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- Boettcher, M. A., et al.
(författare)
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In-orbit measurement of S-band radio noise during the Flying Laptop satellite mission
- 2021
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Ingår i: Proceedings of the International Astronautical Congress, IAC. - : International Astronautical Federation, IAF.
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Konferensbidrag (refereegranskat)abstract
- The "Flying Laptop"small satellite was developed as a technology demonstration platform and is operated by the University of Stuttgart's Institute of Space Systems (Germany) and was launched on July 14th 2017 into a 600 km Sun synchronous Low Earth Orbit (LEO). For data exchange with ground stations, the satellite is equipped with the S-band transceivers of type SSTRX-1100. The receiver operates at a centre frequency of 2083.5 MHz and additionally provides various information about the received signals. A power indicator value is used to determine the incoming radio power on this frequency. Whereas this information normally is disregarded if the satellite is not communicating with a ground station, for this analysis, the power indication value has been used to derive the background noise temperature within 100 kHz bandwidth. For the period between February 2018 and January 2021, the incoming signal power was recorded every 20 s and later extended by the corresponding satellite position, based on on-board GPS measurements. Although the exact direction of the incoming signal cannot be determined due to the quasiomnidirectional antenna design, a statistical analysis has been performed for the large amount of measurement points for a 1° Longitude/Latitude grid. Finally, the background noise temperature is derived. Several maps show interferences and background noise, and variations over time. The presented results provide an important insight on the radio environment for a commonly used frequency for Earth-observation LEO satellites.
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- Öberg, Christina, et al.
(författare)
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Changing network pictures : Evidence from mergers and acquisitions
- 2007
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Ingår i: Industrial Marketing Management. - : Elsevier BV. - 0019-8501 .- 1873-2062. ; 36:7 SPEC. ISS., s. 926-940
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Tidskriftsartikel (refereegranskat)abstract
- A merger or acquisition may cause dramatic changes in a business network, which in turn affect managerial cognition as well as managerial activities. We use the concepts of 'network pictures' and 'networking' to illustrate and analyse changes in managerial sense-making and networking activities following a merger or acquisition. The paper focuses on acquiring, acquired or merging parties and those companies with which they have direct customer relationships. Based on three case studies comprising seven acquisitions and one merger, we show that following a merger or acquisition managers may need to adapt their previous network pictures in a radical way, these adaptations are, however, not always realized as shifts in network pictures and adjustments in networking activities by all the managers involved. Whereas the merging parties' network pictures and networking activities are largely driven by their perception of customers' needs and developments, it is not certain that the merger or acquisition is enacted accordingly. The paper contributes to a clearer view on the conceptual interdependence of the constructs of network pictures and networking in multi-actor situations and thus it develops a network perspective on mergers and acquisitions. © 2007 Elsevier Inc. All rights reserved.
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