Pages
- 1
- 2
- document
-
de Wit, J.J.M. (author), van Rossum, W.L. (author)A sensor network has been developed consisting of four RF nodes that automatically set up a network organization and synchronize wirelessly. In the system bistatic backscatter and forward scatter radar measurements are combined. For detection of small and slow targets, like humans, suppression of the background including the direct signals...conference paper 2018
- document
-
van Rossum, W.L. (author), de Wit, J.J.M. (author)Through-wall radar allows for remote intelligence of building interiors including stand-off detection and tracking of persons inside a building. However, reliable radar tracking of people inside a building is not trivial. Conventional, monostatic through-wall radar measures the backscatter of moving people. The backscatter from a human is...article 2017
- document
-
Cristol, X. (author), Jespers, S. (author), Chalindar, B. (author), Juhel, B. (author), Dybedal, J. (author), Eidem, E.J. (author), Ivansson, S. (author), van Vossen, R. (author), Ainslie, M.A. (author), Andersson, B.L. (author), Colin, M.E.G.D. (author), Pihl, J. (author)The European Defence Agency project RUMBLE-2 (ref.[1]) offered the opportunity for investigating experimentally acoustic reverberation at about 1.kHz, under grazing incidence (less than about 20°), from very porous clayey seafloors of a continental shelf (mean grain size spanning from about 7 to 10 in units); the instrument was an operational,...conference paper 2012
- document
-
Abrahamsson, L. (author), Andersson, B.L. (author), Ivansson, S. (author), Pihl, J. (author), Chalindar, B. (author), Cristol, J.X. (author), Juhel, B. (author), Eidem, E.J. (author), Dybedal, J. (author), Olsen, G.K. (author), Ainslie, M.A. (author), Benders, F.P.A. (author), Colin, M.E.G.D. (author), van Vossen, R. (author)An operational low-frequency active sonar system has been used in the EDA (European Defence Agency) project Rumble-2 to collect reverberation data at sea trials in the North Sea. Using a fast ray model for the forward computations, the reverberation data are inverted to determine bottom parameters: Lambert back-scattering parameter μ and sound...conference paper 2012
- document
-
van Vossen, R. (author), Ainslie, M.A. (author)Reliable predictions of sea-surface backscattering strength are required for sonar performance modeling. These are, however, difficult to obtain as measurements of sea-surface backscattering are not available at small grazing angles relevant to low-frequency active sonar (1-3 kHz). Accurate theoretical predictions of scattering strength require...article 2011
- document
-
Simons, D.G. (author), Snellen, M. (author), Ainslie, M.A. (author), TNO Defensie en Veiligheid (author)Sound backscattered from the seabed has been measured in a 10 × 10-nmi2 region of the North Sea, characterized by a variety of bottom types, including mud, sand, and gravel. The backscattering strength measurements are made by a forward-looking sonar, operating at 100 kHz and tilted at an angle of 30° from the horizontal. Fifty bottom-grab...article 2007
- document
-
Franke, C. (author), Pennock, G.M. (author), Drury, M.R. (author), Engelmann, R. (author), Lattard, D. (author), Garming, J.F.L. (author), von Dobeneck, T. (author), Dekkers, M.J. (author), TNO Bouw en Ondergrond (author)In paleomagnetic and environmental magnetic studies the magnetomineralogical identification is usually based on a set of rock magnetic parameters, complemented by crystallographic and chemical information retrieved from X-ray diffraction (XRD), (electron) microscopy or energy dispersive spectroscopy (EDS) of selected samples. While very useful,...article 2007
- document
-
TNO Industrie en Techniek (author), Vries, J.de (author), Laan, E.C. (author), Hoogeveen, R.W.M. (author), Jongma, R.T. (author), Aben, U. (author), Visser, H. (author), Boslooper, E.C. (author), Saari, H. (author), Dobber, M.R. (author), Veefkind, J.P. (author), Kleipool, Q. (author), Levelt, P.F. (author)TROPOMI is a nadir-viewing grating-based imaging spectrograph in the line of OMI and SCIAMACHY. TROPOMI is part of the ESA Candidate Core Explorer Mission proposal TRAQ and also of the CAMEO satellite proposed for the US NRC decadal study. A TROPOMI-like instrument is part of the ESA/EU Sentinel 4&5 pre-phase A studies. TROPOMI covers the OMI...conference paper 2007
- document
-
Nekrasov, A. (author), Hoogeboom, P. (author), TNO Defensie en Veiligheid (author)A Ka-band backscatter model and an algorithm for measurement of the wind speed and direction over the sea surface by a frequency-modulated continous-wave radar demonstrator system operated in scatterometer mode have been developed. To evaluate the proposed algorithm, a simulation of the wind vector retrieval has been performed.article 2005
- document
-
de Jong, A.N. (author), Cohen, L.H. (author), Moerman, M.M. (author)Scattering by atmospheric aerosols is one of the environmental parameters determining the range performance of optical and infrared sensors. Extinction of the target contrast along the path due to scattering is difficult to estimate in real operational conditions due to uncertainties in the size distribution of the particles, their constitution...conference paper 2004
- document
-
Melief, H.W. (author), Greidanus, H.S.F. (author), Hoogeboom, P. (author), van Genderen, P. (author), TNO Fysisch en Elektronisch Laboratorium (author)A model for describing radar sea clutter is proposed. It consists of two parts, an oceanographic and an electromagnetic one. The former contains swell, small capillary and gravity waves as well as breaking wave events. The latter combines ray tracing, Bragg scattering and the Method of Moments. It is shown that the combination of the two models...conference paper 2003
- document
-
TNO Fysisch en Elektronisch Laboratorium (author), Schleijpen, H.M.A. (author)This paper gives an overview of the activities on research and development in the technology area for landmine detection in the Netherlands. The main players, their projects and the long term and short term project goals are presented. The projects cover the range from military applications to humanitarian demining. In the "conventional"...conference paper 2003
- document
-
TNO Fysisch en Elektronisch Laboratorium (author), Kunz, G.J. (author), de Leeuw, G. (author)A scanning backscatter lidar, operating at a wavelength of 1.06 um, was used to measure the volume backscatter coefficient of coastal aerosol at the Mace Head Research Station on the west coast of Ireland during the PARFORCE experiments in September 1998 and June 1999. Lidar measurements under a fixed elevation angle at fixed time intervals...conference paper 2002
- document
-
Greidanus, H.S.F. (author), Melief, H.W. (author), Hoogeboom, P. (author), van Genderen, P. (author), TNO Fysisch en Elektronisch Laboratorium (author)The non-stationary nature of high resolution grazing angle X-band radar backscatter of the sea surface is investigated. The temporal behavior is modeled as resulting from a fast and a slow process, and statistical parameters are derived for both processes separately. It is found that the fast process is consistent with an underlying complex...conference paper 2001
- document
-
Jordan, M. (author), Wash, C. (author), Durkee, P.H. (author), Veefkind, J.P. (author), de Leeuw, G. (author), Smith, M.H. (author), Hill, M.K. (author), TNO Fysisch en Elektronisch Laboratorium (author)Knowledge of the coastal MABL for the entire battlespace is critical for modern Navy operations. To support modern weapon and sensor systems, quantitative assessment of a number of MABL properties are needed. They include: optical depth, boundary layer depth, sea surface temperature, and surface layer temperature and moisture. These needs are...conference paper 1998
- document
-
TNO Fysisch en Elektronisch Laboratorium (author), Wash, C. (author), Jordan, M. (author), Durkee, P.H. (author), Veefkind, J.P. (author), de Leeuw, G. (author)Coastal Marine Atmospheric Boundary Layer (MABL) aerosol optical depth is estimated from satellite data and compared with ship-based aerosol and lidar backscatter measurements, aircraft-measured aerosol, and rawinsonde data during the EO Propagation Assessment in Coastal Environments (EOPACE) Intense Observing Period (IOP) during April 1996. In...conference paper 1998
- document
-
Kunz, G.J. (author), TNO Fysisch en Elektronisch Laboratorium (author)Wind speeds and wind directions are measured remotely using an incoherent backscatter lidar system operating at a wavelength of 1.06 mm with a maximum repetition rate of 13 Hz. The principle of the measurements is based on following detectable atmospheric structures, which are transported by the wind (Taylor’s hypothesis). The characteristic...article 1996
- document
-
Kunz, G.J. (author), TNO Fysisch en Elektronisch Laboratorium (author)Single-scatter lidar signals carry information on the spatial atmospheric backscatter coefficient, attenuated by the path-integrated extinction. Assuming that the relationship between the backscatter and the extinction is known, the inverted extinction profile and the path-integrated extinction are uniquely related to the input boundary value....article 1996
- document
-
van den Broek, A.C. (author), Rijckenberg, G.J. (author), Davidson, M. (author), Freeman, A. (author), TNO Fysisch en Elektronisch Laboratorium (author)We compared polarimetric C- and L-band and ground truth data from bare soil, young wheat and mature maize fields of the agricultural test site Flevoland in the Netherlands collected during the SIR-C campaign in April and October 1994. We find that the L-band is more sensitive to the soil roughness than the C-band. In particular L-band HH gives...conference paper 1995
- document
-
Rijckenberg, G.J. (author), van den Broek, A.C. (author), Lemoine, G.C. (author), TNO Fysisch en Elektronisch Laboratorium (author)We present here a technique for a decomposition of polarimetric data into a vegetation, a soil and a vegetation-soil component. Results are given for polarimetric L-and C-band data of winter wheat, obtained during the MAC'91 campaign at the Dutch Flevoland testsiteconference paper 1995
Pages
- 1
- 2