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.

Adaptation of foliage penetration radar to remove interference to in-band communication

Abstract: Methods are described enabling low frequency ultra wide band foliage penetration (FOPEN) radar signals to be notched at the precise frequencies of conflict with in-band wireless services. The goal is that radar transmit power levels should be on par with environmental noise for receivers of these services, implying that no degradation of the services will be perceived.

Visualization and Reduction of Mutual Coupling Between Antennas Installed on a Platform

Abstract: Mutual coupling, or equivalently, the isolation between antennas, is a key parameter in antenna system design. In this work, the previously defined impedance density is generalized, and it is demonstrated how it can be used to obtain spatial information about the mutual coupling. The generalized impedance density is a real-valued scalar and it can be visualized as a three-dimensional density in space. It is shown that there is a strong connection between regions with a positive (negative) generalized impedance density and a decrease (increase) of the coupling when an absorber is placed in that region. This predictive ability is a useful feature, which is tested for three numerical cases. The results are robust to the shape of the platform, and it can be compared across frequencies. By placing absorbers based on the generalized impedance density, it is possible to reduce the required amount of absorbers needed to obtain a certain reduction in mutual coupling. The visualization results and predictions of absorber positions are compared with a Poynting vector based method. Placing absorbers based on the generalized impedance density had a larger impact on the mutual coupling, compared to the predictions with the Poynting vector based method in the investigated cases.

A Composite Right/Left-Handed Transmission Line Implementing Quasi-Exponential Inductive Stubs

Abstract: This paper proposes a composite right/left-handed (CRLH) transmission line structure implemented on microstrip and composed of interdigital capacitors and quasi-exponential inductive stubs (QEIS's). By replacing the more commonly used uniform transmission line stubs with QEIS's; the left-handed (LH) operating frequency band is increased.

Workload of a collision avoidance system for remotely piloted aircraft

Abstract: Active air traffic controllers and remotely piloted aircraft pilots were studied in a real time simulation providing results on actual and desired behaviour of the studied concept of a mid-air collision avoidance system in an air traffic control environment. The workload for the studied system seems to be acceptable at this state, and no major concerns regarding workload were found during the simulations. However, areas where the studied concept may be improved were identified concerning for instance suggested manoeuvre. A general conclusion from the simulations was that it is important that the D&A-system is correctly designed in regard to sensitivity.

Influence Of Domeheating On Offset And Gain Correction In An IR-CCD Missile Seeker

Abstract: Dome heating effects in an IR-CCD missile seeker have been investigated. The background radiation as a function of time after launch and the charge generated in the IR-CCD storage well has been calculated for two dome materials. Demands on the signal processing in order to maintain an optimized seeker sensitivity and dynamic range during the flight envelope are also discussed.