一、噪声和随机过程噪声的随机性表现为它随时间的变化是无规则的、不可预测的.噪声来自两个方面.一是系统外部的,诸如电磁感应、温度涨落、市电干扰以及机械振动等;二是来自测量系统内部.噪声和通常的确知信号不同.确知信号可用少量参数来描述.噪声则不然,它不能表示为确定的时间函数,因而不能用有限个参数来描述.例如对于用相同材料、相同工艺制成的N个电阻,在相同条件下,测量 First, the stochastic nature of noise and random process noise is that it changes over time is irregular and unpredictable. Noise comes from two aspects: First, external systems such as electromagnetic induction, temperature fluctuations, mains interference and Mechanical vibration and so on. The second is from the measurement system. The noise is different from the usual signal, which can be described by a small number of parameters. However, the noise can not be expressed as a definite time function and can not be described by a limited number of parameters. For example, with the same material, the same process made of N resistance, under the same conditions, the measurement