Saab AB

About: Saab AB is a company organization based out in Thun, Switzerland. It is known for research contribution in the topics: Signal & Antenna (radio). The organization has 862 authors who have published 928 publications receiving 8807 citations. The organization is also known as: Saab AB & Svenska Aeroplan AB.

Peekaboo: A gray hole attack on encrypted SCADA communication using traffic analysis

Abstract: We consider a potential gray hole attack against SCADA substation to control center communications using DNP3. We propose a support vector machine-based traffic analysis algorithm that relies on message direction and timing information only, and we use trace-based simulations to show that even if SCADA traffic is sent through an encrypted tunnel, as often done in practice, the gray hole attack can be effectively performed based on the timing and direction of three consecutive messages. Our results show that the attacker does not need accurate system information to be successful, and could affect monitoring accuracy by up to 20%. We discuss possible mitigation schemes at different layers of the communication protocol stack, and show that a minor modification of message timing could help mitigate the attack.

A target locating method and a target locating system

Abstract: The present invention relates to a target locating method and a target locating system. The invention solves the problem to determine coordinates of targets at long distances with high accuracy. According to the invention this is solved by recording (20) images of a target area by means of recording devices carried by a vehicle, matching (23) the recorded images of the target area with a corresponding three dimensional area of a three dimensional map (22) comprising transferring a target indicator, such as a reticle, from the recorded images of the target area to the three dimensional map of the corresponding target area (25), reading the coordinates (26) of the target indicator position in the three dimensional map, and making (27) the read coordinates of the target indicator position available for position requiring equipment (28).

Magazine, cartridge and method for variable projectile cluster density of a countermeasure

Abstract: A magazine for storing and launching countermeasures arranged in cartridges, comprising a plurality of longitudinal cartridge cases forming the magazine, where the magazine comprises a tilting means adapted to tilt the cartridge cases, such that the openings of the cartridge cases can be directed in a selected direction, and where a countermeasure comprises multiple projectiles, and where the magazine is adapted to launch a first countermeasure and a second countermeasure, where the projectile cluster density of the first countermeasure is lower than the projectile cluster density of the second countermeasure. The advantage of the invention is that a countermeasure can be directed towards an incoming object and can be adapted for the distance to the object before it is launched.

Evaluation of switching losses in magnetic amplifiers as an alternative to IGBT switching technologies

Abstract: In future more electric aircraft (MEA) applications increased requirements of power levels stress the importance of low losses in converters and switching elements. In this work the losses of transistor switches are analysed and compared with the losses in magnetic amplifiers (Magamp) where amorphous alloy properties allows design of competitive devices. More Electric Aircraft technology can take advantage of this to accomplish compact, robust and reliable systems with low losses. Magamps are already used in the power supply of the Electronic Flight Control System in the Swedish "Gripen" fighter-aircraft. This paper presents a comparison between Magamp technology and an alternative Insulated Gate Bi-polar Transistor (IGBT) design. The study is concentrated on the power losses in a proposed 10 kW converter with ± 270 VDC (540 VDC) regulated output, where the fundamental difference between the switching elements is that the magnetic switch handles AC and the IGBT handles DC. To allow comparison, the copper and magnetic losses in the magnetic switch of the magnetic amplifier are considered as equivalent to the switching and conduction losses in the IGBT. The comparison is based on the sum of losses in power converters comprising six switching elements.

Test activities in the continuous integration and delivery pipeline

Abstract: Based on 25 interviews with participants from four case study companies that develop large-scale software embedded systems, this paper presents the Test Activity Stakeholders (TAS) model. The TAS model shows how the continuous integration and delivery pipeline can be designed to include test activities that support four stakeholder interests: “Check changes,” “Secure stability,” “Measure progress,” and “Verify compliance.” The model is developed to show how each of the stakeholder interests are best supported by unit/component tests or system tests, by automated testing or manual testing and by tests executed in simulated environments or on real hardware. The TAS model may serve as a starting point for companies when evaluating and designing their continuous integration and delivery pipeline. The validation of the TAS model included twelve individuals from three case study companies. The validation showed that the TAS model is actionable and useful in practice, enabling the identification of stakeholders and showing where improvement efforts should be focused in order to support all stakeholder interests in the continuous integration and delivery pipeline.