Airborne ultrasound data communications: the core of an indoor positioning system

Holm, Sverre

doi:10.1109/ultsym.2005.1603217

Cited by 33 publications

(20 citation statements)

References 12 publications

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“…The system depends on synchronised beacons in order to estimate DTOA. In [23] Sverre Holm proposed utilizing an ultrasonic indoor data communications system to perform indoor positioning which can rely on ultrasound alone, as no radio, no infrared channel nor any tether is required. The system uses a transmitter tag and a receiver detector and the positioning method operates in a fashion similar to RFID while benefitting from the shielding provided by room walls to ultrasonic signals, the proposed system provides proximity sensing but does not provide the actual 3D position.…”

Section: Related Workmentioning

confidence: 99%

High-Accuracy Reference-Free Ultrasonic Location Estimation

Saad

Bleakley

Ballal

et al. 2012

IEEE Trans. Instrum. Meas.

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Section: Related Workmentioning

confidence: 99%

High-Accuracy Reference-Free Ultrasonic Location Estimation

Saad

Bleakley

Ballal

et al. 2012

IEEE Trans. Instrum. Meas.

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“…This can also be called positioning by confinement. Based on the analysis of [5], [6], it is shown here that this makes the system much more robust as time-delay estimation is no longer needed. Instead one needs to establish communications and transfer a short message with identity information.…”

Section: Introductionmentioning

confidence: 99%

Hybrid ultrasound-RFID indoor positioning: Combining the best of both worlds

Holm

2009

2009 IEEE International Conference on RFID

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Abstract-Existing hybrid ultrasound/RF positioning systems usually measure ultrasonic time-of-flight. This operation requires a wide bandwidth and this makes it rather noise sensitive, limiting the useful range. Therefore a new system is proposed where only the room-indicating capability of ultrasound is utilized and combined with RF. A portable tag obtains the room location by receiving a narrow bandwidth signal from a stationary ultrasound transmitter. The result is then relayed back over RF. This combines the high accuracy of ultrasound to pinpoint exactly the room location with the high communications capacity of RF that enables tracking of hundreds of simultaneously moving tags. Secondary parameters that may aid in refining the position such as ultrasound signal level and velocity may also be measured. In addition to the increased capacity, the use of portable receivers instead of transmitters, as in ultrasound-alone indoor positioning systems, also has the advantage of reduced user exposure to ultrasound due to the larger distance to the transmitters.

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“…Ultrasonic sensor systems in different system configurations have been used in [11] and [12] for indoor ranging and reference-free localization. In addition, ultrasonic sensors have been used for indoor communications [13]- [17]. A high rate ultrasonic communication system was designed to operate in frequencies in the order of hundreds of kHz [13], [14], while in [15] a bandwidth between 50-110 kHz was used for transmission.…”

mentioning

confidence: 99%

“…A high rate ultrasonic communication system was designed to operate in frequencies in the order of hundreds of kHz [13], [14], while in [15] a bandwidth between 50-110 kHz was used for transmission. In [16] and [17], the feasibility of ultrasonic communications at frequencies in the order of tens of kHz was investigated.…”

mentioning

confidence: 99%

Indoor Granular Presence Sensing and Control Messaging With an Ultrasonic Circular Array Sensor

et al. 2015

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Abstract-Providing automated granular control of lighting, along with user-driven control, results in an energy-efficient smart lighting system design while catering to personal occupant preferences. Two functional ingredients in such a system are: 1) sensing that provides granular information on occupant location and 2) a communication system to transmit control messages from a user. In this paper, we consider an ultrasonic circular array sensor that provides the dual functionality of granular occupant sensing and a communication receiver for user control transmissions. A ceiling-mounted sensor configuration with a colocated ultrasonic transmitter and array receiver is considered. To perform presence sensing, this transmitter sends periodic bursts of sinusoidal pulses that, upon reflection from the environment, are received at the array sensor. The echoes are processed to obtain estimates of range, azimuth, and elevation angles corresponding to possible occupant movements. A Kalman filter based on a near constant velocity model is used for target tracking. The resulting occupant location is used for energy-efficient lighting control. A user may in addition control lamps in its vicinity by sending messages at ultrasonic frequency, which are processed by the receiver array, and used to further adapt requested parameters of the lighting system. The proposed sensing and messaging solution is tested in an indoor office space with an eight-element receiver array sensor prototype.

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Airborne ultrasound data communications: the core of an indoor positioning system

Cited by 33 publications

References 12 publications

High-Accuracy Reference-Free Ultrasonic Location Estimation

High-Accuracy Reference-Free Ultrasonic Location Estimation

Hybrid ultrasound-RFID indoor positioning: Combining the best of both worlds

Indoor Granular Presence Sensing and Control Messaging With an Ultrasonic Circular Array Sensor

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