@InProceedings{ChagasLope:2014:SeAnAt,
               author = "Chagas, Ronan Arraes Jardim and Lopes, Roberto Vieira da Fonseca",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Seasonal Analysis of Attitude Estimation Accuracy for the 
                         Brazilian Satellite Amazonia-1 under Normal and Faulty 
                         Conditions",
            booktitle = "Proceedings...",
                 year = "2014",
         organization = "International Symposium on Space Fligth Dynamics.",
             keywords = "Attitude estimation, Star tracker, Fiber Optic Gyro, Kalman 
                         filter, MMP.",
             abstract = "The satellite Amazonia-1, which uses the Brazilian Multi-Mission 
                         Platform, has two star trackers and a four-axis fiber optic gyro 
                         to estimate the attitude at the routine operation mode. The gyro 
                         measurements are used to build the attitude estimation error model 
                         in which the state are estimated by means of a recursive filter. 
                         In a previous study, the attitude estimation error covariance was 
                         analyzed considering that both star trackers have constant 
                         accuracy. However, since the satellite will be placed on a 
                         sun-synchronous orbit pointing towards Earth, then each star 
                         tracker will have different set of stars in their field of view 
                         throughout the orbit. Thus, the measurement accuracy of these 
                         sensors will vary over the year. The star tracker manufacturer 
                         supplied a map that provides the sensor accuracy given the 
                         ascension and declination of its boresight axis represented in the 
                         J2000 reference frame. This new information is used to extend the 
                         aforementioned previous study to compute more realistically the 
                         statistics of the satellite attitude estimation errors. Moreover, 
                         this study analyzes the estimation accuracy under different 
                         scenarios of sensor failures.",
  conference-location = "Laurel, USA",
      conference-year = "May 5, 2014",
                label = "self-archiving-INPE-MCTI-GOV-BR",
             language = "en",
           targetfile = "ISSFD24_Paper_S4-1_Chagas.pdf",
        urlaccessdate = "26 abr. 2024"
}