This paper presents an event-triggered attitude control method for an underactuated spacecraft with only two bounded body-axis torques. Gyroscopic coupling supplies the missing control action: two periodic angular-rate references generate the average gyroscopic rate product required to regulate the unactuated axis. A relative-plus-absolute event condition updates the bounded torque command, while a zero-order hold and a timeout provide implementable inter-event intervals. An elementary energy argument establishes asymptotic stability of the explicitly defined nominal averaged local error model, while a nonlinear simulation assesses the complete implementation. Under a 2 N$\cdot$m torque lim... More >

Lyapunov functions underpin the stability analysis and controller synthesis for aerospace vehicles, from spacecraft attitude control to autonomous flight systems and UAV swarm coordination. This review discusses the development of computational Lyapunov function synthesis methods. Within this scope, it traces the evolution from traditional Sum-of-Squares (SOS) programming to artificial intelligence symbolic discovery technologies, prompted by the increasing complexity of nonlinear systems. Specifically, the following stages can be identified: computational relaxation methods constrained by polynomial templates; data-driven paradigms leveraging neural network-based empirical approximations; a... More >

Aiming at the interrupt storm performance bottleneck existing in high-speed gyro attitude signal acquisition of aerospace vehicles, an embedded heterogeneous multi-core data acquisition system based on Xilinx ZYNQ-7000 SoC is proposed for inertial measurement unit (IMU) gyro signal sampling. On the hardware layer, a sensor data interface IP conforming to AXI4-Stream protocol is designed in programmable logic (PL) to collect high-frequency gyro original signals, and an AXI DMA controller builds a wideband direct peripheral-DDR transmission channel to realize zero-copy data writing, greatly reducing processor resource occupation under continuous inertial attitude sampling. On the software laye... More >