OOS Design concept option 5

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Ocean Observing System Follow-On Study Option 5 Constellation Prepared by: James McGuire July 25, 2002

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Study Overview Develop an up to date requirements set for ocean observing-type sensor for the time frame 2008-2018 Science team composed of Academia, DOC, DOD, DOI, DOT, EPA, FEMA, and NSF generated a User Requirement Document (URD) Identify candidate sensors that can meet the requirements in the URD Altimeter, Scatterometer, SAR, and Hyperspectral imager suite of instruments selected to meet the requirements Develop candidate system architectures Four mission sets, varying in cost and requirements met, were defined and are being studied Identify key technologies, their state of readiness and provide priority for key technology development Generate cost estimates for the architectures and sensors

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Study Assumptions

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Study Assumptions Con’t

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Option 5 SAR Operational Modes

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C-Band Mode 1a - Ground Swath 150-130 Exceeds Specs of 100 Km Mode 2a - 10-18 Looks Does Not Meet Specs of 10-20 Looks Mode 3a - (HH, HV), (VV, VH) Options Exceeds Specs of (HH and VV) Mode 3c - ATI – “Free” Mode Mode 4 - Blend of Finest Resolution and Widest Swath Width Specifications = Exceeds Specs L-Band Mode 1c - 150-130 Km Exceeds Specs of 100 Km Mode 1c - 4 Looks Exceeeds Specs of 2 Looks Mode 2 - 10-19 Looks Exceeds Specs of 8 Looks Mode 3a - (HH, HV), (VV,VH) Exceeds Specs of (HH,VV) Mode 3c - ATI – “Free” Mode Mode 4 - 2 Looks Does Not Meet Specs of 3 Looks Deviations From SAR Performance Specifications & “Free” Modes

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Ocean Observer C & L-Bands SAR Key Parameters with 22.95m x 1.5m C-Band Antenna and 22.95m x 2.9m L-Band Antenna

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Option 5 Constellation Physical Configuration

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Synthetic Aperture Radar – Option 5 Max Swath Width: Spatial Resolution: Frequency: Antenna Size: EDRs Met T/O: 1 Sided C & L Bands + Quad Pole + ATI + RPI + CTI* Instrument Type: Mass: Peak Power: Peak Data Rate: Technology Issues: Configuration Issues: Areas for further study: 600 km 2.5m -250m C - Band - 5.35 GHz L - Band - 1.26 GHz 23m x 4.5m 21/15 900 Kg 8.4 KW 680 Mbps Inter-spacecraft comms & precision separation measurement (*during 2 year overlap w/2nd & 3rd launches) 1 spacecraft with a SAR antenna capable of being electron- ically partitioned into 2 halves with 10m separation for ATI The electronic partitioning of the array to perform ATI * Cross Track Interferometry (CTI) performed during overlap of 1st launch constellation & 2nd & again between 2nd and 3rd launches

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Coastal Color Imager & Thermal Profiler Imaging Spectrometer 150km Field of View: EDRs Met (T/O): Nadir +/- 45 deg. 17/0 Swath Width: Spatial Resolution: Spectral Region: Instrument Type: 0.1 km GSD 0.38 – 1.0 micrometer region with 64, 10nm wide bands plus 10.8 & 12 micrometer bands Mass: Peak Power: Peak Data Rate: Technology Issues: Configuration Issues: Areas for further study: QWIP IR Detectors Flight Qualified None Wider Swath Width & Finer Spatial Resolution

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Altimeter 200 km 14km x 14km 13.28 GHz & 13.575 GHz 5.3 GHz 2-2.5mx0.5m 7m apart 2/1 80 kg 370 watts 45 Kbps None – DD successfully flown on an aircraft in ’01 & is planned to be flown in space in ‘07 7 meter boom deployment and stiffness and antenna panel deployments at both ends of the boom Spacecraft stability requirements Wide Swath Altimeter w/Delayed Doppler (DD) Processing