Gps Receiver
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Co-Design of a GPS Antenna Low-Noise Amplifier Front-End Circuit
Abstract This paper presents a clear and fast design procedure for directly matched low noise active integrated microstrip antenna front end circuits. Initially, a theoretical analysis is given for the overall gain equivalence between traditional and directly matched antennas. Then, a detailed procedure is presented for the design and construction of a fully
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 11/11/2019
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2. KLOBUCHAR AND NEQUICK G IONOSPHERIC MODELS COMPARISON FOR MULTI-GNSS SINGLE-FREQUENCY CODE POINT POSITIONING IN THE BRAZILIAN REGION
Abstract One of the main error sources in GNSS positioning comes from the ionosphere, an atmospheric layer that stays in the signal path between the satellite and the receiver. For single frequency positioning, the ionospheric effects can be minimized by using an ionospheric model e.g. Klobuchar or NeQuick G. These models are respectively associated to GPS a
Bol. Ciênc. Geod.. Publicado em: 14/10/2019
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3. GPS-Dependent Systems: Vulnerabilities to Electromagnetic Attacks
ABSTRACT The GPS is a satellite navigation system that provides location and time information. Such a system currently supports critical applications for military, civil and commercial users worldwide and is accessible to any operator by using a single GPS receiver. However, although being too dependent on GPS signals, just a few of these applications presen
J. Aerosp. Technol. Manag.. Publicado em: 2016-12
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4. Humans tend to walk in circles as directed by memorized visual locations at large distances
Human veering while walking blindfolded or walking straight without any visual cues has been widely studied over the last 100 years, but the results are still controversial. The present study attempted to describe and understand the human ability to maintain the direction of a trajectory while walking without visual or audio cues with reference to a proposed
Psychol. Neurosci.. Publicado em: 2014-12
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5. AVALIAÇÃO DA EFICIÊNCIA OPERACIONAL NA OPERAÇÃO DE COLHEITA MECANIZADA EM LAVOURAS DE ARROZ IRRIGADO / EVALUATION OF OPERATING EFFICIENCIES IN HARVESTING RICE FIELDS
The objective of this thesis was evaluate the efficiencies of the harvesting operation in rice fields, located in the region of Depressão Central do Rio Grande do Sul. As specific objectives, this study sought to determine and evaluate the following efficiencies: field, time, field pattern and cutter bar; to verify if there is difference between the areas w
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/03/2011
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6. Mapeamento de unidades experimentais com GPS: caso de estudo da Embrapa Cerrados.
ABSTRACT: The major objective of this work was to map the research units and the infrastructure available in the Embrapa Cerrados experimental farm in Planaltina, Federal District. More than 190 identities were observed and mapped through the use of GPS portable receiver with an accuracy of about five meters. The UTM coordinates obtained by the GPS were stor
Planaltina. Publicado em: 2011
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7. Mapeamento da distribuição espacial de plantas daninhas na cultura da soja por meio de sensoriamento remoto.
RESUMO: Não existe, atualmente, maneira prática e rápida de geração de mapas de distribuição espacial de plantas daninhas para aplicação localizada de herbicida, e o emprego de fotografias aéreas não convencionais com esse fim tem sido discutido. O objetivo deste trabalho foi avaliar o uso de fotografias aéreas não convencionais para mapear a di
Planaltina. Publicado em: 2011
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8. Performance evaluation of GPS receiver under equatorial scintillation
Abstract: Equatorial scintillation is a phenomenon that occurs daily in the equatorial region after the sunset and affects radio signals that propagate through the ionosphere. Depending on the temporal and spatial situation, equatorial scintillation can represent a problem in the availability and precision of the Global Positioning System (GPS). This work is
J. Aerosp. Technol. Manag.. Publicado em: 2009-12
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9. Mecanização de central de navegação inercial com dados a partir da integração de IMU MEMS e receptor GPS / Inertial navigation mechanization through the intergration of an IMU MEMS and a GPS receiver.
The proposal of this work is to present a procedure for integration of the acceleration and angular rate measurements of a low cost Inertial Measurement Unit (IMU) based on MEMS (Micro Electro-Mechanical System) technology with position and speed data from a GPS receiver. Then, it details the equations that have been used to integrate the movement and the at
Publicado em: 2009
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10. Construção e validação de um receptor GPS para uso espacial
O Sistema de Posicionamento Global, conhecido mundialmente pala sigla GPS, é um sistema de radionavegação construído pelos norte-americanos com intenções militares, mas que encontraram, com o passar do tempo, muitas aplicações de uso civil. No Brasil, além do desenvolvimento de foguetes de sondagem, começam a aparecer projetos de construção de mi
Publicado em: 2009
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11. COMPARAÇÃO DE PROCEDIMENTOS PARA A INTEGRAÇÃO DE LEVANTAMENTOS TOPOGRÁFICOS E LEVANTAMENTOS COM GPS / COMPARISON OF PROCEDURES FOR THE INTEGRATION OF TOPOGRAPHICAL SURVEYS AND GPS SURVEYS
The georeferencing consists of the description of the rural property, characteristics and confrontations, of descriptive memorial containing the border coordinates, georeferenced to the Brazilian Geodetic System following the positioning precision defined by INCRA. The perimeter survey of a rural property can be done only using GPS receivers, or only with to
Publicado em: 2009
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12. Determinação de órbita e manobras utilizando GPS e motor com baixo empuxo / Orbit determination and autonomous maneuver using GPS and low thrust
The Global Positioning System (GPS) is a satellite navigation system that allows the users to determine 3D positioning and the time with high precision. Its main purposes are: aid to radionavigation in three dimensions with high precision positioning, navigation in real time, global coverage and quick acquisition of data sent by the GPS satellites. In this w
Publicado em: 2008