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Slide 1Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Spaceborne GNSS at DLR/GSOC
O.MontenbruckGerman Space Operations Center, DLR
Slide 2Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Organization
� Köln -Porz
� Lampoldshausen
� Stuttgart
� Oberpfaffenhofen
Braunschweig �
� Göttingen
Berlin- - �Adlershof
� Bonn
�Trauen
� Hamburg
� Neustrelitz
Weilheim �
Berlin-Charlottenburg �
� Sankt Augustin
� Darmstadt
Bremen �
DLR (German Aerospace Center)Aeronautics, astronautics, energy, and transport research
National Space Agency
~5100 employees in 28 institutes
9 centers, 7 field offices
German Space Operations CenterLocated at Oberpfaffenhofen(25 km west of Munich)
Control center for unmanned and manned space missions
GNSS Technology & NavigationSpaceborne GNSS
Receiver design and testing
Autonomous navigation systems
Formation flying
Slide 3Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Facilities
Control room
(Columbus)
GSOC Oberpfaffenhofen
Weilheim
ground station
Galileo control center
EAC, MORABA, MUSC
Slide 4Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Research Areas
ReceiverTechnology
Autonomous Formation
FlyingPrecision
Navigation
Slide 5Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Roadmap Receiver Techology
2005 2009 2013
Phoenix Miniature GPS
Low Budget Science Receivers
Embedded Real-Time Navigation
2007 2011
Software Defined GNSS Receiver
„Affordable access to spaceborne GNSS technology“
Receiver Performance Assessment
Sentinel-3SHEFEX-2
PROBA-2
Namuru
GNSS Reflectometry
ACES
GNSS Reflectometry
Receiver and Navigation System Support
Slide 6Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Phoenix GPS Receiver
SigTech MG5001 board
75 x 50 x15 mm
0.8W @ 5V regulated
14 krad total ionization dose
DLR tracking s/w for LEO satellites and sounding rockets
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
C/N0 [dB-Hz]
Mea
sure
men
t No
ise
Carrier Phase [mm]Pseudorange [m]Doppler [m/s]
Slide 7Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Mission Highlights
X-Sat (NTU, 2009) ARGO (NSPO, 2011)
PROBA-2 (ESA, 2009) Flying Laptop (TU Stuttgart, 2010)
TET (DLR, 2010)
MASTCOMPASS1
Slide 8Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Phoenix-XNS (eXtended Navigation System)
Real-time Kalman filtering of GPS raw measurements
Ionosphere-free C1+L1 combination
Operates inside ARM7TDMI micro-processor of Phoenix receiver
Example400 km LEO orbit, 10 TECU VTEC, 1.5m UERE ephemeris errors
0.5-1 m 3D rms error
Slide 9Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Testing of Spaceborne GNSS Receivers
Signal Simulator
Thermal Vacuum Chamber
Co-60 Source
Proton CyclotronShaker
Slide 10Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Roadmap Formation Flying & On-Orbit Servicing
2009 20132007 20112005
DGPS Navigation
Impulsive Orbit Control
Mission Demonstrations
Self-contained Navigation Systems (RF, optical)
Optimum Distributed Orbit & Attitude Control
PRISMA TANDEM-X
PROBA-3 ?
EPOS ARDOS
Camera Based NavigationDEOS
SMART-OLEV
AutonomousFormation
Flying
On-OrbitServicing
„Innovative GN&C concepts for multi-satellite missi ons“
GNC-System Support, Parameter Identifcation
Contact Dynamics
Slide 11Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Autonomous Formation Flying – PRISMA (2009)
SSC & Partners
Demonstration RVD & Formation Flying
Validation of Sensors,Actuators, Avionics
Launch 2009
TARGET
MAIN
Radio Link
L1 GPS Code & Phase
MAIN
TARGET
Real-TimeNavigation System
Phoenix GPS Receiver
Phoenix GPS Receiver
Slide 12Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
SAR-Interferometry –TanDEM-X (2009)
Orbit Control
e/i-vector separation
Passive safety
Reproduction of TSX maneuvers
Relative Navigation
IGOR GPS Receiver
1 mm accuracy
TAFF Experiment
Intersatellite Link
Real-Time Navigation
Autonomous Control
GPS Time [hours] since 2003/07/29 00:00
2 4 6 8 10 12 14 16 18 20 22 24−10−8−6−4−2
02468
10Std.Dev.: 0.72mm
GPS Time [hours] since 2003/08/04 00:00G
PS
− K
BR
[mm
]
Slide 13Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Roadmap Precision Navigation
2005 2009 2013
GPS based LEO POD, Near-Real-Time POD
Differential GPS Navigation of LEO Satellites
Real-Time GNSS clock products
2007 2011
„High Precision Navigation Services for Future Space Missions“
Galileo Signal Analysis & Data Processing
Sentinel, MetOp, SEOSAR
CONGO GNSS Receiver Network
Slide 14Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
TanDEM-X Precision Baseline Reconstruction
Identical set of IGOR GPSreceivers on both s/c
Absolute orbits ~5cm 3D rms position accuracy
2.5 cm 3D rms DLR-AIUB
1.5 cm SLR residuals (10°elev)
TDX-TSX position difference ~1-2 cm
Relative navigation based on dual-frequency CDGPS
Kalman filter/smoother
Single differenced measurements
Single- or dual-frequency processing
Slide 15Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
GIOVE-A Signal Analysis (2006)
−1.5 −1 −0.5 0 0.5 1 1.5
−1.5
−1
−0.5
0
0.5
1
1.5
I (normalized)Q
(no
rmal
ized
)
0.5
1
1.5
2
2.5
3
x 104
1550 1560 1570 1580 1590 1600−240
−230
−220
−210
−200
dBW
/(m
2 Hz)
f [MHz]
Slide 16Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Cooperative Network for GIOVE Observation (DLR/BKG)
operational under construction
Concepcion
Mauii
HartebeesthoekSydney
Bangalore
ChofuFredericton Wettzell
Slide 17Space Geodesy Station Workshop > Matjiesfontein > 16 - 20 March 2009
Collaboration Options
Technical
GNSS real-time network setup (NTRIP) and utilization (clocks, iono,integrity)
SLR based orbit determination of GNSS satellites
SLR/GNSS cross-comparison for LEO satellites
Networking
Satellite Geodey at TU Munich (Urs Hugentobler) and Wettzell Station (GNSS, SLR, LRR, VLBI)
Zimmerwald Observatory (Werner Gurtner)
GALILEO project (???)