This paper gives a necessary condition for the admissibility of a nonnegative, quadraticestimator for error variance in linear model with respect to restricted ellipsoidal parameter space.
本文给出了线性模型中椭球约束下，误差方差非负二次估计可容许的一个必要条件。
2
The discussion includes linear regulator, state estimator, observer for a linear functional of state, and linear quadratic control with incomplete or noisy measurements.
讨论的问题包括线性调节器，状态估计器，状态线性函数观测器，及不完全或有噪声测量的线性二次控制。
3
To solve the problem, a non-quadratic objective estimator, the weighted least absolute value (WLAV) estimator, and least mean squares (LMS) estimator are proposed.