Experimental Study on Low-Cost Satellite-Based Geodetic Monitoring over Short Baselines

Caldera, Stefano; Realini, Eugenio; Barzaghi, Riccardo; Reguzzoni, Mirko; Sansò, F.

doi:10.1061/(asce)su.1943-5428.0000168

Cited by 48 publications

(39 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Furthermore, two experiments carried out in the Alps, provided a first, satisfactory guess of the accuracy of low-cost, single frequency receivers in landslide monitoring [15]. A recent research is presented also in [16]: in this case, the accuracy of low-cost receivers is assessed for local monitoring by processing daily sessions: accordingly to the baseline length, the final accuracy range from 1 mm (very short baseline) to 1 cm (30 km long baseline).…”

Section: Introductionmentioning

confidence: 99%

Low-Cost GNSS Receivers for Local Monitoring: Experimental Simulation, and Analysis of Displacements

Biagi

Grec

Negretti

2016

Sensors

View full text Add to dashboard Cite

The geodetic monitoring of local displacements and deformations is often needed for civil engineering structures and natural phenomena like, for example, landslides. A local permanent GNSS (Global Navigation Satellite Systems) network can be installed: receiver positions in the interest area are estimated and monitored with respect to reference stations. Usually, GNSS geodetic receivers are adopted and provide results with accuracies at the millimeter level: however, they are very expensive and the initial cost and the risk of damage and loss can discourage this approach. In this paper the accuracy and the reliability of low-cost u-blox GNSS receivers are experimentally investigated for local monitoring. Two experiments are analyzed. In the first, a baseline (65 m long) between one geodetic reference receiver and one u-blox is continuously observed for one week: the data are processed by hourly sessions and the results provide comparisons between two processing packages and a preliminary accuracy assessment. Then, a network composed of one geodetic and two u-blox receivers is set up. One u-blox is installed on a device (slide) that allows to apply controlled displacements. The geodetic and the other u-blox (at about 130 m) act as references. The experiment lasts about two weeks. The data are again processed by hourly sessions. The estimated displacements of the u-blox on the slide are analyzed and compared with the imposed displacements. All of the results are encouraging: in the first experiment the standard deviations of the residuals are smaller than 5 mm both in the horizontal and vertical; in the second, they are slightly worse but still satisfactory (5 mm in the horizontal and 13 mm in vertical) and the imposed displacements are almost correctly identified.

show abstract

Section: Introductionmentioning

confidence: 99%

Low-Cost GNSS Receivers for Local Monitoring: Experimental Simulation, and Analysis of Displacements

Biagi

Grec

Negretti

2016

Sensors

View full text Add to dashboard Cite

show abstract

“…goGPS and Bernese apply their PPP algorithms in two different ways: Bernese implements a leastsquares post-processing adjustment of all observations collected during a given time period (in this case, daily) to jointly estimate coordinates and ZTD parameters, and goGPS adopts an extended Kalman filter. It should be noted that Caldera et al (2016) already validated goGPS against Bernese with regard to precise relative positioning (Teunissen and Kleusberg 1998;Hoffman-Wellenhof et al 2001) and demonstrated that the two software packages reach the same millimeter level of accuracy. goGPS and Bernese were run using the same processing parameters where possible: GPS-only observations, ionosphere-free combination of L1 and L2 observations, 10 • for the satellites elevation cutoff, global mapping function (Böhm et al 2006), tropospheric gradient not estimated, I08.ATX PCO/PCV model, solid Earth tides model according to IERS convention, and ocean loading model FES2004.…”

Section: Experimental Setup and Data Processingmentioning

confidence: 99%

Detection of water vapor time variations associated with heavy rain in northern Italy by geodetic and low-cost GNSS receivers

Barindelli

Realini²,

Venuti

et al. 2018

Earth Planets Space

Self Cite

View full text Add to dashboard Cite

GNSS atmospheric water vapor monitoringis not yet routinely performed in Italy, particularly at the regional scale. However, in order to support the activities of regional environmental protection agencies, there is a widespread need to improve forecasting of heavy rainfall events. Localized convective rain forecasts are often misplaced in space and/ or time, causing inefficiencies in risk mitigation activities. Water vapor information can be used to improve these forecasts. In collaboration with the environmental protection agencies of the Lombardy and Piedmont regions in northern Italy, we have collected and processed GNSS and weather station datasets for two heavy rain events: one which was spatially widespread, and another which was limited to few square kilometers. The time variations in water vapor derived from a regional GNSS network with inter-station distances on the order of 50 km were analyzed, and the relationship between the time variations and the evolution of the rain events was evaluated. Results showed a signature associated with the passage of the widespread rain front over each GNSS station within the area of interest. There was a peak in the precipitable water vapor value when the heavier precipitation area surrounded the station, followed by a steep decrease (5-10 mm in about 1 h) as the rainclouds moved past the station. The smaller-scale event, a convective storm a few kilometers in extent, was not detected by the regional GNSS network, but strong fluctuations in water vapor were detected by a low-cost station located near the area of interest.

show abstract

“…Moreover, Unmanned Aerial Vehicles (UAVs) have gained popularity amongst landslide researchers, combined with photogrammetric applications [12][13][14], whilst Global Position System (GPS) surveying, even if intrinsically a point-wise technique requiring a careful selection of the points to be monitored, represents a benchmark technique in slope monitoring [15][16][17]. This also holds true considering the potential of the endless upcoming of low-cost GNSS receivers, which will probably make GNSS monitoring even more popular in the next future, due to the high-quality performances of new devices [18][19][20][21].…”

Section: Introductionmentioning

confidence: 84%

Multi-Temporal X-Band Radar Interferometry Using Corner Reflectors: Application and Validation at the Corvara Landslide (Dolomites, Italy)

et al. 2017

View full text Add to dashboard Cite

Abstract:From the wide range of methods available to landslide researchers and practitioners for monitoring ground displacements, remote sensing techniques have increased in popularity. Radar interferometry methods with their ability to record movements in the order of millimeters have been more frequently applied in recent years. Multi-temporal interferometry can assist in monitoring landslides on the regional and slope scale and thereby assist in assessing related hazards and risks. Our study focuses on the Corvara landslides in the Italian Alps, a complex earthflow with spatially varying displacement patterns. We used radar imagery provided by the COSMO-SkyMed constellation and carried out a validation of the derived time-series data with differential GPS data. Movement rates were assessed using the Permanent Scatterers based Multi-Temporal Interferometry applied to 16 artificial Corner Reflectors installed on the source, track and accumulation zones of the landslide. The overall movement trends were well covered by Permanent Scatterers based Multi-Temporal Interferometry, however, fast acceleration phases and movements along the satellite track could not be assessed with adequate accuracy due to intrinsic limitations of the technique. Overall, despite the intrinsic limitations, Multi-Temporal Interferometry proved to be a promising method to monitor landslides characterized by a linear and relatively slow movement rates.

show abstract

Experimental Study on Low-Cost Satellite-Based Geodetic Monitoring over Short Baselines

Cited by 48 publications

References 23 publications

Low-Cost GNSS Receivers for Local Monitoring: Experimental Simulation, and Analysis of Displacements

Low-Cost GNSS Receivers for Local Monitoring: Experimental Simulation, and Analysis of Displacements

Detection of water vapor time variations associated with heavy rain in northern Italy by geodetic and low-cost GNSS receivers

Multi-Temporal X-Band Radar Interferometry Using Corner Reflectors: Application and Validation at the Corvara Landslide (Dolomites, Italy)

Contact Info

Product

Resources

About