Adaptive tracking control using synthesized velocity from attitude measurements

Abstract

The attitude tracking problem of uncertain rigid spacecraft without angular velocity measurements is addressed in this paper. The adaptive control law, which incorporates a velocity-generating filter from attitude measurements, is shown to ensure the asymptotic convergence of the attitude and angular velocity tracking errors despite unknown spacecraft inertia. Simulation results are presented to illustrate the theoretical results.

Adaptive attitude control of spacecraft without velocity measurements using Chebyshev neural network

“…(31) is carried out to examine the performance of the proposed control system. Firstly, the controller is tested on the nominal case, and then the performance of the controller is extensively evaluated under diverse conditions and is compared with the existing adaptive controller proposed by Wong et al [20] in the presence of parameter perturbation and external disturbances. Table 1 shows the values of the simulation parameters in the nominal case.…”

“…For the performance comparison, the adaptive controller proposed by Wong et al [20] is also briefly described in this section.…”

“…To solve the tracking control problem of spacecraft without velocity measurements, Wong et al [20] consider the following adaptive controller design where external disturbances are not considered in the spacecraft dynamics (1). The filter is given by [31] e f ¼ Àke þ p ð44Þ…”

“…However, the proposed control laws in [16][17][18] require exact knowledge of spacecraft mass moment of inertia tensor. This constraint was overcome in [19,20] by use of the adaptive output feedback controller. However, the assumption of ''linearity in the unknown parameters'' is required and ''regression matrices'' are to be determined.…”

“…The adaptive control methods, which linearly parameterize the motion of spacecraft system models have been employed to solve the attitude control problem of spacecraft with uncertainties [2][3][4]19,20]. One major problem of the adaptive control approaches is that certain functions must satisfy the assumption of ''linearity in the parameters'', and tedious analysis is required to determine ''regression matrices''.…”