MOBILE DEVICE INDOOR NAVIGATION
First Claim
1. A method of determining position of a mobile device, the method comprising:
- from a signal received at the mobile device, detecting at least a first signal encoded in an audio signal from a first audio source;
using the first signal to identify a neighboring audio source;
reconstructing a second signal associated with the neighboring audio source;
using the reconstructed second signal to detect a second signal transmitted from the neighboring audio source; and
based on detecting of the first and second signals, determining position of the mobile device.
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Accused Products
Abstract
Mobile device positioning employs various forms of audio signal structures and detection methodologies. In one method, detection of an audio signal from a first source enables construction of a signal to facilitate detection of an audio signal from another source. Signals detected from these sources enable positioning of the mobile device receiving those signals. Another method forms audio signals transmitted from audio sources so that they have parts that add constructively and parts that differentiate the sources to enable positioning. Another audio signal based positioning method adaptively switches among positioning methods so that positioning remains operative as a mobile device moves toward and away from the sources. Another method tracks positioning history, evaluates it for errors and performs error mitigation to improve accuracy. Various other positioning technologies are detailed as well.
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Citations
25 Claims
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1. A method of determining position of a mobile device, the method comprising:
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from a signal received at the mobile device, detecting at least a first signal encoded in an audio signal from a first audio source; using the first signal to identify a neighboring audio source; reconstructing a second signal associated with the neighboring audio source; using the reconstructed second signal to detect a second signal transmitted from the neighboring audio source; and based on detecting of the first and second signals, determining position of the mobile device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of forming audio signals for determining device positioning, the method comprising:
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providing a first signal to be transmitted from a first audio source; providing a second signal to be transmitted form a second audio source; wherein the first and second signals are configured to have a common code signal part that adds constructively in a receiver, and a different code signal part that discriminates the first and second audio sources. - View Dependent Claims (14)
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15. A method of determining device positioning through audio signals, the method comprising:
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receiving an audio signal; analyzing the audio signal for code signal types, the code signal types corresponding to audio positioning methods, the methods including two or more of;
strength of signal, proximity, or time difference of arrival; andswitching between positioning methods based on a signal detection. - View Dependent Claims (16)
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17. A method of determining device positioning through audio signals, the method comprising:
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tracking history of device positioning relative to audio sources based on detection of signals from the audio sources; and computing a positioning estimate of the device relative to the audio sources; and comparing the positioning to the history to detect potential error in the positioning estimate. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A method for determining position of a mobile device, the method comprising:
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transmitting signals from sources, the signals forming an interference pattern in which symbols formed by the interference pattern at locations between the sources correspond to a position; and detecting a symbol from among the symbols from a signal formed from capturing a combination of the signals at the position corresponding the symbol. - View Dependent Claims (24, 25)
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Specification