A method for processing psi settlement monitoring results based on high-speed rail structures

Abstract

The invention discloses a PSI (Permanent Scatterer Interferometric) settlement monitoring result processing method on the basis of a high-speed rail structural body. According to the geometrical characteristics of the high-speed rail structural body and the settlement characteristics of a time-space domain of the high-speed rail structural body, PS (Permanent Scatterer) points on the high-speed rail structural body are subjected to comproportionation; the PSI settlement monitoring result processing method puts forward a measure of using an altitude correction value and a settlement slope value as indexes to carry out moving filtering and carrying out average processing on the local PS point stacking phenomenon; PS points with a large residual error on the high-speed rail structural body are removed; distribution of the PS points on the high-speed rail structural body is optimized; settlement monitoring accuracy of the high-speed rail structural body is improved. The PSI settlement monitoring result processing method comprises the following specific steps: extracting the PS points on the high-speed rail structural body; carrying out comproportionation on the PS points; applying the altitude correction values of the PS points to carry out moving filtering processing for the first time so as to remove the PS points with the abnormal altitude correction values; according to settlement rate values of the adjacent PS points, carrying out moving filtering processing for the second time so as to extract the abnormal PS points; processing the abnormal PS points; diluting the PS points which locally have the point stacking phenomenon by adopting an averaging method; respectively obtaining sequence settlement information at a random mileage point and in a random time period in the time-space domain. The PSI settlement monitoring result processing method effectively improves accuracy of a PSI settlement monitoring technology for settlement monitoring on the high-speed rail structural body.

Description

technical field [0001] The invention relates to a high-speed rail settlement monitoring technology, in particular to a technology for monitoring the settlement of a high-speed rail structure by using a PSI settlement monitoring method. Background technique [0002] In recent years, DInSAR (Difference Interferometric SAR, differential synthetic aperture radar interferometry) technology has become the most effective and commonly used method for regional subsidence monitoring. Using DInSAR technology, it is possible to use a non-contact method to monitor a certain research area on the surface in a certain period. This method is especially suitable for subsidence monitoring in surface areas. This technology is greatly affected by space-time decoherence and the atmosphere, and the monitoring accuracy is generally at the centimeter level. In order to improve the accuracy, the researchers proposed the PSI (Permanent Scatterer Interferometric SAR, permanent scatterer synthetic aper...

AI Technical Summary

Problems solved by technology

[0004] Directly extracting the PS points on the high-speed rail structure from the PSI settlement monitoring results for settlement analysis faces the following problems: (1) Due to the limited width of the high-speed rail structure, affected by the registration accuracy of the line level plane and PS points, it is easy to convert the PS points on the surface point is misselected as the PS point on the high-speed rail structure; (2) Since the PS point reflects the comprehensive reflection information of the scatterer within a pixel range, it is easy to misselect the surface PS point as the point on the structure, or the structure The PS point on the body is misjudged as the PS point on the surface, resulting in unstable monitoring results; (3) the discontinuity of the PS point on the high-speed rail structure is easy to cause errors in interpolation; (4) the high-speed rail structure There are also some low-quality PS points, which will affect the local monitoring accuracy of the high-speed rail structure; (5) The high-speed rail settlement has significant characteristics in both space and time dimensions, and it is difficult to ensure that it is difficult to select a suitable mathematical model without combining its characteristics. The accuracy of PS points on the extracted high-speed rail structure

The above problems will affect the accuracy of settlement monitoring of high-speed rail structures

[0005] At present, the settlement monitoring of high-speed rail structures based on PSI technology is in the process of research, improvement and development, and there is no method for optimizing the PSI settlement monitoring results of high-speed rail structures.

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