Validation of Kepler Time and Frequency Transfer on a Terrestrial Range of 10.45km

Surof, Janis; Poliak, Juraj; Wolf, Raphael; Macri, Luca; Calvo, Ramon Mata; Blümel, Ludwig; Domínguez, Pablo Álvarez; Giorgi, Gabriele; Agazzi, L.; Furthner, Johann; Günther, Christoph

doi:10.33012/2022.18480

Cited by 9 publications

(6 citation statements)

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“…The ranging is implemented with a spreading sequence that enables sub-mm ranging accuracy, whilst the communications signal, multiplexed at a lower data rate, is used to exchange satellite and clock information as described in more detail in. 10 These are multiplexed together and modulated coherently onto the optical carrier before being sent to the receiver, as shown in the Figure 1. At the receiver end, the incoming combined signal is interfered with a local oscillator (LO) which is also modulated by a reference ranging sequence.…”

Section: Time-transfermentioning

confidence: 99%

Photonic integrated circuits for high-throughput optical communications and ranging satellite links

Ziarko,

Terrasanta,

Bergamasco

et al. 2024

Free-Space Laser Communications XXXVI

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Photonic Integrated Circuits (PICs) are one of the key technologies enabling extremely high-throughput optical communications systems deployed in terrestrial fibre networks. Their inherent benefit is the co-integration and miniaturization of multiple high-speed optical devices such as lasers, photodiodes and modulators on a single chip. Compact photonic solutions have the potential to benefit satellite systems not only in terms of their demonstrated performance, but also through improvements in Size, Weight and Power (SWaP) of a satellite payload.In our approach we propose leveraging mature PIC-based solutions employed in high-speed coherent transceivers delivering 100 Gbps per wavelength using PDM-QPSK modulation format. However, the optical chip design is adapted to expand its functionality with a capability to correlate time-transfer sequences used for satellite ranging applications.The proposed solution is demonstrated with a simplified Indium Phosphide transceiver chip operating in the optical C-band. The required functionality of the current prototype is based on a combination of standard and customized integrated devices. The adaptation of the required photonic components accounts for existing reports on the space environment impact on their performances. The implemented functionalities are tested to prove the concept feasibility and gain better understanding of their performance.

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Section: Time-transfermentioning

confidence: 99%

Photonic integrated circuits for high-throughput optical communications and ranging satellite links

Ziarko,

Terrasanta,

Bergamasco

et al. 2024

Free-Space Laser Communications XXXVI

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“…This is crucial to support future GNSS by means of optical inter-satellite links. Developments are focusing on prototyping and architecture validation [26] as well development of electronics, FW and SW for missions, e.g. COMPASSO [27].…”

Section: Optical Technologies For Satellite Linksmentioning

confidence: 99%

Optical satellite links at DLR

Fuchs

Moll

Poliak

et al. 2023

Free-Space Laser Communications XXXV

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Free-Space Optical Communications have gained increasing attention throughout the last years. It is intended to use optical links in a large number of application scenarios, such as communications or navigation. The Optical Satellite Links department at the German Aerospace Center's Institute of Communications and Navigation looks back to a heritage in free-space optical communication systems research of more than two decades. The researched topics include applications such as optical communications from the satellites to Earth and between satellites, development of optical ground stations, design of optimized adaptive optics systems, quantum key distribution systems, technologies for optical time-transfer and ranging, among others. This paper will give an overview of recent research activities carried out in the Optical Satellite Links department, and will give an outlook to future developments which are planned.

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“…For all scenarios we consider the nominal case in which the differential clock measurements are only affected by zero-mean Gaussian noise, with standard deviation of either 0.3 ps or 3 ps. The lower noise level corresponds to the achievable link precision demonstrated experimentally (Surof et al, 2019;Calvo et al, 2020, Surof et al, 2022, while higher noise level considers possible unmodelled effects. In the two full Kepler scenarios, we assume that the measurements between clocks onboard the same LEO satellite are affected by noise with standard deviation of 1fs.…”

Section: Simulation Scenariosmentioning

confidence: 99%

“…With spacecrafts pair-wise connected with two-way coherent laser links, coherent transceivers allow the generation and reception of timestamps with sub-picosecond precision, enabling the exchange of measured time-of-arrival information between the paired satellites. Two-Way Time Transfer (TWTT) methods make it possible to retrieve clock offsets with picosecond-level accuracy (Poliak et al 2018;Calvo et al 2020;Surof et al 2019Surof et al ,2022. All the relative clock offsets are then distributed through the whole constellation and used as input of the synchronization algorithm based on the concept of clock ensembling, where each satellite generates a local copy of the ensemble time.…”

Section: Introductionmentioning

confidence: 99%

Autonomous Satellite System Synchronization Schemes via Optical Two-Way Time Transfer and Distributed Composite Clock

Trainotti¹,

Dassié²,

Giorgi³

et al. 2022

ION GNSS+, the International Technical Meeting of the Satellite Division of the Institute of Navigation

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and a M.Sc. in mechatronic engineering from the University of Trento, Italy. Since 2018 he works at the Institute of Communications and Navigation at the German Aerospace Center (DLR) on precise and robust time generation for GNSS applications.Manuele Dassié holds a B.Sc in Physics from the University of Fribourg, Switzerland and a M.Sc in Aerospace Engineering from Institut Supérieur de l'Aéronautique et de l'Espace in Toulouse, France. Currently, Manuele is working on the synchronization of satellites at system level and on the implementation of a GNSS simulator, at the DLR-KN Institute.

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Validation of Kepler Time and Frequency Transfer on a Terrestrial Range of 10.45km

Cited by 9 publications

References 0 publications

Photonic integrated circuits for high-throughput optical communications and ranging satellite links

Photonic integrated circuits for high-throughput optical communications and ranging satellite links

Optical satellite links at DLR

Autonomous Satellite System Synchronization Schemes via Optical Two-Way Time Transfer and Distributed Composite Clock

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