Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 164 for “"geomagnetic"”.
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Geomagnetic Aided Dead-Reckoning Navigation
… an integrated navigation architecture based on geomagnetic referencing models capable of dead reckoning at GPS denied intervals. A geomagnetic matching algorithm combined with a nearest contour point of the magnetic surface is studied. Combined with an Extended Kalman filter as Inertial …
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Wavelet analysis of geomagnetic jerks
Geomagnetic jerks, or secular variation impulses, are abrupt changes in the slope of the first time derivative of the Earth's magnetic field. These changes occur on time scales of the order of a year. It has been demonstrated that the jerks might be more singular than previously supposed; their …
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Artificial Intelligence-Assisted Inertial Geomagnetic Passive Navigation
… Rao-Blackwellized Particle Filter for enhancing geomagnetic navigation in airborne simulated missions.</p> <p>A simulation framework is developed to facilitate the evaluation of the proposed navigation system. This framework includes a detailed aircraft model, a mathematical representation of the …
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Geomagnetic Compensation for Low-Cost Crash Avoidance Project
… is to be low-cost, the proposed solution for geomagnetic compensation will only use a single magnetic sensor and a consumer-grade GPS. Other solutions exist for geomagnetic compensation but use extra sensors and can become costly.</p> <p>In order to progress the development of this project …
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Automatic prediction of solar flares and super geomagnetic storms
… on space system, satellite-based services. A geomagnetic storm, a disturbance in Earth's magnetosphere, may produce many harmful effects on Earth. Solar flares and Coronal Mass Ejections (CMEs) are believed to be the major causes of geomagnetic storms. Thus, establishing a real time …
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Assessing Holocene and late Pleistocene geomagnetic dipole field variability
… artefacts are required to reconstruct geomagnetic field changes beyond the range of historical observations. In this thesis I assess the reliability of sedimentary palaeomagnetic data and Holocene dipole field reconstructions. New palaeomagnetic records are presented from a maar crater …
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Operational modelling of geomagnetic fields and geomagnetically induced currents
Geomagnetically induced currents (GICs) have long been known to affect power systems adversely. Modelling these GICs usually involves consideration of a chain of coupled systems. The scope of the modelling chain spans multiple disciplines, from solar physics through to geophysics and power …
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Geomagnetic attitude control of satellites using generalized multiple scales
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Geomagnetic Impulses and the Electrical Conductivity of the Lower Mantle
… to decades. In particular the phenomena of geomagnetic "impulses" or "jerks" are investigated. Vigorous discussion has surrounded these phenomena since they were first suggested to have been of global scale, of short duration and originating within the core (Courtillot et a/, 1978), …
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An analysis of IQSY meteor wind and geomagnetic field data,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1970.
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Geomagnetic induction and the electrical conductivity of the earth's mantle
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1961.
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A geomagnetic survey of parts of Pierce, Benson, Sheridan and Wells counties
<p>A magnetometer survey in respect to oil exploration is a regional reconnaissance tool and, therefore, it is customary to check an interesting magnetic anomaly with a seismograph or gravimeter. An exception to this is found in micro magnetic surveys which, because of their detailed nature 28 …
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A geomagnetic survey of Pembina, Grand Forks, and eastern Walsh counties, North Dakota
<p>From August, 1977, to March, 1978, total field geomagnetic readings were taken at 948 sites in the following counties in North Dakota: Pembina County, Grand Forks County, and Walsh County east of 98°W. longitude. The field data was contoured by computer using the SYMAP commercial computer …
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Geomagnetic variations in the Northwest Atlantic : implications for the electrical resistivity of the oceanic lithosphere
A geomagnetic variation study on mature oceanic lithosphere in the North Atlantic just south of Bermuda has revealed the presence of at least one layer of low electrical resistivity. The low resistivity layer of approximately 10 ohm-m has been found at three widely spaced seafloor sites with …
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The design of an instrument to measure vertically averaged oceanic currents using geomagnetic electric fields
A bottom mounted electromagnetic current meter measures the vertically-averaged conductivity-weighted velocity. This measurement complements free-fall relative velocity profiles and is valuable for transport determination and dynamics studies. Such an instrument has been designed to measure the …
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An investigation of the roles of geomagnetic and acoustic cues in whale navigation and orientation
… This thesis takes a first look at the roles of geomagnetic and acoustic cues in humpback whale navigation and orientation, in addition to documenting some effects of human-produced sound on beaked whales. The tracks of satellite-tagged humpback whales migrating from Hawaii to Alaska were found …
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