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  • Public defence: 2017-03-31 00:00 Karlskrona
    Björklund, Svante
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences. Swedish Defence Research Agency (FOI ).
    Signal Processing for Radar with Array Antennas and for Radar with Micro-Doppler Measurements2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Radar (RAdio Detection And Ranging) uses radio waves to detect the presence of a target and measure its position and other properties. This sensor has found many civilian and military applications due to advantages such as possible large surveillance areas and operation day and night and in all weather. The contributions of this thesis are within applied signal processing for radar in two somewhat separate research areas: 1) radar with array antennas and 2) radar with micro-Doppler measurements.

    Radar with array antennas: An array antenna consists of several small antennas in the same space as a single large antenna. Compared to a traditional single-antenna radar, an array antenna radar gives higher flexibility, higher capacity, several radar functions simultaneously and increased reliability, and makes new types of signal processing possible which give new functions and higher performance.

    The contributions on array antenna radar in this thesis are in three different problem areas. The first is High Resolution DOA (Direction Of Arrival) Estimation (HRDE) as applied to radar and using real measurement data. HRDE is useful in several applications, including radar applications, to give new functions and improve the performance. The second problem area is suppression of interference (clutter, direct path jamming and scattered jamming) which often is necessary in order to detect and localize the target. The thesis presents various results on interference signal properties, antenna geometry and subarray design, and on interference suppression methods. The third problem area is measurement techniques for which the thesis suggests two measurement designs, one for radar-like measurements and one for scattered signal measurements.

    Radar with micro-Doppler measurements: There is an increasing interest and need for safety, security and military surveillance at short distances. Tasks include detecting targets, such as humans, animals, cars, boats, small aircraft and consumer drones; classifying the target type and target activity; distinguishing between target individuals; and also predicting target intention. An approach is to employ micro-Doppler radar to perform these tasks. Micro-Doppler is created by the movement of internal parts of the target, like arms and legs of humans and animals, wheels of cars and rotors of drones.

    Using micro-Doppler, this thesis presents results on feature extraction for classification; on classification of targets types (humans, animals and man-made objects) and human gaits; and on information in micro-Doppler signatures for re-identification of the same human individual. It also demonstrates the ability to use different kinds of radars for micro-Doppler measurements. The main conclusion about micro-Doppler radar is that it should be possible to use for safety, security and military surveillance applications.

  • Public defence: 2017-04-21 13:00
    Fredin, Sabrina
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    History and geography matter: The cultural dimension of entrepreneurship2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This dissertation deals with the rise of new industries through entrepreneurial activities. The aim is to investigate how differences in contexts might encourage or discourage entrepreneurial activities. This contextualization of entrepreneurship enhanced our understanding of when, how and why entrepreneurial activities happen.

    Entrepreneurship is recognized to be a spatially uneven process and, in addition to previous research that has examined the actions of individual entrepreneurs, we also need to understand the context in which entrepreneurship occurs. We have a good understanding of how structural conditions like industry structure, organization structure and agglomeration effects influence the context, but we know little about how the social dimension of the context is the transmitting medium between structural conditions for entrepreneurship and the decision to act upon identified entrepreneurial opportunities. Following this line of argument, this dissertation is built on the assumption that entrepreneurship is a social phenomenon which gives strong arguments for including local culture in entrepreneurship research.

    The temporal persistence and the pronounced differences of culture and structural conditions between places reflect path-dependent processes. I therefore use regional path dependence as an interpretative lens to study the contextualization of entrepreneurship in two Swedish cities.

    Although each context is unique, some generalizations can be drawn from the four individual papers in this dissertation. The first is that industrial legacy leads to the formation of a distinct local culture and that the persistency of this culture influences the subsequent entrepreneurial activities in new local industries. The second is that this persistency of culture suggests that entrepreneurs who are outsiders, geographically or socially, are the driving forces for the emergence of new local industries. Finally, new industry emergence is a result of a combination of exogenous forces and initial local conditions, but it is the entrepreneurial individuals who translate these forces and conditions into entrepreneurial activities.

  • Public defence: 2017-04-28 13:15 J1650, Karlskrona
    Hu, Yan
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Cloud Computing for Achieving Interoperability in Home-based Healthcare2017Doctoral thesis, comprehensive summary (Other academic)