Alps Electric Co., Ltd.

Tadashi Mukai

Teruo Mimori

Toshio Sasaki

Akira Ichikawa

Shinichiro Yasui

Masashi Fuse

Kenji Takahashi

Itaru Hatano

Mikio Kanda

Shigeru Hirosawa

Tsuneo Takahashi

Noboru Tsushima

Thuneo Takahashi

Masayuki Ogata

Noburu Tsushima

A current location updating display for indicating the current location of moving members such as an automobile while updating from time to time based on output from a magnetic azimuth sensor adapted to detect the azimuth of terrestrial magnetism. Output signals from the magnetic azimuth sensor are stored in a data memory after A/D conversion and correction, and a predetermined amount of data read out from the data memory is subject to the averaging processing. With this, plural angle information (sin .theta. and cos .theta.) signals or plural angle (.theta.) signals are averaged out including a signal corresponding to disturbance magnetism. Thus average data signals are integrated by an integrator and then sent to a display portion. Through the averaging processing an azimuthal error is restrained as small as possible, so that the current location or running path of the moving member may be indicated correctly.

Vehicle location display device with averaging means for correcting

In a course guidance system for use in an automobile, for example, which includes an electronic display, a map, a direction sensor, a speed sensor and the like for deriving the present location of the car and plotting it on the display, the invention provides a course guidance system for a car which causes a linear and/or rotational movement of the driving locus displayed on the display when the map is changed or reset so that the present position can be easily located on the map.

Course guidance system

A course guidance system includes a direction sensor and a speed sensor both fitted to a moving body, a display mounted in the moving body and a map displayed in a manner corresponding to the display surface of the display and in which the present position of the moving body is derived by the direction sensor and the speed sensor and is plotted on the display in a manner corresponding to the map. The improvement comprises a locus memory for sequentially storing an X component value and a Y component value of the driving position based on a predetermined driving distance obtained from the speed sensor and on the driving position obtained from the direction sensor, a locus display memory for storing data in a manner corresponding to the display surface of the display, the data being obtained by reading the contents of the locus memory in a manner corresponding to the scale of reduction of the map, and a display for plotting the driving locus of the moving body on the display surface based on the contents of the locus display memory, wherein the data to be read when the contents of the locus memory is transferred to the locus display memory are divided into a plurality of groups each consisting of a data line to be read at a predetermined interval which are sequentially read and transferred, and the plotted line of the driving locus to be displayed is displayed sequentially and progressively from a rough display to a dense display.

Course guidance system with speeded-up display function

Disclosed is a magnetic course detector capable of accurately detecting the bearing of the course of a traveling body independently of the position a magnetic bearing sensor is installed in the traveling body through rotatably mounting the magnetic bearing sensor and making corrections for the offset and sensitivity of its output.

Magnetic course detector

Growing community of inventors

Tokyo, Japan

Tadashi Mukai