PRN是伪随机噪声码（pseudo random noise code）的缩写，不是卫星的编号，C/A码和P码均为伪噪声码，卫星导航所用的伪噪声码，是噪声通讯的成功实践。所谓伪噪声码，简而言之，是一个具有一定周期的取值0和1的离散符号串，它具有类似于白噪声的自相关函数。
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ABBREVIATION for in prescriptions pro re nata (处方上书)当需要时
PRN combined feature selection algorithm is proposed.
并提出改进的PRN组合特征选择算法。
Methods: We observe the effect of using Intravenous Catheter System with PRN 139 cases and analyse the factors which influence it.
方法：观察139例浅静脉留置针临床使用效果，分析其影响因素。
The former is used to achieve the fine estimation of the carrier frequency while the later is used to achieve the fine estimation of the code delay of the PRN code.
载波跟踪环用于对接收信号的载波频率进行精确跟踪，而码跟踪环是用于实现伪随机码延时的精确对准。
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