Pose estimation using long range features
First Claim
1. A method comprising:
- receiving data collected by a first sensor while a vehicle is driving on a roadway, the first sensor having a first sensor range;
using the received data from the first sensor to generate a map of the vehicle'"'"'s environment within the first sensor range;
estimating, by a processor, the vehicle'"'"'s geographic location and heading by comparing the generated map to a stored map identifying the geographic locations of objects including reference objects having particular retroreflective, brightness, or intensity characteristics;
receiving data collected by a second sensor while the vehicle is driving on the roadway, the second sensor having a second sensor range greater than the first sensor range;
identifying a reference object having a particular retroreflective, brightness, or intensity characteristic from the data collected by the second sensor outside of the first sensor range;
correlating the identified reference object to a reference object of the stored map based on the particular retroreflective, brightness, or intensity characteristic; and
using the correlation to refine the estimated heading of the vehicle.
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Accused Products
Abstract
Aspects of the present disclosure relate to using an object detected at long range to increase the accuracy of a location and heading estimate based on near range information. For example, an autonomous vehicle may use data points collected from a sensor such as a laser to generate an environmental map of environmental features. The environmental map is then compared to pre-stored map data to determine the vehicle'"'"'s geographic location and heading. A second sensor, such as a laser or camera, having a longer range than the first sensor may detect an object outside of the range and field of view of the first sensor. For example, the object may have retroreflective properties which make it identifiable in a camera image or from laser data points. The location of the object is then compared to the pre-stored map data and used to refine the vehicle'"'"'s estimated location and heading.
28 Citations
20 Claims
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1. A method comprising:
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receiving data collected by a first sensor while a vehicle is driving on a roadway, the first sensor having a first sensor range; using the received data from the first sensor to generate a map of the vehicle'"'"'s environment within the first sensor range; estimating, by a processor, the vehicle'"'"'s geographic location and heading by comparing the generated map to a stored map identifying the geographic locations of objects including reference objects having particular retroreflective, brightness, or intensity characteristics; receiving data collected by a second sensor while the vehicle is driving on the roadway, the second sensor having a second sensor range greater than the first sensor range; identifying a reference object having a particular retroreflective, brightness, or intensity characteristic from the data collected by the second sensor outside of the first sensor range; correlating the identified reference object to a reference object of the stored map based on the particular retroreflective, brightness, or intensity characteristic; and using the correlation to refine the estimated heading of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method comprising:
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generating, by one or more processors, a map of an environment of a vehicle using a first data set collected from within a sensor range; estimating, by the one or more processors, a heading of the vehicle relative to objects in the generated map, each object having a geographic location correlated to a known geographic location of a first data reference object in a stored map, the stored map identifying known geographic locations and particular retroreflective, brightness, or intensity characteristics of a plurality of reference objects; identifying, by the one or more processors, a second data reference object having a particular retroreflective, brightness, or intensity characteristic from a second data set collected from outside of the sensor range; determining, by the one or more processors, a geographic location of the identified second data reference object by correlating the identified second data reference object to a reference object of the stored map based on the particular retroreflective, brightness, or intensity characteristic, the reference object of the stored map having a known geographic location; and updating, by the one or more processors, the estimated heading of the vehicle using the geographic location of the identified second data reference. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 20)
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16. A system comprising:
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one or more sensors configured to collect data while a vehicle is driving on a roadway; a memory storing a map identifying geographic locations and particular retroreflective, brightness, or intensity characteristics of a plurality of reference objects; and one or more processors configured to; generate a map of an environment of a vehicle using a first data set collected from within a sensor range; estimate a heading of the vehicle relative to objects in the generated map, each object having a geographic location correlated to a known geographic location of a first data reference object in the stored map; identify one or more second data reference objects from a second data set collected from outside of the sensor range, each second data reference object having a particular retroreflective, brightness, or intensity characteristic; determine a geographic location of at least one identified second data reference object by correlating each at least one second data reference object with a reference object of the stored map based on the particular retroreflective, brightness, or intensity characteristic, the reference object of the stored map having a known geographic location; and update the estimated heading of the vehicle using the geographic location of each at least one identified second data reference. - View Dependent Claims (17, 18, 19)
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Specification