Aircraft autopilot analysis and envelope protection for operation under icing conditions

Vikrant Sharma, Petros G. Voulgaris, Emilio Frazzoli

Research output: Contribution to journalArticlepeer-review


The behavior of a typical autopilot structure is studied for flight under icing conditions. The study is based on a Twin Otter aircraft model and focuses on the pitch attitude behavior. A quadratic stability analysis using linear matrix inequalities is conducted to show that the time-varying closed-loop system maintains quadratic stability under icing conditions. In addition, the problem of envelope protection in the presence of icing is considered; in particular, how to maintain the angle-of-attack within the stall limits which are time varying. Based on steady-state behavior, a practical envelope protection scheme is developed and tested via simulation.

Original languageEnglish (US)
Pages (from-to)454-465
Number of pages12
JournalJournal of Guidance, Control, and Dynamics
Issue number3
StatePublished - 2004

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Aerospace Engineering
  • Space and Planetary Science
  • Electrical and Electronic Engineering
  • Applied Mathematics


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