Event-Based Predefined-Time Deployment Control for Space Triangular Tethered Satellite System With Input Quantization

The problem of space triangular tethered satellite system deployment in the presence of external disturbances, input quantization, and limited communication from the controller to the actuator is investigated in this article. A disturbance-based predefined-time sliding mode controller is employed to ensure the system converges to the neighborhood of zero without depending on initial conditions. An input quantizer and an event-triggered mechanism are integrated into the proposed controller to reduce the frequency and bandwidth of data transmission from controller to actuator. An adaptive law is considered to counteract the control input chattering produced by quantization errors and event-triggered input errors. The whole proposed control scheme guarantees that the closed-loop system is semiglobally stable and converges to a stable region at the predefined time. Finally, the effectiveness of the proposed scheme is confirmed by simulation tests.