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.

A method for correlating and numbering target tracks from multiple sources

Abstract: The invention relates to a method for correlating target tracks (14) from multiple track sources into a single situation picture (15). Here the track sources are comprised of various sensors (11) and target tracking systems (12). The track correlator (13) embodies the new correlation method, which, unlike previous art, is based on correlating the tracks (14) to target numbers. A large number of correlation hypotheses are evaluated along with the probability for each hypothesis. The method runs recursively: existing probabilities are propagated until the current point of time, and then new probabilities are computed, e.g. using Bayes' rule, according to how well each hypothesis fits with the observed track data. To reduce the number of hypotheses that have to be handled individually, a simplified scheme is introduced where each track (14) is characterized by one (or more) target number and the corresponding probability, and where each target number is characterized by the probability that it represents a real and trackable target. The simplified representation is particularly useful for distributed correlation, where a number of correlators run at different sites, to form a common situation picture with common track numbers. Further, as the number of hypotheses can be very large, methods for just evaluating the most plausible hypotheses have been suggested.

Method and arrangement for a low radar cross section antenna

Abstract: A low-radar cross section antenna structure for an active electrically scanned antenna including an active electrically scanned antenna enclosure and at least two antenna elements. The antenna elements are arranged to be mounted on a front surface of the active electrically scanned antenna enclosure and embedded in a lightweight structure. The front surface and side surfaces of the active electrically scanned antenna enclosure and the antenna elements are arranged to be covered with the lightweight structure. A thin laminate is arranged to cover an outer top surface and an outer side surface of the lightweight structure. Parts of the lightweight structure are arranged to be doped with a lossy material having dielectric, magnetic and/or resistive losses, thus making these parts of the lightweight structure absorbing for electromagnetic radiation.

An Air-to-Ground Combat Survivability Model

Abstract: A survivability model can be a useful component of a tactical support system able to aid fighter pilots to assess the risk of getting hit by enemy fire from ground-based threats. This work identifies three desirable properties of such a model: it should allow for evaluating actions; it should enable domain experts to incorporate their knowledge; and it should represent uncertainties both regarding the locations of the threats as well as their future actions. A survivability model is suggested, which calculates the probability that the aircraft can fly a route unharmed and allows for routes of different lengths to be compared. A domain expert can describe the threats by specifying the risk of getting hit at a position of the route without having to consider the earlier actions of the aircraft and the threats. Three different threat models are suggested and compared. The influence of uncertainties regarding the positions of the threats is studied by calculating the probability density function for the survi...

Arrangement and method for launching counter-measures

Abstract: The invention relates to a method for launching counter-measures (5), such as flares and chaff, from a launch opening (14) of a dispenser (2) mounted on an aeroplane (1 ). The counter-measures (5) are launched in a direction obliquely forwards and downwards relative to the aeroplane, and in order to facilitate launching of counter- measures (5), a low dynamic pressure is created permanently across the launch opening (14) of the dispenser (2) by means of fixed means (24) acting on the air stream. The invention also relates to an arrangement for storing and launching counter-measures (5), such as flares and chaff, comprising an elongate body (8) provided with at least one launch opening (14) used for storing the counter-measures (5) in compartments (11.1,11.2 11-n), the arrangement being designed to be mounted on an aeroplane (1 ), with the longitudinal direction of the elongate body (8) essentially coinciding with the flight direction of the aeroplane (1), and the counter- measures (5) being connected to a firing control unit for feeding firing signals to the counter-measures. The arrangement is designed to be mounted under the aeroplane (1 ), and in that the compartments (11.1,11.2 11 -n) are provided with openings (18.1,18.2,..., 18. n) and are intended for launching the counter-measures (5) in a direction obliquely forwards and downwards relative to the aeroplane (1 ).

Fast forming of multistacked UD prepreg using a high‐pressure process

Abstract: In this article, the opportunities of fast forming of multistacked UD prepreg when using high-pressure forming were examined in an experimental study. Forming is often considered a bottleneck in ma ...