Common-View Time Transfer Using Geostationary Satellite

Pei, Wei; Chaozhong, Yang; Cao, Fen; Zhenyuan, Hu; Li, Zhigang; Guo, Jianwei; Li, Xiaohui; Qin, Weijin

doi:10.1109/tuffc.2020.2988492

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…Since the phase observation noise is substantially less than the pseudorange observation noise, the accuracy of the smoothed pseudorange observation is greatly improved. However, it should be noted that Equation (9) ignores the effect of the ionospheric delay error variation in the kth and k−1th epochs, resulting in a less-than-optimal smoothing effect. The classical phase-smoothed pseudorange method usually treats the ionospheric delay variation as zero, in which case, the pseudorange accuracy is not effectively improved when the ionospheric delay variation is more drastic.…”

Section: Bdgimmentioning

confidence: 99%

“…Defraigne et al [8] presented error-processing strategies and the Common GPS GLONASS Time Transfer Standard related to CV time transfer. Wei et al [9] developed a CV time transfer method using GEO satellites, and it had a time transfer performance comparable to that of TWSTFT. In addition, Zhang et al [10] analyzed the effect of ionospheric delay on CV time transfer.…”

Section: Introductionmentioning

confidence: 99%

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A BDGIM-Based Phase-Smoothed Pseudorange Algorithm for BDS-3 High-Precision Time Transfer

2022

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Single point positioning (SPP) can meet the requirements of the majority of real-time time transfer applications. Meanwhile, a single-frequency (SF) receiver is cheaper than a dual-frequency receiver. However, SPP performance can be greatly affected by large pseudorange observation noise. Phase smoothing the pseudorange is an effective approach to reduce pseudorange noise. Since the classical phase-smoothed pseudorange algorithm does not account for the effect of ionosphere delay, we propose a BDGIM-based phase-smoothed pseudorange algorithm to eliminate the ionospheric delay and apply it to BeiDou Navigation Satellite System (BDS-3) SPP time transfer. In this paper, we first evaluate the performance of the BeiDou global ionospheric delay correction model (BDGIM) and compare it with that of the BeiDou Klobuchar model to determine if it is practical to incorporate the BDGIM into our suggested method. The performance of the BDGIM is better than that of the Klobuchar model. The mean RMS value of the BDGIM is 2.6 Total Electron Content Unit (TECU). The average ionospheric correction rate of the BDGIM is 75.5%. Then, we investigate the performance of the improved SF SPP time transfer. The performance of the improved SPP time transfer is much better than that of the traditional SPP time transfer. Compared with the traditional time transfer, the average Type A uncertainty of the improved time transfer is 2.08 ns, which is reduced by about 11.1% from the time transfer without it. Regarding frequency stability, the modified Allan deviations of the improved time transfer are 1.43E-12 and 1.68E-13 at 960 s and 61,440 s, with improvements of 51.2% and 59.9%, respectively.

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Section: Bdgimmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A BDGIM-Based Phase-Smoothed Pseudorange Algorithm for BDS-3 High-Precision Time Transfer

2022

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“…GNSS time transfer methods mainly include satellite one-way time service, satellite common-view method, satellite all-in-view method, and the satellite carrier phase time transfer method [11][12][13][14], among which satellite one-way time service, the satellite commonview method, and the satellite all-in-view method are all schemes based on pseudorange observations, and the accuracy of time transfer is limited by the accuracy of the pseudorange [15]. The satellite carrier phase time transfer method is based on carrier phase observation data, which can greatly improve the accuracy and stability of time transfer compared with the pseudorange scheme [16].…”

Section: Introductionmentioning

confidence: 99%

An Interstation Undifferenced Real-Time Time Transfer Method with Refined Modeling of Receiver Clock

Lyu,

Liu,

Zhao

et al. 2023

Remote Sensing

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Due to their advantages of high measurement accuracy and wide coverage, global navigation satellite systems (GNSSs) can carry out long-distance time transfers, among which the precise point positioning (PPP) method is widely used. However, the accuracy and stability of PPP real-time time transfer are restricted by the real-time satellite clock offset products. In addition, the receiver clock offset is usually estimated using the white noise model, which ignores the correlation of the clock offsets between adjacent epochs and the stability of the atomic clock itself. In order to obtain higher performance time transfer results, we propose an interstation undifferenced time transfer method with refined modeling of the receiver clock. This method takes the satellite clock offset as the parameter to be estimated, which can avoid the influence of external satellite clock offset products. In addition, the refined modeling of the receiver clock can improve the strength of the model and the accuracy of time transfer. Based on the ultrarapid satellite orbit products provided by the International GNSS Service (IGS), time transfer experiments are carried out using data from IGS observatories and self-collected data. The results show that sub-nanosecond accuracy can be achieved in real-time time transfer using this method. Compared with the traditional PPP model, the accuracies of the four time links are increased by 88.4%, 92.9%, 88.6%, and 74.5%, respectively, and the stability is increased by approximately 66.4% on average. Moreover, after applying the clock offset constraint model, frequency stability is further improved, in which the short-term stability is improved significantly, with a maximum of 86.9% and an average improvement of approximately 66.8%.

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