Spaceborne GNSS at DLR/GSOC
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1 Spaceborne GNSS at DLR/GSOC O.Montenbruck German Space Operations Center, DLR Slide 1
2 Organization 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 Center Located at Oberpfaffenhofen (25 km west of Munich) Control center for unmanned and manned space missions GNSS Technology & Navigation Spaceborne GNSS Receiver design and testing Autonomous navigation systems Formation flying Hamburg Trauen Neustrelitz Bremen Berlin- Charlottenburg Braunschweig Berlin-- Adlershof Göttingen Köln-Porz Bonn Sankt Augustin Darmstadt Lampoldshausen Stuttgart Oberpfaffenhofen Weilheim Slide 2
3 Facilities GSOC Oberpfaffenhofen Control room (Columbus) Weilheim ground station Galileo control center EAC, MORABA, MUSC Slide 3
4 Research Areas Receiver Technology Autonomous Formation Flying Precision Navigation Slide 4
5 Roadmap Receiver Techology Affordable access to spaceborne GNSS technology Phoenix Miniature GPS PROBA-2 Embedded Real-Time Navigation Sentinel-3 SHEFEX-2 Low Budget Science Receivers ACES GNSS Reflectometry Namuru Software Defined GNSS Receiver Receiver and Navigation System Support Receiver Performance Assessment Slide 5
6 Phoenix GPS Receiver SigTech MG5001 board 75 x 50 x15 mm 5V regulated 14 krad total ionization dose DLR tracking s/w for LEO satellites and sounding rockets Measurement Noise C/N0 [db-hz] Carrier Phase [mm] Pseudorange [m] Doppler [m/s] Slide 6
7 Mission Highlights MAST COMPASS1 PROBA-2 (ESA, 2009) Flying Laptop (TU Stuttgart, 2010) X-Sat (NTU, 2009) TET (DLR, 2010) ARGO (NSPO, 2011) Slide 7
8 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 Example 400 km LEO orbit, 10 TECU VTEC, 1.5m UERE ephemeris errors m 3D rms error Slide 8
9 Testing of Spaceborne GNSS Receivers Signal Simulator Co-60 Source Thermal Vacuum Chamber Shaker Proton Cyclotron Slide 9
10 Roadmap Formation Flying & On-Orbit Servicing Innovative GN&C concepts for multi-satellite missions DGPS Navigation Impulsive Orbit Control PRISMA TANDEM-X Autonomous Formation Flying Mission Demonstrations Self-contained Navigation Systems (RF, optical) Optimum Distributed Orbit & Attitude Control PROBA-3? On-Orbit Servicing EPOS ARDOS Contact Dynamics Camera Based Navigation GNC-System Support, Parameter Identifcation DEOS SMART-OLEV Slide 10
11 Autonomous Formation Flying PRISMA (2009) SSC & Partners MAIN TARGE T Phoenix GPS Receiver MAIN Radio Link L1 GPS Code & Phase TARGET Phoenix GPS Receiver Demonstration RVD & Formation Flying Validation of Sensors, Actuators, Avionics Launch 2009 Real-Time Navigation System Slide 11
12 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 KBR [mm] GPS Time [hours] since 2003/07/29 00:00 Std.Dev.: 0.72mm GPS Time [hours] since 2003/08/04 00:00 Slide 12
13 Roadmap Precision Navigation High Precision Navigation Services for Future Space Missions Differential GPS Navigation of LEO Satellites Real-Time GNSS clock products Galileo Signal Analysis & Data Processing CONGO GNSS Receiver Network GPS based LEO POD, Near-Real-Time POD Sentinel, MetOp, SEOSAR Slide 13
14 TanDEM-X Precision Baseline Reconstruction Identical set of IGOR GPS receivers 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 dualfrequency CDGPS Kalman filter/smoother Single differenced measurements Single- or dual-frequency processing Slide 14
15 GIOVE-A Signal Analysis (2006) x Q (normalized) I (normalized) dbw/(m 2 Hz) f [MHz] Slide 15
16 Cooperative Network for GIOVE Observation (DLR/BKG) Mauii Fredericton Wettzell Chofu Bangalore Concepcion Hartebeesthoek Sydney operational under construction Slide 16
17 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 (???) Slide 17
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