7.7 TerraSAR-X & TanDEM-X
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1 7.7 TerraSAR-X & TanDEM-X Two Innovative Remote Sensing Stars for space-borne Earth Observation Vorlesung Wolfgang Keydel Microwaves and Radar Institute, German Aerospace Research Center (DLR), D Oberpfaffenhofen, Germany Tel.: ; ; s: Microwaves and Radar Institute >
2 Prerunner 3 Space Shuttle Missions Feb X-SAR/SIR-C April & October
3 Referenzen Das verwendete Präsentationsmaterial kommt vorwiegend aus dem DLR- Institut für Hochfrequenztechnik und Radarsysteme, insbesondere von meinen Kollegen Alberto Moreira, Gerhard Krieger und Manfred Zink, die ich hier stellvertretend für viele andere explizit nenne. Zink ist Leiter der Abteilung Satelliten-SAR-Systeme und gleichzeitig Projektleiter des Tandem-Bodensegments. Weitere Informationsquellen und Originalliteratur Literatur findet man im Internet z.b: EO-Portal:TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurement) mit weiteren Literaturangaben ElevationMeasurement.html DLR Blog Tandem-X: / Webseite des Instituts für Hochfrequenztechnik und Radarsysteme: 3
4 7.7.1 TerraSAR-X Satellite Launched on June 15, 2007 Thrusters Solar Generator X-Band Radar Antenna 384 Transmit/Receive Modules S-Band TM/TC Antenna X-Band Downlink Antenna 4
5 TerraSAR-X A National Science Mission with Commercial Potential Public Private Partnership DLR - Project Management - G/S Development & Ops - Science Coordination EADS Astrium - Platform Development - Instrument Development - Launch on Dnepr (2006) Infoterra - Service Infrastructure - Information Products - Commercial Exploitation Main Mission Goals: Provision of TerraSAR-X data for scientific applications Commercial exploitation of TerraSAR-X data public interest by industry 5
6 antenna dimension in azimuth antenna dimension in elevation azimuth beamwidth 0.33 elevation beamwidth 2.3 scan angle azimuth ± 0.75 scan angle elevation ± m m center frequency Tx bandwidth PRF transmit duty cycle radiated peak power 9.65 GHz (X-band) up to 150 MHz (300 exp.) 3 KHz to 6,5 KHz 13-20% 2260 W 6
7 TerraSAR X Payload Key Specifications Center frequency 9.65 GHz Duty Cycle Stripmap /% 18 Antenna size (az. x el.) 4.78 m x 0.70 m Duty Cycle Spotlight /% 20 Scan range (az., el.) 0.75, ± 19.2 System Noise/dB 5.0 Incidence angle range Operational PRF/kHz 3 6,5 Radiated peak power 2260 W Chirp bandwidth/mhz
8 TerraSAR-X Orbit sunlight side night side dusk/down orbit altitude at equator km inclination sun-synchronous repeat orbit: repeat period 11 days revisit time: 4.5 days (100%) 2.5 days (95%) orbits per day 15 2/11 8
9 Antennas Determine Spaceborne Microwave Remote Sensing TerraSAR-X Mission Profile S-Band TM & TC X-Band Downlink 300 Mbit/sec DLR GS Neustrelitz Raw Data Acquisition DLR GS Weilheim Mission Operations DLR Oberpfaffenhofen 9
10 TerraSAR-X High geometric and radiometric resolution with an experimental very high resolution 300 MHz mode Dual-Polarization mode where two of the possible polarizations (HH & VV, HH &HV or VV & HV) can be acquired simultaneously Long term observation with the opportunity for multi-temporal imaging Precise attitude and orbit control and determination as well as phase stability e.g. for Repeat-Pass Interferometry High synergy potential with other frequency bands (L-Band: ALOS, TerraSAR-L, C-Band: ASAR, RadarSAT) New imaging modes like sliding/ starring Spotlight beside ScanSAR Full operator access to the highly flexible active phased array antenna for the realization of new imaging modes and the acquisition of custom designed image product 10
11 11
12 TerraSAR in Orbit 12
13 ScanSAR Mode 13
14 Stripmap Mode 14
15 Spotlight Mode Dualpol Hires-Spotlight Mode 15
16 TerraSAR: SpotLight-, StripMap-, ScanSAR-Examples Resolution: 1m Resolution: 3m Resolution: 16m 16
17 TerraSAR - X versus Tandem - X SAR System Parameters of both Systems fully compatible allowing both Independent TanDEM-X Operation in a Monostatic Mode Synchronised Operation in a Bistatic Mode Main Differences More sophisticated Propulsion System of TanDEM-X allows for Constellation Control Additional S-band Receiver enables for Reception of Status & GPS Position Information broadcast by TerraSAR-X X-band Inter-Satellite Link for Phase Referencing between both Radars (resp. Modifications on TerraSAR-X already implemented). Tandem Memory 705 GB double Capacity of TerraSAR 17
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