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.

Efficient 7D aerial pose estimation

Abstract: A method for online global pose estimation of aerial images by alignment with a georeferenced 3D model is presented. Motion stereo is used to reconstruct a dense local height patch from an image pair. The global pose is inferred from the 3D transform between the local height patch and the model. For efficiency, the sought 3D similarity transform is found by least-squares minimizations of three 2D subproblems. The method does not require any landmarks or reference points in the 3D model, but an approximate initialization of the global pose, in our case provided by onboard navigation sensors, is assumed. Real aerial images from helicopter and aircraft flights are used to evaluate the method. The results show that the accuracy of the position and orientation estimates is significantly improved compared to the initialization and our method is more robust than competing methods on similar datasets. The proposed matching error computed between the transformed patch and the map clearly indicates whether a reliable pose estimate has been obtained.

Collaborative Command and Control Practice: Adaptation, Self-Regulation and Supporting Behavior

Abstract: This thesis concerns command and control (C2) work at the tactical level in emergency and crisis response operations. The presented research addresses two main research questions. The first question is whether it is feasible to simulate and study C2 work in the initial stages of response operations by means of role-playing simulations. If so, the second question is how to develop and execute role-playing simulations in order to explore this type of C2 work in a methodologically sound way. The presented research is based on simulations as methodological means for qualitative research. The utilized simulation approach is scenario-based real-time role-playing simulations grounded in models of C2 work and response operations. Three simulations have been conducted based on this methodology and are reported in this thesis. Simulation I focused on the work practice of cooperating commanders whose activities may be enhanced by the use of artifacts. Simulation II concerned the issues of operationalizing advanced technological artifacts in rapid response expert teams. Simulation III gave attention to the role improvisation in C2 teams designated for international operations. The results from the simulations and from the work conducted and presented in this thesis contribute with knowledge and experience from using role-playing simulations to study C2 work. This includes the methodological aspects of designing and conducting role-playing simulations such as scenarios, realism, evaluation and simulation format and control. It also includes the identification of the main application and problem areas for which the methodology is suitable, that is explorative qualitative inquiries and evaluation studies. The thesis provides new insights in C2 work with respect to adaptive behavior and improvisation. The thesis also identifies areas that need to be considered in order to further develop the role-playing simulation approach and its applicability.

Dynamic testing and simulation of hybrid joined bi-material beam

Abstract: A specimen is developed for real-like low velocity impact testing of bi-material joint configurations. Six different joint configurations are analysed. Two engineering adhesives are evaluated with and without discrete mechanical fasteners, i.e. adhesive and hybrid joints. Experiments and simulations are performed. The simulations are performed using adhesive cohesive finite elements. Simulations show good agreement with experiments in impact energy and overall deformation mode. The histories of applied load vs. load-point deflection show reasonably good correlation. The results show that the impact energy consumption depends on the joint integrity. A threshold value for the fracture energy of the adhesive seems to exist. Beneath this value, adhesive and discrete fastener work together increasing the impact energy capacity. Above this value the discrete fastener has a negative effect, and may be regarded as a stress concentration.

Categorization of real-time software components for code size estimation

Abstract: Background: To estimate Software Code Size early in the development process is important both for Cost/Effort estimation and electronic hardware design reasons. The COSMIC FSM (Functional Size Measurement) method treats the intended software to be measured as a black box, and measures CFP (COSMIC Function Points) based only on data movement in and out of the software. Therefore, CFP can be measured on requirements defined early, and be used to estimate Code Size if there exists a strong correlation between CFP and Code Size. We have conducted four experiments in the automotive industry showing strong correlation between CFP and implemented Code Size in Bytes. All four experiments, of which two have not been published before, show equally strong correlation but the linear relationship is different between the experiments.Goal: This paper aims to identify the factors affecting the linear relationship. With these factors, we can categorize new requirements to be measured and select the proper linear relationship to convert CFP into Bytes, i.e. estimate Code Size.Method: We replicate our earlier experiments with software components of new types, and review the results from all our experiments. Potential factors affecting implemented Code Size are identified by performing open-ended interviews with domain experts.Results: We have in the automotive industry identified a set of factors that can be used to categorize the software components we want to measure; functionality type, quality constraints, and development methods and tools.Conclusions: COSMIC can produce accurate Code Size Estimates provided that sub-sets of cohesive and uniform requirements can be identified. Moreover, similar requirements must have been measured before to establish the linear relationship between CFP and Bytes. Finally, the sub-sets of requirements need to be able to categorize based on factors that affect the linear relationship. With this approach, even complex calculations can be measured, provided that they are proportional to the number of data movements.