System and method for estimating heading misalignment
First Claim
1. A portable device, the device being within a platform, the device comprising a sensor assembly integrated with the portable device that outputs inertial sensor data and a heading misalignment estimator configured to:
- determine an effective frequency characteristic of the inertial sensor data, wherein the effective frequency characteristic of the inertial sensor data represents periodic characteristics of motion of the platform;
process the inertial sensor data based at least in part on the determined frequency characteristic, wherein processing the inertial sensor data comprises reducing signal artifacts; and
estimate a heading misalignment between a heading of the portable device and the platform using the processed inertial sensor data, wherein estimating the heading misalignment is based at least in part on a maximum variance of the processed inertial sensor data.
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Abstract
This disclosure relates to heading misalignment estimation with a portable device and more specifically to estimating misalignment between a portable device having a sensor assembly and a platform transporting the portable device when the platform is undergoing motion having periodic characteristics. In one aspect, a suitable method includes obtaining inertial sensor data for the portable device and determining an effective frequency characteristic of the inertial sensor data representing the motion having periodic characteristics. The inertial sensor data may be processed using the determined frequency characteristic so that a heading misalignment may be estimated between the heading of the portable device and the platform.
28 Citations
37 Claims
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1. A portable device, the device being within a platform, the device comprising a sensor assembly integrated with the portable device that outputs inertial sensor data and a heading misalignment estimator configured to:
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determine an effective frequency characteristic of the inertial sensor data, wherein the effective frequency characteristic of the inertial sensor data represents periodic characteristics of motion of the platform; process the inertial sensor data based at least in part on the determined frequency characteristic, wherein processing the inertial sensor data comprises reducing signal artifacts; and estimate a heading misalignment between a heading of the portable device and the platform using the processed inertial sensor data, wherein estimating the heading misalignment is based at least in part on a maximum variance of the processed inertial sensor data. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for navigation with a portable device associated with a platform undergoing motion having periodic characteristics, the method comprising:
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obtaining inertial sensor data for the portable device; determining an effective frequency characteristic of the inertial sensor data; processing the inertial sensor data based at least in part on the determined frequency characteristic, wherein processing the inertial sensor data comprises reducing signal artifacts; and estimating a heading misalignment between a heading of the portable device and the platform using the processed inertial sensor data, wherein estimating the heading misalignment is based at least in part on a maximum variance of the processed inertial sensor data. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification