Navigation system with figure of merit determination
First Claim
1. A method for operating a vehicle navigation system including the steps of:
- a) calculating a current position solution;
b) calculating a figure of merit of the current position solution; and
c) changing an operational mode based upon the figure of merit when the figure of merit drops below a predetermined threshold, wherein said step c) further includes the step of disabling an automatic route recalculation based upon the figure of merit, and wherein said c) further including the step of disabling automatic route recalculation when the figure of merit drops below a predetermined threshold.
6 Assignments
0 Petitions
Accused Products
Abstract
A navigation system switches to a different operational mode based upon a figure of merit determination of the current position solution by the navigation system relative to the map database. If the vehicle navigation system is guiding a driver along a recommended route, and the figure of merit drops below a first predetermined threshold, the navigation system disables an automatic route recalculation routine. If the figure of merit drops below a second predetermined threshold while the vehicle is in route guidance mode, the navigation system displays a textual display of the turn-by-turn instructions along the recommended route to the destination. If the vehicle navigation system is not in a route guidance mode and the figure of merit drops below a third predetermined threshold, the navigation system displays a map of the area surrounding the last current position solution, without displaying the current position of the vehicle.
52 Citations
21 Claims
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1. A method for operating a vehicle navigation system including the steps of:
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a) calculating a current position solution;
b) calculating a figure of merit of the current position solution; and
c) changing an operational mode based upon the figure of merit when the figure of merit drops below a predetermined threshold, wherein said step c) further includes the step of disabling an automatic route recalculation based upon the figure of merit, and wherein said c) further including the step of disabling automatic route recalculation when the figure of merit drops below a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A navigation system comprising:
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at least one navigation sensor generating a position signal;
a processor determining a current position based upon the position signal, said processor determining a figure of merit of the current position, said processor changing an operational mode of the navigation system based upon the figure of merit when said processor determines that the figure of merit has dropped below a predetermined threshold, including a display, said display including a plurality of display modes, said navigation system changing said display modes based upon said figure of merit, wherein said navigation system switches between a turn-by-turn route guidance mode and a maneuver list mode in which said display displays a textual list of a plurality of maneuvers in the recommended route based upon the figure of merit. - View Dependent Claims (10, 11, 12, 13)
a user input device permitting a user to select a destination;
said processor calculating a recommended route to the destination, said processor including an automatic route recalculation mode in which a new route to the destination is calculated based upon the processor determining that the current position is no longer on the recommended route, said processor disabling said automatic route recalculation based upon said figure of merit.
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12. The navigation system of claim 11 wherein said display switches between displaying the current position on a map and displaying the map without the current position based upon the figure of merit.
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13. The navigation system of claim 9 wherein said navigation system switches between a turn-by-turn route guidance mode and a maneuver list mode in which said display displays a textual list of a plurality of maneuvers in the recommended route based upon the figure of merit.
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14. A method of operating a vehicle navigation system including the steps of:
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a) calculating a current position;
b) determining a confidence level in the current position;
c) disabling an automatic route recalculation based upon the figure of merit; and
d) changing an operational mode based upon the figure of merit when the figure of merit drops below a predetermined threshold. - View Dependent Claims (15, 16, 17)
selecting a destination and calculating a recommended route to the destination before said step c); and
determining that the current position is not on the recommended route.
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16. The method of claim 14 further including the steps of:
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selecting a destination and calculating a recommended route to the destination before said step c);
determining that the current position is not on the recommended route before said step c); and
automatically calculating a new recommended route to the destination before said step c).
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17. The method of claim 14 wherein said navigation system switches between a turn-by-turn route guidance mode and a maneuver list mode in which said display displays a textual list of a plurality of maneuvers in the recommended route based upon the figure of merit.
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18. A method for operating a vehicle navigation system including the steps of:
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a) calculating a current position solution;
b) calculating a figure of merit of the current position solution; and
c) changing an operational mode based upon the figure of merit when the figure of merit drops below a predetermined threshold, wherein said step c) further includes the step of disabling an automatic route recalculation based upon the figure of merit, and wherein said step c) further including the step of disabling automatic route recalculation when the figure of merit drops below a predetermined threshold, wherein at least one navigation sensor generation a position signal;
a processor determining a current position based upon the position signal, said processor determining a figure of merit of the current position, said processor changing an operational mode of the navigation system based upon the figure of merit when said processor determines that the figure of merit has dropped below a predetermined threshold, including a display, said display including a plurality of display modes, said navigation system changing said display modes based upon said figure of merit, wherein said navigation system switches between a turn-by-turn route guidance mode and a maneuver list mode in which said display displays a textual list of plurality of maneuvers in the recommended route based upon the figure of merit, wherein further including the step of calculating a recommended route to a destination and further including the step of displaying textual instructions along the recommended route based upon the figure of merit.
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19. A method for operating a vehicle navigation system including the steps of:
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a) calculating a current position solution;
b) calculating a figure of merit of the current position solution; and
c) changing an operational mode based upon the figure of merit when the figure of merit drops below a predetermined threshold, wherein said step c) further includes the step of disabling an automatic route recalculation based upon the figure of merit, and wherein said step of c) further including the step of disabling automatic route recalculation when the figure of merit drops below a predetermined threshold, further including the step of calculating a recommended route to a destination, further including the step of displaying textual instructions also the recommended route based upon the figure of merit.
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20. A method for operating a vehicle navigation system including the steps of:
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a) calculating a current position solution;
b) calculating a figure of merit of the current position solution; and
c) changing an operational mode based upon the figure of merit when the figure of merit drops below a predetermined threshold, wherein said step c) further includes the step of disabling an automatic route recalculation based upon the figure of merit, and wherein said step c) further including the step of disabling automatic route recalculation when the figure of merit drops below a predetermined threshold, further including the step of displaying textual instructions along the recommended route based upon the figure of merit. - View Dependent Claims (21)
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Specification