 + 超导重力　； 参考：《武汉大学学报(信息科学版)》2016年08期

【摘要】：观测地球内核平动振荡Slichter模有助于约束地球内部结构,但其探测仍是国际性难题。基于全球分布的9个超导重力(Superconductiug Gravimeter,SG)台站的11个观测序列,利用最优序列估计(optimal sequence estimation,OSE)方法进行了探测实验。首先利用模拟的11个SG台站记录验证了OSE方法的有效性,然后将OSE方法用于剔除潮汐及气压等影响后的实测重力残差数据,但所得结果中仍残留有高阶潮波信号。针对此,利用解调过程进一步剔除了这些信号,以消除对目标信号识别的影响。最终结果表明,没有发现Smylie于1992年发表论文中所声称的观测结果,但找到了另外一组满足分裂规律的可能信号,其周期分别为4.310±5.7×10-3 h(m=-1)、3.914±6.4×10-3 h(m=0)和3.642±5.1×10-3 h(m=+1)。该组信号很可能是Slichter模三重分裂信号,但仍需进一步验证。
[Abstract]:The observation of the translational oscillation Slichter mode in the earth's core is helpful to constrain the internal structure of the earth, but its detection is still an international problem.Based on the 11 observation sequences of 9 superconducting gravity stations distributed globally, the optimal sequence estimation (ose) method is used to carry out the detection experiments.The validity of the OSE method is verified by 11 simulated SG stations, and then the OSE method is applied to the measured gravity residuals after the tidal and atmospheric pressure are excluded. However, there are still high order tidal wave signals in the obtained results.In order to eliminate the influence on target signal recognition, the demodulation process is used to further eliminate these signals.It is very likely that the set of signals is a Slichter mode triple splitting signal, but further verification is needed.
【作者单位】： 武汉大学测绘学院;地球空间环境与大地测量教育部重点实验室;
【基金】：国家自然科学基金(41174011,41574007) 国家973计划(2013CB733305)~~
【分类号】：P315.7
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本文编号：1739686