LASER COMMUNICATION FOR EDRS LEO-GEO, LEO-GROUND, GEO-GROUND
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1 PIONEERING WITH PASSION LASER COMMUNICATION FOR EDRS LEO-GEO, LEO-GROUND, GEO-GROUND Robert Lange (Tesat-Spacecom) 1 PROPRIETARY INFORMATION Tesat-Spacecom GmbH & Co.KG reserves all rights including industrial property rights, and all rights of disposal Tesat-Spacecom such as copying GmbH and & passing Co.KG to 2010 third parties
2 Figure courtesy of ESA _ P. Carril PIONEERING WITH PASSION TESAT LCT Ready for Commercial Operation Applied in EDRS Increased availability 12 h per day instead of several minutes Increased data rate Up to 10 Gbps 1.8 Gbps for EDRS Figure courtesy of ESA_P. Carril Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
3 EDRS LCTs Based on Links Verified In-Orbit! NFIRE Optical inter-satellite links TerraSAR-X Inter-satellite links Space-to-ground links Ground-to-space links at data rates of Gbps Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
4 LCT: Based on Homdyne BPSK Most sensitive Highly immune against sun light Homodyne BPSK maintains the optical link even with the sun in the Field Of View! Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
5 Homodyne BPSK: Reliable Designed for lowest fit rate by laser diode redundancy Hot: Laser diode bench Cold: Redundant benches Pump Module Reliability > in 15 years Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
6 Homodyne BPSK: Robust Nd:YAG laser Frequency stability ensured by MISER principle Polarization maintaining mono-mode fiber coupled Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
7 Homodyne BPSK: Easy Handling Easy handling interface Receiver Front End performing Spatial acquisition Frequency acquisition OPLL control signals Tracking Demodulation Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
8 Homodyne BPSK: Technology Readiness Level 9 LCT operational in-orbit Verified as reliable and robust Extensive test and measurement campaigns have proven calculated link budgets to be very accurate FM lasers delivered to ESA and US aero-space industry Heritage: GIFTS, ALADIN, LISA, ATLID, several classified programs Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
9 Laser Communication Terminal: In-Orbit Verification LEO LEO Links Data Rate Gbps Range Up to 5,100 km Target Bit Error Rate 10-8 Transmit Power 0.7 W Telescope Diameter 125 mm Mass 35 kg Power Consumption ~ 120 W max. Envelope ~ 0.5 x 0.5 x 0.6 m Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
10 In-Orbit Verification: LCT Accommodated on TerraSAR LCT integrated on TerraSAR-X (LEO satellite) Launched June 14th 2007 Status: LCT fully operational Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
11 In-Orbit Verification: LCT Accommodated on NFIRE LCT integrated on NFIRE (U.S. LEO satellite) Launched April 23rd 2007 Status: LCT fully operational Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
12 In-Orbit Verification: First ISL dated Feb. 21st 2008 TerraSAR-X NFIRE Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
13 In-Orbit Verification: Inter-Satellite Link Bit errors measured in one of the 25 data channels of 225 Mbps Only one bit error measured for one of the LCTs within 400 s Bit error rate better than Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
14 In-Orbit Verification: Ground Station Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
15 In-Orbit Verification: Space-to-Ground Link Bit error rate still low, but increased due to atmospheric distortion Measurement campaign running to optimize communication link by use of adaptive optics Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
16 In-Orbit Verification: Ground-to-Space Link First link (not yet optimized!) already verifies feasibility of uplink Communication at amazing low bit error rates of 10-5 Bit error rate increase due to atmospheric disturbance Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
17 Laser Communication Terminal: Optical GEO Relay LEO GEO GEO Links Data Rate 1.8 Gbps Range Up to 45,000 km Target Bit Error Rate 10-8 Transmit Power 2.2 W Telescope Diameter 135 mm Mass 50 kg Power Consumption ~ 160 W max. Envelope ~ 0.6 x 0.6 x 0.7 m Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
18 The Optical GEO Relay as Used for Alphasat NFIRE Optical inter-satellite links TerraSAR-X Inter-satellite links Space-to-ground links Ground-to-space links at data rates of Gbps Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
19 LCT: GEO-LCT for Alphasat Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
20 Alphasat LCT, the GEO Relay Demonstrator NFIRE TerraSAR-X Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
21 GEO-to-Ground Links at 1.8 Gbps and more. Data rate increased by large telescope diameter (40 cm) Requires adaptive optics Deformable mirror (12 x 12 elements, element size 0.45mm x 0.45mm) Verified under worst case conditions with a coherent beam running horizontally across more than 20 km through the atmosphere, 1 m RX aperture Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
22 Laser Communication Terminals for Alphasat (GEO) Sentinal 1-a (LEO) Sentinal 2-a (LEO) EDRS-A (GEO) EDRS-C (GEO) Framce Contract with ESA Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
23 Summary Laser Communication based on homodyne BPSK ready for commercial operation Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
24 Thank you very much for your attention! For further information please contact: The LCT development and the in-orbit verification is supported by the German Space Agency DLR/BMWi under 50YH0202 and 50YH063 Dr. Robert Lange Tesat-Spacecom Gerberstraße Backnang Laser Products, Dr. Robert Lange Tesat-Spacecom GmbH & Co.KG
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