Estimation of unknown noise statistics quantity and estimation of signal states are alternatively done, this method is applied to GPS positioning, Computer simulation shows the approach is efficient.

将未知噪声统计量的估计与信号状态估计交替进行的算法引入G P S定位，计算机模拟结果表明效果很好。

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Pessen does present a quantity of examples, together with some refreshingly intelligible statistics, to establish the existence of an inordinately wealthy class.

佩森确实提出了大量的例子，以及一些令人耳目一新的、易于理解的统计数据，来证明一个异常富有阶级的存在。

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It should be pointed out that the results of mathematical statistics have a certain representation, but it is restricted by the quantity and quality of samples.

应该指出，数理统计的结果具有一定的代表性，但是这一结果受到样本的数目和质量的控制。

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