Deep Space Optical Communications Discovery Technology Day

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Presentation transcript:

Deep Space Optical Communications Discovery Technology Day National Aeronautics and Space Administration Space Technology Mission Directorate Game Changing Development Program Deep Space Optical Communications for Discovery Technology Day Presented by: Abhijit (Abi) Biswas 9-April-2014 This document has been reviewed and determined not to contain export controlled technical data. www.nasa.gov/spacetech

Deep-Space Optical Communications (DSOC) Overview, Capabilities and Footprint Spacecraft Flight Laser Transceiver (FLT) 4W, 22 cm dia. 1550 nm Beacon & Uplink 1030 nm 292 kb/s @ 0.4 AU CBE MASS (kg) 28 Mass margin (%) 30 CBE POWER (W) 76 Power Margin (%) 31 Optical Head: 45 x 45 x 49 cm (95E3 cc) Elect. Box: 29 x 23 x 23 cm (15E3 cc) Performance using 4W average laser power w/22 cm flight transceiver to 5m ground telescope Ground Laser Transmitter (GLT) Table Mtn., CA 5kW, 1m-dia. Telescope Deep Space Network (DSN ) Ground Laser Receiver (GLR) Palomar Mtn., CA 5m-dia. Hale Telescope Optical Comm Ops Ctr. JPL, Pasadena, CA TBD MOC This document has been reviewed and determined not to contain export controlled technical data.

DSOC Key Characteristics Silicon Carbide Telescope & Optics (Front cover not shown) Deep-space optical communications characteristics Photon-efficient communications Pulse-position modulation w/ Near capacity achieving codes Laser beacon + Earth image assisted pointing from space Integrates new technologies green outline Flight Laser Transceiver (FLT) Assembly Uplink receiver Downlink transmitter Ground Laser Receiver(GLR) Photon-counting ground detectors 60% Eff. WSi nanowire arrays Hale Telescope Ground Laser Transmitter (GLT) 1030 nm Ground Lasers OCTL Telescope Ground Segment Point-Ahead Mirror Photon-Counting Space Receiver 40% QE Rad Tolerant Laser Transmitter Electronics Box 1550 nm Space Laser Transmitter Electronics processing & control cards, firmware, software, clock Spacecraft Disturbance Isolation Assembly 50 dB rejection

Implementation: Spacecraft/Launch Assumptions Deep-Space Optical Communications Operating Angular Disturbance (rad2/Hz) PSD of vibration assumed for indicated performance (141 rad RMS) RMS Disturbance power spectral density (PSD) PSD shown in figure on right RMS Instrument interface attitude knowledge error, roll about LOS to ground (1) 150 rad TBC Spacecraft cross-range velocity knowledge error (1) 5 m/s Spacecraft Pointing Control (3) 5mrad Comparable S/C pointing MRO : 2.1 mrad (Ka/X) JUNO: 4.4 mrad (Ka/X) Kepler: 2.1 mrad (Ka) DAWN: 11 mrad (X) Contamination Control CL 300 User Data Interface GigE

Implementation: FLT & Ground Station Assumptions Flight Laser Transceiver (FLT) Based on JPL design that had Concept Review in August 2010 Interface to spacecraft C&DH for downlinking user data over optical link Data-rates shown on p.1 Point-ahead angles of  400 rad (TBC) Doppler of 50 ppm (TBC) Beacon assisted pointing architecture presumed (i.e. no “handshaking”) Support uplink commanding max rate of 292 kb/s @ 0.4 AU 2-way ranging precision of 30 cm (TBC) Sun-angle limitations Sun-Earth-Probe angle > 12 Sun-Probe-Earth angle > 3 for operations (survive sun-pointing) Designed for TID of 20 krad

FLT TRL-Status All technologies advance to TRL-6 prior to EO FY17 Silicon Carbide Telescope & Optics (Front Cover shown) TRL-6 Flight Laser Transceiver (FLT) Assembly Uplink receiver Downlink transmitter Point-Ahead Mirror TRL-6 Photon-Counting Space Receiver TRL 2-3 Flight Electronics TRL 4-5 Laser Transmitter TRL 4-5 Spacecraft Disturbance Isolation Assembly TRL-4

NOTIONAL SCHEDULE DISCOVERY DSOC TECH. DEVELOPMENT DSOC FLT Concept Study Reports 4/16 Down Select Mission 10/16 CDR 9/18 Launch NLT 12/21 DISCOVERY DSOC FLT DSOC GROUND Selection Phase A Studies 5/15 Phase B Start 11/16 PDR 11/17 SIR 5/19 PSR 11/20 Phase A Start 6/17 4/19 3/18 7/18 SRR DSOC TECH. DEVELOPMENT TRL-6 Ground Complete 2/21 I&T

Planned AO Library Content Fact Sheet for Deep Space Optical Communication Technology Day Charts Published papers/reports on Deep-Space Optical Terminals (DOT) Technology characteristics Laser communication terminal interface details as they mature Joint weather statistics Palomar Mountain & Table Mountain, CA Contact information for queries and questions regarding interfaces

Point of Contact Abhijit (Abi) Biswas Sr. Optical Engineer Optical Communications Group Jet Propulsion Laboratory, California Institute of Technology Pasadena, CA 91109 Tele: (818)-354-2415 E-mail: Abhijit.Biswas@jpl.nasa.gov