High-Accuracy Reference-Free Ultrasonic Location Estimation

Saad, Mohamed; Bleakley, Chris J.; Ballal, Tarig; Dobson, Simon

doi:10.1109/tim.2011.2181911

Cited by 100 publications

(53 citation statements)

References 33 publications

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“…In [4], an ultrasonic beacon using FHSS modulation was used to estimate the position. However, it required the simultaneous use of multiple speakers for position estimation and a high frequency not supported by existing speakers, meaning that it cannot be directly applied to a real environment.…”

Section: Related Studiesmentioning

confidence: 99%

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Proposal of Ultrasonic Communication Method and Its Application to Position Estimation System

Tsugawa

Ogawa

2017

Journal of Signal Processing

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Recently, services using position information have been increasing. Radio waves and ultrasonic waves are used to acquire position information. Ultrasonic waves can be transmitted and received with existing speakers and popular smartphones. Therefore, there is no need for new devices for position estimation and their convenience is high. However, to the best of our knowledge, a modulation method and a symbol synchronization method for ultrasonic communication that are applicable to existing speakers and smartphones have not been proposed.In this paper, we propose an ultrasonic communication method applicable to existing speakers and smartphones. Moreover, we propose a method of acquiring position information from the signal level of ultrasonic waves at a receiver based on the proposed ultrasonic communication method. Through an experimental evaluation, we confirmed the effectiveness of communications and position estimation.

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Section: Related Studiesmentioning

confidence: 99%

“…The correct error code is the Hamming (7, 4) code. Error correction channels [1] - [3] are used for the error correction of data channels [1] - [4]. Similarly, error correction channels …”

Section: Frequency Bands and Channel Configurationsmentioning

confidence: 99%

Proposal of Ultrasonic Communication Method and Its Application to Position Estimation System

Tsugawa

Ogawa

2017

Journal of Signal Processing

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“…This computational cost is negligible in comparison to other DOA [17] or DTOA [22] systems, where minimization functions are used, allowing low-cost implementations.…”

Section: Computational Effortmentioning

confidence: 99%

ALO4: Angle Localization and Orientation System with Four Receivers

Elvira

Castro

Garrido

2014

International Journal of Advanced Robotic Systems

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This paper presents a 2D indoor localization and orientation system based on a TDOA (Time Difference of Arrival) technique. It uses an array of receivers (four lowcost ultrasonic resonant devices in a square distribution) to implement low-computational-effort DOA (Direction of Arrival) algorithms, based on assumed plane-wave reception. The system only demands two transmitters at well-known positions on the ceiling of the room for obtaining the node position and orientation when it is deployed on the floor of the room. This system has been tested using a Xilinx Spartan-3A FPGA that implements a 52 MHz MicroBlaze. The experimental results include a total of 1,440 points, obtaining a mean localization error of 5.17 cm and a mean orientation error of 3.34º. For this system, the localization and orientation processes are executed in less than 50 us.

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“…Advancements in location-based technology may reduce this burden in the future (e.g. Jung et al, 2012;Rahman et al, 2012;Saad et al, 2012). Probability sampling designs will produce maps with some sampling locations very near one another and can help constrain the variogram for small separation distances and may improve interpolation accuracy.…”

Section: Sampling Designmentioning

confidence: 99%

Influence of Analysis Methods on Interpretation of Hazard Maps

2012

The Annals of Occupational Hygiene

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exposure or hazard mapping is becoming increasingly popular among industrial hygienists. Direct-reading instruments used for hazard mapping of data collection are steadily increasing in reliability and portability while decreasing in cost. exposure measurements made with these instruments generally require no laboratory analysis although hazard mapping can be a time-consuming process. to inform decision making by industrial hygienists and management, it is crucial that the maps generated from mapping data are as accurate and representative as possible. Currently, it is unclear how many sampling locations are necessary to produce a representative hazard map. As such, researchers typically collect as many points as can be sampled in several hours and interpolation methods are used to produce higher resolution maps. We have reanalyzed hazard-mapping data sets from three industrial settings to determine which interpolation methods yield the most accurate results. the goal is to provide practicing industrial hygienists with some practical guidelines to generate accurate hazard maps with 'off-the-shelf' mapping software. Visually verifying the fit of the variogram model is crucial for accurate interpolation. exponential and spherical variogram models performed better than Gaussian models. It was also necessary to diverge from some of the default interpolation parameters such as the number of bins used for the experimental variogram and whether or not to allow for a nugget effect to achieve reasonable accuracy of the interpolation for some data sets.

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High-Accuracy Reference-Free Ultrasonic Location Estimation

Cited by 100 publications

References 33 publications

Proposal of Ultrasonic Communication Method and Its Application to Position Estimation System

Proposal of Ultrasonic Communication Method and Its Application to Position Estimation System

ALO4: Angle Localization and Orientation System with Four Receivers

Influence of Analysis Methods on Interpretation of Hazard Maps

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