Inertia measurement device, vehicle, and electronic device
AssigneeSeiko Epson Corporation
InventorsYusuke Kinoshita, Nobuyuki Imai
Life of this patent
Estimating the term…
Abstract
An inertia measurement device, which is used in combination with a satellite positioning receiver that outputs a positioning result at every T seconds in a positioning system equipped on a vehicle, when a Z-axis angular velocity sensor, a position error P[m] based on the detection signal of the Z-axis angular velocity sensor while the vehicle moves at a moving speed V[m/sec] for T seconds satisfies Pp≥P=(V/Bz)×(1−cos(Bz×T)) (where, a bias error of the Z-axis angular velocity sensor is Bz[deg/sec] and a predetermined allowable maximum position error during movement for T seconds is Pp[m]), and a bias error Bx and By of the Y-axis angular velocity sensor satisfies Bz<Bx and Bz<By.
Claims20
A sensor unit comprising:
- an X-axis angular velocity sensor that detects an angular velocity around the X-axis;
- a Y-axis angular velocity sensor that detects an angular velocity around the Y-axis;
- and
- a Z-axis angular velocity sensor that detects an angular velocity around the Z-axis,
- wherein the Z-axis angular velocity sensor has more sensor elements than the X-axis angular velocity sensor, and
- wherein the Z-axis angular velocity sensor has more sensor elements than the Y-axis angular velocity sensor.
A sensor unit comprising:
- an X-axis angular velocity sensor that detects an angular velocity around the X-axis;
- a Y-axis angular velocity sensor that detects an angular velocity around the Y-axis;
- and
- a Z-axis angular velocity sensor that detects an angular velocity around the Z-axis,
- wherein the Z-axis angular velocity sensor has one or more first sensor elements,
- wherein the X-axis angular velocity sensor has one or more second sensor elements,
- wherein the Y-axis angular velocity sensor has one or more third sensor elements, and
- wherein a number Ngz of the first sensor elements constituting the Z-axis angular velocity sensor is larger than:
- a number Ngx of the second sensor elements constituting the X-axis angular velocity sensor;
- and
- a number Ngy of the third sensor elements constituting the Y-axis angular velocity sensor.
A positioning system comprising:
- an X-axis angular velocity sensor that detects an angular velocity around the X-axis;
- a Y-axis angular velocity sensor that detects an angular velocity around the Y-axis;
- a Z-axis angular velocity sensor that detects an angular velocity around the Z-axis;
- a computation unit that performs calculations based on the first angular velocity signal, the second angular velocity signal, and the third angular velocity signal to output inertial data;
- a reception unit that receives a satellite signal;
- and
- a position synthesis unit that calculates a position based on the inertial data output from the computation unit and the received satellite signal,
- wherein the Z-axis angular velocity sensor has more sensor elements than the X-axis angular velocity sensor, and
- wherein the Z-axis angular velocity sensor has more sensor elements than the Y-axis angular velocity sensor.
Dependencies are inferred from the claim text.