GNSS elevation datum establishment method and system fused with land subsidence

By combining GNSS and InSAR technologies, a continuous dynamic settlement model is formed, which solves the problem of multiple calibration points in the settlement area and long release period of elevation benchmarks, and realizes dynamic maintenance and monitoring of high-precision elevation benchmarks.

CN120468889APending Publication Date: 2025-08-12TIANJIN SURVEY DESIGN INST GRP CO LTD
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Patent Information

Application Number
CN202510887994.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-30
Publication Date
2025-08-12

AI Technical Summary

Technical Problem

The problems of multiple calibrations and long release cycles of elevation references at the level points in the settlement area in the prior art have affected the project continuity and the fixed speed during user use.

Method used

Combined with GNSS and InSAR technology, GNSS static observation is performed by selecting uniformly distributed level points, using the CORS reference station network and IGS station for baseline solution, and a time series differential interference map set is generated for atmospheric tropospheric delay correction, and fusing the settlement data to form a continuous dynamic settlement model to achieve high-precision elevation benchmark maintenance.

Benefits of technology

Effectively reduce multiple measurements in the field, realize dynamic ground settlement monitoring and high-precision elevation benchmark maintenance, solve the problem of repeated verification in the settlement area, and improve the continuity of the project and user experience.

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Abstract

The invention provides a GNSS elevation datum establishing method and system fused with land subsidence. The GNSS elevation datum establishing method comprises the steps that a leveling point of a land subsidence area is selected for GNSS static observation; selecting a CORS base station network in the same observation time period as the GNSS, and calculating to obtain the geodetic height of the benchmark; according to the benchmark geodetic height, a benchmark real-time benchmark elevation and a benchmark settlement amount are obtained; generating a time sequence differential interference image set according to the InSAR image data, and performing atmospheric troposphere delay correction on the differential interference image set by using the observation data of the CORS base station network in the same time period to obtain the surface subsidence amount and the surface subsidence rate of the area; carrying out settlement data fusion on the benchmark settlement volume and the area ground settlement volume; and calculating to obtain the leveling elevation of the to-be-estimated point in the operation area. The continuous dynamic settlement model is formed by combining the GNSS benchmark and the INSAR technology, multiple measurement in the field is reduced, and the high-precision elevation datum is maintained.
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