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Previous issue date: 2011-03-25 / Spacecraft move with high speeds and suffer abrupt changes in acceleration. So, an
onboard GPS receiver could calculate navigation solutions if the Doppler effect is taken into
consideration during the satellite signals acquisition and tracking. Thus, for the receiver
subject to such dynamic cope these shifts in the frequency signal, resulting from this effect, it
is imperative to adjust its acquisition bandwidth and increase its tracking loop to a higher
order. This paper presents the changes in the GPS Orion s software, an open architecture
receiver produced by GEC Plessey Semiconductors, nowadays Zarlink, in order to make it
able to generate navigation fix for vehicle under high dynamics, especially Low Earth Orbit
satellites. GPS Architect development system, sold by the same company, supported the
modifications. Furthermore, it presents GPS Monitor Aerospace s characteristics, a
computational tool developed for monitoring navigation fix calculated by the GPS receiver,
through graphics. Although it was not possible to simulate the software modifications
implemented in the receiver in high dynamics, it was observed that the receiver worked in
stationary tests, verified also in the new interface. This work also presents the results of GPS
Receiver for Aerospace Applications experiment, achieved with the receiver s participation in
a suborbital mission, Operation Maracati 2, in December 2010, using a digital second order
carrier tracking loop. Despite an incident moments before the launch have hindered the
effective navigation of the receiver, it was observed that the experiment worked properly,
acquiring new satellites and tracking them during the VSB-30 rocket flight. / Ve?culos espaciais se movem com velocidades elevadas e sofrem mudan?as bruscas de
acelera??o. Ent?o, para que um receptor de GPS possa calcular solu??es de navega??o
estando a bordo de tais ve?culos, o efeito Doppler deve ser levado em considera??o durante os
processos de aquisi??o e rastreio de sinais de sat?lites. Assim, para que o receptor submetido ?
alta din?mica comporte os deslocamentos de frequ?ncia no sinal recebido, decorrentes desse
efeito, ? necess?rio ajustar sua largura de banda de varredura de frequ?ncias e aumentar a
ordem de sua malha de rastreio. Este trabalho apresenta as modifica??es no software no GPS
Orion, um receptor de arquitetura aberta da GEC Plessey Semiconductors, hoje Zarlink, a fim
de torn?-lo apto a gerar solu??es de navega??o em ve?culos submetidos ? alta din?mica,
especialmente sat?lites de ?rbita baixa. A plataforma de desenvolvimento GPS Architect,
comercializada pela mesma empresa, foi utilizada para dar suporte ?s modifica??es. Al?m
disso, s?o apresentadas as caracter?sticas do Monitor GPS Aeroespacial, uma ferramenta
computacional desenvolvida para monitorar as solu??es de navega??o calculadas pelo
receptor de GPS atrav?s de gr?ficos. Apesar de n?o ter sido poss?vel fazer simula??es em alta
din?mica com as modifica??es de software implementadas no receptor, verificou-se seu
funcionamento satisfat?rio, em regime estacion?rio, fazendo uso, inclusive, da nova interface
gr?fica. A disserta??o apresenta ainda os resultados do experimento Receptor de GPS para
Aplica??es Aeroespaciais, obtidos com a participa??o do receptor numa miss?o suborbital, a
Opera??o Maracati 2, em dezembro de 2010, utilizando uma malha de rastreio de portadora
digital de segunda ordem. Apesar de um incidente ocorrido momentos antes do lan?amento
ter prejudicado a navega??o efetiva do receptor, foi observado que o experimento funcionou
adequadamente, rastreando e adquirindo novos sat?lites durante o voo do foguete VSB-30.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15403 |
| Date | 25 March 2011 |
| Creators | Raposo, Tullio Emmanuel Messias |
| Contributors | CPF:39276066420, http://lattes.cnpq.br/1640808531484356, Borba, Gilvan Luiz, CPF:10849572487, http://lattes.cnpq.br/0043059721601657, Sarcinelli Filho, M?rio, CPF:47138386753, Mota, Francisco das Chagas |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Engenharia El?trica, UFRN, BR, Automa??o e Sistemas; Engenharia de Computa??o; Telecomunica??es |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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