Laser communication applied for EDRS, the European data relay system

Heine, F.; Kämpfner, Hartmut; Lange, R.; Czichy, Reinhard H.; Lutzer, Michael; Meyer, Rolf

doi:10.1007/s12567-011-0015-9

Cited by 21 publications

(7 citation statements)

References 7 publications

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“…Considering the bandwidth available at Ka‐band, a Ka‐band RF downlink could legitimately be seen as a capacity bottleneck for this kind of application . Thus, the migration towards GEO to ground optical link could be envisaged to prevent this capacity limitation . As already discussed in Section 2.2, the use of Q/V‐band or W‐band could be sufficient to have enough bandwidth to forward the data acquired by the LCT without the need of frequency re‐use.…”

Section: Simulation Results and Comparisonmentioning

confidence: 99%

Capacity analysis of high‐throughput satellite links for Earth observation missions

Katona

Kourogiorgas

Panagopoulos

et al. 2015

Satell Commun Network

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Summary Earth observation missions are important for economy and science. The data collected by such satellites are used in agriculture, maritime services, disaster and environmental monitoring, and so on. Earth observation satellites are low Earth orbit (LEO) satellites typically with a sun‐synchronous, polar orbit. The amount of collected data has significantly increased over the years. This calls for finding new ways to increase the transfer rate on the satellite link. As a consequence, the present paper analyzes the possibility of moving from low to high radio frequencies. In addition, different topologies are analyzed, such as the conventional direct LEO satellite to ground station link, and the data relay link from the LEO satellite to the ground station through a geostationary Earth orbit (GEO) satellite. The present paper thus analyzes the foreseeable performance of Ka‐band and Q‐band direct links, and Ka‐band, Q‐band, and W‐band data relay links. The following channel adaptation techniques were assumed during the analysis: adaptive coding and modulation and variable coding and modulation. According to the results, the link margin is significantly high in clear sky, reaching at least 7dB, even using the least robust modulation and coding (ModCod) scheme, which applies 1024‐amplitude and phase‐shift keying (1024‐APSK) modulation scheme. As a consequence, it shall be important in the future to further increase the spectral efficiency of the link, by, for example, reducing phase noise in order to enable even higher‐order modulation schemes. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Simulation Results and Comparisonmentioning

confidence: 99%

Capacity analysis of high‐throughput satellite links for Earth observation missions

Katona

Kourogiorgas

Panagopoulos

et al. 2015

Satell Commun Network

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“…The LCTs operate at 1064 nm with a 5 W fiber laser, similar to the EDRS LCT [32], and a 250 MHz RF modulation. A telescope aperture of 150 mm in space and 300 mm on ground was chosen.…”

Section: Payloadmentioning

confidence: 99%

STE-QUEST mission and system design

Hechenblaikner¹,

Hess²,

Vitelli³

et al. 2014

Exp Astron

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STE-QUEST is a fundamental science mission which is considered for launch within the Cosmic Vision programme of the European Space Agency (ESA). Its main scientific objectives relate to probing various aspects of Einstein's theory of general relativity by measuring the gravitational red-shift of the earth, the moon and the sun as well as testing the weak equivalence principle to unprecedented accuracy. In order to perform the measurements, the system features a spacecraft equipped with two complex instruments, an atomic clock and an atom interferometer, a ground-segment encompassing several ground-terminals collocated with the best available ground atomic clocks, and clock comparison between space and ground via microwave and optical links. The baseline orbit is highly eccentric and exhibits strong variations of incident solar flux, which poses challenges for thermal and power subsystems in addition to the difficulties encountered by precise-orbit-determination at high altitudes. The mission assessment and definition phase (Phase-A) has recently been completed and this paper gives a concise overview over some system level results.

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“…The ISL can be preferably operated as an optical or laser link denoted as OISL (Optical ISL) if both LEO and GEO satellites are equipped with LCTs [6,7]. The benefits of operating the ISL as OISL are: availability of high data rates (up to 1800 Mbps net rate with current LCT technology), no need for ITU spectrum regulation, robustness against interference from other systems, and no kind of harm or interference to other systems or antennas on the same platform.…”

Section: Geo Relay Satellites and Hybrid Payloadsmentioning

confidence: 99%

“…The vibration spectra of LEO and GEO satellites are available (based on mechanical analysis) and then converted into a time-variant discrete-time model of the optical link, taking into account the pointing-tracking control-loop properties of the LCTs and all other relevant effects of optical receivers [6,7].…”

Section: Introductionmentioning

confidence: 99%

Data Processing for Broadband Relay Satellite Networks - Digital Architecture and Performance Evaluation

Friedrichs¹

2013

31st AIAA International Communications Satellite Systems Conference

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In a relay satellite network, information from LEO satellites is transmitted first over an OISL (Optical InterSatellite Link) to a GEO relay satellite and then via microwave Ka-band from the GEO relay to the GS (Ground Station). ESA and ASV (Astrium Services) have initiated the program EDRS (European Data Relay Satellite) for the development and operation of several GEO relay satellites. This paper covers the digital concepts for packet data transmission with up to 1800 Mbps in the complete network LEOGEOGS. The LEO contains a digital processing unit where the outputs of several mass memories are encapsulated into packets, error-control coding is added and finally multiplexing and frame stuffing is applied to generate a data stream for the transmission over the OISL. Another digital processing unit is located in the GEO relay, where the data stream received from the OISL is again encapsulated and packetized, encrypted, encoded, multiplexed with idle frames and split to several Ka-band DL (DownLink) channels. The performance of the network is evaluated by a combination of analytical and simulation methods.

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Laser communication applied for EDRS, the European data relay system

Cited by 21 publications

References 7 publications

Capacity analysis of high‐throughput satellite links for Earth observation missions

Capacity analysis of high‐throughput satellite links for Earth observation missions

STE-QUEST mission and system design

Data Processing for Broadband Relay Satellite Networks - Digital Architecture and Performance Evaluation

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