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    • 6. 发明申请
    • POSITION DETECTION APPARATUS, POSITION DETECTION METHOD, MOBILE, AND RECEIVER
    • 位置检测装置,位置检测方法,移动和接收器
    • US20120188847A1
    • 2012-07-26
    • US13387958
    • 2010-04-21
    • Junichi MiyamotoHiroshi Kajitani
    • Junichi MiyamotoHiroshi Kajitani
    • G01S15/06
    • G06F3/0433G01S11/16
    • To detect the positions of the respective mobiles correctly without being affected by the ultrasonic waves from other mobile(s) in a case where plural mobiles are used simultaneously.The mobile comprises a unit that transmits a trigger signal of requesting transmitting ultrasonic wave that is capable of identifying the mobile, a unit that receives a trigger signal of allowing transmitting ultrasonic wave from the receiver, and a unit that transmits an ultrasonic wave immediately upon receipt of the trigger signal of allowing transmitting ultrasonic wave. The receiver comprises a unit that receives a trigger signal of requesting transmitting ultrasonic wave from the mobile, a unit that transmits a trigger signal of allowing transmitting ultrasonic wave that can be identified at the mobile side, a control unit that controls a transmitting timing of the trigger signal of allowing transmitting ultrasonic wave, at least two ultrasonic wave receiving units provided at predetermined gaps, a unit that calculates an ultrasonic wave propagation time from the mobile based on a time of transmitting the trigger signal of allowing transmitting ultrasonic wave and an ultrasonic wave arrival time, and a position calculation unit that calculates a position of the mobile based on the ultrasonic wave propagation time calculated.
    • 在同时使用多个移动台的情况下,可以正确地检测各个移动台的位置,而不受来自其他移动台的超声波的影响。 移动台包括发送能够识别移动台的请求发送超声波的触发信号的单元,接收允许从接收器发送超声波的触发信号的单元,以及接收时立即发送超声波的单元 允许发送超声波的触发信号。 接收机包括接收从移动台请求发送超声波的触发信号的单元,发送允许发送可在移动侧识别的超声波的触发信号的单元,控制单元,其控制移动台的发送定时 允许发送超声波的触发信号,至少两个设置在预定间隙处的超声波接收单元,基于发送允许发送超声波的触发信号和超声波计算来自移动台的超声波传播时间的单元 到达时间,以及基于所计算的超声波传播时间来计算移动体的位置的位置计算单元。
    • 7. 发明申请
    • ULTRASONIC WAVE PROPAGATION TIME MEASURING SYSTEM
    • 超声波传播时间测量系统
    • US20100228523A1
    • 2010-09-09
    • US12675683
    • 2008-08-28
    • Hiroshi KajitaniJunichi Miyamoto
    • Hiroshi KajitaniJunichi Miyamoto
    • G04F10/00G01S1/24G01S1/74
    • G01S11/16G06F3/0433
    • A position detection method and system that eliminate an effect of residual vibration of a piezoelectric or magnetostrictive element, increase correlativity between a received ultrasonic waveform and a model waveform, and are not affected by a reflected wave of an ultrasonic wave signal. A transmission unit of an ultrasonic wave propagation time measuring system of the present invention generates an electromagnetic wave signal including a trigger signal that indicates transmission timing and an ultrasonic wave drive signal by modulating an ultrasonic wave on the basis of a pseudo-random signal with high autocorrelativity at the same time as transmission of the electromagnetic wave signal, and transmits an ultrasonic wave signal of a frequency higher than a frequency of the ultrasonic wave drive signal by an ultrasonic wave transmitter. A reception unit detects the electromagnetic wave signal and the ultrasonic wave signal, and is provided with a data processing circuit for computing, with the ultrasonic wave drive signal as a model waveform, correlation values between the detected ultrasonic wave signal and the model waveform, detecting a main peak value of the computed correlation values, and computing an ultrasonic wave propagation time from a point in time of detection of the electromagnetic wave signal and a point in time of detection of the main peak value.
    • 消除压电或磁致伸缩元件的残余振动的影响的位置检测方法和系统增加了接收的超声波波形和模型波形之间的相关性,并且不受超声波信号的反射波的影响。 本发明的超声波传播时间测量系统的发送单元通过基于具有高的伪随机信号调制超声波来生成包括指示发送定时的触发信号的电磁波信号和超声波驱动信号 与电磁波信号的发送同时进行自相关,并通过超声波发送器发送高于超声波驱动信号的频率的超声波信号。 接收单元检测电磁波信号和超声波信号,并且设置有数据处理电路,用超声波驱动信号作为模型波形,计算检测到的超声波信号与模型波形之间的相关值,检测 计算的相关值的主峰值,以及从检测到电磁波信号的时间点和主峰值的检测时刻计算超声波传播时间。