Structure measuring device, measurement point correcting device, and measurement point correcting method

Patent metadata

Field	Value
Publication number	US-11009348-B2
Application number	US-201716622984-A
Country	US
Kind code	B2
Filing date	Jul 31, 2017
Priority date	Jul 31, 2017
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

The interior of a first measurement surface and the interior of a second measurement surface traveling together with a measuring vehicle are scanned to acquire first measurement coordinate points and second measurement coordinate points, respectively. A first comparison point cloud representing a comparison part on a surface of a structure is extracted from the first measurement coordinate points. A second comparison point cloud representing a comparison part on the surface of the structure is extracted from the second measurement coordinate points. A difference between the first comparison point cloud and the second comparison point cloud corresponding to measurement of a common comparison part on the surface of the structure is calculated. Error having time dependence included in the first measurement coordinate points and the second measurement coordinate points is calculated on the basis of the calculated difference. The measurement coordinate points are corrected on the basis of the calculated error.

First claim

The invention claimed is:

1. A structure measuring device that measures the geometry of a surface of a structure around a measuring vehicle, comprising:
a position and attitude sensor that senses the position and attitude of the measuring vehicle;
a first point cloud sensor that senses relative positions of multiple first measurement points from the measuring vehicle by scanning the interior of a first measurement surface traveling together with the measuring vehicle;
a second point cloud sensor that senses relative positions of multiple second measurement points from the measuring vehicle by scanning the interior of a second measurement surface traveling together with the measuring vehicle and differing from the first measurement surface;
a measurement coordinate point calculator that calculates multiple first measurement coordinate points forming a three-dimensional point cloud representing the multiple first measurement points on the basis of the relative positions of the multiple first measurement points sensed by the first point cloud sensor and an estimated position and attitude the measuring vehicle has at a time when each of the multiple first measurement points is sensed, and calculates multiple second measurement coordinate points forming a three-dimensional point cloud representing the multiple second measurement points on the basis of the relative positions of the multiple second measurement points sensed by the second point cloud sensor and an estimated position and attitude the measuring vehicle has at a time when each of the multiple second measurement points is sensed;
a storage that stores the multiple first measurement coordinate points and the multiple second measurement coordinate points together with respective measurement times;
a comparison part extractor that extracts a first comparison point cloud representing a comparison part on the surface of the structure from the multiple first measurement coordinate points stored in the storage, and extracts a second comparison point cloud representing a comparison part on the surface of the structure from the multiple second measurement coordinate points stored in the storage;
a difference calculator that calculates a difference between the first comparison point cloud and the second comparison point cloud corresponding to measurement of a common comparison part on the surface of the structure;
an error calculator that calculates error having time dependence included in the multiple first measurement coordinate points and the multiple second measurement coordinate points on the basis of the difference calculated by the difference calculator; and
a coordinate value corrector that corrects at least either the multiple first measurement coordinate points or the multiple second measurement coordinate points on the basis of the error calculated by the error calculator.

2. The structure measuring device according to claim 1 , wherein
a normal vector to each of the first measurement surface of the first point cloud sensor and the second measurement surface of the second point cloud sensor has a component of zero along a right-left axis of the measuring vehicle.

3. The structure measuring device according to claim 2 , wherein
the first measurement surface of the first point cloud sensor is orthogonal to a front-back axis of the measuring vehicle.

4. The structure measuring device according to claim 3 , wherein
the normal vector to the second measurement surface of the second point cloud sensor is tilted 30 degrees from the front-back axis of the measuring vehicle.

5. The structure measuring device according to claim 1 , wherein
the error calculator calculates at least height error as the error having time dependence included in the multiple first measurement coordinate points and the multiple second measurement coordinate points.

6. The structure measuring device according to claim 5 , wherein
the difference calculator calculates a difference between the height of the first comparison point cloud and the height of the second comparison point cloud.

7. The structure measuring device according to claim 1 , wherein
the error calculator calculates at least roll error as the error having time dependence included in the multiple first measurement coordinate points and the multiple second measurement coordinate points.

8. The structure measuring device according to claim 7 , wherein
the comparison part extractor calculates a tilt of an approximate straight line of the first comparison point cloud and a tilt of an approximate straight line of the second comparison point cloud.

9. The structure measuring device according to claim 1 , wherein
the error calculator calculates at least pitch error as the error having time dependence included in the multiple first measurement coordinate points and the multiple second measurement coordinate points.

10. The structure measuring device according to claim 9 , wherein
the comparison part extractor extracts a first lower comparison point cloud and a first upper comparison point cloud as the first comparison point cloud, and extracts a second lower comparison point cloud and a second upper comparison point cloud as the second comparison point cloud.

11. The structure measuring device according to claim 1 , wherein
the first measurement surface of the first point cloud sensor and the second measurement surface of the second point cloud sensor are parallel to each other.

12. The structure measuring device according to claim 11 , wherein
the comparison part extractor calculates a barycenter of a pattern drawn by the first comparison point cloud and a barycenter of a pattern drawn by the second comparison point cloud.

13. The structure measuring device according to claim 11 , wherein
the error calculator calculates at least horizontal error as the error having time dependence included in the multiple first measurement coordinate points and the multiple second measurement coordinate points.

14. A measurement point correcting device that corrects at least either multiple first measurement coordinate points or multiple second measurement coordinate points indicating the geometry of a surface of a structure acquired by scanning the interior of a first measurement surface and scanning the interior of a second measurement surface, respectively, the first measurement surface and the second measurement surface maintaining a relative positional relationship and traveling together, the measurement point correcting device comprising:
a comparison part extractor that extracts a first comparison point cloud representing a comparison part on the surface of the structure from the multiple first measurement coordinate points, and extracts a second comparison point cloud representing a comparison part on the surface of the structure from the multiple second measurement coordinate points;
a difference calculator that calculates a difference between the first comparison point cloud and the second comparison point cloud corresponding to measurement of a common comparison part on the surface of the structure;
an error calculator that calculates error having time dependence included in the multiple first measurement coordinate points and the multiple second measurement coordinate points on the basis of the difference calculated by the difference calculator; and
a coordinate value corrector that corrects at least either the multiple first measurement coordinate points or the multiple second measurement coordinate points on the basis of the error calculated by the error calculator.

15. A measurement point correcting method that

Assignees

• Mitsubishi Electric Corp

Inventors

• Kamei Katsuyuki
• Watanabe Masashi
• Fujibayashi Hiroyuki
• Irie Megumi

Classifications

• G01S17/89

  for mapping or imaging · CPC title

• G01S7/4808

  Evaluating distance, position or velocity data · CPC title

• G01B21/045

  Correction of measurements (G01B9/02055 takes precedence) · CPC title

• G01B11/303

  using photoelectric detection means · CPC title

• G01P15/02

  by making use of inertia forces {using solid seismic masses}(G01P15/14 takes precedence) · CPC title