Inter-satellite communication and ranging link assignment for navigation satellite systems

Sun, Liping; Wang, Yueke; Huang, Wende; Yang, Jun; Zhou, Yifan; Yang, Dingxin

doi:10.1007/s10291-018-0704-3

Cited by 51 publications

(31 citation statements)

References 10 publications

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“…Since the links between satellite nodes are the basis for inter-satellite operations. The more inter-satellite links satellite nodes have, the more services they can undertake [29,30]. The functionality of the DSAM method is demonstrated from the perspective of satellite operations.…”

Section: Functional Analysis Of Dsam Modelmentioning

confidence: 99%

Evaluation Method of Node Importance in Temporal Satellite Networks Based on Time Slot Correlation

et al. 2021

Preprint

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Temporal satellite networks can accurately describe the dynamic process of satellite networks by considering the interaction relationship and interaction sequence between satellite nodes. In addition, the measurement of node importance in satellite networks plays a crucial role in understanding the structure and function of the network. The classical supra-adjacency matrix (SAM) temporal model identifies the key nodes in the temporal network to some extent, which ignores the differences of inter-layer connectivity relationships leading to the inability to reflect the dynamic variations of satellite nodes. Therefore, the evaluation method based on time slot correlation is proposed to measure the importance of satellite nodes in this paper. Firstly, the correlation coefficient of time slot nodes is defined to measure the coupling relationship of adjacent time slots. Secondly, the dynamic supra-adjacency matrix (DSAM) temporal network model is proposed considering the correlation between adjacent time slots and the characteristics of link time. Finally, the node importance ranking results in each time slot and a global perspective are obtained by utilizing the eigenvector centrality. Through experimental simulations of the Iridium and Orbcomm constellations, it is demonstrated that the DSAM method has a more accurate recognition rate and is more stable than the SAM method.

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Section: Functional Analysis Of Dsam Modelmentioning

confidence: 99%

Evaluation Method of Node Importance in Temporal Satellite Networks Based on Time Slot Correlation

et al. 2021

Preprint

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“…The concept of ISL exploitation was first proposed to support autonomous satellite navigation in Global Positioning System (GPS). It provided a possibility for satellites to self-navigate by using data exchanged with other satellites (Ananda et al 1990;Huang et al 2019;Sun et al 2018;Tang et al 2018;Xu et al 2012;Zhou et al 2018). GPS started introducing technology similar to ISLs in 1997 and used an ultra-high frequency (UHF) with Time Division Multiple Access (TDMA) scheme in Block IIR series.…”

Section: Introductionmentioning

confidence: 99%

The application of inter-satellite links connectivity schemes in various satellite navigation systems for orbit and clock corrections determination: simulation study

2020

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Inter-Satellite Links (ISLs) are intended to improve precision of orbit determination and satellite clock estimation. The ISLs provide a precise pseudorange measurements between satellites in a specific constellation. The study is a preparatory assessment of exploitation of seven connectivity schemes in the terms of the precise orbit determination for three types of constellations—Galileo-like with 24 satellites on three orbital planes, GPS-like with 24 satellites on six orbital planes, and GPS with real positions. The first part of the study focused on detailed analysis of the various ISL connectivity schemes, considering the geometry of ISL observations. The selected results of ranging were examined in the context of the precise orbit determination based on weighted least squares adjustment. The second part of the analysis was based on simulated measurements with two approaches. First approach focuses on geometrical dependencies and the second is performed with ISL measurement biases estimation. It was found that the use of the ISL technique with GNSS measurements in orbit determination improves the results by reducing the RMS error in the along-track and cross-track components. Choice of connectivity schemes does not have a significant impact on the total results of orbit determination, but give different contribution to particular components. Introducing constant bias in ISL measurements occurs in slightly worse estimation results. However, the relations between connectivity schemes is very similar to approach without simulation of ISL bias, the differences are at the level of 10%. Satellite and station clock estimation errors are almost equal for all used connectivity schemes. Results of clocks are also not influenced by ISL bias. This study showed that the ISL technique is a highly promising addition for future generations of satellite navigation systems and that sequential and ring connectivity schemes can be recommended for use in future navigation constellations.

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“…With the ultimate purpose of autonomous operation, the new generation of GNSS has been equipped or is planning to be equipped with inter-satellite links (ISLs) that implement inter-satellite ranging and communication [5]. To mitigate the spatial limitations of regional monitor networks, BeiDou ISLs have been used for time transfer from stations to overseas satellites.…”

Section: Introductionmentioning

confidence: 99%

Joint Timekeeping of Navigation Satellite Constellation with Inter-Satellite Links

Sun

Huang

Gao

et al. 2020

Sensors

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As a system of ranging and positioning based on time transfer, the timekeeping ability of a navigation satellite constellation is a key factor for accurate positioning and timing services. As the timekeeping performances depend on the frequency stability and predictability of satellite clocks, we propose a method to establish a more stable and predictable space time reference, i.e., inter-satellite link time (ISLT), uniting the satellite clocks through inter-satellite links (ISLs). The joint timekeeping framework is introduced first. Based on the weighted average timescale algorithm, the optimal weights that minimize the increment of the ISLT timescale are determined and allocated to the clock ensemble to improve the frequency stability and predictability in both the long and short term. The time deviations with respect to the system time of nine BeiDou-3 satellites through multi-satellite precise orbit determination (MPOD) are used for joint timekeeping evaluation. According to the Allan deviation, the frequency of the ISLT is more stable than the nine satellite clocks in the short term (averaging time smaller than 7000 s), and its daily stability can reach 6 × 10 −15 . Meanwhile, the short-term (two hours) and long-term (10 h) prediction accuracy of the ISLT is 0.18 and 1.05 ns, respectively, also better than each satellite clock. Furthermore, the joint timekeeping is verified to be robust against single-satellite malfunction.

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Inter-satellite communication and ranging link assignment for navigation satellite systems

Cited by 51 publications

References 10 publications

Evaluation Method of Node Importance in Temporal Satellite Networks Based on Time Slot Correlation

Evaluation Method of Node Importance in Temporal Satellite Networks Based on Time Slot Correlation

The application of inter-satellite links connectivity schemes in various satellite navigation systems for orbit and clock corrections determination: simulation study

Joint Timekeeping of Navigation Satellite Constellation with Inter-Satellite Links

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