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GeReLEO-MODULOS - A Versatile LEO-Modem for Data Relay Satellite Systems

Katona, Zoltán and Aust, Thomas and Donner, Anton and Bischl, Hermann and Brandt, Hartmut (2016) GeReLEO-MODULOS - A Versatile LEO-Modem for Data Relay Satellite Systems. In: ESA Workshop on Advanced Flexible Telecom Payloads. 3rd ESA Workshop on Advanced Flexible Telecom Payloads, 21.-24. Mar. 2016, Noordwijk, The Netherlands.

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Earth observation satellites – typically low Earth orbit (LEO) satellites – require both data links for telemetry, tracking and command, and for download of mission data. Maintaining a contact to a passing LEO satellite for more than half of its orbit is possible with geostationary Earth orbit (GEO) satellites using suitable antennas onboard. Main objective of the GeReLEO-MODULOS project is to develop an engineering model of a modem for LEO satellites, which supports both bidirectional telemetry/telecommand (TM/TC) and unidirectional high-rate download of data via a GEO relay satellite. Key features of the modem are (i) support of several LEO satellites at the same time, and (ii) both high/low rata data transmission to/from big and small (inexpensive) LEO satellites. The software/firmware for the physical layer and for the higher layer protocols including interface(s) to the satellite bus allows flexible adaptation to missions’ needs. Apart from size and power consumption, bandwidth efficiency is an important requirement. Because of the timevariant free space loss on the inter-satellite link, varying antenna gain caused by relative movement between LEO and GEO, and due to changing atmospheric conditions on the feeder link the modem supports different modulation and coding (ModCod) schemes. Switching between ModCod schemes is either triggered via the return channel, or is determined by a pre-computed deterministic pattern. The modem hardware consists mainly of Ka-band up/down-converters and a Zynq-7000 XC7Z045 all programmable (AP) system on a chip (SoC). This SoC integrates a processing system (PS) containing two ARM c CortexTM-A9 MPCoreTM application processors, and a programmable logic (PL) for high performance applications. The former is used for the higher layer protocol implementation; the latter takes care of the digital signal processing and the physical layer. In this paper we will introduce the GeReLEO-MODULOS hardware and software concept. The chosen SoC approach allows both efficient modem software development and high-rate data transmission.

Item URL in elib:https://elib.dlr.de/103692/
Document Type:Conference or Workshop Item (Speech)
Title:GeReLEO-MODULOS - A Versatile LEO-Modem for Data Relay Satellite Systems
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Katona, ZoltánZoltan.Katona (at) dlr.deUNSPECIFIED
Aust, ThomasSteinbeis Innovationszentrum RaumfahrtUNSPECIFIED
Donner, AntonAnton.Donner (at) dlr.deUNSPECIFIED
Bischl, HermannHermann.Bischl (at) dlr.deUNSPECIFIED
Brandt, HartmutHartmut.Brandt (at) dlr.deUNSPECIFIED
Date:March 2016
Journal or Publication Title:ESA Workshop on Advanced Flexible Telecom Payloads
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:low earth orbit satellite; geostationary earth orbit; data relay; modem; adaptive Modulation and coding
Event Title:3rd ESA Workshop on Advanced Flexible Telecom Payloads
Event Location:Noordwijk, The Netherlands
Event Type:international Conference
Event Dates:21.-24. Mar. 2016
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 > Satellite Networks
Deposited By: Donner, Anton
Deposited On:26 Apr 2016 17:10
Last Modified:31 Jul 2019 20:00

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