Saab Automobile AB

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

CMOS devices and circuits for microwave and millimeter wave applications

Abstract: Recent results on characterization, modelling and circuit design based on 90/130 nm CMOS is presented in this paper Amplifiers, frequency multipliers, and mixers were realized for frequencies up to 60 GHz Circuit results based on two different transmission line approaches are reported Load-pull characterization of transistors at 9 GHz and 23 GHz are also reported with 250mW/mm and 150 mW/mm output power for a 90 nm and 130 nm CMOS technology respectively Initial studies of FINFETs promise feasibility of analogue circuits up to millimetre wave frequencies

Use of complex cross-flow representation in nonplanar oscillating-surface theory.

Abstract: In the formulation of the nonplanar oscillating-surface problem, a complex variable is introduced instead of the two transversal coordinates. Thereby, a compact relation is obtained between the complex transversal velocity, which replaces the two transversal velocity components, and the chordwise integrals, whose integrands are products of the pressure jump and part of the kernel. A particular approach for numerical evaluation of these integrals is also considered. The remaining spanwise integrals are evaluated through interpolation by the aid of Jacobi polynomials. This interpolation, together with the complex representation, leads to a generalization of the Multhopp procedure. Corresponding integration coefficients are determined by Jacobi's functions of the second kind for complex arguments.

The probability of near midair collisions using level-crossings

Abstract: We consider probabilistic methods to compute the near midair collision risk using state estimate and covariance from a target tracking filter based on angle-only sensors such as digital video cameras. Existing work is only concerned with risk estimation at a certain time instant, while the focus here is to compute the integrated risk over the critical time horizon. This novel formulation leads to evaluating the probability for level-crossing. The analytic expression for this involves a multi-dimensional integral which is hardly tractable in practice. Further, a huge number of Monte Carlo simulations would be needed to get sufficient reliability for the small risks that the applications require. Instead, we propose a sound numerical approximation that leads to a one-dimensional integral which is suitable for real-time implementations.

Method and apparatus for tdoa-locating with reduced data rates

Abstract: A method and an apparatus for TDOA-locating of an unknown emitter of RF-signals are provided, wherein the amount of data that have to be transmitted from the sensor devices to the processing centre of the locating system is greatly reduced. According to the invention the signals received at the sensor devices of the locating system are synchronized, sampled and autocorrelated. The autocorrelation function thus obtained is divided into segments of an appropriate duration. The maximums of the autocorrelation function in each segment provide a unique characterizing feature of the time of arrival of the RF-signals at each sensor device. The maximums of the autocorrelation function are transmitted to the processing centre of the system. The travelling time difference of the sensor signals needed for locating the unknown emitter are simply computed by the differences of the transmitted maximums.