Method for acquiring real-time high-precision displacement of dam through integration of GNSS and ground monitoring network

Abstract

The invention discloses a method for acquiring real-time high-precision displacement of a dam through integration of a GNSS and a ground monitoring network. The method comprises the following steps that S1: the ground monitoring network and a satellite monitoring network are established; S2: a deformation database and a displacement satellite database are converted into the displacement of the same initial state relative to the same reference system; S3: interpolation is performed on the deformation database of the dam surface of long data acquisition interval time so that a displacement database synchronized with the dam displacement satellite database is obtained; S4: noise reduction is performed on the displacement database after interpolation expansion and then data fusion is performedthrough combination of the adaptive weighted mean method and the satellite database processed by wavelet noise reduction; and S5, the data accuracy is calculated, compared and recorded and the wavelet basis is preferably selected according to the data accuracy so that the corresponding fusion displacement sequence in the S4 is obtained. Fusion calculation is performed on the two sets of databasesafter noise reduction through combination of the adaptive weighted mean method, and the obtained database sequences after fusion have the characteristics of being real-time, smooth, continuous, high-precision and reliable.

Description

technical field [0001] The invention relates to a method for obtaining real-time high-precision displacement of a dam by integrating GNSS and a ground monitoring network, and belongs to the field of dam safety monitoring. Background technique [0002] The existing ground monitoring network for surface deformation of dams is usually observed by methods such as line-of-sight method, tension line method, laser collimation method, and vertical line method. It has the characteristics of high measurement accuracy, and the accuracy in the horizontal and vertical directions is at least 0.1mm. However, on the one hand, the failure rate of this type of monitoring instrument is high, on the other hand, the monitoring frequency is low, and the frequency of manual measurement is about once a month. The measurement interval should not be too short, so the existing ground monitoring network does not have the characteristics of reliable and real-time monitoring of the displacement of the d...

AI Technical Summary

Problems solved by technology

For the existing dam surface deformation ground monitoring network, the research results of integrating the GNSS-based positioning database with the dam surface deformation ground monitoring network database have not been published yet, and the fused database can combine the data obtained by the two types of monitoring methods. The advantages of information complement each other to achieve the characteristics of dense distribution of data points and high measurement accuracy. Therefore, there is an urgent need for a method to effectively integrate the two monitoring methods with complementary advantages.

Images