Importance

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Abstract

A half-dead reckoning satellite navigation receiver comprises a receiver for tracking and acquisition of two, three, four or more satellites and for computing navigation solutions from the available satellites. A navigation computer is included that provides for navigation when only three satellites are visible by constraining the altitude. The navigation computer further provides for a half-dead-reckoning mode of operation when only two satellites are visible and the altitude is constrained by providing a one dimensional satellite navigation solution. The receiver position is projected by dead reckoning with the projection corrected in one axis only that is perpendicular to the available horizontal line of position.

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First Claim