Stephane Dussy

European Space Agency | ESA · Directorate of Launchers

With an almost 1:1 impact on payload capacity, improvements on a launcher upper stage result in significant improvements in launcher performance. Starting in 2018 work has been ongoing in the FLPP on an optimised upper stage for an evolution of Ariane 6, where configuration studies have shown a payload performance gain of over two tonnes for GTO mi...

The fast-paced growth of the space sector brings in new challenges especially with upcoming complex missions combining multi-orbit deliveries and/or on-orbit servicing such as Active Debris Removal (ADR). Europe has taken up the challenges and is working on extending its launchers portfolio and capabilities. In this framework, a new add-on, the kic...

The Space Rider Programme, previously named Pride, is an ESA programme whose objective is to define and develop an affordable reusable European space transportation system to be launched by VEGA-C, to be used as a platform for several types of payload applications. Payloads and related applications strongly drive the definition of Space Rider missi...

The atmospheric re‐entry domain is a cornerstone of a wide range of space applications, ranging from reusable launcher stages developments, robotic planetary exploration, human space flight, to innovative applications such as reusable research platforms for in orbit validation of multiple space applications technologies. The Intermediate experiment...

The paper details the IXV avionics presenting the architecture and the constituting subsystems and equipment. It focuses on the novelties introduced, such as the Ethernet-based protocol for the experiment data acquisition system, and on the synergy with Ariane 5 and Vega equipment, pursued in order to comply with the design-to-cost requirement for...

This paper presents the Multiple Heads algorithms developed for HYDRA SODERN APS based Star Sensor and the validation approach. The Multiple Heads algorithms were chosen in order to manage the multiple fields of view of the sensor as if it was a single wide field of view sensor. The main goal was the optimization of the Optical Heads availability a...

This paper presents an analysis of the needs for a European Inertial Measurement Unit for space applications. Accelerometer precision re quirements for various applications are described, with an emphasis on Entry, Descent and Landing (EDL) missions. A technology survey identifies the most promising technologies a nd describes their respective meri...

HYDRA is EADS SODERN new product line of APS-based autonomous star trackers. The baseline is a multiple head sensor made of three separated optical heads and one electronic unit. Actually the concept which was chosen offers more than three single-head star trackers working independently. Since HYDRA merges all fields of view the result is a more ac...

This paper describes the characterization and testing of the Systron Donner QRS11 MEMS rate sensors for the GIOVE-A mission. The rate sensing requirements for this mission exceeded the QRS11 data sheet specifications; hence testing was required to prove the unit's enhanced performance. This paper describes the test methods used, as well as the resu...

Given a class of nonlinear, parameter-dependent, perturbed systems, we propose a methodology for the synthesis of an output-feedback controller such that the closed-loop system satisfies a number of specifications. Our specifications include stability, disturbance rejection, command input and output peak bounds. Some parameters and/or states that a...

RESUME In support of the ESA strategic planning for space gyros a MEMS Rate Sensor (MRS) development has been initiated. This migration of MEMS resonators to the space environment, providing a low-cost/low-mass/low-power 3-axis rate sensor, has successfully passed PDR for the detector selection, with electronics and unit design activities also star...

The Automated Transfer Vehicle (ATV) is a European Space Agency (ESA) funded unmanned spacecraft designed and developed by several European aerospace companies in the frame of the International Space Station (ISS). Its function is threefold: to supply the station with fret and propellant, to reboost ISS to a viable orbit and to retrieve waste from...

Implementation of a filter in a fixed-point digital hardware results in small errors during each step of the algorithm, induced by the inexact arithmetic structure of the real system (e.g., finite word-length effects). These errors can lead to unexpected behaviour since stability and performance are usually ensured for an idealised representation o...

Addresses the problem of robust diagonal stabilization for discrete-time systems. Linear matrix inequality (LMI) conditions are derived for the search of a diagonal solution to the associated Lyapunov equation. This approach can be applied to guarantee stability of quantized systems and to find numerous illustrative applications, e.g., for the desi...

The RTAC nonlinear control design benchmark problem is addressed using a multi-objective control methodology based on linear matrix inequalities and robust control. The approach hinges on the search for a common quadratic Lyapunov function ensuring various specifications (stability, ℒ2-gain, command input and output peak bounds) for the closed-loop...

When implementing a controller in a digital computer or when realizing digital filters, the numerical effects from the quantisation of the state, due to adder overflow, magnitude truncation or finite-wordlength format, may introduce severe nonlinearities. As soon as A/D and D/A conversions get involved, a behavioral study of the quantized system is...

Convex optimization involving Linear Matrix Inequality (LM1) constraints has recently emerged as a very powerful tool for solving a wide scope of complex engineering analysis and design problems. In this paper, we provide an overview of this approach and show how it can be applied to several important problems in automotive applications, including...

This report presents a numerical model to simulate the electromagnetic processes involved by electrically-charged relativistic fluids. The physical model is first given. Second, the numerical methods are explained with the various packages of the code RHEA, with indication of their performances, within a 1.5-dimensional framework. Results from test...

This paper presents an LMI-based methodology for the robust control of a class of uncertain discrete-time systems. Both stabilization and disturbance rejection are considered. In addition, some command input and output bounds can be specified. The control design is called “measurement-scheduling” in the sense that some parameters and/or states that...

This paper presents a new LMI-based algorithm for the robust control of Lur'e system. This algorithm is based on a "cone complementarity problem". It can be solved via a recent public domain Matlab toolbox. Both problems of robust exponential stabilization and disturbance rejection via £2-gain conditions are considered. In addition, this formulatio...

The RTAC (rotational/translational actuator) nonlinear control design benchmark problem is addressed using a multiobjective control methodology based on linear matrix inequalities and robust control. The approach hinges on the search for quadratic Lyapunov functions ensuring various specifications (stability, L₂-gain, command input and o...

Given a class of nonlinear, parameter-dependent, perturbed systems, we propose a methodology for the synthesis of an output-feedback controller such that the closedloop system satisfies a number of specifications. Our specifications include stability, disturbance rejection, command input and output peak bounds. Some parameters and/or states that ap...

This paper presents a new LMI-based algorithm for the robust control of Lur'e systems. For the output-feedback case, this algorithm is based on a "cone complementarity problem" that can be solved via a recent public-domain Matlab toolbox. In addition, the formulation includes various constraints such as command input and output bounds.

This paper presents a public domain toolbox built on top of the software LMITOOL and the Semidefinite Programming package. The Multiobjective Robust Control Toolbox is a collection of synthesis LMI-based tools for a large class of nonlinear uncertain systems. It provides solutions for the robust state- and output-feedback controller synthesis under...

Realization of digital filters or implementation of controllers in a digital computer may lead to unexpected instabilities resulting from the finite precision effects. Stability is usually ensured for an idealized discrete-time realization of the system. However, as soon as A/D and D/A conversions are involved, the quantization of the state of the...

Given a nonlinear parameter-dependent system, we seek an output feedback controller such that the closed-loop system satisfies a number of specifications. Our specifications include stability, command input and output peak bounds. The controller state-space matrices are allowed to depend on a set of measured parameters and/or nonlinearities, if any...