安岳松，李娟，项晓，等. 基于外腔倍频的双色高重频飞秒激光产生[J]. 时间频率学报，2021，44(2):77-84.

　　AN Yue-song, LI Juan, XIANG Xiao, et al. Generation of dual-color high repetition rate femtosecond pulses with an external frequency-doubled cavity[J]．Journal of Time and Frequency, 2021, 44(2)：77-84.

　　许朋. 镱原子光频标中泵浦光特性的研究[J]. 时间频率学报，2021，44(2):85-91.

　　XU Peng. The research of the characteristics of pump light in ytterbium atomic optical frequency standard[J]．Journal of Time and Frequency, 2021, 44(2)：85-91.

　　李会锦，刘音华，李孝辉.局域无线时间比对系统中硬件零延迟的实现[J]. 时间频率学报, 2021, 44(2):92-101.

　　LI Hui-jin, LIU Yin-hua, LI Xiao-hui. Implementation of hardware zero delay in local wireless time comparison system[J]．Journal of Time and Frequency, 2021, 44(2)：92-101.

　　许龙霞，任烨，何雷，等. EGNSS授时服务安全性发展综述[J]. 时间频率学报，2021，44(2):102-112.

　　XU Long-xia, REN Ye, HE Lei, et al. Review of safety analysis of EGNSS time service[J]．Journal of Time and Frequency, 2021, 44(2)：102-112.

　　贺振华，李锡瑞，蒋超. 网络嗅探技术在时频诊断中的应用[J]. 时间频率学报，2021，44(2):113-119.

　　HE Zhen-hua, LI Xi-rui, JIANG Chao. A fault diagnosis method of time-frequency equipment based on network sniffing technology[J]．Journal of Time and Frequency, 2021, 44(2):113-119.

　　安元元，李伟超，王伟，等. 一种低轨卫星星座测控地面站调度策略研究[J]. 时间频率学报，2021，44(2):120-131.

　　AN Yuan-yuan, LI Wei-chao, WANG Wei, et al. Research on schedule strategy of ground stations for LEO satellites[J]．Journal of Time and Frequency, 2021, 44(2): 120-131.

　　陈校非，卢晓春，王雪，等. 星地链路的Cn频段导航信号设计与测距性能分析[J]. 时间频率学报，2021，44(2):132-141.

　　CHEN Xiao-fei, LU Xiao-chun, WANG Xue, et al. Navigation signal design and ranging performance analysis of Cn band based on satellite-to-ground link[J]．Journal of Time and Frequency, 2021, 44(2):132-141.

　　王维，张志斌，KALIUZHNYI MyKolay，et al. 微型VLBI系统的温度效应改正与精度评估[J]. 时间频率学报，2021，44(2):142-152.

　　WANG Wei, ZHANG Zhi-bin, KALIUZHNYI MyKolay, et al. Thermal effect correction and accuracy evaluation on MVLBI[J]．Journal of Time and Frequency, 2021, 44(2): 142-152.