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version of CV (please e-mail me for the most recent version)
Education
Ph.D. Electrical Engineering, Stanford University, April
3, 2008
M.S. Electrical Engineering, Stanford University, June 16, 2002
B.S. Electrical Engineering cum laude, Cornell University, May
28, 2000
Choate Rosemary Hall, 1996
Research interest: Remote sensing of Earth's atmosphere
using GPS Radio Occultation
Accurate measurements of our Earth's atmosphere and
ionosphere are critical for understanding climate change, particularly
atmospheric profiles of temperature and pressure with height. Altitudes
from the surface all the way up through the ionosphere are important for
monitoring climate change due to the coupling between the troposphere and
the upper atmosphere and ionosphere. This is because the amplitudes of
certain atmospheric phenomena (such as atmospheric tides) grow
exponentially with altitude, such that small-scale changes at lower
altitudes become amplified and easier to detect at higher altitudes. It is
also important that these measurements have global geographic coverage,
full diurnal and seasonal temporal coverage, and are made over decades with little
instrument bias and meaningful vertical resolution. It
sounds like a lot to expect, but the good news is: it's possible using a
remote sensing experiment called Global
Positioning System (GPS) radio occultation. And it's starting
to happen right now! The radio occultation method was
developed right
here at Stanford University in the 1960's to study planetary
atmospheres. From 1964 to today, the space-based radio occultation method
has allowed researchers to remotely retrieve temperature, pressure, and
electron density profiles from most of the planetary atmospheres in our
Solar System (New Horizons is en route to the Pluto/Charon system,
scheduled to arrive in 2015). The radio occultation method is inherently
cross-disciplinary, combining electromagnetics, geometric optics,
spacecraft engineering and dynamics, atmospheric chemistry and
composition, and atmospheric dynamics and physics. Stanford University is
also traditionally strong in the Global Positioning System field, with
globally recognized experts such as Profs.
Per Enge, Bradford Parkinson, James Spilker, and Jerry Powell. My
doctoral work and dissertation focused on radio occultation
measurements of the Martian ionosphere made with the Mars
Global Surveyor spacecraft and showed coupling between atmospheric tides
and the ionosphere on Mars. During my graduate and professional career, however,
my interest has focused on GPS radio occultation measurements of Earth's
atmosphere and ionosphere. My interests span from experiment design,
hardware development, test, and mission planning through data retrieval
and analysis as well as incorporating the measurements into numerical
models and comparing measurements with model simulations. GPS
radio occultation ranks high on the list of the National
Research Council's Decadal Survey by the Committee on Earth Science
and Applications from Space. There are over a million profiles from the
2006-launched six-satellite FORMOSAT-3/COSMIC
mission waiting for additional
analysis in the archives of facilities such as UCAR as well as
profiles from earlier single-satellite missions at facilities such as JPL
Genesis and the PI home institutions. Incorporation of GPS radio
occultation receivers onto constellations such as Iridium
NEXT and other spacecraft that would typically carry a standard GPS
spaceborne receiver (as opposed to an occultation-ready GPS receiver) are
of importance and interest, as well as their incorporation on specifically
dedicated radio occultation missions such as GeoOptics'
proposed CICERO. It is an exciting time for atmospheric science, and for
GPS radio occultation.
Additional interests
Radio occultation to study planetary atmospheres
Atmospheric dynamics, climate fingerprinting
Energy alternatives, wind energy, solar power, fuel cells
Signal propagation through gases and plasmas
Synthetic aperture radar, and radar remote sensing
Digital imaging, stereo surface imaging, computer vision
Radio wave communication systems, wireless networks
Radio-frequency circuits, digital and analog transmitters and receivers
Planetary exploration; origin and evolution of the solar system
Research
and Work Experience
August 2006 - Present: Senior Communciation Sciences Engineer, Space
Systems Loral. Design, integration, test, and analysis of RF communication system
payloads and GPS navigation systems.
September 2004 - Present: Analysis of radio occultation
refractivity profiles from the Mars Global Surveyor spacecraft,
and the CHAMP and
FORMOSAT-3/COSMIC spacecraft (Stanford, JPL
SURP grant in collaboration with UCAR).
April 2006 - August 2006: Educational associate with the
Intelligent Robotics Group at NASA
Ames. Three dimensional surface reconstruction from stereo images from helicopters (Earth),
and Mars exploration rover cameras.
January 2006 - March 2006: Teaching assistant for Stanford
electrical engineering department's Introduction to Digital Imaging (EE168)
for Prof. Zebker.
Course content and details.
March 2004 - June 2004: Teaching assistant for Stanford
electrical engineering department's Planetary Exploration (EE106)
for Prof. Fraser-Smith. Course content
and details
September 2002 - August 2004: Retrieval, characterization,
and archiving of the radio science data from Mars Global Surveyor; preparing
data for distribution.
September 2000 - August 2003: Characterizing what types of vertical
atmospheric density structures cause radio wave multipath propagation in
planetary atmospheres (for radio occultation measurements).
Summer 2001: Jet Propulsion Laboratory Planetary Sciences Summer
School. Team co-PI on a "mission" to Mars orbit to do radio science, ion,
electron, and UV spectrometry, and magnetometry with two or more
satellites.
Summer 2000: Internship at Princeton Satellite
Systems,
studying lower-layer communication protocols for inter-satellite
communication.
Summer 1999: Internship at Lucent
Technologies, in the CDMA
current engineering lab, software debugging, unit testing, updating.
Undergraduate research, 2000: With Prof. Paul
Kintner and with advisor Prof. Mike Kelley, using GPS to study signal
propagation through the atmosphere and ionosphere.
Undergraduate research, 1997-1999: With Prof. Steve Squyres
at Cornell. Designed and tested the preliminary calibration
target for the Moessbauer and APX spectrometers on the twin Mars
Exploration Rovers. The results contributed to the final flight
design. Cornell HEDS-UP team leader.
Professional Activities
Invited Speaker, February 21, 2008, Boston
University Center for Space Physics Seminar
Invited Speaker, November 20, 2007, NASA JPL Atm. Chemistry and Dynamics
Seminar
Workshop Convener, June 28, 2007, NSF Coupling, Energetics, and Dynamics
of Atmospheric Regions (CEDAR) on Earth
Invited Speaker, April 17, 2007, Space Systems Loral Company Seminar
Invited Speaker, February 15, 2007, Santa Clara University Electrical
Engineering Seminar
Honors and Awards
NASA JPL SURP grant, November 2006
Winifred Hill Boyd Graduate Fellowship, May 2006
Stanford University GSPB Award for Community Service, May 2003
Cornell University William S. Einwechter Award, May 2000
Journal Publications
Cahoy K. L., D. P. Hinson, G. L. Tyler (2007), Characterization of a semidiurnal eastward-propagating tide at high
northern latitudes with Mars Global Surveyor electron density profiles,
Geophys. Res. Lett., 34, L15201, doi:10.1029/2007GL030449.
Cahoy, K.L., D.P. Hinson, and G.L. Tyler (2006), "Radio science measurements of
atmospheric refractivity with Mars Global Surveyor," J. Geophys. Res., Vol. 111, No. E5, E05003,
10.1029/2005JE002634.
Conferences and Workshops
Cahoy, K. L., "Interannual observations of the Martian
ionosphere," talk presented at the URSI National Radio
Science Meeting, Boulder, Colorado, January 3, 2008.
Cahoy, K. L., "Seasonal and temporal variability of the
equatorial ionosphere with radio occultation electron density profiles
from CHAMP," poster, Eos Trans. AGU, 88(52), Fall Meeting
Suppl. Abstract SA13A-1063, December 10, 2007.
Cahoy, K. L., "A comparison of CHAMP and FORMOSAT-3/COSMIC
equatorial electron density profiles, talk presented at the 2nd
FORMOSAT-3/COSMIC Data Users Workshop, October 24, 2007.
Invited speaker, NASA JPL Atmsopheric Chemistry, Dynamics, and
Radiation Seminar series, "Effects of atmospheric tides on the
ionospheres of Earth and Mars," Friday November 30, 2007.
Cahoy K. L. Hinson D. P. Tyler G. L.
(2007), "Characterization of a Semidiurnal Eastward-propagating
Tide at High Northern Latitudes with Mars Global Surveyor
Electron Density Profiles," poster, #3088, Seventh
International Conference on Mars, July 11, 2007, Caltech, Pasadena, CA.
Workshop convener, "Ionospheric studies
using radio occultation electron density profiles," CEDAR-DASI
Workshop, June 28, 2007, Eldorado Hotel, Santa Fe, NM (also gave talk in
session).
Cahoy, K. L., M. de la Torre Juarez, and S. England, "Equatorial
tidal structure at F-region altitudes with electron density profiles
from CHAMP and SAC-C," poster presented at the International
Symposium on Coupling Processes in the Equatorial Atmosphere (CPEA),
Kyoto, Japan, March 22, 2007.
Invited speaker, EE 200 at Santa Clara University, "Radio
remote sensing of atmospheric tides on Mars and Earth," February
15, 2007.
Cahoy, K. L. and M. de la Torre Juarez (2006), "Comparison of
Ionospheric Electron Density Structure on Earth and Mars," poster,
Eos Trans. AGU, 87(52), Fall Meet. Suppl. SA33A-0252.
Cahoy, K. L., D. P. Hinson, and G. L. Tyler (2006), "Thermal
Tides in the Northern Hemisphere of Mars with Mars Global Surveyor Radio
Occultation Measurements," talk presented Friday, October
13, 2006 at the AAS Division for Planetary Sciences Meeting in Pasadena,
CA.
Cahoy, K. L., D. P. Hinson, and G. L. Tyler (2006), "Thermal
tides on Mars: Comparing the Mars Global Surveyor refractivity data with
the Mars Climate Database," poster presented at the European Geosciences Union General Assembly, Vienna,
Austria. Abstract published in Geophysical Research Abstracts, Vol. 8,
09553, 2006.
Cahoy,
K. L., D. P. Hinson, and G. L. Tyler (2005), “Radio science measurements of
atmospheric refractivity with Mars Global Surveyor,” poster presented on
December 5, 2005 at the American Geophysical Union meeting, San
Francisco, CA. Abstract published in Eos Trans. AGU, 86(52), Fall Meet.
Suppl., Abstract P13A-0137, 2005.
Cahoy, K.L., D.P. Hinson, and G.L. Tyler (2005),
"Radio science measurements of atmospheric refractivity with
Mars Global Surveyor," talk presented on Friday, April 29, 2005,
European Geosciences Union General Assembly, Vienna, Austria. Abstract
published in Geophysical Research Abstracts, Vol. 7, 02908, 2005.
Kusza,
K.L. and G.L. Tyler, “Representing planetary atmospheric structures
and observables with radio occultation transform pairs,” poster
presented on
December 12, 2003 at the American Geophysical Union meeting, San
Francisco, CA. Abstract published in Eos Trans. AGU, 84(46), Fall Meet.
Suppl., Abstract P51C-0466, 2003.
Kusza,
K.L., and G.L. Tyler, "Using radio occultation transform pairs to
represent atmospheric structures," poster presented on September 5, 2003
at the 35th Meeting of the Division of Planetary Sciences of the
American Astronomical Society, Vol. 35 no. 4, Fall Meeting Supplement,
abstract number 406, session 40.12, p. 996, 2003.
Kusza, K.L., "Using radio waves to study planetary atmospheres," IEEE
Potentials, 39-40, April/May 2004.
Kusza,
K.L., and G.L. Tyler, "Characterizing atmospheric multipath
propagation in dense atmospheres for radio occultation
measurements," EGS-AGU-EUG Joint Assembly, Nice France, 06-11 April
2003, poster, Geophysical Research Abstracts, Vol. 5, 2003, EGS-AGU-EUG Joint
Assembly, EAE03-A-13571 (CD), European Geophysical Society, April 2003.
Kusza,
K.L., and G.L. Tyler, "Effects of atmospheric multipath propagation
on radio occultation variables," poster presented at the American
Geophysical Union meeting, December 6-10, 2002, San Francisco, CA.
Abstract published in Eos, Trans., AGU, vol. 89, no. 47, Fall Meeting
Supplement, Abstract P71A-0456, 2002.
Kusza,
K.L. and G.L. Tyler, "Modeling multipath propagation in planetary
atmospheres for radio occultation measurements," poster presented on
October 8, 2002 at the 34th Meeting of the Division for Planetary
Sciences of the American Astrnomical Society. Abstract #18.12, Bulletin
of the American Astronomical Society Vol. 34, No. 3, p. 875.
Tyler,
G.L., K.L. Kusza*, B. Ahmad, and S. Toumpis, "Effects of atmospheric
multipath propagation on radio occultation observables and
measurements," *talk presented on August 21, 2002 at the URSI 2002
General Assembly Maastricht, the Netherlands. Abstract #1925, Oral
Presentations Programme, XXVII GA, p. 128.
Kusza,
K.L. and M.A. Paluszek, "Intersatellite links: Lower layer
protocols for autonomous constellations," paper and talk presented
on November 13, 2000 at the First Joint Space Internet Workshop, NASA
Goddard Space Flight Center, Maryland.
Leadership
Experience
AFAA certified aerobics instructor: I currently teach step, kickboxing,
conditioning for Stanford Aerobics and Yoga, and have done so since
2004.
Head Community
Associate, Stanford Graduate Life Office.
Webmaster for several Stanford University club and
department pages.
Member in professional organizations: AGU, IEEE,
AAS/DPS.
CPR, AED, first aid, and
oxygen certified, member of emergency responders team.
Skills
OS: Unix, Linux, XP, OS X, and
productivity software, e.g. Office, Adobe, LaTex.
Languages: Java, C++, C, Fortran, html, php, perl
Analysis: MATLAB, IDL, Mathematica, Microwave Studio
Proficient in German
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