Subway subgrade structure monitoring method and device based on foundation InSAR

Abstract

The embodiment of the invention provides a subway subgrade structure monitoring method and device based on foundation InSAR. The method comprises the steps of using a radar sensor for repeatedly observing a target area on a linear scanning slide rail, and obtaining a synthetic aperture radar SAR image in about 10 seconds; matching image elements representing the same object in the target region inthe two SAR images to the same position, carrying out image registration; subjecting an interference image pair after image registration to conjugate multiplication (as shown in the description) to obtain an interference phase graph; carrying out noise filtering processing on the obtained coherent graph gamma; carrying out phase unwrapping on the coherent graph gamma subjected to noise filteringprocessing; carrying out atmospheric correction on the coherent image gamma subjected to phase unwrapping to obtain a deformation graph of the target area; carrying out geocoding on the deformation graph of the target area under the radar coordinate system, projecting to the geographic coordinate system, and obtaining a geographic coded deformation graph. High-precision and continuous deformationmonitoring of the whole area of the subway elevated and roadbed structure can be implemented under the extreme weather conditions or long distances (4Km) range.

Description

technical field [0001] The invention relates to the field of engineering measurement, in particular to a method and device for monitoring a subway foundation structure based on foundation InSAR. Background technique [0002] It is necessary to monitor the deformation of the subway structure during the construction of crossing and adjacent subway elevated and subgrade projects, so as to timely understand the structural deformation of the existing subway and ensure the safety of the existing subway structure and train operation. [0003] During the operation of the train, in order to ensure the safe operation of the train, it is necessary to timely understand the deformation of the subway structure within the scope of construction influence. The non-contact remote automatic monitoring system can meet the deformation monitoring problem during the operation of the train. The current automatic monitoring system mainly uses the static level system and the measuring robot system. ...

AI Technical Summary

Problems solved by technology

[0005] (1) The measurement method of traditional subway elevated and subgrade structures is discrete, and can only reflect the overall deformation of the structure through point data;

[0006] (2) The measurement methods of the traditional subway elevated and subgrade structures are affected by the surrounding environment and their own characteristics, so long-distance monitoring cannot be carried out. The longest monitoring distance is about 300m, which cannot meet the monitoring requirements under special conditions;

[0007] (3) The traditional measurement methods of traditional subway elevated and subgrade structures are difficult to achieve all-day real-time monitoring under extreme conditions. For example, the total station is an optical measuring instrument, which is difficult to carry out in foggy or rainy days; The impact is large, and it is difficult to ensure the monitoring accuracy when the temperature difference is large

[0008] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: high-precision and continuous deformation monitoring problems in the entire area of ​​the subway elevated and subgrade structures under severe extreme weather or within a long distance (4km) range , those skilled in the art urgently need to solve

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