Determination of Precise Geoidal Height by GPS Observations in and around Sakurajima Volcano, Japan

This paper presents a precise and fast method of ambiguity resolution (PREFMAR) for frequencies L1/E1 and L5/E5a of GPS/GALILEO data. The developed method is designed for precise and fast determination of ambiguities in GNSS phase observations. Ambiguities are chosen based on mathematical search functions. The fact that no variance–covariance matrix (VC matrix) with a so-called float solution is needed proves the innovativeness of the developed method. The developed method enables determination of the ambiguities for short baseline double-difference (DD) observations. The presented algorithms for the developed method enable unique and reliable calculation of the ambiguity if the actual errors of code measurements of DD observations are less than 0.38 m and the relative errors of phase observations are in the range of ±3 cm. The paper presents both mathematical derivations of the functions used in the PREFMAR and numerical calculations based on real double-difference GPS observations (L1-L5). The elaborated algorithms can be easily implemented into GNSS receivers or mobile phones. Therefore, they can be widely used in many geoscience applications, as well as in precise GPS/GALILEO navigation.

Download Full-text

Determination of underground mining induced displacements using GPS observations in Zonguldak-Kozlu Hard Coal Basin

International Journal of Coal Geology ◽

10.1016/j.coal.2011.08.006 ◽

2012 ◽

Vol 89 ◽

pp. 62-69 ◽

Cited By ~ 32

Author(s):

Eray Can ◽

Şenol Kuşcu ◽

Cetin Mekik

Keyword(s):

Underground Mining ◽

Hard Coal ◽

Coal Basin ◽

Gps Observations

Download Full-text

Deformation in Nisyros volcano (Greece) using differential radar interferometry

Bulletin of the Geological Society of Greece ◽

10.12681/bgsg.17267 ◽

2001 ◽

Vol 34 (4) ◽

pp. 1587 ◽

Cited By ~ 9

Author(s):

I. S. PARCHARIDIS ◽

E. LAGIOS

Keyword(s):

High Resolution ◽

Aegean Sea ◽

Radar Interferometry ◽

Differential Gps ◽

Interferometric Phase ◽

Differential Radar Interferometry ◽

Differential Interferogram ◽

Gps Observations

Nisyros Volcano located at the southeastern Aegean Sea (Greece) has recently shown (1996-97) a high seismic activity, associated with a significant deformation has determined by DGPS measurements. The determination of the overall deformation of the island was also attempted by Differential Radar Interferometry (DInSAR). The DInSAR analysis has been applied using the ERS-2 satellite data, covering the period 1996-1999. The removal of the interferometric phase related to the topography has been done using an external high resolution DEM. Two areas of the island show a good coherence, the southwestern and the eastern part. Almost two interferometric fringes were respectively recognized and evaluated. These two zones coincide with the main tectonic fractures of the island. The time separation and resolution, which consist important factors, for the extraction of the effective information and the quality of the finally produced differential interferogram, seem however that influence very slight its accuracy. The deformation outlined by the interferogram is compatible with the existing differential GPS observations.

Download Full-text