JP2688764B2 - Buried position determination method for buried object exploration equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a buried position determination method of a buried object exploration apparatus that searches for a buried object buried in a structure such as concrete or the ground by using a radar. It is a thing.

[Conventional technology]

Conventionally, from an antenna that moves along the surface of a structure such as concrete or the surface of the ground, radio waves are transmitted toward this structure or the ground, and the reflected waves are reflected from the internal structure or the surface of the ground. There is a buried object exploration apparatus that displays a B-scope image of a reflected wave signal reflected from a buried object on a display device after removing a reflected wave coming from the buried object and searches the buried object from the B-scope image.

FIG. 8 is a diagram showing an image example of the B scope of the conventional buried object exploration apparatus. In the figure, 101 is the abscissa axis corresponding to the moving distance when the antenna is moved along the surface of the structure or the ground, 102 is the ordinate axis corresponding to the depth, and 103 is the reflection echo from the buried object.

[Problems to be Solved by the Invention] In a B-scope image of a conventional buried object search apparatus, a reflected echo from the buried object and a plurality of reflected echoes from one buried object are displayed due to antenna characteristics. Therefore, there is a drawback that it looks as if there are multiple buried objects. In addition, since the reflected echo has a width and a thickness, it is difficult to determine the accurate position and depth.

The present invention has been made in view of the above-mentioned points, and in order to eliminate the above-mentioned drawbacks, the buried object exploration device is embedded so that the buried object can be accurately determined by detecting the peak of the level of the reflected wave signal. The present invention relates to a position determination method.

[Means for solving the problem]

In order to solve the above problems, the present invention is a buried position determination method of a buried object exploration device, from the surface of the structure or ground by receiving the reflected wave of the radio wave transmitted from the antenna toward the structure or ground by the antenna. After removing the reflected wave, the buried object exploration apparatus displaying the image of the B scope is configured to detect the first peak of the reflected wave from the buried object and display only the peak.

Further, in an embedded object exploration device that receives a reflected wave of a radio wave transmitted from an antenna toward a structure or the ground and displays an image of the B scope, a reflected echo from the embedded object on the screen of the B scope is detected. A cursor is displayed near the center, a peak of the reflected wave signal within a certain range centered on the cursor position is detected, only that peak is displayed, and the cursor is moved to the apex position of the B scope displaying the peak. Thus, the buried position of the buried object is determined.

[Action]

By configuring the buried position determination method of the buried object exploration apparatus as described above, the first peak of the reflected wave from the buried object is detected and only that peak is displayed. Therefore, as shown in FIG. Only the echo appears on the screen of the B scope, and the position of the buried object can be easily determined.

Further, a cursor is displayed near the center of the reflection echo from the embedded object on the screen of the B scope, and the peak of the reflected wave signal within a certain range centered on the cursor position is detected,
Since only the peak is displayed and the cursor is moved to the apex position of the B scope displaying the peak, the buried position of the buried object can be easily determined.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a system configuration of a buried object exploration apparatus to which the buried position determination method of the present invention is applied. The buried object exploration apparatus includes an antenna device 1, a surface treatment circuit 2, a peak detection circuit 3 and a display circuit 4. The antenna device 1 includes a transmitting antenna 1-1 that transmits radio waves toward a structure or the ground 6, a receiving antenna 1-2 that receives reflected waves, and an oscillator (not shown) for oscillating radio waves. doing.

The antenna device 1 is movable along the surface of the structure or the ground 6, transmits radio waves from the transmitting antenna 1-1 toward the structure or the ground 6, and transmits the electric wave to the surface of the structure or the ground 6. The reception antenna 1-2 of the antenna device 1 receives the reflected wave from the buried object. The surface processing circuit 2 removes the reflected wave from the surface from the received reflected wave,
Only the reflected wave from the buried object 5 is input to the peak detection circuit 3.

A method of removing the surface wave from the reflected wave received by the surface treatment circuit 2 is disclosed in Japanese Patent Application No. 63-128011 (Japanese Patent Application Laid-Open No. 1-2975).
This is carried out using the buried object exploration technology disclosed in the specification of Japanese Patent No. 82). That is, in this buried object exploration technique, the surface treatment circuit 2 includes a storage circuit and an arithmetic circuit, and the storage circuit stores a signal of only the reflection from the surface. In the arithmetic circuit, the reception antenna 1-2 is used. A signal of only the reflection from the surface stored in the memory circuit is subtracted from the input signal and output to the peak detection circuit 3. By this subtraction processing, the reflected wave received by the antenna 1-2 is received. Only the reflected waves from the surface are removed from.

The peak detection circuit 3 is composed of a waveform storage unit (not shown) and a CPU unit. The reflected wave from the buried object output from the surface treatment circuit 2 is stored in this waveform storage unit. The stored reflected wave is data sampled at regular intervals from the surface of the structure or the ground to a deep place.

This sampled data string will be described with reference to FIG. In FIG. 10, (a) is a waveform of a transmission wave, (b) is a waveform of a transmission wave actually transmitted from the transmission antenna 1-1, and (e) is received by the transmission antenna 1-2. The waveform of the reflected wave (corresponding to (a) in FIG. 2) is shown. When the transmission wave shown in (b) is transmitted from the transmission antenna 1-1 at the transmission timing (t _i , t _{i + 1} , t _{i + 2} ...) Shown in (c), the peak a and the valley shown in (e) are transmitted. The reflected waves of b and mountain c are received by the receiving antenna 1-2. This reflected wave is sampled at the sampling timings S ₁ (t _{i + iΔt} ), S _{i + 1} (t
_{i + 1 + (i + 1) Δt} ), S _{i + 2} (t
_{i + 2 + (i + 2) Δt} ) ... That is, when sampling is performed at a constant sampling interval from the surface to a deep position, as shown in (f), at sampling timings S _i , S _{i + 1} , S _{i + 2} Get the sampling value.
This sampling value is stored in the waveform storage section.

The data stored in the waveform storage section is sequentially input to the CPU section. The CPU starts peak detection processing when the reflected wave exceeds a certain level. In this peak detection process, the sample value sequentially input from the waveform storage unit is compared with the level of the sample value input next and the level of the sample value input next, and the subsequent level is higher. For example, the reflected wave input before is cut off, and the reflected wave after is cut off. The level of the remaining reflected wave and the level of the reflected wave input next are compared to leave the higher level reflected wave. When this process is sequentially performed, the level of the sample value input earlier becomes larger than the level of the sample value input later at the peak position of the sample value, and the peak value shown in FIG. (Corresponding to (b)) is obtained. This CPU detects this peak value and outputs only the peak value signal to the display circuit 4. At this time, the first peak of the reflected wave detected by the peak detection process is one point.

Here, as shown in FIG. 8, the B-scope image is a method of displaying a reflection signal immediately below the receiving antenna 1-2 according to the moving distance of the antenna device 1. Therefore, in the peak detection processing, the peak is reset and the processing is restarted each time the antenna moves at a constant interval. By repeating this processing, the B-scope image after the peak detection processing becomes the arc-shaped display shown in FIG.

FIG. 2 (a) is a waveform diagram of the reflected wave at this time and has a length of several cycles depending on the characteristics of the antenna. The peak detection circuit 3 detects the first peak of this reflected wave and inputs only the signal to the display circuit 4. FIG. 2 (b) is a waveform diagram of this peak signal. The B-scope image of this peak signal is input to the display circuit 4 and displayed.

FIG. 3 is a diagram showing a B-scope image displayed on the display circuit 4. The reflection signal from the buried object 5 is displayed as a thin arc-shaped line, and its position can be accurately determined.

In the above configuration example, the surface processing circuit 2 and the peak detection circuit 3 are configured by individual hardware circuits.
It is also possible to provide the buried object exploration apparatus with a microcomputer and perform most of the functions of these circuits by software processing of this microcomputer.

FIG. 4 is a block diagram showing a system configuration of a buried object exploration apparatus to which another buried position determination method of the present invention is applied.
The buried object exploration device includes an antenna device 1, a display circuit 4, a storage circuit 7, a cursor control circuit 8 and a peak detection circuit 3.

The antenna device 1 is movable along the surface of the structure or the ground 6, transmits radio waves from the transmitting antenna 1-1 toward the structure or the ground 6, and transmits the electric wave to the surface of the structure or the ground 6. The reception antenna 1-2 of the antenna device 1 receives the reflected wave from the buried object. The received reflected wave is displayed on the display circuit 4 and stored in the storage circuit 7. Further, in the cursor control circuit 8, the cursor position is moved by the cursor operation button to display it on the display circuit 4 and input the cursor position to the peak detection circuit 3. The peak detection circuit 3 is composed of a waveform storage unit (not shown) and a CPU unit. The reflected wave in a fixed vertical and horizontal range centered on the cursor position input from the cursor control circuit 8 is input from the storage circuit 7 and stored in the waveform storage unit. The CPU detects the peak. The CPU section inputs this peak position to the cursor control circuit 8 to display the cursor at the position of the buried object.

The details of the above processing will be described below. Receiving antenna 1
The B-scope is displayed on the display circuit 4 for the reflected wave received at -2. FIG. 5 is a diagram showing an example of this B scope display. At this time, the cursor overlaps the vertical axis and the horizontal axis and is not displayed. Next, the cursor operation button is operated to move the cursor C near the center of the reflection echo as shown in FIG. At this time, the cursor position is input to the peak detection circuit 3. By pushing the buried position detecting button (not shown), the buried position detecting process is started. In the embedded position detection processing, first, the CPU position of the peak detection circuit 3 determines the cursor position input to the peak detection circuit 3, and a reflected wave in a fixed vertical and horizontal range and an antenna in a fixed range centered on the cursor position from the storage circuit 7. The waveform storage circuit of the peak detection circuit 3 outputs a reflected wave signal obtained by extracting only a signal having a certain depth from the reflected wave signals immediately below the receiving antenna 1-2 of a plurality of lines corresponding to the moving distance of the device 1. To enter. Next, the CPU section uses the same method as that described in the peak detection method above to find the peak of each line, that is, the receiving antenna
The peak of the reflected wave for each line immediately below 2 is detected.
This peak has an arc shape as shown in FIG. The CPU part reads this arc-shaped peak position in order from the left side,
Detect the position of the vertex. Further, the position of this vertex is input to the cursor control circuit 8, and the cursor C is displayed at the position of the vertex. Thereby, the accurate position of the buried object 5 can be determined. In the above configuration example, the memory circuit 7, the cursor control circuit 8, and the peak detection circuit 3 are configured by individual hardware circuits. However, the buried object exploration apparatus is provided with a microcomputer and the software of this microcomputer is used. It is also possible to perform many functions of these circuits by means of a physical process. FIG. 7 is a flow chart showing the flow of processing for determining the embedding position with this microcomputer.

First, the transmitting antenna 1-1 of the antenna device 1 transmits toward the structure or the ground 6, the reflected wave is received by the receiving antenna 1-2, and is stored in the memory circuit 7 (step 11).
0). Next, the cursor C is set near the center of the reflection echo 103 (step 111), and then the peak of the reflected wave signal in a certain range centered on the position of the cursor is detected (step 112). Then, the cursor position is moved to the peak position (step 113), and then the cursor position is displayed on the screen of the display circuit 4 (step 114). The position of the cursor indicates the position of the embedded object 5, that is, the distance and the depth.

〔The invention's effect〕

As described above, according to the present invention, the following excellent effects can be obtained.

A cursor is displayed in the vicinity of the center of the reflection echo from the screen-shaped embedded object of the B scope, the peak of the reflected wave signal within a certain range centering on the cursor position is detected, and only that peak is displayed, and the peak is displayed. Since the cursor is moved to the apex position of the B scope where is displayed, a point in the reflection echo having a width and a thickness can be designated, so that the position buried in the structure or the ground can be accurately determined.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the system configuration of an embedded object exploration apparatus to which the embedded position determination method of the present invention is applied, and FIG. 2 (a).
Is a reflection waveform diagram, FIG. 2 (b) is a diagram showing a peak signal, and FIG. 3 is a diagram showing a B-scope image displayed on the display circuit.
FIG. 4 is a block diagram showing a system configuration of a buried object exploration apparatus to which another buried position judging method of the present invention is applied, FIGS. 5 and 6 are views showing images of the B scope, and FIG. 7 is a buried structure. FIG. 8 is a flowchart showing the flow of position determination processing, FIG. 8 is a view showing a B-scope image of a conventional buried object exploration apparatus, and FIG.
The figure shows an image of the B scope of the peak value, and FIG. 10 is a diagram showing an example of sampling data. In the figure, 1 ... Antenna device, 2 ... Surface treatment circuit, 3 ...
… Peak detection circuit, 4 …… Display circuit, 5 …… Buried object, 6
...... Structure or ground, 7 ... Memory circuit, 8 ... Cursor control circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Yamada 5-1-1, Shimorenjaku, Mitaka-shi, Tokyo Nihon Radio Co., Ltd. (72) Inventor Atsushi Kaneda 5-1-1, Shimorenjaku, Mitaka-shi, Tokyo Within this radio Co., Ltd. (72) Inventor Teruhisa Yasuoka 5-1-1 Shimorenjaku, Mitaka City, Tokyo Inside Nihon Radio Co., Ltd. (56) Reference JP 62-220888 (JP, A) JP 60- 207085 (JP, A)

Claims (1)

(57) [Claims] 1. A buried object exploration apparatus for displaying a B-scope image by receiving a reflected wave of a radio wave transmitted from an antenna to a structure or the ground, wherein the buried object on the screen of the B-scope is A cursor is displayed in the vicinity of the center of the reflection echo, the peak of the reflected wave signal within a certain range around the cursor position is detected, only that peak is displayed, and the peak is displayed at the apex position of the B scope. An embedded position determination method for an embedded object exploration device, characterized in that the embedded position is determined by moving the cursor.