三频载波多普勒组合的北斗星载钟短稳评估方法

发布时间：2018-03-11 20:38

本文选题：北斗卫星导航系统　切入点：星载原子钟　出处：《中南大学学报(自然科学版)》2014年01期 　论文类型：期刊论文

【摘要】：针对北斗系统目前尚无公开的精密钟差产品,一般用户无法获取精确的卫星钟短期稳定度参数的问题,提出一种适用于北斗系统的较容易实现的星载钟短稳评估方法。该方法基于单站接收机的观测数据,构建三频无电离层载波多普勒组合量,估算星载钟的相对频偏,并以此评估其稳定度特性。利用北斗观测数据对该方法进行有效性验证,并与通常的精密定轨与时间同步算法(ODTS法)以及平滑广播星历方法(SBE法)进行对比,最后,给出利用该方法对目前在轨的所有14颗北斗卫星(截止至2012-12)星载钟短稳的评估结果:6×10-12(τ=1 s),1×10-12(τ=10 s),4×10-13(τ=100 s)和2×10-13(τ=1 000 s)。该方法与这2种算法的结果一致,10 000 s平滑间隔内相对误差小于10%,三频组合相比单频评估精度大幅度提高,以较简单的方法实现了与复杂算法相当的精度。
[Abstract]:In view of the fact that the Beidou system does not have an open precision clock differential product at present, ordinary users are unable to obtain accurate short-term stability parameters of satellite clocks. A relatively easy method for evaluating the short-stability of spaceborne clock in Beidou system is presented. Based on the observation data of a single-station receiver, a three-frequency ionospheric carrier Doppler combination is constructed to estimate the relative frequency offset of the space-borne clock. The method is validated by Beidou observation data and compared with the conventional precise orbit determination and time synchronization algorithm (OODTS) and the smooth broadcast ephemeris (SBE). This method is used to evaluate the shortness and stability of all 14 Beidou satellites in orbit (as of 2012-12). The results show that: 6 脳 10 ~ (-12) (蟿 ~ (1) s ~ (-1)) (蟿 ~ (10) s ~ (-1)) 1 脳 10 ~ (-12) (蟿 ~ 10 ~ (-13)) and 2 脳 10 ~ (-13) (蟿 ~ (10) ~ (13)) (蟿 ~ (1 000) s) are consistent with the results of these two algorithms for the relative error in the smooth interval of 10 000 s. Less than 10, compared with the single frequency combination, the accuracy of the three-frequency combination is greatly improved. The precision of the complex algorithm is achieved by a simple method.
【作者单位】：国防科技大学电子科学与工程学院;
【基金】：新世纪优秀人才支持计划(NCET-08-0144)
【分类号】：TN967.1

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