| 摘要 |
PURPOSE:To quickly return satellite navigation to a correct position after re- starting the navigation by making the position by a satellite navigation means prior to a position by an estimation navigation means when a corrected position by manual operation is considerably erroneous. CONSTITUTION:An estimation navigation means 3 calculates a position of a moving body from an azimuth and a travel distance, while a satellite navigation means receives navigation electric waves from an artificial satellite to obtain a reception position. When it is known that the position is considerably erroneous while the position of the moving body is detected by the means 3 and the position is corrected 10 by manual operation to continue the movement, a composite navigation means 8 obtains a difference between position data obtained by the means 5 subsequently and position data by the means 3. When the difference is a predetermined value or larger, the position data by the means 5 takes priority and is made to be the moving body position, so that the position can be quickly converged to a correct position with data received again from the means 5 even if the position correction has been erroneous. |
