Two- Stage Control for CubeSat Optical Communications
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1 Two- Stage Control for CubeSat Optical Communications Ryan W. Kingsbury Kathleen Riesing, Tam Nguyen, Prof. Kerri Cahoy MIT Space Systems Lab CalPoly CubeSat Developers Workshop April 24, 2014
2 Outline Problem Statement Prior Art: Free- space Optical Communications at LEO CubeSat- scale FSO FSO System Architecture & Requirements Pointing, Acquisition and Tracking (PAT) Future Work 4/24/2014 Kingsbury - CubeSat Developer's Workshop 2
3 Problem Statement Design and optimize a CubeSat- scale free- space optical communication system utilizing staged pointing control. Free- space optical (FSO) communications Improve size, weight and power (SWaP) over RF Reduced regulatory burden High- gain apertures à stringent pointing requirements Current FSO realizations are for larger spacecraft 10 s of kg, 10 s of Watts Microradian (~arcsecond) pointing 4/24/2014 Kingsbury - CubeSat Developer's Workshop 3
4 Outline Problem Statement Prior Art: Free- space Optical Communications at LEO CubeSat- scale FSO FSO System Architecture & Requirements Pointing, Acquisition and Tracking (PAT) Future Work 4/24/2014 Kingsbury - CubeSat Developer's Workshop 4
5 OICETS / LUCE LUCE: Laser- Utilizing Communications Experiment Successful LEO- to- ground FSO demo ( ) Bidirectional capability Closed- loop tracking using beacon signal Multi- stage control Range/resolution limits that are inherent to all actuators Coarse: Hz (gimbal) Fine: Hz (piezo FSM) Image credit: JAXA 4/24/2014 Kingsbury - CubeSat Developer's Workshop 5
6 AeroCube- OCSD 1.5U CubeSat (x2) 5 Mbps downlink Body- pointing only 1065 nm, 1.4 deg. HPBW 14W optical power out Ground station (Mt. Wilson) 30 cm aperture COTS APD detector Pointing accuracy from 0.6 deg to 0.1 deg (sensor dependent) Project status: Launch in late 2014, early /24/2014 Kingsbury - CubeSat Developer's Workshop 6
7 AeroCube- OCSD vs. Our Project AeroCube- OCSD is an important first step, however Single stage control design Body pointing only, lacks steerable optics Difficult to scale to higher data rates due to TX power limits Our design philosophy: FSO payload should be self- sufficient, applicable to a multitude of missions Partitioned control scheme makes use of host s ADCS, while providing fine steering mechanism for FSO Beam width reductions are key to improving FSO systems 4/24/2014 Kingsbury - CubeSat Developer's Workshop 7
8 Outline Problem Statement Prior Art: Free- space Optical Communications at LEO CubeSat- scale FSO FSO System Architecture & Requirements Pointing, Acquisition and Tracking (PAT) Future Work 4/24/2014 Kingsbury - CubeSat Developer's Workshop 8
9 FSO System Configuration Most CubeSat developers want to downlink science data Asymmetric link design Hybrid RF/ optical system: Low- rate RF link (UL/DL) High- rate optical DL Closed- loop tracking using optical beacon signal 4/24/2014 Kingsbury - CubeSat Developer's Workshop 9
10 Requirements Flow- down 3U CubeSat SWaP constraints RF solution throughput ( the competition ) Existing CubeSat ADCS technology FSO payload SWaP limits FSO link acq. time FSO link rate Optical power FSO beam width Fine pointing capability External Self-imposed Derived 4/24/2014 Kingsbury - CubeSat Developer's Workshop 10
11 Requirements Link Parameters Rate: 10 Mbps Range: 1000 km Space Segment Size/mass: 0.5U, 1 kg Power: 10W (TX), 1W (idle) Example Downlink Radiometry Transmitter: 1550 nm at 1 W Receiver: Aperture: 30 cm Sensitivity: 1000 photons/bit Atmospheric losses: 6 db Ground Segment Transportable telescope & mount (e.g. 30 cm) COTS detector technology (e.g. APD, PMT) To achieve 10 Mbps, half- power beamwidth needs to be 0.12 deg. FSO pointing requirement typically needs to be 1/10 th beam width. (0.72 arcmin or 0.21 mrad) 4/24/2014 Kingsbury - CubeSat Developer's Workshop 11
12 CubeSat ADCS Today Mission Organization Year Pointing Accuracy AeroCube 4 The Aerospace Corporation deg Aeneas USC SERC deg QbX- 1/QbX- 2 NRL deg CanX- 2 University of Toronto SFL deg OCSD The Aerospace Corporation ~ deg Pointing accuracy to 2.0 has been demonstrated Sub- degree accuracy missions are under development Also need simultaneous high- rate slew (~ 1 deg/sec) Open question: how is accuracy degraded by slew maneuver? Large gap between current CubeSat ADCS solutions and pointing needs of high- rate low- power FSO comm. 4/24/2014 Kingsbury - CubeSat Developer's Workshop 12
13 Staged Control Approach Range/resolution/bandwidth limitations are inherent to all actuators and sensors Multi- stage solutions can alleviate these limitations Initial assumptions for stage partitioning (TBR): Coarse Stage (host CubeSat) Fine Stage (FSO payload) Type Body- pointing/slew Optical steering Range Full sphere 5 degrees Accuracy/ Resolution 5 degrees (3σ) 0.01 degrees (3σ) (Based on beam width) Bandwidth < 1 Hz > 1 Hz 4/24/2014 Kingsbury - CubeSat Developer's Workshop 13
14 Space Segment Diagram 4/24/2014 Kingsbury - CubeSat Developer's Workshop 14
15 Optical Steering Solutions PI S- 334 Tip/Tilt Mirror Two- axis, 12.5 mm mirror Piezo- electric actuation Steering range: 50 mrad Bandwidth: up to 200 Hz Size: 4 x 2 x 3 cm Image: Physik Instrumente L.P. Mirrorcle Tech. S1630DB Two- axis, 4.2 mm mirror Electrostatic actuation Steering range: 100 mrad Bandwidth: up to 1 khz Small chip- scale package Image: Mirrorcle Tech. 4/24/2014 Kingsbury - CubeSat Developer's Workshop 15
16 Closed- Loop Tracking Options Exploring two acquisition/tracking detector options Quadcell: limited FOV, good sensitivity, complex optics Focal plane: wider FOV, but less sensitive, simpler optics ConfigA: quadcell, common path ConfigB: focal plane, independent 4/24/2014 Kingsbury - CubeSat Developer's Workshop 16
17 Outline Problem Statement Prior Art: Free- space Optical Communications at LEO CubeSat- scale FSO FSO System Architecture & Requirements Pointing, Acquisition and Tracking (PAT) Future Work 4/24/2014 Kingsbury - CubeSat Developer's Workshop 17
18 PAT Introduction PAT: Pointing, acquisition and tracking Start: mission- specific satellite attitude End: fine- pointing alignment of optical terminal with ground station, optical link established Acquisition starts at 1000 km range 400 km LEO orbit à approx. 20 degrees above horizon Atmospherics make acquisition difficult at lower angles Beam point- ahead issues can be ignored due system beam width and orbital geometry. 400 km LEO à 51 microradian (10 arcsec) 4/24/2014 Kingsbury - CubeSat Developer's Workshop 18
19 PAT Process Overview Ground Terminal Space Terminal Point Point telescope (open- loop) at predicted satellite position Enable uplink (UL) beacon Acq. Waits for downlink acquisition sequence Track Monitor link performance Refine pointingbased on arrival angle of downlink (optional) Host ADCS points to ground terminal; use uplinked TLEs WFOV beacon detector looks for UL signal Coarse pointing scan (optional) Steer FSM to offset indicated by UL beacon (fine steering) Transmit downlink acquisition sequence Switch to comm transmission Coarse pointing errors fed to host ADCS 4/24/2014 Kingsbury - CubeSat Developer's Workshop 19
20 Beacon Design Drivers Goal: High probability we hit the satellite with the beacon Sources of uncertainty Satellite position knowledge: 2 mrad Ground telescope pointing: 200 urad Ground segment implications Beacon divergence must be larger than uncertainties Eye safety limitations Space segment implications Tracking detector field of regard must be larger than spacecraft coarse pointing uncertainty Detector resolution must be better than desired fine pointing performance 4/24/2014 Kingsbury - CubeSat Developer's Workshop 20
21 Future Work Control system analysis End- to- end system model: performance during slew Stochastic analysis: actuator saturation, stage handoff time Component selection & qualification Optical transmitter / amplifier Fast- steering mirror, driver integration High- speed electronics: driven by FEC/interleaving needs Beacon design: spatial diversity needs End- to- end bench demonstration Flight- like optical components, eval. board electronics Disturbances simulated with mechanical shaker table 4/24/2014 Kingsbury - CubeSat Developer's Workshop 21
22 Closing First attempts at CubeSat FSO comm motivated by: Demand to downlink payload data Advances in CubeSat ADCS Our work will address future implementation gaps: Optical steering mechanism and staged control High- speed electronics Acknowledgements JPL Strategic University Research Partnership (H. Hemmati, W. Farr) NASA NSTRF Program (A. Swank) Thesis Committee (D. Caplan, J. Twichell at MIT LL) 4/24/2014 Kingsbury - CubeSat Developer's Workshop 22
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