Method for implementing orbit determination and time synchronization of Beidou satellite III

Abstract

The invention discloses a method for implementing orbit determination and time synchronization of a Beidou satellite III by utilizing an inter-satellite link and an anchorage station, and belongs to the field of satellite navigation. According to the method, orbit determination and time synchronization are simultaneously implemented by utilizing data of the inter-satellite link and the anchorage station, a ground monitoring station is not required, and the Beidou satellite III can get rid of dependence on the monitoring station and implements autonomous navigation; in the data processing process, epoch naturalization does not need to be carried out, and thus, orbit information does not need to be predicted, and if satellite clock error non-zero-order item coefficients are simultaneously solved or ignored, clock error information also does not need to be predicted; only unidirectional pseudo-range data is required, bidirectional data pairing is not required, and a data utilization rateis high; and a satellite orbit and a clock error are simultaneously solved, statistical optimal solutions can be obtained, and the orbit and the clock error have better self-consistency.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and in particular relates to a method for realizing orbit determination and time synchronization of Beidou No. 3 satellites by using inter-satellite links and anchor stations. Background technique [0002] As we all know, global or regional navigation satellite systems (such as GPS, Galileo, GLONASS, BDS-2 / 3, QZSS, etc.) consist of an operation control center deployed on the ground, monitoring stations and several satellites operating in earth orbit. Common navigation satellite orbits include MEO (altitude about 20,000km), GEO and IGSO (altitude about 36,000km) orbits, and orbits at other altitudes are also possible. Each of the satellites is equipped with a highly stable atomic clock and a navigation signal device that sends a positioning signal to the user. The positioning signal includes a ranging code, a carrier wave, and a navigation message that the user can measure. The user receiver c...

AI Technical Summary

Problems solved by technology

The above-mentioned known methods have obvious deficiencies: 1) two-way one-way pseudo-range is required, and the data utilization rate in practical applications is low; 2) the self-consistency of the orbit and clock error is poor; 3) the data processing process is cumbersome, especially two-way data pairing is required Decoupled from clock difference information

4) The normalized pseudoranges and the clock-free or geometric-free combined observations obtained from them are linearly correlated, but their correlations are ignored in the actual processing

5) The anchor station data does not play a role in time synchronization. The inter-satellite link needs joint satellite-ground two-way time-frequency comparison (TWSTFT) data to perform time synchronization of Beidou-3 satellites

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