Distance estimation device, distance estimation method and program

Patent metadata

Field	Value
Publication number	US-11061129-B2
Application number	US-201516065916-A
Country	US
Kind code	B2
Filing date	Dec 25, 2015
Priority date	Dec 25, 2015
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

The distance estimation device acquires distances from a movable body at a first time and a second time to two ground objects, respectively, and acquires a distance between the two ground objects. Then, the distance estimation device calculates a moving distance of the movable body from the first time to the second time based on the acquired results. Thus, the distance estimation device calculates the moving distance of the movable body using arbitrary ground objects measurable from the movable body.

First claim

The invention claimed is:

1. A distance estimation device comprising:
a device configured to detect at least three ground objects; an acquiring unit configured to acquire a first distance group and a second distance group including distances from a movable body at a first time and a second time to the at least three ground objects and a third distance group including distances between the at least three ground objects; and
a calculating unit configured to calculate a moving distance of the movable body from the first time to the second time based on the distances from the movable body to the ground objects and the distances between the ground objects, wherein the moving distance of the movable body is calculated with respect to two ground objects that are specified based on the distances from the movable body to the at least three ground objects or the distances between the at least three ground objects.

2. The distance estimation device according to claim 1 , wherein the calculating unit specifies, out of the at least three ground objects, two ground objects whose respective distances from the movable body are shorter than the distance from the moveable body to the other ground objects of the at least three ground objects.

3. The distance estimation device according to claim 1 , wherein the calculating unit excludes two ground objects, for which the distance between the ground objects is shorter than a predetermined distance, from the two ground objects to be specified by the calculating unit.

4. The distance estimation device according to claim 1 , wherein the calculating unit calculates the moving distance per one pulse of a vehicle speed pulse signal, based on the moving distance from the first time to the second time and an average pulse width of the vehicle speed pulse signal.

5. The distance estimation device according to claim 1 , wherein the calculating unit calculates the moving distance when an angular velocity in a yaw direction or a steering angle of the movable body is smaller than a predetermined threshold value.

6. The distance estimation device according to claim 1 , wherein the calculating unit acquires the distance between the two ground objects based on the distances to the two ground objects and angles formed by a traveling direction of the movable body and respective directions to the two ground objects from the moveable body.

7. The distance estimation device according to claim 1 , wherein the calculating unit acquires the distance between the two ground objects based on map information.

8. The distance estimation device according to claim 1 , wherein the calculating unit changes a time interval from the first time to the second time in accordance with a traveling speed of the movable body.

9. The distance estimation device according to claim 8 , wherein the calculating unit makes the time interval shorter as the traveling speed of the movable body becomes higher.

10. A distance estimation method executed by a distance estimation device
comprising: a process configured to detect at least three ground objects; an acquiring process configured to acquire a first distance group and a second distance group including distances from a movable body at a first time and a second time to the at least three ground objects and a third distance group including distances between the at least three ground objects; and
a calculating process configured to calculate a moving distance of the movable body from the first time to the second time based on the distances from the movable body to the ground objects and the distances between the ground objects, wherein the moving distance of the movable body is calculated with respect to two ground objects that are specified based on the distances from the movable body to the at least three ground objects or the distances between the at least three ground objects.

11. A non-transitory computer-readable medium storing a program executed by a distance estimation device comprising a computer, the program causing the computer to
function as: a device configured to detect at least three ground objects; an acquiring unit configured to acquire a first distance group and a second distance group including distances from a movable body at a first time and a second time to the at least three ground objects and a third distance group including distances between the at least three ground objects; and
a calculating unit configured to calculate a moving distance of the movable body from the First time to the second time based on the distances from the movable body to the ground objects and the distances between the ground objects, wherein the moving distance of the movable body is calculated with respect to two ground objects that are specified based on the distances from the movable body to the at least three ground objects or the distances between the at least three ground objects.

Assignees

• Pioneer Corp

Inventors

• Niihara Ryoko
• Kato Masahiro
• Kaneko Hitoshi

Classifications

• G01C22/00 Primary

  Measuring distance traversed on the ground by vehicles, persons, animals or other moving solid bodies, e.g. using odometers, using pedometers · CPC title

• G01S17/86

  Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders · CPC title

• G01S17/42

  Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S17/46) · CPC title

• G01S5/16

  using electromagnetic waves other than radio waves · CPC title

• G01S7/4808

  Evaluating distance, position or velocity data · CPC title