Tunable filter device for spatial positioning systems
First Claim
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1. A device for a spatial positioning system comprising:
- a detector adapted to detect a measurement signal;
a signal processing unit communicably coupled to said detector, said signal processing unit adapted to analyze said measurement signal and determine at least one filter parameter value therefrom, wherein said signal processing unit compares a first filter output of a first filter to a second filter output of a second filter where said first and second filters have at least one different filter characteristic to discriminate device movement from noise detected by said detector and said signal processing unit further comprising a programmable measurement filter adapted to receive and filter said measurement signal based upon said at least one filter parameter value determined by said signal processing unit; and
an output device coupled to said signal processing unit.
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Abstract
A device for spatial positioning systems includes a programmable measurement filter that is dynamically tuned by the device signal processing unit. The signal processing unit analyzes available data including the measurement signal to determine the likelihood that a detected measurement comprises true device movement and adjusts the measurement filter bandwidth accordingly.
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Citations
29 Claims
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1. A device for a spatial positioning system comprising:
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a detector adapted to detect a measurement signal; a signal processing unit communicably coupled to said detector, said signal processing unit adapted to analyze said measurement signal and determine at least one filter parameter value therefrom, wherein said signal processing unit compares a first filter output of a first filter to a second filter output of a second filter where said first and second filters have at least one different filter characteristic to discriminate device movement from noise detected by said detector and said signal processing unit further comprising a programmable measurement filter adapted to receive and filter said measurement signal based upon said at least one filter parameter value determined by said signal processing unit; and an output device coupled to said signal processing unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A device for a spatial positioning system comprising:
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a detector adapted to detect a measurement signal; a first filter communicably coupled to said detector and arranged to filter said measurement signal, said first filter having a first filter output; a second filter communicably coupled to said detector and arranged to filter said measurement signal, said second filter having a second filter output; a signal processing unit communicably coupled to said detector, said signal processing unit adapted to analyze said measurement signal and determine at least one filter parameter value based at least partially from an analysis of said first and second filter outputs; a storage device located within said signal processing unit for storing said at least one filter parameter value; a programmable measurement filter adapted to receive and filter said measurement signal based upon said at least one filter parameter value retrieved from said storage device of said signal processing unit; and an output device coupled to said signal processing unit.
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23. A method of filtering a measurement signal in a device for a spatial positioning system comprising:
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analyzing a measurement signal from a detector of said device; filtering said measurement signal by a first filter to produce a first filter output and by a second filter to produce a second filter output; discriminating whether said measurement signal comprises movement of said device or comprises noise based at least partially on said first and second filter outputs; determining at least one filter characteristic based upon whether said measurement signal is determined to be noise or device movement; automatically tuning a programmable measurement filter based upon said at least one filter characteristic; and filtering said measurement signal using said programmable measurement filter.
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24. A method of filtering a measurement signal in a device for a spatial positioning system comprising:
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providing a detector adapted to detect a measurement signal; communicably coupling a first filter to said detector and arranged to filter said measurement signal, said first filter having a first filter output; communicably coupling a second filter to said detector and arranged to filter said measurement signal, said second filter having a second filter output; communicably coupling a signal processing unit to said detector, wherein said signal processing unit compares said first filter output to said second filter output where said first and second filters have at least one different filter characteristic to discriminate device movement from noise detected by said detector; analyzing said first and second filter outputs to derive at least one filter parameter value; and tuning a programmable measurement filter based upon said at least one filter parameter value determined by said signal processing unit. - View Dependent Claims (25, 26, 27, 28, 29)
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Specification