Investigation of Integrated Twin Corner Reflectors Designed for 3-D InSAR Applications

Abstract

There are potentially dangerous areas where InSAR technology cannot be applied routinely in the absence of proper persistent or distributed scatterers. Here, we planned and investigated the use of truncated trihedral triangle corner reflectors (CRs) oriented to ascending and descending directions for Sentinel-1 orbit, which were mounted on the optimal concrete basement including an additional global navigation satellite system (GNSS) adapter. These integrated benchmarks were designed to produce a signal-to-clutter ratio of about 100 (i.e., 20 dB). The mechanical design allows optimal orientation of the reflectors and resistance against dynamic effects. We investigated 1:5 models of the CRs and integrated benchmarks in an anechoic chamber to estimate the effects of truncation and the interference of the twin reflectors. The main effect of the interference is the asymmetric monostatic radar cross section, which can be neglected. The integrated benchmarks were also investigated in two recent landslide areas in Hungary using Sentinel-1 single look complex (SLC) scenes, which confirmed that the preliminary requirements can be met.

Monitoring Strategy of Geological Hazards Using Integrated Three-dimensional InSAR and GNSS Technologies with Case Study

“…To compensate the still present fast decorrelation in time of Sentinel-1 images caused by the environment, integrated geodetic benchmarks (IBs) were designed and installed at the study area. The theoretical and practical investigations of IBs are presented in Bányai et al [38]. The 1 m 2 reinforced concrete basement of IBs holds truncated trihedral triangle corner reflectors (oriented to both ASC and DSC directions), reference adapter for geodetic/ GPS measurements and other marks to control the possible tilt of the IBs at moving areas (Fig.…”

Maden Sahalarında Köşe Reflektör (CR) Tesisi ve Sabit Saçıcı (PS) Kontrolü

“…Literatürde, köşe reflektör geometri parametreleri ve PSInSAR tekniğine katkılarıyla ilgili yayınlara daha sık olarak rastlanılmaktadır [12][13][14][15][16][17][18][19][20]. Köşe reflektörler uydu geçiş güzergâhına uygun bir şekilde konumlandırılarak uydu sinyallerini geri yansıtma temeli üzerine kurgulanmıştır (Şekil 1).…”

Integration of Sentinel-1 Interferometry and GNSS Networks for Derivation of 3-D Surface Changes

“…Precise geodetic levelling and total station measurements are carried out regularly to determine the relative positions of the two-phase centers and other four geodetic marks with respect to the GNSS reference mark of IBs [5]. The changes between two measurements are used to estimate the tilt of the IBs, which may be significant, e.g.…”

“…1). The mechanical design, electromagnetic investigations and practical test of the IBs are described in [5].…”