Side-looking fish finder
    2.
    发明授权
    Side-looking fish finder 失效
    侧面寻找鱼

    公开(公告)号:US5260912A

    公开(公告)日:1993-11-09

    申请号:US7356

    申请日:1993-01-21

    申请人: Mark W. Latham

    发明人: Mark W. Latham

    IPC分类号: G01S7/527 G01S15/96

    摘要: A side-looking fish finding apparatus transmits a sonar pulse approximately horizontally into a body of water, and then monitors echoes from the pulse. The time interval between successive sonar pulses is varied in a random manner in order to permit two or more similar units to be used in close proximity to each other without significantly interfering with each other. An individual echo is treated as the detection of a fish if it has a magnitude above a predetermined threshold, if it has a length within a predetermined range bounded by upper and lower limits, if it is preceded by a leading space interval free of other echoes and having a predetermined duration, if it is followed by a trailing space interval free of other echoes and having a predetermined duration, the duration of the trailing space interval being less than the duration of the leading space interval, and if an equivalent echo is received in response to each of the next four successive sonar pulses.

    摘要翻译: 侧面寻找装置将声纳脉冲大致水平地传送到水体中,然后监测来自脉冲的回波。 以随机方式改变连续的声纳脉冲之间的时间间隔,以允许两个或多个相似的单元彼此靠近地使用,而不会彼此明显地相互干扰。 如果单个回波具有高于预定阈值的幅度,则其被视为鱼的检测,如果其长度在由上限和下限限定的预定范围内,则如果前面是没有其他回波的前导空格间隔 并且具有预定的持续时间,如果后面是没有其他回声并且具有预定持续时间的尾随空格间隔,则所述尾部空格间隔的持续时间小于前导空格间隔的持续时间,并且如果接收到等效回波 响应于接下来的四个连续声纳脉冲中的每一个。