近场大位移下GPS与强震仪记录的差异性分析

发布时间：2018-12-25 21:04

【摘要】：本文用频域仿真的方法对强震仪加速度记录积分得到位移记录,引入相关系数分析了大位移作用下的强震仪与GPS位移记录的一致性和差异性,结果表明,稳定激发下,两者水平向位移记录的初始相关系数均超过0.8,具有较大的相似度,但仍存在一定的幅值差异,本文主要通过对比分析大位移实验和稳定激发实验来研究该差异性。分析了大位移实验的信噪频谱,大位移实验与稳定激发实验的信号频谱,认为在大位移实验中,强震仪在问题频段的记录很有可能是信号而非噪声。随后,在转角时程中发现,在大转角位移作用下,强震仪和GPS位移记录的差异性表现得更明显,这可能是强震仪受工作原理限制,无法记录到旋转位移所致。随后,本文依据GPS记录的转角信息对强震仪位移进行修正,校正后的位移记录幅值差异明显减小,可以认为由工作原理差异致使参考坐标系的不同是引起两者记录幅值差异的主要原因,同时,也说明GPS能有效的校正强震仪在有转角的复杂观测环境下的位移记录。
[Abstract]:In this paper, the method of frequency domain simulation is used to get the displacement record of the acceleration record of the strong seismograph. The consistency and difference between the strong seismograph and the GPS displacement record under the action of large displacement are analyzed by introducing the correlation coefficient. The results show that, under the stable excitation, The initial correlation coefficients of the two horizontal displacement records are more than 0.8, which have great similarity, but there are still some amplitude differences. This paper mainly studies the difference by comparing and analyzing the large displacement experiment and the stable excitation experiment. The signal-noise spectrum of the large displacement experiment, the signal spectrum of the large displacement experiment and the steady excitation experiment are analyzed. It is considered that the recording of the strong earthquake instrument in the problem frequency range is probably a signal rather than a noise in the large displacement experiment. Then, it is found that under the action of large angle displacement, the difference between strong seismograph and GPS displacement record is more obvious, which may be due to the limitation of the working principle of the strong seismograph and the inability to record the rotational displacement. Then, according to the rotation angle information recorded by GPS, the displacement of strong seismograph is corrected, and the difference of amplitude of displacement recorded after correction is obviously reduced. It can be considered that the difference of reference coordinate system caused by the difference of working principle is the main reason for the difference of recording amplitude between them. At the same time, it also shows that GPS can effectively correct the displacement record of strong seismograph in complex observation environment with rotation angle.
【作者单位】：福州大学土木工程学院;福建省地震局;
【基金】：国家自然科学基金项目(41474071)~~
【分类号】：P315.8

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