Navigation apparatus and navigation processing method
First Claim
1. A navigation apparatus comprising:
- a speed calculation section that calculates, in accordance with a predetermined calculation method, a current speed of a mobile object at predetermined intervals, based oil the mobile object'"'"'s initial speed detected at the start of the calculation;
a travel distance calculation section that calculates a travel distance the mobile object has traveled so far since the start of the calculation, by using the current speed;
a current speed error range calculation section that calculates, based on the calculation method, a current speed error range of the current speed by using an initial speed error range of the initial speed;
a distance error range calculation section that calculates a travel distance error range of the travel distance by using the current speed error range;
a reliability evaluation section that evaluates, based on the travel distance error range, the reliability of the travel distance; and
a control section that performs a navigation process corresponding to the reliability of the travel distance.
1 Assignment
0 Petitions
Accused Products
Abstract
A navigation apparatus includes: a section that calculates, in accordance with a predetermined calculation method, a current speed of a mobile object at predetermined intervals, based on the mobile object'"'"'s initial speed detected at the start of the calculation; a section that calculates a travel distance the mobile object has traveled so far since the start of the calculation; a section that calculates, based on the calculation method, a current speed error range of the current speed by using an initial speed error range of the initial speed; a section that calculates a travel distance error range of the travel distance by using the current speed error range; a section that evaluates, based on the travel distance error range, the reliability of the travel distance; and a section that performs a navigation process corresponding to the reliability of the travel distance.
10 Citations
12 Claims
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1. A navigation apparatus comprising:
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a speed calculation section that calculates, in accordance with a predetermined calculation method, a current speed of a mobile object at predetermined intervals, based oil the mobile object'"'"'s initial speed detected at the start of the calculation; a travel distance calculation section that calculates a travel distance the mobile object has traveled so far since the start of the calculation, by using the current speed; a current speed error range calculation section that calculates, based on the calculation method, a current speed error range of the current speed by using an initial speed error range of the initial speed; a distance error range calculation section that calculates a travel distance error range of the travel distance by using the current speed error range; a reliability evaluation section that evaluates, based on the travel distance error range, the reliability of the travel distance; and a control section that performs a navigation process corresponding to the reliability of the travel distance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A navigation processing method comprising:
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a speed calculation step cf calculating, in accordance with a predetermined calculation method, a current speed of a mobile object at predetermined intervals, based on the mobile object'"'"'s initial speed detected at the start of the calculation; a travel distance calculation step of calculating a travel distance the mobile object has traveled so far since the start of the calculation, by using the current speed; a current speed error range calculation step of calculating, based on the calculation method, a current speed error range of the current speed by using an initial speed error range of the initial speed; a distance error range calculation step of calculating a travel distance error range of the travel distance by using the current speed error range; a reliability evaluation step of evaluating, based on the travel distance error range, the reliability of the travel distance; and a control step of performing a navigation process corresponding to the reliability of the travel distance. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification