JP2019078732A - Multifunction lidar for underwater topographic survey - Google Patents

Abstract

PROBLEM TO BE SOLVED: To survey an underwater terrain for grasping the amount of sediment and water stored in a dam, fishery survey, and maritime archeology. There was a problem that it could not be surveyed. SOLUTION: A composite LIDAR characterized by simultaneously provided with a LIDAR that scans in a horizontal direction to measure a position and a LIDAR that scans in a vertical direction to measure a water depth is the above-mentioned problem-solving means. [Selection diagram] Fig. 1

Description

The present invention relates to LIDAR.

The survey of underwater topography is necessary for grasping the amount of sedimentation and storage of dam, and also for fishery survey and marine archeology.

In patent document 1, it is possible to obtain underwater topography by acquiring a measurement position using GPS, and measuring water depth using a laser.

A method of performing distance measurement using a laser is called LIDAR.

However, there is a problem that it is difficult to obtain position information by GPS under a bridge and the like, and underwater topography can not be obtained.

So, in this invention, this problem is solved by measuring water depth, detecting a self-position fundamentally using LIDAR. Of course, GPS is also used, and while referring to the data, it does not exclude what is used for correction (e.g., claim 4).

Unexamined-Japanese-Patent No. 2017-3593

The problem to be solved by the present invention is to provide a compound LIDAR capable of accurately measuring the measurement position and the water depth even under a bridge or the like where the position information can not be obtained by GPS. is there.

The above problem can be solved by a combined LIDAR characterized by simultaneously including LIDAR which measures the position by scanning in the horizontal direction and LIDAR which measures the water depth by scanning in the vertical direction.

In the present invention, LIDAR is generally used and includes commercially available ones, but basically, it is preferable to include a laser transmitter and a laser receiver, preferably integrated and operating simultaneously May be combined independently, with means for correcting the time difference between the transmitter and the receiver.

A horizontal scan is, for example, preferably a float with a floatable substance container, such as air, integrally coupled to the main body, floating the main body of the composite LIDAR, without waves, without wind, and stable When scanning, it means scanning in all directions parallel to the water surface, but preferably means rotating and measuring 360 degrees or more (e.g., claim 5). In some cases, there is also a type (e.g., claim 2) in which the main body is floated in the air using a so-called drone-like system (for example, claim 2), which can be advantageously used when the influence of the water surface is large.

In addition, the scan in the vertical direction may be perpendicular to the plane including all the scans in the horizontal direction, and in order to facilitate the correction, the vertical direction including the water depth direction may be used regardless of the plane. It is possible.

The data for the 3D map obtained by the composite LIDAR according to the present invention can be obtained by the display device through the separately prepared display device or an image processing device having an image processing circuit for performing image correction, Accurate display of 3D maps can be easily performed. Commercially available devices can be advantageously used as the devices described above.

The present invention also includes a system for obtaining the 3D map or the printed matter using the obtained data in the invention described in each claim, and, for example, LIDAR which measures the position by scanning in the horizontal direction and A compound LIDAR simultaneously provided with LIDARs for measuring water depth by scanning in the vertical direction, wherein the floating body for floating the main body is provided on the water surface; A system for processing and displaying the processed data is also useful.

According to the present invention, the measurement position and the water depth can be simultaneously and accurately measured, and as a result, the survey of underwater topography can be performed.

FIG. 1 is an embodiment of the present invention.

Hereinafter, the present invention will be described by way of examples, but the present invention is not limited thereto.
The embodiment shown in FIG. 1 is an embodiment provided with a LIDAR 1 for performing a horizontal scan, a LIDAR 2 for performing a vertical scan, and a floating body for floating the main body on the water surface.

The LIDAR 1 rotates with its support to perform a horizontal scan to obtain two-dimensional image data while confirming the positions of the X and Y axes. LIDAR2 can measure Z-axis water depth, and it is easy to obtain 3D data overall. At this time, LIDAR 2 may be rotated with its support and synchronized with the above-mentioned horizontal scan. The effect of stabilization of the main body is obtained.

1 LIDAR for horizontal scanning
2 LIDAR for scanning vertically
3 floating body

Claims (5)

  A combined LIDAR characterized by LIDAR, which measures the position by scanning in the horizontal direction, and LIDAR, which measures the water depth by scanning in the vertical direction.   The composite LIDAR according to claim 1, further comprising a floating body for floating the main body on the water surface.   A composite LIDAR characterized by having means for floating the floating body in the air and capable of positioning the main body in space.   The composite LIDAR according to any one of claims 1 to 3, wherein the measuring device includes X axis, Y axis, and Z axis correction means, and the correction means corrects data.   The composite LIDAR according to any one of claims 1 to 4, wherein the measuring device is configured to be rotatable, and is rotated by rotation means.

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