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    • 4. 发明申请
    • METHOD FOR ESTIMATING VELOCITIES AND/OR DISPLACEMENTS FROM ACCELEROMETER MEASUREMENT SAMPLES
    • 从加速度计测量样本估计速度和/或位移的方法
    • WO2011064705A1
    • 2011-06-03
    • PCT/IB2010/055319
    • 2010-11-22
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.BAGGEN, Constant, Paul, Marie, JozefCHEN, Ningjiang
    • BAGGEN, Constant, Paul, Marie, JozefCHEN, Ningjiang
    • G08B21/04A61B5/11G01C9/00
    • A61B5/1117A61B2562/0219G01P7/00G01P15/0891G01P15/18G08B21/043G08B21/0446
    • There is provided a fall detector for use in detecting falls by a user, the fall detector comprising an accelerometer for producing a time series of measurement samples representing the acceleration acting on the fall detector; a processor for estimating a vertical velocity and/or vertical displacement of the fall detector from the measurement samples and using the estimated vertical velocity and/or vertical displacement to determine whether the user has suffered a fall; wherein the processor is configured to estimate a vertical velocity and/or vertical displacement of the fall detector from the measurement samples by estimating a corresponding time series of unit vectors representing acceleration due to gravity in the reference frame of the accelerometer from the time series of measurement samples; projecting each measurement sample onto the corresponding unit vector and subtracting acceleration due to gravity to give a series of estimates for the vertical acceleration of the fall detector; and integrating the series of estimates for the vertical acceleration over a time period to give a time series of values for the vertical velocity and/or vertical displacement of the fall detector.
    • 提供了一种用于检测用户跌落的跌落检测器,该跌落检测器包括:加速度计,用于产生表示作用在跌落检测器上的加速度的测量样本的时间序列; 用于估计下降检测器与测量样本的垂直速度和/或垂直位移的处理器,并使用估计的垂直速度和/或垂直位移来确定用户是否遭受跌倒; 其中所述处理器被配置为通过从所述测量的时间序列估计所述加速度计的参考帧中的由于重力引起的加速度的相应时间序列来估计所述跌落检测器与所述测量样本的垂直速度和/或垂直位移 样本; 将每个测量样本投影到相应的单位向量上,并且减去由于重力引起的加速度,以给出对于下降检测器的垂直加速度的一系列估计; 并且对一段时间内的垂直加速度的一系列估计值进行积分,以给出坠落检测器的垂直速度和/或垂直位移的值的时间序列。