Variable measurement rate method for positioning systems
First Claim
1. A method of variable rate measurements in a device having a position module and a rate module, comprising the steps of:
- (A) measuring both a position of said device and a velocity of said device at each of a first time and a second time in response to a plurality of navigation signals received by said position module;
(B) calculating with said rate module an extrapolated value of said position expected at said second time based on both a first value of said position and a first vector of said velocity at said first time; and
(C) adjusting an interval in said rate module between said second time and a third time in response to a difference between said extrapolated value and a second value of said position at said second time.
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Abstract
A method of variable rate measurements in a device. The method generally includes the steps of (A) generating an intermediate signal conveying both a position of the device and a velocity of the device in response to a plurality of navigation signals received from external the device, (B) calculating an extrapolated position of the device at a second time based on the position and the velocity both measured at a first time, (C) adjusting an interval between the second time and a third time in response to a difference between the extrapolated position and the position measured at the second time and (D) generating a position signal conveying the position and the velocity, wherein the third time occurs after the second time and the second time occurs after the first time.
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Citations
20 Claims
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1. A method of variable rate measurements in a device having a position module and a rate module, comprising the steps of:
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(A) measuring both a position of said device and a velocity of said device at each of a first time and a second time in response to a plurality of navigation signals received by said position module; (B) calculating with said rate module an extrapolated value of said position expected at said second time based on both a first value of said position and a first vector of said velocity at said first time; and (C) adjusting an interval in said rate module between said second time and a third time in response to a difference between said extrapolated value and a second value of said position at said second time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device comprising:
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a position module configured to measure both a position of said device and a velocity of said device at each of a first time and a second time in response to a plurality of navigation signals; and a rate module configured to (i) calculate an extrapolated value of said position expected at said second time based on both a first value of said position and a first vector of said velocity at said first time and (ii) adjust an interval between said second time and a third time in response to a difference between said extrapolated value and a second value of said position at said second time. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A device comprising:
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means for measuring both a position of said device and a velocity of said device at each of a first time and a second time in response to a plurality of navigation signals; and means for (i) calculating an extrapolated value of said position expected at said second time based on both a first value of said position and a first vector of said velocity at said first time and (ii) adjusting an interval between said second time and a third time in response to a difference between said extrapolated value and a measured value of said position at said second time.
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Specification