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.

Rebalancing of underwater vehicles

Abstract: The present disclosure relates to a rebalancing device (100) for rebalancing of an underwater vehicle comprising at least one thruster and at least one storage space. The rebalancing device (100) comprises control circuitry (140). The control circuitry (140) is configured to receive sensor data comprising information relating to a depth and an attitude of the underwater vehicle, and thruster data comprising information relating to thrust and orientation of thrust of the at least one thruster. The control circuitry (140) is further configured to determine a difference between a centre of gravity, CoG, of the underwater vehicle and a centre of buoyancy, CoB, of the underwater vehicle based on the sensor data and the thruster data, and to determine a difference between a gravitational force acting on the underwater vehicle and a buoyancy of the underwater vehicle based on the sensor data and the thruster data. The control circuitry (140) is also configured to generate rebalancing information relating to a deviation of a current load distribution from an ideal load distribution based on the determined differences. The present disclosure also relates to corresponding underwater vehicles, methods and computer programs.

Shock absorbing arrangement configured to withstand impact shock

Abstract: The present disclosure relates to a shock absorbing arrangement suitable e.g. for ship installed structures comprising a rod, a resilient member arranged in connection to the rod, a structure element and a locking member arranged in connection to the structure element. The locking member is arranged to detachably lock the structure element at a resting position at the rod and the locking member, or the structure element, is supported by the resilient member. The resilient member is configured such that a spring force of the resilient member acts to maintain the structure element essentially at the resting position at the rod. The locking member is further configured to release the structure element from the resting position when being exposed to a force exceeding a predetermined holding force, whereupon the resilient member acts to reinstate the locking of the structure element at the resting position at the rod. The present disclosure further relates to a shock absorbing structure comprising such shock absorbing arrangements.

Arrangement for locking arming conditions

Abstract: An arrangement for locking arming conditions to prevent unintentional arming of SAI-units of ammunition units when the ammunition unit is subjected to external threats. A ring shaped shape memory alloy is provided in cooperation with a recess in a plunger arranged in connection to the SAI-unit and a fixed recess to prevent the plunger from axial movement when subjected to heating by changing the shape of the essentially ring shaped shape memory alloy to lock the plunger relative to the fixed recess.

Constraint Aware Dynamics in target tracking

Abstract: This paper addresses the problem of tracking targets in the presence of spatial constraints, typically in ground or littoral environments. It has been observed that manned targets move in a way avoiding constraints, e.g. roadsides. For best tracking accuracy and reliability, especially in cases of sparse measurements, this fact ought to be reflected in the dynamic equations of motion. We develop a simple model, based on constant speed assumptions, realize it in a particle filter, and evaluate the performance in a scenario where a vessel moves in a narrow channel.