Searched for: subject%3A%22Coastal%255C%2Benvironment%22
(1 - 20 of 26)

Pages

List view
Grid view
document
de Jong, A.N. (author), Schwering, P.B.W. (author), van Eijk, A.M.J. (author), Gunter, W.H. (author)
Various atmospheric propagation effects are limiting the long range performance of electro-optical imaging systems. These effects include absorption and scattering by molecules and aerosols, refraction due to vertical temperature gradients and scintillation and blurring due to turbulence. In maritime and coastal areas, ranges up to 25 km are...
article 2013
document
van Eijk, A.M.J. (author), Kusmierczyk-Michulec, J.T. (author), Piazzola, J.P. (author)
The image quality of electro-optical sensors in the (lower-altitude marine) atmosphere is limited by aerosols, which cause contrast reduction due to transmission losses and impact on the thermal signature of objects by scattering solar radiation. The Advanced Navy Aerosol Model (ANAM) aims at providing a quantitative estimate of the aerosol...
conference paper 2011
document
TNO Defensie en Veiligheid (author), Schwering, P.B.W. (author), Schutte, K. (author)
Asymmetric threat assessment from military platforms, including early detection and classification by electro-optical means, is a complicated matter. These threats can be for instance explosives-packed rubber boats, minecarrying swimmers and divers in a marine environment or terrorists, improvised explosive devices and small vehicles in land or...
conference paper 2010
document
Kusmierczyk-Michulec, J.T. (author), Schleijpen, H.M.A. (author), TNO Defensie en Veiligheid (author)
The radiation coming from a laser which operates in the coastal zone can be detected not only when a detector is placed in front of the laser beam but also when it is located outside the main beam direction. The reason is that in a real detection scheme the power collected by a detector not only comes from direct radiation but also from other...
conference paper 2009
document
TNO Defensie en Veiligheid (author), van den Broek, S.P. (author), Bouma, H. (author), Degache, M.A.C. (author), Burghouts, G.J. (author)
For naval operations in a coastal environment, detection of boats is not sufficient. When doing surveillance near a supposedly friendly coast, or self protection in a harbor, it is important to find the one object that means harm, among many others that do not. For this, it is necessary to obtain information on the many observed targets, which...
conference paper 2009
document
TNO Defensie en Veiligheid (author), de Jong, A.N. (author), Schwering, P.B.W. (author), Fritz, P.J. (author), Gunter, W.H. (author)
During the False Bay trial (June 2007), the performance of a set of three optical sensors was tested against several small surface targets in a coastal area: a hyperspectral camera, a camera with a rotating polarization filter and a high resolution camera. One objective was the validation of a contrast and clutter model for the visual spectral...
conference paper 2009
document
TNO Defensie en Veiligheid (author), Schwering, P.B.W. (author), Lensen, H.A. (author), van den Broek, S.P. (author), den Hollander, R.J.M. (author), van der Mark, W. (author), Bouma, H. (author), Kemp, R.A.W. (author)
In a harbor environment threats like explosives-packed rubber boats, mine-carrying swimmers and divers must be detected in an early stage. This paper describes the integration and use of a heterogeneous multiple camera system with panoramic observation capabilities for detecting these small vessels in the Den Helder New Harbor in the Netherlands...
conference paper 2009
document
TNO Defensie en Veiligheid (author), de Jong, A.N. (author), Schwering, P.B.W. (author), Fritz, P.J. (author)
Complementary to a measurement campaign of small surface targets in the False Bay, South Africa [1], a set-up could be arranged of atmospheric propagation experiments. This opportunity allowed us to collect another set of transmission data in a coastal area, where the environmental conditions are generally non-homogeneous and rapidly changing....
conference paper 2008
document
TNO Defensie en Veiligheid (author), van den Broek, S.P. (author), Bouma, H. (author), Degache, M.A.C. (author)
Operating in a coastal environment, with a multitude of boats of different sizes, detection of small extended targets is only one problem. A further difficulty is in discriminating detections of possible threats from alarms due to sea and coastal clutter, and from boats that are neutral for a specific operational task. Adding target features to...
conference paper 2008
document
TNO Defensie en Veiligheid (author), de Jong, A.N. (author), Schwering, P.B.W. (author), Fritz, P.J. (author)
Complementary to a measurement campaign of small surface targets in the False Bay, South Africa [1], a set-up could be arranged of atmospheric propagation experiments. This opportunity allowed us to collect another set of transmission data in a coastal area, where the environmental conditions are generally non-homogeneous and rapidly changing....
conference paper 2008
document
TNO Defensie en Veiligheid (author), Schoemaker, R.M. (author)
Sea basing operations in coastal environments require a rapid and accurate description of the physical conditions in the region. Battlespace characterization and sensor performance assist in optimizing the efficiency and safety of operations, of which the detection of targets at low level above the sea surface is all-important. The environmental...
conference paper 2007
document
Heemskerk, H.J.M. (author), TNO Defensie en Veiligheid (author)
In a coastal environment simultaneous exploitation of radar and infrared sensors and multisensor fusion can overcome the difficulties imposed by the atmospheric conditions with respect to target detection/recognition/classification by the individual sensors. To investigate the so-called radar and infrared synergism with respect to propagation in...
conference paper 2005
document
TNO Fysisch en Elektronisch Laboratorium (author), Piazzola, J. (author), Bouchara, F. (author), de Leeuw, G. (author), van Eijk, A.M.J. (author)
The performance of electro-optical systems can be substantially affected by aerosol particles that scatter and absorb electromagnetic radiation. The model that is most frequently used for the prediction of aerosols and their effect on extinction in the marine atmosphere is the US Navy Aerosol Model (NAM). However, NAM can be significantly less...
article 2003
document
TNO Fysisch en Elektronisch Laboratorium (author), de Leeuw, G. (author), Kunz, G.J. (author), Buzorius, G. (author), O`Dowd, C.D. (author)
The meteorological situation at the midlatitude coastal station of Mace Head, Ireland, is described based on observations during the New Particle Formation and Fate in the Coastal Environment (PARFORCE) experiments in September 1998 and June 1999. Micrometeorological sensors were mounted near the shore line on a small mast with a height of 3 m...
article 2002
document
TNO Fysisch en Elektronisch Laboratorium (author), Kunz, G.J. (author), de Leeuw, G. (author), Becker, E. (author), O`Dowd, C.D. (author)
A scanning backscatter lidar was used to measure the depth and structure of the coastal atmospheric boundary layer and the evolution of primary aerosol (sea spray) plumes produced by breaking waves during the New Particle Formation and Fate in the Coastal Environment (PARFORCE) campaign at the Mace Head Atmospheric Research Station (Ireland) in...
article 2002
document
Jensen, D.R. (author), Gathman, S.G. (author), Zeisse, C.R. (author), de Leeuw, G. (author), Smith, M.H. (author), Frederickson, P.A. (author), TNO Fysisch en Elektronisch Laboratorium (author)
EOPACE (electro-optical propagation assessment in coastal environments) was a 5-yr multinational and interdisciplinary effort to improve the performance assessment for electro-optical (EO) systems operating in coastal environments. The initial results of the EOPACE program include: (1) the parameterization of the surf-zone generated aerosol-size...
article 2001
document
O'Dowd, C.D. (author), Mäkela, J.M. (author), Korhonen, P. (author), Hämeri, K. (author), Väkevä, M. (author), Pirjola, L. (author), Hansson, H-C. (author), Jennings, S.G. (author), de Leeuw, G. (author), Kunz, G.J. (author), Berresheim, H. (author), Harrison, R.M. (author), Allen, A.G. (author), Viisanen, Y. (author), Kulmala, M. (author), TNO Fysisch en Elektronisch Laboratorium (author)
Understanding the formation of natural particles in the atmosphere, and their growth to radiatively active sizes, is critical to quantifying the role of anthropogenic emissions on cloud formation, climate change and public health. Only a few regions have been identified as strong natural sources of aerosols in the boundary layer: in particular,...
conference paper 2000
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
de Leeuw, G. (author), Kunz, G.J. (author), Cohen, L.H. (author), Schluenzen, H. (author), Muller, F. (author), Schulz, M. (author), Tamm, S. (author), Geernaert, G.L. (author), Hertel, O. (author), Pedersen, B. (author), Sorensen, L.L. (author), Lund, S. (author), Vignati, E. (author), Jickells, T. (author), Spokes, L. (author), TNO Fysisch en Elektronisch Laboratorium (author)
article 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
Searched for: subject%3A%22Coastal%255C%2Benvironment%22
(1 - 20 of 26)

Pages

List view
Grid view