Calibration of an internal sensor system
First Claim
1. An inertial sensor system calibration apparatus for an inertial sensor system mounted within an enclosure, the enclosure having first and second planar reference surfaces, said calibration apparatus comprising:
- a rate table; and
a calibration device comprising;
a primary mounting member with a primary mounting surface that is substantially planar;
a secondary mounting member positioned proximate to said primary mounting member, said secondary mounting member has a secondary mounting surface which is substantially planar and substantially perpendicular to the primary mounting surface;
mounting means which fixes the enclosure on said primary and secondary mounting members so that the enclosure reference surface is flush against the primary mounting surface and a reference edge substantially parallel to the secondary mounting surface is established along the second reference surface; and
means to position said primary and secondary mounting members on the rate table so that said first and second mounting members rotate about axes normal to the primary mounting surface and said secondary mounting surface.
1 Assignment
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Accused Products
Abstract
A calibration device for establishing a 3-D reference frame for an inertial sensor system. A secondary mounting surface on the calibration device is used to provide a measurement of the reference line required for inertial system installation alignment. This device provides a means for establishing a highly accurate alignment of inertial system sensors relative to the output coordinates, called the "mounting frame", without a requirement for optics or a manual transfer of data. By rotating the inertial sensor system through use of a rate table into planes which are substantially perpendicular to each other, the mounting frame for the sensor system can be established.
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Citations
10 Claims
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1. An inertial sensor system calibration apparatus for an inertial sensor system mounted within an enclosure, the enclosure having first and second planar reference surfaces, said calibration apparatus comprising:
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a rate table; and a calibration device comprising; a primary mounting member with a primary mounting surface that is substantially planar; a secondary mounting member positioned proximate to said primary mounting member, said secondary mounting member has a secondary mounting surface which is substantially planar and substantially perpendicular to the primary mounting surface; mounting means which fixes the enclosure on said primary and secondary mounting members so that the enclosure reference surface is flush against the primary mounting surface and a reference edge substantially parallel to the secondary mounting surface is established along the second reference surface; and means to position said primary and secondary mounting members on the rate table so that said first and second mounting members rotate about axes normal to the primary mounting surface and said secondary mounting surface. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of calibrating an inertial sensor system comprising the steps of:
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mounting an inertial sensor system within an enclosure which has an exterior reference surface and a reference edge; providing primary and secondary planar mounting surfaces which are substantially perpendicular to each other; mounting the enclosure on the primary mounting surface with the reference surface flush against the primary mounting surface and the reference edge parallel to the intersection of the primary and secondary planar mounting surfaces; rotating said enclosure about an axis normal to said primary mounting surface to establish an X-axis for the inertial sensor system; rotating said enclosure about an axis normal to said secondary mounting surface to establish a directional vector; calculating the cross product of the directional vector and the X-axis to establish a Y-axis for the inertial sensor system; and calculating the cross product of the X-axis and the Y-axis to establish a Z-axis for the inertial sensor system. - View Dependent Claims (9, 10)
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Specification