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.

Display media for helmet-mounted displays

Abstract: The requirements on Helmet Mounted Displays regarding display media has historically been focused on brightness. The CRT has been the only technology available to fulfil that requirements. Today we see a number of new technologies where the brightness is not the major issue. But even when we find a display media that can handle sunshine on white clouds we still have other requirements that need to be managed. This paper will discuss some additional requirements and how new display media manage these requirements.

Single scan multi-target tracking using joint state particle filters

Abstract: In this paper, we compare some of the existing joint state particle filtering algorithms for closely spaced target tracking problem. Both maximum a posteriori (MAP) and minimum mean square error (MMSE) estimation outputs of four different algorithms are compared. We also include comparison of a non-joint state particle filter and Kalman filter for a baseline. Simulation results show that claimed performance of MAP based output is misleading and non-joint state particle filtering seems more appealing in terms of estimation performance than joint state counterparts.

Simulation of cavitation and pressure surge caused by rapid valve closure. An engineering approach

Abstract: formation of gaseous products, cavitation, introduces severe non-linearity not only in the form of damped pressures but also lower propagation speed. The linear relation between bulk modulus, pressure, and density that exists in high pressure systems is made non-linear by the formation of gases. This paper describes a simulation method for predicting pressure surges in aircraft fuel systems that is suitable for engineering purposes. A model for gas formation has been developed. The dynamic simulation is a relatively fine, one-dimensional, discrete distribution of the fluid solved with MacCormack’s predictor corrector technique. The simulation results are compared to actual fuel rig tests. There is a step-by-step description of how the simulation model was tuned to correlate with measured data. Some examples of practical use of the model for actual simulations used for fuel system design are included.

Arrangement and method for cross-monitoring of data

Abstract: An arrangement for cross monitoring two independent signals. The arrangement a calculator configured to calculate a value depending upon a signal value, a drift value and a feedback value, and a determining unit configured to determine a larger of the calculated value and a first predetermined value. The arrangement also includes a comparing unit configured to compared the determine larger value with a second predetermined value and a delaying unit configured to delay the determined larger value and change status of the larger value to become an updated feedback value to be provided to the calculator. The arrangement is characterized in that the signal value includes information about an absolute value of a difference between the two independent generated signals.

Method and transceiver for network diversity in long distance communications

Abstract: A method in a main node(210) for communication with a destination node (220) over long distances, the method comprising the steps of synchronizing the use of at least one communications resource (270) with an auxiliary node (230), and also generating a main signal (240) and an auxiliary signal (250) from an information quantity, as well as transmitting the main signal (240) to the destination node (220) by the at least one synchronized communications resource, and also transmitting the auxiliary signal (250) to the auxiliary node (230) by the at least one synchronized communications resource.