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    VELOCITY ESTIMATION
    1.
    发明申请
    VELOCITY ESTIMATION 审中-公开

    公开(公告)号：US20180231577A1

    公开(公告)日：2018-08-16

    申请号：US15751839

    申请日：2015-08-10

    申请人： NIRA DYNAMICS AB

    发明人： Rickard KARLSSON ,  Fredrik GUSTAFSSON

    IPC分类号： G01P3/54

    CPC分类号： G01P3/54 ,  G01P3/48 ,  G01P3/50

    摘要： The present disclosure relates to the estimation of a velocity of a first object using accelerometer signals, indicating an acceleration of the first object and/or a second object coupled to a first object. To this end, a characteristic frequency in the accelerometer signal spectrum may be determined, preferably by applying a parametric model or by performing a spectrum analysis, and used as a basis to estimate the velocity of the first object based on the determined characteristic frequency. The characteristic frequency may be determined by identifying the frequency having the maximum spectral amplitude or by identifying the fundamental frequency or a particular harmonic in the spectrum.

    SHIP SPEED METER AND SHIP SPEED MEASUREMENT METHOD
    10.
    发明申请
    SHIP SPEED METER AND SHIP SPEED MEASUREMENT METHOD 审中-公开
    船舶速度计和船舶速度测量方法

    公开(公告)号：US20150025834A1

    公开(公告)日：2015-01-22

    申请号：US14378897

    申请日：2013-02-04

    申请人： Nippon Yusen Kabushiki Kaisha

    发明人： Hideyuki Ando ,  Masatoshi Hori ,  Ryo Kakuta

    IPC分类号： G01S15/88 ,  G01P3/02 ,  G01P3/50 ,  G01P3/26

    CPC分类号： G01S15/88 ,  B63B49/00 ,  B63J2099/008 ,  G01P3/02 ,  G01P3/26 ,  G01P3/50 ,  G01P5/241 ,  G01S15/60

    摘要： A ship's speed meter for measuring a speed relative to the water of a ship 10, the ship's speed meter including a wave transmitter 1 for emitting a sound wave toward a sea bottom 20, a wave receiver 2 for detecting a plurality of reflected waves, which are reflected waves of the sound wave having been emitted from the wave transmitter 1, reflected by a plurality of reflecting objects 30 positioned at different water depths, and an arithmetic processing unit 4 for calculating a ship's speed relative to the water of the ship 10 based on a frequency difference of the sound wave and the reflected wave. The arithmetic processing unit 4 obtains a change rate of a current velocity in a water depth direction by obtaining current velocities at a plurality of different water depths based on a frequency difference between the sound wave and the plurality of reflected waves, and calculates a current velocity at a water depth at which the change rate is smaller than or equal to a threshold value as the ship's speed relative to the water of the ship 10.

    摘要翻译： 用于测量相对于水的水速的船舶速度计10，该船舶速度计包括用于向海底20发射声波的波发射器1，用于检测多个反射波的波形接收器2， 是从波发射器1发射的声波的反射波，由位于不同水深的多个反射体30反射的运算处理单元4，用于计算相对于船10的水的船的速度 在声波和反射波的频率差上。 算术处理单元4基于声波和多个反射波之间的频率差，通过获得多个不同水深的当前速度来获得水深方向上的当前速度的变化率，并且计算当前速度 在变化率小于或等于阈值的水深处，作为船舶相对于船舶10的水的速度。