Unstationnary Control of a Launcher Using Observer-Based Structures

O. Voinot, D. Alazard, B. Clément

Research output: Contribution to conferencePaperpeer-review

2 Citations (Scopus)


This paper deals with the design of a gain-scheduled controller for the attitude control of a launcher during atmospheric flight. The design is characterized by classical requirements such as phase/gain margins and flexible mode attenuations as well as time-domain constraints on the response of angle of attack to a worst-case wind profile. Moreover, these requirements must be fulfilled over the full atmospheric flight envelope and must be robust against parametric uncertainties. In order to achieve this goal, we propose a method based on minimal observer-based realizations of arbitrary stabilizing compensators. An original technique to assign the closed-loop dynamics between the state-feedback dynamics and the state-estimation dynamics is presented for the H, compensators case. The structure is used to mix various specifications through the Cross Standard Form (CSF) and to perform a smooth gain scheduling interpolation through an Euler-Newton algorithm of continuation.

Original languageEnglish
Number of pages6
Publication statusPublished - Jun 2003
Externally publishedYes
Event2003 American Control Conference - Denver, CO, United States
Duration: 4 Jun 20036 Jun 2003


Conference2003 American Control Conference
Country/TerritoryUnited States
CityDenver, CO


  • Cross Standard Form
  • Gain scheduling
  • Launcher
  • Multi-objective synthesis
  • Observer-based
  • Robustness


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