Navigation system

Claim 1

A navigation system for displaying travelling information of a mobile object, comprising: a global positioning system (GPS) information receiver (1) for receiving a radio wave through an antenna (AT) from a plurality of artificial satellites (20) belonging to a GPS, and calculating a pseudo coordinate value of a current position; a sensor information receiver (2) including a gyrosensor and a speed sensor, for sensing a rotary angle of said mobile object and a speed thereof by said gyrosensor and said speed sensor; a current position calculator (3) for calculating a current pseudo position of said mobile object on the basis of said rotary angle and said speed generated from said sensor information receiver (2), and selecting either said pseudo coordinate value of the current position transmitted from said GPS information receiver (1) or said current pseudo position; a map information memory (14) for storing map information and additional information data; an operator (7) having a plurality of function keys selected by a driver; a controller (5) for reading, from said map information memory (4), the map information of a neighboring region on the basis of the travelling information obtained from said current position calculator (3), and generating a control signal so as to display current position information and travelling route information; a display signal generator (8) for receiving said control signal from said controller (5) and generating a display signal for displaying the current position information and the travelling route information; a display unit (6) for displaying the map information about the current position and the travelling route by said display signal generated from said display signal generator (8); and a GPS signal discriminator (9) for judging whether the current position information or the travelling route information is received from 3 satellites or more, said GPS signal discriminator (9) being controlled by said controller (5).

Claim 3

A method for displaying travelling information of a mobile object in a navigation system, said method comprising the steps of: calculating a current position and a travelling route and calculating the number of received satellites; checking whether the number of the received satellites is more than a predetermined number; if the number of the received satellites is less than said predetermined number, displaying the current position of the mobile object received from satellites under said predetermined number; and if the number of the received satellites is more than said predetermined number, displaying the current position of the mobile object received from satellites over said predetermined number.

Claim 6

A method for displaying travelling information of a mobile object in a navigation system, said method comprising the step of: differently displaying travelling route information generated during travelling according to the accuracy of a global positioning system (GPS) signal by checking whether accurate position information is received according to the receiving state of a GPS satellite, thus to cause a driver to be able to confirm current position information varying with the receiving state of the satellite.