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Qu'est-ce (qui) est GNSS reflectometry - définition
GNSS reflectometry
EARTH OBSERVATION TECHNOLOGY
Gps reflectometry; GPS reflectometry; GNSS-R
GNSS reflectometry (or GNSS-R) involves making measurements from the reflections from the Earth of navigation signals from Global Navigation Satellite Systems such as GPS. The idea of using reflected GNSS signal for earth observation became more and more popular in the mid-1990s at NASA Langley Research Center and is also known as GPS reflectometry.
Neutron reflectometry
Neutron reflectometry is a neutron diffraction technique for measuring the structure of thin films, similar to the often complementary techniques of X-ray reflectivity and ellipsometry. The technique provides valuable information over a wide variety of scientific and technological applications including chemical aggregation, polymer and surfactant adsorption, structure of thin film magnetic systems, biological membranes, etc.
GNSS positioning calculation
![Essentially, the solution, \scriptstyle (\hat{\boldsymbol{r}}_{\text{rec}},\, \hat{t}_{\text{rec}}), is the intersection of [[light cone]]s.](https://commons.wikimedia.org/wiki/Special:FilePath/Light cones.svg?width=200 "Essentially, the solution, \scriptstyle (\hat{\boldsymbol{r}}_{\text{rec}},\, \hat{t}_{\text{rec}}), is the intersection of [[light cone]]s.")
![The [[posterior distribution]] of the solution is derived from the product of the distribution of propagating spherical surfaces. (See [http://commons.wikimedia.org/wiki/File:Evolution_light_cones.gif animation].)](https://commons.wikimedia.org/wiki/Special:FilePath/Evolution light cones 0.gif?width=200 "The [[posterior distribution]] of the solution is derived from the product of the distribution of propagating spherical surfaces. (See [http://commons.wikimedia.org/wiki/File:Evolution_light_cones.gif animation].)")
The global navigation satellite system (GNSS) positioning for receiver's position is derived through the calculation steps, or algorithm, given below. In essence, a GNSS receiver measures the transmitting time of GNSS signals emitted from four or more GNSS satellites (giving the pseudorange) and these measurements are used to obtain its position (i.
