×

Mobile device for vehicle

  • US 8,232,863 B2
  • Filed: 01/15/2010
  • Issued: 07/31/2012
  • Est. Priority Date: 02/06/2009
  • Status: Active Grant
First Claim
Patent Images

1. A mobile device for a vehicle, the mobile device comprising:

  • a receiving unit configured to receive transmission signals, each of the transmission signals being transmitted from a corresponding one of a plurality of transmitting antennas of a vehicle-side device;

    a control unit configured to determine a distance to each of the plurality of transmitting antennas using a signal strength of a corresponding one of the transmission signals received by the receiving unit; and

    a transmitting unit configured to transmit, to the vehicle-side device, data items indicating the distances to the plurality of transmitting antennas determined by the control unit,wherein, in a time period in which communication is not performed between the mobile device and the vehicle-side device, the control unit measures a signal strength of a signal received by the receiving unit to obtain a measurement value and stores the measurement value as a noise element, and, when communication is performed between the mobile device and the vehicle-side device, the control unit performs correction for noise on the signal strengths of the transmission signals, each of the transmission signals being transmitted from a corresponding one of the plurality of transmitting antennas, and determines the distances to the plurality of transmitting antennas,wherein the control unit compares a distance Lsn calculated using the signal strength of each of the transmission signals including the noise element with a distance Ln calculated using only the noise element, and, when a ratio of the distance Ln to the distance Lsn is larger than a predetermined value, the control unit transmits, as the distance to a corresponding one of the plurality of transmitting antennas, an alternative data item with which malfunction in the vehicle-side device is prevented.

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