نتایج جستجو برای: geodetic satellite
تعداد نتایج: 83873 فیلتر نتایج به سال:
Abstract The accurate knowledge of the Earth’s orientation and rotation in space is essential for a broad variety scientific societal applications. Among others, these include global positioning, near-Earth deep-space navigation, realisation precise reference time systems as well studies geodynamics change phenomena. In this paper, we present refined strategy processing combining Very Long Base...
As a frequently-occurred phenomenon in the high-latitude region, ionospheric scintillations affect stable service of positioning navigation and timing Global Navigation Satellite System (GNSS), calling for an urgent need monitoring accurately. The usually adopts special type receiver, called scintillation receiver (ISMR), which cannot cover whole region due to its loss distribution. Geodetic re...
Abstract Geodetic observation methods, e.g., satellite gravimeter and Global Navigation Satellite System (GNSS), are mainly used for determining the Earth’s gravity field reference system. However, many efforts have been made to adopt mentioned methods estimating hydrological dynamics. The of Gravity Recovery Climate Experiment its Following-On missions (GRACE/GRACE-FO) proven capture terrestri...
Sea level is traditionally observed with tide gauges (TG). These measurements are relative to the Earth’s crust. To improve the understanding of sea level changes it is necessary to perform measurements with respect to the Earth’s center of mass. This can be done with satellite techniques. Global Navigation Satellite System (GNSS) is a tool that can solves several hundred kilometers vectors wit...
For airborne surveys, direct georeferencing has become the primary source for EOPs (Exterior Orientation Parameters) determination since integrated GPS/INS (Global Positioning System/Inertial Navigation System) systems were introduced. However, there is still need for alternative indirect georeferencing since there are remote, inaccessible areas that lack a geodetic infrastructure and thus GPS/...
A new method for dynamic measurement of deflections of the vertical (DOV) is proposed in this paper. The integration of an inertial navigation system (INS) and global navigation satellite system (GNSS) is constructed to measure the body's attitude with respect to the astronomical coordinates. Simultaneously, the attitude with respect to the geodetic coordinates is initially measured by a star s...
چکیده ندارد.
A set S of vertices of a connected graph G is convex, if for any pair of vertices u, v ∈ S , every shortest path joining u and v is contained in S . The convex hull CH(S ) of a set of vertices S is defined as the smallest convex set in G containing S . The set S is geodetic, if every vertex of G lies on some shortest path joining two vertices in S, and it is said to be a hull set if its convex ...
Acknowledgements The writing of these guidelines has involved a myriad of resources. Besides the author's personal experience with different manufacturers' hardware and software for classical real-time (RT) Global Navigation Satellite Systems (GNSS) positioning for over a dozen years, the internet was the primary source for definitive documents and discussions. Additionally, many agencies have ...
Three-dimensional surface displacement field associated with the 25 April 2015 Gorkha, Nepal earthquake is derived from an integration of Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) measurements, with an extended SISTEM (Simultaneous and Integrated Strain Tensor Estimation From Geodetic and Satellite Deformation Measurements) approach (ESISTEM) proposed ...
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