| 1. |
- Persson, Björn, et al.
(författare)
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Conservative RCS Models for Tactical Simulation
- 2015
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Ingår i: IEEE Antennas & Propagation Magazine. - : IEEE. - 1045-9243 .- 1558-4143. ; 57:1, s. 217-223
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes a procedure for generating conservative radar cross section (RCS) models able to meet the computational requirements imposed by simulation and related applications. The key concept is to downsample calculated or measured RCS data retaining local extreme values; thus, a conservative RCS matrix is obtained. Spline approximations are used in order to obtain continuity in the RCS models. RCS models with varying resolution have been generated and analyzed, and it is shown how spatial Fourier transforms can be used when determining feasibility for certain decision making applications. Furthermore, it is found that the interpolation errors obtained from the conservative RCS models are well described by generalized extreme value theory.
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| 2. |
- Persson, Björn, 1986-, et al.
(författare)
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Reduction of RCS Samples Using the Cubed Sphere Sampling Scheme
- 2016
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Ingår i: Progress In Electromagnetics Research M. - : Electromagnetics Academy. - 1937-8726. ; 48, s. 103-112
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 3. |
- Huskaj, Gazmend, et al.
(författare)
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Designing attack infrastructure for offensive cyberspace operations
- 2020
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Ingår i: Proceedings of the 19th European Conference on Cyber Warfare and Security. - Reading, UK : Academic Conferences and Publishing International Limited. - 9781912764617 - 9781912764624 ; , s. 473-482
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Konferensbidrag (refereegranskat)abstract
- This article addresses the question ‘what considerations should be taken by cyber commands when designing attack infrastructure for offensive operations?’. Nation-states are investing in equipping units tasked to conduct offensive cyberspace operations. Generating ‘deny, degrade, disrupt, destroy or deceive’ effects on adversary targets requires to move from own (‘green’), through neutral (‘grey’), to adversary (‘red’) cyberspace. The movement is supported by attack infrastructure for offensive cyberspace operations. In this paper, we review the professional and scientific literature identifying the requirements for designing an attack infrastructure. Next, we develop and define the concepts for attack infrastructure. Finally, we explain and describe the considerations for designing attack infrastructure. The research question is answered by proposing a framework for designing attack infrastructure. This framework is vital for military and civilian commands designing attack infrastructure for offensive cyberspace operations.
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| 4. |
- Trimintzios, Panagiotis, et al.
(författare)
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Report on Cyber Crisis Cooperation and Management : Comparative study on the cyber crisis management and the general crisis management
- 2015
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Rapport (populärvet., debatt m.m.)abstract
- The goal of this study is to provide an analysis of cyber crisis management by identifying relations between this emerging field and the better established subject of general crisis management. This includes terminology and key concepts in these fields. This study further seeks to gain knowledge and understanding of the involved actors’ perspectives on the challenges for Cyber Crisis management within the European context.The purpose of the study is twofold: to compare concepts from the general crisis management systems with the corresponding systems related to cyber crisis management, and to conduct a conceptual analysis of the language and terminology within these two fields. The primary aim is to analyse the similarities and differences between general and cyber crisis management, employing examples from countries and organizations within the EU.Based on interviews with members of key national and EU institutions, and on an analysis of the differences between their practitioner perspectives and the theories of general crisis management, the study arrives at six key areas of recommendations for future activities in the cyber security realm.
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| 5. |
- Lundberg, Jan, 1968-
(författare)
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Towards a conceptual framework for system of systems
- 2023
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Ingår i: Proceedings of the Doctoral Consortium Papers Presented at the 35th International Conference on Advanced Information Systems Engineering (CAiSE 2023), s. 18-24. ; , s. 18-24
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Konferensbidrag (refereegranskat)abstract
- In the shadow of the Ukrainian war, many western countries will increase their armed forces capabilities and this in an environment where new technology will have strong influence. The increased capabilities will be implemented in a context of automation, machine learning and other types of artificial intelligence (AI). At the same time, the new or enhanced capabilities must harmonize with multi-domain operations, where the need for speed, flexibility and interoperability are essential. Additionally, future defense forces will be forced to manage newand old systems and methods and integrate these so that the desired functionality and capabilityis achieved. At the same time, as new technical systems are introduced, methods and processes will develop. Consequently, new technology will bring possibilities of solving military problems in new ways.
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| 6. |
- Persson, Anders, et al.
(författare)
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Optogalvanic spectroscopy with microplasma sources – Current status and development towards lab on a chip
- 2016
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Ingår i: Journal of Micromechanics and Microengineering. - : IOP Publishing. - 0960-1317 .- 1361-6439. ; 26:10
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Tidskriftsartikel (refereegranskat)abstract
- Miniaturized optogalvanic spectroscopy (OGS) shows excellent prospects of becoming ahighly sensitive method for gas analysis in micro total analysis systems. Here, a status reporton the current development of microwave induced microplasma sources for OGS is presented,together with the first comparison of the sensitivity of the method to conventional single-passabsorption spectroscopy. The studied microplasma sources are stripline split-ring resonators(SSRRs), with typical ring radii between 3.5 and 6 mm and operation frequencies around2.6 GHz. A linear response (R2 = 0.9999), and a stability of more than 100 s are demonstratedwhen using the microplasma source as an optogalvanic detector. Additionally, saturationeffects at laser powers higher than 100 mW are observed, and the temporal response of theplasma to periodic laser perturbation with repletion rates between 20 Hz and 200 Hz arestudied. Finally, the potential of integrating additional functionality with the detector isdiscussed, with the particular focus on a pressure sensor and a miniaturized combustor toallow for studies of solid samples.
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| 7. |
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| 8. |
- Persson, Björn, et al.
(författare)
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On Modeling RCS of Aircraft for Flight Simulation
- 2014
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Ingår i: IEEE Antennas & Propagation Magazine. - IEEE : IEEE Antennas and Propagation Society. - 1045-9243 .- 1558-4143. ; 56:4, s. 34-43
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 9. |
- Silfverskiöld, Stefan, 1964-, et al.
(författare)
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Induced Voltages in a Low-Voltage Power Installation Network Due to Lightning Electronmagnetic Fields : An Experimental Study
- 1999
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Ingår i: IEEE transactions on electromagnetic compatibility (Print). - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9375 .- 1558-187X. ; 41:3, s. 265-271
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 10. |
- Silfverskiöld, Stefan, 1964-, et al.
(författare)
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Microwave Field-to-Wire Coupling Measurements
- 1998
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Konferensbidrag (refereegranskat)abstract
- 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.
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