Method of and apparatus for detecting vehicle speed pulse drop, on-vehicle navigation system, program storage device and computer data signal embodied in carrier wave
First Claim
1. A method of detecting a vehicle speed pulse drop of a vehicle speed pulse in an on-vehicle navigation system, said system comprising a radio wave positioning apparatus and a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning, said method comprising:
- a first calculation process of calculating a first physical quantity of a predetermined type from radio wave positioning data of the radio wave positioning apparatus;
a second calculation process of calculating a second physical quantity of the predetermined type from the vehicle speed pulse; and
a detection process of detecting the vehicle speed pulse drop by using a contradiction caused between the calculated first physical quantity and the calculated second physical quantity as a detection condition.
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Accused Products
Abstract
An on-vehicle navigation system is provided with a radio wave positioning apparatus (18) and a vehicle speed sensor (13) for a dead reckoning positioning. A method of detecting a vehicle speed pulse drop of a vehicle speed pulse generated by the vehicle speed sensor is provided with: a first calculation process of calculating a first physical quantity of a predetermined type such as a velocity or the like from radio wave positioning data of the radio wave positioning apparatus; a second calculation process of calculating a second physical quantity of the same type as the first physical quantity from the vehicle speed pulse; and a detection process of detecting the vehicle speed pulse drop by using a contradiction caused between the calculated first physical quantity and the calculated second physical quantity as a detection condition.
14 Citations
29 Claims
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1. A method of detecting a vehicle speed pulse drop of a vehicle speed pulse in an on-vehicle navigation system, said system comprising a radio wave positioning apparatus and a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning, said method comprising:
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a first calculation process of calculating a first physical quantity of a predetermined type from radio wave positioning data of the radio wave positioning apparatus;
a second calculation process of calculating a second physical quantity of the predetermined type from the vehicle speed pulse; and
a detection process of detecting the vehicle speed pulse drop by using a contradiction caused between the calculated first physical quantity and the calculated second physical quantity as a detection condition. - View Dependent Claims (2, 3, 10)
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4. A method of detecting a vehicle speed pulse drop of a vehicle speed pulse in an on-vehicle navigation system, said system comprising a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning, said method comprising:
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a measurement process of measuring a pulse interval between the vehicle speed pulses generated by the vehicle speed sensor;
a first hold process of at least temporarily holding a pulse interval measured for the n-th time (n is a natural number) by said measurement process; and
a detection process of detecting the vehicle speed pulse drop by using such a condition that a ratio of a pulse interval measured for the (n+m)-th time (m is a natural number) with respect to the pulse interval held by said first hold process is more than a predetermined threshold value as a detection condition. - View Dependent Claims (5, 6, 11, 14, 15, 21, 22)
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7. A method of detecting a vehicle speed pulse drop of a vehicle speed pulse in an on-vehicle navigation system, said system comprising a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning, said method comprising:
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a measurement process of measuring a pulse interval between the vehicle speed pulses generated by the vehicle speed sensor;
a prediction process of predicting a generation time of the vehicle speed pulse, which is generated by the vehicle speed sensor and which defines an end of the pulse interval supposed to be measured for the (n+m)-th time (n and m are both natural numbers) by said measurement process, from the pulse interval measured for the n-th time by said measurement process; and
a detection process of detecting the vehicle speed pulse drop, by using such a condition that the vehicle speed pulse is not generated by the vehicle speed pulse sensor even after it has elapsed the predicted generation time. - View Dependent Claims (8, 9, 12)
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13. An apparatus for detecting a vehicle speed pulse drop of a vehicle speed pulse in an on-vehicle navigation system, said system comprising a radio wave positioning apparatus and a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning, said apparatus comprising:
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a first calculation device for calculating a first physical quantity of a predetermined type from radio wave positioning data of the radio wave positioning apparatus;
a second calculation device for calculating a second physical quantity of the predetermined type from the vehicle speed pulse; and
a detection device for detecting the vehicle speed pulse drop by using a contradiction caused between the calculated first physical quantity and the calculated second physical quantity as a detection condition.
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16. An apparatus for detecting a vehicle speed pulse drop of a vehicle speed pulse in an on-vehicle navigation system, said system comprising a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning, said apparatus comprising:
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a measurement device for measuring a pulse interval between the vehicle speed pulses generated by the vehicle speed sensor;
a first hold device for at least temporarily holding a pulse interval measured for the n-th time (n is a natural number) by said measurement device; and
a detection device for detecting the vehicle speed pulse drop by using such a condition that a ratio of a pulse interval measured for the (n+m)-th time (m is a natural number) with respect to the pulse interval held by said first hold device is more than a predetermined threshold value as a detection condition.
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17. An apparatus for detecting a vehicle speed pulse drop of a vehicle speed pulse in an on-vehicle navigation system, said system comprising a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning, said apparatus comprising:
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a measurement device for measuring a pulse interval between the vehicle speed pulses generated by the vehicle speed sensor;
a prediction device for predicting a generation time of the vehicle speed pulse, which is generated by the vehicle speed sensor and which defines an end of the pulse interval supposed to be measured for the (n+m)-th time (n and m are both natural numbers) by said measurement device, from the pulse interval measured for the n-th time by said measurement device; and
a detection device for detecting the vehicle speed pulse drop, by using such a condition that the vehicle speed pulse is not generated by the vehicle speed pulse sensor even after it has elapsed the predicted generation time.
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18. An on-vehicle navigation system comprising:
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an apparatus for detecting a vehicle speed pulse drop of a vehicle speed pulse in an on-vehicle navigation system, said system comprising a radio wave positioning apparatus and a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning, said apparatus comprising;
a first calculation device for calculating a first physical quantity of a predetermined type from radio wave positioning data of the radio wave positioning apparatus;
a second calculation device for calculating a second physical quantity of the predetermined type from the vehicle speed pulse; and
a detection device for detecting the vehicle speed pulse drop by using a contradiction caused between the calculated first physical quantity and the calculated second physical quantity as a detection condition;
the vehicle speed sensor;
a correction device for applying a correction onto the vehicle speed pulse when the vehicle speed pulse drop is detected by said apparatus for detecting the vehicle speed pulse drop; and
a display device for displaying a current position based on the vehicle speed pulse.
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19. An on-vehicle navigation system comprising:
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an apparatus for detecting a vehicle speed pulse drop of a vehicle speed pulse in an on-vehicle navigation system, said system comprising a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning, said apparatus comprising;
a measurement device for measuring a pulse interval between the vehicle speed pulses generated by the vehicle speed sensor, a first hold device for at least temporarily holding a pulse interval measured for the n-th time (n is a natural number) by said measurement device; and
a detection device for detecting the vehicle speed pulse drop by using such a condition that a ratio of a pulse interval measured for the (n+m)-th time (m is a natural number) with respect to the pulse interval held by said first hold device is more than a predetermined threshold value as a detection condition;
the vehicle speed sensor;
a correction device for applying a correction onto the vehicle speed pulse when the vehicle speed pulse drop is detected by said apparatus for detecting the vehicle speed pulse drop; and
a display device for displaying a current position based on the vehicle speed pulse.
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20. An on-vehicle navigation system comprising:
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an apparatus for detecting a vehicle speed pulse drop of a vehicle speed pulse in an on-vehicle navigation system, said system comprising a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning, said apparatus comprising;
a measurement device for measuring a pulse interval between the vehicle speed pulses generated by the vehicle speed sensor;
a prediction device for predicting a generation time of the vehicle speed pulse, which is generated by the vehicle speed sensor and which defines an end of the pulse interval supposed to be measured for the (n+m)-th time (n and m are both natural numbers) by said measurement device, from the pulse interval measured for the n-th time by said measurement device; and
a detection device for detecting the vehicle speed pulse drop, by using such a condition that the vehicle speed pulse is not generated by the vehicle speed pulse sensor even after it has elapsed the predicted generation time;
the vehicle speed sensor;
a correction device for applying a correction onto the vehicle speed pulse when the vehicle speed pulse drop is detected by said apparatus for detecting the vehicle speed pulse drop; and
a display device for displaying a current position based on the vehicle speed pulse. - View Dependent Claims (23)
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24. A program storage device readable by a computer for tangibly embodying a program of instructions executable by the computer to perform method processes of detecting a vehicle speed pulse drop of a vehicle speed pulse in an on-vehicle navigation system, said system comprising a radio wave positioning apparatus and a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning,
said method processes comprising: -
a first calculation process of calculating a first physical quantity of a predetermined type from radio wave positioning data of the radio wave positioning apparatus;
a second calculation process of calculating a second physical quantity of the predetermined type from the vehicle speed pulse; and
a detection process of detecting the vehicle speed pulse drop by using a contradiction caused between the calculated first physical quantity and the calculated second physical quantity as a detection condition..
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25. A program storage device readable by a computer for tangibly embodying a program of instructions executable by the computer to perform method processes of detecting a vehicle speed pulse drop with reference to a vehicle speed pulse in an on-vehicle navigation system, said system comprising a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning,
said method processes comprising: -
a measurement process of measuring a pulse interval between the vehicle speed pulses generated by the vehicle speed sensor, a first hold process of at least temporarily holding a pulse interval measured for the n-th time (n is a natural number) by said measurement process; and
a detection process of detecting the vehicle speed pulse drop by using such a condition that a ratio of a pulse interval measured for the (n+m)-th time (m is a natural number) with respect to the pulse interval held by said first hold process is more than a predetermined threshold value as a detection condition.
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26. A program storage device readable by a computer for tangibly embodying a program of instructions executable by the computer to perform method processes of detecting a vehicle speed pulse drop with reference to a vehicle speed pulse in an on-vehicle navigation system, said system comprising a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning,
said method processes comprising: -
a measurement process of measuring a pulse interval between the vehicle speed pulses generated by the vehicle speed sensor;
a prediction process of predicting a generation time of the vehicle speed pulse, which is generated by the vehicle speed sensor and which defines an end of the pulse interval supposed to be measured for the (n+m)-th time (n and m are both natural numbers) by said measurement process, from the pulse interval measured for the n-th time by said measurement process; and
a detection process of detecting the vehicle speed pulse drop, by using such a condition that the vehicle speed pulse is not generated by the vehicle speed pulse sensor even after it has elapsed the predicted generation time.
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27. A computer data signal embodied in a carrier wave and representing a series of instructions which cause a computer to perform method processes of detecting a vehicle speed pulse drop with reference to a vehicle speed pulse in an on-vehicle navigation system, said system comprising a radio wave positioning apparatus and a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning,
said method processes comprising: -
a first calculation process of calculating a first physical quantity of a predetermined type from radio wave positioning data of the radio wave positioning apparatus;
a second calculation process of calculating a second physical quantity of the predetermined type from the vehicle speed pulse; and
a detection process of detecting the vehicle speed pulse drop by using a contradiction caused between the calculated first physical quantity and the calculated second physical quantity as a detection condition.
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28. A computer data signal embodied in a carrier wave and representing a series of instructions which cause a computer to perform method processes for detecting a vehicle speed pulse drop with reference to a vehicle speed pulse in an on-vehicle navigation system, said system comprising a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning,
said method processes comprising: -
a measurement process of measuring a pulse interval between the vehicle speed pulses generated by the vehicle speed sensor, a first hold process of at least temporarily holding a pulse interval measured for the n-th time (n is a natural number) by said measurement process; and
a detection process of detecting the vehicle speed pulse drop by using such a condition that a ratio of a pulse interval measured for the (n+m)-th time (m is a natural number) with respect to the pulse interval held by said first hold process is more than a predetermined threshold value as a detection condition.
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29. A computer data signal embodied in a carrier wave and representing a series of instructions which cause a computer to perform method processes for detecting a vehicle speed pulse drop with reference to a vehicle speed pulse in an on-vehicle navigation system, said system comprising a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning,
said method processes comprising: -
a measurement process of measuring a pulse interval between the vehicle speed pulses generated by the vehicle speed sensor;
a predicting process of predicting a generation time of the vehicle speed pulse, which is generated by the vehicle speed sensor and which defines an end of the pulse interval supposed to be measured for the (n+m)-th time (n and m are both natural numbers) by said measurement process, from the pulse interval measured for the n-th time by said measurement process; and
a detection process of detecting the vehicle speed pulse drop, by using such a condition that the vehicle speed pulse is not generated by the vehicle speed pulse sensor even after it has elapsed the predicted generation time.
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Specification