eLORAN系统的GRI组合设计研究  

Research on GRI Combination Design of eLORAN System

作　　者：刘时尧 张首刚[1,2] 华宇[1,3] LIU Shiyao;ZHANG Shougang;HUA Yu(National Time Service Centre,Chinese Academy of Sciences,Xi’an 710600,China;Key Laboratory of Time and Frequency Reference,Chinese Academy of Sciences,Xi’an 710600,China;Key Laboratory of Precision Navigation and Timing Technology,Chinese Academy of Sciences,Xi’an 710600,China;Graduate University of Chinese Academy of Sciences,Beijing 100039,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院时间频率基准重点研究室,西安710600 [3]中国科学院精密导航定位与定时技术重点研究室,西安710600 [4]中国科学院大学研究生院,北京100039

出　　处：《电子与信息学报》2022年第2期767-774,共8页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(11803040);中国科学院前沿科学重点研究项目(QYZDJ-SSW-JSC034)。

摘　　要：针对增强型罗兰(eLORAN)系统增补发射台站建设中的组重复周期(GRI)选择问题,该文主要从数学的角度出发,提出一种基于交叉干扰率的筛选算法。该算法首先考虑了最小可用组重复周期以及秒信息量的要求,并在此基础上通过比较与临近的罗兰C台站间的相对交叉干扰率进行1次筛选;之后通过排列组合进行两两比较并2次筛选;最后,综合考虑数据率要求、系统规范、无交叉干扰等条件,得到最优组重复周期组合。随后,鉴于新型eLORAN系统的高精度授时要求,在GRI最优组合中进行了优选。分析结果表明,该方法得出的优选组合的平均交叉干扰率与现有导航台链相当,同时可兼顾授时需求,可以为高精度地基授时系统建设提供参考性建议和理论依据。To solve the problem of Group Repetition Interval(GRI)selection in the construction of the enhanced LORAN(eLORAN)system supplementary transmission station,a screening algorithm based on cross interference rate is proposed mainly from the mathematical point of view.Firstly,this method considers the requirement of second information,and on this basis,conducts a first screening by comparing the mutual Cross Rate Interference(CRI)with the adjacent Loran-C stations in the neighboring countries.Secondly,a second screening is conducted through permutation and pairwise comparison.Finally,the optimal GRI combination scheme is given by considering the requirements of data rate and system specification.Then,in view of the high-precision timing requirements for the new eLORAN system,an optimized selection is made in multiple optimal combinations.The analysis results show that the average interference rate of the optimal combination scheme obtained by this algorithm is comparable to that between the current navigation chains and can take into account the timing requirements,which can provide referential suggestions and theoretical basis for the construction of high-precision ground-based timing system.

关 键 词：罗兰C 增强型罗兰 组重复周期 符合时间间隔 交叉干扰率 

分 类 号：TN961[电子电信—信号与信息处理]