A Comparison of Six Robustness Tests Evaluating Missile Autopilot Robustness to Uncertain Aerodynamics

The robustness of a bank-to-turn missile autopilot to uncertain aerodynamic parameters is determined using six robustness tests. The six robustness tests are: 1) small gain theorem; 2) structured singular value; 3) stability hypersphere - polynomial; 4) stability hypersphere - Lyapunov; 5) Kharitonov's theorem; and 6) multiloop stability margin. Exact parameter variation tolerances were determined by a Monte Carlo eigen analysis and are compared with the theoretical predictions.