厄密是量子力学领域的一个专有词汇。如果说两个物理量是对易的，说明两个物理量能同时被测定。所有可观察的物理量都相应厄密算符。
并对位相算符厄密性问题进行讨论。
Finally, the hermiticity of phase operator (?) is discussed.
换言之，矩阵的厄密性在幺正变换下保持不变。
In other words, the Hermiticity of a matrix is invariant under unitary transformations.
该算法为了减小距离的不可观测性对于非线性滤波的影响，在假设的多段距离间隔中采用并行的高斯-厄密特滤波并加权获得目标的状态估计。
In order to decrease the influence of non-observability of distance, based on Gauss-Hermite filter, multihypothesis of distance is adopted to operate collateral filter.
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