中圖分類號： TN927 文獻標識碼： A DOI：10.16157/j.issn.0258-7998.201167 中文引用格式： 宋艷,，應斌杰，楊成鋼,，等. 基于ZYNQ的PTP授時精度測量方法與實現(xiàn)[J].電子技術(shù)應用,，2021，47(6)：115-118,，130. 英文引用格式： Song Yan,，Ying Binjie，Yang Chenggang,，et al. A method and implementation of PTP timing accuracy measurement based on ZYNQ[J]. Application of Electronic Technique,，2021,，47(6)：115-118，130.
A method and implementation of PTP timing accuracy measurement based on ZYNQ
Song Yan1,，Ying Binjie1,，Yang Chenggang1，Hao Zifei1,，Mao Lizhen2
1.Lishui Power Supply Company,，State Grid Zhejiang Electric Power Co.，Ltd,，Lishui 316021,，China； 2.Hangzhou Quantum Sensing Technology Co.,，Ltd.,，Hangzhou 310019，China
Abstract： Aiming at the difficulties of PTP timing accuracy measurement, this paper puts forward using μCOS operating system and LWIP protocol stack on ZYNQ SOC to realize PTP timing accuracy measurement. Accurate system time and clock source difference are obtained by receiving GNSS signals, and the system time is synchronized to the nanosecond counter of ZYNQ by hardware. The ZYNQ EMAC interface is used to acquire the observation time of PTP frames, and the source difference is used to compensate the measurement time. Finally, an accurate time stamps are obtained, which can be used to measure the timing accuracy of the PTP master clock. The test results show that using this method to measure PTP clock, the measurement accuracy is better than 10 ns.
Key words : PTP,；timing,；GNSS；time stamp
0 引言
精確時間協(xié)議(Precision Time Protocol,，PTP)是一種高精度網(wǎng)絡(luò)時間同步協(xié)議[1-2],，具體內(nèi)容由IEEE 1588協(xié)議定義。IEEE1588協(xié)議目前有V1和V2兩個版本,。其支持多種形式的傳輸,，比如UDP/IPv4、UDP/IPv6以及IEEE 802.3等,。PTP與網(wǎng)絡(luò)授時協(xié)議(Network Timing Protocol,，NTP)的主要區(qū)別是，PTP是在物理層實現(xiàn)而NTP是在應用層實現(xiàn),。因此,，PTP比NTP具有更高的同步精度。PTP可以達到亞微秒級授時精度,，在網(wǎng)絡(luò)的節(jié)點(交換機)支持PTP協(xié)議的情況下,，能夠?qū)崿F(xiàn)納秒量級的授時精度[3-4]。
