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TanDEM-X Commissioning Phase Status   J. Hueso Gonzalez, M. Bachmann,   H. Hofmann and  DLR commissiong phase team
New Challenges TanDEM-X Mission <ul><li>Two satellites </li></ul><ul><li>System complexity increased </li></ul><ul><ul><li...
Overview TanDEM-X Commissioning Phase Plan <ul><li>Make satellite operational – monostatic and bistatic </li></ul><ul><li>...
Launch and Early Orbit Phase (LEOP) & Ground Segment Checkout
TanDEM-X Launch – June 21 st  2010 TanDEM-X launch video
LEOP – Orbit configurations <ul><li>TDX-1 insertion 15700 km behind TSX-1 </li></ul><ul><li>Earth rotation and time delay:...
LEOP & Ground Segment Checkout <ul><li>Space segment checkout </li></ul><ul><ul><li>Satellite activation </li></ul></ul><u...
First SAR Images of TDX-1 – Ukraine River Donets Agricultural land types ↕ Polarization response 24/06/2010; dual-pol SAR ...
First SAR Images of TDX-1 – Ukraine v TDX-1 v TRAIN Azimuth displacement moving target ~  v TRAIN range azimuth range
TDX-1 Monostatic Commissioning – Pursuit Monostatic Formation 20 km
TDX-1 Monostatic Commissioning Phase <ul><li>Profit from TSX-1 mission </li></ul><ul><ul><li>Experience commissioning phas...
Mono-CP: Safety Aspects <ul><li>Safe Formation Flight </li></ul><ul><ul><li>Collision avoidance mechanisms </li></ul></ul>...
Mono-CP: Calibration and Performance <ul><li>SAR External Calibration </li></ul><ul><ul><li>Campaigns for deploying point ...
Bistatic Commissioning – Close Formation
Bi-static Commissioning Phase <ul><li>Duration: 55 days </li></ul><ul><li>Close formation      0m average along track   5...
TanDEM-X Global Test Sites 0° - Equator 30°N 60°N 30°S 60°S
Highlights
Highlights <ul><li>Accurate injection in orbit </li></ul><ul><li>Satellite control  </li></ul><ul><ul><li>High attitude an...
TanDEM-X first interferogram and DEM (I) <ul><li>Repeat pass on 15/07/2010: 48s/370 km separation </li></ul><ul><li>Large ...
TanDEM-X first interferogram and DEM (II) <ul><li>Rotation of range-azimuth coordinates </li></ul><ul><li>Ground spectra c...
Results over October Revolution Island (Russian Arctic) Coherence DEM SAR Image Coherence Interferogram * Baseline: ~2600 ...
Questions? THE END
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TH1.L10.2: TANDEM-X COMMISSIONING PHASE STATUS

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  • Komplexitit ät um ein vielfaches erhöht im Gegensatz zu TerraSAR-X
  • Ich möchte mit dieser Folie nur einen kurzen Überblick zeigen, man muß die einzelen tasks nicht genau lesen können. Darauf gehe ich später ein. Was hier wichtig ist, sind die 3 Phase aus denen die Commissioning Phase besteht:
  • Das also die TDX aufnahmen in der TerraSAR-X Spezifikation sind Um die Bestrahlung des einen Satelliten mit dem anderen zu verhindern.
  • Das also die TDX aufnahmen in der TerraSAR-X Spezifikation sind Um die Bestrahlung des einen Satelliten mit dem anderen zu verhindern.
  • Transcript of "TH1.L10.2: TANDEM-X COMMISSIONING PHASE STATUS"

    1. 1. TanDEM-X Commissioning Phase Status J. Hueso Gonzalez, M. Bachmann, H. Hofmann and DLR commissiong phase team
    2. 2. New Challenges TanDEM-X Mission <ul><li>Two satellites </li></ul><ul><li>System complexity increased </li></ul><ul><ul><li>Close formation flying </li></ul></ul><ul><ul><li>Coordination TanDEM-X and TerraSAR-X mission acquisitions </li></ul></ul><ul><ul><li>Bi-static acquisitions and processing chain </li></ul></ul><ul><li>Requirements for a high quality global DEM </li></ul><ul><li>Short duration of commissioning phase required </li></ul><ul><ul><li>Limited nominal overlap </li></ul></ul><ul><ul><li>2.5 years for the DEM </li></ul></ul>CP TerraSAR-X 2007 2008 2009 2010 2011 2012 2013 2014 2015 TanDEM-X DEM Acquisition
    3. 3. Overview TanDEM-X Commissioning Phase Plan <ul><li>Make satellite operational – monostatic and bistatic </li></ul><ul><li>Verify specifications </li></ul><ul><li>Ensure satellite safety in close formation </li></ul><ul><ul><ul><li>20 km Formation </li></ul></ul></ul><ul><ul><ul><li>Close Formation </li></ul></ul></ul>TDX monostatic commissioning phase LEOP and GS checkout Orbit drift 1 month 2,5 months Launch 21.06.2010 Transition 20km 07.2010 Transition close formation 10.2010 2 months Operational01.2011 Bistatic commissioning phase
    4. 4. Launch and Early Orbit Phase (LEOP) & Ground Segment Checkout
    5. 5. TanDEM-X Launch – June 21 st 2010 TanDEM-X launch video
    6. 6. LEOP – Orbit configurations <ul><li>TDX-1 insertion 15700 km behind TSX-1 </li></ul><ul><li>Earth rotation and time delay: both satellites acquire different regions on the same pass </li></ul><ul><li>Approximation of TDX-1 640km/day </li></ul><ul><li>Objective: reach 20 km along track separation </li></ul><ul><ul><li>Allows repeat pass interferograms </li></ul></ul><ul><ul><li>No interferences for monostatic calibration </li></ul></ul>15700 km 20 km 510-515 km Height ~95 min Period 11 days Repeat cycle 97.4°, polar Inclination TSX-1 and TDX-1 reference orbit characteristics TSX-1 TDX-1
    7. 7. LEOP & Ground Segment Checkout <ul><li>Space segment checkout </li></ul><ul><ul><li>Satellite activation </li></ul></ul><ul><ul><li>Boom deployment </li></ul></ul><ul><ul><li>First contacts, telemetry </li></ul></ul><ul><li>Ground station checkout </li></ul><ul><ul><li>Tracking, downlink, data distribution </li></ul></ul><ul><li>Verification of orbit products: orbit position, attitude, baseline </li></ul><ul><li>Product ordering chain: planning, commanding and data dump </li></ul><ul><li>Thermal behaviour instrument </li></ul><ul><li>SAR processor checkout </li></ul><ul><li> required before starting the SAR system calibration </li></ul>
    8. 8. First SAR Images of TDX-1 – Ukraine River Donets Agricultural land types ↕ Polarization response 24/06/2010; dual-pol SAR image; ascending orbit, right looking
    9. 9. First SAR Images of TDX-1 – Ukraine v TDX-1 v TRAIN Azimuth displacement moving target ~ v TRAIN range azimuth range
    10. 10. TDX-1 Monostatic Commissioning – Pursuit Monostatic Formation 20 km
    11. 11. TDX-1 Monostatic Commissioning Phase <ul><li>Profit from TSX-1 mission </li></ul><ul><ul><li>Experience commissioning phase </li></ul></ul><ul><ul><li>TSX-1 with outstanding performance </li></ul></ul><ul><ul><li>Successful integration and verification of ground and space segment </li></ul></ul><ul><li>Characteristics orbit </li></ul><ul><ul><li>20 km along track separation: allow monostatic calibration </li></ul></ul><ul><ul><li>Helix formation – 300 m radial, 1305 m horizontal to compensate residual Earth rotation </li></ul></ul><ul><ul><li>Repeat pass acquisitions, same coverage, very small baseline </li></ul></ul><ul><li>Duration 2.5 months </li></ul>
    12. 12. Mono-CP: Safety Aspects <ul><li>Safe Formation Flight </li></ul><ul><ul><li>Collision avoidance mechanisms </li></ul></ul><ul><ul><li>Maneuver execution, 1 st helix formation </li></ul></ul><ul><ul><li>Acquisition Safe Mode (ASM): magnetic torquer mode </li></ul></ul><ul><li>Exclusion Zone </li></ul><ul><ul><li>Prevent mutual SAR illumination: damage electronics </li></ul></ul><ul><ul><li>Failure detection, isolation and recovery </li></ul></ul><ul><li>Sync Warning & Inter-Satellite Link </li></ul><ul><ul><li>TSX-1 – TDX-1 real time mutual health check </li></ul></ul><ul><ul><li>Contingency handling in ASM </li></ul></ul><ul><ul><li>Disable transmission when neighbor satellite is not nominal </li></ul></ul>
    13. 13. Mono-CP: Calibration and Performance <ul><li>SAR External Calibration </li></ul><ul><ul><li>Campaigns for deploying point targets and rainforest acquisitions </li></ul></ul><ul><ul><li>Geometric, antenna model, radiometric </li></ul></ul><ul><li>Internal Calibration </li></ul><ul><ul><li>TRM accuracy and stability </li></ul></ul><ul><ul><li>Monitor instrument drift, replica quality </li></ul></ul><ul><li>Overall SAR Performance </li></ul><ul><ul><li>Commanding, timing, instrument settings </li></ul></ul><ul><ul><li>Radiometric parameters: NESZ, ASR, resolution </li></ul></ul><ul><li>Product Verification </li></ul><ul><ul><li>Doppler centroid and pointing verification </li></ul></ul><ul><ul><li>Image quality, coverage </li></ul></ul><ul><li> Ensure quality for TerraSAR-X mission products </li></ul>
    14. 14. Bistatic Commissioning – Close Formation
    15. 15. Bi-static Commissioning Phase <ul><li>Duration: 55 days </li></ul><ul><li>Close formation  0m average along track 500m cross-track baseline </li></ul><ul><li>First bistatic cycle </li></ul><ul><ul><li>Ground stations network </li></ul></ul><ul><ul><li>Roll steering </li></ul></ul><ul><ul><li>Complete bistatic chain: order, commanding, processor </li></ul></ul><ul><ul><li>Baseline offset calibration </li></ul></ul><ul><li>DEM calibration tests </li></ul><ul><li>Flight Qualification Review </li></ul><ul><ul><li>Nominal DEM acquisition should begin </li></ul></ul>
    16. 16. TanDEM-X Global Test Sites 0° - Equator 30°N 60°N 30°S 60°S
    17. 17. Highlights
    18. 18. Highlights <ul><li>Accurate injection in orbit </li></ul><ul><li>Satellite control </li></ul><ul><ul><li>High attitude and orbit stability </li></ul></ul><ul><ul><li>Successful Acquisition Safe Mode test </li></ul></ul><ul><li>First SAR image three days after launch </li></ul><ul><li>First interferogram incorporating both satellites after 26 days </li></ul><ul><li>Excellent status of the ground segment chains for TerraSAR-X and TanDEM-X acquisitions </li></ul><ul><ul><li>Commanding </li></ul></ul><ul><ul><li>Processing </li></ul></ul><ul><ul><li>Downlink </li></ul></ul>No showstoppers at all! 220 m ± 2 km Altitude TDX-1 Expected Injection parameter 0.0095 deg ± 0.04 deg Inclination
    19. 19. TanDEM-X first interferogram and DEM (I) <ul><li>Repeat pass on 15/07/2010: 48s/370 km separation </li></ul><ul><li>Large along track distance: different coverage due to Earth rotation </li></ul><ul><li>Convergence at the poles  angular velocity Earth is reduced there </li></ul>TSX-1 TDX-1 Ground tracks cross at the poles
    20. 20. TanDEM-X first interferogram and DEM (II) <ul><li>Rotation of range-azimuth coordinates </li></ul><ul><li>Ground spectra can be aligned by applying squint during acquisition </li></ul><ul><ul><li>Observe the same portion of the azimuth spectrum </li></ul></ul>k x k y Ground spectra acquired at zero-Doppler Squint correction applied Rotated SAR coordinates Rotated ground spectrum -0.058º bkw squint doppler -500 Hz 0.93º fwd squint doppler 800 Hz x (range) y (azimuth) x‘ y‘
    21. 21. Results over October Revolution Island (Russian Arctic) Coherence DEM SAR Image Coherence Interferogram * Baseline: ~2600 m * h amb = 3m * DEM accuracy ≈ 10cm No azimuth filter needed in interferometric processing
    22. 22. Questions? THE END
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