JP6239482B2 - Geophysical exploration system and data recording apparatus - Google Patents

Description

  The present invention relates to a technique for processing data acquired by a sensor device such as a geophone that constitutes an earthquake exploration system.

  In order to mine underground resources such as oil and natural gas, it is necessary to conduct underground resource exploration to identify the location where the underground resources exist. Exploration of underground resources such as oil and natural gas proceeds through the following steps, for example. First, as a first stage, an evaluation called wide area geological evaluation is performed. In the wide-area geological evaluation, analysis of aerial photographs and satellite photographs of the exploration target area, investigation of the distribution of gravity and magnetic force, etc. are performed, and the possibility of the existence of underground resources in the deep underground is evaluated to narrow down the exploration target area. Next, as a second stage, physical exploration is performed in the narrowed area. Geophysical exploration is an exploration method that analyzes the state of the subsurface by artificially generating physical phenomena on the surface and measuring their reactions. Analyze and evaluate the underground structure using geophysical exploration in the narrowed area.

  Reflective seismic exploration is an effective method for understanding geological structures underground in geophysical exploration. The seismic reflection method is a geophone that applies artificial vibrations to the surface of the earth and the reflected waves generated by the elastic waves generated by the vibrations propagating through the ground and reflected at the boundary of the strata. It is a method to reproduce and grasp the underground structure by observing and recording, and analyzing changes in the time until the reflected wave is observed and the amplitude of the reflected wave.

  The system used to perform this seismic reflection survey is an epicenter that artificially generates vibration, a geophone that observes the vibration, a data recording device that records the observed vibration, and a data collection device that collects the recorded data. Composed.

An epicenter is an energy source that generates vibration. Although there is a method of generating a pulse waveform by impact of dynamite or the like, dynamite is difficult to use in urban areas due to ground damage and safety problems. Therefore, the vibrator system is used as a non-explosive type epicenter. The vibrator method is a method in which a vibrating device is brought into contact with the ground surface to vibrate. In the vibrator system, the frequency of vibration is set according to the physical properties of the underground, and weak vibration is applied for several seconds to several tens of seconds. The vibration energy generated by applying a weak vibration several times for several seconds to several tens of seconds with a vibrator is equivalent to the pulsed vibration energy generated by an impact such as dynamite by data processing.
The geophone is equipped with a sensor that can observe minute vibrations, and converts the observed vibrations into data corresponding to the vibrations.
The data recording device is a device for recording vibration data observed by a geophone. The data collection device is a device that collects data recorded in a plurality of data recording devices.

  The data received by the geophone, recorded in the data recording device, and collected by the data collecting device is sent to the processing center where the computer is installed. In the processing center, data is analyzed by a plurality of processes such as a correction process, a correlation process, and a superposition process, and a boundary surface of the formation is calculated to create an underground structure map. In addition to reflected waves, the geophone also observes surface waves that travel along the ground surface that are noisy, and vibration waves that are caused by wind, rain, automobiles, and workers walking, and these are superimposed on the reflected waves as noise. Has been. Data analysis also requires processing to reduce noise.

In addition, in order for the data collection device to collect data observed by the geophone, a data collection network for performing data communication between the geophone, the data recording device, and the data collection device is required.
One of the data collection networks is a wired communication network system. The wired communication network system is a system in which data is collected in a data collection device in real time by connecting the geophones, between the geophone and the data recording device, and between the data recording device and the data collection device. Although this system has an advantage that data can be confirmed in real time, the amount of cables connecting between apparatuses becomes enormous, and a lot of labor is required for transportation. In addition, there is a problem that the amount of work for installing geophones and cables in the exploration area increases. In addition, there is a problem that the amount of work required for maintenance such as replacement due to cable damage and confirmation of disconnection inside the cable becomes very large.
In recent years, in order to improve the accuracy of analysis, the construction of exploration systems in which tens of thousands of geophones are installed in the exploration area has become mainstream. If a survey system that uses tens of thousands of geophones is constructed with a wired communication network system, the above problem becomes more serious.

  In order to solve this problem, a system called a cable-free system has been developed in which the geophone and the data recording device are independent from each other, and the geophone and the data recording device are not connected by a cable. The cable-free system installs a geophone and a data recording device in the exploration area for a certain period of time. During this time, the data acquired by the geophone is continuously stored in the data recording device. This is a system in which after receiving data for a certain period, the geophone and the data recording device are collected, and the data accumulated in the data recording device is collected in the data collecting device. The cable-free system greatly reduces the amount of work for cable transportation and maintenance.

  However, in the cable-free system, it is not possible to confirm whether or not the data has been normally acquired until the data collection device collects the data acquired after the data acquisition period in the exploration area ends. In other words, problems such as failure of the geophone and data recording device, inaccurate installation of the geophone, etc. reveal that the acquired data cannot be used for analysis after data collection. The normality cannot be confirmed. For this reason, when there is a deficiency in data acquisition in many geophones, it is necessary to re-acquire data.

Therefore, a system called a wireless collection system has been proposed in which a radio communication function is implemented in a geophone and a data recording device, and data is collected in the data collection device using wireless communication even during a data acquisition period. ing.
For example, Patent Document 1 proposes a data relay transfer method between geophones that sequentially transfers data from the geophone 1 to the geophone 2 and the geophone 3 using wireless communication as a data collection method in the radio collection system. Has been.

US2011 / 0116344

  A system for collecting physical exploration data in a data collection device using wireless communication is classified into two types according to the type of data transmitted to the data collection device. One is a system that transmits the acquired data itself, and the other is only the information on the operating status of the geophone and data recording device, such as quality control (QC) information, such as the remaining battery level and operating status. System.

The system that transmits the data itself has the advantage that the normality of the data can be confirmed by the data collecting device confirming the data, while the data capacity to be transmitted by wireless communication is large, and the consumption of the geophone and the data recording device There is a problem that electric power increases. The amount of data acquired by one geophone and data recording device is several gigabytes per day. Since the amount of data transmitted from the geophone or the data recording device to the data collection device using wireless communication is enormous, the power consumption of the geophone or data recording device in wireless communication increases.
There are several methods for wirelessly transmitting data from a data recording device to a data collection device in a system that transmits the data itself. One is a method in which data is directly transmitted from all data recording devices to the data collecting device, and another method is to collect data via an adjacent data recording device as described in Patent Document 1. There is a method of relaying data to a device. The former has the problem that the transmission power increases because the distance between the data collection device and the data recording device increases, and the latter has the problem that the data transmission amount of the data recording device in charge of the relay increases. Therefore, a large capacity battery is required for the geophone and the data recording device, which increases the cost and weight of the device.

  The system that transmits only the QC information has an advantage that the operation status of the geophone and the data recording device can be confirmed by the QC information without the data collecting device confirming the data itself. However, there is a problem that even if the operation state can be confirmed, the data collection device cannot confirm the normality of the data itself.

  The normality of the data can be confirmed by restoring the reflected wave from the data acquired by the geophone and the data recording device and extracting information such as the amplitude and arrival timing of the reflected wave. However, as described above, since a lot of noise is superimposed on the reflected wave acquired by the geophone and the data recording device, the amplitude and the amplitude or the noise must be improved unless processing for improving the SN ratio of the reflected wave and the noise is performed. Information such as arrival timing cannot be extracted.

  The present invention relates to a system in which a data recording device transmits data to a data collection device, and the data recording device reduces the data volume transmitted to the data collection device by wireless communication, thereby reducing power consumption in the data recording device. With the goal.

  Another object of the present invention is to enable a data recording apparatus to check data normality in a data collecting apparatus in a system that transmits QC information to the data collecting apparatus.

In order to solve the above problems, in the present invention, a vibrator that generates vibration, a plurality of geophones that measure vibration wave data, a plurality of data recording devices that hold vibration wave data measured by the geophone, In a physical exploration system having at least a data collection device that collects vibration wave data recorded by a data recording device, the data recording device has a position information acquisition unit, and the data recording device acquires position information by the position information acquisition unit. And holding an ID for uniquely identifying the data recording device in the physical exploration system in advance,
The data collection device acquires the ID and position information of the data recording device in advance and, based on the acquired ID and position information of the data recording device, replaces the data recording device in the physical exploration system with a plurality of adjacent data recording devices. Grouped into a plurality of groups and set parameters for communication within the group for each group and notify the data recording device,
The data recording device performs communication within the group according to the notified parameter, transmits vibration wave data held by the data recording device within the group to the designated data recording device within the group, and the designated data recording device In this example, correlation processing is performed on adjacent vibration wave data held by the adjacent data recording device and vibration wave data held by itself, and the result of the correlation processing is transmitted to the data collection device.

According to the present invention, the normality of acquired data of the data recording apparatus can be confirmed without transmitting the data itself.
Further, according to the present invention, it is possible to reduce power consumption in the data recording apparatus by reducing the data capacity to be transmitted.

It is a figure explaining the structure of the physical exploration system in one Example of this invention. It is a figure explaining the structure of the data recording device in one Example of this invention. It is a figure explaining the structure of the data collection device in one Example of this invention. It is a figure which shows the data storage image of the information which the data recording device in one Example of this invention transmits to a data collection device, the parameter storage part (vibrator) of a data collection device, and a parameter storage part (data recording device). It is a figure explaining the parameter of the parameter storage part (data recording device) of the data collection device in one Example of this invention. It is a figure explaining the content of the pre-processing of the vibration wave data in one Example of this invention. It is a flowchart explaining the correlation process of the data recording device in one Example of this invention. It is a figure which shows the display image of the data display part of the data collection device in one Example of this invention. It is a flowchart explaining the correlation process and compression process of the data recording device in one Example of this invention.

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

First, the configuration of the entire physical exploration system to which the present invention is applied will be described.
FIG. 1 is a diagram for explaining the configuration of a physical exploration system in one embodiment of the present invention.

  The geophysical exploration system includes a vibrator 101 that applies vibration to the ground surface, geophones 102A, 102B, and 102C that measure vibration, and data recording devices 103A, 103B, and 103C that store data measured by the geophone in an internal recording area. A data collecting device 104 that collects data stored in the recording devices 103A, 103B, and 103C, and a relay device 105 that relays data transmission when the data recording device transmits data stored therein to the data collecting device. . In the example shown in FIG. 1, the geophone 102 and the data recording apparatus 103 are connected by a wired line, the data recording apparatus 103 and the relay apparatus 105 perform wireless communication, and the relay apparatus 105 and the data collection apparatus 104 are connected by a wired line. An example of the configuration connected in FIG. In addition to this, the geophone 102 and the data recording device 103 and the relay device 105 and the data collection device 104 may be connected by a wireless line.

  The relay device 105 has a function of performing wireless communication by a method such as Wi-Fi (registered trademark) or ZigBee (registered trademark) and a function of performing wired communication using an optical fiber or a coaxial cable, and the data recording devices 103A and 103B. , 103C and wireless communication.

  Further, the data recording devices 103A, 103B, and 103C have a function of performing wireless communication by a method such as Wi-Fi (registered trademark) or ZigBee (registered trademark), and perform wireless communication between the data recording devices.

  The data collection device 104 has a function of performing wired communication using an optical fiber or a coaxial cable, and communicates with the relay device 105. The data collection device 104 has a function of collecting data and a function of controlling the vibrator 101 and the data recording device. The data collection device 104 transmits parameters for controlling these devices to the data recording devices 103A, 103B, and 103C via the relay device 105, and transmits the parameters to the vibrator 101 using wireless communication. The wireless communication between the data collection device 104 and the vibrator 101 may use a wireless communication method different from the wireless communication between the data recording device and the relay device 105.

  The vibrator 101 has a function of acquiring time information and position information from a GPS (Global Positioning System) signal, a function of managing the acquired time information and position information, and wireless communication in addition to a function of applying vibration to the ground surface. It has a function to perform and communicates with the data collection device 104. Vibrator 101 applies vibrations based on the parameters transmitted from data collection device 104 to the ground surface.

FIG. 2 is a diagram illustrating the configuration of the data recording apparatus 103 according to an embodiment of the present invention.
The data recording apparatus includes a geophone IF (MEMS) 208 serving as an interface with a geophone using a micro electro mechanical systems (MEMS), and a geophone IF 209 serving as an interface with a geophone. The A / D converter 210 that converts an analog signal of speed information observed by the geophone input from the geophone IF (geophone) 209 into a digital signal, and applies the transfer function to the speed information converted into the digital signal to obtain acceleration information. Transfer function unit 211 for conversion, acquired data storage unit 203 for storing data received by the geophone IF 208 and data converted by the transfer function unit 211 into acceleration information, adjacent data for storing acquired data from other adjacent data recording devices Storage unit 202, acquisition data storage An arithmetic unit 201 that performs arithmetic processing such as division, addition, and multiplication on the data stored in 203, and comparison processing with data stored in the adjacent data storage unit 202, arithmetic data that stores processing results in the arithmetic unit 201, and the like Storage unit 204, wireless transmission unit (relay device) 216 that transmits data stored in operation data storage unit 204 to a relay device using a wireless method such as Wi-Fi (registered trademark) or ZigBee (registered trademark), relay A wireless reception unit (relay device) 215 that receives a wireless communication signal from the device, a parameter storage unit 218 that extracts and stores a parameter from the demodulated data, and a wireless reception unit that receives acquired data of another adjacent data recording device (adjacent Data recording device) 205, wireless transmission unit (adjacent data recording device) 206 for transmitting acquired data to other adjacent data recording devices, GPS signal A GPS signal receiving unit 207 for receiving the signal, a time management unit 217 for managing time information extracted from the received GPS signal, a battery 213 for driving each unit of the data recording device 103, an external device for charging the battery 213, and The charging IF 214 serving as an interface of the external device, and the external device IF 212 serving as an interface with an external device when data in the acquired data storage unit 203 is extracted.

FIG. 3 is a diagram illustrating the configuration of the data collection device according to an embodiment of the present invention.
The data collection device 104 includes a parameter storage unit (vibrator) 301 that stores parameters for controlling the vibrator, a wired IF 302 that serves as an interface for communication with the relay device 105, and a data storage unit 303 that stores data received by the wired IF. , A display unit 304 that displays stored data, a wireless transmission / reception unit 305 that performs wireless communication with a vibrator, and a parameter storage unit (data recording device) 306 that stores parameters for controlling the data recording devices 103A, 103B, and 103C Consists of

  Next, regarding the operations of the geophones 102A, 102B, and 102C, the data recording devices 103A, 103B, and 103C, the data collection device 104, the vibrator 101, and the relay device 105 in the present embodiment, before the vibration is applied and during the vibration application. The description will be divided into three steps after applying the vibration.

First, the operation of each device before applying vibration by the vibrator 101 will be described.
The geophones 102A, 102B, and 102C, the data recording devices 103A, 103B, and 103C, the relay device 105, the data collection device 104, and the vibrator 101 are arranged in the search area.
An ID is set in advance for each of the data recording devices, and each data recording device transmits the ID and position information obtained from the GPS signal to the data collection device 104 via the relay device 105.

FIG. 4A is a diagram for explaining information transmitted from the data recording apparatus to the data collection apparatus according to an embodiment of the present invention.
FIG. 4B is a diagram illustrating a data storage image of the parameter storage unit (vibrator) of the data collection device according to the embodiment of the present invention.
FIG. 4C is a diagram showing a data storage image of the parameter storage unit (data recording device) of the data collection device according to the embodiment of the present invention.

FIG. 5A is an image diagram of a data recording device information storage table of the data collection device.
FIG. 5B is a diagram illustrating parameters that the data collection device transmits to the data recording device.
FIG. 5C is a diagram illustrating parameters that the data collection device transmits to the data recording device.

  As shown in the transmission information table in FIG. 4A, the data recording apparatus including 103A, 103B, and 103C sends the data recording apparatus ID and the position information of the data recording apparatus to the data collection apparatus 104 via the relay apparatus. Send. The data collection device 104 that has received the ID and position information of the data recording device from each data recording device 103 records the received information in a table as shown in FIG.

  The data collection device 104 divides all the data recording devices into a plurality of groups based on the position information of the data recording devices stored in the table shown in FIG. At this time, the data collection device 104 is divided so that all data recording devices belonging to one group are close to each other and can directly communicate with each other by Wi-Fi (registered trademark) or the like. In this embodiment, the data recording apparatuses 103A, 103B, and 103C constitute one group. In addition, the data collection device 104 considers interference between adjacent groups, and setting information for each data recording device to perform communication between the data recording devices within the group, for example, Wi-Fi (registered trademark). If there is, a service set identifier (SSID), data transmission timing, frequency used for data transmission, priority of data transmission within the group, and the like are determined and stored in the parameter storage unit (data recording device) 306. FIG. 4C shows the parameters for communication between data recording devices in the stored group. In this example, it is assumed that the data collection devices 103A, 103B, and 103C correspond to data transmission priorities 1, 2, and 3, respectively.

As shown in FIG. 4B, the data collection device 104 receives from the vibrator 101 the number of vibrations applied by the vibrator 101 to the ground surface, the application start time of each time, the application time length of each time, which is set in advance by the operator. The position information of the vibrator 101 is stored in a parameter storage unit (vibrator) 301. The data collection device 104 also includes information on the number of vibrations applied by the vibrator 101 to the ground surface, each application start time, each application time length information, and when the data recording devices 103A, 103B, and 103C acquire data. The sampling time is stored in the parameter storage unit (data recording device) 306.
The data collection device 104 transmits to the vibrator 101 information on the number of application times, the application start time of each time, and the application time length of each time stored in the parameter storage unit (vibrator) 301 shown in FIG. The data collection device 104 transmits information in the parameter storage unit (data recording device) 306 to the data recording devices 103A, 103B, and 103C, and the data recording devices 103A, 103B, and 103C send the transmitted information to the parameters in the device. Store in the storage unit 218. Tables of information stored in the parameter storage unit 218 in the data recording apparatus 103 are shown in FIGS.

Vibrator 101 receives and holds the number of vibration applications transmitted by data collection device 104, the application start time of each application, and the application time length of each application.
The data recording devices 103 </ b> A, 103 </ b> B, and 103 </ b> C store the time information obtained from the GPS signal receiving unit 207 in the time management unit 217.

Next, the operation of each device during vibration application by the vibrator 101 will be described.
Vibrator 101 applies vibration to the ground surface in accordance with the number of times of application received from the data collection device, the application start time of each time, and the length of time of each application.
The data recording devices 103A, 103B, and 103C receive from the data collection device and store in the parameter storage unit 218 in the data recording device according to the vibration application start time, the application time length, and the sampling time. During this time, the vibration wave data is continuously acquired from the application start time to a preset time after the application time length, and is stored in the acquired data storage unit 203 of the data recording devices 103A, 103B, and 103C.

  Finally, the operation of each device after application of vibration by the vibrator 101 will be described.

  The data recording devices 103A, 103B, and 103C perform preprocessing on the acquired vibration wave data. Thereafter, the data recording devices 103B and 103C transmit vibration wave data to the data recording device 103A using wireless communication in accordance with the priority order specified by the data collection device 104. The data recording device 103A performs correlation processing between the received vibration wave data of the data recording devices 103B and 103C and its own vibration wave data, and transmits the result to the relay device 105 using wireless communication. The relay device 105 transmits the result of the correlation processing to the data collection device 104 using wired communication.

Next, a preprocessing method will be described.
FIG. 6 is a diagram for explaining the contents of preprocessing of vibration wave data in one embodiment of the present invention.
Vibrator 101 can reproduce the same vibration pattern and apply the vibration pattern a plurality of times. Therefore, the geophones 102A, 102B, and 102C observe vibration waves in which noise is superimposed on reflected waves having the same pattern. As shown in FIG. 6, when the data stored in the data recording devices 103A, 103B, and 103C is divided at the beginning of each vibration application start time of the vibrator, the reflected wave data is included at the same position of each divided data. It will be.
The calculation unit 201 of the data recording devices 103A, 103B, and 103C divides the data stored in the acquired data storage unit 203, starting with each vibration application start time of the vibrator 101, and adds the data to calculate Stored in the data storage unit 204 as addition data.

  While the reflected wave pattern included in the vibration wave data observed by the geophone is the same every time, the noise is different every time. Therefore, by the above addition processing, data with an enhanced reflected wave portion can be generated, and the data amount can be reduced to 1 / number of applications without losing the validity of the data. Further, by enhancing the reflected wave portion, the SN ratio of the reflected wave and noise is improved.

Next, correlation processing of vibration wave data will be described.
FIG. 7 is a flowchart for explaining correlation processing of vibration wave data in one embodiment of the present invention.
Since the data recording devices 103A, 103B, and 103C are close to each other, the waveforms of the reflected waves are similar to each other. On the other hand, due to the difference in the positional relationship between the vibrator 101 and the data recording device, the arrival time of each reflected wave differs depending on the difference in propagation path length and propagation speed of each reflected wave. Since the number of reflected waves with large amplitude included in the vibration wave data is limited, the measurement data between the data recording devices is high if the correlation value is calculated by shifting the difference in arrival time of the vibration waves in each data recording device. It is thought that a correlation value is obtained. FIG. 7 shows a process for calculating the maximum correlation value and the time shift at which the correlation value is maximum.

  Specifically, in step S1, MaxC that finally represents the maximum correlation value and MaxT that finally represents the maximum time lag are initialized. In step S2, a counter τ representing a time lag is initialized. Correlation between stored data (hereinafter, data 1) of self (here, data recording apparatus 103A) and stored data (hereinafter, data 2) of adjacent (data recording apparatus 103B or 103C) shifted by τ in step S3 Calculate the value. It is confirmed whether or not the correlation value calculated in step S4 exceeds MaxC, which is the maximum correlation value up to the time difference τ-1. If it exceeds, the correlation value calculated in step S3 is substituted for MaxC in step S5, and τ is substituted for MaxT. By repeating this until τ reaches time T, it is possible to calculate the maximum correlation value in all times and the time shift at which the correlation value is maximum. The data recording device 103A calculates the maximum correlation value in each combination of the data recording devices 103A and 103B, 103A and 103C, and 103B and 103C, and the time lag at which the correlation value is maximized, and transmits the data to the data collection device 104.

Next, a data display method in the data collection device 104 will be described with reference to FIG.
FIG. 8 is a diagram showing a display image of the data display unit of the data collection device in one embodiment of the present invention.
The data collection device 104 displays the data on the display unit 304 according to the position information of each data recording device 103 received from the data recording device 103.
A cross mark in the center of FIG. 8 represents the position of the vibrator 101, and a circle around the cross mark represents a data recording apparatus.
The size of each circle indicates the distance from the vibrator 101. The data recording devices 103A, 103B, and 103C are arranged at positions corresponding to the position information, and are surrounded by dotted lines indicating that 103A, 103B, and 103C are one group. Based on the correlation value information received from the data recording device, the data collection device highlights on the display unit 304 the data recording device that may not be operating normally. In this example, the data recording device 103C is highlighted.

For example, there are the following two cases in which the data recording device 103C is highlighted.
One is a case where the correlation value between 103A and 103B is high, while the correlation value between 103A and 103C and between 103B and 103C is low.
The other is that the time lag between 103A and 103B falls within the range estimated from both distances, while the time lag between 103A and 103C and 103B and 103C exceeds the range estimated from both distances. It is a case.

  As described above, in the data collection device 104, the normality of the data acquired by the data recording device 103 can be confirmed.

  Data stored in the acquired data storage unit 203 of the data recording device 103 can be collected by collecting the data recording device 103 from the search area and then outputting it from the external device IF 212.

When the geophone is composed of a geophone, the transfer function processing unit 211 performs processing for converting from relative speed to absolute acceleration before the above-described preprocessing.
The geophone 102 and the data recording device 103 in the present invention may be an integrated device.

In the second embodiment, a data compression method in the data recording apparatus 103 will be described.
Since the overall system configuration in the present embodiment is the same as that in the first embodiment, description thereof is omitted.
The operation of each device in this embodiment will be described. Note that the operations up to the correlation process before the vibration application, during the vibration application, and after the vibration application are the same as those in the first embodiment, and thus the description thereof is omitted.
At the stage of the correlation process, the data recording device 103A has the measurement data of the data recording devices 103B and 103C. As described with reference to FIG. 7 of the first embodiment, the measurement data of the data recording devices 103A, 103B, and 103C are similar if they are shifted by the difference in arrival time. Therefore, the information amount of difference data between the two measurement data is small. In other words, it is expected to become smaller when the data compression process is performed on the difference data. By utilizing this, instead of compressing and transmitting the measurement data of the data recording devices 103A, 103B, and 103C, the measurement data of the data recording device 103A, the difference data of 103A and 103B, and the difference data of 103A and 103C, respectively The amount of data to be transmitted is reduced by compressing and transmitting.

The vibration wave data compression process will be described with reference to FIG.
FIG. 9 is a flowchart for explaining correlation processing and compression processing of vibration wave data in one embodiment of the present invention.
Steps S1 to S6 are the same as those in FIG. In step S7, data 1 is compressed. In step S8, the difference between data 1 and data 2 shifted by Maxτ is calculated and compression is performed. In step S9, the calculation result of step S7, the calculation result of step S8, and Maxτ are transmitted to the data collection device 104 via the relay device 105. The received data collection device 104 restores data 1 by decompressing the calculation result of step S7, and restores data 2 by shifting the calculation result of step S8 by Maxτ and subtracting it from data 1.
In this way, in the wireless collection system that transmits data, the data volume to be transmitted can be reduced, and the power consumption in the data recording apparatus can be reduced.

DESCRIPTION OF SYMBOLS 101 Vibrator 102 Geophone 103 Data recording device 104 Data collection device 105 Relay device 201 Arithmetic unit 202 Adjacent data storage unit 203 Acquired data storage unit 204 Arithmetic data storage unit 205 Wireless reception unit (adjacent data recording device)
206 Wireless transmitter (adjacent data recording device)
207 GPS signal receiver 208 Geophone IF (MEMS)
209 Geophone IF
210 A / D converter 211 Transfer function processor 212 External device IF
213 Battery 214 Charging IF
215 Wireless receiver (relay device)
216 Wireless transmitter (relay device)
217 Time management unit 218 Parameter storage unit 301 Parameter storage unit (vibrator)
302 Wired IF
303 Data storage unit 304 Display unit 305 Wireless transmission / reception unit 306 Parameter storage unit (data recording device)

Claims (5)

Vibrators that generate vibrations, a plurality of geophones that measure vibration wave data, a plurality of data recording devices that hold vibration wave data measured by the geophones, and vibration wave data recorded by the plurality of data recording devices A geophysical exploration system having at least a data collection device for collecting
The data recording apparatus has a position information acquisition unit, acquires and holds position information by the position information acquisition unit, and uniquely identifies the data recording apparatus within the previously assigned physical exploration system I have an ID,
The data recording device transmits the ID and the position information to the data collection device,
The data collection device groups data recording devices in the physical exploration system into a plurality of groups including a plurality of adjacent data recording devices based on the ID and the position information, and communicates within the group. Set the parameters to do and notify the data recording device,
The data recording device performs communication within the group according to the parameter, and transmits vibration wave data to a designated data recording device within the group,
The designated data recording device performs correlation processing on the vibration wave data received from the data recording devices in the group and the vibration wave data held by the designated data recording device itself, and results of performing the correlation processing Is transmitted to the data collection device. The geophysical exploration system according to claim 1,
The designated data recording device calculates a difference between the vibration wave data held by the designated data recording device itself and the vibration wave data received from the data recording device in the group and transmits the difference to the data collecting device. A geophysical exploration system characterized by A vibrator that generates vibration, a plurality of geophones that measure vibration wave data, a plurality of data recording devices that hold vibration wave data measured by the geophone, and a collection of vibration wave data recorded by the data recording device The data recording device in a physical exploration system having at least a data collecting device for
A first wireless transmission / reception unit for transmitting / receiving a wireless signal to / from the data collection device; and a second wireless transmission / reception unit for transmitting / receiving a wireless signal to / from a data recording device adjacent to the data recording device;
Correlation processing is performed between the vibration wave data held by the adjacent data recording device received via the second wireless transmission / reception unit and the vibration wave data held by the data recording device itself, and the result of the correlation processing is obtained. A data recording apparatus which transmits to the data collection apparatus via the first wireless transmission / reception unit. The data recording device according to claim 3, wherein
It has a position information acquisition unit, acquires and holds position information by the position information acquisition unit, and holds an ID for uniquely specifying a data recording device in the physical exploration system assigned in advance ,
The data recording device transmits the ID and position information to the data collection device,
The data collection device groups a plurality of data recording devices in the physical exploration system into a plurality of groups of a plurality of adjacent data recording devices based on the ID and position information of the data recording device. Set parameters for communication within the group and notify the data recording device for each group,
The data recording device performs communication within the group according to the notified parameter, and transmits vibration wave data held by the data recording device within the group to a designated data recording device within the group. Data recording device. The data recording device according to claim 3, wherein
A data recording comprising compressing each of the vibration wave data acquired by the data recording device and difference data between the vibration wave data acquired by the data recording device and adjacent vibration wave data and transmitting the compressed data to the data collecting device apparatus.

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