Pioneer Electronic Corporation

Hayato Yoshida

Hitoshi Ando

Masaya Adachi

Tsutomu Honda

Masashi Shimakata

Shinichi Takemura

Shigeru Tsujimura

Tohru Yoshihara

Isao Endo

Shozaburo Sakaguchi

Junichi Shibata

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 navigation system for a vehicle which does not bewilder a driver of the vehicle with heading indication also when the driving speed of the vehicle is low. The navigation system comprises a GPS receiver, a display unit, a map memory in which a map is stored, a detecting section for detecting a driving position and a driving direction of the vehicle from information received from the GPS receiver, and a controller. The controller receives information of a driving speed of the vehicle from the vehicle and controls, when the driving speed is equal to or higher than a preset speed, the display unit to indicate on a display screen thereof the driving position and driving direction of the vehicle received from the detecting section together with the map received from the map memory, but controls, when the driving speed is lower than the preset speed, the display unit to indicate only the driving position of the vehicle received from the detecting section together with the map received from the map memory.

Navigation system for vehicle

A satellite signal tracking system for a GPS receiver, wherein a GPS satellite is recaptured within a very short period of time, after the interruption of reception is cleared as by passing through a tunnel and the like, by widening a band width of the PLL search frequency gradually every after repeating the search for the satellite signal, performing a narrow-band search repeatedly as varying its center frequency along the Doppler shift curve, performing a narrow-band search for a specific period of time which is given by dividing the capture range of the PLL circuit by the Doppler shift rate and a wide-band search with use of an estimated satellite signal receiving frequency which is given by recalculating the Doppler frequency of the GPS satellite at the very moment according to the almanac data of the GPS satellite and is assigned as the center frequency, and, still further, performing the search for GPS satellites repeatedly with the estimated satellite signal receiving frequency in the center for recovering the function to perform the positional reckoning which is the primary function of the GPS receiver.

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Saitama, Japan

Hayato Yoshida