摘要
针对传统重力固体潮潮汐参数计算方法因数据格式要求严格、参数设置要求严格和算法复杂难以适应现代大规模运行重力台网的观测应用与研究需求的问题,本文提出基于标准时频变换理论的潮汐参数计算方法.相较于传统方法,本文方法面向重力观测数据,通过时频谱分析,直观展示信号组成、变化信息,通过信号提取计算固体潮潮汐参数,为重力固体潮的研究提供了新的视角和方法.仿真试验及库尔勒站实际观测数据处理结果表明本文方法具有如下优势:(1)直观地反映了各个分潮频率、振幅随时间的变化,获得重力观测的即时频率、即时振幅;(2)应用无为方法(一种基于标准时频变换的线通滤波方法),无需逆变换直接从谱中沿着极大值以数据的形式提取调和信号,潮汐分析更加直观;(3)重力固体潮建模,以直观、直接、简洁的方法计算波群振幅因子和相位滞后,在不需要严格数据挑选和参数设置的情况下,获得与传统Venedikov方法精度相当的精确重力固体潮潮汐参数.
This paper addresses the challenges of traditional methods for calculating tidal gravity parameters,which are hindered by strict data format requirements,stringent parameter settings,and complex algorithms,making them difficult to adapt to modern large-scale gravity monitoring networks.We propose a new calculation method based on standard time-frequency transformation theory,which uses time-frequency spectral analysis tailored to gravity observation data.This method intuitively displays signal composition and variations,extracting tidal parameters.Simulation experiments and actual data processing at Korla Station demonstrate three advantages of our approach:(1)it intuitively reflects changes in the frequencies and amplitudes of tidal components over time,providing instantaneous values;(2)it utilizes the"Inaction method"(or"line-pass"filter)to directly extract harmonic signals from the spectrum,enhancing the intuitiveness of tidal analysis;(3)it employs direct methods for modeling solid Earth tides,calculating wave group amplitude factors and phase lags with accuracy comparable to the traditional Venedikov method,all without the need for strict data selection and parameter settings.
作者
韩宇飞
石志敏
祝杰
梁星辉
王勇
HAN YuFei;SHI ZhiMin;ZHU Jie;LIANG XingHui;WANG Yong(Innovation Academy for Precision Measurement Science and Technology,CAS,Wuhan 430071,China;University of Chinese Academy of Science,Beijing 100049,China;China Earthquake Networks Center,Beijing 100045,China)
出处
《地球物理学报》
北大核心
2025年第9期3328-3337,共10页
Chinese Journal of Geophysics
基金
国家重点研发计划(2023YFF0713505)
地震科技星火计划攻关项目(XH23054C)共同资助.
关键词
标准时频变换
重力固体潮
潮汐参数
Normal time-frequency transform
Earth′s tidal gravity
Tidal gravity parameters
