| 摘要 |
PROBLEM TO BE SOLVED: To improve visibility of a map displayed in a heading-up mode in a navigation system for a vehicle. SOLUTION: The navigation system comprises: displaying to read partial map information including a position as a center from DVD 17 by finding the current position of one's own vehicle at everyΔt (S4-S11), storing current position information to RAM 12 at every (5*Δt) (S12-S15 to S2); finding an inclined angleθ(i) of an approximate straight line by applying a method of a linear least square concerning just near six-position information stored to RAM 12 (S12, S16); and displaying to rotate a partial map read from DVD by only an angle of ä(π/2)-θ(i)} (S17, S18). The navigation system suppresses a change rate of a rotation angle of the map small and achieves the display of a navigation screen superior in visibility by performing smooth rotation display relaxed always. COPYRIGHT: (C)2007,JPO&INPIT |
