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Communication and Ranging System for the Kepler Laboratory Demonstration

Wolf, Raphael and Surof, Janis and Poliak, Juraj and Blümel, Ludwig and Agazzi, Laura and Mata Calvo, Ramon (2020) Communication and Ranging System for the Kepler Laboratory Demonstration. In: Proceedings of the 33rd International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2020. ION GNSS+ 2020 Virtual, 2020-09-22 - 2020-09-25, USA. doi: 10.33012/2020.17615. ISBN 978-093640626-8.

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Introducing optical inter-satellite links in a global navigation satellite system enhances orbit determination and offer frequency synchronization across the constellation. To show proof-of-concept and system capabilities a laboratory demonstrator has been developed and first tests in laboratory environment have been taken out. The demonstrator is buildup of two reciprocal units interconnected via bi-directional free-space optical links. Each unit is composed of opto-mechanical terminal, optical communication system and digital signal processing implemented on a field programmable gate array. Ranging and time transfer is realized utilizing a 25.55 Gigachip-per-second binary phase shift keying modulation scheme. Correlating the received ranging sequence with a local generated reference, pseudo range determination within the order of 100 µm accuracy is achieved. In addition, a 50 Megabit-persecond data signal is multiplexed onto the ranging sequence for exchanging satellite and time information as well as user data. Frequency transfer is realized using a cavity stabilized laser as carrier transferring its stability onto the phase locked local oscillator at the receiver side. Global synchronization at system level is achieved by means of synchronizing the optical carrier and spread sequence to a highly stable clock reference as well precise ranging and information distributed through the data channel. Using onsatellite ultra-stable optical oscillator and a frequency comb for radio frequency reference generation short-term frequency stability in the order of 10-15 s/s (Allan deviation at 1 s gate time) is achieved. The aim of this paper is to show the current status of the laboratory demonstrator development and present first measurements of the entirely setup system. A general overview of the digital signal processing is given and data transmission as well as time transfer are discussed in particular. The laboratory demonstrator setup and mechanical construction is presented. Clock stability transfer between high-accuracy radio frequency reference and the digital signal processing system is shown. Further, optical frequency transfer experiments are performed demonstrating successful synchronization between laboratories.

Item URL in elib:https://elib.dlr.de/143038/
Document Type:Conference or Workshop Item (Speech)
Title:Communication and Ranging System for the Kepler Laboratory Demonstration
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wolf, RaphaelUNSPECIFIEDhttps://orcid.org/0009-0001-2170-4344UNSPECIFIED
Surof, JanisUNSPECIFIEDhttps://orcid.org/0009-0004-5356-400X138873476
Poliak, JurajUNSPECIFIEDhttps://orcid.org/0000-0002-6599-3117UNSPECIFIED
Mata Calvo, RamonUNSPECIFIEDhttps://orcid.org/0000-0001-7120-8026UNSPECIFIED
Date:24 September 2020
Journal or Publication Title:Proceedings of the 33rd International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2020
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:GNSS, global navigation satellite system, OISL, optical inter-satellite links, FSO, free-space optical links, FPGA, field programmable gate array, range, ranging, time transfer, pseudo range, cavity, laser, ultra-stable clock reference, laboratory demonstrator, digital signal processing, clock stability
Event Title:ION GNSS+ 2020 Virtual
Event Location:USA
Event Type:international Conference
Event Start Date:22 September 2020
Event End Date:25 September 2020
Organizer:The Institute of Navigation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation
Institute of Communication and Navigation > Digital Networks
Institute of Communication and Navigation > Navigation
Galileo Competence Center
Deposited By: Wolf, Raphael
Deposited On:09 Jul 2021 16:51
Last Modified:24 Apr 2024 20:42

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