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.

An Approximate Method for Calculating the Near-Field Mutual Coupling Between Line-of-Sight Antennas on Vehicles

Abstract: Calculating the mutual coupling between antennas on vehicles using full-wave simulations requires a vast amount of computer resources due to the electrical size of the structures. We therefore propose an alternative and approximate method to determine mutual coupling between antennas on vehicles for the case where there is line-of-sight (LOS) between the antennas. The proposed method is based on approximating the mutual coupling between LOS antennas on vehicles as near-field transmission between antennas in free space. We begin the analysis with a brief review of four methods for calculating the near-field free-space transmission. Of the investigated methods, we demonstrate that a nonsingular form of the near-field transmission integral originally proposed by Yaghjian (1982) is the most suitable for LOS antennas on vehicles. We introduce a modification to this method, in order to only use the antenna far-fields and geometrical separation to determine the mutual coupling. The comparison with full-wave simulations indicates that the proposed method has a good accuracy for LOS antennas. This paper ends with a full-scale mutual coupling calculation for two monopoles on an aircraft under LOS conditions, demonstrating a root mean square (rms) accuracy of 6 dB for frequencies up to 5 GHz, as compared with full-wave simulations.

Radar level gauge system and transmission line probe for use in such a system

Abstract: A radar level gauge system, for measuring a filling level of a content contained in a tank, said radar level gauge system comprising a transmitter arranged outside said tank and configured to transmit microwave energy, a receiver arranged outside said tank and configured to receive reflected microwave energy, and a transmission line probe, comprising at least one probe line, configured to guide transmitted microwave energy towards and from said content, said probe at least partly disposed inside said tank, wherein said transmission line probe further comprises a dielectric enclosing structure enclosing at least a substantial part of said at least one probe line, wherein said dielectric enclosing structure is arranged to reduce the microwave energy attenuating effect caused by said content to be gauged. An advantage with the above system is its improved accuracy when measuring a filling level of a content contained in a tank, as the attenuation introduced by the content is reduced by the dicloctric enclosing structure.

Transparency of Automated Combat Classification

Abstract: We present an empirical study where the effects of three levels of system transparency of an automated target classification aid on fighter pilots' performance and initial trust in the system were evaluated. The levels of transparency consisted of 1 only presenting text---based information regarding the specific object without any automated support, 2 accompanying the text-based information with an automatically generated object class suggestion and 3 adding the incorporated sensor values with associated uncertain historic values in graphical form. The results show that the pilots needed more time to make a classification decision when being provided with display condition 2 and 3 than display condition 1. However, the number of correct classifications and the operators' trust ratings were the highest when using display condition 3. No difference in the pilots' decision confidence was found, yet slightly higher workload was reported when using display condition 3. The questionnaire results report on the pilots' general opinion that an automatic classification aid would help them make better and more confident decisions faster, having trained with the system for a longer period.