Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2006-05-25
2008-09-09
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C342S357490, C342S357490, C342S174000
Reexamination Certificate
active
07423585
ABSTRACT:
Navigation signal group delay calibration methods and systems are described. In an embodiment, a code signal generated in a navigation system platform can be measured where the code signal includes timing delay(s). An additional code signal generated in the navigation system platform can be measured where the additional code signal is designated as a timing reference signal. A differential group delay between the code signal and the timing reference signal can the be mathematically estimated in the navigation system platform to correct for an inaccurate position estimation that would result from the timing delay(s).
REFERENCES:
patent: 7221317 (2007-05-01), Tekawy et al.
K. Kovach, New User Equivalent Range Error (UERE) Budget for the Modernized Navstar Global Positioning System (GPS), Proceedings of the Institute of Navigation National Technical Meeting, p. 550-573, Jan. 2000.
D.S. Coco et al., Variability of GPS satellite differential group delay biases, IEEE Transactions on Aerospace and Electronic Systems, vol. 27(6), p. 931-938, Nov. 1991.
Tekawy, et al., “Lever Arm Correction via Curve Fitting for High Accuracy Navigation: Space Segment Approach”, Boeing Invention Disclosure, Mar. 3, 2005, 21 pages.
Takawy, “Precision Spacecraft Attitude Estimators Using an Optical Payload Pointing System”, Journal of Spacecraft and Rockets, vol. 35, No. 4, Jul.-Aug. 1996, 7 pages.
Yinger, et al., “GPS Satellite Interfrequency Biases”, ION 55th Annual Meeting, Jun. 1999, pp. 347-354.
O'Brien Kevin M
Tekawy Jonathan A
Lee & Hayes PLLC
Mull Fred H.
Tarcza Thomas H.
The Boeing Company
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