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 10 of 10 for “"Ground track"”.
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Cooperative Control of Miniature Air Vehicles
… fields was developed. A vector field of desired ground track headings is calculated and commanded ground track headings are calculated such that ground track heading error and lateral following error decay asymptotically even in the presence of constant wind disturbances. The utilization of …
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Expanded tradespace analysis and operational considerations for reconfigurable satellite constellations
… locations. ReCon leverages the natural shift of ground tracks due to the disparity between the Earth's rotation and the period of an orbit to maneuver a constellation into repeating ground track (RGT) orbits. This maneuvering strategy relies on altitude changes to vary an orbit's ascending node …
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Investigation of the effect of repeat orbits on GRACE gravity recovery
… change such that the satellites enter a repeat ground track configuration. Repeat ground tracks result in reduced spatial resolution of the satellites, which poses problems in the context of gravity recovery. The monthly gravity solutions during these periods are examined and shown to have lower …
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Application of optimization techniques to the design and maintenance of satellite constellations
… methods were used to design a 113:14 repeat ground track variant of the Ellipso TM inclined elliptical sub-constellation and a gear array variant of the Ellipso TM equatorial sub-constellation. The resulting optimal constellation designs were found to maintain stability, even when subjected …
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The identification and tracking of Agulhas rings using satellite altimetry
… 1989 with application to the identification and tracking of Agulhas rings in the southeast Atlantic Ocean. A population of as many circulation features of as five anticyclonic (and cyclonic) annular form consistent with that reported for Agulhas rings was identified from the altimeter data. The …
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Design and development of an airborne microwave radiometer for atmospheric sensing
… by underflying the satellite along the same ground track and collecting correlated data. NAST-K has fullwidth at half maximum beamwidths of 7.4° and 6.8° for the two channels respectively, which is approximately consistent with NAST-M. The effective spot size of NAST-K is 2.3km in diameter …
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The New Concept of GRACE Gradiometry and the Unravelling of the Mystery of Stripes
… where fs is the sampling frequency of the GRACE ground track bundles along the parallels, and m and n are mutually prime integers, with 2mn. GRACE effective latitudinal sampling frequency is shown to be s=1.14 degrees. We generate synthetic stripes using moir theory and by means of rigorous …
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Statistical modeling of aircraft engine fuel burn
… and aviation emissions. While the trajectory (ground track) of a flight can be observed using surveillance systems, its fuel consumption is generally not disseminated by the operating airline. Emissions inventories and benefits assessment tools therefore need models that can predict the fuel …
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Preliminary Design of a Titan-Orbiting Stellar Occultation Mission
… at mid-latitudes normal to the satellite ground track which may inhibit the diagnosis of the angular momentum flux associated with thermal tides. If necessary, a second satellite in an orbit orthogonal to the first is suggested to close coverage gaps to provide full local time coverage …
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Dynamics of the Antarctic circumpolar current : evidence for topographic effects from altimeter data and numerical model output
… mean sea surface height for each satellite ground track using a meandering Gaussian jet model, and errors have been estimated using Monte Carlo simulation. The results are objectively mapped to produce a picture of the mean Subantarctic and Polar Fronts, which together comprise the major …