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- Frisk, U., et al.
(författare)
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The Odin satellite - I. Radiometer design and test
- 2003
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Ingår i: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 402:3, s. L27-L34
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Tidskriftsartikel (refereegranskat)abstract
- The Sub-millimetre and Millimetre Radiometer (SMR) is the main instrument on the Swedish, Canadian, Finnish and French spacecraft Odin. It consists of a 1.1 metre diameter telescope with four tuneable heterodyne receivers covering the ranges 486-504 GHz and 541-581 GHz, and one fixed at 118.75 GHz together with backends that provide spectral resolution from 150 kHz to 1 MHz. This Letter describes the Odin radiometer, its operation and performance with the data processing and calibration described in Paper II.
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- Papadimitratos, Panagiotis, et al.
(författare)
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Path Set Selection in Mobile Ad Hoc Networks
- 2002
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Ingår i: Proceedings of the Third ACM International Symposium on Mobile Ad Hoc Networking and Computing (MobiHoc). ; , s. 1-11
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Konferensbidrag (refereegranskat)abstract
- Topological changes in mobile ad hoc networks frequently render routing paths unusable. Such recurrent path failures have detrimental effects on the network ability to support QoS-driven services. A promising technique for addressing this problem is to use multiple redundant paths between the source and the destination. However, while multipath routing algorithms can tolerate network failures well, their failure resilience only holds if the paths are selected judiciously. In particular, the correlation between the failures of the paths in a redundant path set should be as small as possible. However, selecting an optimal path set is an NP-complete problem. Heuristic solutions proposed in the literature are either too complex to be performed in real-time, or too ineffective, or both. This paper proposes a multipath routing algorithm, called Disjoint Pathset Selection Protocol (DPSP), based on a novel heuristic that, in nearly linear time on average, picks a set of highly reliable paths. The convergence to a highly reliable path set is very fast, and the protocol provides flexibility in path selection and routing algorithm. Furthermore, DPSP is suitable for real-time execution, with nearly no message exchange overhead and with minimal additional storage requirements. This paper presents evidence that multipath routing can mask a substantial number of failures in the network compared to single path routing protocols, and that the selection of paths according to DPSP can be beneficial for mobile ad hoc networks, since it dramatically reduces the rate of route discoveries.
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