Method and system for enhancing accuracy in ultrasonic alignment
First Claim
1. A method for short range alignment using ultrasonic sensing, comprising:
- shaping an ultrasonic pulse signal on a first device to produce a pulse shaped signal and transmitting the pulse shaped signal from the first device to a second device;
receiving the pulse shaped signal and determining an arrival time of the pulse shaped signal received at the second device;
identifying a relative phase of the pulse shaped signal with respect to a previously received pulse shaped signal at the second device;
identifying a pointing location of a tip of the first device with respect to the second device from the arrival time of the received pulse shaped signal and the relative phase;
saving most recent pulse shaped signals to a history;
selectively discarding pulse shaped signals less recently saved in the history based on a similarity measure between pulse shaped signals in the history for further resolving the pointing location;
determining positional information of the pointing location of the first device at three or more points in three-dimensional space; and
reporting the positional information and an alignment of the three or more points,wherein the shaping uses a combination of amplitude modulation, frequency modulation, and phase modulation.
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Abstract
A method for short range alignment using ultrasonic sensing is provided. The method includes shaping an ultrasonic pulse on a first device to produce a pulse shaped signal and transmitting the pulse shaped signal from the first device to a second device, receiving the pulse shaped signal and determining an arrival time of the pulse shaped, identifying a relative phase of the pulse shaped signal with respect to a previously received pulse shaped signal, identifying a pointing location of the first device from the arrival time and the relative phase, determining positional information of the pointing location of the first device, and reporting an alignment of three or more points in three-dimensional space. Other embodiments are disclosed.
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Citations
13 Claims
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1. A method for short range alignment using ultrasonic sensing, comprising:
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shaping an ultrasonic pulse signal on a first device to produce a pulse shaped signal and transmitting the pulse shaped signal from the first device to a second device; receiving the pulse shaped signal and determining an arrival time of the pulse shaped signal received at the second device; identifying a relative phase of the pulse shaped signal with respect to a previously received pulse shaped signal at the second device; identifying a pointing location of a tip of the first device with respect to the second device from the arrival time of the received pulse shaped signal and the relative phase; saving most recent pulse shaped signals to a history; selectively discarding pulse shaped signals less recently saved in the history based on a similarity measure between pulse shaped signals in the history for further resolving the pointing location; determining positional information of the pointing location of the first device at three or more points in three-dimensional space; and reporting the positional information and an alignment of the three or more points, wherein the shaping uses a combination of amplitude modulation, frequency modulation, and phase modulation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for short range alignment using ultrasonic sensing, the method steps comprising:
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shaping three ultrasonic pulse signals on a first device to generate three pulse shaped signals and transmitting the three pulse shaped signals by way of three transmitters on the first device to a second device; receiving the three pulse shaped signals at each of three microphones on the second device and determining three arrival times for the three pulse shaped signals received at the three microphones; identifying three relative phases of the three pulse shaped signals with respect to previously received pulse shaped signals at the three corresponding microphones on the second device; identifying a pointing location of a tip of the first device with respect to a coordinate system of the second device from the three arrival times of the received pulse shaped signals and the three relative phases of the received pulse shaped signals; determining alignment of three or more registered pointing locations of the first device at three or more three-dimensional locations and at separate times by repeated operation of the method steps above; and reporting an alignment of the three or more pointing locations, wherein at least one portion of each pulse shaped signal is at least one among a frequency modulated region, constant frequency region, phase modulated region, and a chirp region. - View Dependent Claims (10, 11, 12, 13)
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Specification