### 导航脉冲星星历表参考统一性研究

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

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.