7 results about "Earth tide" patented technology

The invention relates to the technical field of earthquake monitoring, and discloses a comprehensive earthquake prediction method, which comprises the following steps of: acquiring a continuous micro-motion data sequence to reconstruct an empirical green function sequence, and dividing the empirical green function sequence into a compression phase subset and a stretching phase subset by utilizing a synchronously acquired theoretical earth tide stress phase; respectively extracting a causal branch waveform corresponding to the positive time axis and a non-causal branch waveform corresponding to the negative time axis, and determining a weight index for inhibiting the non-structural interference by calculating a reciprocity residual error between a causal wave velocity offset and a non-causal wave velocity offset; correcting a wave velocity offset mean value by using the weight index to obtain a stress sensitivity coefficient reflecting the stress state of the earth crust medium; according to the method, a physical criterion is established by using an elastic wave propagation reciprocity principle, decoupling of medium attribute change and noise source spatial drift is realized, and visual wave velocity offset induced by environmental interference is eliminated.

The invention provides a shipborne marine gravimeter quasi-static test evaluation method and device, belongs to the technical field of marine geophysical measurement, adopts a dual correction mechanism to reconstruct the structural composition of a data processing function module, and specifically adopts a technical means of synchronously collecting GNSS elevation change data to realize accurate measurement. The GNSS positioning system is rigidly connected with the gravimeter to continuously record elevation change data of the ship; calculating a gravity correction value caused by elevation change; the earth tide correction value and the elevation change correction value are deducted from gravity observation data at the same time, the accurate residual observation quantity is obtained, the technical inertia that in the prior art, only earth tide correction is considered, but the elevation change influence is ignored is broken, the GNSS system is ingeniously used for recording the ship elevation change condition, and a dual correction mechanism is adopted; the problem that the evaluation result is inaccurate due to the fact that the ship fluctuates along with the tide level in a wharf mooring test is solved, and then the technical effect of accurately evaluating the performance of the gravimeter in the quasi-static environment is achieved.

This invention relates to a method and system for inverting parameters of fractured aquifers in response to groundwater solid tides, comprising the following steps: establishing a mathematical model of the groundwater solid tide response of a fractured aquifer considering both pore and fractured media, and solving the mathematical model to obtain an analytical solution; acquiring hydrological borehole water level data of the fractured aquifer to be estimated, and obtaining the amplitude ratio and phase difference characteristic parameters of the water level response to solid tide stress changes; fitting the analytical solution with the amplitude ratio and phase difference characteristic parameters, and selecting the coefficient of determination R. 2 The parameter value corresponding to the largest fitted curve is used as the inversion result of the fractured aquifer parameters. The dual-medium model can realistically depict the groundwater movement law in the pore-fracture system of the fractured aquifer under solid tide response, and can intuitively understand the influence of the hydrogeological parameters of the dual media in the fractured aquifer on the groundwater solid tide response, providing a more reliable theoretical basis and method for accurate inversion of fractured aquifer parameters.

The invention discloses a surface deformation inversion method considering an atmospheric effect, and relates to the technical field of remote sensing. The method comprises the following steps: screening out differential interferograms influenced by atmospheric pollution from a plurality of initial differential interferograms to obtain a plurality of differential interferograms; performing principal component analysis on the evaluation factors of the differential interferogram to obtain the weight of each evaluation factor; performing weighted summation on the values of all the evaluation factors and the weights of the evaluation factors to obtain a comprehensive score of the differential interferogram, performing screening according to the comprehensive score to obtain a target differential interferogram, and constructing an interferogram network; performing interference net inversion to obtain a phase value of each pixel in the interference pattern network, and sequentially performing earth tide phase correction, atmospheric delay phase correction and terrain phase residual correction on the phase values of the pixels to obtain corrected phase time sequence data; and obtaining earth surface deformation information of the research area based on the corrected phase time sequence data. According to the method, the precision of surface deformation inversion is improved.

An earthquake analysis and calculation system based on tidal theory includes a tidal theory calculation module, a fault parameter and stress projection module, an earthquake event import module, and an analysis module. The output of the tidal theory calculation module is connected to the input of the fault parameter and stress projection module, the output of the fault parameter and stress projection module is connected to the input of the earthquake event import module, and the output of the earthquake event import module is connected to the input of the analysis module. The tidal theory calculation module includes input time and spatial parameters and outputs a tidal stress tensor. The fault parameter and stress projection module includes input fault plane parameters and outputs tidal shear stress and normal stress. The earthquake event import module includes inputting earthquake event data and outputting tidal stress and earthquake event data, which are then transferred to the analysis module. The analysis module includes outputting a fused visualization result of tidal stress and earthquake events. This invention integrates solid tidal theory calculation and earthquake analysis.

The invention belongs to the technical field of instruments and meters, and discloses a miniaturized MEMS gravimeter and a gravity measurement environment compensation method based on orthogonalization regression. The miniaturized MEMS gravimeter provided by the invention adopts a compact structural design and has the characteristic of low power consumption. According to the method, a tidal component protecting group is constructed, strict orthogonalization processing is carried out on environmental variables, effective separation of tidal components and environmental disturbance in a mathematical space is achieved, and the problem that tidal signals are wrongly absorbed or weakened due to frequency spectrum overlapping in a traditional compensation method is solved. The characteristic ensures that the amplitude and the phase of the earth tide signal are kept in physical consistency, so that the gravity measurement result is more reliable and accurate, and the method is particularly suitable for long-term continuous observation tasks sensitive to tide characteristics.

This invention relates to a method and system for inverting hydrogeological parameters of karst aquifers in mines. The method includes the following steps: constructing a mathematical model of groundwater solid tide response considering the effects of crossflow and well storage under mining conditions, and solving for analytical solutions of the aquifer head amplitude ratio and phase difference under tidal stress; acquiring long-term water level monitoring data from hydrological boreholes in the mining area, and extracting and separating the amplitude ratio and phase difference characteristic parameters of specific wave components of the solid tide; fitting the analytical solution with the extracted amplitude ratio and phase difference characteristic parameters, and introducing a nonlinear least squares optimization algorithm for multi-parameter joint inversion, taking the parameter value corresponding to the fitting curve with the largest coefficient of determination as the final hydrogeological parameter inversion result. By constructing a coupled model that better conforms to the actual mining disturbance conditions and combining it with an optimization algorithm, the problem of multi-parameter inversion is solved, and the inversion accuracy of hydrogeological parameters of deep karst aquifers under mining disturbance is significantly improved.