KR100594625B1 - Seismic wave detection system - Google Patents

Abstract

The seismic wave detection system of the present invention reduces the error of the microdivision to reduce the magnitude of the section width by the time window between the amplitudes and to differentiate the analog signal measured by the seismic wave change rate measuring unit, even in the case of an observation station having a normal noise. Through the differentiation, the calculation process is reduced by differentiating the seismic wave detection section with respect to the seismic intensity.

In the seismic wave detection system according to the present invention, there is provided an earthquake detection system for receiving seismic waves, comprising: an input / output communication terminal (10) for inputting a signal output from the seismic wave detection device to an inside; A band pass filter 12 which removes various noise signals from the signals input from the input / output communication terminal 10; After receiving and filtering the seismic wave signal from the band pass filter 22, the ratio of the short time average and the long time average of the seismic wave signal is set to a predetermined value of a time window. The seismic wave change rate measuring unit 14 for measuring the seismic wave signal change rate by the short time average (ST) and the long time average (LT) sections that check the values while crossing each other, and the analog signal measured by the seismic wave change rate measuring unit 14 The control unit having seismic wave variable substitution, storage, recording control, management function, and arithmetic module so that the derivative can be controlled by the slope when the derivative is differentiated by the differentiator 16 and the differentiator 16 ( 200); An LCD display unit 22 displaying seismic data generated in the field under the control of the controller 200; The data output unit 24 has analog and digital output modes so that the data output from the control unit 200 can be observed in the control room in association with SCADA (Supervisory Control And Data Acquisition).

 Band pass filter, Seismic wave change rate measuring unit, Differentiator, Control unit

Description

Seismic wave detection system

1 is a control block diagram of seismic wave reception for a seismic wave detection system according to the present invention;

2 is a detailed view of a control unit of the seismic wave receiving apparatus shown in FIG. 1, and

Figure 3 is a graph showing the comparison of the slope by measuring the rate of change of seismic waves according to the present invention.

Explanation of symbols on the main parts of the drawings

10: I / O communication terminal

12: band pass filter

14 seismic wave change rate measuring unit

16: differential

18: internal memory

200: control unit

The present invention relates to a system and method for detecting seismic information with seismic waves, and more particularly, according to the signal-to-noise ratio for detecting seismic waves, the seismic waves are reduced in proportion to the width of the time window section to reduce the error of the fine section. A seismic wave detection system in which the calculation process is reduced.

Recently, many manufacturers have researched and developed an SNR seismic detector capable of detecting seismic waves according to a signal noise ratio (SNR).

The SNR seismic wave detector calculates the average amplitude in two different sections and analyzes seismic response characteristics and obtains the strength of the earthquake using an SNR algorithm that determines the detection of the signal when the ratio of the two sections exceeds a certain size. Is taking.

Here, the SNR (Signal Noise Ratio) method for detecting seismic waves implemented by the SNR seismic detector detects a ratio of a short time average and a long time average to a constant value of a time window. By checking the values while crossing, the seismic wave is detected according to the ratio between the short time average (ST) and the long time average (LT) intervals.

Therefore, the SNR method using the SNR seismic detector can only obtain a ratio of less than 10 to a good seismic wave. Therefore, the detection of the seismic wave is inevitably large in proportion to the width of the time window section. A lot of calculations are required, which increases the load on the seismic wave detection system and takes more time to reach the result.

Therefore, this SNR seismic wave detector uses an SNR algorithm that detects seismic waves by simply adopting the width of the interval between amplitudes.In the case of stations with high noises, the station can not detect seismic waves because it compares with absolute values. The larger the width of the interval, the larger the error, and it is difficult to clearly identify the seismic wave detection section by the seismic wave receiver based on the ratio of the magnitude of the seismic wave. There is a problem in that it acts as an error occurrence factor in the earthquake analysis because it is greatly affected by.

Thus, in order to solve the problems of the prior art, the present invention, by reducing the error of the minute section, even in the case of the station with a large noise, the magnitude of the section width by the interval time window between amplitudes by the seismic wave change rate measurement unit It is an object of the present invention to provide a seismic wave detection system in which a calculation process is reduced by differentiating a seismic wave detection section with respect to the strength of a seismic wave through a differential that differentiates measured analog signals.

 The present invention is to achieve the above object, the seismic wave detection system according to the present invention in the seismic wave detection system for receiving seismic waves,

An input / output communication terminal 10 for inputting a signal output from the seismic wave sensing device into the inside; A band pass filter 12 which removes various noise signals among the signals input from the input / output communication terminal 10; After receiving and filtering the seismic wave signal from the band pass filter 22, the ratio of the short time average and the long time average of the seismic wave signal is set to a predetermined value of a time window. The seismic wave change rate measuring unit 14 for measuring the seismic wave signal change rate by the short time average (ST) and the long time average (LT) sections that check the values while crossing each other, and the analog signal measured by the seismic wave change rate measuring unit 14 Differential differentiator 16 and control unit 200 with seismic wave variable substitution, storage, record control, management function, and arithmetic module so that any two sections can be controlled by the slope when differentiation is performed by the differentiator 16. ); An LCD display unit 22 displaying seismic data generated in the field under the control of the controller 200; The data output unit 24 has analog and digital output modes so that the data output from the control unit 200 can be observed in the control room in association with SCADA (Supervisory Control And Data Acquisition).

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should also be noted that the same elements in the figures represent the same signs wherever possible. Also in the following description specific details are set forth in order to provide a more thorough understanding of the present invention.

Hereinafter, the present invention will be described more clearly with reference to the accompanying drawings, FIGS. 1, 2, and 3 as follows.

1 is a control block diagram of the seismic wave reception for the seismic wave detection system according to the present invention, Figure 2 is a detailed view of the control unit of the seismic wave receiving apparatus shown in FIG.

As shown, reference numeral 10 denotes an input / output communication terminal of the seismic wave sensing device; 12, a band pass filter; 14, a seismic wave change rate measuring unit for measuring data output of seismic wave change, 16 is a differentiator, 18 is an internal memory, 200 is a control unit; 22 is an LCD display unit; 24 is represented by the data output unit 24.

The seismic wave detection system according to the present invention has an error in the fine section so that the seismic wave change rate is measured by measuring the seismic wave change rate by the short time average and long time average intervals for the seismic wave signal for more accurate analysis of the earthquake. In order to detect seismic waves even in a station with a large amount of normal noise.

In the seismic wave detection system of the present invention, the input / output communication terminal 10 is an input / output communication terminal that inputs / outputs data of an earthquake situation when an earthquake occurs, and inputs and outputs a signal output from the seismic wave detection device into the device through the input / output terminal 10. do.

The bandpass filter 12 properly processes signals input from the input / output communication terminal 10 to remove various noises, analyzes frequency components and waveforms, and selects only necessary signals having a set bandwidth.

The seismic wave change rate measuring unit 14 receives the seismic wave signal from the band pass filter 12 and filters the seismic wave signal, and then determines a ratio of a short time average and a long time average to the seismic signal. The seismic wave signal change rate is measured by the short time average (ST) and long time average (LT) intervals, which check the value while crossing the interval value of the window (TimeWindow).

The differentiator 16 differentiates the analog signal measured by the seismic wave change rate measuring unit 14.

The control unit 200 is composed of a micro-processor in the seismic wave receiving apparatus. In addition, the control unit 200, when performing the derivative by the differentiator 16, the internal memory 18 to allow the assignment, storage, recording control, management, and calculation of seismic wave variables so that any two sections can be controlled by the slope. ), The internal memory 18 has a shock and seismic identification capability by frequency analysis when a value above a predetermined alarm value is input and stores these values.

In other words, in the seismic wave detection system according to the present invention, the controller 200 is influenced by noise by the 'tilt change rate' method, which calculates a waveform as a slope of a straight line among algorithms stored in the internal memory 18 electrically connected thereto. It includes a picking algorithm to receive less. The control unit 200 receives a signal from the band pass filter 22, processes the signal, and outputs the signal to the data output unit 31. The control unit 200 controls overall functions, assigns variables, stores, writes controls, manages functions, and calculates the signals. The algorithm is performed, and the SI and acceleration are calculated to obtain the SI and the maximum ground acceleration.

On the other hand, the control unit 200 is a touch screen input unit configured on the surface of the LCD display unit 28, an alarm means for outputting an alarm by the siren when a value greater than or equal to the threshold set by the control unit 200, and the control unit; As a storage medium for storing the earthquake situation data output from the (200), an external memory card that can be stored for re-analysis after collection at the site for use as a measure of recovery of the size and damage of the earthquake after the end of the situation can be included. Yes (not shown).

The LCD display unit 22 is an earthquake or normal ground acceleration generated in the field under the control of the control unit 200 as a change rate of the seismic wave signal by the short time average (ST) and the long time average (LT) section for the seismic wave signal. Display the value.

In addition, the data output unit 24 connected to the control unit 200 is connected to the Supervisory Control And Data Acquisition (SCADA) data output from the control unit 200 to observe the output mode of the analog and digital Have

Therefore, the seismic wave detection system according to the present invention reduces the error of the microdivision to reduce the detection error by reducing the magnitude of the interval width between the amplitudes for detecting the seismic wave even in the case of the station with a large noise. The calculation process is reduced by allowing the seismic wave receiver to discriminate the seismic wave detection section clearly based on the ratio value for.

FIG. 2 is a detailed view of a control unit of an earthquake wave receiving apparatus in the seismic wave detection system shown in FIG. 1.

In the seismic wave detection system according to the present invention, the control unit 200 incorporates a slope change rate algorithm, and controls various operation information and functions of the site such as earthquake or normal ground acceleration value generated in the field.

In addition, the control unit 200 is an average value calculation unit 210 for continuously averaging the absolute value of the slope between two points of a predetermined minute unit of the waveform data for the seismic wave input through the input and output terminal 20 at the earthquake station, the average value Comparing unit 220, the average value calculation unit 210 and the comparison unit for comparing the average value of the specific section rather than comparing the slope of the last section and the value of the interval unit while calculating the average in the calculation unit 210 When the 220 detects or compares the time window section widths of the seismic wave signals, the change rate measuring unit 230 measured under the control of the controller 200, and based on the measured value measured by the change rate measuring unit 230. It includes a measurement value calculation unit 240 for performing the calculation.

    The change rate measuring unit 230 compares the average value calculating unit 210 and the comparing unit 220 to detect the seismic wave, and according to the control of the control unit 200, the short time average ST and the long time of the seismic wave signal are controlled. The seismic signal change rate due to the mean (LT) interval is measured up to 100 or more.

    The calculation unit 2230 performs algorithms such as control and substitution of variables, storage, recording control, management functions, and calculations based on the measured values measured by the change rate measuring unit 230.

    In addition, in the seismic wave detection system of the present invention, the control unit 200 includes a noise filter 240 that excludes a noise signal generated by a certain situation of the station while selecting a signal of a sensor due to a temporary shock in a seismic wave form. Thus, by measuring the change in the signal up to a certain time after the seismic wave signal is detected by the change rate measuring unit 230 to detect only the more seismic waves.

    Next, the operation of the present invention will be described in detail with reference to a graph showing a comparison of the slopes of FIG. 3 illustrating an embodiment of the present invention.

First, the function Y = x is a straight line at a 45 degree angle with a slope of 1.

However, as the value of a of the function Y = ax increases, the straight line becomes vertical, and the value of a (tilt) has infinity, so the difference between the normal reference slope and the measured slope in the signal detection section is visually shown in FIG. 3. There will be a greater difference than can be seen in the table.

Therefore, as shown in Figure 3, the method of measuring the change rate of tilt of the seismic wave receiving apparatus is able to clearly find the point where the actual seismic wave is detected. In addition, in order to minimize the error caused by the temporary signal, the effect can be minimized by detecting whether the signal is maintained by verifying the data from a certain period from the initial detection.

1 and 2 will be described with reference to the tilt change rate measurement method to be less affected by noise by the 'tilt change rate method' of the seismic wave receiving apparatus shown in FIG.

In addition, the signal produced by the observation equipment in the seismic wave detection system is a digital signal and has a waveform form. That is, when the seismic wave signal measured by the seismic wave change rate measuring unit 14 is an analog signal, it may be represented by a curve, and as the derivative is differentiated by the differentiator 16, any two sections may be represented by a straight line.

The straight lines included in the waveform have a constant slope, and if the same waveform persists, the slope is not significantly different from the previous slope and is maintained at a ratio of about 0.5 to 1.5. If you have an average slope higher than that, you may have problems with the reliability of the data as a station with a lot of usual signals.

Therefore, in the seismic wave detection system of the present invention, the slope value becomes very large when the seismic wave is detected while maintaining a constant rate of change. Will be detected.

Therefore, the seismic wave detection system of the present invention reduces the error of the microdivision to reduce the interval between the amplitudes by the interval time window, which is formed on the basis of the ratio value output from the seismic wave change rate measuring unit even in the case of a station with a large noise level. By reducing the size, the detection error is reduced, and the calculation process for differentiating and determining the seismic wave detection section with respect to the strength of the seismic wave through the differentiation that differentiates the analog signal measured by the seismic wave change rate measuring unit yields excellent results. Can be.

 Embodiment of the present invention is for the purpose of illustration, those of ordinary skill in the art, modifications, changes, replacements will be possible through the technical scope illustrated in this specification.

Claims (3)

In the seismic wave detection system for receiving seismic waves, An input / output communication terminal 10 for inputting a signal output from the seismic wave sensing device into the inside; A band pass filter 12 which removes various noise signals from the signals input from the input / output communication terminal 10; After receiving and filtering the seismic wave signal from the band pass filter 22, the ratio of the short time average and the long time average of the seismic wave signal is set to a predetermined value of a time window. The seismic wave change rate measuring unit 14 for measuring the seismic wave signal change rate by the short time average (ST) and the long time average (LT) sections that check the values while crossing each other, and the analog signal measured by the seismic wave change rate measuring unit 14 Differential differentiator 16 and control unit 200 with seismic wave variable substitution, storage, record control, management function, and arithmetic module so that any two sections can be controlled by the slope when differentiation is performed by the differentiator 16. ); An LCD display unit 22 displaying seismic data generated in the field under the control of the controller 200; Seismic wave detection system comprising a data output unit 24 having an analog and digital output mode to observe the data output from the control unit 200 in the control room in conjunction with SCADA (Supervisory Control And Data Acquisition) . The method of claim 1, The control unit 200 is an average value calculation unit 210 for averaging the waveform data for the earthquake waves coming through the input and output terminal 10 at the earthquake station, the average value calculation unit 210 while averaging the value of a specific specific point The change rate measured under the control of the control unit 200 when the comparison unit 220, the average value calculation unit 210 and the comparison unit 220 compare or compare the time window section width of the seismic wave signal by reference Seismic wave detection system comprising a measurement unit 230, and a measurement value calculation unit 240 for performing a calculation based on the measured value measured by the change rate measurement unit (230). The method of claim 1, The change rate measuring unit 230 compares the average value calculating unit 210 and the comparing unit 220 to detect the seismic wave, and according to the control of the control unit 200, the short time average ST and the long time of the seismic wave signal are controlled. Seismic wave detection system characterized in that the measurement of the seismic wave signal change rate by the average (LT) interval up to 100 or more.

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