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.

Spurious-free flexible frequency converter and a satellite communication repeater architecture

Abstract: A method for frequency conversion within a satellite-based repeater system, comprising the steps of receiving an uplink radio frequency signal (RF) having a frequency f RF, generating a first (LO1) and at least a second (L02) local oscillator signal having frequencies f LO1 and f LO2, respectively, mixing at a first frequency conversion stage said uplink signal (RF) with said first local oscillator signal (LO1) to generate an intermediate signal (MF) having a frequency f MF , and, at a second frequency conversion stage, mixing said intermediate signal (MF) with said at least second local oscillator signal (LO2) to generate a downlink signal (IF) having a frequency f IF , wherein the generation and mixing of said signals (LO1, LO2, RF, MF) are performed such that: f LO �¢ 1 �¢ and f LO �¢ 2 > f RF �¢ and f IF f MF �¢ = f LO �¢ 1 - f RF , and f IF �¢ = f LO �¢ 2 - f MF

Method of forming a composite structure

Abstract: A method of manufacturing a composite structure including a plurality of sheets and a radius filler. The radius filler is adapted to fill a gap at least partially formed by the sheets of the composite structure. The radius filler includes a plastic material with a first curing temperature. The sheets include a plastic material with a second curing temperature. The method includes arranging the sheets in a desired shape, applying the radius filler material into the gap, exposing the sheets and the radius filler material to the first temperature, whereby the material of the radius filler cures, and exposing the sheets and the radius filler to the second temperature, which exceeds the first temperature, whereby the material of the sheets cures. A radius filler for filling gaps between sheets of a composite structure. The material of the radius filler has a curing temperature which is below the curing temperature of the sheets of the composite structure.

A Wide Coverage S-Band Array with Dual Polarized Connected Bowtie Antenna Elements

Abstract: A low profile dual polarized bowtie antenna element is studied for an S-band (3 GHz) wide-scan application in a large-scale (nearly an infinitely large) uniformly excited phased array. The study shows that the array with such elements, when connected, is capable of scanning up to ±75° at E-plane and ±15° at H-plane for horizontal and vertical polarizations respectively. The bandwidth of the infinite array with such elements across these scan angles is 10% and 25% for the active reflection coefficient of −10 dB and −5 dB respectively.

Distributed avionics system and method for backup handling in an avionics system

Abstract: The present invention relates to a distributed avionics system (100, 500) having a plurality of computer nodes arranged to execute a plurality of partitions/applications (P1, P2, P3, P4, P5, P6). The distributed avionics system comprises reconfiguration means (332) arranged to reconfigure the distributed avionics system upon detection of failure in at least one of the computer nodes. Each partition/application is associated to a application/partition availability level. The reconfiguration means are arranged to reconfigure the distributed avionics system based on the partition/application availability levels of the partition/applications (P1, P2, P3, P4, P5, P6). The present invention further relates to a method for back-up handling in a distributed avionics system having a plurality of computer nodes (A, B, C).

A three dimensional model method based on combination of ground based images and images taken from above

Abstract: The present invention relates to a three dimensional model method based on combination of ground based images (54) and images (44) taken from above. According to the invention an existing 3D model (46) based on images (44) taken from above is matched with images (54) taken from ground level, all images comprising information about position and attitudes of the camera when the images (54) from ground level and the images (44) taken from above were taken and direction of each pixel. The method offers an automatically carried out imaging solving or at least mitigating occlusion problems.