误差区域 meaning in English

error area
error band

In order to counteract the effect due to the unmodeled perturbation , the h tracking control requires to solve a modified algebraic riccati - like matrix equation . the derived hybrid adaptive - robust tracking control scheme guarantees that all the signals and states are bounded , the tracking error is uniformly ultimately bounded and h tracking performance is achieved
所提出的控制方案保证跟踪误差在有限的迭代步骤内收敛到任意指定的误差区域并且一直保持在指定的区域内，而且保证每一迭代步系统信号有界。