CALIPSO Status

Ball Aerospace & Technologies Corporation - [email protected]

BALL AEROSPACE &TECHNOLOGIES CORP.

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CALIPSO Status

Carl Weimer - Ball Aerospace & Technologies Corp.

Mike Cisewski, Yongxiang Hu, Bill Hunt, Chip Trepte, Dave Winker – NASA LaRC

Floyd Hovis - Fibertek Corp.



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CALIPSO –Introduction

• CALIPSO Satellite– Proteus Spacecraft from (CNES/Alcatel)– Payload (NASA/CNES/Ball Aerospace)

• CALIPSO Payload Instruments– Wide Field Camera – Cloud Camera matched to MODIS (645 nm, 125 m pixel)– Infrared Imaging Radiometer – Three band Thermal Images (8.65, 10.6, 12.05 µm)– CALIOP – Rayleigh-Mie Lidar (laser radar) for clouds and aerosols

• CALIOP– Two Wavelengths (532 nm and 1064 nm)– Polarization sensitive at 532 nm (Photomultiplier Detectors aligned Parallel and

Perpendicular to laser linear polarization) – Polarization Accuracy ~0.5%– Polarization insensitive at 1064 nm (single Avalanche Photodiode detector)– Sensitive to single photons at 532 nm, less sensitive at 1064 nm– Dynamic range 8 million – Vertical Resolution 30 m fixed by Analog-to-Converter clock (increases in steps to

300 m in stratosphere)– Data collected for altitudes -2 km to +40 km– Laser Footprint on ground 70 m, geolocated to better than 60m– Laser pulse emitted at 20 Hz repetition (330 m spacing between laser pulses)



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CALIPSO Satellite & Payload

Integrated Lidar Transmitter

Imaging InfraredRadiometer

Star Tracker Assembly

Wide Field Camera

Lidar Receiver Telescope



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Lidar Core – Transmitter and Receiver

ILT (Integrated Lidar Transmitter)

ILR (Integrated Lidar Receiver)

Beam Expander

Optics

Adjustable Boresight

Mechanism

Laser Optics

Modules - Fibertek

Laser Radiator

PMTs

Telescope – 1 meter Beryllium

Optical Bench

APD

Etalon Filter



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CALIPSO Laser StatusAlways the First Questioned Asked

• Completed One Billion Laser Shots On-Orbit Feb 3!

• Only have operated one laser, second laser held in reserve.



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CALIPSO Summary

• Satellite and Payload are healthy, data trends are all acceptable to meet full mission requirements

– Mission complete in May 2009, Mission extension will be applied for in January 2009

– “Single String” Satellite and many new technologies as part of this “Pathfinder” mission requires careful risk management throughout program life.

• Level 2 Science Data now being released (see http://www-calipso.larc.nasa.gov/products/)

– Includes extinction for the first time– See Dave Winker’s Working Group presentation from Feb 2007 for examples of

aerosol and cloud science data.– Validation and Calibration work is ongoing

• New Data Products and capabilities are being developed– Now providing an Expedited Data set for Science Campaigns– Working to decrease data latency to support weather and air quality users.– New Products include ocean subsurface and altimetry demonstrations (Yong Hu)



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One New Application of CALIPSO - Ocean Windspeed

• The Cox-Munk Equation relates ocean wind speed to surface reflectivity

• Was applied previously to LITE space-based lidar data by Menzies, Tratt, and Hunt

• Yong has submitted a paper showing global comparison of passive microwave system AMSR-E on Aqua to CALIPSO measured Ocean Windspeed– Preliminary results show agreement is better than 1.3 m/s rms using single

laser shots

• Trades –– Microwave systems give superior all-weather performance– CALIPSO measures over much smaller footprint (70 m vs. 20 km)– CALIPSO is calibrated using reflectivity from upper atmosphere

• Working towards using ocean surface as an independent lidar calibration and also as independent check on column aerosol extinction.



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AMSR-E Winds vs CALIPSO Winds



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Global Comparison Between CALIPSO and AMSR-E (AQUA) Wind speeds

Residual Windspeed Error for CALIPSO arises from aerosol loss. Possible instrument effects being studied.

CALIPSO Status

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