确定精密重力仪相位滞后方法的研究

从系统辨识的原理出发,给出了确定精密重力仪相位滞后的一种方法,即记录精密重力仪在阶跃信号作用下的输出数据,利用这些数据对仪器的传递函数进行辨识,从而确定重力仪对各潮汐波产生的相位滞后角度.用这种方法对ET-21地潮重力仪进行了相位滞后的确定,并给出这台仪器对15个主要潮汐波的相位滞后角度.

STUDIES ON A METHOD FOR DETERMINING THE PRECISE GRAVIMETER PHASE LAG

Since the 1980s, global earth models based on seisndc and free oscillation datahave predict 0°-0.02° phase lag corresponding to about 0- 2 s time lag for tidalwaves at the earth's surface' In principle, phases from earth tide observations couldhelp to verify the global earth models or to constrain the adustment of these modelsif the phases of earth tide observations corrected would be accurate to much betterthan 0'02 ° . For this purpose, it is important to deterndne the phase lag of the pre-cise gravimeter' ACCording to system identification principle, a method fordeterndning the phase lag of the precise gravimeter is given in this paPer' As anexample, the method was used to detendne the phases lag of the ET-2l and it wasshown that the phases lag angle t0 be relative to l5 main tidal waves individually'