Saab Automobile AB

About: Saab Automobile AB is a based out in . It is known for research contribution in the topics: Radar & Signal. The organization has 760 authors who have published 890 publications receiving 11811 citations.

Physical bounds on the all-spectrum transmission through periodic arrays: oblique incidence

Abstract: The performance of a low-pass screen designed to block electromagnetic waves in a stop band is shown to have an upper bound defined by the static electric and magnetic polarizability per unit area of the screen. The bound is easy to calculate for all angles of incidence and polarizations, and applies regardless of how complicated the screen's microstructure is. For a homogeneous dielectric sheet the bound for TM polarization is more restrictive than the bound for TE, but this is not generally true for a screen with microstructure. The results are verified by measurements and simulations of oblique transmission through an array of split ring resonators, printed on a dielectric substrate.

Device for the selective detection of objects

Abstract: Un dispositif pour la detection selective d'objets, tels des aeronefs, missiles, helicopteres et similaire, au moyen de rayons emanant des objets, de preference des rayons infrarouges, comporte au moins une unite de detection (1). A device for the selective detection of objects, such as aircraft, missiles, helicopters and the like, by means of rays from the objects, preferably IR rays, comprising at least one detection unit (1). Ce dispositif comporte au moins deux entrees optiques situees a distance l'une de l'autre sur une ligne de mire allant du dispositif a l'objet. This device comprises at least two optical entrances arranged at a distance from each other on a sight line from the device to the object. L'unite de detection (1) comprend au moins un moyen de focalisation (15) destine a focaliser les rayons sur un plan focal. The sensor unit (1) comprises at least one focusing means (15) for focusing the radiation on a focal plane. L'unite de detection est equipee d'au moins un element detecteur (16) sensible au rayonnement et apte a emettre des signaux correspondant au rayonnement. The detection unit is equipped with at least one detector element (16) sensitive to radiation and able to emit signals corresponding to the radiation. Le dispositif est apte a balayer de maniere variable un angle de visee en azimut et/ou en elevation. The device is adapted to scan variably an angle of view in azimuth and / or elevation. Le dispositif comporte egalement une unite d'evaluation (2) apte a recevoir lesdits signaux. The device also comprises an evaluation unit (2) capable of receiving said signals. L'invention est caracterisee notamment en ce que l'unite d'evaluation (2) est apte a selectionner des objets qui lui semblent etre de taille similaire par rapport a l'angle mesure depuis la position du dispositif, d'une part des objets de grande dimension se trouvant a une distance eloignee, tels des aeronefs, etc., et d'autre part des objets de faible dimension situes a une distance rapprochee, tels des oiseaux, en supprimant des signaux dont l'amplitude en fonction de l'angle d'azimut ou d'elevation balaye est relativement grande compare a des signaux presentant une intensite relativement faible. The invention is particularly characterized in that the evaluation unit (2) is adapted to select objects that seem to be of similar size with respect to the angle measured from the position of the device, first objects Big dimension is at a remote distance, such as aircraft etc., and on the other hand small dimensions of objects at a close distance, such as birds, by suppressing signals whose amplitude as a function of the azimuth or elevation angle swept is relatively large compared to signals having a relatively low intensity.

Method for navigating a robot and arrangement at said robot

Abstract: The present invention relates to an arrangement and a method for guiding a missile (1) towards a target (2). The missile has information on its own position, velocity vector and future velocity profile and continuously receives information on the position and velocity vector of the target. The invention is characterised in that from the information on the missile and the target a point of interception (A) is predicted at which the missile is expected to strike the target. A flight time is then calculated which indicates the time that it will take for the missile to travel to the predicted point of interception (A). In addition a fictitious point of interception (B) is calculated which is situated at a higher altitude than the predicted point of interception and the distance of which to that point is related to the calculated flight time. Finally the missile velocity vector is directed towards the said fictitious point.

Flow pattern, heat transfer and pressure drop in flow condensation part II : Zeotropic refrigerants mixtures (NARMs)

Abstract: This paper, which is parr II of a study on flow condensation is focused on zeotropic (or non-azeotropic) refrigerant mixtures (NARMs) In the experiments, condensation in a horizontal tube of inner ...