Clarion Co

Zhixing Liu

Toshiyuki Aoki

Akihiro Kawabata

Kazuhiro Okada

Tomoaki Hiruta

Takayoshi Yokota

Mikio Bando

Koichi Kato

Hiroyuki Kohida

A distance factor learning device includes: a first learner that updates a first estimated value for the distance factor and a first parameter, based upon a measurement quantity, which is calculated based upon the vehicle speed pulses and the GPS information, the first estimated value for the distance factor and the first parameter; a second learner that updates a second estimate a value for the distance factor and a second parameter, based upon the measurement quantity, which is calculated based upon the vehicle speed pulses and the GPS information, the second estimated value for the distance factor and the second parameter; a difference calculation unit that calculates a difference between the first estimated value and the second estimated value; and an arithmetic operation control unit that overwrites the first parameter and the first estimated value at the first learner with the second parameter and the second estimated value at the second learner when the difference between the first estimated value and the second estimated value, having been calculated, is equal to or greater than a predetermined value.

Distance factor learning device, distance factor learning method and current position calculating device

A navigation apparatus includes: a map information storage unit that stores road information; a position estimation unit that estimates the position of the vehicle; a map matching unit that specifies link candidate points corresponding to the position of the vehicle; a parallel roads determination unit that detects links of parallel roads that extend mutually parallel to one another; a traveling link determination unit that, for each link of the parallel roads, determines whether it is a traveling link upon which the vehicle is traveling, or a parallel link that extends parallel to the traveling link; and a link position correction unit that obtains position correction amounts for nodes of the traveling link and of the parallel link on the basis of the distance between the link candidate point that corresponds to the traveling link and the position of the vehicle.

Navigation apparatus

A position estimation device includes: a mathematical expression model processing unit that calculates a position of a mobile object, a condition quantity indicating a moving condition of the mobile object and an error in the condition quantity through filtering processing executed by using a probability model based upon an attitude information and a positioning information of the mobile object having been obtained from sensors and a specific mathematical expression model among a plurality of mathematical expression models expressing behavior of the mobile object; a threshold calculation unit that calculates a threshold candidate value for a threshold value to be used as a criterion when selecting the specific mathematical expression model, by using the error; a threshold value determining unit that determines the threshold value based upon the threshold candidate value; and a mathematical expression model selection unit that selects the specific mathematical expression model based upon the threshold value.

Position estimation device and position estimation method

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Tokyo, Japan

Zhixing Liu