TerraSAR-X: Status Report & Polarimetric Data Exploitation
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1 TerraAR-X: tatus Report & Polarimetric Data Exploitation Alberto Moreira & Irena Hajnsek German Aerospace Center (DLR) Folie TerraAR-X: A National cience Mission with Commercial Potential Public Private Partnership DLR - Project Management - G/ Development & Ops - cience Coordination EAD Astrium - Platform Development - Instrument Development - Launch on Dnepr (006) Infoterra - ervice Infrastructure - Information Products - Commercial Exploitation Main Mission Goals: Provision of TerraAR-X data for scientific applications Commercial exploitation of TerraAR-X data public interest by industry Folie
2 Application of AR Polarimetry Agriculture/Land-Use (+++) Crop classification Plant moisture content Crop condition Crop yield Forestry (+) Forest type Forest structure (horizontal) Clear cuts/fire-scars Geology (++) Geological structures Lava flows Weathering erosion studies urface roughness Hydrology (++) oil moisture now hydrology Wetlands Flood mapping (+++/high) (++/medium) (+/low) AR Polarimetry is recommended Oceans (+++) Waves Coastal zones hips detection ea / Land Ice (++) ea ice edge & ice concentration Ice topography/structure Polar glaciology Meteorology (+) Rain rate estimation Water/ice particle studies evere storm/ Flood warning Cartography/ Urban Area (++) Direct surface slope estimation Cartographic feature extraction Urban Area characterisation Disasters (++) Floods Geological hazards Oil spills earch & Rescue Folie center frequency 9.65 GHz (X-band) Tx bandwidth up to 50 MHz (00 exp.) PRF KHz to 6,5 KHz transmit duty cycle -0% radiated peak power 60 W system noise figure 5 db Folie 4
3 antenna dimension in azimuth m antenna dimension in elevation m azimuth beamwidth 0. elevation beamwidth. scan angle azimuth ± 0.75 scan angle elevation ± 9. Folie 5 TerraAR-X Orbit sunlight side night side dusk/down orbit altitude at equator 54.8 km inclination sun-synchronous repeat orbit: repeat period days revisit time 4.5 days (00%).5 days (95%) orbits per day 5 / Folie 6
4 TerraAR-X Mission Profile X-Band 00 Mbit/sec -Band TM & TC Raw Data Acquisition DLR G Neustrelitz DLR G Weilheim Mission Operations DLR Oberpfaffenhofen Folie 7 Θ =0 o Flight direction Nadir Track 0 wath Width 00 km Θ =55 o 45 TerraAR-X Imaging Modes tripmap Mode canar Mode potlight Mode (liding) HighRes potlight Mode (liding) Centre of rotation tripmap canar potlight HighRes potlight full perf. inc, angle range scene size along track acqu. length acqu. length 0 km 5 km scene size ground range 0 km 00 km 0 km 0 km single look az. resolution m 6 m m m single look range resolution m (ground) 6 m 5 looks. m (slant). m (slant) Folie 8 4
5 TerraAR-X Mission pace egment atellite Bus AR Instrument Mission Operations egment Ground egment IOC - Instrument Operations & Calibration egment Payload Ground egment cience ervice egment Commercial ervice egment cience Users Commercial Users Folie 9 Dual Antenna Mode Ocean Currents Target Velocities ATI Evaluation of TRM Data, IMF Traffic jam on A96 near Germering EAR data analysed by. uchandt, IMF Folie 0 5
6 Dual Antenna Mode the antenna is electrically divided into receiving antennas this enables full-polarimetric operation and along track interferometry Tx: H V H V Rx: H V H V H V H V Two-way (Tx-Rx): HV VH HV VH Folie Polarization Modes ingle Polarization polarization channel, {, } stripmap, spotlight, canar Dual Polarization polarization channels, {/, /HV, /HV} stripmap, spotlight coherent pol. phase smaller elevation beam Twin Polarization polarization channels, {/, /HV, /HV} stripmap incoherent pol. phase full elevation beam Quad Polarization All 4 pol. channels tripmap coherent pol. Phase smaller elevation beam Experimental product H H H H H H H H H H H H H H H H H V H V H V H V H H V H V H V H V H H H H H H H H V V H H V V V V V V V H V Folie 6
7 Range TerraAR-X: Fully Polarisation Mode Fully polarisation experimental mode specification: ystem Parameters /HV//VH cattering Matrix Local Incidence Angle wath Width lant Range Resolution Ground Resolution Cross talk isolation NEZ Radiometric calibration Values 0-45 degree 5 km.9 m Look 7 m & 6 Look 5 m 4 db one way better than -6 db abs.0 db, rel db Folie 4 HV cattering Amplitude Images VH HV VH Azimuth PI-AR /Test ite: GIFU-Japan X-band quad pol. Courtesy: Hiroshi Kimura Folie 5 7
8 ingle v. Fully Polarised Increasing Observation pace - Adding Information PI-AR / Test ite: GIFU- Japan Pauli-cattering Vector X-hh X-Band R:hh-vv G:hv B:hh+vv Folie 6 Polarimetric Parameters / cattering Matrix [] = exp( iκr )exp( iφ ) [ ] = r exp i( φ exp i( φ φ ) φ ) expi( φ φ ) Absolute Phase Factor Five Parameters: Amplitudes & Phases cattering Amplitudes σ : = σ : = σ : = 0 N 0 N 0 N Total Power TP + : = + 4 Amplitude Ratios σ / σ σ / σ σ /( σ + σ ) Pol Phase Differences φ := φ φ Helicity Hel : = LL RR Folie 7 8
9 Polarimetric Parameters: Agricultural Fields Pauli RGB / Ratio / Ratio / Ratio PI-AR X-band / Test ite: Gifu, Japan Courtesy: Hiroshi Kimura Folie 8 econd Order Polarimetric Parameters A r k = B C [ ] r r =< k k + X : >= AA BA CA AB BB CB AC BC CC A: = ( + ) B: = ( ) A: = B : = Nine Parameters: Real & Complex Elements C: = C : = Correlation Coefficients γ : = < < > >< > γ LLRR : = < < LL LL LL RR > >< RR RR > cattering Entropy cattering Anisotropy Polarimetric Alpha Angle H : = log i= λ λ P P A: = = λ + λ P + P P i P α : = P α + P α + P α i λ λ + λ + λ i P i : = Polarimetric Beta Angle β : = P β + P β + P β Folie 9 9
10 Polarimetric Parameters: Agricultural Fields Pauli RGB Entropy Alpha Angle Anisotropy PI-AR X-band / Test ite: Gifu, Japan Courtesy: Hiroshi Kimura Folie 0 Access to TerraAR-X for scientific purposes TerraAR-X mission goals: provision of high resolution X-band data for scientific applications to develop a profitable and sustainable geo-information business based on TerraAR-X data and products Equal share of the satellite s capacity Access for scientific purposes is gained via a selection process Pre-launch AO (closed in October 005) Further AO planned (End of 007) General proposal submission interface (ummer 007) Folie 0
11 TerraAR-X Mission tatus The TerraAR-X satellite has passed the Final Acceptance Review after successful Environmental testing. (Vibration, EMC, Thermal Balancing, Thermal Vacuum, Acoustic Noise, center of gravity) Integrated ystem Tests ( Functional, Performance, Characterization) Final antenna phase and amplitude trimming pace segment to Ground segment Tests (LEOP, mission sequence, end to end ) The satellite, the secondary payload (LCT and TOR) the ground segment (MO, PG, IOC) are ready for launch! hipment to Baikonour is planned for end January. Folie
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