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 68 for “"altimeter"”.
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Environmental Signals in Satellite Altimeter Data
… a connection between satellite radar altimeter data and and environmental activity over land surfaces. Variations in height and sigma0 data sets are both considered with the first stages being investigations into the reliability of the altimeter data over land. The accuracy of the …
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Airborne radar altimeter return waveform computations
Radar altimeter experiments have shown the need for expanding the downward-looking, single-beam system into a multiple beam radar altimeter employing off-nadir altimetry so that information from a wider swath can be obtained from a single overflight. Problems associated with off-nadir altimetry …
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Collinear analysis of altimeter data in the Bering Sea
… of sea surface height data from the GEOSAT altimeter along collinear subtracks were analyzed for information on the circulation pattern in the Bering Sea. Seventy subtracks from both ascending and descending orbits, with as many as 35 repeat cycles along each subtrack, were analyzed. Orbit …
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Collinear analysis of altimeter data in the Bering Sea
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1989.
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The design of a radio altimeter using frequency modulation method
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1937 [second author], and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautical Engineering, 1937 [first author].
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An altimeter waveform model for combined surface and volume scattering
Radar altimeters were originally designed to study ocean geodynamics, where the scattering processes are governed entirely by the surface features. These same altimeters have recorded data from over the polar ice sheets, where the scattering processes cannot in general be limited to surface …
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Investigation of regional variation in Lunar crater morphometry from (Lunar Orbiter Laser Altimeter) LOLA observations
… surface, obtained from the Lunar Orbiter Laser Altimeter (LOLA), has allowed for a quantitative assessment of crater morphometry. 351 simple and complex craters in the Mare Serenitatis, far side highlands, near side highlands, and South Pole-Aitken basin are decomposed into 50 elevation …
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Development of a Small Sonar Altimeter and Constant Altitude Controller for a Miniature Autonomous Underwater Vehicle
… and development of a small, inexpensive sonar altimeter. Piezoelectric material is used for transduction in the sonar system while a PIC microcontroller processes the return signals from the water. This altimeter was made to be implemented on a miniature autonomous underwater vehicle developed …
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Dynamics of the Antarctic circumpolar current : evidence for topographic effects from altimeter data and numerical model output
Geosat altimeter data and numerical model output are used to examine the circulation and dynamics of the Antarctic Circumpolar Current (ACC). The mean sea surface height across the ACC has been reconstructed from height variability measured by the Geosat altimeter, without assuming prior knowledge …
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Assimilation of altimeter data in a quasi-geostrophic model of the Gulf Stream system : a dynamical perspective
… aspects involved in the assimilation of altimeter data in a numerical ocean model have been investigated. The model used for this study is a quasi-geostrophic model of the Gulf Stream region. The data that have been assimilated are maps of sea surface height which have been obtained as …
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Assimilation of altimeter data in a quasi-geostrophic model of the gulf stream system : a dynamical perspective
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1993.
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Dynamics of the Antarctic circumpolar current : evidence for topographic effects from altimeter data and numerical model output
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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The identification and tracking of Agulhas rings using satellite altimetry
… surf ace geostrophic currents from GEOSAT altimeter data are explained. These methods were implemented in an examination of GEOSAT altimeter data for the period 12 July 1988 to 13 May 1989 with application to the identification and tracking of Agulhas rings in the southeast Atlantic Ocean. …
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Land based applications of multi-mission Satellite Radar Altimetry
The success of the Radar Altimeter in determining sea surface heights over the open ocean is well known, with heights accurate to <5cm (Chelton et al., 2001); however land based applications are under developed. This is due to the complexity of the waveforms returned from land surfaces; retracking …
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Radar Altimetric Studies of Polar Ice
… in the Arctic by a Ku-band microwave radar altimeter, designed and constructed in the UK, are analysed. The two main components of this study comprise data gathered in the East Greenland Sea marginal ice zone and over two Svalbard ice caps. A systematic treatment is made of the …
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On the role of high frequency waves in ocean altimetry
… stress, and sea level using a microwave radar altimeter. The data were collected from a low-flying aircraft using a sensor suite designed to measure the surface waves, radar backscatter, the atmospheric flow, and turbulent fluxes within the marine boundary layer. This uncommon ensemble provides …
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Establishment of a Cyber-Physical Systems (CPS) Test Bed to Explore Traffic Collision Avoidance System (TCAS) Vulnerabilities to Cyber Attacks
… with micro-controllers. These include Radar Altimeter, Barometric Altimeter, and Air Data Computer (ADC) heading and attitude information transmitted by Aeronautical Radio INC (ARINC) 429 encoding protocol. TCAS spoofing is attempted against the test bed and analysis conducted on the timing …
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Pilot Performance and Eye Movement Activity with Varying Levels of Display Integration in a Synthetic Vision Cockpit
… the glideslope indicator, the localizer, and the altimeter as a function of display integration level or display view. There were more fixations on the airspeed indicator with the more integrated display layout and during high workload trials. There were also more fixations on the glideslope …
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Incoherent short pulse scattering from penetrable geophysical media
… GHz Advanced Aircraft Flight Experiment (AAFE) altimeter and NASA's 36 GHz Multimode Aircraft Radar Altimeter (MARA). These altimeters operated simultaneously from the same P-3 aircraft platform in September of 1991 and thus provide a dual frequency look at the scattering properties of the ice …
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Characterization of crater morphometry on the Moon and Mercury from altimetry observations
Recently acquired altimetry data from laser altimeters are used to assess the morphometry of impact craters. Data acquired by the Mercury Laser Altimeter on the MESSENGER spacecraft are used to measure the depths and diameters of 537 craters at the high northern latitudes on Mercury, including 42 …
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