a satellite tracking demonstration on ground
TRANSCRIPT
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
A Satellite Tracking Demonstration On
Ground Using a 100mm Class Aperture
Optical Antenna for Space Laser
CommunicationH. Kunimori, M.Okawa, H.Watanabe
National Institute of Information and Communications Technology (NICT), Japan and
Y. Yasuda
Emeritus Waseda University, Japan
1 Introduction
2 NeLS Optical Terminal (OE)
3 Tracking Demonstration by partly use of NeLS-OE
4 OICETS Sat.-Ground experiment
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
History of Optical Tracking and Laser
Commnication at NICT(CRL/RRL)ETS-VI
LCE
ARTEMISOPALE(ESA)1990199019901990 2000200020002000 2010201020102010GEO
LEO
GND1980198019801980GMS-2 GMS-3 GMS-4
Laser Laser TrasmissionTrasmissionExperimentExperiment
ArAr laser+ Co2laser+ Co2
Laser RangingLaser Ranging
OICETSLUCE
(JAXA)
Optical TrackingOptical Tracking
GEOGEO--GNDGNDLaserCommLaserComm
GEOGEO--LEOLEO
TwoTwo--way way LaserComLaserCom..
LEOLEO--GNDGNDTwoTwo--way way LaserComLaserCom..
NICT1.5m telescopeKeystone 75cm telescope
NeLS((((NICT))))-Introduction-
AJISAI,AJISAI,
ADEOS, ADEOSII,ADEOS, ADEOSII,LRE, ALOSLRE, ALOS
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
NeLS: Next Generation LEO System
Goal
Optical ISLNetwork
•The Next Generation LEO System Research Center (NeLS) Research Center in National
Institute of Information and Communications Technology (NICT), of Japan, formed in 1997,
and since 2002, has been focusing on the development of optical inter-satellite link
technology for the future satellite communication demanding a high data transmission for
global multimedia service, including science data downlink requirement.
Termianls
Networking
User Link
Inter-Sat.
Optical link
-Introduction-
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
FY2002 FY2003 FY2005FY2004 FY2006
Manufacture Validation
test on
Ground
Sytem Design
Detail
Design
Proposal of Next
Generation
of DRTS
Ground test facility
OPT
TXRate
Conv
OPT
RX
PDR
Optical
EM
Com.Unit
BBM
ATP Electronics
BBM
----------------------- 要素技術の研究 -------------Maintenace
Design
NeLS OE Project Schedule
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
NeLS Optical terminal was designed for 1.5um wavelength and 2.4Gbps data rate
communication between 500km-3000km inter-satellite link. It consists of four
subsystems, as shown in Fig.1, 1)Coarse Pointing Mechanism (CPM), 2) Fixed Optical
part ( Antenna and FPM optics on Bench), 3) AT&P electronics Unit for Acquisition,
Tracking and Pointing control, and 4)Communication Unit.
NeLS Optical Terminal
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
10cm class Coarse Pointing Mechanizm (CPM)Type Elbow・Optical Antenna fixed to satellite body・Moving part: two flat mirrors for guiding
light through 45deg incident angle on each
gimbal axis・Cover all direction in space
16kgWeight
2/10000degResolution of
encorders
85mmEffective
aperture size
3.0deg(slew)
1.0deg(track))))Maximum
drive speed
Az:+/-275deg
EL:+/-110deg
Range of drive
axis
SpecificationItem
-NeLS Termianl-
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
Optical Antenna
Type: Cassegrain
Tripod supports
structure for secondary
mirror
125mm diameter
Material:SiC
Gold Coating
TFl:2600mm
Subsystem: OPTICAL ANTENNA-NeLS Termianl-
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
Transmitting Fiber Coupler (left) Transmitting Fiber Coupler (left) Transmitting Fiber Coupler (left) Transmitting Fiber Coupler (left) Receiving Fiber Coupler& QD (right)Receiving Fiber Coupler& QD (right)Receiving Fiber Coupler& QD (right)Receiving Fiber Coupler& QD (right)Fine Pointing Mirror(FPM)
Key components internal optics -NeLS Termianl-
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
Goal of ground test
• Evaluate ATP Performance and Communication
performance Near field (range 5m-4km)
• Validate Open Loop tracking capability using
CPM and Optical Antenna by Associated
Satellite Laser Ranging subsystem.
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
AC100V
Table controller1
Table Controller2(rack) Target Head モーションテーブルImage analysis
Optical Terminal
Image Sensor PCAC100V
AC100V
AC100V
Laser wavelength1550nm/633nm
Laser
syncro
Orbit Simulator
Simulated target by
X, Z, Az, El axes
x
z
AzEl
Utility development for Ground experiment
4 Axis Motion table
Optical Terminal
under test
-Ground Test-
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
Utility development for Ground experiment
CPM Mount,
and driver
unit for
Ground
Experiment
Chiller for
dome
Dome
housing for
Optics and
Electronics
for Ground
Experiment
-Ground Test-
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
Mobile Dome
Rotor 30cm fai
optical
window
Rotor-Motor
Az-Motor
-Ground Test-
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
Configuration of Optical comm. and SLR equipments
Equipment for
SLR optics
Equipment for Dome
Controller , SLR and
Comm.
Optical
Antenna#2Precision Level Adujster
Equipment for
Comm.
-Ground Test-
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
Dome at building Koganei-Ground Test-
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
LEO Tracking follow-on error evaluation by Starlette 85
deg elevation pass
Black dot: Following Error Axis range+- 15arcsec
Red dot error RMS(2sec avarage) Axis range 0-10arcsec
AZ axis:
<1arcsec rms except around zenith
about 10arcsec rms
EL axis:
< 2arcsec rms except around
zenith about 6 arcsec rms
-Ground Test-
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
AJISAI First Return pass
record by NeLS CPM
Using NS 10Hz 532nm
A032ET
C-SPAD
January 26, 2006
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
SLR Pass List during Optical terminal validation phase
-Ground Test-
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
OICETS: VIEW of CCD Camera
Start tracking(El=15) El=33deg
End of Tracking(El=15deg)Downlink comm. beam
850nmBeacon/Uplink
to Satellite 810nm
• At Koganei 1.5m telescope on March 29, 2006
• Up to September, BER 10-5 in both Downlink(50Mbps) and Uplink(2Mbps) channel.
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
Mean -63.17 dBmSd(3σ) 14.04
600 650 700 750 800 850 900-85-80-75-70-65-60-55 NICT光地上局実験 2006.3.28相対時間[sec]精捕捉追尾センサ受光レベル [dBm] Received FPS power at OICETS uplink 100 200 300 400 500 600 700 800-85-80-75-70-65-60 ARTEMIS対向実験 2005.12. 12相対時間[sec]精捕捉追尾センサ受光レベル [dBm] Inter-Satellite link FPS power
Effect of with and without atmosphere turbulence
OICETS:
Received power stability through atmosphere
Time(sec)Receiv
ed F
PS
pow
er
(dBm)JAXA
The 15th International Laser Ranging Workshop Canberra, Oct.15-20,2006
Summary
• The Next Generation Inter-satellite LaserCom. (NeLS) Terminal Optical Part Engineering Model has been developed.
• By using newly developed utility for ground test validation, such as 4 axis motion table , mobile dome, optical terminal for 1.5um wavelength and 2.4Gbps data rate was evaluated in nearfield (5m-5km) including ATP performance with atmospheric existence.
• Using Coarse Pointing Mechanism (CPM) and 10 cm class Optical antenna and, and associated 532nm pulse laser connection pass, we have demonstrated open-loop tracking capability by ranging to AJISAI.
• The present generation of LaserComm satellite (OICETS) results including atmospheric effect bliefly shown.
• Next Step is now using evaluation of those, we are proposing the next generation of DRTS(Data Relay Technology Satellite) in early 2010’s