Du Baoqiang, Tan Lanqin
School of Information Science and Engineering, Hunan Normal University, Changsha 410081, China.
Sensors (Basel). 2024 Jul 16;24(14):4606. doi: 10.3390/s24144606.
For the time and frequency signals of Beidou satellites, a high-accuracy phase frequency detection technology based on phase group synchronization is proposed. Using the Beidou receiver and satellite signals as the frequency standard and the measured signals, respectively. The Beidou receiver and the satellite signals are sent to the phase coincidence detector of the different frequencies to generate a phase coincidence point pulse, which is sent to the different frequency phase detector as a control signal to generate the phase differences between the Beidou receiver and satellite signals, and then complete the high-accuracy phase synchronization between the Beidou receiver and satellite signals. Experimental results show that when the delay resolution reaches ps level, the phase synchronization accuracy of the system can reach 10 ps, which has the characteristics of small phase noise, low development cost, simple circuit structure, and high synchronization accuracy compared with the traditional phase synchronization technologies. Therefore, it would be widely used in satellite positioning, astrometry, precision navigation, aerospace, satellite launch, power transmission, communications, radar, and other high-tech fields.
针对北斗卫星的时间和频率信号，提出了一种基于相位组同步的高精度相位频率检测技术。分别以北斗接收机和卫星信号作为频率标准和被测信号。将北斗接收机和卫星信号发送到不同频率的相位重合检测器，生成相位重合点脉冲，该脉冲作为控制信号发送到不同频率相位检测器，以产生北斗接收机和卫星信号之间的相位差，进而完成北斗接收机和卫星信号之间的高精度相位同步。实验结果表明，当延迟分辨率达到皮秒级时，系统的相位同步精度可达10皮秒，与传统相位同步技术相比，具有相位噪声小、开发成本低、电路结构简单、同步精度高等特点。因此，它将广泛应用于卫星定位、天体测量、精密导航、航空航天、卫星发射、输电、通信、雷达等高科技领域。
