伪随机序列、伪噪声(PN)码或伪随机码。可以预先确定并且可以重复实现的序列称为确定序列；既不能预先确定又不能重复实现的序列称随机序列；不能预先确定但可以重复产生的序列称伪随机序列。-Pseudo-random sequence, a pseudo noise (PN) code, or pseudo-random code. The sequence is called to determine the sequence can be pre-determined and can be repe