Ronan Arraes Jardim Chagas, Ph.D.


I am currently a Space Systems Engineer with the Brazilian National Institute for Space Research (INPE). My responsibilities include:

  • Space mission analysis;
  • Specification of attitude and orbit control subsystem (AOCS);
  • Design of strategies and procedures for satellite attitude and orbit control;
  • Mathematical modeling of AOCS sensors and actuators;
  • Dynamic modeling of satellite attitude and orbit;
  • Development of analysis and simulation software for satellite trajectory and attitude;
  • Perform functional and performance testing of AOCS sensors and actuators;
  • Pointing, power, and fuel balancing; and
  • Estimation of satellite lifetime.

At the moment I am involved with the Brazilian satellite Amazonia-1 and with other research projects.

I received my Bachelor of Science degree in Control and Automation Engineering from University of Brasília (UnB) in 2008, being awarded with the best student prize, given by the Faculty of Technology and the Rector of University of Brasília.

In 2007, I was accepted to the Internship Program of Johnson Controls’ building efficiency division (Brasília branch) and, just after graduating, I was hired as an Application Engineer. In this position, I projected and commissioned a myriad of building automation systems, managed the installation teams, and participated in the drafting of the winning technical proposal for the Local Area Network bidding process of the New Quito’s International Airport.

In early 2009, I joined the Master’s program in Electronics and Computer Engineering of the Instituto Tecnológico de Aeronáutica. By the end of that year, I was accepted into the direct Ph.D. program at the same institution, which was concluded in 2012. My studies were funded by a scholarship of the project FINEP/CTA/INPE SIA (Inertial Systems for Aerospace Applications, in Portuguese), which was created by the Brazilian government to develop the national aerospace program. My thesis title is Distributed Estimation of Aided INS Errors and it can be obtained at Publications section.

My research areas of interest are:

Research Areas of Interest

  • Mission analysis;
  • Attitude and orbit control subsystem (AOCS);
  • Celestial mechanics;
  • Trajectory planning.
  • Kalman filtering;
  • Extended Kalman filtering;
  • Unscented Kalman filtering;
  • Particle filtering;
  • Maximum likelihood estimate;
  • Distributed estimation.
  • Navigation algorithms;
  • INS aiding using non-inertial sensors (GPS / Magnetometer / Camera / etc.);
  • State-error model observability analysis;
  • Nonlinear filtering techniques for aerospace applications.