Swedish Defence Research Agency

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.

Understanding the Crisis Management System of the European Union

Abstract: In less than a decade, Europe has witnessed a series of large-scale natural disasters and two large terrorist attacks. Traditionally, incidents of this kind have been the sole responsibility of the individual Member States. However, a growing concern among the members of the European Union about the trans-national effects of these incidents has caused them to ask for more cooperative arrangements within the field of disaster and crisis management.

Flight control system validation using global nonlinear optimisation algorithms

Abstract: In this paper the results from a validation of the functionality of Maneuver Load Limiter in the longitudinal control system for the generic aircraft simulation model ADMIRE, using global optimisation algorithms are presented. The analysis is based upon the reformulation of the nonlinear time domain simulation-based stability criterion Clonk, into a global optimisation problem. Results from both a traditional grid-based search for the worst uncertainty parameter combination and optimisation-based search with algorithms based upon a Genetic Algorithm and Adaptive Simulated Annealing are presented.

A Fratricidal Libya: Making Sense of a Conflict Complex

Abstract: This study explores the development of Libya’s security situation following the so-called Arab Spring in 2011 up to March 2016. It provides an overview of Libya’s main warring parties and the struggles they are engaged in. The analysis covers both domestic groups and the main external stakeholders. The study finds that the security dynamics are changing quickly and that Libya has many political hurdles and security challenges to overcome before a more durable situation of stability can be achieved.

On the Use of MEMS Phase Shifters in a Low-Cost Ka-band Multifunctional ESA on a Small UAV

Abstract: We present a system concept for a Ka-band multi-functional electronically steerable antenna (ESA) on a small UAV that is based on using sub-arrays with low-loss RF MEMS phase shifters. Our analysis shows that low phase shifter losses are critical if the dissipated radar hardware DC power should fit within the given requirements. The results presented in this paper also indicate that adequate performance (in terms of 2 dB of average losses at 35 GHz) can be possible to achieve with a Ka- band 4-bits MEMS phase shifter design made on quartz.

Oxygen or carbogen breathing before simulated submarine escape

Abstract: Raised internal pressure in a distressed submarine increases the risk of bubble formation and decompression illness after submarine escape. The hypothesis that short periods of oxygen breathing before submarine escape would reduce decompression stress was tested, using Doppler-detectable venous gas emboli as a measure. Twelve goats breathed oxygen for 15 min at 0.1 MPa before exposure to a simulated submarine escape profile to and from 2.5 MPa (240 m/seawater), whereas 28 control animals underwent the same dive without oxygen prebreathe. No decompression sickness (DCS) occurred in either of these two groups. Time with high bubble scores (Kisman-Masurel >or=3) was significantly (P or=3 was also significantly reduced in the oxygen group (P < 0.001). Oxygen breathing before submarine escape reduces initial bubble scores, although its significance in reducing central nervous system DCS needs to be investigated further.