Travel distance estimation device
First Claim
1. A travel distance estimation device comprising:
- an acceleration sensor mounted on a vehicle that detects a traveling direction acceleration of the vehicle, the traveling direction acceleration indicating an acceleration of the vehicle in an anteroposterior direction of the vehicle;
a Global Positioning System (GPS) signal receiver mounted on the vehicle that receives a GPS signal from a GPS satellite of a GPS satellite positioning system;
a controller connected to the acceleration sensor and the GPS signal receiver, mounted on the vehicle, and having a processor configured to;
determine a plurality of traveling direction accelerations over a time period, based on output from the acceleration sensor;
calculate an acceleration integrated value by integrating the plurality of traveling direction accelerations determined by the processor over the time period;
calculate a velocity initial value of the vehicle based on a Doppler shift amount of the GPS signal received by the GPS signal receiver from the GPS satellite of the GPS satellite positioning system or a velocity of the vehicle at a time of stoppage of the vehicle;
calculate an estimated velocity of the vehicle based on the acceleration integrated value calculated by the processor and the velocity initial value calculated by the processor;
calculate an estimated travel distance of the vehicle based on the estimated velocity calculated by the processor and a predetermined time;
calculate, upon calculating the velocity initial value, a plurality of corrected past velocities by correcting a plurality of past estimated velocities, the plurality of corrected past velocities being calculated as continuous with the calculated velocity initial value, the plurality of past estimated velocities being previously determined by the processor during the time period, the time period being from when a previous velocity initial value was previously determined by the processor until the velocity initial value is determined by the processor;
recalculate, upon determining the plurality of corrected past velocities by the processor, based on the plurality of corrected past velocities and the time period, an estimated travel distance during the time period; and
estimate a traveling trajectory of the vehicle based on the estimated travel distance during the time period.
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Accused Products
Abstract
A travel distance estimation device is provided. The travel distance estimation device includes an estimated velocity determination unit that successively estimates an estimated velocity of a movable object based on an acceleration integrated value and a velocity initial value a travel distance calculation unit that successively calculates an estimated travel distance of the movable object based on the estimated velocity, and a past velocity correction unit that determines corrected past velocities by correcting pre-correction past estimated velocities so that the corrected past velocities are continuous with the velocity initial value determined this time. The pre-corrected past estimated velocities are the estimated velocities that were successively determined. The travel distance estimation device further includes a travel distance correction unit that recalculates based on the corrected past velocities an estimated travel distance.
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Citations
8 Claims
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1. A travel distance estimation device comprising:
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an acceleration sensor mounted on a vehicle that detects a traveling direction acceleration of the vehicle, the traveling direction acceleration indicating an acceleration of the vehicle in an anteroposterior direction of the vehicle; a Global Positioning System (GPS) signal receiver mounted on the vehicle that receives a GPS signal from a GPS satellite of a GPS satellite positioning system; a controller connected to the acceleration sensor and the GPS signal receiver, mounted on the vehicle, and having a processor configured to; determine a plurality of traveling direction accelerations over a time period, based on output from the acceleration sensor; calculate an acceleration integrated value by integrating the plurality of traveling direction accelerations determined by the processor over the time period; calculate a velocity initial value of the vehicle based on a Doppler shift amount of the GPS signal received by the GPS signal receiver from the GPS satellite of the GPS satellite positioning system or a velocity of the vehicle at a time of stoppage of the vehicle; calculate an estimated velocity of the vehicle based on the acceleration integrated value calculated by the processor and the velocity initial value calculated by the processor; calculate an estimated travel distance of the vehicle based on the estimated velocity calculated by the processor and a predetermined time; calculate, upon calculating the velocity initial value, a plurality of corrected past velocities by correcting a plurality of past estimated velocities, the plurality of corrected past velocities being calculated as continuous with the calculated velocity initial value, the plurality of past estimated velocities being previously determined by the processor during the time period, the time period being from when a previous velocity initial value was previously determined by the processor until the velocity initial value is determined by the processor; recalculate, upon determining the plurality of corrected past velocities by the processor, based on the plurality of corrected past velocities and the time period, an estimated travel distance during the time period; and estimate a traveling trajectory of the vehicle based on the estimated travel distance during the time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification