WO1992009903A1

WO1992009903A1 - Stc apparatus for underground buried matter probing equipment

Info

Publication number: WO1992009903A1
Application number: PCT/JP1991/001604
Authority: WO
Inventors: Yasuhiko Ichimura; Kazuaki Date
Original assignee: Kabushiki Kaisha Komatsu Seisakusho
Priority date: 1990-11-22
Filing date: 1991-11-21
Publication date: 1992-06-11
Also published as: JPH04190181A

Abstract

An STC apparatus which is used for a receiver of underground matter probing equipment for receiving the reflected waves, from an underground buried matter, of electromagnetic pulses radiated towards and into the ground and for measuring the position of the underground buried matter, and which variably sets the reception sensitivity of the receiver in accordance with a reception distance using STC signals, and STC signal variable setting means for variably setting the STC signals. The present invention makes it possible to variably and arbitrarily set STC curve characteristics.

Description

- - Specification

S T C device for underground object exploration equipment

Technical field

This kishi is an electromagnetic radar system that measures the position and depth by measuring radio waves from the ground and receiving echoes from buried objects such as gas pipes and water pipes buried underground. Regarding the inside buried object detection equipment, especially the sensitivity of the electromagnetic pulse receiver is improved! It relates to an STC device that performs control to raise gradually immediately after measurement.

Background technology

An electromagnetic pulse is emitted from the transmitter mounted on the mobile vehicle to the ground, and Rt waves from the underground objects such as gas pipes and water pipes are received by the receiver mounted on the mobile vehicle. The underground object exploration device ^s ' has already been proposed to measure the position and depth of the underground object from the image data of the underground.

In this underground exploration, radio waves are significantly attenuated as they propagate through the ground, and the problem is that the intensity of anti-needle waves from deep places is weaker than those from shallow places. For this reason, the receiver is equipped with an STC device (sennsitive time control) that performs control to gradually increase the receiver sensitivity immediately after ¾c of the electromagnetic pulse.

FIG. 7 shows a typical STC curve output from the STC device. The receiver sensitivity of the receiver is gradually increased by inputting the gain control signal having such an STC force into the variable amplifier of the receiver.

Incidentally, in the underground exploration in recent urban, dug many places and not soil force ⁵ 'uniform, many places forces ^s of soil water ^ chromatic index is different, this since each probe in the STC curve Optimum characteristics according to the place are required. However, in the conventional STC equipment, the STC curve corresponds to the homogenous soil, and the force ^s —type is fixed only. Therefore, the operator cannot arbitrarily set the optimal characteristics according to each exploration site. There was a problem.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide an underground buried object exploration device STC device capable of arbitrarily variably setting STC force-sensitive characteristics. Disclosure of the invention

In the present invention, the present invention is used for a receiver of an underground object exploration device that receives an パルス f wave of an electromagnetic pulse directed toward the ground from an underground object and measures the position of the underground object,

The receiving sensitivity of the receiver is variably set according to the receiving distance by the STC signal.

A C apparatus and STC signal variable setting means for variably setting the STC signal.

According to this configuration, an arbitrary STC signal can be set by the s signal variable setting means.

Therefore, according to the present invention, it is possible to arbitrarily change the setting of the STC signal for controlling the reception sensitivity of the buried object or the receiver of the device, so that the reception sensitivity characteristic can be freely changed according to the soil characteristics. Therefore, it is possible to obtain the optimum receiver output according to various search locations.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing an STC controller of the embodiment of the present invention, FIG. 2 is a block diagram showing an example of an inner sound of the STC curve input device of the embodiment, and FIG. FIG. 4 is a flowchart showing the operation of the embodiment, FIG. 5 is a diagram showing a mode of changing the STC curve on the display screen, FIG. 6 is a diagram showing sampling control of the STC force bar, FIG. 7 is a diagram showing the STC curve of ».

The best form for carrying out KIKI

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

FIG. 3 shows U of the STC device 1 that performs control to improve the receiving sensitivity as the receiving distance increases. In Fig. 3, the configuration consisting of the resistor R and FETs 2 and 3 is a type attenuator that utilizes the fact that the resistance between the drain (D) and source (S) of the FET is variable depending on the gate (G) voltage. The amount of attenuation can be variably set in the range of 0 to 2 Odb, for example. The amplifier 4 at the subsequent stage receives the reception output of electromagnetic waves radiated toward the ground from the underground objects such as gas pipes and water pipes via the underground resistor R. For example, {f ^ Produce 2 Increase the side effect of Odb. That is, the type attenuator and the amplifier 4 constitute an STC device 1 having a variable gain of 0 to 2 Odb. Therefore, the gates of FETs 2 and 3 of this STC device 1 By inputting the STC signal for gain control to (G), the received wave can be variably amplified.

FIG. 1 shows an example of the configuration of an STC controller 10 for inputting an STC signal to the STC device 1, and an STC curve input device 20 for inputting an STC force set arbitrarily set by an operator. An input / output control device 21 that performs input / output control for storing the STC curve in the RAM 22, a RAM 22 that stores and holds the input STC curve, an address counter 23 that outputs an address signal to the RAM 22, and a RAM 22. The D / A converter 24 that converts the read STC curve into digital / analog (Digital / Analog) and inputs it to the STC device 1 as an STC signal, counts the address counter 23, and synchronizes each circuit. And a clock generator 25 for generating a clock ck.

The address counter 23 is reset by the reset signal RST of the input / output control device 21, performs an operation of counting the clock signal ck of the clock oscillator 25, and outputs its output to the address bus A of the RAM 22. The RAM 22 inputs and outputs data to the data bus D in accordance with the address data of the address bus A. When the write signal W is input while the clock signal ck is input, the data is written. When the read signal R is input while the clock signal ck is being read, data read is performed.

The input / output control device 21 inputs a read signal R to the RAM 22 and performs a read operation of the stored front-end STC curve when receiving a reflected wave from an underground object. When the STC curve is sent from the STC force input device 20, the operation shifts to the STC curve changing operation, that is, the writing operation to the RAM 22. In other words, during this write operation, the address counter 23 is initialized by the reset signal RST, the write signal W is input to the RAM 22, and the designated STC force is written to the RAM 22. Go.

FIG. 2 shows the configuration of the STC curve input device 20, which is composed of a display device 30, an input device 31, a control device 32, and a reference STC curve generating device 33.

When performing the STC curve setting change operation, first, the standard STC curve generator After the reference STC curve stored in 33 is displayed on the display device 30, using the input device 31 (up and down keys of the cursor key on the mouse key board), as shown in FIG. Correct the STC curve. When the correction is completed, the operator inputs a predetermined correction end key to notify the controller 32 that the correction of the STC curve has been completed (step 100 in FIG. 4). The control device 32 holds the generated STC curve and samples the STC curve at the same sampling interval as the period of the clock signal ck as shown in FIG. 6 (step in FIG. 4). 110). Then, the controller 32 transfers the STC curve thus sampled to the input / output controller 21 (Step 120 in FIG. 4). The input / output control device 21 stores the input STC curve in the RAM 22 according to the above-described control. In this way, the STC curve whose setting has been changed is read out from the RAM 22 of the STC controller 10 shown in FIG. 1 and transmitted via the D / A converter 24 during the actual reception operation. The signal is input to the STC device 1 shown in Fig. 3 and is changed according to the STC force of which the setting of the receiving sensitivity force ^s of the receiver of the underground object detection device has been changed.

Industrial applicability

INDUSTRIAL APPLICABILITY The present invention is used for a receiver of an underground buried object evacuating device that receives an electromagnetic wave that is directed toward the ground and receives an anti-I wave from an underground object to measure the position of the underground object. This is useful for the STC device of the underground object exploration device that outputs the STC signal for variably setting the receiving sensitivity of the receiver according to the receiving distance.

Claims

The scope of the claims

1. It is used for the receiver of the underground object exploration equipment that measures the position of the underground object by receiving it wave of the electromagnetic pulse radiated toward the ground from the underground object, and uses the STC signal An STC device that variably sets the receiving sensitivity of the receiver according to a receiving distance; and an STC signal variable setting unit that variably sets the STC signal.

An STC device for underground buried object exploration equipment, characterized in that it is equipped with:

2. The STC signal variable setting means includes:

STC curve input means for inputting the set STC signal,

When a predetermined STC signal is stored in advance and an STC signal is output from the STC force input means, a memory means for updating and storing the STC signal previously stored with the STC signal;

Digital / analog converting means for converting the STC signal output from the memory means into digital / analog, and outputting the digital / analog converted output as an STC signal used in the STC device;

The STC device of the underground object exploration device according to claim 1, further comprising:

3. The STC curve input means:

A reference STC curve generating means in which a reference STC curve is set and stored; an input device for correcting the reference STC curve;

Sampling means for sampling the modified S T C force at a predetermined sampling interval;

The STC device of the underground object exploration device according to claim 1, comprising: