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R. J. Muellerschoen
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Demonstration of Decimeter-level Real-time Positioning of an Airborne Platform
M. Armatys, R. Muellerschoen, Y. Bar-Sever, R. Meyer
Jet Propulsion Laboratory, California Institute of Technology
Proceedings,ION NTM-2003, Anaheim, CA
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Orbit Determination With NASA's High Accuracy Real-Time Global Differential GPS System
GPS orbits and clocks are computed in real-time with data from NASA's
global GPS network. The accuracy of the GPS orbits and reference
frame alignment to ITRF'97 is discussed. The dissemination of the
global correction message is over the Internet, and a signal-in-space
(SIS) is provided by America's Inmarsat satellite. The SIS will soon
expand for global coverage with Inmarsat's ASPAC (Asia/Pacific) and
EMEA (Europe/Africa) satellites yielding coverage over the entire
globe between +/-75 degrees in latitude. The inherent latency in
providing the corrections to the user through the geosynchronous
satellites is shown to have little impact on true real-time
positioning. Orbit determination, post-processed but filtered as if
in real-time, of a low-Earth orbiter's GPS data using the real-time
orbit and clock products will be presented. Anticipated plans call
for uploading the code to a space-qualified receiver and performing
orbit determination with the GPS differential global corrections as
transmitted by the Inmarsat beams.
R. J. Muellerschoen, A. Reichert, D. Kuang, M. Heflin, W. I. Bertiger and Y. E. Bar-Sever
Proceedings of ION GPS-2001, Salt Lake City, UT, September 2001.
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Results of an Internet-Based Dual-Frequency Global Differential GPS System
Observables from a global network of 18 GPS receivers are returned in
real-time to JPL over the open Internet. Global GPS orbits accurate to
30-40 cms RSS and precise dual-frequency GPS clocks are computed in
real-time with JPL's Real-Time Gipsy (RTG) software. Corrections to
the broadcast orbits and clocks are communicated to the user over the
open Internet via a TCP server. Tests of user positioning show real-time
RMS accuracy of 8 cms RMS in horizontal and 20 cms RMS in the vertical.
R. J. Muellerschoen, W. I. Bertiger and M. F. Lough
Proceedings of IAIN World Congress, San Diego, CA, June 2000
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A Real-Time Wide Area Differential GPS System
W. I. Bertiger, Y. E. Bar-Sever, B. J. Haines, B. A. Iijima, S. M. Lichten,
U. J. Lindqwister, A. J. Mannucci, R. J. Muellerschoen, T. N. Munson,
A. W. Moore, L. J. Romans, B. D. Wilson, S. C. Wu, T. P. Yunck, G. Piesinger,
and M. L. Whitehead
Invited Contribution to Institute of Navigation "Red Books," Global Positioning
System: Papers Published in Navigation, Vol. IV, 1999
Navigation: Journal of the Institute of Navigation, Vol. 44, No. 4, 1998,
pgs. 433-447
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An Internet-Based Global Differential GPS System, Initial Results
Using a network of 15 global GPS receivers, GPS data is returning to JPL via the
open Internet to determine the orbits and clocks of the GPS constellation in
real-time. Corrections to the broadcast orbits and clocks are currently
communicated in real-time to the user over the open Internet via a TCP server.
Tests of user positioning show real-time RMS accuracy of ~10 cms RMS in horizontal
and < 20 cms RMS in the vertical.
R. J. Muellerschoen, W. I. Bertiger, M. F. Lough, D. Stowers, D. Dong
ION National Technical Meeting, Anaheim, CA, Jan, 2000
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Flight Tests Demonstrate Sub 50 cms RMS Vertical WADGPS Positioning
Wide Area Differential GPS (WADGPS) positioning is performed in real-time during NASA's DC-8 AirSAR flights.
The goal of the experiment is to demonstrate absolute positioning in earth-fixed coordinates to better
than one meter in all components in real-time. Results show dual-frequency real-time RMS (root-mean-square)
accuracy in the vertical to be 50-60 cms with an RMS horizontal accuracy of better than 40 cms.
R. J. Muellerschoen, W. I. Bertiger and M. L. Whitehead
Proceedings of ION GPS-99, Nashville, Tenn., September 1999.
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A Close Look at Satloc's Real-Time WADGPS System GPS Solutions
M. L. Whitehead, G. Penno, W. J. Feller, I. C. Messinger,
W. I. Bertiger, R. J. Muellerschoen, and B. A. Iijima
GPS Solutions, Vol 2, No. 2, John Wiley & Sons, Inc., 1998. Invited Paper
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Incorporation of Orbital Dynamics to Improve Wide-Area Differential GPS
J. Ceva, B. Parkinson, W. I. Bertiger, R. J. Muellerschoen, and T. P. Yunck
Navigation, Summer 1997, Vol. 44, No. 2, pg. 171-180
Invited Contribution to Institute of Navigation "Red Books,"
Global Positioning System: Papers Published in Navigation,
Vol. IV, 1999.
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Precise Real-Time Positioning Using Wide Area Differential GPS, Field Tests
W. I. Bertiger, Y. E. Bar-Sever, T. J. Borden, B. A. Iijima,
R. J. Muellerschoen, T. N. Munson, A. W. Moore, L. J. Romans,
S. C. Wu, M. L. Whitehead, W. Feller, G. Penno
Proceedings of the ION National Tech. Meeting, Long Beach, CA, Jan. 1998
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Concept for a Wide-Area GPS Navigation System
W. I. Bertiger, S. M. Lichten, A. J. Mannucci, R. J. Muellerschoen, S. C. Wu, and T. P. Yunck
NASA Tech Brief, NPO-19625, June, 1997.
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A Prototype WADGPS System for Real Time Sub-Meter Positioning Worldwide
T. P. Yunck, Y. E. Bar-Sever, B. A. Iijima, S. M. Lichten, U. J. Lindqwister,
A. J. Mannucci, R. J. Muellerschoen, T. N. Munson, L. J. Romans, S. C. Wu
Proceedings of the 9th International Technical Meeting of The Institute of
Navigation, Kansas City, MO, September 17-20, 1996.
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A Prototype Real-Time Wide Area Differential GPS System
W. I. Bertiger, Y. E. Bar-Sever, B. J. Haines, B. A. Iijima, S. M. Lichten,
U. J. Lindqwister, A. J. Mannucci, R. J. Muellerschoen, T. N. Munson,
A. W. Moore, L. J. Romans, B. D. Wilson, S. C. Wu, T. P. Yunck, G. Piesinger,
and M. L. Whitehead
Proceedings of the ION National Technical Meeting, Santa Monica, CA, Jan. 1997.
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Orbit and Troposphere Results of a Real-Time Prototype WADGPS System
R. J. Muellerschoen, W. I. Bertiger, and L. J. Romans,
Proceedings of the ION National Tech. Meeting, Santa Monica, CA, Jan. 1997.
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microGPS: On-orbit Demonstration of a New Approach to GPS for Space Applications
J. Srinivasan, Y. E. Bar-Sever, W. I. Bertiger, S. M. Lichten,
R. J. Muellerschoen, T. N. Munson, D. Spitzmesser, J. Tien,
S. C. Wu, and L. E. Young
next edition of Navigation (the red book) to be published
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GRACE:Millimeters and Microns in Orbit
W. Bertiger, Y. Bar-Sever, S. Desai, C. Dunn, B. Haines, G. Kruizinga,
D. Kuang, S. Nandi, L. Romans, M. Watkins, and S. Wu
Jet Propulsion Laboratory, California Institute of Technology
S. Bettadpur, Center for Space Research
Proceedings,ION GPS-2002, Portland,OR (to be published)
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Initial Orbit Determination Results for Jason-1:
Towards a 1-cm Oribt
B.Haines, W. Bertiger, S. Desai, D. Kuang, T. Munson, L. Young, P. Willis
Jet Propulsion Laboratory, California Institute of Technology
Proceedings,ION GPS-2002, Portland,OR (to be published)
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