Apparatus and method for detecting vehicle location in navigation system
First Claim
1. An apparatus for detecting a vehicle location in a navigation system, comprising:
- a GPS receiver for receiving a navigation message transmitted by a GPS satellite;
a map data storage unit for storing a digital map data therein;
a sensor unit for detecting a travel direction and a traveled distance of a vehicle and lateral and longitudinal inclinations of a road on which the vehicle travels;
a control unit for comparing the value of DOP (Dilution of Precision) of the navigation message received by the GPS receiver with a predetermined threshold, setting reference vehicle location information from vehicle location information detected using the navigation message if the value of DOP is less than the predetermined threshold, or determining the reference vehicle location information by storing vehicle location information map-matched to the digital map data when the just previous value of DOP was less than the predetermined threshold, by accumulating detection signals from the sensor unit, and by using the stored vehicle location information and the accumulated detection signals from the sensor unit if the value of DOP is equal to or greater than the predetermined threshold, estimating the vehicle location using the determined reference vehicle location information and the detection signals from the sensor unit, and map-matching the estimated vehicle location to the digital map data stored in the map data storage unit; and
a display unit for displaying the digital map data and vehicle location map-matched by the control unit on a screen thereof.
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Accused Products
Abstract
An apparatus and a method for detecting a vehicle location in a navigation system are provided. A travel angle difference and lateral and longitudinal inclinations of the vehicle are used to accurately detect the vehicle location if a vehicle location is estimated using detection signals from a sensor unit installed on a vehicle. If a value of DOP (Dilution of Positioning) of a navigation message received by a GPS (Global Positioning System) receiver is equal to or greater than a predetermined threshold, reference vehicle location information is set using vehicle location information just previously map-matched and the detection signals from the sensor unit. The vehicle location is detected using the set reference vehicle location information and the detection signals from the sensor unit.
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Citations
31 Claims
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1. An apparatus for detecting a vehicle location in a navigation system, comprising:
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a GPS receiver for receiving a navigation message transmitted by a GPS satellite; a map data storage unit for storing a digital map data therein; a sensor unit for detecting a travel direction and a traveled distance of a vehicle and lateral and longitudinal inclinations of a road on which the vehicle travels; a control unit for comparing the value of DOP (Dilution of Precision) of the navigation message received by the GPS receiver with a predetermined threshold, setting reference vehicle location information from vehicle location information detected using the navigation message if the value of DOP is less than the predetermined threshold, or determining the reference vehicle location information by storing vehicle location information map-matched to the digital map data when the just previous value of DOP was less than the predetermined threshold, by accumulating detection signals from the sensor unit, and by using the stored vehicle location information and the accumulated detection signals from the sensor unit if the value of DOP is equal to or greater than the predetermined threshold, estimating the vehicle location using the determined reference vehicle location information and the detection signals from the sensor unit, and map-matching the estimated vehicle location to the digital map data stored in the map data storage unit; and a display unit for displaying the digital map data and vehicle location map-matched by the control unit on a screen thereof. - View Dependent Claims (2, 3)
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4. A method for detecting a vehicle location in a navigation system, comprising the steps of:
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extracting, by a map-matched result extraction section, vehicle location information by receiving vehicle location information map-matched to digital map data from a map-matching section, extracting, by a location information extraction section, vehicle location information and DOP (Dilution of Precision) using a navigation message received by a GPS receiver, and extracting, by a travel information extraction section, vehicle travel information using detection signals from a sensor unit installed on a vehicle; determining the vehicle location information extracted by the location information extraction section as reference vehicle location information, or determining the reference vehicle location information by storing the vehicle location information extracted by the map-matched result extraction section, accumulating the detection signals from the sensor unit, and using the stored vehicle location information and the accumulated detection signals from the sensor unit, according to the extracted value of DOP; performing, by a dead reckoning section, dead reckoning using the vehicle travel information extracted by the travel information extraction section and the determined reference vehicle location information to extract current vehicle location information; and map-matching, by the map-matching section, the current vehicle location information extracted by the dead reckoning section to the digital map data, displaying the map-matched results on a display unit, and providing the map-matched results to the map-matched result extraction section to extract the map-matched vehicle location information. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 24, 25)
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21. A method for determining a vehicle location, comprising the steps of:
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determining a travel speed of a vehicle using the number of pulse signals per unit time generated by an odometer of a sensor unit according to travel of the vehicle; setting a traveled-distance conversion coefficient varying according to the determined travel speed of the vehicle, and calculating a traveled distance per unit time of the vehicle; and determining the vehicle location by performing dead reckoning using the calculated traveled distance per unit time. - View Dependent Claims (22, 23)
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26. A method of detecting a vehicle location in a navigation system, comprising the steps of:
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receiving, by a control unit, a travel angle difference and a traveled distance of a vehicle, and lateral and longitudinal inclinations of a road on which the vehicle travels from a sensor unit; calculating a traveled distance per unit time using the received traveled distance; correcting a travel angle of the vehicle using the received lateral and longitudinal inclinations of the road; correcting the traveled distance per unit time using the received lateral and longitudinal inclinations of the road; and detecting a current vehicle location from a previous vehicle location using the corrected travel angle and the corrected traveled distance per unit time. - View Dependent Claims (27, 28, 29)
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30. A method for detecting a vehicle location in a navigation system, comprising the steps of:
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extracting, by a control unit, an azimuth of a road on which a vehicle currently travels from a digital map data, and extracting a traveled distance per unit time of the vehicle using the number of pulse signals output from an odometer of a sensor unit according to travel of the vehicle; estimating current longitude and latitude coordinates of the vehicle using the extracted azimuth of the road, the extracted traveled distance per unit time of the vehicle, and just previously estimated longitude and latitude coordinates of the vehicle; determining a location and a road where the vehicle will be matched on the digital map using the extracted azimuth of the road and the estimated longitude and latitude coordinates of the vehicle; and matching the vehicle at the determined location and road and displaying the matched results.
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31. A method for detecting a vehicle location in a navigation system, comprising the steps of:
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acquiring, by a control unit, a current vehicle location using hybrid navigation; acquiring an inclination of a road on which a vehicle travels using detection signals from a sensor unit; searching roads within a search radius set from the acquired current vehicle location using digital map data, extracting roads on which the vehicle location will be matched, and searching attributes of the extracted roads; if it is determined from the search results of the road attributes that there is no entrance link for an overpass, the current vehicle location is matched on a road closest thereto; if it is determined from the search results of the road attributes that there is an entrance link for an overpass, comparing the acquired inclination of the road on which the vehicle currently travels with an inclination of a previous road on which the vehicle has traveled; if it is determined from the comparison that the inclination of the current road is larger than that of the previous road, matching the vehicle location on an overpass; and if it is determined from the comparison that the inclination of the current road is not larger than that of the previous road, matching the vehicle location on a closest road among roads except overpasses.
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Specification