Method and apparatus for tracking the position and velocity of a

Details Method and apparatus for tracking the position and velocity of a Method and apparatus for tracking the position and velocity of a

1992-06-15

1994-09-13

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

342463, 342352, H04B 7185, G01S 502

Patent

active

053472853

ABSTRACT:
A method and system for tracking the position of at least one moving object, such as, an airborne meteorological instrument from a ground processing station by intercepting wideband spread spectrum signals transmitted from a plurality of satellites in which the code sequence of the signals is not known comprises a receiver circuit in the moving object which compresses the wideband signals received into a narrow band, removes any frequency bias with a reference oscillator having a frequency offset value, forms a narrow analog base-band and transmits to the processing station at which spectral lines are produced and compared with synthetic spectrum values to determine the identity of each satellite, the reference oscillator frequency offset value is estimated, and the location and velocity of the moving object is determined.

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MacDoran, P. F. et al, "Codeless GPS Systems for Positioning of Offshore Platforms and 3D Seismic Surveys", Navigation: Journal of The Institute of Navigation, vol. 31, No. 2, 1984, pp. 57-69.

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