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Alfriend, Terry
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Education
1967 PhD - Va. Tech., Engineering Mechanics
1964 MS - Stanford University - Engineering Mechanics
1962 BS - Va. Tech. - Engineering Mechanics
Areas of Interest
Astrodynamics
Satellite Altitude Dynamics and Control
Space Debris
Space Surveillance
Space Systems Engineering
Awards and Honors
2005 - AAAS International Scientific Cooperation Award
1999 - Elected to the National Academy of Engineering
1998 - AIAA Mechanics and Control of Flight Award
1989 - AAS Dirk Brouwer Award
1988 - Elected Fellow, AIAA
2005 - Appointed to the Air Force Institute of Technology Board of Visitors
2004 - Appointed to the USAF Air University Board of Visitors
2004 - Best Paper Award, AAS/AIAA Space Flight Mechanics Conference, Feb. 2004
2004 - Chair, AAS Space Flight Mechanics TC, 2004-2005
2003 - Elected charter member of the Texas Academy of Science, Engineering and Medicine
2002 - Keynote Speaker, Nonlinear Problems in Aviation and Aerospace
2001 - Best Paper Award, AAS/AIAA Space Flight Mechanics Conference, Feb. 2001
2000 - Appointed the Wisenbaker II Chair Professor of Aerospace Engineering
2000 - Keynote Lecture – US-European Workshop on Celestial Mechanics, Posnan, Poland, July 3-7, 2000
2000 - Keynote Speaker, 1st International Conference on Astronautics and Aeronautics, Harbin, China, June 6-9, 2000.
1998 - Elected member of the International Academy of Astronautics
1998 - Keynote Speaker, 1998 Nonlinear Problems in Aviation and Aerospace Conference
1998 - Appointed Associate Editor, International Journal of Celestial Mechanics and Dynamical Astronomy, 1998-
1997 - Member of NAS/NRC Panel for Space Shuttle Operations With Respect to Space Debris
1991 - Appointed Editor-in-Chief of the AIAA J. of Guidance, Control and Dynamics, 1991-1995
1990 - Chair, AIAA Astrodynamics TC, 1990-1992
1985 - Elected Fellow, AAS
1985 - Appointed Editor-in-Chief of the AAS J. of the Astronautical Sciences, 1985-1988
1984 - Elected Associate Fellow, AIAA
1983 - Appoined Associate Editor of the AAS J. of the Astronautical Sciences, 1983-1985
1981 - Navy Meritorious Civilian Service Award
1981 - Editorial Board of the Int. J. of Celestial Mechanics, 1981-1986
1980 - Appointed Associate Editor of the AIAA J. of Guidance, Control and Dynamics, 1980-1982
1978 - NRL Best Paper Award
1973 - NRC/NAS Senior Postdoctoral Resident Research Associateship
1970 - NASA/ASEE Summer Faculty Fellowship
Publications and Papers
2007 Alfriend, K.T., Sabol, C. and Tombasco, J., “Orbit Determination and Prediction for Low Earth Orbit Satellites Using A Single Pass Of Observation Data,” Paper No. AAS 07-121, 2007 AAS/AIAA Space Flight Mechanics Conference, Sedona, AZ, 28 Jan. - 1 Feb. 2007. 2007 Yan, H., Ross, I.M. and Alfriend, K.T., “Pseudospectral Feedback Control for Three-Axis Magnetic Stabilization in Eccentric Orbits, “to appear in AIAA J. of Guidance, Control and Dynamics. 2006 Cefola, P.J. and Alfriend, Kyle T., “Sixth US/Russian Space Surveillance Workshop,” AIAA 2006-6673, AIAA/AAS Astrodynamics Conference, Keystone, CO, Aug. 2006 2006 Breger, L., How, J. and Alfriend, K.T., Partial J2 Invariance for Spacecraft Formations,” Paper No. AIAA 2006-6585, AIAA/AAS Astrodynamics Conference, Keystone, CO, Aug. 2006 2006 Yurasov, V.S., Nazarenko, A.I., Cefola, P. J., and Alfriend, K. T.,” Direct Density Correction Method: Review of Results,” 57th IAF Congress, Valencia, Spain, Oct. 2006 2006 Alfriend, K.T., Lee, D-J. and Creamer, N.G.,” Optimal Servicing of Geosynchronous Satellites,” to AIAA J. of Guidance, Control and Dynamics, Vol. 29, No. 1, Jan-Feb. 2006, pp. 203-206. 2006 Yan, H. and Alfriend, K.T., “Numerical Searches of J2 Invariant Orbits,” Paper No. AAS 06-164, 2006 AAS/AIAA Space Flight Mechanics Conference, Tampa, FL, 22-25 January 2006. 2005 Gim, D-W and Alfriend, K.T., “Satellite Relative Motion Using Differential Equinoctial Elements,” Int. J. of Celestial Mechanics and Dynamical Astronomy, Vol. 92, No. 4,2005, pp. 295-336. 2005 Alfriend, K.T. and Yan, H., “An Evaluation and Comparison of Relative Motion Theories,” AIAA J. of Guidance, Control and Dynamics, Vol. 26, No. 2, March-April-2005, pp. 254-263. 2005 Yurasov, V., Nazarenko, A., Cefola, P. and Alfriend, K.T., “Density Corrections For the NRLMSIS-00 Atmosphere Model, AAS 05-168, 2005 AAS/AIAA Space Flight Mechanics Conference, Copper Mountain, CO, Jan. 2005. 2005 Yurasov, V., Nazarenko, A., Alfriend, K.T. and A., Cefola, P., “Reentry Time Prediction Using Atmospheri? Density Corrections,” Fourth European Conference On Space Debris, Darmstadt, Germany, March 2005. 2005 Yan, H., Alfriend, K.T., and Ross, I. M., Three-Axis Magnetic Attitude Control Using Pseudospectral Control Law,” Paper No. AAS 05-417, 2005 AAS/AIAA Astrodynamics Conference, Lake Tahoe, CA, Aug. 7-11, 2005. 2005 Yurasov,V.S., Nazarenko,A.I., Alfriend,K.T. and Cefola, P.J.,”Review of Results on Atmospheric Density Corrections,” 6th US Russian Space Surveillance Workshop, St. Petersburg, Russia, 22-26 August 2005. 2005 Alfriend, K.T. and Lee, D-J., “Nonlinear Bayesian Filtering For Orbit Determination and Prediction,” 6th US Russian Space Surveillance Workshop, St. Petersburg, Russia, 22-26 August 2005. 2004 Yan, H., Sengupta, P., Vadali, S.R. and Alfriend, K.T., “Development of a State Transition Matrix for Relative Motion Using the Unit Sphere Approach,” Paper No. AAS 04-163, 2004 AAS/AIAA Space Flight Mechanics Conference, Wailea, HI, Feb. 2004. 2004 Sabol, C., Luu, K.K., and Alfriend, K.T., “High Accuracy Orbit Updates Using Angles-Only Data,” Paper No. AAS 04-198, 2004 AAS/AIAA Space Flight Mechanics Conference, Wailea, HI, Feb. 2004. 2004 Lee, D-J., Alfriend, K.T., “Adaptive Sigma Point Filtering For State and Parameter Estimation,” Paper No AIAA 2004-5101, 2004 AIAA/AAS Astrodynamics Conference, Providence, RI, Aug. 2004. 2004 Alfriend, K.T., Sabol, C. and Luu, K.K., “Orbit Update Comparison Using Optical and Radar Systems,” 2004 AMOS Conference, Wailea, HI, Sept. 2004. 2003 Vaddi, S.S., Vadali, S.R. and Alfriend, K.T., “Formation Flying: Accommodating Nonlinearity and Eccentricity Perturbations,” AIAA J. of Guidance, Control and Dynamics, Vol. 26, No. 3, March April 2003, pp. 214-223. 2003 Gim, D-W and Alfriend, K.T., “The State Transition Matrix of Relative Motion for the Perturbed Non-Circular Reference Orbit,” AIAA J. of Guidance, Control and Dynamics, Vol. 26, No. 6 Nov-Dec 2003, pp 956-971 Link
2003 Alfriend, K.T. and Lovell, T.A., “Error Analysis of Satellite Formations In Near Circular Low Earth Orbits,” Paper No. AAS 03-651, 2003 AAS/AIAA Astrodynamics Conference, Big Sky, MT, Aug. 2003. 2003 Carpenter, J.R. and Alfriend, K.T., “Navigation Guidelines for Orbital Formation Flying,” 2003 AIAA Guidance and Control Conference, Austin, TX Aug. 2003. 2001 Vadali, S.R., Alfriend, K.T. and Vaddi, S., “A New Concept for Constellation Control of Formation Flying Satellites,” Paper No. AAS 01-218, AAS/AIAA Space Flight Mechanics Conference, Santa Barbara, CA, Feb 11-16, 2001. 2000 Schaub, H., Alfriend, K.T. and Vadali, S.R., “Spacecraft Formation Flying Control Using Mean Orbit Elements,” J. of the Astronautical Sciences, Vol. 48, No. 1, January-March 2000, pgs 69-87. 1983 Alfriend, K.T. and Coffey, S.L., “Elimination of the Perigee in the Artificial Satellite Problem,” Celestial Mechanics, Vol. 7, 1983.
2007 Sengupta, P., Vadali, S.R. and Alfriend, K.T., Second Order State Transition Matrix For Relative Motion Near Perturbed Elliptic Orbits,” Int. J. Of Celestial Mechanics and Dynamical Astronomy, Vol. 97, 2007, No. 1, pp. 101-129 2007 How, J.P., Breger, L., Megan, M., Alfriend, K.T. and Carpenter, J.R., “Differential Semi-Major Axis Estimation Performance Using Carrier-Phase Differential GPS Measurements, AIAA J. of Guidance, Control and Dynamics, Vol. 30, No. 2, March-April 2007, pp. 301-313 2007 Yan, H. and Alfriend, K.T., “Approximate Minimum Energy Control for Linearized Systems,” to appear in AIAA J. of Guidance, Control and Dynamics. 2007 Lee, D.-J. and Alfriend, K.T., “Sigma Point Filtering for Efficient Orbit Estimation,” AIAA J. of Spacecraft and Rockets. Vol. 44, No. 2, March-April 2007, pp. 388-398. 2001 Schaub, H. And Alfriend, K.T., “J2 Invariant Orbits for Spacecraft Formations,”Celestial Mechanics and Dynamical Astronomy, Vol. 79, 2001, pp. 77-95. 2001 Alfriend, K.T. and Schaub, , H., “Dynamics and Control of Formation Flying Satellites: Challenges and Some Solutions,”J. of the Astronautical Sciences, Vol. 48, No. 2, 2001, pgs. 249-267 2000 Akella, M.R. and Alfriend, K.T., “The Probability of Collision Between Space Objects”, AIAA Journal of Guidance, Control and Dynamics, Vol. 23, No. 5, pgs. 769-772, September 2000 1999 Alfriend, K.T., Akella, M.R., Lee, D.-J., Wilkins, M., Frisbee, J, Foster, J.L., “Probability of Collision Error Analysis”, International Journal of Space Debris,vol1,1999, pp. 21-35. 1998 Beaulieu, M.R., Alfriend, K.T., and Jerardi, T., “Launch Detection System Engineering Error Analysis,” AIAA Journal of Spacecraft and Rockets, Vol.35, No.4, July 1998, pp. 487-495 1998 Junkins, J.L., Akella, M. R., Alfriend, K.T., “Some Consequences of Force Model Uncertainty On Probability of Collision With Orbital Debris”, Journal of the Chinese Society of Mechanical Engineers, Vol. 19, No. 1, Feb.1998. 1996 Alfriend, K.T., “Estimation of the Space Object Population Using a Non-Vertical Staring Radar”, Journal of the Astronautical Sciences,, May-June 1996. 1996 Ross, I.M. and Alfriend, K.T., “Low Earth Orbit Maintenance: Reboost versus Thrust Drag Cancellation”, AIAA Journal of Guidance, Control and Dynamic, Vol. 18, No. 4, July-August 1996. 1996 Chang, C.O., Liu, L.Z., Alfriend, K.T., “Dynamics and Stability of a Spinning Spacecraft Containing a Nutation Damper,” AIAA Journal of Guidance, Control and Dynamics, Vol. 19, No. 2, pp. 297-305, March-April 1996. 1996 Junkins, J.L., Akella, M.R., and Alfriend, K.T., “Non-Gaussian Error Propagation in Orbital Mechanics,” Vol. 44, No. 4, Oct.-Dec. 1996, pp. 541-563. 1994 Alfriend, K.T. and Lewis, D.L., “Estimation of the Low Earth Orbit Space Object Population and Distribution”, AIAA Journal of Spacecraft and Rockets, January 1994. 1990 Longman, R. and Alfriend, K.T., “Energy Optimal Degree of Controllability and Observability for Regualr and Maneuver Problems,” Journal of Astronautical Sciences, January 1990. 1984 Coffey, S.L. and Alfriend, K.T., “AOPP, an Analytic Orbit Prediction Program,” Journal of Guidance and Control, February 1984. 1983 Spencer, T. and Alfriend, K.T., “Comparison of Filled and Partly-Filled Fluid Ring Nutation Dampers,” Journal of Astronautical Sciences, Vol. XXXI, April 1983. 1981 Longman, R. and Alfriend, K.T., “Actuator Placement from Degree of Controllability Criteria for Regular Slewing of Flexible Spacecraft,” Acta Astronautical, Vol. 8, 1981. 1979 Longman, R. and Alfriend, K.T., “Optimal Control of Large Angle Attitude Maneuvers for Flexible Spacecraft,” Automatica. 1978 Kaufman, B., Alfriend, K.T., and Dasenbrock, R., “Luni-solar Perturbations in the Extended Phase Space Representation of the Vinti Problem,” Acta Astronautica, Vol. 5, 1978. 1978 Alfriend, K.T. and Lindberg, R.E., “Geomagnetic Field Effects on the Design of a Magnetic Attitude Control System,” Journal of Astronautical Sciences, Vol. 5, 1978. 1977 Alfriend, K.T., Deprit, A., Dasenbrock, R., and Pickard, H., “The Extended Phase Space Formulation of the Vinti Problem,” Celestial Mechanics Journal, Vol. 16, 1977. 1976 Alfriend, K.T. and Velez, C.E., “The Application of General Perturbation theories to the Artificial Satellite Problem,” Acta Astronautica, 1976. 1976 Stickler, C. and Alfriend, K.T., “An Elementary Magnetic Control System,” Journal of Spacecraft and Rockets, Vol. 13, May 1976. 1975 Alfriend, K.T., “A Magnetic Attitude Control System for Dual Spin Satellites,” AIAA Journal, Vol. 13, May 1975. 1975 Alfriend, K.T., “A Method for Evaluating Gravity Effects in the Testing of nutation Dampers,” Journal of Spacecraft and Rockets, Vol. 12, June 1975.
2007 Yan, Hui. And Alfriend, K.T., “Optimal Formation Flying Design,” Paper No. AAS 07-199, 2007 AAS/AIAA Space Flight Mechanics Conference, Sedona, AZ, 28 Jan. - 1 Feb. 2007 2007 Wilkins, M.P., Sabol, C., Cefola, P.J. and Alfriend, K.T., “Improving Dynamic Calibration of the Atmosphere,” Paper No. AAS 07-185, 2007 AAS/AIAA Space Flight Mechanics Conference, Sedona, AZ, 28 Jan. - 1 Feb. 2007. 2007 Wilkins, M.P., Sabol, C., Cefola, P.J. and Alfriend, K.T., “Validation and Application of Corrections to the NRLMSISE-00 Atmospheric Density Model,” Paper No. AAS 07-184, 2007 AAS/AIAA Space Flight Mechanics Conference, Sedona, AZ, 28 Jan. - 1 Feb. 2007. 2007 Sabol,C., Alfriend, K.T. and Wiese, D., “Angles Only Updates for Low Earth Orbit Satellites,” AIAA J. of Guidance, Control and Dynamics, Vol. 30, No. 2, March-April 2007, pp. 314-321. 2006 Alfriend, K.T. and Wiese, D., “Angles Only Updates for Low Earth Satellites,” Paper No. AAS 06-138, 2006 AAS/AIAA Space Flight Mechanics Conference, Tampa, FL, 22-25 January 2006. 2006 Yan, H. and Alfriend, K.T., “Three-Axis Magnetic Attitude Control Using PseudoSpectral Control Law In Eccentric Orbits,” Paper No. AAS 06-103, 2006 AAS/AIAA Space Flight Mechanics Conference, Tampa, FL, 22-25 January 2006. 2006 Wilkins, M.P., Sabol,C., Cefola, P.J. and Alfriend, K.T.., “Practical Challenges In Implementing Atmospheric Density Corrections to the NRLMSISE-00 Model,” Paper No. AAS 06-170, 2006 AAS/AIAA Space Flight Mechanics Conference, Tampa, FL, 22-25 January 2006. 2005 Vaddi, S.S., Alfriend, K.T. and Vadali, S.R., “Suboptimal Formation Establishment and Reconfiguration Using Impulsive Control,” AIAA J. of Guidance, Control and Dynamics, Vol. 26, No. 2, March-April-2005, pp. 262-268. 2005 Yan, H., Fleming, A., Ross, I.M., and Alfriend, K.T., “Time Optimal Magnetic Attitude Control Toward Real Time Applications,” AAS 05-233, 2005 AAS/AIAA Space Flight Mechanics Conference, Copper Mountain, CO, Jan. 2005. 2005 L105. Lee, D.-J., Alfriend, K.T., Park, K.-J. and Mortari, D., Sequential Attitude Estimation Using Particle Filters,” Paper No. AAS 05-265, 2005 AAS/AIAA Astrodynamics Conference, Lake Tahoe, CA, Aug. 7-11, 2005. 2005 Yurasov, V., Nazarenko, A., Cefola, P..J. and Alfriend, K.T., , “Application of the ARIMA Model To Analyze and Forecast Time Series of Density Corrections for NRLMSIS-00, Paper No. AAS 05-256, 2005 AAS/AIAA Astrodynamics Conference, Lake Tahoe, CA, Aug. 7-11, 2005. 2005 Lee, D.-J. and Alfriend, K.T., “Sigma Particle Filtering for Spacecraft Attitude Estimation,” Paper No. AAS 05-266, 2005 AAS/AIAA Astrodynamics Conference, Lake Tahoe, CA, Aug. 7-11, 2005. 2005 Yan, H., Lee., D.-J., Alfriend, K.T. and Ross, I. M., “Real-Time Outer and Inner Loop Control Using DIDO, Paper No. AAS 05-353, 2005 AAS/AIAA Astrodynamics Conference, Lake Tahoe, CA, Aug. 7-11, 2005. 2005 Storch, T.A., Wiesel, W.E., Sabol, C., Alfriend, K.T. and Luu, K.K., “Maneuver Estimation Model for Relative Orbit Determination, Paper No. AAS 05-405, 2005 AAS/AIAA Astrodynamics Conference, Lake Tahoe, CA, Aug. 7-11, 2005. 2005 Yurasov,V.S., Nazarenko,A.I., Cefola, P.J., and Alfriend,K.T., “Application of the ARIMA Model To Analyze and Forecast the Time Series of Density Corrections of NRL MSIS-00, 6th US Russian Space Surveillance Workshop, St. Petersburg, Russia, 22-26 August 2005. 2005 Thrall, M., Alfriend, K.T., Kelecy and Sabol, C. “Orbit Determination Using the Raven Telescope For Highly Eccentric Orbits,” 2005 AMOS Conference, Wailea, HI, Sept. 2005. 2005 Carpenter, J.R. and Alfriend, K.T., “Navigation Guidelines for Orbital Formation Flying,” AAS J. of the Astronautical Sciences, 2005. 2004 Yurasov, V., Nazarenko, A., Cefola, P. and Alfriend, K.T., “Results and Issues of Atmospheric Density Correction,” AAS J. of the Astronautical Sciences, Vol. 52, No. 3, July-Sept. 2004, pp. 281-300. (Selected as Conference Best Paper) 2004 Sengupta, S., Vadali, S.R. and Alfriend, K.T., “Modeling and Control of Satellite Formations in High Elliptic Orbits,” AAS J. of the Astronautical Sciences, Vol. 52, No. 1, January-March 2004 2004 Vadali, S.R., Bae, H. and Alfriend, K.T., “Control of Libration Point Satellites,” Paper No. AAS 04-161, 2004 AAS/AIAA Space Flight Mechanics Conference, Wailea, HI, Feb. 2004. 2004 Alfriend, K.T., Sabol, C. and Luu, K.K., “Comparison of Optical and Radar Tracking For Catalog Maintenance,” Paper No. AAS 04-197, 2004 AAS/AIAA Space Flight Mechanics Conference, Wailea, HI, Feb. 2004. 2004 Gim. D.-W. and Alfriend, K.T., “Criteria for Best Configuration and Sub-Optimal Reconfiguration For the MMS Mission,” Paper No. AAS 04-152, 2004 AAS/AIAA Space Flight Mechanics Conference, Wailea, HI, Feb. 2004. 2004 Mitchell, M., Breger, L., How, J. P. and Alfriend, K.T., “Effects of Navigation Filter Properties On Formation Flying Control,” Paper No AIAA 2004-5024, 2004 AIAA/AAS Astrodynamics Conference, Providence, RI, Aug. 2004. 2004 How, J., Alfriend, K.T., Breger, L. and Mitchell, M., “Semi-major Axis Estimation Strategies”, 2nd International Formation Flying Symposium,” Washington, DC, September 2004 2003 Lee, D.-J. and Alfriend, K.T., No, T.S., Baek, J.-B., Lee, S.R. and Kim, H.J., “Precise Onboard Ephemeris Propagation Method Using CW Frame and Multiple Compression, AIAA J. of Guidance, Control and Dynamics, Vol. 26, No. 5,Sept.-Oct. 2003, pp. 781-785 2003 Lee, D-J., Alfriend, K.T., “Precise Real-Time Satellite Orbit Estimation Using the Unscented Kalman Filter,” Paper No AAS 03-230, AAS/AIAA Space Flight Mechanics Symposium, Ponce, Puerto Rico, Feb. 2003, Advances in the Astronautical Sciences, Vol. 114, Part 3, pp. 853-1872. 2003 Lee, D-J., Alfriend, K.T., “Sigma Point Filters For Efficient Orbit Estimation,” Paper No AAS 03-525, 2003 AAS/AIAA Astrodynamics Conference, Big Sky, MT, Aug. 2003, Advances in the Astronautical Sciences, Vol. 116, Part 1, pp. 349-372. 2003 Alfriend, K.T., Vaddi, S.S. and Lovell, T.A., “Formation Maintenance for Low Earth Near-Circular Orbits,” Paper No. AAS 03-652, 2003 AAS/AIAA Astrodynamics Conference, Big Sky, MT, Aug. 2003. 2003 Alfriend, K.T. and Lim, Jong-Il, “Performance of a Dynamic Algorithm For Processing Uncorrelated Tracks,” 5th US/Russian Space Surveillance Workshop, St. Petersburg, RUSSIA, 24-27 Sept. 2003. 2003 Vaddi, S.S., Alfriend, K.T. and Vadali, S.R., “Suboptimal Formation Establishment and Reconfiguration Using Impulsive Control,” Paper No. AAS 03-590, 2003 AAS/AIAA Astrodynamics Conference, Big Sky, MT, Aug. 2003 2003 Lee, D.J. and Alfriend, K.T., “Sigma Point Kalman Filters for Efficient Orbit Estimation in Space Surveillance,” 5th US/Russian Space Surveillance Workshop, St. Petersburg, RUSSIA, 24-27 Sept. 2003. 2002 Vadali, S.R., Vaddi, S.S. and Alfriend, K.T., “An Intelligent Control Concept for Formation Flying Satellite Constellations,” Journal of Nonlinear Control. 2002 Alfriend, K.T. and Paik, S., “Comparison of the Russian and US Algorithms for Catalog Maintenance for Geosynchronous Satellites,” Paper No. AAS 02-194, 2002 AAS/AIAA Space Flight Mechanics Conference, San Antonio, January 26-29, 2002. 2002 Vaddi, S.S., Vadali, S.R. and Alfriend, K.T., “Approximate Models for Spacecraft Relative Motion Analysis, Paper No. AAS 02-184, 2002 AAS/AIAA Space Flight Mechanics Conference, San Antonio, January 26-29, 2002. 2002 Alfriend, K.T. and Schaub, H., “Hybrid Coordinate and Orbit Element Feedback Law for Formation Flying Spacecraft,” AIAA J. of Guidance, Control and Dynamics, Vol. 25, No.2, March-April, 2002, pp. 387-393. 2002 Alfriend, K.T., Gim, D-W. and Vadali, S.R., “The Characterization of Formation Flying Satellite Relative Motion Orbits,” Paper No. AAS 02-143, 2002 AAS/AIAA Space Flight Mechanics Conference, San Antonio, January 26-29, 2002. 2002 Wilkins, M.P., Subbarao, K., Alfriend, K.T. and Vadali, S.R. “Modeling and Simulation of Power Sail,” Paper No. AAS 02-145, 2002 AAS/AIAA Space Flight Mechanics Conference, San Antonio, January 26-29, 2002. 2002 Alfriend, K.T., Yang, J-H. and Lee, D.J. and Frisbee, J.H., “The Effect of the Periodic Covariance Variations on the Probability of Collision,” Paper No. AAS 02-118, 2002 AAS/AIAA Space Flight Mechanics Conference, San Antonio, January 26-29, 2002. 2002 Alfriend, K.T. and Vadali, S.R., “Dynamics and Control of Formation Flying Satellites,” presented at the Astrodynamics Workshop portion of the Geometric Mechanics and Symmetry Workshop, University of Warwick, Coventry, UK, April 2002. 2002 Naik, K., Wilkins, M.P., Vadali, S.R. and Alfriend, K.T. “Modeling and Control of a Power Sail,” AIAA 2002-4567, 2002 AIAA Astrodynamics Conference, Monterey, CA, Aug. 5-8, 2002. 2002 Wilkins, M.P., Subbarao, K., Alfriend, K.T. and Vadali, S.R. “Modeling and Simulation of Power Sail,” AIAA 2002-4519, 2002 AIAA Astrodynamics Conference, Monterey, CA, Aug. 5-8, 2002. 2002 Alfriend, K.T. and Yan, H., “Nonlinear Considerations In Satellite Formation Flying,” Paper No. AIAA 2002-4741, 2002 AIAA Astrodynamics Conference, Monterey, CA, Aug. 5-8, 2002. 2002 Alfriend, K.T.,”Design of Formation Flying Missions in Low Earth Orbit,” Invited talk for the Space Days Workshop, Univeristy of Paderborn, Paderborn, Germany, September 30, October 1, 2002. 2002 Alfriend, K.T. and Yan, H., “An Orbital Elements Approach to the Nonlinear Formation Flying Problem,” International Formation Flying Symposium, Toulouse, France, Oct. 29-31, 2002. 2002 Alfriend, K.T., McLaughlin, C. and Lovell. T.A.., “Analysis Of Reconfiguration Algorithms For Formation Flying Experiment,” International Formation Flying Symposium, Toulouse, France, Oct. 29-31, 2002. 2001 Schaub, H. and Alfriend, K.T., “Impulsive Formation Flying Control To Establish Mean Elements”, Journal of Guidance, Control and Dynamics, Vol. 24, No. 4, pgs. 739-745, July 2001. 2001 Vadali, S.R., Vaddi, S., Naik, K., and Alfriend, K. T., “Control of Satellite Formations,” Paper No. AIAA 2001-4028, AIAA GNC Conference, Montreal, Canada, August 6-10, 2001. 2001 Alfriend, K.T., Vadali, S.R. and Schaub, H., “Celestial Mechanics Aspects of Formation Flying Satellites”, presented at the Division of Dynamical Astronomy Annual Meeting, Houston, TX, April 23-25, 2001. 2001 Junkins, J.L., Subbarao, K., Vadali, S.R. and Alfriend, K.T., ” A Novel Control Design Methodology for Maintaining Position and Attitude of PowerSail,” Paper No. AAS 01-229, AAS/AIAA Space Flight Mechanics Conference, Santa Barbara, CA, Feb 11-16, 2001. 2001 Alfriend, K.T., Vadali and Wilkins, M.P., “Dynamics and Control of PowerSail,” Paper No. AAS 01-230, AAS/AIAA Space Flight Mechanics Conference, Santa Barbara, CA, Feb 11-16, 2001. 2000 Lee, D.J. and Alfriend, K.T., “Effect of Atmospheric Density Uncertainty on Probability of Collision”, Paper No. AAS 00-181, AAS/AIAA Space Flight Mechanics Conference, Clearwater, FL, January 24-26, 2000. 2000 Alfriend, K.T., Schaub, H. and Gim, D.W., “Gravitational Perturbations, Nonlinearity and Circular Orbit Assumption Effects on Formation Flying Control Strategies,” AAS Rocky Mountain Guidance & Control Conference, Breckenridge, CO, Feb. 3-7, 2000. 2000 Alfriend, K.T., “Formation Flying Satellites: Control By an Astrodynamicist,” presented at the 1st Int. Conference on Aeronautics and Astronautics, Harbin, PRC, June 6-9, 2000. 2000 Alfriend, K.T., “Formation Flying Satellites: Control By an Astrodynamicist,” presented at US-European Workshop on Celestial Mechanics, Posnan, Poland, July 3-7, 2000 2000 Alfriend, K.T. and Schaub, H., “Hybrid Cartesian and Orbit Element Feedback Law For Formation Flying Spacecraft,” Paper No. AIAA 2000-4131, presented at the AIAA Astrodynamics Specialist Conference, Denver, Co, August 2000. 2000 Wilkins, M.P., Alfriend, K.T., Coffey, S.L. and Segerman, A.M., “Transitioning From a General Perturbations to a Special Perturbations Space Object Catalog,” Paper No. AIAA 2000-4238, presented at the AIAA Astrodynamics Specialist Conference, Denver, Co, August 2000. 2000 Wilkins, M.P., Alfriend, K.T., “Characterizing Orbit Uncertainty Resulting From Atmospheric Uncertainty,” Paper No. AIAA 2000-4239, presented at the AIAA Astrodynamics Specialist Conference, Denver, Co, August 2000. 2000 Alfriend, K.T. and Paik, S., “Comparison of the US and Russian Algorithms for Catalog Maintenance for Geosynchronous Satellites,” presented at the 4th US/Russian Space Surveillance Workshop, US Naval Observatory, Washington, DC, Oct. 23-37, 2000. 1999 Alfriend, K.T., Lee, D-J, and Wilkins, M.P., “Characterizing Orbit Uncertainty Due to Atmospheric Density Uncertainty,” 14th International Conference on Space Flight Dynamics, Iguasso Falls, Brazil, Feb. 8-12, 1999. 1999 Alfriend, K.T. and Lim, J-I., “Performance of a Dynamic Algorithm For Processing Uncorrelated Tracks,” Space Control Workshop, Lincoln Laboratory, MA, April 13-15, 1999. 1999 Alfriend, K.T. and Paik, S., “Covariance as an Estimator of Orbit Prediction Error Growth for Geosynchronous Orbits,” Paper No. AAS 99-421, 1999 AAS/AIAA Astrodynamics Conference, Anchorage Alaska, August 16-19, 1999. 1999 Alfriend, K.T. and Wilkins, M.P., “Covariance as an Estimator of Orbit Prediction Error Growth in the Presence of Unknown Sensor Biases,” Paper No. AAS 99-422, 1999 AAS/AIAA Astrodynamics Conference, Anchorage Alaska, August 16-19, 1999. 1999 Alfriend, K. T. and Lim, J-I., “Performance of a Dynamic Algorithm For Processing Uncorrelated Tracks,” Paper No. AAS 99-365, 1999 AAS/AIAA Astrodynamics Conference, Anchorage Alaska, August 16-19, 1999. 1999 Vadali, S.R., Alfriend, K.T., Junkins, J.L. and Schaub, H., “Fuel Optimal Control for Formation Flying,” 1999 AIAA Guidance, Navigation and Control Conference, Portland, OR, August 1999. 1998 Alfriend, K.T., Hoots, F., Glover, R.A., France, R.G., “Single Track Covariance for Space Surveillance Sensors,” 1998 AAS/AIAA Space Flight Mechanics Conference, Monterey, CA., Feb. 9-11, 1998. 1998 Vadali, S.R., Jung, H., Alfriend, K.T., “Orbit Determination of a Tethered Satellite System Using Laser and Radar Tracking,” 1998 AAS/AIAA Space Flight Mechanics Conference, Monterey, CA., Feb. 9-11, 1998. 1998 Alfriend, K.T., Paik, S.” Covariance Performance at Geosynchronous Orbit”, presented at the Joint US/Russian Space Surveillance Workshop, US Naval Observatory, Washington, DC, Oct. 20-23, 1998. 1997 Alfriend, K.T., “A Dynamic Algorithm for UCT Processing,” Paper No. AAS 97-607, 1997 AAS/AIAA Astrodynamics Specialist Conference, Sun Valley, ID, August 1997. 1997 Junkins, J.L., Akella, M. R., Alfriend, K.T., “Some Consequences of Force Model Uncertainty On Probability of Collision With Orbital Debris”, Paper No. AAS 97-606, 1997 AAS/AIAA Astrodynamics Specialist Conference, Sun Valley, ID, August 1997. 1995 Wolfe, S.M., Alfriend, K.T. and Leonard, B.S., “Magnetic Attitude Control System for a Small Sun Pointing Satellite,” 1995 AAS/AIAA Astrodynamics Conference, Halifax, Nova Scotia, August 14-17, 1995. 1995 Alfriend, K.T., Barnds, J., Coffey, S.L. and Stuhrenburg, L., “Orbit and Attitude Estimation of a Tether Satellite System,” 1995 AAS/AIAA Astrodynamics Conference, Halifax, Nova Scotia, August 14-17, 1995. 1993 Alfriend, K.T., and Creswell, G.M., “The Flux on a LEO Satellite Due to the Space Object Population,” 1993 AAS/AIAA Astrodynamics Conference, Victoria, Canada, August 1993. 1982 Alfriend, K.T. and Coffey, S.L., “A New Analytic Artificial Satellite Theory,” 1982 AIAA/AAS Astrodynamics Conference, August 1982. 1982 Skelton, R.E., Alfriend, K.T., and Ziffer, A., “Component Cost Analysis Applied to Maneuvering Satellites,” 1982 AiAA/AAS Astrodynamics Conference, August 1982. 1981 Alfriend, K.T., Dasenbrock, R.R., Kaufman, B., and Markley, F.L., “Research on Astrodynamics at the Naval Research Laboratory,” AIAA Aerospace Sciences Conference, St. Louis, MO, January 1981. 1981 Coffey, S.L. and Alfriend, K.T., “Short Period Estimation for the Tesseral Harmonics,” AAS/AIAA Astrodynamics Conference, Lake Tahoe, Nevada, August 1981. 1981 Alfriend, K.T. and Coffey, S.L., “A Semi-Analytic Theory Based on the Elimination of the Parallax,” 32nd International Astronautical Congress, Rome, Italy, September 1981. 1981 Skelton, R.E., Alfriend, K.T., and Ziffer, A., “Model Reduction for Maneuvering Flexible Spacecraft,” 3rd Symposium on Dynamics and Control of Large Flexible Spacecraft, Blacksburg, VA, June 1981. 1981 Coffey, S.L. and Alfriend, K.T., “Development of an Analytic Artificial Satellite Theory,” lecture at the NATO Advanced Study Institute on Applications of Modern Dynamics to Celestial Mechanics and Astrodynamics, August 1981. 1981 Coffey, S.L. and Alfriend, K.T., “Orbit Theories Based on the Elimination of the Parallax,” invited paper presented at the joint US/Brazilian Symposium on the Motion of Planets and Artificial Satellites, December 1981. 1980 Longman, R. and Alfriend, K.T., “Optimal Control of Large Angle Attitude Maneuvers for Flexible Spacecraft,” Automatica, 1980, pp. 57-62 1980 Alfriend, K.T. and Longman, R., “Rotational Maneuvers of Large Flexible Spacecraft,” AAS Guidance and Control Conference, Keystone, CO, February 1980. 1980 Alfriend, K.T., Coffey, S.L., and Deprit, A., “Another Semi-Analytic Theory,” Annual Goddard Symposium on Flight Mechanics and Estimation Theory, October 1980. 1979 Alfriend, K.T. and Longman, R., “On Frequency Response Interpretations for Maneuvering Flexible Spacecraft,” 2nd Symposium on the Dynamics and Control of Flexible Spacecraft, Blacksburg, VA, June 1979. 1979 Longman, R. and Alfriend, K.T., “Actuator Placement from Degree of Controllability Criteria for Regular Slewing of Flexible Spacecraft,” 30th International Astronautical Congress, munich, Germany, September 1979. 1978 Duiven, E.M., Connell, P.E., and Alfriend, K.T., “Satellite Tracking Using GPS Measurements,” 1978 IEEE NAECON, Dayton, OH. 1977 Alfriend, K.T., “Comment on Analytical Solution for Planar Librations of a Gravity Stabilized Satellite,” Journal of Spacecraft and Rockets, Vol. 14, December 1977. 1977 Alfriend, K.T. and Lindberg, R.E., “Geomagnetic Field Effects on the Design of a Magnetic Attitude Control System,” ESA Conference on Attitude and Orbit Control Systems, Noordvick, Netherlands, October 1977. 1977 Alfriend, K.T., “Gravity Effects in the Testing of Nutation Dampers CNES-ESA Conference on Attitude Control of Space Vehicles Technological and Dynamical Problems Associated with the Presence of Liquids, September 1977. 1977 Alfriend, K.T. and Grant, D., “Rotation of a Flexible Spacecraft About the Eigenaxis,” 28th International Astronautical Congress, Prague, Czechslovakia, September 1977. 1974 Alfriend, K.T., “The Partially Fluid Filled Viscous Annular Nutation Damper,” Journal of Spacecraft and Rockets, 1974. 1974 Alfriend, K.T. and Hubert, C.L., “The Stability of a Dual Spin Satellite with Two Dampers,” Journal of Spacecraft and Rockets, Vol. 11, July 1974. 1974 Stickler, C. and Alfriend, K.T., “An Elementary Magnetic Control System,” 1974 AIAA Guidance and Control Conference, August 1974. 1973 Alfriend, K.T. and Richardson, D.L., “Third and Fourth Order Resonances in Hamiltonian Systems,” Celestial Mechanics Journal, Vol. 7, 1973. 1972 Alfriend, K.T., “A Nonlinear Stability Problem in the Three Dimensional Restricted Three Body Problem,” Celestial Mechanics Journal, 1972 1971 Alfriend, K.T., “Stability and Motion in Two Degrees of Freedom Hamiltonian Systems for Two-to-One Commensurability,” Celestial Mechanics, Vol. 3, 1971. 1971 Alfriend, K.T., “Stability and Motion in Two Degrees fo Freedom Hamiltonian Systems for Three-to-One Commensurability,” International Journal of Nonlinear Mechanics, 1971. 1971 Alfriend, K.T., “Stability and Motion about L4 for Three-to-One Commensurability,” Celestial Mechanics Journal, 1971. 1970 Alfriend, K.T., “The Stability of the Triangular Lagrangian Points for Commensurability of Order Two,” Celestial Mechanics Journal, Vol. 1, 1970. 1969 Alfriend, K.T. and Rand, R.H., “Stability of the Triangular Points in the Elliptic Restricted Problem of Three Bodies,” AIAA Journal, Vol. 7, 1969. 1969 Alfriend, K.T. and Kashiwagi, Y., “Minimum-Time Optimal Rendevous Between Neighboring Elliptic Orbits,” Journal of Optimization Theory and Applications, Vol. 4, October 1969. 1968 Kashiwagi, Y. and Alfriend, K.T., “Time Optimal Rendezvous for Elliptic Orbits,” NASA CR 1036, May 1968, also Journal of Optimization Theory and Applications,Vol. 4, No. 4, October 1969, pp. 260-276. 1968 Alfriend, K.T. and Rand, R.H., “A Perturbation Solution for the Stability of the Triangular Points in the Elliptic Restricted Problem,” Journal of the Astronautical Sciences, Vol. XV, 1968. 1967 Davis, R.T. and Alfriend, K.T., “Solutions to Van der Pol’s Equation Using a Perturbation Method,” International Journal of Nonlinear Mechanics, 1967.
