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导航脉冲星星历表参考统一性研究

赵成仕,高玉平,童明雷,朱幸芝,罗近涛   

  1. 中国科学院国家授时中心
  • 收稿日期:2021-10-29 修回日期:2022-03-17 出版日期:2022-03-22 发布日期:2022-03-22
  • 通讯作者: 赵成仕
  • 基金资助:
    国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;科技部SKA专项

Study on the Unity of Pulsar-based Ephemeris Reference for Navigation

  • Received:2021-10-29 Revised:2022-03-17 Online:2022-03-22 Published:2022-03-22
  • Contact: Cheng-Shi ZHAO

摘要: 脉冲星具有很高自转稳定性,基于一组脉冲星星历表构建的高精度时空基准,可实现对飞行器自主导航。脉冲星星历表的测量是在某一给定参考组合下,参考类型主要包括:时间基准、太阳系行星历表和坐标时。不同参考下建立的星历表参数值差异很大,在利用脉冲星对飞行器定位时,需要在一组统一参考下的脉冲星。本文首先利用射电计时观测数据分析不同参考对脉冲星计时残差及星历表参数值的影响。其中,DE200相对于DE421下构建的星历表参数值间偏差比参数值拟合误差大3个量级,参考时间基准TT(TAI)与TT(BIPM)下获得的自转参数值间偏差为7.7E-13,比参数值拟合误差大2个量级。本文最后提出一种在没有原始计时观测数据情况下,不同参考下脉冲星星历表转换方法,并通过与实测星历表比较分析参数值转换精度。其中DE200转换为DE421后,脉冲星TOA一年内预报值最大偏差由103.55μs减小为1.2μs。TT(TAI)转换为TT(BIPM13)后,TOA一年内预报值最大偏差由0.135μs减小为0.016μs。不同参考坐标时下星历表可精准转换,转换误差可忽略不计。

关键词: 脉冲星导航, 脉冲星星历表, 参考, 残差, 计时

Abstract: Pulsars have remarkable regularity of rotation, and a high-precision time-space reference referenced to the ephemeris constructed by a group of Pulsars can realize autonomous navigation for aircraft. The measurement of the pulsar ephemeris is based on a given reference combination, and the reference types mainly include: time reference, solar-system planetary ephemeris and coordinate time. The ephemeris parameters established under different references vary greatly, it is necessary to use a group of pulsars under unified reference when using pulsar for aircraft positioning. This paper uses radio timing observation data to analyze the influence of different references on timing residuals and ephemeris parameters. It is worth mentioning that the deviation between the ephemeris parameters referenced to DE200 and DE421 is 3 orders of magnitude larger than the fitting error of the parameters, and the deviation between the rotation parameters obtained under the reference time TT (TAI) and TT (BIPM) is 7.7E-13, which is 2 orders of magnitude larger than the fitting error of the parameter. Finally, this paper provides a method for converting pulsar ephemeris under different references without the original timing observation data, and analyzes the conversion accuracy of parameter by comparing with the real measured ephemeris. When the ephemeris reference is converted from DE200 to DE421, the maximum deviation of the pulsar TOA prediction within one year is reduced from 103.55μs to 1.2μs, and the TOA prediction values change from 0.135μs to 0.016μs within one year as the reference time is converted from TT (TAI) to TT (BIPM13).The ephemeris can be accurately converted under different reference coordinates with ignored error.

Key words: pulsar navigation, pulsar ephemeris, reference, residual, timing

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