Mobile terminal device for positioning system based on magnetic field map and method thereof
A mobile terminal device for a positioning system based on a magnetic field map and a method thereof, are provided. The mobile terminal includes a memory configured to store a magnetic field map including magnetic field values at positions. The mobile terminal further includes a magnetic field sensor configured to measure a magnetic field value at a position of the mobile terminal. The mobile terminal further includes an inertial measurement unit (IMU) sensor configured to measure an acceleration value and a gyro value of the mobile terminal. The mobile terminal further includes a processor configured to determine the position of the mobile terminal based on the magnetic field map, the magnetic field value, the acceleration value, and the gyro value.
1. A mobile terminal for a magnetic field map-based positioning system, comprising:
a memory configured to store a magnetic field map comprising magnetic field values at positions;
a magnetic field sensor configured to measure a magnetic field value at a position of the mobile terminal;
an inertial measurement unit (IMU) sensor configured to measure an acceleration value and a gyro value of the mobile terminal; and
a processor configured to correct the measured magnetic field value based on the acceleration value and the gyro value and to determine the position of the mobile terminal based on the magnetic field map and the corrected magnetic field value.
2. The mobile terminal of claim 1 , wherein the gyro value comprises a rotation value and an orientation value of the mobile terminal.
3. The mobile terminal of claim 1 , wherein the processor is further configured to determine a tilt error of the mobile terminal based on the acceleration value and the gyro value and to correct the measured magnetic field value based on the tilt error.
4. The mobile terminal of claim 3 , wherein the tilt error comprises a pitch, a roll, and a yaw of the mobile terminal.
5. The mobile terminal of claim 1 , wherein the processor is further configured to determine the position of the mobile terminal based on a particle filter, or a Kalman filter, or Markov localization, or any combination thereof.
6. A positioning method for a magnetic field map-based positioning system, comprising:
measuring a magnetic field value at a position of a mobile terminal;
measuring an acceleration value and a gyro value of the mobile terminal;
correcting the measured magnetic field value based on the acceleration value and the gyro value; and
determining the position of the mobile terminal based on a magnetic field map comprising magnetic field values at positions and the corrected magnetic field value.
7. The method of claim 6 , wherein the gyro value comprises a rotation value and an orientation value of the mobile terminal.
8. The method of claim 6 , wherein correcting the magnetic field value comprises:
determining a tilt error of the mobile terminal based on the acceleration value and the gyro value; and
correcting the measured magnetic field value based on the tilt error.
9. The method of claim 8 , wherein the tilt error comprises a pitch, a roll, and a yaw of the mobile terminal.
10. A non-transitory computer-readable storage medium storing a program comprising instructions to implement the method of claim 6 .
11. A mobile terminal for a magnetic field map-based positioning system, comprising:
a memory configured to store a magnetic field map comprising magnetic field values at positions;
a magnetic field sensor configured to measure a magnetic field value at a position of the mobile terminal;
an inertial measurement unit (IMU) sensor configured to measure an acceleration value and a gyro value of the mobile terminal; and
a processor configured to determine the position of the mobile terminal based on the magnetic field map, the measured magnetic field value, the acceleration value and the gyro value.