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.

Design considerations for a modern naval fire control radar

Abstract: This document describes some design considerations for a modern naval fire control and tracking radar. The main purpose of this type of system is to track one, or sometimes a few, targets extremely accurately. Some of the basic design considerations have not changed considerably over the years, even if the solution is different due to e.g. increased processor capacity. This paper will briefly outline some of these basic considerations but will concentrate on the areas where new considerations affect the design.

Geometric compensation of convex forming tools for successful final processing in concave cure tools – An experimental study

Abstract: To enable shimless composite part assembly it is desired to manufacture composite spars in concave, female tools. However, due to restricted access this process is often associated with a high degr ...

On the FDTD Near-to-Far-Field Transformations for Weakly Scattering Objects

Abstract: Recently published papers on the near-to-far-field (NTFF) transformation in the finite-difference time-domain (FDTD) method have demonstrated accuracy improvements for weakly scattering objects. The improvements are achieved by modifications of the “standard” NTFF transformation which is based on interpolation of the spatially shifted fields in the FDTD grid. In this paper, it is shown that accurate results can be obtained for such weakly scattering objects without the suggested improvements, provided that the correct FDTD NTFF transformation is used. “Correct” is referred to a transformation procedure that is consistent with the FDTD version of the equivalence principle. This NTFF transformation procedure was published in the IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION in 1998. Recently published results for weakly scattering objects have been reproduced using this NTFF transformation.

A study on human response to aircraft vibrations in-flight

Abstract: An attempt is made to link the subjective evaluation of vibrations with objective measurements in the laboratory and in-flight. For the purpose of this study high levels of vibrations were intentionally introduced in the aircraft. It is found that the vibrations in the controlled environment are easily discerned whereas in the more complex environments such as prevailing in an aircraft, the results seem to be affected by other environmental parameters. One of the most important aspects of aircraft interior environment is ride comfort. Ride comfort can span from the quality of aircraft seats to the integrated subjective appraisal of the quality of the flight. A major program in interior sound and vibration quality is being carried out at Saab AB in collaboration with Chalmers University of Technol-ogy. The overall objective of the project is to model aircraft cabin comfort by linking the subjective evaluations with objective measurements. This paper describes some results from the subjective testing of quality of vibrations during flight as well as in the laboratory. An attempt is made to correlate the human response to vibrations measured in the laboratory and in-flight.

A double-curved cover for covering a gap between two structural portions of an aircraft

Abstract: The present invention regards a cover for covering a gap (2) between a first structural portion (3, 3 ') and a second structural portion (5, 5') of an aerial vehicle (29, 41 ), the cover (1, 25) comprises a first attachment section (9), attachable to the first structural portion (3, 3'), and a second flexible section (11) for covering the gap (2), the second flexible section (11) includes an abutment portion ( 13) for abutting against the second structural portion (5, 5 ') in an operating state. The abutment portion (13) in an unloaded state forms an undulating shape (U) having troughs (15) and crests (17) extending along a curved plane, the curvature of which essentially corresponds with the curvature (C) of the second structural portion's (5, 5') surface (6, 27), wherein the troughs (15) are provided for engagement with said surface (6, 27) in said operating state in such way that they tend to be flatten out and propagate over said surface (6, 27) pressing down neighbouring crests ( 17) towards said surface (6, 27) for providing a close fit between the cover (1, 25) and the second structural portion (5, 5').