Patent ID: 8510044

Claim:
A position sensing device for detecting a current position of a vehicle, comprising: a dead reckoning unit for determining a position of the vehicle by calculation based on dead reckoning at a predetermined cycle; a GPS receiver; a correction unit for executing correction processing for correcting a position determination result obtained through dead reckoning and for correcting a vehicle speed, a pitch angle, and a sensor mounting angle used in position determination executed through dead reckoning, wherein the correction processing is executed in accordance with multi-dimensional direction-specific positional components and speed components of the vehicle which are measured with the GPS receiver in a measurement period of the GPS receiver which is longer than the predetermined cycle; and a GPS data determination unit for determining a reliability of each of the multi-dimensional direction-specific positional components and speed components of the vehicle, which are measured with the GPS receiver, and calculating an error index of each component determined to be a reliable component, wherein the correction unit includes a unit for setting a degree of contribution of each measurement component determined to be an unreliable component to the correction processing to zero or almost zero, and reducing the degree of contribution of each measurement component determined to be a reliable component to the correction processing in accordance with a value of the error index.