Adaptive techniques applied to maneuvering re-entry vehicle tracking

An adaptive filter is developed which tracks a re-entry vehicle which is ballistic at first and suddenly executes a deterministic or random maneuver. To verify when the maneuver occurs as soon as possible, on the average, a Wald Sequential Test is used. This decision then changes the gains of the acceleration state variables via a stochastic approximation algorithm, which generates the input covariance.