基于钟驾驭模式的定时接收机绝对校准

发布时间：2018-07-04 15:06

本文选题：钟驾驭 + 绝对校准　；参考：《仪器仪表学报》2014年09期

【摘要】：卫星导航中定时接收机的延迟校准一直是个难点,不同类型接收机的校准方法有所不同,需要研究有针对性的解决方法。在对无1PPS信号输入接收机分析的基础上,研究了基于钟驾驭模式接收机延迟的绝对校准方法。相比NRL实验室选用的有1PPS信号输入接收机而言,钟驾驭模式的接收机延迟除了受伪距测量、硬件链路时延影响以外,还与系统时钟分辨率有关,时钟分辨率越高的接收机其本地钟向卫星钟的驾驭性能越好,对应的通道延迟也越小。试验选用模拟器Spirent GSS8000分别对Novatel和Septentrio两款不同型号的接收机进行校准,受跟踪环路和射频滤波器群时延的影响,不同型号接收机在不同频段和不同伪码下的延迟存在差异。Novatel接收机对C/A码1.2 ns的不确定度优于P码的1.5 ns,Septentrio接收机L1频段1.5 ns的不确定度大于L2频段的1.3 ns,但由于系统时钟的不稳定,双频电离层改正后Septentrio接收机的不确定度4.3 ns要高于Novatel的3.8 ns。
[Abstract]:The delay calibration of timing receivers is always a difficult problem in satellite navigation. The calibration methods of different types of receivers are different. Based on the analysis of the signal input receiver without 1PPS, the absolute calibration method of receiver delay based on clock control mode is studied. Compared with the 1PPS signal input receiver selected by NRL Laboratory, the receiver delay in the clock control mode is related to the system clock resolution in addition to the pseudo-range measurement and the hardware link delay. The higher the clock resolution, the better the control performance of the local clock to satellite clock, and the smaller the channel delay. In the experiment, the simulator Spirent GSS8000 is used to calibrate Novatel and Septentrio two different types of receivers, which are affected by tracking loop and group delay of RF filter. The uncertainty of Novatel receiver for C / A code 1.2 ns is better than that of P code's 1.5 ns in L1 band is higher than that in L2 band, but the uncertainty of Novatel receiver is higher than that of L2 band. The instability of the system clock, The uncertainty of Septentrio receiver after correction of dual-frequency ionosphere is 4.3 ns higher than that of Novatel 3.8 ns.
【作者单位】：中国科学院国家授时中心;中国科学院精密导航定位与定时技术重点研究室;中国科学院研究生院;
【基金】：国家自然科学基金委国家重大科研仪器设备研专项(61127901) 西部之光人才培养项目资助
【分类号】：TN965.5

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