Gravity aided inertial navigation system
First Claim
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1. A navigation system, comprising:
- a gravity gradiometer means;
a three axis inertial position determining means including a vertical accelerometer means;
a vertical displacement sensor; and
an optimal filter means for integrating electronic outputs from said gravity gradiometer means, said three axis inertial position determining means and said vertical displacement sensor.
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Abstract
An autonomous covert Inertial Navigation System uniquely suited for underwater applications wherein Schuler and siderial errors are bounded without external navigation aids or active instrumentation of ground speed is achieved by integrating a conventional Inertial Navigation System with a gravity gradiometer capable of measuring gravity field components independently of platform accelerations.
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Citations
10 Claims
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1. A navigation system, comprising:
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a gravity gradiometer means; a three axis inertial position determining means including a vertical accelerometer means; a vertical displacement sensor; and an optimal filter means for integrating electronic outputs from said gravity gradiometer means, said three axis inertial position determining means and said vertical displacement sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A navigation system, comprising:
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a gradiometer means comprising from one to three gradiometers each comprising four rotating accelerometers mounted tangentially at cardinal points on a rotating means; a three axis inertial position determining means including a gravimeter grade vertical accelerometer; a depth sensor; and an optimal filter means for integrating outputs from said gradiometer means;
said three axis inertial position determining means and said depth sensor.
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Specification