This paper proposes a message structure for the L5 GEO data signal that can support more than 90 simultaneous L1/L5 satellite corrections. The proposal is similar to the existing L1 structure with 250 bit messages sent at one Hertz. It eliminates the need for fast clock corrections. It creates a new integrity information message capable of updating the status for 91 satellites in a single messa...

Gully erosion is widespread in central China's ecologically fragile loess plateau. However, research on the monitoring and evaluation of large-scale scarce. Here, we collected 16 pairs Sentinel-1A images from rainy season, spanning April 5-October 26, 2019, subsidence then quantified its results can indirectly reflect intensity largest plateau China, Dongzhiyuan tableland, using small baseline ...

The ionosphere causes the most difficult error to mitigate in Satellite Based Augmentation Systems (SBAS). The problem has been solved for the mid latitude regions using the thin shell approximation. There, it is very accurate on quiet days and allows the augmentation system so send the information in a two dimensional grid with a five by five degree resolution. However, even during quiet days,...

Jorge Nieto and Joaquín Cosmen received their MS from the Escuela Técnica Superior de Ingenieros Aeronáuticos (Universidad Politéctnica de Madrid, Spain). Ignacio García holds MS in mathematics from the Universidad Complutense de Madrid, Spain. They joined GMV and currently work in the GNSS Unit. In particular, Mr. Cosmen is the manager of this unit. GMV has a vast experience in the satellite n...

The article presents the results of research on multi-SBAS (multi-satellite-based augmentation system) positioning in UAV (unmanned aerial vehicle) technology. For this purpose, a new solution was developed for combining position navigation from several SBAS systems. In particular case, presented linear combination algorithm is based fusion EGNOS (European geostationary overlay service) and SDC...

The growing volume of synthetic aperture radar (SAR) imagery acquired by satellite constellations creates novel opportunities and opens new challenges for interferometric SAR (InSAR) applications to observe Earth’s surface processes geohazards. In this paper, the Parallel Small BAseline Subset (P-SBAS) advanced InSAR processing chain running on Geohazards Exploitation Platform (GEP) is trialed ...

We present a Differential Synthetic Aperture Radar Interferometry (DInSAR) technique for generating displacement maps and deformation time-series by exploiting the SAR data acquired by the ERS and ENVISAT/ASAR systems. The proposed approach extends the Small Baseline Subset (SBAS) algorithm and is based on an easy but effective combination of ERS/ERS and ENVISAT/ENVISAT multilook interferograms...

Tropical peatland in Southeast Asia has undergone rapid degradation and shows large subsidence due to oxidation peat shrinkage. The measurement of those deformations is thus valuable for evaluating the condition assessing restoration. time series interferometric synthetic aperture radar (TInSAR), especially with small baseline subsets (SBAS) method, capable measuring long-term deformation. Howe...

This paper presents the application of Parallel Small Baseline Subset (P-SBAS) algorithm, provided by Geohazards Exploitation Platform for precise monitoring an earth dam's ground deformation using C-band Sentinel-1 data. The test site object this study was Kramis dam, located in Mostaganem State, Western Algeria. Among multiple advanced DInSAR techniques, SBAS is very adequate long-term displa...