Mission Status and Data Availability: TanDEM-X

Transcription

1 Mission Status and Data Availability: TanDEM-X Irena Hajnsek, Thomas Busche, Alberto Moreira & TanDEM-X Team Microwaves and Radar Institute, German Aerospace Center 26-Jan-2009

2 Outline Preparation for the pre-launch Announcement of Opportunity for TanDEM-X 1. What is TanDEM-X? 2. What are the capabilities of TanDEM-X? 3. Which are the provided products? 4. What is the mission status of TanDEM-X? 5. How can I submit a proposal? 6. What is the time plan? Slide 2

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4 NGA* Standards for Digital Elevation Models Spatial Resolution Absolute Vertical Accuracy (90%) Relative Vertival Accuracy (point-to-point in 1 cell, 90%) DTED-1 90 x 90 m < 30 m < 20 m DTED-2 30 x 30 m < 18 m < 12 m HRTI-3 12 x 12 m < 10 m < 2 m HRTI-4 6 x 6 m < 5 m < 0.8 m SRTM / X-SAR TanDEM-X Simulation ~ DTED 2 ~ HRTI 3-4 *National Geospatial-Intelligence Agency (US) Slide 4

5 Identified Scientific Needs Across track InSAR (Digital Elevation Model) Development & improvement of algorithm for validation of heights derived from InSAR; Input parameter for a variety of different applications (e.g. the safety critical aviation terrain database, crisis management (determination of infrastructure), glacier/ice mass changes & retreat, hydrodynamical models, coastal zone lineation, wind fields determination, geological maps, etc.) Added values and generation of scientific products Along track InSAR (Velocity Measurements) Exploitation of innovative applications and development of algorithm for velocity measurements for traffic flow monitoring, ocean currents, river flow monitoring New application and scientific product development New SAR Techniques (First Technical Demonstrations) Demonstration and exploitation of new SAR techniques, understanding and development of new algorithms for multistatic SAR, polarimetric SAR interferometry, super resolution, digital beamforming, InSAR processing, formation flying New perspectives for future SAR systems and development of new applications Slide 5

6 Capabilities of TanDEM-X Cross-Track Interferometry Along-Track Interferometry New Techniques r+δr r t+δt t Digital Elevation Models Spatial Coherence (forest, ) Double DInSAR (change maps,..) High Resolution SAR Images Large Scale Velocity Fields (ocean currents, ice drift, ) Moving Object Detection Temporal Coherence Maps 4 Phase Center MTI (traffic, ) PolInSAR (vegetation height, ) Digital Beamforming (HRWS, ) Bistatic Imaging (classification,..) TanDEM-X is a highly flexible sensor enabling multiple powerful imaging modes cross-track baselines (0 km to several km) interferometric modes (bistatic, alternating, monostatic) bandwidth / resolution ( /300 MHz) polarisations (single, dual, quad) along-track baselines (0 km to several 100 km) SAR modes (ScanSAR, Stripmap, ) incident angles ( ) Slide 6

7 Along-Track Interferometry HELIX split antenna sensitive to fast movements sensitive to slow movements BInterferometric along 2.4 m 100 m Phase: Δx 12 m 12 m σ 0-12 dbm2 /m2 θ inc 45 v amb 500 km/h 12 km/h Δv ~9 km/h 0.2 km/h Slide 7

8 Digital Beamforming with Four Phase Centres Ch. 1 Ch. 2 Ch. 3 Ch. 4 P 1 (f) P 2 (f) P 3 (f) P 4 (f) without reconstruction SAR Proc. Ambiguity Suppression with reconstruction Enables High Resolution Wide Swath Imaging Slide 8

9 Double Differential SAR Interferometry e.g. difference between two single-pass cross-track interferograms Bistatic Bistatic Strip Strip map map B = m Δx Δx = = m h(t 1 ) pass 1 ϕ 1 pass 2 ϕ 2 Δh < 10 cm h(t 2 ) Δh ~ ϕ 2 - ϕ 1 coherence between passes not mandatory Grounding line detection, vegetation growth, snow/ice accumulation,? Slide 9

10 Polarimetric SAR Interferometry (e.g. Crop Characterisation) polarisations pdf(μ min ) Parameters Parameters h = m β = db/m db/m μ min -7.0 db min = -7.0 db μ max 3.0 db max = 3.0 db B km = 4 km θ inc 35 inc = 35 Δx Δx = m pdf(μ max ) Slide 10

11 Bistatic Radar Imaging Extended Observation Space θ Tx θ Rx φ improved detection, segmentation, and classification from bistatic RCS new image and object parameters (bistatic Doppler, multiple shadows,...) Color composite of three bistatic SAR images from DLR-ONERA bistatic SAR experiment (P. Dubois Fernandez et al., IEE Proc.. RSN, 2006) Slide 11

12 General Outline of the Data Acquisition Plan Nominal Data Acqusition 3 (+?) Years t 3(+2) months 1 year 1 year 6 months 3 months Commissioning Phase 1 global DEM acquisition with small baselines + acquisition of approx scientific radar data products 1 global DEM acquisition with scaled (larger) baselines + acquisition of scientific radar data products DEM data takes for difficult terrain with different viewing geometry + radar data products radar data products and customized DEMs with large interferometric baselines Slide 12

13 Example of First Year: Mapping Europe Slide 13

14 Example of First Year Data Acqusition of Polar Regions Gap Gap will will be be filled filled with with leftlookinlooking data data takes takes at at an an left- incident incident angle angle of of ~60. ~60. Required Required time time will will be be one one repeat repeat cycle cycle with with a max. max. recording recording time time <180s. <180s. ~2 months required to map polar regions Slide 14

15 Opportunities for Science Data Takes: Example Orbit 131 DEM Acquisitions Used for TerraSAR-X & secondary mission goals & new techniques Slide 15

16 TanDEM-X Data Products SAR products: experimental products from operational modes (co-registered complex images CoSSCs ) experimental mode raw data (processing with help from DLR contact scientist) TS-X mission basic products* from selected TanDEM-X raw data sets byproduct of operational DEM processing chain: archive of CoSSCs from all acquisitions for DEM generation (multi-temporal global coverage) DEM products: HRTI-3 specified DEM Intermediate DEM: close to HRTI-3 specified DEM FDEMs: DEMs processed to finer pixel spacing and higher random height error HDEMs: HRTI-4 like DEMs (high resolution DEM, were additional acqusitions are needed) *: TS-X basic product performance parameter specification does not apply Slide 16

17 TanDEM-X Timeline German Call for Proposals for a Future Earth Observation Mission Selection of TanDEM-X for Phase A Study Phase A Study Final Decision Phase B/C/D TDX Operation TSX Operation At least 3 years of joint operation Slide 17

18 TanDEM-X Data Proposal Submission Opening the pre-launch Announcement of Oportunity end of Feb 2009: Tool available under a new TanDEM-X homepage Proposal submission will be open for 2-3 months until end of April 2009 Evaluation process will take 2 months until end of June 2009 Integration into the Data Acquisition timeline until end of July 2009 ~ OPEN FROM FEBRUARY 09 Slide 18

19 DEM product: TanDEM-X DEM HRTI-3 Specified DEM FDEMs: DEMs processed to finer pixel spacing and higher random height error HDEMs: HRTI-4 like DEMs (high resolution DEM, were additional acqusitions are needed) DEM product consists of the following information layers: Elevation (DEM, 4 Byte) Height Error Map (HEM, 4 Byte) Flag Mask (FLM, 1 Byte) Water body Shadow and layover Amplitude Mosaic DEM HEM TanDEM-X DEM: 4 years after launch (Oct. 2013) Intermediate TanDEM-X: 2.5 years after launch with first global coverage (less quality) Tiles in Geotiff in 1 x 1 in geogr. coordinates FLM Slide 19 AMP