An Echo Suppression Delay Estimator for Angle-of-Arrival Ultrasonic Indoor Localization

Gabbrielli, Andrea; Xiong, Wenxin; Schott, Dominik Jan; Fischer, Georg; Wendeberg, Johannes; Höflinger, Fabian; Reindl, Leonhard M.; Schindelhauer, Christian; Rupitsch, Stefan J.

doi:10.1109/tim.2021.3083558

Cited by 24 publications

(5 citation statements)

References 31 publications

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“…Supposing that A x and A y are used to denote the orientation matrices in the x-direction and y-direction, respectively. The following formula can be obtained [20]:…”

Section: Aoa Algorithmmentioning

confidence: 99%

An Indoor Positioning System of Bluetooth AoA Using Two-Point Position-Based Uniform Linear Array

Shu¹,

Wang²

2023

Preprint

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“…Supposing that A x and A y are used to denote the orientation matrices in the x-direction and y-direction, respectively. The following formula can be obtained [20]:…”

Section: Aoa Algorithmmentioning

confidence: 99%

An Indoor Positioning System of Bluetooth AoA Using Two-Point Position-Based Uniform Linear Array

Shu¹,

Wang²

2023

Preprint

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“…Figure 6 pitch-angle α Figure 7 flip-angle β The position of the camera in the (OXYZ) spatial coordinate system obtained by combining the three rotation angles according to formula (3,4,5,12,13) is:…”

Section: Principle Of Positioning Algorithmmentioning

confidence: 99%

“…As indoor spaces become larger and larger, indoor navigation technology is gaining more and more attention, and the current indoor positioning technologies include: WIFI positioning [1] , Bluetooth positioning [2] , ultrasonic Positioning [3] and so on, even these positioning methods can meet the positioning needs, but the cost is high , the equipment is more complex and based on wireless signal transmission information which occupy the wireless channel resources. With the maturity of LED lighting technology [4] , the development of visible light communication technology is also gradually applied in the field of indoor positioning.…”

Section: Introductionmentioning

confidence: 99%

Research on indoor real-time positioning technology of LED visible light communication based on arbitrary three-axis rotation angle

Liu

Wang

et al. 2023

J. Phys.: Conf. Ser.

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LED visible light communication indoor positioning system based on three-axis rotation angle of cell phone, including modulated signal LED downlight, rotation vector sensor and camera of smartphone, target tracking module and developed positioning method. The main processes are: the three-axis rotation angle of cell phone obtained from the rotation vector sensor, the position information of LED downlight image in pixel coordinate system obtained from the camera, the LED downlight position information obtained by decoding method, bring the above information into the positioning system. Meanwhile, the target tracking module based on Continuously Adaptive Mean-shift (CAMSHIFT) algorithm can effectively enhance the system operation speed and improve the real-time performance, and the three-axis rotation angle can effectively adapt to the cell phone pose transformation. This positioning system performs well in terms of positioning accuracy and real-time performance.

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“…In order to further verify the applicability of the proposed ranging method, the three cases of the experiment are carried out. The ranging result will be compared with the traditional method, which only uses maximum cross-correlation (named as Peak) [ 41 , 48 , 55 , 56 , 57 ], two-stage search [ 40 ] (only use two-stage search) and env-two-stage proposed. The two smartphones are Huawei Mate40 Pro and Huawei P20Pro.…”

Section: Experiments and Simulationmentioning

confidence: 99%

Smartphone-Based Social Distance Detection Technology with Near-Ultrasonic Signal

Jia

Shu

Wang

et al. 2022

Sensors

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With the emergence of COVID-19, social distancing detection is a crucial technique for epidemic prevention and control. However, the current mainstream detection technology cannot obtain accurate social distance in real-time. To address this problem, this paper presents a first study on smartphone-based social distance detection technology based on near-ultrasonic signals. Firstly, according to auditory characteristics of the human ear and smartphone frequency response characteristics, a group of 18 kHz–23 kHz inaudible Chirp signals accompanied with single frequency signals are designed to complete ranging and ID identification in a short time. Secondly, an improved mutual ranging algorithm is proposed by combining the cubic spline interpolation and a two-stage search to obtain robust mutual ranging performance against multipath and NLoS affect. Thirdly, a hybrid channel access protocol is proposed consisting of Chirp BOK, FDMA, and CSMA/CA to increase the number of concurrencies and reduce the probability of collision. The results show that in our ranging algorithm, 95% of the mutual ranging error within 5 m is less than 10 cm and gets the best performance compared to the other traditional methods in both LoS and NLoS. The protocol can efficiently utilize the limited near-ultrasonic channel resources and achieve a high refresh rate ranging under the premise of reducing the collision probability. Our study can realize high-precision, high-refresh-rate social distance detection on smartphones and has significant application value during an epidemic.

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An Echo Suppression Delay Estimator for Angle-of-Arrival Ultrasonic Indoor Localization

Cited by 24 publications

References 31 publications

An Indoor Positioning System of Bluetooth AoA Using Two-Point Position-Based Uniform Linear Array

An Indoor Positioning System of Bluetooth AoA Using Two-Point Position-Based Uniform Linear Array

Research on indoor real-time positioning technology of LED visible light communication based on arbitrary three-axis rotation angle

Smartphone-Based Social Distance Detection Technology with Near-Ultrasonic Signal

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