分析了离散时间线性系统模型参数估计误差的收敛性和收敛速度，对参数估计误差服从渐近正态分布的一些条件进行了讨论。
The convergent property and convergent rate of parameter estimation error are analyzed . Some sufficient conditions are given to guarantee the asymptotic normality of parameter estimation error.
研究结果表明：在低信噪比条件下，激光二极管雷达测距数据的离散分布将明显偏离正态分布；
The results show that:in the low SNR conditions, the discrete distribution of the laser diode radar ranging data will significantly deviate from the normal distribution;
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