With climate change and the increment of human activities, global permafrost is undergoing degradation, threatening the stability of engineering and the ecological environment of the permafrost region. With the advantages of all-day, all-weather, wide-coverage, and high-accuracy monitoring, synthetic aperture radar interferometry (InSAR) is becoming a substantial tool for permafrost monitoring, and many studies with InSAR in permafrost regions have been conducted in the recent 20 years. In this article, the basic principles of time–series InSAR are introduced first. Then, the development and applications of InSAR in permafrost, such as the coherence analysis of permafrost ground surface, the deformation of permafrost and infrastructure, and active layer thickness (ALT) retrieval, are given. Next, the existing problems, including temporal decorrelation, atmospheric delay, deformation models, and the effect of soil moisture and phase unwrapping (PU), are discussed.

中文翻译：

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多年冻土区卫星合成孔径雷达干涉测量应用回顾：现状、挑战和趋势

随着气候变化和人类活动的增加，全球多年冻土正在退化，威胁着多年冻土区工程的稳定性和生态环境。合成孔径雷达干涉仪（InSAR）凭借全天、全天候、大覆盖、高精度监测的优势，正在成为多年冻土监测的重要工具，在多年冻土区开展了多项InSAR研究。最近20年。本文首先介绍时间序列 InSAR 的基本原理。然后，介绍了InSAR在多年冻土中的发展和应用，如多年冻土地表的相干性分析、多年冻土与基础设施的变形、活动层厚度（ALT）反演等。其次，存在的问题，