Satellite navigation controller
First Claim
1. A satellite navigation controller tat controls a receiver for satellite navigation, wherein the receiver is able to receive signals having individual chip rates from satellites to thereby execute position determination with at least two different accuracies including a higher accuracy and a lower accuracy, the chip rate being a speed of spreading code for subjecting the signal to spreading modulation and de-spreading demodulation, the satellite navigation controller comprising:
- a chip rate switching unit configured to switch between at least two chip rates including a higher chip rate and a lower chip rate, each chip rate being corresponded to by one of the at least two accuracies, the higher chip rate corresponding to the higher accuracy while needing a processing load and power consumption higher than the lower chip rate;
a determining unit configured to determine a first accuracy, which is one of the at least two accuracies, the first accuracy at which the receiver should be caused to execute position determination; and
a controlling unit configured to cause the chip rate switching unit to switch to a first chip rate of the at least two chip rates, the first chip rate being corresponded to by the first accuracy, to thereby allow the receiver to execute position determination with the first accuracy and prohibit decoding signals from the satellites for executing position determination with a second accuracy, which is different than the first accuracy of the at least two accuracies.
1 Assignment
0 Petitions
Accused Products
Abstract
A navigation device changes a position determination accuracy of a receiver for satellite navigation to a higher accuracy in the following cases: when the subject vehicle approaches a destination, the subject vehicle runs on a road not described in map information, when the subject vehicle approaches an intersection at which the road is branched at a narrow angle within a predetermined distance, when the subject vehicle is running on a narrow street, when the subject vehicle is running on one of adjacent parallel roads, when self-contained sensors are calibrated, and other like occasions. In the other cases, the navigation device changes the position determination accuracy of the receiver to a low accuracy. When the receiver is caused to execute low-accuracy position determination, power supply to receiver'"'"'s operation required only for high-accuracy position determination is prohibited.
36 Citations
17 Claims
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1. A satellite navigation controller tat controls a receiver for satellite navigation, wherein the receiver is able to receive signals having individual chip rates from satellites to thereby execute position determination with at least two different accuracies including a higher accuracy and a lower accuracy, the chip rate being a speed of spreading code for subjecting the signal to spreading modulation and de-spreading demodulation, the satellite navigation controller comprising:
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a chip rate switching unit configured to switch between at least two chip rates including a higher chip rate and a lower chip rate, each chip rate being corresponded to by one of the at least two accuracies, the higher chip rate corresponding to the higher accuracy while needing a processing load and power consumption higher than the lower chip rate; a determining unit configured to determine a first accuracy, which is one of the at least two accuracies, the first accuracy at which the receiver should be caused to execute position determination; and a controlling unit configured to cause the chip rate switching unit to switch to a first chip rate of the at least two chip rates, the first chip rate being corresponded to by the first accuracy, to thereby allow the receiver to execute position determination with the first accuracy and prohibit decoding signals from the satellites for executing position determination with a second accuracy, which is different than the first accuracy of the at least two accuracies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A positioning system used in a navigation device for a vehicle, the system comprising:
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a receiver for satellite navigation to receive signals having individual chip rates from satellites to thereby execute position determination, the chip rate being a speed of spreading code for subjecting the signal to spreading modulation and de-spreading demodulation, the receiver including; a chip rate switching unit configured to facilitate switching at least two chip rates therebetween, each chip rate being corresponded to by one of the at least two accuracies; a first positioning unit configured to facilitate determining a position of the vehicle with a first chip rate corresponded to by a first accuracy having a first measurement error, the second chip rate needing a processing load and power consumption higher than the first chip rate; and a second positioning unit configured to facilitate determining a position of the vehicle with a second chip rate corresponded to by a second accuracy having a second measurement error lower than the first measurement error; and a satellite navigation controller configured to control the receiver based on signals from satellites for satellite navigation, the satellite navigation controller including; a chip rate switching unit configured to switch the first chip rate and the second chip rate therebetween; a determining unit configured to determine one of the two accuracies for executing position determination; and a controlling unit configured to cause the chip rate switching unit to switch to one of the two chip rates corresponded to by the one of the two accuracies determined, to thereby allow the receiver to execute position determination with the one of the two accuracies determined and prohibit decoding signals from the satellites for executing position determination with, of the two accuracies, another accuracy different from the one of the two accuracies determined. - View Dependent Claims (17)
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Specification