TANDEM-X: DEM ACQUISITION IN THE THIRD YEAR ERA
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1 TANDEM-X: DEM ACQUISITION IN THE THIRD YEAR ERA D. Borla Tridon, M. Bachmann, D. Schulze, C. J. Ortega Miguez, M. D. Polimeni, M. Martone and TanDEM-X Team Microwaves and Radar Institute, DLR 5 th International Conference on Spacecraft Formation Flying Missions and Technologies
2 Slide 2 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Outline Overview about TanDEM-X Mission TanDEM-X Global DEM Acquisition Plan Current Acquisition Status (First and Second Year) Acquisition Plan for the Third Year Antarctica Difficult Terrain Conclusions
3 Slide 3 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Outline Overview about TanDEM-X Mission TanDEM-X Acquisition Plan Current Acquisition Status (First and Second Year) Acquisition Plan for the Third Year Antarctica Difficult Terrain Conclusions
4 Slide 4 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era TerraSAR-X-add-on for Digital Elevation Measurements Overall Mission Goals acquisition of a global DEM according to Level-3 standard generation of local DEMs with Level-4 like quality demonstration of innovative bistatic imaging techniques and applications TerraSAR-X / TanDEM-X: German Earth observation SAR satellites Public Private Partnership (PPP) 9.65 GHz Multi-mode highly flexible operation TSX-1 Launched on June 2007 TDX-1 Launched on June km dusk/dawn orbit Spatial Resolution Absolute Vertical Accuracy (90%) Relative Vertical Accuracy (point-to-point in 1 cell, 90%) DTED-1 90 m x 90m < 30 m < 20 m DTED-2 30 m x 30m < 18 m < 12 m TanDEM-X 12 m x 12m < 10 m < 2 m Level-4 6m x 6m < 5 m < 0.8 m Slide 4
5 Slide 5 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Helix Formation
6 Slide 6 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Cross-Track Interferometry for DEM Acquisition Image1 Image 2 Interferogram TerraSAR-X B φ TanDEM-X DEM Unwrapping H z
7 Slide 7 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Outline Overview about TanDEM-X Mission TanDEM-X Global DEM Acquisition Plan Current Acquisition Status (First and Second Year) Acquisition Plan for the Third Year Antarctica Difficult Terrain Conclusions
8 Slide 8 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era TanDEM-X Global DEM Acquisition Plan Commissioning phase 1 st global coverage 2 nd global coverage Additional Acquisitions & Special Science 1 st Global Coverage Small baseline (~200 m) HoA* ~ 45 m 2 nd Global Coverage Increased baseline (~300 m) HoA* ~ 30 m Combination: Dual Baseline Phase Unwrapping Improved Height Accuracy Additional Acquisitions (3 rd year) Difficult terrain to account for shadow & layover Different viewing geometry Antarctica Secondary Mission Goals Science acquisitions with special formations Higher resolution DEMs with local extend *HoA: Height of Ambiguity 2π Interferometric Phase
9 Slide 9 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Interferometric Coherence of 1 st Year scene (1 scene = 50x30 km 2 ) Mean land coherence: 91.8% higher than 0.6 ( Good -Quality Flag: 87.6%) Forest: Volume Decorrelation Deserts: Low SNR Solid Surface: High Coherence Mountains: Shadow/Layover
10 Slide 10 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Formation Flying Configuration 1st year 2nd year 3rd year Height of Ambiguity 2π Interferometric Phase large baseline small HoA small rel. height error Phase of libration: relative ascending node relative perigee
11 Slide 11 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era DEM Acquisition Timeline Derivation LandMask Beam definition Desired baseline (HoA) Helix Optimization Acquisition Timeline derivation: orbit usage Formation parameters Flight Dynamics (DLR-GSOC) Acquisition param.: PRF, duty cycle, energy, memory Performance param.: SNR, ambiguities, coherence Satellite resources/ downlink Acquisition parameters optimization TanDEM-X Timeline: start/stop time, beam TanDEM-X orders Mission Planning (DLR-GSOC)
12 Slide 12 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Outline Overview about TanDEM-X Mission TanDEM-X Global DEM Acquisition Plan Current Acquisition Status (First and Second Year) Acquisition Plan for the Third Year Antarctica Difficult Terrain Conclusions
13 Slide 13 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Antarctica Left-Looking acquisitions required -> low energy absorption by solar panels Acquisition in winter in Southern Hemisphere to avoid ice melt and low quality data Eclipse between May and August -> less energy on the solar panels => Acquisitions in the beginning of May Downlink & on-board memory limited (TDX:768 GBit, TSX:384 GBit) HoA O Higgins Vertical dist = 300 m Horizontal dist = 230 m
14 Slide 14 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Antarctica Left-Looking acquisitions over a radius of 1300 km Right-Looking acquisitions in the outer region
15 Slide 15 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Outline Overview about TanDEM-X Mission TanDEM-X Global DEM Acquisition Plan Current Acquisition Status (First and Second Year) Acquisition Plan for the Third Year Antarctica Difficult Terrain Conclusions
16 Slide 16 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Difficult Terrain: Deserts and Mountainous Regions to be acquired in the Third Year - Shadow and Layover - Desert
17 Slide 17 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Difficult Terrain: Mountainous Regions Steep and rough surfaces => Phase unwrapping errors => HoA > 85 m required Shadow and Layover effects
18 Slide 18 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Difficult Terrain: Mountainous Regions Steep and rough surfaces => Phase unwrapping errors => HoA > 85 m required Ascending Andes Shadow and Layover effects => Different viewing geometry: North descending / South ascending Shadow Shadow Layover Descending
19 Slide 19 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Difficult Terrain: Deserts Deserts: low SNR => low coherence => high relative height error Sandy deserts require small incidence angle: between 14 o and 28 o (nominal 28 o 48 o ) Rocky deserts present difficult topography => acquisition with different viewing geometry as for mountainous regions
20 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Formation Flying Configuration Larger HoA -> smaller baselines: Vertical dist. > 250 m Horizontal dist. > 120 m Minimum baseline: 100 m Different geometry -> Change in exclusion zones -> Change in the Phase of Libration by 180o (to transmit with both satellites) 1st year 2nd year 3rd ϕ = 20o year Baseline between TSX-1 and TDX-1 only 150m Radial[m] Slide 20 ϕ = 200o Cross Track [m] Phase of libration: relative ascending node relative perigee
21 Slide 21 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Formation Flying Configuration Larger HoA -> smaller baselines: Vertical dist. > 250 m Horizontal dist. > 120 m Minimum baseline: 100 m Different geometry -> Change in exclusion zones -> Change in the Phase of Libration by 180o (to transmit with both satellites) Radial[m] ϕ = 20o oo 200 ϕ = 20 ϕ = 200o Cross Track [m] Vertical dist = 300 m Horizontal dist = 230 m Phase of libration: relative ascending node relative perigee
22 Slide 22 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Outline Overview about TanDEM-X Mission TanDEM-X Global DEM Acquisition Plan Current Acquisition Status (First and Second Year) Acquisition Plan for the Third Year Antarctica Difficult Terrain Conclusions
23 Slide 23 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era TanDEM-X Global DEM Acquisition Plan Commissioning phase 1 st global coverage 2 nd global coverage Additional Acquisitions & Special Science May August April July 1 st Antarctica higher HoA Difficult terrain X 2 2 nd Antarctica lower HoA Science
24 Slide 24 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Conclusions The TanDEM-X mission will deliver a global DEM with unprecedented accuracy Stable operations in close formation 1 st global coverage completed in March 2012, 2 nd global coverage in April 2013 Antarctica acquisitions in Left-Looking mode in May-June 2013 Difficult terrain acquisitions from August 2013 Mountainous regions - shadow and layover effects => different viewing geometry Deserts: low SNR => steeper incidence angles
25 Slide 25 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Thank you for your attention!
26 Slide 26 D. Borla Tridon: TanDEM-X DEM Acquisition in the Third Year Era Acquisitions for the 1 st and 2 nd Coverage
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