Millimeter-Accuracy Satellite Navigation
Technical rept. 29 Apr 86-8 Apr 91,
MASSACHUSETTS INST OF TECH CAMBRIDGE
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Millimeter-accuracy satellite navigation, defined as the determination of instantaneous position coordinates of a point on a moving platform landseaairspace vehicle with respect to a reference frame defined by points fixed on the ground, with millimeter-level uncertainties, is possible using the satellite radio interferometry techniques. These techniques include use of doubly-differenced, dual-band, reconstructed-carrier phase observations of the NAVSTAR GPS satellites simultaneously from the unknown point and from fixed reference points suitably arrayed on the ground so that the integer-cycle ambiguities of their observations can be resolved to reduce satellite orbit uncertainties. For instantaneous ambiguity resolution of the moving-platform observations, at least seven satellites must be observed simultaneously. If the available number of NAVSTAR satellites is insufficient, GLONASS satellites may be used. Other options for ambiguity resolution are also available.
- Navigation and Guidance