ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Unity of pulsar-based ephemeris time-space reference systems for navigation
Received date: 2021-10-28
Revised date: 2021-12-23
Accepted date: 2022-03-15
Online published: 2022-03-22
Supported by
National Natural Science Foundation of China(11873050);National SKA Program of China(2020SKA0120103);Young Scholars Western China(XAB2021YN27)
Pulsars have remarkable regularity of rotation， and a high-precision time-space reference constructed from a group of pulsars ephemeris with a unified reference system can realize autonomous navigation for aircraft. At present， the navigation pulsar ephemeris under unified reference system have not been given through observation in China， and the internationally published ephemeris with different reference system cannot directly construct a time space reference， which will affects China's recent pulsar navigation experiments. In the absence of original timing observation data， the pulsar ephemeris is fitted with a new reference system by using the simulated timing observation data to realize the unification of the reference system of a group of navigation pulsar ephemeris. Finally， the accuracy of ephemeris conversion based on this method is analyzed. When the ephemeris reference is converted from DE200 to DE436， the maximum deviation of the pulsar TOA prediction within one year is reduced from 86.6 to 2.3 μs， and the TOA prediction values change from 0.326 to 0.062 μs within one year as the reference time is converted from TT （TAI） to TT （BIPM15）. Based on the software transform plug-in in TEMPO2， the ephemeris can be accurately converted under different reference coordinates， and the conversion error is less than 6 ns， which can be ignored. The TOA prediction value is reduced to 0.047 μs within one year as the reference system is converted from DE421/TT（TAI）/TDB to DE436/TT（BIPM15）/TCB.
Chengshi ZHAO , Yuping GAO , Minglei TONG , Xingzhi ZHU , Jintao LUO . Unity of pulsar-based ephemeris time-space reference systems for navigation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(3) : 526580 -526580 . DOI: 10.7527/S1000-6893.2022.26580
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