Institution
Swedish Defence Research Agency
Government•Stockholm, Sweden•
About: Swedish Defence Research Agency is a government organization based out in Stockholm, Sweden. It is known for research contribution in the topics: Radar & Synthetic aperture radar. The organization has 1413 authors who have published 2731 publications receiving 56083 citations. The organization is also known as: Totalförsvarets forskningsinstitut.
Papers published on a yearly basis
Papers
More filters
••
05 Oct 2006TL;DR: The field trials show that images can be acquired at significantly longer distances with the gated camera, compared to a conventional video camera, and examples of image processing of the range-gated images, which increases the image quality significantly.
Abstract: In this work we evaluate the imaging performance of a range-gated underwater system in natural waters. Trials have
been performed in both turbid and clear water. The field trials show that images can be acquired at significantly longer
distances with the gated camera, compared to a conventional video camera. The distance where a target can be detected
is increased by a factor of 2. For images suitable for object identification, the range improvement factor is typically 1.5.
We also show examples of image processing of the range-gated images, which increases the image quality significantly.
18 citations
••
13 Oct 2005TL;DR: In this paper, phase screens are used to model laser beam propagation over land and sea, and a generic example describing laser countermeasure against an infrared homing missile in a naval scenario is presented.
Abstract: Understanding and predicting laser beam propagation effects in the atmosphere is of importance for laser countermeasures and related applications. Turbulence effects cause beam wander, beam broadening and intensity scintillations reducing e.g. the power in bucket and the tracking accuracy. Modelling laser beam propagation in turbulence using successive phase screens provides an efficient tool for performance predictions. In this work phase screens are used to model laser beam propagation over land and sea. Different phase screens generators utilising the Kolmogorov or von Karman spectra were considered. Critical parameters using phase screens include the number of screen applied along the propagation path, inner- and outer scale size, variations in the structure parameter and spatial frequencies. Effects such as beam wander, angle-of-arrival fluctuations and intensity scintillations are discussed. The simulated results are compared with experimental data recorded at different ranges, various turbulence strengths and for single- and double paths. A generic example describing laser countermeasure against an infrared homing missile in a naval scenario is presented.
18 citations
••
TL;DR: In this article, the solar wind impacting on the magnetopause, i.e., the boundary between solar wind and the Earth's magnetosphere, can penetrate the magnetosphere.
Abstract: Plasma structures, here typified by the term 'plasmoids', in the solar wind impacting on the magnetopause, i. e. the boundary between the solar wind and the Earth's magnetosphere, can penetrate thi ...
18 citations
••
02 Jun 2008TL;DR: In this paper, a bistatic ultra-wideband VHF-band SAR experiment was conducted in Switzerland with the ground-based receiver located on Mount Niesen in Berner Oberland.
Abstract: We describe a bistatic ultra-wideband VHF-band SAR experiment and present measurement results. The bistatic SAR system, operating in the band 28-73 MHz, is based on CARABAS-II as airborne transmitter and LORA as ground-based receiver. Monostatic SAR data can also be acquired simultaneously. In September 2007, a measurement campaign was conducted in Switzerland with the ground-based receiver located on Mount Niesen in Berner Oberland. The objective was to investigate the hypothesis that the bistatic signal-to-clutter ratio for a vehicle in a background of forested terrain or urban environment increases as the bistatic elevation angle increases. Both mono- and bistatic SAR images have been formed using backprojection techniques. Images with bistatic elevation angle of 4deg (quasi-monostatic case) show similar characteristics as the monostatic images. The images with bistatic elevation angle of 10deg and 20deg, however, indicate that the clutter level decreases over both forested and urban areas. Measurements show that the signal-to-clutter ratio for a truck vehicle in a forest background increases by up to 10 dB compared with the quasi-monostatic case. The corresponding increase in signal-to-clutter ratio for an urban background is 2-8 dB, with the higher value obtained for multi-level buildings. These observations indicate that target detection can be significantly improved by using bistatic VHF-band SAR geometries.
18 citations
••
TL;DR: In this paper, a novel approach to computational almost inextensible transversely isotropic and nearly incompressible finite hyperelastic fiber mechanics is introduced which relies on using an equivalent generalised right Cauchy-Green stretch tensor which is volume preserving and simply-stretch free in the limit of incompressibility and inextensibility.
18 citations
Authors
Showing all 1417 results
Name | H-index | Papers | Citations |
---|---|---|---|
Anders Larsson | 80 | 1307 | 33995 |
Anders Johansson | 75 | 538 | 21709 |
Anders Eriksson | 68 | 679 | 19487 |
Dan S. Henningson | 66 | 369 | 19038 |
Bengt Johansson | 66 | 635 | 19206 |
Anders Sjöstedt | 63 | 196 | 11422 |
Björn Johansson | 62 | 637 | 16030 |
Mats Gustafsson | 61 | 520 | 18574 |
D. G. Joakim Larsson | 58 | 151 | 13687 |
Anders Larsson | 54 | 198 | 55761 |
Mats Tysklind | 53 | 250 | 17534 |
Jerker Fick | 51 | 143 | 8787 |
Erik Johansson | 50 | 114 | 9437 |
Göran Finnveden | 49 | 193 | 12663 |
Ian A. Nicholls | 45 | 194 | 7522 |