Fujitsu Ten Limited

Other

Atsushi Ichimura

Hiroshi Takeuchi

Yasuhiro Nakatani

Masatsugu Kamimura

Jyunichi Yamamoto

Hironobu Sugimoto

Masahiro Kimura

Hidetoshi Fujimoto

Isao Ogawa

Toshio Tanaka

Hidenobu Suzuki

Yasuhiro Tooyama

Mamoru Kainuma

Yoichi Okano

In a mobile object location providing device, time required for distribution of distribution data per kind of the communicating unit is stored, a current location and a movement history of a mobile object is calculated, distribution time that is time required for distributing the distribution for a communicating unit is estimated based on the distribution condition information, and a future location of a mobile object after lapse of the distribution time is estimated based on use of the movement history, and a requests is made for distributing area information of an area surrounding the future location.

Mobile object location providing device and mobile object location providing system

Branch-point image data has coordinates added thereto according to the distance from a branch point such as an intersection. When the vehicle is within a predetermined distance from a branch point on a suggested route, the coordinates of the present position of the vehicle and the coordinates added to the branch-point image data are compared to locate the present position on the image data, and a present-position mark is displayed superimposed on the branch-point image data. The displayed present-position mark moves according to the distance between the vehicle and the branch point.

Navigation system and storage medium

The navigation apparatus gives, to a map match processing portion, the measured present location and progress bearing of the vehicle with the use of the position bearing measuring portion for each predetermined period. The map match processing portion reads out the road data about the road close to the measured present position from the memory apparatus to effect the map match processing with respect to each link in accordance with the road data for correcting the measured present position. The correcting operation is effected only when the frequency, where the similarity degree with respect to the measured present position and progress bearing at this time is judged to be larger than the predetermined threshold value, is larger than the predetermined constant Ck. The road data are visually displayed on the visual displaying region of the displaying apparatus. The predetermined diagrams are displayed in a superimposed manner, in the corrected present position, on the road data visually displayed.

Vehicle position detecting apparatus

A processing apparatus within a navigation system comprises a track calculating portion for subsequently memorizing a bearing detected by a bearing sensor to calculate a track, and a map match processing portion for performing the map matching process. A position correcting portion corrects a vehicle position onto a road in accordance with road data 35 by the map match processing portion 34. The bearing correction is not effected when the bearing difference conditions are established although a bearing correcting portion 39 corrects the bearing showing the progressive direction of the vehicle into the link bearing of the road. The bearing difference condition is a condition where the bearing difference between the link bearing and the bearing showing the progressive direction of the vehicle is large, and there is a possibility of further increasing the error when the error of the bearing showing the progressive direction of the vehicle is large and the correction is effected in the link bearing. The offset correction can be carried out precisely with proper timing when a gyroscopic device is used as the bearing sensor.

Navigation system and gyroscopic device

A method and an apparatus for guidance of a road condition for providing prospective information concerning a configuration of a forthcoming curve or intersection on a traveling route for ensuring safe driving, particularly in the dark or roads such as winding roads, mountainous roads and so forth. The apparatus includes a detecting circuit for detecting a traveling link among a plurality of links in road information on which a vehicle is traveling; a circuit for detecting an instantaneous position of the vehicle and a traveling direction of the vehicle; and a circuit for calculating a distance from the instantaneous vehicle position to a forthcoming end of the traveling link on the basis of the instantaneous vehicle position and the traveling direction. In addition, the apparatus includes a circuit for detecting a number of intersecting links connected to the forthcoming end of the traveling link; a circuit for calculating an intersecting angle at the forthcoming end of the traveling link with the intersecting links, and a circuit for displaying information concerning curvature at the intersection of the links.

Method and apparatus for guidance of road condition

The present invention involves a direction sensor and a navigation system containing the direction sensor. The direction sensor has an earth magnetism sensor and a rate gyro sensor that calculates a compensated direction by weighted means process of the outputs from the earth magnetism sensor and the rate gyro sensor. The compensated direction has a high detection accuracy similar to the rate gyro sensor over a short time period, but does not have an error accumulation of the rate gyro sensor during a long time interval because the rate gyro sensor is substantially calibrated with the accurate direction obtained by the averaging outputs of the earth magnetism sensor. The navigation system has distribution information of the magnetic disturbances to the earth magnetism on a map and it reduces the weighted mean ration to the earth magnetism sensor when the magnetic disturbance at the locating position is large. The accuracy of the compensated direction is further improved by excluding inaccurate outputs of the earth magnetism sensor.

Growing community of inventors

Kobe, Japan

Atsushi Ichimura