基于非等量采样的伪码同步技术研究

针对数字通信系统中伪随机噪声(pseudo-random noise, PN)码同步技术的同步精度受限于采样间隔的问题，结合可变群时延的高精度同步思想，利用采样点位置偏移量的变化，推导出了非等量采样(non-commensurate sampling, NCS)下的PN码相关函数解析表达式，提出了基于精度因子的NCS率选取准则，通过精度因子可快速判断出NCS后PN码的同步精度下限。在此基础上，分析了码序列周期、接收机前端滤波器等附加因素对PN码同步精度的影响。对NCS率选取准则的研究，为优化数字通信系统设计提供了理论指导，达到以低硬件消耗实现高精度同步的目的。

Research on pseudo-random noise code synchronization technology based on non-commensurate sampling

Aiming at the problem that the synchronization accuracy of the pseudo-random noise (PN) code synchronization technology in digital communication systems is limited by the sampling interval, combined with the high-precision synchronization idea of variable group delay and the change in the position offset of the sampling point, the analytic expression of the PN correlation function under non-commensurate sampling (NCS) is presented, and the selection criterion of NCS rate based on the precision factor is proposed, the lower limit of PN code synchronization accuracy processed by NCS can be quickly determined by the precision factor. On this basis, the influence of the code sequence period, the receiver front-end filter and other additional factors on PN code synchronization accuracy is analyzed. The research on the selection criteria of the NCS rate provides theoretical guidance for optimizing the design of digital communication systems, and achieves the purpose of high-precision synchronization with low hardware consumption.