Altitude aiding in a satellite positioning system
First Claim
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1. A satellite positioning receiver capable of receipt of an at least three positioning signals, comprising:
- a navigation processor that processes the at least three positioning signals and determines an at least three code phases; and
a location determined from initial digital terrain elevation data used to calculate a solution with the at least three code phases and an altitude equation derived from the initial digital terrain elevation data.
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Abstract
A satellite position system with a plurality of satellites transmitting spread spectrum signals to a satellite position system receiver that is able to determine location using three spread spectrum signals and a polynomial surface fit to digital altitude data that approximates the altitude of the satellite position system receiver.
36 Citations
34 Claims
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1. A satellite positioning receiver capable of receipt of an at least three positioning signals, comprising:
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a navigation processor that processes the at least three positioning signals and determines an at least three code phases; and
a location determined from initial digital terrain elevation data used to calculate a solution with the at least three code phases and an altitude equation derived from the initial digital terrain elevation data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of determining the location of a receiver in recipient of at least three positioning signals, comprising:
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identifying a reference location with the at least three positioning signals;
retrieving an initial height;
determining an average height along with an average height error from the initial height;
deriving at least three simultaneous equations associated with the at least three positioning signals;
solving the at least three simultaneous equations with the average height and the average height error that results in a position and a corresponding horizontal error ellipse;
fitting a two-dimensional polynomial to the corresponding horizontal error ellipse; and
solving the at least three simultaneous equations and the two dimension polynomial that results in an altitude of the satellite positioning receiver. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A satellite positioning receiver apparatus in recipient of at least three positioning signals, comprising:
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means for identifying a reference location with the at least three positioning signals;
means for retrieving an initial height;
means for determining an average height along with an average height error from the initial height;
means for deriving at least three simultaneous equations associated with the at least three positioning signals;
means for solving the at least three simultaneous equations with the average height and the average height error that results in a position and a corresponding horizontal error ellipse;
means for fitting a two-dimensional polynomial to the corresponding horizontal error ellipse; and
means for solving the at least three simultaneous equations and the two dimension polynomial that results in an altitude of the satellite positioning receiver. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A machine-readable signal bearing medium for satellite positioning receiver apparatus containing a plurality of machine-readable signals, comprising:
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means for identifying a reference location upon receipt of at least three positioning signals;
means for retrieving an initial height;
means for determining an average height along with an average height error from the initial height;
means for deriving at least three simultaneous equations associated with the at least three positioning signals;
means for solving the at least three simultaneous equations with the average height and the average height error that results in a position and a corresponding horizontal error ellipse;
means for fitting a two-dimensional polynomial to the corresponding horizontal error ellipse; and
means for solving the at least three simultaneous equations and the two dimension polynomial that results in an altitude of the satellite positioning receiver. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. A server, comprising:
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a transceiver that receives a plurality of satellite code phases;
a memory with digital terrain elevation data; and
a controller that processes the plurality of code phases and accesses the digital terrain data in memory with an initial height to determine a location indicated by the plurality of satellite codes and the digital terrain data. - View Dependent Claims (33, 34)
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Specification