Half-dead-reckoning capable GPS navigation receiver
First Claim
1. A half-dead reckoning satellite navigation receiver comprising:
- an L-band microwave radio receiver for tracking and acquisition of two, three, four or more orbiting navigation satellites and for computing navigation solutions from the signals from the available satellites; and
a navigation computer connected to the radio receiver and that provides for navigation when only three satellites are visible by constraining the altitude, and provides for a half-dead-reckoning mode of operation when only two satellites are visible by providing a one dimensional satellite navigation solution;
wherein, 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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0 Petitions
Accused Products
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.
21 Citations
7 Claims
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1. A half-dead reckoning satellite navigation receiver comprising:
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an L-band microwave radio receiver for tracking and acquisition of two, three, four or more orbiting navigation satellites and for computing navigation solutions from the signals from the available satellites; and a navigation computer connected to the radio receiver and that provides for navigation when only three satellites are visible by constraining the altitude, and provides for a half-dead-reckoning mode of operation when only two satellites are visible by providing a one dimensional satellite navigation solution; wherein, 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. - View Dependent Claims (2, 3, 4)
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5. A method of half-dead-reckoning navigation, the method comprising the steps of:
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determining if only two orbiting navigation satellites are visible to a satellite navigation receiver; if only two orbiting navigation satellites are visible, then projecting the position of the receiver by dead reckoning; and correcting said projection in one horizontal axis only with information provided by said two visible orbiting navigation satellites. - View Dependent Claims (6, 7)
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Specification