Abstract
Differential synthetic aperture radar interferometry (DInSAR) is a remote sensing technique to monitor ground deformation using repeat-pass data and suitable processing methods. Different platforms have been used to acquire DInSAR data such as space-borne, air-borne, car-mounted, and ground-based SAR systems. Space-borne SAR systems are relatively mature, but air-borne and other systems have attracted increasing interest of the remote sensing community due to their operational flexibility and observation capabilities. In this paper, a new InSAR platform is proposed for the deformation monitoring of reservoir slopes. The shipborne InSAR system uses frequency modulated continuous wave (FMCW) technology with one-transmit-dual-receive configuration. First, we describe the data acquisition process at the Lancang River Bank in October 2019. Subsequently, we present the imaging and interferometric capabilities of the new shipborne InSAR system. Moreover, we analyze the acquired radar data and present an assessment of the quality of the single look complex (SLC) SAR imagery and interferometric products. We focus on the influence of platform stability and baseline bias. Finally, we compare the calculated deformation with the measured deformation obtained from corner reflectors deployed in the monitored area. A line-of-sight error within 2cm is obtained. This paper proposes a novel solution for deformation monitoring of reservoir slopes and a new approach for InSAR applications.
Highlights
Due to the complex geological structure of river slopes, geologic disasters frequently occur, posing a significant threat to the safe operation of hydropower projects [1]
This paper proposes a novel solution for deformation monitoring of reservoir slopes and a new approach for InSAR applications
Differential synthetic aperture radar interferometry (DInSAR) using radar sensors mounted onboard different platforms has become an established technique for detecting and monitoring deformation of the earth’s surface, as well as
Summary
Due to the complex geological structure of river slopes, geologic disasters frequently occur, posing a significant threat to the safe operation of hydropower projects [1]. Fast and effective deformation monitoring of reservoir slopes has become a key concern [2]. Differential synthetic aperture radar interferometry (DInSAR) using radar sensors mounted onboard different platforms has become an established technique for detecting and monitoring deformation of the earth’s surface, as well as. Space-borne interferometry with a large spatial coverage has been used extensively for monitoring ground-motion with good success [4]–[9]. This method is very efficient, the use of space-borne SAR data has several drawbacks, namely, phase artifacts caused by atmospheric effects and very low coherence due to long data acquisition intervals and the short radar wavelength of the sensor [10].
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