Pioneer Electronic Corporation

Shigeru Tsujimura

Masashi Shimakata

Hitoshi Ando

Tsutomu Honda

Masaya Adachi

Shinichi Takemura

Hayato Yoshida

Tohru Yoshihara

Toshiaki Tsuchiya

Tooru Yoshihara

A navigation apparatus for a vehicle using a GPS (Global Positioning System) as sensing means in which information on the basis of sensing results, such as a present position, a running locus and the like are displayed in a predetermined form of display on a display section is disclosed. In cases where the GPS receiver cannot receive radio waves from artificial satellites, and sensing thus becomes disabled, a sensed final present position is displayed with an altered form of display.

Navigation apparatus for vehicles

A navigation apparatus for a vehicle using a GPS (Global Positioning System) as sensing means in which information on the basis of sensed results, such as a present position, a running locus and the like are displayed in a predetermined form of display on a display section is disclosed. In cases where the GPS receiver cannot receive radio waves from artificial satellites, and sensing thus becomes disabled, a sensed final present position is displayed with an altered form of display.

A GPS receiver and related method for positioning on the Globe. The GPS receiver receives satellite signals in a sequential manner with a plurality of antennas, whereby any of the plurality of antennas which receives satellite signals from the maximum number of GPS satellites is selected by an antenna switching unit under the control of a control unit, a combination of GPS satellites having the smallest PDOP value or the signal strength in due order is selected by the control unit from among all of GPS satellites in contact with respective antennas when each of the antennas fails to receive satellite signals transmitted by the predetermined minimum number of GPS satellites. The related positioning method is for use with a motor vehicle-mounted GPS receiver having a plurality of receiving channels, wherein each receiving channel independently receives satellite signals from the GPS satellites in contact, a required number of GPS satellites which are currently considered to be the most suitable for positioning in view of PDOP value are selected from among all of GPS satellites in contact through each receiving channel, and thereby a GPS satellite other than the selected ones may be substituted for the obstructed GPS satellite for carrying out the positioning by making use of navigation data of the newly selected GPS satellite without any intermission.

Apparatus and method for positioning of a GPS receiver

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Saitama, Japan

Shigeru Tsujimura