System and method for acquiring geographic data for forming a digital database of road geometry in a geographic region
First Claim
1. A system for acquiring data for forming a digital database of road geometry in a geographic region, the system comprising:
- a land-based vehicle for traveling on roads;
a receiver mounted in the land-based vehicle wherein the receiver, when operated during a data gathering sequence, acquires Global Position System (GPS) signals transmitted from a plurality of satellites;
a demodulator mounted in the land-based vehicle and coupled to the receiver wherein the demodulator receives differential global position system (DGPS) signals from a differential global position system when the demodulator is operated during the data gathering sequence, wherein each GPS signal is corrected by a DGPS signal to create differentially corrected GPS data; and
a memory that stores each of the corrected GPS data.
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Accused Products
Abstract
A system and method for acquiring differentially corrected GPS data for forming a digital database of road geometry in a geographic region. A vehicle having a GPS receiver and a DGPS demodulator located therein is driven on roadways in the geographic region. The GPS receiver receives standard GPS signals and the DGPS demodulator receives DGPS signals which are used to correct the standard GPS signals. The corrected GPS signals are stored where they can be processed to create a digital database. Alternately a GPS receiver is positioned at a stationary location along with a portable DGPS demodulator. A vehicle having a GPS receiver located therein is driven on roadways in the geographic region. The GPS receiver at the stationary location is continuously operated and the DGPS demodulator is operated once to receive a DGPS signal. The DGPS demodulator can then be moved to another geographic region. The GPS receiver in the vehicle is operated as the vehicle is being driven and the GPS receiver receives standard GPS signals. The standard GPS signals from the GPS receiver at the stationary location can be used to correct the standard GPS signals received by the GPS receiver in the vehicle.
110 Citations
43 Claims
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1. A system for acquiring data for forming a digital database of road geometry in a geographic region, the system comprising:
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a land-based vehicle for traveling on roads; a receiver mounted in the land-based vehicle wherein the receiver, when operated during a data gathering sequence, acquires Global Position System (GPS) signals transmitted from a plurality of satellites; a demodulator mounted in the land-based vehicle and coupled to the receiver wherein the demodulator receives differential global position system (DGPS) signals from a differential global position system when the demodulator is operated during the data gathering sequence, wherein each GPS signal is corrected by a DGPS signal to create differentially corrected GPS data; and a memory that stores each of the corrected GPS data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for acquiring data for forming a digital database of road geometry in a geographic region using a land-based vehicle equipped to receive Global Position System (GPS) signals while the vehicle is driven on roads in the geographic region, the system comprising:
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means for receiving a differential global position system (DGPS) signal located in the land-based vehicle; means for correcting the GPS signal with the DGPS signal to provide corrected geographic position data; and a storage device for continuously storing the corrected geographic position data; wherein the means for receiving a DGPS signal comprises an antenna coupled to the vehicle and a demodulator coupled to the antenna. - View Dependent Claims (15)
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16. A system for acquiring data for forming a digital database of pathway geometry in a geographic region, the system comprising:
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a vehicle for traveling along pathways in the geographic region of interest; a receiver mounted in the vehicle wherein the receiver, when operated during a data gathering sequence, acquires Global Position System (GPS) signals transmitted from a plurality of satellites; a demodulator mounted in the vehicle and coupled to the receiver wherein the demodulator receives a differential global position system (DGPS) signal from a differential global position system when the demodulator is operated during the data gathering sequence, wherein each GPS signal is corrected by a DGPS signal to generate differentially corrected GPS data; and a memory that stores each of the differentially corrected GPS data.
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17. A method for acquiring data for forming a digital database of road geometry in a geographic region, the method comprising the steps of:
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providing a GPS receiver and a DGPS demodulator coupled to the GPS receiver on-board a land-based vehicle; driving the vehicle on a road in the geographic region; operating the GPS receiver and DGPS demodulator while traversing the road in the geographic region with the vehicle; obtaining Global Position System (GPS) signals with the GPS receiver; obtaining differential global position system (DGPS) signals with the DGPS demodulator; correcting the GPS signals with the DGPS signals to provide corrected GPS data; and storing the corrected GPS data. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of acquiring data for developing a digital database of roadway geometry for roadways and intersections in a selected geographic region, comprising the steps of:
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moving a portable DGPS unit to at least one position in said selected geographic region; operating said portable DGPS unit in conjunction with at least one standard GPS unit to acquire first data indicative of a precise position of said portable DGPS unit in said selected geographic region during a first period of time; driving a mobile vehicle on roadways in said selected geographic region; during a second period of time, operating a standard GPS unit located in said mobile vehicle to obtain second data indicative of positions of said mobile vehicle on the roadways during said step of driving; using said first data to correct said second data to obtain third data indicative of precise positions of said mobile vehicle on said roadways, whereby said third data are used to develop a digital database of roadway geometry including roadways and intersections for said selected geographic region. - View Dependent Claims (30, 31, 32, 33, 34)
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35. A system for acquiring geographic data for forming a digital database of road geometry in a geographic region, the system comprising:
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a land-based vehicle for traveling on roads; a receiver mounted in the land-based vehicle wherein the receiver, when operated during a data gathering sequence, acquires Global Position System (GPS) signals transmitted from a plurality of satellites; a demodulator for receiving at least one differential global position system (DGPS) signal from a differential global position system wherein each GPS signal is corrected by the at least one DGPS signal to create differentially corrected GPS data; a memory that stores each of the corrected GPS data; and a computer for creating the digital database from the corrected GPS data. - View Dependent Claims (36, 37, 38, 39, 40, 41)
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42. A method for acquiring data for forming a digital database of road geometry in a geographic region, the method comprising the steps of:
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receiving at least one Differential Global Position (DGPS) signal with a demodulator located in a land-based vehicle; receiving a plurality of Global Position System (GPS) signals with a receiver located in the land-based vehicle while the land-based vehicle is driven on at least one road in the geographic region; generating differentially corrected GPS data by correcting the received GPS signals with the at least one DGPS signal; storing the corrected GPS data in memory; and
using the stored corrected GPS data to create the digital database. - View Dependent Claims (43)
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Specification