JPH0358646B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a surveying device using a laser.

[Prior Art] As is well known, the triangulation currently being carried out requires manpower and long working hours, and measurement results vary depending on the level of skill, and the measurement points have to be moved. It was difficult to carry out measurements continuously, and furthermore, there were problems such as the inability to directly input data into a computer or the like.

Regarding surveying methods using light rays, Special Publication 1982-
Publication No. 25206 discloses a method using the three-point double angle method. However, in this known technology, 3
The light rays emitted from the reference points are mutually parallel, and
They are made to rotate at the same speed and in the same way. Therefore, there are problems in that the number of equipment used increases and that the uniform velocity of the emitted light beam greatly affects measurement accuracy.

In addition, Japanese Patent Application Laid-Open No. 117110/1983, which is a prior art referenced in the above publication, discloses that light sources are provided at two fixed positions having a predetermined distance from each other, and at a drifting buoy, and at two locations. A light receiving device whose light receiving direction rotates is provided at each fixed position, and the apex angle of each fixed position is determined by the ratio of the time for one light receiving device to detect the light source of the buoy and the light source of the other light receiving device. A technique for determining the coordinates of a drifting buoy from distance and apex angle is shown. However, with this known technique, it is necessary to increase the brightness of the light source of the drifting buoy, but this is difficult due to power supply issues, and it is said that it is impossible to use it at a distance of about 100 meters or more.

A more common distance measurement technique is to place a beam of light from a single light source rotating at a constant speed at a predetermined position.
The technology of receiving light at two light receiving sections and calculating the distance from the arrival time difference at each light receiving section was developed in Japanese Patent Application Laid-open No. 59
-Disclosed in Publication No. 162473. However, since this known technique requires three light receiving sections, all three light receiving sections must be moved when surveying a predetermined area. Not suitable for point surveying.

[Problems to be Solved] Accordingly, an object of the present invention is to provide a surveying device using a laser that can continuously measure over a wide range and that can be easily processed by a computer.

[Means for Solving the Problems] According to the surveying device using a laser according to the present invention, the vertices of a triangle including the measurement point in plan are respectively the first, second and third reference points, and the first and second points are A first and second laser lighthouse that rotates at a constant speed and emits a laser beam is installed at each reference point, and a first laser lighthouse that receives the laser beam from the second laser lighthouse is installed at the first reference point. A laser receiver is provided at the second reference point, and a second laser receiver is provided at the second reference point to receive the laser light from the first laser lighthouse. A third laser receiver is provided to receive the laser light from the laser lighthouse,
Find the time difference between the laser beams reaching the second laser receiver and the third receiver while the laser beam from the first laser lighthouse is rotating; Find the time difference between when the laser beam reaches the third laser receiver and the first laser receiver, calculate the apex angles of the first and second reference points from these time differences, and calculate the apex angles and the second reference point. An arithmetic device is provided for calculating the coordinates of the third reference point from the distance between the first and second reference points.

[Preferred Embodiment] When carrying out the present invention, the apex angle of one reference point is determined from the 100 percent of the circumference of the time difference between the laser beam of one reference point reaching the measurement point from the other reference point,
It is preferable to find the apex angle of the other reference point in the same way, and then use trigonometry to find the coordinates of the measurement point from the distance between the two reference points and these apex angles.

[Description of effects] The distance l between the two laser lighthouses is measured in advance, and the above-mentioned time difference is proportional to the rotational speed of each laser lighthouse, so the first and second standards can be determined from the rotational speed of the laser lighthouse. The apex angles θ and ψ of the point can be found. Then, the coordinates of the third reference point can be easily determined by trigonometry from the distance l and the apex angles θ and ψ.

In this way, the coordinates of the measurement point are determined by a calculation device based on the time difference between when the laser beam reaches each receiver, so there is no need for manpower, labor is saved, speed is increased, and measurement results can vary from person to person. There is no
In addition, continuous measurement can be performed by moving measurement points, and furthermore, a microcomputer can be used as the arithmetic device, and data input, recording, etc. can be facilitated.

In addition, since there are two reference points, the number of equipment used is small, and highly accurate surveying is possible without being affected by the difference in rotational speed between the two light sources.Furthermore, since there is no light source at the measurement point, , when used to measure drifting buoys, it is possible to increase the limit of the measurement distance.

[Examples] Examples of the present invention will be described below with reference to the drawings.

In Fig. 1, vertices A and B of triangle CAB, which includes measurement point C in the plan view, are located at reference points A and B, respectively.
B is provided.

At the reference point A, a laser lighthouse 1 and a laser receiver 3 that emit a rotating laser beam are installed.
At the reference point B, a laser lighthouse 2 and a laser receiver 4 are installed, and at the measurement point, a laser receiver 5,
6 is provided.

In Figure 2, the laser lighthouse and laser receiver are installed on three legs at each point, and the laser lighthouse 1 and receivers 5 and 4 and the laser lighthouse 2 and laser receivers 3 and 6 are located in the same horizontal plane, respectively. is positioned. Each of the light receivers 3, 4, 5, and 6 is connected to an arithmetic unit 10, respectively.
In the illustrated example, each laser lighthouse is designed to rotate clockwise.

In FIG. 3, the arithmetic unit 10 is composed of a microcomputer, and has a time difference measurement function 11a that inputs the signals of the light receivers 4 and 5, a time difference measurement function 11b that inputs the signals of the light receivers 3 and 6, and a time difference measurement function 11b that inputs the signals of the light receivers 3 and 6. Angle calculation functions 12a and 12b that calculate the apex angle of each reference point from the measurement results of 11a and 11b;
A reference distance input function 13 for inputting a distance between reference points, that is, a reference distance, and an angle calculation function 12a, 12
A coordinate calculation function 14 that calculates the coordinates of the measurement point C based on the signals from the reference distance input function 13 and the reference distance input function 13, and a display function 15 that displays and stores the calculation results of the coordinate calculation function 14 are provided.

Next, the mode of surveying will be explained with reference to the flowchart shown in FIG. 4 and FIG. 1.

First, a reference distance l is measured by means not shown, and the coordinate calculation function 1 is sent from the reference distance input function 13.
4 (step S1). Next, the time difference tbc between when the rotating laser beam of the laser lighthouse 1 reaches the light receiver 4 and when it reaches the light receiver 5, and further,
The time difference tcb from when the laser beam rotates and reaches the optical receiver 5 to when it reaches the optical receiver 4 is expressed as the optical receiver 4,
Based on the signal from the laser lighthouse, the time difference measurement function 11a measures the signal and inputs it to the angle calculation section 12a. Receiver 6
The time difference between reaching the photoreceiver 3 and reaching the photoreceiver 3
tca is measured by the time difference measurement function 11b based on the signals from the light receivers 3 and 6, and input to the angle calculation section 12b (step S2). Next, angle calculation function 1
2a calculates the apex angle θ of the reference point A based on the measurement result of the time difference measurement function 11a using the following formula: θ={tbc/(tbc+tcb)}×360°, and the angle calculation function 12b calculates the apex angle θ of the reference point A based on the measurement result of the time difference measurement function 11b. Based on the results, the apex angle ψ of the reference point B is calculated using the following formula: ψ={tca/(tac+tca)}×360° (step S3). Next, the coordinate calculation function 14 calculates the coordinates of the measurement point C by trigonometry based on the reference distance l and the apex angles θ and ψ (step S4), and displays them on the display function 15 (step S5).

[Effects of the Invention] Since the present invention is configured as described above, it produces the effects described below.

(a) Labor-saving and speed-up can be achieved without the need for manpower.

(b) There are no individual differences in measurement results, and measurements can be taken continuously by moving measurement points.

(c) Can be input directly into a computer, etc.

(d) The number of equipment used can be minimized.

(e) Regardless of the constant rotation speed of both laser beams,
Accurate measurements can be made.

(f) When carried out for surveying drifting buoys, the limit of measurement distance can be increased.

(g) When surveying numerical points over a wide area, it is only necessary to move the laser receiver at the third reference point, making the work easy.

[Brief explanation of drawings]

1 and 2 are hardware configuration diagrams for implementing the present invention, FIG. 3 is a functional block diagram of an arithmetic unit, and FIG. 4 is a flowchart showing one embodiment of the present invention. A, B...Reference point, C...Measurement point, l...Reference distance, tbc, tcb, tac, tca...Time difference, θ, ψ
... Vertical angle of reference point, 1, 2 ... Laser lighthouse,
3, 4, 5, 6... Laser receiver, 10... Arithmetic device.

Claims (1)

[Claims] 1 The vertices of the triangle that includes the measurement point in plan are the first, second and third reference points, respectively, and the first and second reference points are respectively rotated at a constant speed and irradiated with laser beams. A second laser lighthouse is installed, and the first reference point is provided with a first laser receiver that receives the laser light from the second laser lighthouse, and the second reference point is provided with a first laser receiver that receives the laser light from the first laser lighthouse. A second laser receiver is provided to receive the laser light from the first and second laser lighthouses, and a third laser receiver is provided at the third reference point which is the measurement point to receive the laser light from the first and second laser lighthouses.
Find the time difference between the laser beams reaching the second laser receiver and the third receiver while the laser beam from the first laser lighthouse is rotating; Find the time difference between when the laser beam reaches the third laser receiver and the first laser receiver, calculate the apex angles of the first and second reference points from these time differences, and calculate the apex angles and the second reference point. A measuring device using a laser, characterized in that it is provided with an arithmetic device that calculates the coordinates of a third reference point from the distance between the first and second reference points.