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  • 1.
    Lien, Kristian
    Försvarshögskolan.
    ”LIDAR, en sensorrevolusjon for Hæren?”2014Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [no]

    LIDAR er en sensor type som pr idag ikke er satt i drift ved hærens kampavdelinger. Teknologiens anvendelsesområde er bredt, og for denne oppgaven begrenset til å belyse sensorrollen i ett bakke til bakke scenario ved kampavdelinger der sensortypen nyttes for å bygge opp en sjefs situasjonsforståelse (SA).

    Det er i denne oppgaven ført sammen resultater fra samfunnsvitenskapelig metoder og naturvitenskapelige metoder ved å måle militær nytte for en sensor mot den situasjonsforståelse den bidrar med for en sjef, og hvordan dette gjør han i stand til å nytte de taktiske prinsipper. Datainnsamlingen er gjort ved litteraturstudier av naturvitenskapelig faglitteratur og publiserte artikler, og studiebesøk ved Svenska Totalforsvarets Forskningsinstitutt (FOI). For å beskrive en sensors betydning og rolle er datainnsamlinger gjort ved intervjuer av fagoffiserer med bred bakgrunn i bruk av sensorer og ledelse av taktiske kampenheter.

    Resultatene synliggjør en sensors viktige rolle som direkte bidragsyter til en sjefs situasjonsforståelse. Resultatene viser hvilken påvirkning en sensor kan ha for å gi mulighet for en sjef til å utøve de taktiske grunnprinsipper. Resultatene indikerer tydelig hvor en LIDAR vil kunne forsterke i denne rollen. Dette vil den gjøre ved sin gode mulighet til deteksjon, klassifisering og identifisering på lange avstander, og dens evne til å penetrere kunstige og naturlig kamuflasje og skjerming, og således bidra ytterligere til forhøyet situasjonsforståelse (SA) enn det som kan oppnås med dagens sensorer. Konklusjonen er at en LIDAR sensor kan nyttes ved hærens kampavdelinger som målsensor, og at en innføring vil kunne gi en sjef miltær nytte i form av økt SA og bedret beslutningsgrunnlag. Det er og klart at den ikke kan erstatte dagens systemer, men gå inn som ett komplimenterende system som kan nyttes under gitte forutsetninger.

  • 2.
    Persson, Björn
    et al.
    Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Militärtekniska avdelningen (MTA).
    Norsell, Martin
    Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Militärtekniska avdelningen (MTA).
    Conservative RCS models for simulationArtikkel i tidsskrift (Annet vitenskapelig)
  • 3.
    Persson, Björn
    et al.
    Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Militärtekniska avdelningen (MTA). KTH.
    Norsell, Martin
    Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Militärtekniska avdelningen (MTA).
    On Modeling RCS of Aircraft for Flight Simulation2014Inngår i: IEEE Antennas & Propagation Magazine, ISSN 1045-9243, E-ISSN 1558-4143, Vol. 56, nr 4, s. 34-43Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper investigates the implementation of the radar cross section (RCS) of aircraft in modeling and simulation (M&S). More specifically, it addresses the tradeoff between accuracy and computational cost introduced by spatial RCS fluctuations. High-resolution RCS matrices, generated using Physical Optics (PO), were used in an investigation of RCS matrix resolution, and an evaluation of different bilinear interpolation methods is presented. The spatial Fourier transform was used for resolution analysis. It was found that the smallest RCS interpolation error was obtained using splines. Furthermore, results showed that the distribution of the relative interpolation error in detection range was well approximated by a log-normal distribution.

  • 4.
    Persson, Björn
    et al.
    Department of Vehicle Engineering, Royal Institute of Technology, Stockholm, Sweden..
    Norsell, Martin
    Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Militärtekniska avdelningen (MTA).
    Reduction of RCS Samples Using the Cubed Sphere Sampling Scheme2016Inngår i: Progress In Electromagnetics Research M, ISSN 1937-8726, Vol. 48, s. 103-112Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An alternative to the traditional method of sampling radar cross section data from measurements or electromagnetic code is presented and evaluated. The Cubed Sphere sampling scheme solves the problem of oversampling at high and low elevation angles and at equal equatorial resolution the scheme can reduce the number of samples required by approximately 25%. The analysis is made of an aircraft model with a monostatic radar cross section at C-band and a bistatic radar cross section at VHF-band, using Physical Optics and the Multilevel Fast Multipole Method, respectively. It was found that for the monostatic radar cross section, the Cubed Sphere sampling scheme required approximately 12% fewer samples compared to that required for traditional sampling while maintaining the same interpolation accuracy ever the entire domain. For the bistatic data, it was possible to reduce the number of samples by approximately 45% for high sampling resolutions. Using spline interpolation the number of samples required could be reduced even further. 

  • 5.
    Silfverskiöld, Stefan
    et al.
    Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Militärtekniska avdelningen (MTA).
    Backstrom, M.
    Loren, J.
    Microwave field-to-wire coupling measurements in anechoic and reverberation chambers2002Inngår i: IEEE transactions on electromagnetic compatibility (Print), ISSN 0018-9375, E-ISSN 1558-187X, Vol. 44, nr 1, s. 222-232Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Knowledge of the differences in radiated susceptibility (RS) testing in anechoic (AC) and reverberation chambers (RC) is essential for analysis of the susceptibility of electronic systems to microwave radiation. We have studied microwave field-to-wire coupling for some basic wire geometries above a ground plane in ACs and RC. Results for receiving parameters such as the antenna receiving cross section sigma(w) and the effective antenna length of the wire, h(e), are presented. The ratio between the maximum and average values of sigma(w) may exceed 15 dB in the AC, the average being equal to sigma(w) measured in the RC. Large variations in sigma(w) show that the outcome of an RS test in an AC may depend strongly on the direction and polarization of the incident field. For a realistic RS test in ACs only a few angles of incidence can typically be afforded, implying a substantial risk for undertesting. Furthermore, a. measured in the RC follows a chi(2)-distribution with two degrees of freedom. The measurements in the AC do not follow the same distribution.

  • 6.
    Silfverskiöld, Stefan
    et al.
    Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Militärtekniska avdelningen (MTA).
    Bäckström, Mats
    Totalförsvarets Forskningsinstitut, FOI.
    Lorén, Jörgen
    Totalförsvarets Forskningsinstitut, FOI.
    Microwave Field-to-Wire Coupling Measurements1998Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Knowledge of antenna receiving properties of wires and cables is essential in the analysis of susceptibility of electronic systems to microwave radiation. This paper presents measurements of receiving parameters for basic wire geometries. Directional properties of realized gain, receiving cross section and of effective antenna lenght for the wires are presented. The impact of measured directivity effects of the order of 15 dB on radiated susceptibility testing in anechoic and mode-stirred chambers is discussed.

  • 7.
    Silfverskiöld, Stefan
    et al.
    Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Militärtekniska avdelningen (MTA).
    Bäckström, Mats
    Totalförsvarets forskningsinstitut, FOI.
    Lorén, Jörgen
    Totalförsvarets forskningsinstitut, FOI.
    Microwave Field-to-Wire Coupling Measurements in Anechoic and Reverberation Chambers2002Inngår i: IEEE transactions on electromagnetic compatibility (Print), ISSN 0018-9375, E-ISSN 1558-187X, Vol. 44, nr 1, s. 222-232Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Knowledge of the differences in radiated susceptibility (RS) testing in anechoic (AC) and reverberation chambers (RC) is essential for analysis of the susceptibility of electronic systems to microwave radiation. We have studied microwave field-to-wire coupling for some basic wire geometries above a ground plane in ACs and RC. Results for receiving parameters such as the antenna receiving cross section and the effective antenna length of the wire, he, are presented. The ratio between the maximum and average values of the antenna receiving cross section may exceed 15 dB in the AC, the average being equal to the antenna receiving cross section measured in the RC. Large variations in the antenna receiving cross section show that the outcome of an RS test in an AC may depend strongly on the direction and polarization of the incident field. For a realistic RS test in ACs only a few angles of incidence can typically be afforded, implying a substantial risk for undertesting. Furthermore, the antenna receiving cross section measured in the RC follows a Chi-square-distribution with two degrees of freedom. The measurements in the AC do not follow the same distribution.

  • 8.
    Silfverskiöld, Stefan
    et al.
    Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Militärtekniska avdelningen (MTA).
    Thottappillil, Rajeev
    Uppsala Universitet, Institutionen för Högspänningsforskning.
    Ye, Ming
    Uppsala Universitet, Institutionen för Högspänningsforskning.
    Cooray, Vernon
    Uppsala Universitet, Institutionen för Högspänningsforskning.
    Scuka, Viktor
    Uppsala Universitet, Institutionen för Högspänningsforskning.
    Induced Voltages in a Low-Voltage Power Installation Network Due to Lightning Electronmagnetic Fields: An Experimental Study1999Inngår i: IEEE transactions on electromagnetic compatibility (Print), ISSN 0018-9375, E-ISSN 1558-187X, Vol. 41, nr 3, s. 265-271Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents the experimental results on the induced common-mode (CM) voltages in a residential low-voltage power installation (LVPI) network exposed to electromagnetic fields from lightning. The objective of this investigation was to find out the severity of inducedvoltages in a low voltage network due to direct coupling of the lightning electromagnetic fields with the network in the absence of transient overvoltages coming through the distribution lines. Therefore, during the experiment the LVPI network was disconnected from the distribution network to exclude conducted transients in the measured signals entering through the mains. The induced CM voltages in a power outlet of the network were measured simultaneously with the vertical component of the electric field near the installation. The sequence of induced voltage events during the complete duration of one negative cloud-to-ground (CG) flash, one positive CG flash, and one cloud flash (CC), thought to be typical, is presented simultaneously with the electric field. It is shown that in addition to the return strokes in ground flashes, other discharge events taking place in the cloud; notably, the bipolar pulse trains associated with the initiation of both CG lightning and cloud lightning, are also important in determining the transient environment of electronic devices connected to a LVPI network. Flashes at a distance of about 25 km produced many induced-voltage pulses as large as 100 V, six such pulses in a time period of 0.4 ms in a negative CG flash, and 11 such pulses in a time period of 3 ms in a CC that immediately followed the ground flash.

  • 9.
    Sivertun, Åke
    Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Militärtekniska avdelningen (MTA). MTA Försvarhögskolan.
    Critique systems for Geographic information and GIS2009Inngår i: Proceedings at 24th International Cartographic Conference ICC 2009 Santiago, Chile, Santiago, Chile, 2009Konferansepaper (Fagfellevurdert)
  • 10.
    Sivertun, Åke
    2Department of Computer and Information Science (IDA), Linköping University, Sweden.
    Integration of remote sensed images and semantic based Descriptors for Hazards and risks management2008Konferansepaper (Fagfellevurdert)
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