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.

Near zone detection in radar level gauge system

Abstract: A method for processing a time domain reflectometry (TDR) signal used to determine at least one process variable for a material in a tank, wherein said TDR signal has been generated by a radar level gauge system comprising a pulse generator, a probe extending into the tank for guiding the pulse, and a receiver for receiving said TDR signal, and wherein the TDR signal comprises at least a surface reflection pulse caused by an interface between different materials in the tank, and an interfering pulse caused by a transition between the pulse generator and the probe. The method comprises obtaining a first sampled TDR signal with an amplification such that the interfering pulse is unsaturated, determining a compensation pulse signal using a previously stored pulse shape and a current pulse position, subtracting said compensation pulse signal from the first sampled TDR signal, determining if a surface reflection occurs in a zone where said interfering pulse has a significant interfering effect on any surface reflection pulse occurring in this zone, and, if no surface reflection occurs in this zone, updating the current pulse position.

Signal transmission and holding device for air-borne antennas of an rf-locating system

Abstract: An RF-locating system that uses airborne antennas on a captive balloon. It comprises a new design for reducing the weight of the signal transmission and holding device (payload of the balloon) for transmittance of broad-band antenna signals from the captive balloon to the signal processing equipment on the ground. As signal transmission line for the antenna signals a lightweight fibre optic cable is used having a protective covering reinforced by synthetic fibres. The fibre optic cable has a tensile strength sufficient to replace the stay rope for the captive balloon. The electronic signal transmission devices have been designed to minimise power requirements and for a reduced payload.

Solving the data-link bottleneck for MPEG location

Abstract: The aim of MPEG (Multi-Platforms Emitter Geolocation) is to use several measurements Angle Of Arrival (AOA) or Time Of Arrival/Frequency Of Arrival (TOA/FOA) from different Electronic Support Measures (ESM) platforms to determine an accurate emitter location. Sensors are geographically dispersed, and to combine the information that they acquire requires the information to be communicated to some location(s) where the data integration process occurs. The data link between the ESM platforms is expected to permit only very low data rates with a high latency. This means that the platforms can only exchange very restricted amounts of data. A potentially optimal way to compress the information when the measurements are noisy is to extract from the measurements an exhaustive statistic that summarizes all the information content at the local ESM. How to provide an exhaustive statistics for practical measurements system in the case of information fusion is presented. It is done either on Information Matrix form or based on a Taylor series expansion of the measurement in time or space.

Aurora — A Swedish High Altitude Rocket Project Study

Abstract: Project Aurora is a study regarding possible Swedish built sounding research rockets utilizing existing rocket motors originally developed for other purposes. The main elements of the Aurora rockets are one bigger and one smaller long-time burning rocket step and short-time solid propellant booster rockets. By combining, three variants are obtained, namely

Über die instationäre Überschallströmung durch Schaufelgitter mit Rückwirkung

Abstract: Die stationare Stromung durch ein Uberschallschaufelgitter mit Ruckwirkung in das Leitrad wurde in einer fruherern Arbeit [1] behandelt. Wenn man die Relativgeschwindigkeit zwischen Lauf- und Leitrad berucksichtigt, treten instationare Erscheinungen auf. Dabei kann man quasistationare und typisch instationare Erscheinungen unterscheiden. Die Quasistationaren haben praktisch die grosere Bedeutung und lassen sich ganz ahnlich wie die Stationaren behandeln. Der Hauptteil der Untersuchungen ist daher den typisch instationaren Erscheinungen gewidmet. The stationary flow through a supersonic cascade with reaction into the guide vanes has been treated in a previous paper [1]. If the relative velocity between rotor and guide vanes is taken into account, non-stationary phenomena emerge which may be classified as quasi-stationary and non-stationary proper, respectively. The quasi-stationary phenomena, which are the more important ones from a practical point of view, may be treated in much the same way as the stationary ones. Hence the main portion of the present investigation is devoted to the non-stationary phenomena proper.