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European Space Agency,
Noordwijk, The Netherlands.
Before, I was with the
Institute for Systems and Robotics (ISR)
Instituto Superior Técnico (IST)
Lisbon, Portugal
Contacts
Electronic Address:
sbras [at] isr [.] ist [.] utl [.] pt
Research Interests
Flight dynamics
Autonomous orbit control
Attitude and position estimation
Nonlinear systems
Lyapunov methods
Linear time-vaying systems
Set-valued observers
Publications
Ph.D. thesis
Journal Papers
2017
Integrated Visual Servoing Solution to Quadrotor Stabilization and Attitude Estimation Using a Pan and Tilt Camera, David Cabecinhas, Sérgio Brás, Rita Cunha, Carlos Silvestre, Paulo Oliveira 2017, IEEE Transactions on Control Systems Technology, 2017
2016
Nonlinear Observer for 3D Rigid Body Motion Estimation using Doppler Measurements,Sérgio Brás, Maziar Izadi, Carlos Silvestre, Amit Sanyal, and Paulo Oliveira, IEEE Transactions on Automatic Control, 2016
2015
Fault Detection and Isolation in Inertial Measurement Units Based on Bounding Sets, Sérgio Brás, Paulo Rosa, Carlos Silvestre, Paulo Oliveira, IEEE Transactions on Automatic Control, vol.60, no.7, pp.1933-1938, Jul., 2015
2013
Global Attitude and Gyro Bias Estimation Based on Set-Valued Observers, Sérgio Brás, Paulo Rosa, Carlos Silvestre, Paulo Oliveira, Systems & Control Letters, Volume 62, Issue 10, Oct., 2013, pp. 937-942, (DOI: 10.1016/j.sysconle.2013.06.008). (MATLAB implementation)
Nonlinear Attitude Observer Based on Range and Inertial Measurements, Sérgio Brás, Rita Cunha, Carlos Silvestre, Paulo Oliveira, IEEE Transactions on Control Systems Technology, Volume 21, Issue 5, Sep., 2013, pp. 1889-1897, (DOI: 10.1109/TCST.2012.2213821).
2011
A Nonlinear Attitude Observer Based on Active Vision and Inertial Measurements, Sérgio Brás, Rita Cunha, José Vasconcelos, Carlos Silvestre, Paulo Oliveira, IEEE Transactions on Robotics, Volume 27, Issue 4, Aug., 2011, pp. 664-677, (DOI: 10.1109/TRO.2011.2112950).
Conference Papers
2022
On the Orbit Control of Near Repeat Cycle Orbits: The Case of the Biomass Mission, S. Brás, I. Barat, B. Duesmann, 73rd International Astronautical Congress (IAC), Paris, France, Sept. 18-22, 2022
On-Board Images to Specify and Commission the ADCS, B. Segret, S. Bammens, S. Brás, D. Marszk, V. Shiradhonkar, V. Zelenevskiy, D. Evans, 4S Symposium, Vilamoura, Portugal, 2022
On-board images to characterize a CubeSat’s ADCS, B. Segret, S. Bammens, S. Brás, D. Marszk, V. Shiradhonkar, V. Zelenevskiy, D. Evans, 36th Annual Small Satellite Conference, Utah, U.S.A, 2022
2018
Nonlinear Observer for Attitude Estimation and Rate Gyro Calibration, S Brás, 69th International Astronautical Congress (IAC), Bremen, Germany, Oct 1-5, 2018
2016
Fast Low Earth Orbit Acquisition Plan Optimiser, S. Brás, I. Barat, B. Duesmann, 6th International Conference on Astrodynamics Tools and Techniques (ICATT), Darmstadt, Germany, Mar 14-17, 2016
2015
Evaluating Strategies For Ground Track Acquisition and Orbital Phasing, S. Brás, I. Barat, B. Duesmann, 25th ISSFD, Munich, Germany, Oct, 19-23, 2015
2013
Nonlinear Observer for 3D Rigid Body Motion, S. Brás, Izadi, M., Silvestre, C., Sanyal, A., and Oliveira, P., 52nd IEEE Conference on Decision and Control (CDC 2013), Florence, Italy, December 10-13, 2013..
2012
Fault Detection and Isolation for Inertial Measurement Units, S. Brás, P. Rosa, C. Silvestre, P. Oliveira, 51th IEEE Conference on Decision and Control (CDC 2012), Maui, Hawaii, USA, December 10-13, 2012..
Integrated Solution to Quadrotor Stabilization and Attitude Estimation Using a Pan and Tilt Camera, D. Cabecinhas, S. Brás, C. Silvestre, P. Oliveira, R. Cunha, 51th IEEE Conference on Decision and Control (CDC 2012), Maui, Hawaii, USA December 10-13, 2012.
Set-Valued Observers for Attitude and Rate Gyro Bias Estimation, S. Brás, P. Rosa, C. Silvestre, P. Oliveira, 50th 2012 American Control Conference, Montréal, Canada, June, 2012.
2011
Optimal Attitude Estimation Using Set-Valued Observers, S. Brás, P. Rosa, C. Silvestre, P. Oliveira, 50th IEEE Conference on Decision and Control, Orlando, FL, USA, December , 2011.
An Experimentally Validated Attitude Observer Based on Range and Inertial Measurements, S. Brás, C. Silvestre, P. Oliveira, J. F. Vasconcelos, R. Cunha, 18th IFAC World Congress, Milan, Italy, September , 2011.
2010
Experimental Evaluation of a Nonlinear Attitude Observer Based on Image and Inertial Measurements, S. Brás, R. Cunha, J. F. Vasconcelos, C. Silvestre, and P. Oliveira, 2010 American Control Conference (ACC), Baltimore, Maryland, USA, June 2010.
2009
Nonlinear Attitude Estimation Using Active Vision and Inertial Measurementions, Sérgio Brás, Rita Cunha, José Vasconcelos, Carlos Silvestre, Paulo Oliveira, Proc. of CDC 2009 - 48th IEEE Conference on Decision and Control, Shangai, China, 2009
Pose Observers for Unmanned Air Vehicles, Sérgio Brás, José Vasconcelos, Carlos Silvestre, Paulo Oliveira, Proc. of ECC 2009 - 10th European Control Conference, Budapest, Hungary, 2009
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