state observer的用法和样例：
例句
- A reduced-order state observer and a control law based on the observer are designed.
建立了相应的数学模型，并在此模型的基础上，设计了降维状态观测器和基于观测器的反馈控制律。 - Additionally, a state-space observer was designed to estimate the sideslip angle, which was difficult to measure directly.
由于质心侧偏角信号难以直接测量，设计了状态观测器对该信号进行估计。
