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    BOREHOLE SURVEY SYSTEM UTILIZING STRAPDOWN INERTIAL NAVIGATION
    2.
    发明公开
    BOREHOLE SURVEY SYSTEM UTILIZING STRAPDOWN INERTIAL NAVIGATION 失效
    使用实例导航的井眼调查系统

    公开(公告)号：EP0296204A4

    公开(公告)日：1991-04-17

    申请号：EP88900653

    申请日：1987-12-16

    申请人： SUNDSTRAND DATA CONTROL, INC.

    发明人： HULSING, RAND, H., II

    IPC分类号： E21B47/022 ,  E21B47/024

    CPC分类号： E21B47/022

    摘要： A borehole survey system that utilizes strapdown inertial navigation techniques for mapping a borehole while the system probe (10) is continuously moved along a borehole (12) by means of a cable (14) that is wound on a cable reel (16). Signals representative of the acceleration of the probe (10) relative to the three axes of a probe body coordinate system (34) and signals representative of angular rotation of the probe (10) about the three axes of the probe body coordinate system are processed within the signal processor (24) to obtain signals that represent probe velocity and probe position in a level coordinate system (36) that is fixed in orientation relative to the geographic location of the borehole (12). Precise and continuous surveys are accommodated by correction of the level coordinate probe velocity signals and probe position signals with error correction signals that are based on the difference between inertially derived probe body coordinate position signals representative of the distance traveled by the probe (10) along the borehole (12) and a cable length signal that is derived from a cable measurement apparatus (26), which indicates the amount of cable (14) fed into or retrieved from the borehole (12). Error correction also is provided to correct for Coriolis effect, centrifugal acceleration and variations in the earth's gravitational field as a function of probe depth.

    MULTI-AXIS ANGULAR RATE SENSOR HAVING A SINGLE DITHER AXIS
    5.
    发明公开
    MULTI-AXIS ANGULAR RATE SENSOR HAVING A SINGLE DITHER AXIS 失效
    具有单个轴的多轴角度传感器

    公开(公告)号：EP0342230A4

    公开(公告)日：1991-05-15

    申请号：EP89901220

    申请日：1988-10-25

    申请人： SUNDSTRAND DATA CONTROL, INC.

    发明人： HULSING, RAND, H., II

    IPC分类号： G01P15/11 ,  G01C19/5705 ,  G01C19/5776 ,  G01P15/08 ,  G01P15/14 ,  G01P9/04

    CPC分类号： G01C19/5705 ,  G01C19/5776

    摘要： A Coriolis rate sensor for determining both angular rate and linear acceleration with respect to three orthogonal axes. A first embodiment of the rate sensor (10) includes three pairs of accelerometers (26, 28 and 30) mounted on counter-rotating frame members (20, 22). The accelerometers are mounted with their sensitive axes antiparallel with each other, forming an acute angle with the common axis (40) about which the upper and lower frame members are counter-rotated back and forth in a dither motion. The upper and lower frame members are connected to a baseplate (12) by flex links (32), which are aligned radially about the axis. The flex links provide a relatively rigid support (in compression) between the frame members and the centrally disposed baseplate, yet readily permit counter-rotation of the two frame members. A link (56) prevents all but relative rotational movement between the frame members and baseplate. A pair of electromagnetic coils (42) and pole pieces (50) provide a sinusoidal driving force to counter-rotate the upper and lower frame members relative to each other to ensure that the upper and lower frame members are directly coupled to each other and to the baseplate. In a second embodiment of the rate sensor (100), eight accelerometers (102, 104, 106 and 108) are mounted with two pairs on an upper counter-rotating member and two pairs on a lower counter-rotating member.