Browsing by Title
Now showing items 351-370 of 2869
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Communication signal generation and automatic classification with detection of unknown formats using neural networks
(2004)The performance of algorithms for signal classification is often characterized according to their ability to correctly classify various signals belonging to a set of known signal formats. However, in a non-co-operative ... -
Communities of Trust in Tactical Coalition Networks
(2014)The need for information exchange between security domains has traditionally been approached through the use of guards and security labels. Although these technologies are thoroughly researched and exist in mature ... -
Compact airborne C-band radar sounder
(2014)We describe a lightweight wideband C-band radar sounder, which is designed for use in a small unmanned aerial vehicle, primarily for measuring snow and ice. The waveform used is a gated frequency modulated continuous wave, ... -
Compact camera for multispectral and conventional imaging based on patterned filters
(2014)A multispectral camera concept is presented. The concept is based on using a patterned filter in the focal plane, combined with scanning of the field of view. The filter layout has stripes of different bandpass filters ... -
Compact multimodal multispectral sensor system for tactical reconnaissance
(Society of Photo-Optical Instrumentation Engineers (SPIE), 2022-09-30)Multispectral imaging is an attractive sensing modality for small unmanned aerial vehicles (UAVs) in numerous military and civilian applications such as reconnaissance, target detection, and precision agriculture. Cameras ... -
Compact multispectral multi-camera imaging system for small UAVs
(2016)Cameras with filters in the focal plane provide the most compact solution for multispectral imaging. A small UAV can carry multiple such cameras, providing large area coverage rate at high spatial resolution. We investigate ... -
COMPACT project - hydro burst testing of impact damaged four-inch pressure vessels
(2013-09-20)Twelve four-inch pressure vessels made of carbon fibre reinforced plastic (CFRP) have been produced at FFI. The applied material system is a carbon fibre reinforced prepreg system, TCR UF3325-95/M30SC. The vessels have ... -
Comparative testing and evaluation of nine different air samplers: End-to-end sampling efficiencies as specific performance measurements for bioaerosol applications
(2014)Accurate exposure assessments are needed to evaluate health hazards caused by airborne microorganisms and require air samplers that efficiently capture representative samples. This highlights the need for samplers with ... -
Comparative visualization of multiple time surfaces by planar surface reformation
(2016)Comparing time surfaces at different integration time points, or from different seeding areas, can provide valuable insight into transport phenomena of fluid flows. Such a comparative study is challenging due to the often ... -
Comparing RLS and LMS adaptive equalizers for large hydrophone arrays in underwater acoustic communication channels
(2019-10-14)There is an expected growth in underwater acoustic data traffic. To meet the demand of high data throughput, a migration towards the very high frequency band (>100 kHz) will be necessary. The increment in frequency comes ... -
Comparing VO2max Improvement in Five Training Methods
(2012)This paper presents a theoretical study comparing the improvement of the whole body maximum oxygen uptake (maximum aerobic power or VO2max) when training at different intensities and with different methods matched for ... -
Comparison between analytical shock mechanic solutions and numerical solutions from the autodyn hydro code
(2004)Numerival codes, i.e. Autodyn are widely used for simulations purpose during impact and penetration of prosjectiles into targets. To check the validity of the simulations during shock compression we first study the axiomatic ... -
Comparison of 294 nm and 355 nm excitation wavelengths in UVLIF standoff detection of biological aerosols released in a semi-closed chamber
(2012-02-07)FFI has previously developed a lidar for standoff detection of biological aerosols based on ultraviolet laser induced fluorescence, using an excitation wavelength at 355 nm. A 294 nm laser source has been developed and ... -
A comparison of AUTODYN and RSPH on two-dimensional shock waves problems
(2009)It is important, both to the military and civilian community, to be able to predict the strength and propagation pattern of shock waves generated from the detonation of high explosives. This report documents a comparative ... -
A comparison of measurements and predictions of HF groundwave propagation
(2005)The field-strength of HF groundwave was logged for 6 different locations in the south-eastern part of Norway. Results were compared to models that take terrain elevation and ground conductivity/permittivity as input ... -
Comparison of Measurements with Prediction Methods for Propagation by diffraction at88 - 108 MHz
(2004)Three methods for predicting attenuation due to diffraction are tested against a large database of 115 614 measurement points, representing 115 614 different path profiles of 100-m horizontal resolution, and vertical root ... -
Comparison of RADARSAT and IKONOS satellite images - detection and visibility of man-made objects
(2001)This report compares the visual appearance and detection of different man-made objects in an area close to Bergen city in Norway using IKONOS (1 m resolution) and RADARSAT (9 m resolution) images respectively. The results ... -
A comparison of rain attenuation and drop size distributionsmeasured in Chilbolton and Singapore
(2002)Attenuation of radio waves caused by precipitation, especially in the form of rain, is considered to be the limiting factor for new communication systems that will exploit the radio wave spectrum at frequencies higher than ... -
Comparison of results from some chemical dispersion models and hazard prediction and assessment tools
(2010)Dispersion models and hazard prediction and assessment software tools are used to assess consequences from dispersion of hazardous materials, such as toxic chemicals. Such tools can be employed during and after an event ... -
Comparison of simulated and measured ISAR images flow of a ship at sea
(2021-07-02)The aim of this work is to simulate a flow of ISAR images for a ship at sea seen from an airborne radar, in rigorously the same configuration as it has been measured by a real SAR using the recorded motion data of both ...