×

Gyro sensor module and angular velocity detection method

  • US 7,814,793 B2
  • Filed: 02/04/2008
  • Issued: 10/19/2010
  • Est. Priority Date: 02/05/2007
  • Status: Expired due to Fees
First Claim
Patent Images

1. A gyro sensor module built into a navigation system mounted into a mobile unit, comprising:

  • a first gyro sensor detecting and outputting a first angular velocity ω

    1 around a first detection axis;

    a sign determination circuit for determining a sign of the first angular velocity ω

    1;

    a second gyro sensor detecting and outputting a second angular velocity ω

    2 around a second detection axis intersecting the first detection axis at an acute angle θ

    12;

    a sensor output correction circuit for correcting outputs of the first and second gyro sensors; and

    a computation circuit for computing ω



    by equations ω



    =√



    1

    2+SA2) and SA=(ω

    2



    ω

    1

    cos θ

    12)/sin θ

    12 using a first angular velocity ω

    1′ and

    a second angular velocity ω

    2

    obtained from corrections performed by the sensor output correction circuit, and outputting an angular velocity ω

    obtained by multiplying the ω



    by the sign of the first angular velocity ω

    1 obtained by the sign determination circuit, whereinthe sensor output correction circuit includes;

    a first offset adjustment circuit for outputting a value ω

    1

    obtained by subtracting, from the ω

    1, a correction value B1 corresponding to an output value of the first gyro sensor at a time when the mobile unit in which the gyro sensor module is disposed is stopping; and

    a second offset adjustment circuit for outputting a value ω

    2

    obtained by subtracting, from the ω

    2, a correction value B2 corresponding to an output value of the second gyro sensor at a time when the mobile unit in which the gyro sensor module is disposed is stopping, andthe angular velocity ω

    is an angular velocity around an axis located in a plane including the first and second detection axes and in a range between the first and second detection axes.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×