21 research outputs found
Multipath-assisted maximum-likelihood indoor positioning using UWB signals
Multipath-assisted indoor positioning (using ultrawideband signals) exploits the geometric information contained in deterministic multipath components. With the help of a-priori available floorplan information, robust localization can be achieved, even in absence of a line-of-sight connection between anchor and agent. In a recent work, the Cramér-Rao lower bound has been derived for the position estimation variance using a channel model which explicitly takes into account diffuse multipath as a stochastic noise process in addition to the deterministic multipath components. In this paper, we adapt this model for position estimation via a measurement likelihood function and evaluate the performance for real channel measurements. Performance results confirm the applicability of this approach. A position accuracy better than 2.5 cm has been obtained in 90% of the estimates using only one active anchor at a bandwidth of 2GHz and robustness against non-line-of-sight situations has been demonstrated
Optimiser la modélisation de l’écoulement des eaux pluviales pour la gestion des inondations en milieu urbain avec des ensembles de prévisions de radar à court terme (Nowcasts)
An integrated marine data collection for the German Bight – Part 2: Tides, salinity, and waves (1996–2015)
Marine spatial planning requires reliable data for, e.g., the design of
coastal structures, research, or sea level rise adaptation. This task is
particularly ambiguous in the German Bight (North Sea, Europe) because a
compromise must be found between economic interests and biodiversity since
the environmental status is monitored closely by the European Union. For
this reason, we have set up an open-access, integrated marine data
collection for the period from 1996 to 2015. It provides bathymetry, surface
sediments, tidal dynamics, salinity, and waves for the German Bight and is of
interest to stakeholders in science, government, and the economy. This part
of a two-part publication presents data from numerical hindcast simulations
for sea surface elevation, depth-averaged current velocity, bottom shear
stress, depth-averaged salinity, wave parameters, and wave spectra. As an
improvement to existing data collections, our data represent the variability
in the bathymetry by using annually updated model topographies. Moreover, we
provide data at a high temporal and spatial resolution (Hagen et al.,
2020b); i.e., numerical model results are gridded to 1000 m at 20 min
intervals (https://doi.org/10.48437/02.2020.K2.7000.0004). Tidal characteristic
values (Hagen et al., 2020a), such as tidal range or ebb current velocity,
are computed based on numerical modeling results (https://doi.org/10.48437/02.2020.K2.7000.0003). Therefore, this integrated marine data
collection supports the work of coastal stakeholders and scientists, which
ranges from developing detailed coastal models to handling complex natural-habitat problems or designing coastal structures.</p
Extension of the ProMaiDes software package to flood risk calculation for coastal regions within the HoRisk-project
Extension of the ProMaiDes software package to flood risk calculation for coastal regions within the HoRisk-project
Sea State, Tides
This chapter contains sections titled: * Sea State * Tides * Acknowledgment * Reference