Six-degree-of-freedom wideband integrated seismic monitoring system

Abstract

The invention discloses a six-degree-of-freedom wideband integrated seismic monitoring system which at least comprises a sensor integration unit and a data fusion unit. The sensor integration unit comprises a GNSS receiver, a three-axis accelerator and a three-axis gyroscope which are arranged at a same sit and used for synchronously collecting GNSS observation data, acceleration observation dataand angular speed observation data and storing the same, the data fusion unit comprises a GNSS data positioning and processing module, an integrating, fusing and measuring data module and a comprehensive filter, the GNSS data positioning and processing module is used for positioning calculation according to the GNSS observation data, the integrating, fusing and measuring data module is used for fusing GNSS position information, the acceleration observation data and the angular speed observation data, and the comprehensive filter is used for calculating according to data after fusion. The system can realize single-station six-degree-of-freedom seismic monitoring, expand seismic monitoring bandwidth and improve seismic monitoring ability.

Description

technical field [0001] The invention relates to a six-degree-of-freedom broadband integrated earthquake monitoring system. Background technique [0002] Complete and accurate acquisition and restoration of seismic wave signals of near-field strong earthquake events in various time-space frequency bands is an important basis for in-depth study and understanding of large earthquakes. However, an important shortcoming of the current research on near-field strong earthquakes is that the extremely low-frequency observation information (such as more than 20 seconds) may be submerged in various noises or systematic errors, making it difficult to extract reliable seismic wave signals. One of the key limiting factors. [0003] In near-field strong motion monitoring, both accelerometers and high-frequency GNSS can capture the energy released by large earthquakes in the low-frequency band in theory, but in practice they are insufficient in observation quality and hardware performance,...

AI Technical Summary

Problems solved by technology

[0006] (1) The seismic rotation pollution of the accelerometer observation has not been compensated, so that the weight must be lowered when it is integrated with GNSS, so that the output displacement is still interfered by the GNSS low-frequency system error;

[0007] (2) There are many data fusion strategies and researches on GNSS and accelerometers, but none of them can be extended to gyroscope data

However, the system errors of the two depend on each other's accurate translation and rotation observations, and the realization of the principle is actually self-contradictory. The root of the problem is that this classic six-degree-of-freedom instrument lacks a non- inertial check sensor

In the case of near-field strong vibration, it is difficult to overcome the system error of the instrument itself by relying only on the six-degree-of-freedom monitoring platform formed by the traditional inertial sensor, and it is not reliable in the extremely low frequency band

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