Detection of individual vehicles approaching for pedestrians using digital modulated warning sounds

Umezawa, Yusuke; Ebihara, Tadashi; Mizutani, Koichi; Wakatsuki, Naoto

doi:10.1109/gcce.2017.8229355

Cited by 1 publication

(2 citation statements)

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“…1). 8,9) For our purposes, speed is defined as the rate of change in distance with time; relative speed is defined as the speed at which the transmitter and the receiver approach. In an acoustic communication, the amount of information that can be transmitted per unit of time is smaller than radio communication.…”

Section: Introductionmentioning

confidence: 99%

“…27) Therefore, if it is possible to construct an acoustic vehicle-to-pedestrian communication system that can not only exchange information but also measure the relative speed between pedestrian and vehicle, it can improve traffic safety. Although the authors have previously shown that the approach of vehicles can be detected by experiments using real vehicles, 8,9) this paper explains the detailed mechanism of the proposed system and evaluates its validity through comparative experiments.…”

Section: Introductionmentioning

confidence: 99%

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Design and performance evaluation of acoustic vehicle-to-pedestrian communication system

Umezawa¹,

Ebihara²,

Mizutani³

et al. 2019

Jpn. J. Appl. Phys.

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There is a greater risk of vehicle-pedestrian accidents when vehicles are traveling at low speeds. To cope with this problem, acoustic vehicle-topedestrian communication that can measure relative speed between vehicle and pedestrian is proposed. The proposed system is easy to implement on both the vehicle and pedestrian side, and will promote improved traffic safety. The proposed system is affected by noise, Doppler shift, fading, delay spread, and Doppler spread, and uses an orthogonal frequency division multiplexing signal, error correcting code, frequency diversity, and null subcarrier to counteract these effects. The performance of the proposed system was evaluated in outdoor experiments using real vehicles. In a line-of-sight environment, the proposed system measured relative speed and communicated without bit error at a distance of 40 m with a transmitter moving at about 2.78 m s −1 and a stationary receiver. In a non-line-of-sight environment, the proposed system measured relative speed and communicated without bit error at a 9 m distance between transmitter and receiver, which is a sufficient distance to prevent vehiclepedestrian accidents.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%