Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1998-01-21
2000-09-05
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342451, 34235704, 701207, 701222, 701226, G01S 302
Patent
active
061149950
ABSTRACT:
A computer-implemented method and apparatus for determining position of a vehicle within 100 km autonomously from magnetic field measurements and attitude data without a priori knowledge of position. An inverted dipole solution of two possible position solutions for each measurement of magnetic field data are deterministically calculated by a program controlled processor solving the inverted first order spherical harmonic representation of the geomagnetic field for two unit position vectors 180 degrees apart and a vehicle distance from the center of the earth. Correction schemes such as a successive substitutions and a Newton-Raphson method are applied to each dipole. The two position solutions for each measurement are saved separately. Velocity vectors for the position solutions are calculated so that a total energy difference for each of the two resultant position paths is computed. The position path with the smaller absolute total energy difference is chosen as the true position path of the vehicle.
REFERENCES:
patent: 5614913 (1997-03-01), Nichols et al.
patent: 5957982 (1999-09-01), Hughes et al.
M. Challa, G. Natanson, D. Baker and J. Deutschmann, "Advantages of Estimating Rate Corrections During Dynamic Propagation of Spacecraft Rates--Applications to Real-Time Attitude Determination of SAMPEX." Proceedings of the Flight Mechanics/Estimation Theory Symposium 1994, NASA Conference Publication No. 3265, pp. 481-495, NASA Goddard Space Flight Center, Greenbelt MD, May 1994.
Blum Theodore M.
The United States of America as represented by the Administrator
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