Real-time dynamic tracking of bias
First Claim
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1. A device comprising:
- at least one sensor configured to generate at least one output;
a processor configured to estimate bias associated with said at least one sensor using at least a first bias estimating technique to generate a first bias estimate and a second bias estimating technique to generate a second bias estimate; and
said processor configured to generate an estimated state for use in bias estimation when said at least one output is not available during a desired time interval.
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Abstract
A bias value associated with a sensor, e.g., a time-varying, non-zero value which is output from a sensor when it is motionless, is estimated using at least two, different bias estimating techniques. A resultant combined or selected bias estimate may then be used to compensate the biased output of the sensor in, e.g., a 3D pointing device.
98 Citations
22 Claims
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1. A device comprising:
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at least one sensor configured to generate at least one output; a processor configured to estimate bias associated with said at least one sensor using at least a first bias estimating technique to generate a first bias estimate and a second bias estimating technique to generate a second bias estimate; and said processor configured to generate an estimated state for use in bias estimation when said at least one output is not available during a desired time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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10. The device of claim, wherein said first bias estimating technique determines that said device is stationary when peak-to-peak values received from said sensor are less than a predetermined threshold.
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21. A device comprising:
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at least one sensor for detecting rotation of said device about at least one axis and generating a first output associated therewith; an accelerometer for detecting acceleration of said device and generating a second output associated therewith; and a processor for receiving said first and second outputs, determining a bias value associated with said first output using at least one of a first bias estimation technique a second bias estimation technique, a third bias estimation technique and a fourth bias estimation technique, wherein said first bias estimation technique is based upon determining whether said device is stationary, said second bias estimation technique is based upon detection of a pitch of said device, said third bias estimation technique is based upon slew-rate and said fourth bias estimation is based upon a temperature output. - View Dependent Claims (22)
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Specification