Ultra-tightly coupled global navigation satellite system space borne receiver system
First Claim
1. A global navigation satellite system (GNSS) ultra-tight-coupling (UTC) receiver system for use on a space-borne platform, comprising:
- means for predicting a translational motion of the platform;
means for sensing a rotational motion of the platform;
means for determining a nominal trajectory of the platform based on the translational and rotational motions of the platform; and
a Kalman error state filter means for estimating an error in the nominal trajectory of the platform relative to an actual trajectory of the platform.
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Abstract
A GNSS ultra-tight coupling (UTC) receiver architecture applicable to space borne orbit platforms is described. A receiver in accordance with this architecture retains the rotational motion sensors typically found in an inertial measurement unit (IMU) of a conventional UTC receiver, but replaces the IMU accelerometer sensors with precise orbital dynamics models to predict the translational motion of the platform center of gravity (CG). Drag and radiation pressure may be modeled as well. The various models can be implemented in software. The IMU rotational sensors are retained for compensation of the GNSS antenna lever arm effect due to platform rotation.
15 Citations
23 Claims
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1. A global navigation satellite system (GNSS) ultra-tight-coupling (UTC) receiver system for use on a space-borne platform, comprising:
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means for predicting a translational motion of the platform; means for sensing a rotational motion of the platform; means for determining a nominal trajectory of the platform based on the translational and rotational motions of the platform; and a Kalman error state filter means for estimating an error in the nominal trajectory of the platform relative to an actual trajectory of the platform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of determining a trajectory of a space-borne platform comprising:
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predicting a translational motion of the platform; sensing a rotational motion of the platform; determining a nominal trajectory of the platform based on the translational and rotational motions of the platform; and estimating an error in the nominal trajectory of the platform relative to an actual trajectory of the platform. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification