Inter-satellite links for satellite autonomous integrity monitoring

Rodríguez-Pérez, Irma; García-Serrano, Cristina; Catalan, C.; Garcia, A.; Tavella, P.; Galleani, Lorenzo; Amarillo, F.

doi:10.1016/j.asr.2010.07.019

Cited by 29 publications

(11 citation statements)

References 3 publications

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“…Hence starting from Block IIR, GPS adopts inter-satellite links combined with the polling time division duplex scheme (PTDD) to achieve autonomous time synchronization in cases where the ground station is not available [ 9 , 10 ]. Similar discussions about other GNSS systems could be found in [ 11 , 12 ], although these are not actually being implemented yet. In addition, some other scientific-based space missions are also being deployed, In [ 13 ], a method based on asynchronous two way time-stamping exchange is being employed, where the clock skews and clock offsets are estimated but not adjusted.…”

Section: Introductionmentioning

confidence: 53%

An Autonomous Satellite Time Synchronization System Using Remotely Disciplined VC-OCXOs

Chang

Glennon

et al. 2015

Sensors

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An autonomous remote clock control system is proposed to provide time synchronization and frequency syntonization for satellite to satellite or ground to satellite time transfer, with the system comprising on-board voltage controlled oven controlled crystal oscillators (VC-OCXOs) that are disciplined to a remote master atomic clock or oscillator. The synchronization loop aims to provide autonomous operation over extended periods, be widely applicable to a variety of scenarios and robust. A new architecture comprising the use of frequency division duplex (FDD), synchronous time division (STDD) duplex and code division multiple access (CDMA) with a centralized topology is employed. This new design utilizes dual one-way ranging methods to precisely measure the clock error, adopts least square (LS) methods to predict the clock error and employs a third-order phase lock loop (PLL) to generate the voltage control signal. A general functional model for this system is proposed and the error sources and delays that affect the time synchronization are discussed. Related algorithms for estimating and correcting these errors are also proposed. The performance of the proposed system is simulated and guidance for selecting the clock is provided.

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Section: Introductionmentioning

confidence: 53%

An Autonomous Satellite Time Synchronization System Using Remotely Disciplined VC-OCXOs

Chang

Glennon

et al. 2015

Sensors

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“…3d). The fourth group consists of observation scenarios based on the a priori defined sequence of pairs (Fernández 2011;Rodríguez-Pérez et al 2011). It was modified for application to a constellation with an even number of satellites (Monika Stetter, Technical University of Munich, personal communication).…”

Section: Connectivity Schemesmentioning

confidence: 99%

“…Connections between satellites can be used to transfer information, which might shorten the ephemeris update interval and improve navigation (Gong et al 2019). One of the advantages of the ISL system is the potential to establish links outside of the atmosphere, and thus the ISL measurements are not affected by atmospheric delays and they are also less impacted by multipath and interference than GNSS measurements (Rodríguez-Pérez et al 2011). It has also been suggested that satellites could determine their orbit autonomously by processing ISL measurements (Xu et al 2012).…”

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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“…Rodríguez-Pérez et al. 14 obtained appropriate observables for both satellite orbits and clock monitoring by a linear combination of the inter-satellite links observables. Fakoor et al.…”

Section: Introductionmentioning

confidence: 99%

“…Alagha 13 enabled more than one ground user to obtain the satellite signal by dividing the central beam into several nonoverlapping zones. Rodrı´guez-Pe´rez et al 14 obtained appropriate observables for both satellite orbits and clock monitoring by a linear combination of the inter-satellite links observables. Fakoor et al 15 established a communication link between the satellites utilizing analytical solution for the relative motion of satellites with respect to the reference trajectory.…”

Section: Introductionmentioning

confidence: 99%

Occasion determination method of low Earth orbit satellites meeting the narrow-beam signal

Rui

2018

Proceedings of the Institution of Mechanical Engineers, Part G:

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The determination of the occasion when the low Earth orbit satellite meets the narrow-beam signal is quite important. Based on the orbit prediction model of simplified general perturbations 4 (SGP4), the calculation model of the relative position between the low Earth orbit satellite and the ground target is established in the paper, and so is the calculation model of the relative position between the low Earth orbit satellite and the high Earth orbit communication satellite. The determination method of the occasion when the low Earth orbit satellite meets the narrow-beam signal is further proposed. It is shown by the simulation results that the proposed calculation method possesses high accuracy and feasibility and is able to satisfy the practical application requirements.

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Inter-satellite links for satellite autonomous integrity monitoring

Cited by 29 publications

References 3 publications

An Autonomous Satellite Time Synchronization System Using Remotely Disciplined VC-OCXOs

An Autonomous Satellite Time Synchronization System Using Remotely Disciplined VC-OCXOs

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

Occasion determination method of low Earth orbit satellites meeting the narrow-beam signal

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