Application of an optical data link on DLR s BIROS satellite
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1 Chart 1 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Application of an optical data link on DLR s BIROS satellite Martin Brechtelsbauer, Christopher Schmidt, Peter Becker, Christian Fuchs Institute of Communications and Navigation Satellite Networks Department Optical Communication Systems Group DLR Oberpfaffenhofen
2 Chart 2 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Contents - OSIRIS Space Segment - Ground Segment - Measurements / Optical Ground Station Diversity - Throughput Estimation for OSIRIS on BIROS
3 Chart 3 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Contents - OSIRIS Space Segment - Ground Segment - Measurements / Optical Ground Station Diversity - Throughput Estimation for OSIRIS on BIROS
4 Chart 4 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation OSIRIS Background and Motivation - Experimental optical communication system for small satellites - Optimization regarding SWaP (Size, Weight and Power), Modulation Scheme (Atmospheric Robustness), Costs - Scientific Value - Channel 1,5µm - Adaptive Optics Experiments - Verification of Ground Station Diversity - Qualification of Components - Limited Budget: Usage of COTS-Components - Missions: - Flying Laptop (University of Stuttgart) - BIROS (DLR)
5 Chart 5 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Operation Procedure
6 Chart 6 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation OSIRIS for BIROS - BIROS - Berlin InfraRed Optical System - Optimized for Fire Detection Applications - Data rate goals: - Downlink: 1 Gbit/s (vs. 2 Mbit/s S-Band-RF-link) - Uplink: 1 Mbit/s (vs. 4 kbit/s S-Band-RF-link) - Data processing onboard satellite due to data-link constraints Optical link enables transmission of raw data
7 Chart 7 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Components Laser Sources - Laser Sources - High Power Laser Diode (HPLD) - Erbium Doped Fiber Amplifier (EDFA) - Performance - Up to ~200 1W optical power - 30 W power consumption (during DL) - Vibration- & Thermo-Vacuum-Tests accomplished Engineering Model for Flying Laptop - In-Orbit Verification of Laser Sources onboard Flying Laptop (launch foreseen for 2014)
8 Chart 8 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Components Tracking System - Based on 4-Quadrant-Detector - Better Pointing Accuracy Better Link Budget - Integrated Uplink (up to 1 Mbit/s)
9 Chart 9 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Expected System Performance Link-Budget vs. Elevation 1 20 Elevation
10 Chart 10 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation OSIRIS for BIROS Overall Status - Accomodation on satellite finished - Design of components finished - Engineering Model currently in production - Exhaustive space qualification - Vibration - Thermal - Radiation - EMC - Launch currently foreseen for late 2014
11 Chart 11 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Contents - OSIRIS Space Segment - Ground Segment - Measurements / Optical Ground Station Diversity - Throughput Estimation for OSIRIS on BIROS
12 Chart 12 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Optical Ground Station Oberpfaffenhofen (OGS-OP) - Clamshell Dome on institute s rooftop - Coudé Room for operation and experiments Dome Container Coudé room
13 Chart 13 > Optical Communications > C. Fuchs > DLR Institute of Communications and Navigation Typical Setup of Optical Bench Focus Cam Focus Cam SH sensor PIN FPA RFE Tracking camera Pupil Cam Pupil camera
14 Chart 14 > Optical Communications > C. Fuchs > DLR Institute of Communications and Navigation Transportable Optical Ground Station (TOGS) - 60 cm aluminum mirror (Manufactured at DLR and with partners) - Usage of hollow-shaft torque motors (Initially developed at the Institute for Robotics and Mechatronics) - Receiver, Beacon System, Tracking Camera and Computer System integrated behind telescope - Absolute encoders with sub-µrad resolution - Eye-safe dimensioning
15 Chart 15 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Contents - OSIRIS Space Segment - Ground Segment - Measurements / Optical Ground Station Diversity - Throughput Estimation for OSIRIS on BIROS
16 Chart 16 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation KIODO Kirari Optical Downlinks to Oberpfaffenhofen - Cooperation between DLR and JAXA/NICT - Campaigns in 2006 & Measurements of Channel Behaviour - Wavelengths: ~800nm (Beacon & Communication)
17 Chart 17 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Example DL-Results: Received Power & BER (KIODO-LEO-Downlinks to Oberpfaffenhofen) Fades are characteristic to satellite
18 Chart 18 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Further Results - Power Meter: Fading statistics of LEO Downlink - Fractional fade time - Mean fade length - Fade number per unit time
19 Chart 19 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Major Challenge: Link-Blockage by Clouds Optical Ground Station Diversity - Example: 4 Optical Ground Stations (OGS) in Germany Combined Availability: - Summer: 91% - Winter: 73% - European OGS-Network: >98% annual availability (5 Stations) OGS-Locations in Germany - Worldwide OGS-Networks allow availabilities over 99% European and Worldwide OGS-Locations red/yellow: areas with low/high cloud probability
20 Chart 20 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Contents - OSIRIS Space Segment - Ground Segment - Laser Safety Assessment - Throughput Estimation for OSIRIS on BIROS
21 Chart 21 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation (Simple) estimation of throughput for OSIRIS on BIROS - Simulation of all satellite-contacts to selected ground stations - Consideration of OGS-Availability (yearly average) - S-Band Link as reference - Several OGS-networks considered - Oberpfaffenhofen alone - Oberpfaffenhofen + Neustrelitz - Oberpfaffenhofen + Adelaide - Oberpfaffenhofen + Tenerife
22 Chart 22 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Theoretical throughput for different OGS-networks Optical: > 200 Gbit/Day S-Band: ~ 4 Gbit/Day
23 Chart 23 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Theoretical throughput for different OGS-networks (yearly average per day) Data link Min. Ground Combined Data througput Elevation Stations Availability (yearly average) [ ] [Gbit] Optical, 1 Gbit/s 20 OP 34 % 200 Optical, 1 Gbit/s 20 OP + NZ 54 % 300 Optical, 1 Gbit/s 20 OP + Adelaide 67 % 700 Optical, 1 Gbit/s 20 OP + Teneriffa 81 % 800 S-Band, 2 Mbit/s 5 OP 100 % 4 OP Oberpfaffenhofen NZ Neustrelitz
24 Chart 24 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Conclusions - DLR develops an experimental optical communications payload for application on BIROS - Ground segments for scientific measurements as well as pre-operational applications are available - Requirements for operational use of optical links - Optimized coding with long influence length - OGS-Diversity - Satellite missions can strongly benefit from optical communications, even if availability is limited
25 Chart 25 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Thank you very much for your attention!
26 Chart 26 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Backup
27 Chart 27 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation Laser Safety Assessment at ground segment - Requirement: Eye-Safe Operation of Ground Stations - Laser Safety Assessment according to DIN EN NOHD: Nominal Ocular Hazard Distance - NSHD: Nominal Skin Hazard Distance 1550) - P: Power - MPE: Maximum Permittable Exposure 1550: 1000 W/m² (10s and longer), 10 kw/m² (1s) - d: aperture - : Divergence
28 Chart 28 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation NOHD vs. Power (Assuming 5cm aperture, infinite exposure) ~13 5 mrad, 5 W
29 Chart 29 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation NOHD vs. Aperture (Assuming 5mrad divergence, infinite exposure) ~12 5 W
30 Chart 30 > SpaceOps > C. Fuchs > DLR Institute of Communications and Navigation NOHD vs. Aperture (Assuming 5mrad divergence, 1s exposure) ~3.5 5 mrad, 5 W
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