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针对地表形变监测中水准测量存在的缺陷,本文在介绍小基线(SBAS)技术的原理和数据处理流程的基础上,以宁波市32景Cosmo-Sky Med影像为数据源,获取地表形变平均速率与形变特征,提出了内符合和外符合精度评价方法,并阐述了水准比对流程,为SBAS技术的应用提供参考。结果显示,SBAS技术在城市地表形变监测中可以取得毫米级精度,成果可靠,具有广阔的应用前景。
Aiming at the shortcomings of leveling measurement in surface deformation monitoring, this paper introduces the principle and data processing flow of SBAS technology, takes Cosmo-Sky Med image of 32 scenes in Ningbo as data source, Deformation characteristics are proposed, and the method of evaluating the internal and external conforming accuracy is put forward. The level matching process is expatiated, which provides a reference for the application of SBAS technology. The results show that the SBAS technology can achieve millimeter-level accuracy in urban surface deformation monitoring, the results are reliable and has broad application prospects.