River reservoir bank deformation data automatic collection and processing method based on ground stable platform SAR

Abstract

The invention provides a river reservoir bank deformation data automatic collection and processing method based on a ground stable platform SAR, and belongs to the field of deformation monitoring. Themethod can be applied to the deformation monitoring of a river reservoir bank under the condition of complicated topography and landforms. According to the method, firstly, a GB-SAR is used for continuous observation to obtain monitoring data and to obtain an SAR original image; then, multiple images are subjected to a series of processing to obtain an interference pattern and a coherence pattern; next, an algorithm is used for extracting a coherence point; next, each pixel in the coherence pattern is subjected to phase unwrapping; next, an atmosphere phase is removed by using an atmosphere model; next, a deformation value is calculated according to the real phase of the deformation; and finally, the geocoding is performed according to the corner reflector geographical coordinate, and a coded deformation pattern is obtained. The river reservoir bank high-slope deformation monitoring technology is finally realized. The technology can be used for fast and accurately obtaining the slopedeformation information; the detection precision on the slope is improved; and the correct evaluation is made on the slope stability.

Description

technical field [0001] The invention belongs to the field of deformation monitoring, and in particular relates to a method for automatically collecting and processing deformation data of a river basin reservoir bank based on a ground stabilization platform SAR. Background technique [0002] Ground-based SAR is a kind of imaging radar. While measuring the distance, it can also obtain two-dimensional images based on the active imaging method of microwave detection to generate images. Since the late 1990s, many scholars at home and abroad have devoted themselves to using ground-based interferometric technology to monitor buildings. thing. In recent years, ground-based SAR has received special attention and has been widely used in the field of monitoring. (Long Sichun, 2015) [0003] In the fields of water conservancy, civil engineering, transportation, etc., for high slope engineering, slope stability has always been a key issue in research. Landslides occur frequently at ho...

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Problems solved by technology

However, the geodetic method has a large workload, poor continuous observation performance, and low measurement efficiency; the error of GPS measurement is larger than that of the total station, and the GPS signal is unstable in some areas, which cannot meet the monitoring requirements; close-range photogrammetry may There will be large system errors, which will affect the monitoring results

[0007] (3) The remote sensing observation method includes spaceborne SAR monitoring, airborne SAR monitoring and ground-based SAR monitoring. Compared with spaceborne SAR and airborne SAR, ground-based SAR is smaller in size, easy to carry, and easy to install in the field environment. It is easily affected by the harsh environment, but the current SAR technology based on the ground stable platform applied to the river basin reservoir bank is not perfect enough, and the number of coherent points selected is small, which affects the monitoring accuracy; on the other hand, the existing technology cannot ensure Data Processing System Reliability

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