JPH112524A - Incorrect measurement preventing method and device for measuring measurement station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent incorrect measurement in the case where the center of gravity has been moved due to eclipse of a light signal, or even in the case where a reflected image exists by detecting a light signal by photo-detectors in plural areas divided corresponding to the divided areas of a light emitting part, and comparing the obtained detection signals to determine the movement of center of gravity of the light emitting part. SOLUTION: In a comparison operating circuit in an operation control circuit 24, a shifting amount detecting circuit 27 takes the output of photo detecting elements 23A-23D as Va-Vd, and obtains the vertical shifting amount from the operation of (Va+Vb)-(Vc+Vd) and the lateral shifting amount from the operation of (Va+Vd)-(Vb+Vc). A difference detecting circuit 28 detects a difference signal according to subtract processing of Va-Vb, Vc-Vd, Va-Vd, and Vc-Vb to the output Va-Vd of the photo detecting elements 23A-23D. A determination circuit 29 determines a reflected image by computing the AND of all difference signals, and detects whether a difference signal exceeds a designated threshold level or not to determine the center of gravity moving state of the light emitting part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a position measurement plotting apparatus for creating a site sketch using a measuring point indicating section and a measuring head section, and a measuring head section for the measuring point indicating section by a tracking function or the like. The present invention relates to a method and an apparatus for preventing an erroneous measurement of a measurement point measurement performed in a state in which the measurement point is correctly faced.

[0002]

2. Description of the Related Art In a traffic accident handling business, a site plan is created at the time of watching a live broadcast. In recent years, a position measurement plotter has been used in order to create the site plan accurately and quickly. . This position measurement plotting apparatus can simultaneously perform measurement between related points at an accident site and creation of a sketch at the site, which has been conventionally performed using a tape measure (Japanese Patent Application Laid-Open No. H08-208,1992).
No. -12269). In this type of position measurement plotting device, a tracking function is provided so that the head of the measuring machine accurately faces the measuring point indicating unit (target) set at a measuring point at a position distant from the measuring machine. Can be

FIG. 7 shows a partial configuration of the above-mentioned tracking function. The illustrated reflecting mirror unit 1 is arranged in a measuring point indicating unit. The reflecting mirror unit 1 includes a corner cube reflecting mirror 2 that reflects measurement light output from a lightwave distance meter on a measuring head unit side at a remote position, and a plurality of light emitting elements are arranged at equal intervals on a circumference. The light output from the light emitting unit 3 is used as tracking light (captured light). On the other hand, as described above,
An optical distance meter is provided, and a light receiving unit 4 shown in the figure is arranged. As shown in FIG.
It is divided into four parts, and the tracking light is detected in each divided area.

Then, based on the detection of the tracking light,
The tracking operation of the measurement head unit is performed. That is, the amount of vertical displacement from the position where the front of the measurement head unit (the front of the lightwave distance meter) directly faces the reflecting mirror unit 1 of the measurement point indicating unit is, for example, the output of the A unit and the B unit of the light receiving unit 4. C and D from the sum of
The measurement head is moved in the elevation direction in which the subtraction value is obtained by subtracting the sum of the outputs of the sections. Further, the amount of deviation in the left-right direction is obtained from a value obtained by subtracting the added value of the B portion and the C portion from the added value of the A portion and the D portion of the light receiving unit 4, and the measuring head is moved in the turning direction in which the subtracted value becomes smaller. The part is rotated. By the operation in the raising and lowering directions, the front of the measuring head can be accurately directed to the reflecting mirror 1 of the measuring point indicating unit.

After that, the distance to the measuring point indicating section is measured by the lightwave distance meter, and the position of the measuring point is displayed on the three-dimensional coordinates based on the distance data, the data of the elevation angle and the turning angle of the measuring head section, and the like. Is required. In this manner, the drawing processing is executed by measuring the positions of a plurality of necessary measurement points and inputting road information, accident information, and the like regarding the measurement points and the like.

[0006]

However, since the tracking function of the position measuring and plotting device detects light from the light emitting section of the measuring point indicating section, it can capture a reflected image reflected by a show window, a puddle or the like. There is a problem that there is. That is, as shown in FIG. 8, when the measuring point indicating unit 4 is arranged near the show window 6 or the water pool 7, the reflected image G1 of the reflecting mirror unit 1 is reflected on the show window 6, which is a vertical reflecting surface, The reflection image G2 is reflected on the puddle 7 which is a horizontal reflection surface. Therefore, the reflection images G1,
The tracking light of the light emitting unit 2 of G2 may be detected, and in this case, the reflected images G1 and G2 are directly opposed.

In the lightwave distance meter, the measurement light is transmitted to the reflecting mirror unit 1 via the show window 6 and the puddle 7, and the reflected light from the corner cube reflecting mirror 2 is received to perform the distance measurement as usual. Will be Therefore, not only an erroneous measurement point is measured, but also an erroneous measurement of the distance itself occurs.

Further, as shown in FIG. 9A, the light emitting section 3 of the reflecting mirror section 1 may be hidden by an obstacle 8 such as a building or a tree. For example, the lower left side of the reflecting mirror unit 1 (as viewed from the front)
Considering the case where vignetting occurs, in the light receiving section 4, FIG.
As shown in the above, the position of the center of gravity of the light emitting unit 3 moves to the upper right. That is, in this state, it is determined that the measurement head unit has faced the reflecting mirror unit 1 and tracking is not performed accurately, and a measurement error similarly occurs.

The present invention has been made in view of the above problems, and an object of the present invention is to make these determinations even when the center of gravity moves due to vignetting of an optical signal or when a reflected image exists. Accordingly, it is an object of the present invention to provide a method and apparatus for preventing erroneous measurement of measurement point measurement in which erroneous measurement is prevented.

[0010]

According to a first aspect of the present invention, an optical signal output from a light emitting section of a measuring point indicating section is received by a light receiving section of a measuring head section. In the method of measuring the distance to the measurement point by directly facing the measurement head unit to the measurement point indicating unit, in the light emitting unit,
The light emitting elements at the diagonal positions when the area is divided are set as a diagonal light emitting unit, and different light signals are transmitted from different sets of the diagonal light emitting units. The light signals are received by the light-receiving elements in a plurality of areas correspondingly divided, and the detection signals obtained by each of the light-receiving elements are compared, and whether or not the comparison value exceeds a predetermined threshold level By determining
The center of gravity of the light emitting unit of the measurement point indicating unit is determined. The invention according to claim 2 is that the light signal output from the light emitting section of the measuring point indicating section is received by the light receiving section of the measuring head section, and the measuring head section is directly opposed to the measuring point indicating section to the measuring point. In the device for measuring the distance of the light emitting unit disposed in the measurement point indicating unit, the light emitting unit having a plurality of light emitting elements, and a light emitting element at a diagonal position when the light emitting unit is divided into regions as a diagonal light emitting unit A lighting circuit for transmitting different optical signals from different sets of the diagonal light emitting units as a set, and a light receiving unit for receiving the optical signals with a plurality of light receiving elements divided corresponding to the area division of the light emitting unit. And comparing the detection signals obtained by the respective light receiving elements, and determining whether or not the comparison value exceeds a predetermined threshold level, and determining the center of gravity shift of the light emitting unit of the measurement point indicating unit. At the same time, the measurement point indicator A comparison operation circuit for performing a reflection image determination of the light emitting portion, characterized in that the provided.

According to the above arrangement, for example, two sets of diagonal light emitting parts when the light emitting part is divided into four parts transmit optical signals of different pulses, and the light receiving part divides the light signal into four parts. , And the detection signals obtained by the four light receiving elements are compared. In this comparison processing, for example, the detection signal is subtracted between the right and left light receiving elements and between the upper and lower light receiving elements, and the state of the four difference signals is checked, whereby the position of the light emitting unit is inverted at the upper and lower sides or at the left and right sides. It is determined whether it is not.

Further, in the above-described comparison processing, it is determined whether or not the four difference signals subjected to the subtraction processing between the left and right and upper and lower light receiving elements exceed a predetermined threshold level. The center of gravity of the section is determined. That is, when the optical signal is vignetted by an obstacle, the difference signal varies (is not constant).
Therefore, the state of movement of the center of gravity can be determined by determining the variation state.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show a method and an apparatus for preventing erroneous measurement of a measuring point as an example of an embodiment. First, FIG. I do. A measuring point indicating unit 10 set at a measuring point such as a road is composed of an indicating rod 11 and a reflecting mirror unit 12, and the measuring light output from a measuring device-side lightwave distance meter described later is applied to the reflecting mirror unit 12. And a light emitting unit (LED) disposed on the outer periphery of the reflecting mirror 14 for transmitting tracking light (captured light) and a communication optical signal.
Etc.) 15 are provided. Then, a lighting circuit 16 for controlling lighting of the light emitting unit 15 is provided.

That is, as shown in FIG. 3, the light emitting section 15 has a structure in which, for example, 24 light emitting elements are arranged at equal intervals on a circumference, and the lighting control of each of these light emitting elements is performed by the lighting control. This is performed by the circuit 16. In this example, in the light emitting section 15, the circumferential area is divided into four by a vertical line and a horizontal line that coincide with the direction in which the pointing rod 11 is arranged, and the area is set to every 90 degrees. Then, as shown in the figure, when the front is viewed as A, B, C, and D from the upper left, a diagonal position A is obtained.
The lighting circuit 16 outputs different optical signals from the diagonal light emitting units (A, C) and (B, D). (FIGS. 4A and 4B).

On the other hand, on the measuring machine side, a measuring head section 20 is supported by a gantry 18 mounted on a car or the like, and the measuring head section 20 is configured to be rotatable in a raising direction and a turning direction. In the head unit 20, a TV camera 21, an optical distance meter 22, a light receiving unit 23, and a calculation control unit 24 for performing tracking control and the like are arranged. The calculation control unit 24 performs a reflection image determination and a gravity center movement determination. A comparison operation to be performed is provided. Although not shown, a monitor for displaying an image captured by the TV camera 21, a drawing operation unit (computer) for performing a process for creating a sketch based on measurement data, an operation unit for performing a measurement operation, and the like. Is provided.

The distance meter 22 outputs measurement light, receives the light reflected from the corner cube reflecting mirror 14, and measures the distance to the measurement point. As shown in FIGS. 3B to 3D, the light receiving section 23 includes light receiving elements 23A to 23D obtained by equally dividing a square into four parts by vertical lines and horizontal lines.
Is an A portion of the light emitting portion 15, 23B is a B portion of the light emitting portion 15,
23C receives the optical signal from the C section and 23D receives the optical signal from the D section.

In FIG. 1, the four light receiving elements 23A to 23D serve as a comparison operation circuit in the operation control unit 24.
Are connected to operational amplifier circuits 26A to 26D. A shift amount detecting circuit 27, a difference detecting circuit 28, and a determining circuit 29 for determining the reflection image and the movement of the center of gravity are provided downstream of the operational amplifier circuit 26. In the shift amount detection circuit 27, if the outputs of the light receiving elements 23A, 23B, 23C, and 23D are Va, Vb, Vc, and Vd, (Va + Vb)
By the calculation of-(Vc + Vd), the amount of deviation in the vertical direction (the amount of deviation from the directly-facing position), that is, the difference between the upper half received light amount and the lower half received light amount is obtained. On the other hand, (Va + Vd)-(V
b + Vc), the amount of shift in the left-right direction, that is, the difference between the left half received light amount and the right half received light amount is obtained. And
Up / down (elevation) rotation control and left / right (turning) rotation control are performed based on these difference values, and the measurement head unit 20 is driven to rotate in a rotation direction determined by positive or negative.

In the difference detection circuit 28, the output Va-Vd of the light receiving elements 23A-23D is applied to the Va-Vd.
Difference signals obtained by subtraction processing of Vb, Vc-Vd, Va-Vd, and Vc-Vb are detected. Then, the determination circuit 29 determines the reflection image by calculating the logical product (AND condition) of all the difference signals. In other words, if the light emitting unit 15 is not the reflection image but the normal light emitting unit 15, the difference signal is all at a predetermined level. Therefore, the result of the logical product is 1, but if the image is a reflection image, the difference signal is all 0. Therefore, the result of the logical product is 0
Becomes

Further, for these difference signals, it is detected whether or not the difference signal exceeds a predetermined threshold level, and the result of the detection is ANDed to determine the state of movement of the center of gravity. That is, as in the case described above, in the case of the regular light emitting unit 15, since the difference signal exceeds the threshold level, the result of the logical product is 1, but when the center of gravity is shifted, the difference signal An imbalance occurs between them, and there is a signal that does not exceed the threshold level, and the result of the logical product becomes zero.

The embodiment has the above configuration, and its operation will be described with reference to FIGS. In the measurement point indicating unit 10 of FIG.
A pulse signal (optical signal) shown in FIG. 4A is output from the diagonal light-emitting units A and C of FIG. 5, and a communication signal is included in this pulse. I have.
On the other hand, pulse signals having a constant period shown in FIG. 4B are output from the other pair of diagonal light emitting units B and D. This optical signal is normally captured by the light receiving unit 23 of the measurement head unit 20 in the state of FIG. That is, FIG.
As shown in (A), the optical signals output from the A and C portions of the light emitting section 15 are represented by black circles (the signal in FIG. 4A), and the others are represented by white circles (the signal in FIG. 4B). And, if normal, the corresponding light receiving element 23A as shown in FIG.
-23D.

Then, as described with reference to FIG. 1, based on the reception signals obtained by the four light receiving elements 23A to 23D,
The shift amount detection circuit 27 detects the shift amount in the vertical direction or the horizontal direction from the position where the measurement head unit 20 faces the reflecting mirror unit 12. That is, as described above, (Va + V
b) By the calculation of-(Vc + Vd), the amount of deviation in the up and down direction is detected.
If the value is positive, the head is driven downward, and the measurement head unit 20 is moved so that this value becomes zero. On the other hand, (Va + Vd)
By the calculation of-(Vb + Vc), the amount of deviation in the left-right direction is detected. For example, when the calculated value is positive, the vehicle turns to the right, and when the calculated value is negative, the vehicle turns to the left. By such a tracking operation, the measuring head unit 20 accurately faces the reflecting mirror unit 12.

Next, the difference detection circuit 28 and the determination circuit 29 in FIG. 1 detect the reflection image and the state of movement of the center of gravity.
That is, as described above, in this difference detection circuit 28, Va−
The subtraction processing of Vb, Vc-Vd, Va-Vd, and Vc-Vb is performed. All of the subtraction processing is to subtract the signal of FIG. 4B from the signal of FIG. When capturing the part 15, the difference signal is as shown in FIG.
(F), all signals are the same. Therefore, when a logical product (AND) is calculated by the determination circuit 29,
The output becomes 1, confirming that it is in a normal state.

On the other hand, when the reflected image of the light emitting section 15 is captured, as shown in FIG.
(A) The signal is received by the B section and the D section of the light receiving element 23,
Since the signals of the white circles in FIG. 4B are received by the A and C portions of the light receiving element 23, the difference signals are represented by FIGS. 4G to 4J.
As shown in FIG. Here, the negative component is not output. Therefore, when the logical product is calculated by the determination circuit 29, the output becomes 0, and it is determined that the vehicle is tracking the reflected image. In this case, the tracking is performed again.

In the determination of the movement of the center of gravity, FIG.
As shown in (F), the output signal of the difference detection circuit 28 is used, and it is determined whether or not the difference signal exceeds a predetermined threshold level Ls.
FIG. 5 shows a detection state in a normal state. Similar to the case of FIG. 4, difference signals of the same level are obtained, and these signals all exceed the threshold level Ls. Therefore, when the logical product (AND) is calculated by the determination circuit 29, the output becomes 1, confirming that the circuit is in a normal state.

On the other hand, for example, FIG.
When the lower left side of the light emitting unit 15 is vignetted, as shown in FIG. 3, the light receiving image moves to the upper right in the light receiving unit 23 as shown in FIG. finish. In this case, each light receiving element 23A
23D, the signal of the black circle [the signal of FIG. 4A] and the signal of the white circle [the signal of FIG.
As shown in FIGS. 6A to 6D, the received signal is a signal having a level variation.

For this reason, Va-V of the difference detection circuit 28 is used.
The results of the subtraction processing of b, Vc-Vd, Va-Vd, and Vc-Vb also have variations as shown in FIGS. 6 (E) to 6 (H), and in this example, the reason for exceeding the threshold level Ls is as follows. , (E) and (H). Therefore, when the logical product is calculated by the determination circuit 29, the output becomes 0, and it is determined that the center of gravity of the light emitting unit 15 is moving. When the state of movement of the center of gravity is determined, this state is notified by a display on the measurement display unit or a warning buzzer.

[0027]

As described above, according to the present invention,
The light emitting unit of the measurement point indicating unit transmits different optical signals from, for example, two pairs of diagonal light emitting units in the dividing unit, and the light receiving unit of the measuring head unit receives the optical signal by, for example, a quadrant light receiving element. By comparing these detection signals and determining whether or not the comparison value exceeds a predetermined threshold level, it is determined whether or not the center of gravity of the light emitting unit is shifted. Vignetting can be grasped, and erroneous measurement due to this can be prevented.

In addition, in the above-mentioned comparison operation processing, the reflection image judgment of the light emitting section is performed based on the detection signal from the four-division light receiving element, together with the detection of the above-mentioned movement of the center of gravity. Can be prevented from being measured.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a device for preventing erroneous measurement of measurement point measurement according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a schematic configuration of a position measurement plotting apparatus to which the apparatus according to the embodiment is applied.

FIG. 3 is a diagram illustrating a configuration of a measurement point indicating unit and a light receiving state of a light receiving unit of a measurement head unit according to the embodiment.

FIG. 4 is a waveform chart showing an operation when a reflected image is determined in the embodiment.

FIG. 5 is a waveform diagram showing an operation when determining the movement of the center of gravity in the embodiment and when there is no movement of the center of gravity.

FIG. 6 is a waveform chart showing an operation when determining the movement of the center of gravity in the embodiment, and when there is a movement of the center of gravity.

FIG. 7 is an explanatory diagram showing a configuration of a tracking function in the related art.

FIG. 8 is a diagram showing a state of a measurement point indicating unit measurement during a tracking operation.

FIG. 9 is a diagram illustrating a conventional state in which a measurement point indicating unit is vignetted by an obstacle [FIG. 9A] and a light receiving state obtained by a light receiving unit of a measurement head unit in this state.

[Explanation of symbols]

 10, 5 ... measurement point indicating unit, 12, 1 ... reflecting mirror unit, 15, 3 ... light emitting unit, 16 ... lighting circuit, 22 ... light wave distance meter, 23 (A, B, C, D), 4 ... light receiving unit , 24 ... arithmetic control circuit, 27 ... shift amount detection circuit, 28 ... difference detection circuit, 29 ... judgment circuit.

Claims (2)

[Claims] An optical signal output from a light emitting section of a measuring point indicating section is received by a light receiving section of a measuring head section, and the measuring head section is directly opposed to the measuring point indicating section to determine a distance to a measuring point. In the measuring method, in the light emitting unit, light emitting elements at diagonal positions when the area is divided are set as a diagonal light emitting unit, and different light signals are transmitted from different sets of the diagonal light emitting units. In the unit, the light signal is received by a plurality of light receiving elements divided corresponding to the divided area of the light emitting unit, the detection signals obtained by each of the light receiving elements are compared, and the comparison value is A method for preventing erroneous measurement of measurement point measurement, comprising determining whether or not the center of gravity of the light emitting unit of the measurement point indicating unit is determined by determining whether or not a predetermined threshold level is exceeded. 2. An optical signal output from a light emitting section of a measuring point indicating section is received by a light receiving section of a measuring head section, and the measuring head section is directly opposed to the measuring point indicating section to determine a distance to a measuring point. In the measurement device, a light emitting unit disposed on the measurement point indicating unit and including a plurality of light emitting elements, and a light emitting element at a diagonal position when the light emitting unit is divided into regions is set as a diagonal light emitting unit. A lighting circuit for transmitting a different optical signal from a different set of the diagonal light emitting units; a light receiving unit for receiving the optical signal with a plurality of light receiving elements divided corresponding to the area division of the light emitting unit; The detection signals obtained by each of the light receiving elements are compared, and whether or not the comparison value exceeds a predetermined threshold level is determined. , The light emission of the measurement point indicator Erroneous measurement prevention device of the measuring point measured, characterized and comparison operation circuit for performing a reflection image determination, that was provided for.