IGARSSAirSWOTv2.ppt

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[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Outline

Ka-band SWOT Phenomenology Airborne Radar (KaSPAR) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Swath Performance ,[object Object],[object Object],[object Object],Random error across swath Parameter Value Unit Center Frequency 35.75 GHz Peak Transmit Power 40 W Platform Height 35 kft Swath Coverage “inner” “ outer” 1.4 5.0 km Bandwidth “inner” “ outer” 200 (min) 80 (min) MHz Mean height error “inner” “ outer” 1.2 * 2.3 ** cm Incidence angles “inner” “ outer” 1-5 4-27 deg

Measurements and Processing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],*all simultaneous including both “SWOT-like” and “mapping” swaths

Technology Support for SWOT: Calibration Loop ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

AirSWOT Technology Heritage and Infusion Multichannel, high-throughput digital system compatible with unpressurized unattended operation ,[object Object],[object Object],[object Object],GLISTIN slotted waveguide DBF array produced IPY/AITT antenna design. HiWRAP: IIP & NASA SBIR GLISTIN-A: IPY & AITT AirSWOT SWOT cal/val sensor: ESTO & NASA SBIR Compact integrated assembly compatible across platforms (e.g. NASA King Air, Ikhana, Global Hawk, DC8). GLISTIN: IIP

KaSPAR Development Status ,[object Object],[object Object],[object Object],[object Object]

Antenna Summary Narrow Beam Wide Beam Size 21.2 cm x 4.0 cm 21.2 cm x 14.5 cm Realized Gain 35.5 dBi 28.7 dBi HPBW: Ecut 4.0 deg 17.2 deg Hcut 3.2 deg 2.6 deg SLL: Ecut < -23 dB < -22 dB Hcut < -23 dB < -23 dBI Low CTE panel ,[object Object],[object Object]

Downconverters (4 of 7) Upconverter Transmitter IF RF Subassemblies ,[object Object],[object Object],x2 Upconverter

LO distribution Internal Calibration ,[object Object],RF Subassemblies (cont)

Solid-State Power Amplifier ,[object Object],[object Object],[object Object],[object Object]

Digital Receiver System Radar Controller / Waveform Generator 3.6 GSa/s – 12-bit ADC Board ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

AirSWOT: Payload Sensors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Map of water-land interface pixels for the Tanana River, Alaska At each red pixel, there is potential for classification error in KaSPAR data.

AirSWOT: Platform considerations P3 Gulfstream King Air GlobalHawk /C130

Initial Platform: NASA King Air B200 ,[object Object],[object Object]

Near-term plans ,[object Object],[object Object],[object Object],[object Object]

Example of Backscatter Dependence on Wind

Aircraft considerations: NASA Global Hawk ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Payload area

The backscattered power as a function of incidence angle was used to solve for the normalized radar cross-section using the radar range equation: We know the antenna pattern and we assumed the following geometric optics approximation for  0 : Where s 2 is the mean-square slope and  hs is the small scale roughness. Estimation of  0 near-nadir

Airborne Velocity Mapping ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Right: C-band radial velocity image over San Francisco bay. Pixel resolution ~10m and velocity precision ~10cm. Swath ~8-10km u B swath

KaSPAR Along-track Capability ,[object Object],[object Object],[object Object]

Processing and Products ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Variability of  0 (  i )

Swath Mapping Performance * Error Sources modeled Quantity Unit random SNR Derived from system radar-range equation for ocean at 6m/s wind Unitless ratio Geometric Derived for each baseline ISLR/MNR -13 dB Zero-range ambiguity Relative gain of 2-way antenna pattern from opposite side Unitless ratio systematic Receiver phase drift knowledge error 0.2 degrees Baseline deviation 20 microns Range timing accuracy 3 ns Mean height error performance (35kft, ocean) Inner subswath 1.8 cm Outer swath 2.3* cm

Predicted Height Accuracy for “SWOT” Subswath

Predicted Height Accuracy Across Swath

Strategies for Validation of KaSPAR Hydrologic Measurements ,[object Object],[object Object],[object Object],[object Object],Solinst Pressure Transducer Water Level Logger Setup for a pressure transducer sensor installed in a lake Examples of pressure transducer data for two river channels, Peace-Athabasca Delta, Canada Differential GPS Equipment used for surveying water levels in rivers and lakes. Sensor Viewgraph credit: Tamlin Pavelsky UNC-Chapel Hill

Strategies for Validation of KaSPAR Hydrologic Measurements ,[object Object],[object Object],[object Object],Photo courtesy USGS An Example of ADCP Data Viewgraph credit: Tamlin Pavelsky UNC-Chapel Hill

AirSWOT support for SWOT pre-mission ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Strategies for Validation of KaSPAR Hydrologic Measurements ,[object Object],[object Object],[object Object],[object Object],Map of water-land interface pixels for the Tanana River, Alaska At each red pixel, there is potential for classification error in KaSPAR data. Digital Cirrus Camera to be included on AirSWOT Viewgraph credit: Tamlin Pavelsky UNC-Chapel Hill

IGARSSAirSWOTv2.ppt

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IGARSSAirSWOTv2.ppt