Saab AB

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

A Language and Repository for Cyber Security of Smart Grids

Abstract: Power grids form the central critical infrastructure in all developed economies. Disruptions of power supply can cause major effects on the economy and the livelihood of citizens. At the same time, power grids are being targeted by sophisticated cyber attacks. To counter these threats, we propose a domain-specific language and a repository to represent power grids and related IT components that control the power grid. We apply our tool to a standard example used in the literature to assess its expressiveness.

Safetying device for firing mechanism for aircraft ejection seats

Abstract: Ejection seat propulsion mechanism has a firing pin normally held cocked by a latching member that has one lost motion connection with an ''''eject'''' handle element, another with an element actuated by jettisoning of a canopy over the seat. Motion of either element alone does not move the latching member but renders the connection operative for firing pin release by subsequent or simultaneous motion of the other element. Canopy jettisoning can be effected by the handle, which actuates a switch, or by a separate canopy jettison knob. Actuation of an auxiliary handle, moved from an inaccessible to an accessible position by actuation of the ''''eject'''' handle, gives a second motion to the handle element for ejection through the canopy.

Radar system and method for detecting and tracking a target

Abstract: A radar system for detecting and tracking at least one target utilizing a mechanically rotated two-dimensional radar antenna system with a fan-shaped beam arrangeable on a non-stable radar platform. The radar system includes a tracking filter configured to estimate an azimuth angle of the at least one target with respect to a fixed reference coordinate system based on: azimuth angle information of at least one target radar return signal measured utilizing the radar antenna system with respect to a local coordinate system of the radar platform, and radar platform relative orientation with respect to the fixed reference coordinate system at the time of the at least one target radar return signal, such that a software-based motion-compensation of the radar platform is provided.

Shell with multi-charges

Abstract: A joint for a shell with at least a first charge unit and a second charge unit arranged in series one after the other is provided. The charge units include one shaped charge each. The charges are designed to be detonated one after the other with a time separation between the detonations. In order to suppress the interference to an undetonated charge by a shock wave generated by the detonation of a previously detonated charge, the joint that connects the charge units has been designed in a special way. The joint includes a damping section parallel to the longitudinal axis of the device, that mechanically fastens together the two charge units. In addition a rigid support device is connected to the damping section and dimensioned so that when the damping section is in an unstressed state there is a clearance in the longitudinal axis of the device between the two charge units.

Bandpass Filter With Tunable/Switchable In-Band Interference Rejection

Abstract: This letter presents a wideband bandpass filter (BPF) with a tunable and switchable in-band notch. This allows the RF front end to pass the signal of interest uninterrupted in the absence of an in-band interferer and reject part of the passband in case a narrowband interferer exists. The BPF is based on a two-path architecture, loaded with resonators on one of the paths to deliver an absorptive notch. The resonators are tuned with varactor diodes and are deactivated when the diodes are in forward bias. The implemented proof-of-concept hardware operates in the 4.8–7.8-GHz frequency range, with an in-band notch tunable between 5 and 6.25 GHz, when activated. The transmission lines were implemented as striplines, resulting in a measured insertion loss of 0.6 dB.