Inertial system having correction means for effects of gravitational anomalies
First Claim
1. An inertial navigation system for correcting the effects of gravitational anomalies comprising:
- a first inertial navigation sensor,a second inertial navigation sensor displaced from said first sensor by a predetermined distance,means for providing correction signals to the output signals of said first and second inertial navigation sensors by processing the output signals of said first and second inertial sensors whereby said navigation system is corrected for the effects of gravitational errors.
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Accused Products
Abstract
Conventional first and second Schuler tuned inertial platforms, that are physically displaced from each other by a predetermined distance, are employed in an inertial system to reduce navigation errors caused by the uncertainty in the earth'"'"'s gravitational field. In addition to the two Schuler tuned platforms, a conventional velocity measuring instrument is employed to provide damping to the inertial system. The invention takes advantage of the fact that for a pair of ideal platforms if the relative velocity between them as displaced sensors can be measured with moderate accuracy then performance rivaling that obtainable with a gradiometer aided inertial platform can be achieved.
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Citations
8 Claims
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1. An inertial navigation system for correcting the effects of gravitational anomalies comprising:
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a first inertial navigation sensor, a second inertial navigation sensor displaced from said first sensor by a predetermined distance, means for providing correction signals to the output signals of said first and second inertial navigation sensors by processing the output signals of said first and second inertial sensors whereby said navigation system is corrected for the effects of gravitational errors. - View Dependent Claims (2)
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3. An inertial system for correcting the effects of gravitational anomalies comprising:
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a first Schuler tuned inertial platform, a second Schuler tuned inertial platform displaced a predetermined distance from said first inertial platform, means for providing an independent measurement of velocity, means responsive to said independent velocity measurement for providing damping correction signals to the output of said first and second inertial platforms, and means for providing delta correction signals to the output of said first and second inertial platforms. - View Dependent Claims (4, 5, 6)
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7. In an inertial navigation system having a first Schuler tuned platform and a second Schuler tuned platform displaced a predetermined distance apart, a plurality of summing, differencing and gain circuits interconnecting the output signals of each Schuler tuned platform, a plurality of identical transfer function circuits comprising summing, differencing and gain circuit and a velocity measuring circuit, the method of correcting for the effects of gravitational anomaly errors comprising:
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separating the first and second Schuler tuned platforms a predetermined distance apart, using the summing, differencing and gain circuits to combine the position and velocity output signals of said first Schuler tuned platform with the position and velocity output signals of said second Schuler tuned platform to obtain signals representative of average inertial platform velocity, average inertial platform position and inertial platform residual velocity, using summing and differencing circuits of the transfer circuits to combine said average inertial platform position signal with a first and second position correcting signal, and using said summing and differencing circuits of said transfer function circuit to combine said average inertial platform velocity signal with a first and second velocity correcting signal to obtain estimated system position and velocity signals corrected for gravitational anomalies. - View Dependent Claims (8)
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Specification