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BETA
Norsell, Martin, Professor
Publications (10 of 24) Show all publications
Persson, B. & Norsell, M. (2016). Reduction of RCS Samples Using the Cubed Sphere Sampling Scheme. Progress In Electromagnetics Research M, 48, 103-112
Open this publication in new window or tab >>Reduction of RCS Samples Using the Cubed Sphere Sampling Scheme
2016 (English)In: Progress In Electromagnetics Research M, ISSN 1937-8726, Vol. 48, p. 103-112Article in journal (Refereed) Published
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. 

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering; Militärteknik
Identifiers
urn:nbn:se:fhs:diva-6099 (URN)10.2528/PIERM16022503 (DOI)000410503300011000410503300011 ()
Funder
VINNOVA, 2010-01259
Available from: 2016-04-13 Created: 2016-04-20 Last updated: 2018-06-29Bibliographically approved
Persson, B. & Norsell, M. (2015). Conservative RCS Models for Tactical Simulation. IEEE Antennas & Propagation Magazine, 57(1), 217-223
Open this publication in new window or tab >>Conservative RCS Models for Tactical Simulation
2015 (English)In: IEEE Antennas & Propagation Magazine, ISSN 1045-9243, E-ISSN 1558-4143, Vol. 57, no 1, p. 217-223Article in journal (Refereed) Published
Abstract [en]

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.

Keywords
Electromagnetic modeling, Fourier transforms, military equipment, modeling and simulation, physical optics, radar cross section (RCS), statistical distributions
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Militärteknik
Identifiers
urn:nbn:se:fhs:diva-5595 (URN)10.1109/MAP.2015.2397151 (DOI)000352237400020 ()
Available from: 2015-10-30 Created: 2015-10-30 Last updated: 2018-06-29Bibliographically approved
Persson, B. & Norsell, M. (2014). On Modeling RCS of Aircraft for Flight Simulation. IEEE Antennas & Propagation Magazine, 56(4), 34-43
Open this publication in new window or tab >>On Modeling RCS of Aircraft for Flight Simulation
2014 (English)In: IEEE Antennas & Propagation Magazine, ISSN 1045-9243, E-ISSN 1558-4143, Vol. 56, no 4, p. 34-43Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
IEEE Antennas and Propagation Society, 2014
Keywords
Electromagnetic modeling, aerospace simulation, computer simulation, interpolation modeling and simulation, radar cross sections, radar detection
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Militärteknik
Identifiers
urn:nbn:se:fhs:diva-5005 (URN)10.1109/MAP.2014.6931656 (DOI)000345816100002 ()
Projects
Värdering av flygplans överlevnad, NFFP5
Funder
VINNOVA, 2010-01259
Available from: 2014-11-11 Created: 2014-11-11 Last updated: 2018-06-28Bibliographically approved
Axberg, S., Andersson, K., Bang, M., Bruzelius, N., Bull, P., Eliasson, P., . . . Vretblad, B. (2013). Lärobok i Militärteknik, vol. 9: Teori och metod (1ed.). Stockholm: Försvarshögskolan (FHS)
Open this publication in new window or tab >>Lärobok i Militärteknik, vol. 9: Teori och metod
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2013 (Swedish)Book (Other academic)
Abstract [sv]

Ämnet militärteknik utgår från att tekniska system är officerens arbetsredskap och att en förståelse för och kunskap om dessa verktyg är central för att kunna utöva professionen framgångsrikt. Denna nionde volym av Lärobok i Militärteknik, benämnd Teori och Metod, behandlar centrala begrepp, teorier och postulat samt metoder för värdering av teknik och består av ett antal texter författade av 16 forskare och lärare vid den militärtekniska avdelningen. Volymen riktar sig främst till de som inlett sin officersutbildning och utgörs till stora delar av ett kompilat av publicerade och opublicerade militärtekniska texter och kan sägas utgöra militärteknikens ”state of the art”.

Place, publisher, year, edition, pages
Stockholm: Försvarshögskolan (FHS), 2013. p. 146 Edition: 1
Series
Lärobok i militärteknik, ISSN 1654-4838 ; 9
Keywords
militärteknik, militär nytta, risk, system, militär förmåga, teknikens inverkan
National Category
Other Engineering and Technologies not elsewhere specified Other Social Sciences not elsewhere specified
Research subject
Militärteknik
Identifiers
urn:nbn:se:fhs:diva-4381 (URN)9789186137236 (ISBN)
Available from: 2014-01-10 Created: 2014-01-10 Last updated: 2017-08-07Bibliographically approved
Liwång, H., Ringsberg, J. W. & Norsell, M. (2013). Quantitative risk analysis: Ship security analysis for effective risk control options. Safety Science, 58, 98-112
Open this publication in new window or tab >>Quantitative risk analysis: Ship security analysis for effective risk control options
2013 (English)In: Safety Science, ISSN 0925-7535, E-ISSN 1879-1042, Vol. 58, p. 98-112Article in journal (Refereed) Published
Abstract [en]

This study reviews ship security assessment. The objectives are to explore the possibilities for quantifying and performing a more thorough ship security risk analysis than that described in the International Ship and Port Facility Security code and to evaluate to what extent this more detailed analysis increases ship security and facilitate the effective selection of risk control options.

The study focuses on Somali-based maritime piracy, using piracy on the Indian Ocean as a case study. Data are collected using questionnaires and interviews with civilian and military security experts who possess firsthand experience of piracy off the coast of Somalia. The data are collected specifically for this study and describe and quantify the threat’s capability, intent and likelihood of exploiting a ship’s vulnerability. Based on the collected description of the threat, the study analyzes and describes: probability of detection by pirates, probability of successful approach, and probability of successful boarding.

The performed work shows good agreement between calculated probabilities and frequencies in the cited incident reports. Also, the developed scenarios describe the most important influences on the analyzed areas. The research therefore shows that the proposed risk-based approach, which uses structurally collected and documented information on the threat, can increase ship security by assisting in selecting risk control options. The approach also allows for a better understanding of the causal relationship between threat and risk than that provided in today’s security analysis by ship owners, for example. This understanding is crucial to choosing effective and robust risk control options.

Keywords
control option, influence diagram, piracy, quantified risk management, ship security analysis
National Category
Other Engineering and Technologies not elsewhere specified Vehicle Engineering Social Sciences Interdisciplinary
Research subject
Militärteknik
Identifiers
urn:nbn:se:fhs:diva-3800 (URN)10.1016/j.ssci.2013.04.003 (DOI)000320298000012 ()
Available from: 2013-05-22 Created: 2013-05-22 Last updated: 2018-06-28Bibliographically approved
Liwång, H., Ringsberg, J. W. & Norsell, M. (2012). Probabilistic Risk Assessment for Integrating Survivability and Safety Measures on Naval Ships. International Journal of Maritime Engineering (154), A21-A30
Open this publication in new window or tab >>Probabilistic Risk Assessment for Integrating Survivability and Safety Measures on Naval Ships
2012 (English)In: International Journal of Maritime Engineering, ISSN 1479-8751, E-ISSN 1740-0716, no 154, p. A21-A30Article in journal (Refereed) Published
Abstract [en]

Conflicts of today are characterized by both traditional and irregular tactics and by non-state actors making innovative use of modern technologies. These conditions set new demands on naval ships. The aim of this investigation is to describe how, based on probabilistic risk assessment, the concept of operation for a naval ship can be turned into safety scenarios to be used in the evaluation of risk. In this investigation, civilian state-of-the-art methods for probabilistic risk assessment are merged with the specific demands of naval ships. Relevant aspects of safety culture, codes, regulations and rules are analysed with respect to requirements on safety scenarios, and military operational research with respect to modelling military systems. The results show that the scenarios must have calculable probability and must be adapted to the vessel in question. Results from simulations show that modelling operational tasks is one way to support experts in the definition of safety scenarios.

Place, publisher, year, edition, pages
London: , 2012
Keywords
risk analysis, military-technology, naval ships, safety, security, scenario
National Category
Other Engineering and Technologies not elsewhere specified
Research subject
Militärteknik
Identifiers
urn:nbn:se:fhs:diva-2609 (URN)
Available from: 2012-05-25 Created: 2012-05-25 Last updated: 2017-08-31Bibliographically approved
Bull, P., Eliasson, P. & Norsell, M. (2011). An Experimental Approach to Improve on the Situational Awareness of Soldiers Transported in an Armored Vehicle (1ed.). In: Åke Sivertun (Ed.), Stockholm Contributions in Military-Technology 2010 (pp. 95-106). Stockholm: Försvarshögskolan
Open this publication in new window or tab >>An Experimental Approach to Improve on the Situational Awareness of Soldiers Transported in an Armored Vehicle
2011 (English)In: Stockholm Contributions in Military-Technology 2010 / [ed] Åke Sivertun, Stockholm: Försvarshögskolan , 2011, 1, p. 95-106Chapter in book (Refereed)
Abstract [en]

Inside armored vehicles, such as e.g. Hägglunds CV90 or Mowag Piranha, the possibilities for looking out are rather limited. That is especially true for the soldiers being transported inside the personnel compartment. Because of this, the soldiers are in effect expected to put themselves into harms way with very limited knowledge of what is happening outside the vehicle. One possible way to improve the situational awareness inside an armored vehicle is to have screens showing live images of the outside environment. The current investigation utilizes a set of carefully placed cameras connected to screens streaming live images inside the vehicle. It is found that this will significantly improve the situational awareness of the soldiers inside the armored vehicle. Field trials conducted in a realistic environment show that a careful placement of the cameras and the screens will increase the safety, and the efficiency, of the soldiers when they dismount the vehicle. 

Place, publisher, year, edition, pages
Stockholm: Försvarshögskolan, 2011 Edition: 1
Series
Stockholm Contributions in Military-Technology, ISSN 1654-9775 ; 2
Keywords
Military-technology, International Society of Military Sciences Conference, Situational Awareness (SA), Armored vehicle, Militärteknik, International Society of Military Sciences Conference, lägesuppfattning, situationsuppfattning, bepansrat fordon
National Category
Other Engineering and Technologies not elsewhere specified
Research subject
Militärteknik
Identifiers
urn:nbn:se:fhs:diva-2106 (URN)978-91-86137-076-6 (ISBN)
Available from: 2011-10-31 Created: 2011-10-31 Last updated: 2011-12-15Bibliographically approved
Silfverskiöld, S., Norsell, M., Bull, P. & Fransson, T. (2011). Interactive Teaching of Military-Technology: A Pilot Study of Implementation (1ed.). In: Åke Sivertun (Ed.), Stockholm Contributions in Military-Technology 2010 (pp. 141-150). Stockholm: Försvarshögskolan
Open this publication in new window or tab >>Interactive Teaching of Military-Technology: A Pilot Study of Implementation
2011 (English)In: Stockholm Contributions in Military-Technology 2010 / [ed] Åke Sivertun, Stockholm: Försvarshögskolan , 2011, 1, p. 141-150Chapter in book (Refereed)
Abstract [en]

The interactive learning platform Comp Edu, developed and used since 1997 at the Division of Heat and Power Technology at the Royal Institute of Technology, has recently been introduced as a new tool for teaching Military-Technology at the Swedish National Defence College. In this pilot study, interactive teaching has been tested at the initial training of junior officers at the Swedish National Defence College. Results from a student evaluation of the tool are presented. These results will be incorporated in future implementations of this interactive teaching method on a broader scale in Military-Technology. The students appreciated the freedom of being able to choose when and where to study the pensum and found CompEdu being an excellent tool for facilitating reviewing the chapter before an exam. An outline for future work is presented.

Place, publisher, year, edition, pages
Stockholm: Försvarshögskolan, 2011 Edition: 1
Series
Stockholm Contributions in Military-Technology, ISSN 1654-9775 ; 2
Keywords
Military-technology, International Society of Military Sciences Conference, Interactive teaching, CompEdu, Militärteknik, International Society of Military Sciences Conference, elärande, distansundervisning, CompEdu
National Category
Other Engineering and Technologies not elsewhere specified
Research subject
Militärteknik
Identifiers
urn:nbn:se:fhs:diva-2107 (URN)978-91-86137-07-6 (ISBN)
Available from: 2011-10-31 Created: 2011-10-31 Last updated: 2011-12-15Bibliographically approved
Liwång, H., Westin, J., Wikingsson, J. & Norsell, M. (2011). Minimising Risk from Armed Attacks: The Effects of the Nato Naval Ship Code (1ed.). In: Åke Sivertun (Ed.), Stockholm Contributions in Military-Technology 2010: (pp. 65-81). Stockholm: Försvarshögskolan
Open this publication in new window or tab >>Minimising Risk from Armed Attacks: The Effects of the Nato Naval Ship Code
2011 (English)In: Stockholm Contributions in Military-Technology 2010 / [ed] Åke Sivertun, Stockholm: Försvarshögskolan , 2011, 1, p. 65-81Chapter in book (Refereed)
Abstract [en]

The NATO Standardization Agency (NSA) is proposing a Naval Ship Code (NSC) that can be applied to surface naval vessels and other vessels operated by the armed forces or agencies of a state. The NSC is optional and based on, and benchmarked against, conventions and resolutions of the International Maritime Organisation.

The NSC cover areas such as ship controllability, engineering systems, fire safety, evacuation, communications and navigation. The code does not include measures specifically designed to address the effects of armed attack.

The covered areas in NSC are however also very important when the effects from armed attack is to be minimised. This work investigates how the NSC will effect, and interact with, measures to ensure survivability under attack. Survivability is here seen as a function of the ships susceptibility, vulnerabilityand recoverability. Based on two case studies this paper exemplifies the effect of the NSC on the vessels total safety. The case studies presented are ballistic protection on smaller naval vessels and bridge configuration to minimize effects of attacks.

Place, publisher, year, edition, pages
Stockholm: Försvarshögskolan, 2011 Edition: 1
Series
Stockholm Contributions in Military-Technology, ISSN 1654-9775 ; 2
Keywords
Military-technology, International Society of Military Sciences Conference, Nato, Naval Ship Code, Militärteknik, International Society of Military Sciences Conference, Nato, sjörätt
National Category
Other Engineering and Technologies not elsewhere specified
Research subject
Militärteknik
Identifiers
urn:nbn:se:fhs:diva-2105 (URN)978-91-86137-07-6 (ISBN)
Available from: 2011-10-31 Created: 2011-10-31 Last updated: 2015-02-11Bibliographically approved
Norsell, M., Jäppinen, I., Eliasson, P. & Silfverskiöld, S. (2011). The Mutual Coupling Between War Fighting Capabilities and Military-Technology (1ed.). In: Åke Sivertun (Ed.), Stockholm Contributions in Military-Technology 2010 (pp. 21-28). Stockholm: Försvarshögskolan
Open this publication in new window or tab >>The Mutual Coupling Between War Fighting Capabilities and Military-Technology
2011 (English)In: Stockholm Contributions in Military-Technology 2010 / [ed] Åke Sivertun, Stockholm: Försvarshögskolan , 2011, 1, p. 21-28Chapter in book (Refereed)
Abstract [en]

In modern warfare the dependence on and interaction with technology is internationally undisputed. Starting from the currently used definition of the academic subject of Military-Technology in Sweden and Finland this interaction is analyzed with reference to Swedish and Finnish doctrine. An elaborate discussion is given about how progression in the subject of Military-Technology is achieved compared to other military sciences. This paper aims to highlight that the current focus on command levels might not necessarily be suitable for strengthening the war fighting capabilities. Finally, the Military-Technology connection and contribution to the war fighting capabilities will be discussed and emphasized. The shortcomings and pitfalls of the currently used methods will also be discussed. Furthermore, the necessity of having a Military-Technology perspective to increase quality and relevance in officers’ education is stressed because it is shown that the war fighting capabilities and Military-Technology interaction is strong based on the Swedish and Finnish doctrine.

Place, publisher, year, edition, pages
Stockholm: Försvarshögskolan, 2011 Edition: 1
Series
Stockholm Contributions in Military-Technology, ISSN 1654-9775 ; 2
Keywords
Military-technology, International Society of Military Sciences Conference, Sweden, Finland, Militärteknik, International Society of Military Sciences Conference, Sverige, Finland
National Category
Other Engineering and Technologies not elsewhere specified
Research subject
Militärteknik
Identifiers
urn:nbn:se:fhs:diva-2101 (URN)978-91-86137-07-6 (ISBN)
Available from: 2011-10-28 Created: 2011-10-28 Last updated: 2011-12-15Bibliographically approved
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