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.

Array antenna system

Abstract: The invention refers to a method for an antenna system (1 ) comprising a transmitting phase array antenna (2) comprising a transmitting antenna subarray (TX) comprising a number Q antenna elements (3) transmitting on a first frequency and a receiving phase array antenna (4) comprising a receiving antenna subarray (RX) comprising a number P antenna elements (5). The transmitting antenna subarray antenna (TX) is positioned at a distance (D) relative the receiving antenna subarray antenna (RX) and the coupling between two antenna subarrays (TX, RX) are decided and used for controlling the transmitting subarray antenna (TX) to transmit in such a way that there will be nulling of the energy in the receiving antenna subarray antenna (RX) with respect to the transmitting antenna subarray (TX).

Comparing Air Mission Routes from a Combat Survival Perspective

Abstract: An aircraft flying inside hostile territory is exposed to the risk of getting detected and tracked by the enemy’s sensors, and subsequently hit by its weapons. This paper describes a combat survivability model that can be used for assessing the risks associated with a mission route. In contrast to previous work, the model describes both the risk of getting tracked and the risk of getting hit, as well as the dependency between these risks. Three different ways of using the model for comparing routes from a combat survival perspective are suggested. The survivability for the end point, i.e., the probability of flying the entire route without getting hit, is a compact way of summarizing the risks. Visualizing how the risks vary along the route can be used for identifying critical parts of the mission. Finally, assigning weights to different risks allow the opportunity to take preferences regarding risk exposure into account.

Method and apparatus for optimization and incremental improvement of a fundamental matrix

Abstract: A method and apparatus for generating and optimizing a fundamental matrix for a first 2D image and a second 2D image to obtain the relative geometrical information between said two 2D images for points in the two 2D images that correspond to a mutual 3D point. According to the method, the geometrical projection errors in the correspondence points are used to select correct and accurate inliers. This method and apparatus provides a more accurate and precise fundamental matrix than conventional methods.

Method and a calculating unit for calculation of a recovery flight path

Abstract: The invention relates to a method for calculating a flight path avoiding a collision with the ground when an aircraft dives towards the ground. The method includes receiving signals including information of a dive angle of the aircraft in relation to the imaginary ground plane, and a present roll angle of the aircraft, and calculating a flight path that avoids collision with the ground on the basis of the information. The calculation includes calculating a need for rolling the aircraft based on the present roll angle, and calculating a need for changing the direction of the velocity vector of the aircraft so that the change has a component in an upward direction in relation to the reference frame of the aircraft. The calculation of the need for rolling the aircraft is also based on the dive angle so that the calculated flight path turns sideways when the dive angle surpasses a specified dive angle and when the present roll angle is larger than zero degrees, and so that the flight path continues in a forward direction when the dive angle is below the specified dive angle. The invention also relates to a ground collision calculating unit, a computer program, and a computer readable medium.