33 results about "Earth tide" patented technology

The invention discloses a ground tilt monitoring device .The ground tilt monitoring device comprises a device shell, a suspension frame and a processing circuit board are arranged in the device shell, two capacitive sensors are orthogonally arranged on the suspension frame, each capacitive sensor comprises capacitor stators, capacitor rotors and pendulum bobs, the capacitor stators are arranged on the two sides of the capacitor rotors at equal intervals, the capacitor stators and the capacitor rotors are horizontally arranged on the same horizontal plane, the capacitor stators are arranged on the suspension frame, the pendulum bobs are arranged on the suspension frame in a hanging mode and arranged on the lower portions of the capacitor rotors to be in rigid connection with the capacitor motors, the capacitive sensors are electrically connected with the processing circuit board respectively, and a zero setting mechanism is further arranged on the suspension frame .According to the ground tilt monitoring device, when zero setting is conducted, the two capacitive sensors do not influence each other, the pendulum bobs drive the capacitor rotors to move to change the space between the capacitor rotors and the capacitor stators so as to produce capacitance variable quantity, and the influence of static friction force of pendulum bobs in the prior art is eliminated; the ground tilt monitoring device is mainly used for monitoring earth tides, earthquake precursors and tilting deformation of an earth crust, and the ground tilt monitoring device is simple in structure, good in stability, high in precision and high in output linearity.

The invention relates to a method for removing tidal strain components of borehole strain data based on minimum noise separation, which uses an adaptive window width filtering algorithm to estimate the high-frequency signal of the borehole strain data sample matrix; calculates the covariance matrix of the estimated high-frequency signal , and perform eigenvalue decomposition; use the covariance matrix of the high-frequency signal to construct the adjustment matrix; use the constructed adjustment matrix to adjust the covariance matrix of the borehole strain data sample matrix; The covariance matrix is ​​subjected to the minimum noise separation transformation and the minimum noise separation transformation components are obtained. The matrix formed by the minimum noise separation transformation components is expressed as; the harmonic period of the minimum noise separation component is calculated; the harmonic period is selected to be the same as the tidal strain component harmonic period Reconstruct the corresponding minimum noise separation components; calculate and remove the data of the tidal strain component, and remove the tidal strain component in a targeted manner, without calculating the theoretical solid tide.

The invention belongs to the digital seismic observation field and relates to a borehole strain observation full-frequency band data acquisition device. The data acquisition device is provided with two 4-input data acquisition channels, can simultaneously generate second-sampling and 100-sampling high-precision and wide-dynamic range observation data and 10000Hz-sampling high-sampling rate observation data, and carry out precise synchronization on the observation data through a GPS clock; and the borehole strain observation full-frequency band data acquisition device and a 4-component borehole strain seismograph can be combined together to form an observation system of which the frequency band ranges from 10<-6>Hz to 1000Hz, which can carry out digital observation of earth tide, seismic wave and high-frequency microquake or earth sound. According to the borehole strain observation full-frequency band data acquisition device, the traditional earth tide observation function of a borehole strain instrument is reserved; a seismic wave observation new means which cannot be realized by a pendulum seismograph can be provided; especially a high-frequency microquake observation function or an earth sound observation function is realized; and the cognition of people for seismic waves can be enriched. The borehole strain observation full-frequency band data acquisition device covers all frequency bands in the seismic observation field and has great application significance in deepening the understanding of people for high-frequency microquake or earth sound and the like.

The invention discloses a GNSS-based north pole region ionized layer phase scintillation factor construction method, which is used for monitoring astronomical disasters in a north pole region. The method comprises the following steps: firstly, selecting an original GNSS phase observation value in the north pole region; correcting a satellite clock, a receiver phase center, relativity, phase wrapping, troposphere delay and a solid tide error through a model method, and further eliminating a receiver clock error and troposphere wet delay which cannot be corrected by the model through a precise single-point positioning method; using the discrete wavelet transform technology to reduce the noise of the signal and reduce the extraction of the noise on an ionospheric scintillation signal; performing time-frequency analysis on the signal by using a continuous wavelet transform technology, extracting an empirical signal frequency band range, and extracting the ionospheric scintillation signal;and setting a translation window, and obtaining a standard deviation of the ionospheric scintillation signal in the window to complete ionospheric phase scintillation factor construction. The method has the advantages of simple steps, low detection cost and wide practicability.