Foundation SAR monitoring power transmission tower deformation monitoring method for artificial corner reflector

Abstract

The invention provides a foundation SAR monitoring power transmission tower deformation monitoring method for an artificial corner reflector. The method comprises the following steps of acquiring foundation SAR time sequence image data of a monitoring area comprising a power transmission tower and a reference point corner reflector, measuring geographic coordinates of a tower CR and a reference point CR, and inputting the geographic coordinates as initial data into a tower CR point phase time sequence analysis software module; a ground-based SAR being utilized to align with an artificial corner reflector fixed on a power transmission tower for scanning to obtain a time sequence SAR sequence image, a phase sequence of a pixel where a CR target is located being extracted from the time sequence image by utilizing a geometric positioning method, and then a time sequence phase result of the corner reflector being obtained by adopting a three-dimensional space-time phase unwrapping method for monitoring deformation of the tower. A daily period thermal expansion model, an atmospheric error model, a breeze vibration model, a phase jump detection algorithm and a coherence iterative analysis technology are introduced into CR data processing to achieve accurate processing of the deformation phase of an iron tower CR point.

Description

technical field [0001] The invention relates to the technical field of aperture radar remote sensing, in particular to a ground-based SAR monitoring method of an artificial corner reflector for monitoring the deformation of a power transmission tower. Background technique [0002] In recent years, the construction of transmission lines in my country has been accelerating, especially the construction scale of ultra-high voltage transmission lines has continued to grow. As of the end of 2018, the total length of transmission lines of 110 kV and above was 1.0334 million kilometers. The geological environment of the areas where high-voltage transmission lines pass is complex and diverse, and disaster weather and hidden dangers of geological disasters affect the safe operation of transmission lines. At present, the monitoring of power grid operation status mainly includes sensor online monitoring, manual inspection, drone inspection, helicopter inspection, robot inspection, infra...

AI Technical Summary

Problems solved by technology

At present, the monitoring of power grid operation status mainly includes various monitoring methods such as online sensor monitoring, manual inspection, drone inspection, helicopter inspection, robot inspection, infrared imaging thermometer, etc. These monitoring technologies are affected by geological disasters in transmission towers. There are still deficiencies in the monitoring of the slow and small deformation and the tilt change of the iron tower, and it is difficult to meet the needs of high precision, non-contact, and remote telemetry

[0003] In recent years, ground-based SAR technology has been successfully applied to real-time monitoring and early warning of landslide deformation. However, due to the problem of image resolution and the scattering characteristics of tower targets, most transmission towers are difficult to be remotely identified and monitored by ground-based SAR equipment.

By arranging artificial corner reflectors on some large buildings, relevant researchers have also been able to use ground-based SAR technology to carry out deformation monitoring of large bridges and super high-rise buildings. , it is also difficult to simply transplant these technologies for deformation monitoring. The main factor is that it is difficult to accurately identify and locate iron tower targets from ground-based SAR images when they are far away, and it is necessary to additionally eliminate the physical characteristics of the iron tower target itself. (such as thermal expansion and the influence of breeze vibration), the error phase, etc.

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