%0 Journal Article
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%X We describe the attitude control system employed by the MASCO balloon-borne gamma ray telescope and present the first laboratory tests of this system. The MASCO experiment is a low energy gamma ray imaging telescope that employs a MURA coded mask. Its angular resolution is 14' over a 13 degrees field of view, which requires a pointing accuracy of some arcminutes in order to allow the accomplishment of the scientific goals. The attitude control system was designed to provide pointing and stabilization of a 1400 kg, 7 m-high, 2 m-wide, 2 m-deep gondola that encompasses the telescope detector system and its associated electronics. The sensors used are an electronic magnetic compass, an encoder, a two-axis solar sensor, a sun-tracker, two accelerometers, a gyroscope and three CCD stellar sensors. A GPS system is also employed. The actuators are a reaction wheel for azimuth control, an azimuth motor located in the balloon-gondola decoupling mechanism for desaturation of the reaction wheel, and a telescope elevation motor with a harmonic drive reduction. The software architecture and the operation modes are also presented.
%N 9
%@secondarydate 20011105
%T Development of an attitude control system for a ballon-borne gamma ray telescope
%K ASTROFÍSICA, sistemas de controle de atitude, telescópio de raios gama, arquitetura (computadores), programa de computador, attitude control, gamma ray telescopes, architeture (computers), computer programs.
%@secondarytype PRE PI
%@archivingpolicy denypublisher denyfinaldraft24
%@usergroup administrator
%@usergroup jefferson
%@group DAS-INPE-MCT-BR
%@group DMC-INPE-MCT-BR
%@group
%@group
%@group
%@group DAS-INPE-MCT-BR
%@group DAS-INPE-MCT-BR
%@secondarykey INPE-8449-PRE/4217
%F 9428
%@issn 0273-1177
%2 sid.inpe.br/iris@1905/2005/08.04.11.39
%B Advances in Space Research
%@versiontype publisher
%P 1415-1418
%4 sid.inpe.br/iris@1905/2005/08.04.11.38
%@documentstage not transferred
%D 2000
%V 26
%A Villela Neto, Thyrso,
%A Fonseca, R. A.,
%A Souza, P. de,
%A Alves, A.,
%A Mejía Cabeza, Jorge,
%A Correa, Ricardo Varela,
%A Braga, João,
%@dissemination WEBSCI; PORTALCAPES; MGA; COMPENDEX.
%@area ETES