@Article{RomeroSouz:2019:StRiEq,
               author = "Romero, Alessandro Gerling and Souza, Luiz Carlos Gadelha de",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade Federal do ABC (UFABC)}",
                title = "State-dependent Riccati equation controller using Java in remote 
                         sensing CubeSats",
              journal = "Journal of Applied Remote Sensing",
                 year = "2019",
               volume = "13",
               number = "3",
                pages = "e032509",
                month = "July",
             keywords = "CubeSat, state-dependent Riccati equation, Java, nonlinear, 
                         attitude.",
             abstract = "STRaND and PhoneSat programs have attracted the attention of the 
                         aerospace community by applying, in CubeSats, commercial 
                         off-the-shelf smartphones based on Googles Android. In Android, 
                         the development commonly applies Java hence this language is a 
                         natural candidate for the attitude and orbit control subsystem 
                         (AOCS). Moreover, such AOCS can be designed with success by linear 
                         control theory; however, the linearized models are not able to 
                         represent all the effects of the nonlinear terms present in the 
                         dynamics. Therefore, nonlinear control techniques can yield better 
                         performance. An example is the Nano-Satellite Constellation for 
                         Environmental Data Collection, used as the reference in this work, 
                         a set of remote sensing CubeSats from the Brazilian National 
                         Institute for Space Research, in which the AOCS must stabilize the 
                         satellite in three-axes. We present the investigation of a 
                         state-dependent Riccati equation (SDRE) controller, a nonlinear 
                         controller, based on attitude errors given by quaternions. The 
                         investigation uses Java, accordingly, it can run on an Android 
                         operating system in a CubeSat, and it has low cost. Two 
                         controllers (linear and SDRE) were evaluated using a Monte Carlo 
                         perturbation model. The initial results show that the SDRE 
                         controller provides better performance.",
                  doi = "10.1117/1.JRS.13.032509",
                  url = "http://dx.doi.org/10.1117/1.JRS.13.032509",
                 issn = "1931-3195",
             language = "en",
           targetfile = "032509_1.pdf",
        urlaccessdate = "23 abr. 2024"
}