全新卫星双向时间比对调制解调器设计
发布时间：2018-10-05 19:04
【摘要】：卫星双向时间频率传递是目前被广泛应用的远距离高精度时间频率量值传递方法,其核心组成设备是双向时间比对调制解调器.文章介绍了由北京无线电计量测试研究所研制的卫星双向时间比对调制解调器,该设备采用直接序列扩频(DSSS)和二进制相移键控(BPSK)方式完成时间信号的调制,采用快速傅里叶变换(FFT)算法实现对信号的快速搜索和捕获;利用二阶锁频辅助三阶锁相环路达到动态性能和跟踪精度的平衡;采用二阶延迟锁定环(DLL)来实现对码相位的精密跟踪和测量.采用两个1.2m口径天线的双向比对地球站进行短基线卫星双向时间比对试验,试验结果表明当系统工作在2.5MChip/s码速率时,该调制解调器的时间比对精度(标准偏差(1σ))能够达到0.13ns.
[Abstract]:The bidirectional time-frequency transfer of satellite is widely used at present, which is widely used in long-distance and high-precision time-frequency value transmission. The core of the method is the bidirectional time comparison modem. This paper introduces a satellite bidirectional time comparison modem developed by Beijing Radio Metrology and testing Institute. The device uses direct sequence spread spectrum (DSSS) and binary phase-shift keying (BPSK) to modulate the time signal. The fast Fourier transform (FFT) algorithm is used to search and capture the signal, and the second-order frequency-locked loop is used to assist the third-order phase-locked loop to achieve the balance of dynamic performance and tracking accuracy. The second order delay locking loop (DLL) is used to accurately track and measure the code phase. The short baseline satellite bidirectional time comparison test using two 1.2m aperture antennas shows that the time comparison accuracy (1 蟽) of the modem can reach 0.13 ns when the system is operating at 2.5MChip/s code rate.
【作者单位】： 北京无线电计量测试研究所;计量与校准技术国家级重点实验室;
【分类号】：TN915.05
本文编号：2254525
[Abstract]:The bidirectional time-frequency transfer of satellite is widely used at present, which is widely used in long-distance and high-precision time-frequency value transmission. The core of the method is the bidirectional time comparison modem. This paper introduces a satellite bidirectional time comparison modem developed by Beijing Radio Metrology and testing Institute. The device uses direct sequence spread spectrum (DSSS) and binary phase-shift keying (BPSK) to modulate the time signal. The fast Fourier transform (FFT) algorithm is used to search and capture the signal, and the second-order frequency-locked loop is used to assist the third-order phase-locked loop to achieve the balance of dynamic performance and tracking accuracy. The second order delay locking loop (DLL) is used to accurately track and measure the code phase. The short baseline satellite bidirectional time comparison test using two 1.2m aperture antennas shows that the time comparison accuracy (1 蟽) of the modem can reach 0.13 ns when the system is operating at 2.5MChip/s code rate.
【作者单位】： 北京无线电计量测试研究所;计量与校准技术国家级重点实验室;
【分类号】：TN915.05
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