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.

Method and device for aligning sight and barrel

Abstract: The present invention relates to a method and an arrangement for use with a barrelled weapon for aligning the centre line of the barrel (2) with the weapon’s sight (3). The invention is primarily intended to be used with such barrelled weapons (2) as are mounted on a gun carrier 81), such as a tank or the like, and which have a sight (3) that is mounted separately on the gun carrier (1). The invention is characterized in that, during aligning, an image-generating sensor (9) is used as reference for the centre line of the barrel, which image-generating sensor is moved forward through the barrel from its breech to a position immediately inside its muzzle, and which image-generating sensor has its line of vision along the direction of fire of the barrel.

Dispenser system for discharging countermeasure means

Abstract: A dispenser system for a platform. The dispenser system is configured to be mounted to the platform and connected to power- and control-system of the platform. The dispenser system includes a dispenser for countermeasure boxes. The dispenser is configured for non-pyrotechnic dispensing and opening of the boxes. Each box is sealed by a detachable closure that includes a first opening member and at least one passive, second opening member stationarily fixed to the dispenser, which is provided with a motor gear. The first and second opening members are configured for detaching the closure by mutual interaction simultaneously as each box under the influence of the motor gear is launchable from the dispenser.

A method for ensuring backup function to an electrical system in a vehicle and an electrical system as such

Abstract: The present invention relate to a method and an electrical system for a vehicle comprising a digital information carrier (3) to send digital data on; a first computing device (1) arranged to execute an installed first application software (P 1); and a second computing device (2) comprising an installed backup application software (P1'), identical to the first application software (P1), wherein the second computing device (2) is configured to execute an installed second application software (P2), different from said first application software (P1) and that said second computing device (2) is configured to initiate an execution of the installed backup application software (P1') when an error occurs in the first computing device (1) in parallel with the execution of the second application software (P2).

Method and arrangement for estimating at least one parameter of an intruder

Abstract: A method for estimating, from a platform, at least one parameter of an intruder. Consecutive frames of image data at different times of the intruder utilizing at least one passive sensor are generated. A direction from the platform to the intruder is determined based on the generated consecutive frames of image data. A time period remaining until a potential collision between the platform and the intruder is estimated. An angular extent of the intruder, as viewed by the passive sensor, is estimated based on the image data. At least one of a first relative location vector to a minimum intruder associated with the intruder or a second relative location vector to a maximum intruder associated with the intruder is estimated. An arrangement for generating input data to a sense-and-avoid system on-board a platform, a computer program, a computer program product and a platform carrying the arrangement are also provided.

Standby attitude estimation

Abstract: In most military aircraft an inertial navigation system (INS) is the main source for attitude and heading data. Aircraft attitude and heading are important quantities, and in the case of a failure in the INS, backup values are needed. We here present how these can be calculated using other sensors in the aircraft. In order to determine attitude and heading with respect to a reference coordinate system, the same quantities in both the aircraft body coordinates as well as in the reference coordinate system are needed. These can then be used to determine the rotation from reference to body coordinates and thus the attitude and heading of the aircraft. We show how data from various sensors in the Saab Gripen aircraft, can be used to generate quantities exhibiting such relations. These relations are analyzed using recorded flight data. Using vector relations the QUEST algorithm yields a least squares fit of the quaternion of rotation from reference to body coordinates. We show here an alternative and simpler approach to such an algorithm in quaternion space. The REQUEST algorithm is an extension to the QUEST algorithm that processes measurements recursively. In the REQUEST algorithm angular velocities can also be used between measurements to update the quaternion of rotation. We extend our alternate approach in a similar way, but we also solve the case were additional states besides the quaternion rotation are introduced. The angular velocities used in a system of this type are often of poor quality, and states representing e.g. bias can thus be introduced.