Thesis (Ph.D.)--University of California, Berkeley, 2009. / Text document (PDF). Title from PDF title page (viewed on April 2, 2010). "Fall 2009." Includes bibliographical references (p. 41-42).

Made available in DSpace on 2014-06-11T19:24:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-04-07Bitstream added on 2014-06-13T20:12:58Z : No. of bitstreams: 1 tragueta_nl_me_botfca.pdf: 596662 bytes, checksum: f79930749f3e9ad077ff75e918264150 (MD5) / O Sistema de Posicionamento Global (GPS – Global Positioning System) permite o conhecimento da posição, via satélite, de localidades específicas como um ponto topográfico, um carro em movimento ou de uma pessoa caminhando. A precisão do posicionamento pode variar, já que ela está diretamente relacionada ao tipo de receptor utilizado e aos objetivos em questão. Os receptores de navegação, por apresentarem menos precisão, são normalmente utilizados na obtenção de dados aproximados, que não exigem a mesma acurácia dos receptores topográficos ou geodésicos. No entanto, diante da existência de diferentes elipsóides para diferentes regiões do globo terrestre, admitiu-se a hipótese de que a configuração de um elipsóide inadequado para nossas condições poderia provocar erros ainda maiores na determinação de um posicionamento. Neste contexto, foi desenvolvido o presente trabalho, tendo como principais objetivos avaliar, comparar e analisar o desempenho de seis receptores GPS de navegação idênticos com respeito ao cálculo de áreas, perímetros e afastamentos horizontais. Em função dos resultados obtidos, nas condições em que o trabalho foi conduzido, conclui-se que a utilização de receptor GPS de navegação sem conhecimento de suas limitações e configurações básicas, pode levar o usuário a considerar direções e distâncias incompatíveis com o trajeto pretendido ou demarcado. O usuário comum deve saber, no mínimo, que elipsóide está considerando. Quando comparados com o posicionamento real da área (receptor geodésico configurado para SAD 69), a utilização de receptor de navegação configurado para os elipsóides SAD 69, WGS 84 e Córrego Alegre apresentam deslocamento da área no sentido médio de 224º54’43”, 225º10’51” e 206º04’24”, respectivamente, com distância média de 67,49 m; 129,67 m e 90,57 m, respectivamente... / The Global Positioning System allows the knowledge of the position, through satellite, of specific places as a topographical point, a car in movement or of a person walking. The precision of the positioning may vary, because it is directly related to the type of used receiver and to the objectives in subject. The navigation receivers, for present less precision, are usually used in the obtaining of approximate data, that don't demand accuracy compared to the topographical or geodesic receivers. However, in function of the existence of different ellipsoids for different regions of the earth, the hypothesis admitted was that the configuration of an inadequate ellipsoid for our conditions could still provoke big mistakes in the determination of a positioning. In this context, the present work was developed, having as main objectives to evaluate, to compare and to analyze the performance of six identical navigation GPS receivers with regard to the calculation of areas, perimeters and horizontal removals. In function of the obtained results, in the conditions in that the work was developed, it is ended that the use of navigation GPS receivers without knowledge of its limitations and basic configurations, it can take the user to consider directions and incompatible distances with the intended itinerary or demarcated. The common user should know, at least, what ellipsoid is considering. When compared with the real positioning of the area (geodesic receiver configured for SAD 69), the use of navigation receiver configured for the ellipsoids SAD 69, WGS 84 and Córrego Alegre present displacement of the area on the average sense of 224º54'43, 225º10'51 and 206º04'24, respectively, with on the average distance of 67,49 m; 129,67 m and 90,57 m, respectively. The area and perimeters values obtained by navigation GPS receivers, when compared to the area and perimeter obtained by geodesic...(Complete abstract, click electronic access below)

Orientador: Lincoln Gering Cardoso / Banca: Zacarias Xavier de Barros / Banca: Vilmar Antonio Rodrigues / Resumo: O Sistema de Posicionamento Global (GPS - Global Positioning System) permite o conhecimento da posição, via satélite, de localidades específicas como um ponto topográfico, um carro em movimento ou de uma pessoa caminhando. A precisão do posicionamento pode variar, já que ela está diretamente relacionada ao tipo de receptor utilizado e aos objetivos em questão. Os receptores de navegação, por apresentarem menos precisão, são normalmente utilizados na obtenção de dados aproximados, que não exigem a mesma acurácia dos receptores topográficos ou geodésicos. No entanto, diante da existência de diferentes elipsóides para diferentes regiões do globo terrestre, admitiu-se a hipótese de que a configuração de um elipsóide inadequado para nossas condições poderia provocar erros ainda maiores na determinação de um posicionamento. Neste contexto, foi desenvolvido o presente trabalho, tendo como principais objetivos avaliar, comparar e analisar o desempenho de seis receptores GPS de navegação idênticos com respeito ao cálculo de áreas, perímetros e afastamentos horizontais. Em função dos resultados obtidos, nas condições em que o trabalho foi conduzido, conclui-se que a utilização de receptor GPS de navegação sem conhecimento de suas limitações e configurações básicas, pode levar o usuário a considerar direções e distâncias incompatíveis com o trajeto pretendido ou demarcado. O usuário comum deve saber, no mínimo, que elipsóide está considerando. Quando comparados com o posicionamento real da área (receptor geodésico configurado para SAD 69), a utilização de receptor de navegação configurado para os elipsóides SAD 69, WGS 84 e Córrego Alegre apresentam deslocamento da área no sentido médio de 224º54'43", 225º10'51" e 206º04'24", respectivamente, com distância média de 67,49 m; 129,67 m e 90,57 m, respectivamente...(Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The Global Positioning System allows the knowledge of the position, through satellite, of specific places as a topographical point, a car in movement or of a person walking. The precision of the positioning may vary, because it is directly related to the type of used receiver and to the objectives in subject. The navigation receivers, for present less precision, are usually used in the obtaining of approximate data, that don't demand accuracy compared to the topographical or geodesic receivers. However, in function of the existence of different ellipsoids for different regions of the earth, the hypothesis admitted was that the configuration of an inadequate ellipsoid for our conditions could still provoke big mistakes in the determination of a positioning. In this context, the present work was developed, having as main objectives to evaluate, to compare and to analyze the performance of six identical navigation GPS receivers with regard to the calculation of areas, perimeters and horizontal removals. In function of the obtained results, in the conditions in that the work was developed, it is ended that the use of navigation GPS receivers without knowledge of its limitations and basic configurations, it can take the user to consider directions and incompatible distances with the intended itinerary or demarcated. The common user should know, at least, what ellipsoid is considering. When compared with the real positioning of the area (geodesic receiver configured for SAD 69), the use of navigation receiver configured for the ellipsoids SAD 69, WGS 84 and Córrego Alegre present displacement of the area on the average sense of 224º54'43", 225º10'51" and 206º04'24", respectively, with on the average distance of 67,49 m; 129,67 m and 90,57 m, respectively. The area and perimeters values obtained by navigation GPS receivers, when compared to the area and perimeter obtained by geodesic...(Complete abstract, click electronic access below) / Mestre

No description available.

The University of Canberra (UC) has been involved in GPS processing since the late 1980s. This processing commenced with the GOTEX 1988 campaign and progressed through a series of project specific regional campaigns to the current daily processing of a distributed set of continuously operating sites for the determination of precise GPS station positions for user applications. Most of these earlier campaigns covered only short periods of time, ranging from a few weeks to multiple occupations of a few days to a time over one to two years. With software developments, these multiple occupations were able to be combined to produce results from which crustal motion velocities could be extracted. This first became feasible with the processing of the Australian National Network (ANN), which yielded realistic tectonic velocities from two occupations (1992 and 1993) of sites 12 months apart. Subsequently, this was successfully extended by a further 12 months, with re-occupation of certain sites for a third time in 1994. Analysis of the results indicated that the accuracy of determining the earth signals improved as the time span from first to last observation was increased. The same was true also for the determination of the position of global references sites. However, by current standards the results achieved were poor. Consequently, the process was extended to combine the results of subsequent campaigns with the original ANN data set. From 1995 to 1999, campaigns were conducted across Australia, covering many State and tide gauge sites included in the original ANN solution. These provided additional multiple occupations to improve the determinations for both position and velocity. UC has maintained a data set of the global IGS sites, commencing with the IGS pilot campaign of 1992. Daily data sets for those global sites, which contained days common to the regional campaigns, were processed to produce our own independent global orbit and reference frame connection. The motivation for doing so was fourfold. �Firstly, to see if historic data could be reprocessed using current modern software and thus be able to be incorporated in this and other analysts research programs. �Secondly, to compare the results of the reprocessing of the original data set using modern software with the original ANN solution and then validate both the solutions. �Thirdly, to extend the timespan of observations processed to include more recent campaigns on as many original sites as possible. This to achieve a stronger solution upon which to base the determination of an Australian tectonic plate velocity model and provide quality assurance on the solution comparisons with re-observed sites. �Fourthly, to develop a set of transformation parameters between current coordinate systems and the GDA94 system so as to be able to incorporate new results into the previous system. The final selection of regional and global sessions, spanning from mid 1992 to late 2002, contained almost 1000 individual daily solutions. From this 10 year data span a well determined rigid plate tectonic motion model was produced for Australia. This site velocity model was needed to develop a transformation between the thesis solution in ITRF00 an the GDA94 solution in ITRF92. The significant advantage of the plate velocity model is that all Australian sites can now have computed a realistic velocity, rather than being given a value which has been interpolated between sites whose velocities had been determined over a one or two year span. This plate velocity model is compared with the current tectonic motion NNR-NUVEL-1A model and other recently published models. To perform the comparison between the thesis solution in ITRF00 and the GDA solution in ITRF92 a transformation was developed between the two reference systems. This set of transformation parameters, in conjunction with the plate velocity model developed, enables site solutions at any epoch in the current ITRF00 to be converted onto the GDA94, and vice versa, with a simple, non-varying seven parameter transformation. The comparisons between the solutions are analysed for both horizontal position and height consistency. There were 77 sites whose differences were compared. The horizontal consistency was within estimated precisions for 75 of the 77 sites. However, the vertical comparisons revealed many of the single epoch sites, especially in 1992, have inconsistent results between the two solutions. The heights from this thesis for some West Australian sites were compared with analysis done by DOLA and the height recoveries are very similar, indicating a weakness in the GDA94 solution for some of the single epoch sites. Some of these differences have been resolved but others are still under investigation. This thesis describes the repocessing of the original ANN data set, the addition of later data sets, the results obtained, and the validation comparisons of the old and new solutions. As well as the plate velocity model, transformation is provided which enables the user to compute between the GDA94 system, and any epoch result in ITRF00. Recommendations are made as to which sites need additional work. This includes sites which only need further analysis or investigation and those which require further observations to achieve a result which will have acceptable accuracy and reliability.

Master's thesis - - State University of New York College at Cortland, 2009 - - Department of Kinesiology. / Includes bibliographical references (p. 25-7).

The purpose of this application is to serve the end user of an Android Smart phone, with reliable, instantaneous and location based information on places of interest such as restaurants, gas stations, hotels, movie theaters, and the like by using the phones' built-in GPS. The basic information includes viewing the map and address of the place of interest and getting the directions to a particular place in addition to having some extra features. Contains computer source code.