Distributed hybrid networking microseismic signal acquisition method, system, medium and equipment

Abstract

The invention belongs to the field of signal acquisition, and particularly relates to a microseismic signal acquisition method and system for distributed hybrid networking, a medium and equipment. The method comprises the following steps: S1, constructing a local area network covering an upper computer and at least one micro-seismic acquisition station based on network relay equipment; and S2, sending an acquisition instruction to the local area network, and enabling the micro-seismic acquisition station in the local area network to perform micro-seismic signal acquisition. The method has the advantages that the network relay equipment and the micro-seismic acquisition platform are arranged in advance, basic equipment is supported for follow-up establishment of the local area network, in addition, acquisition control and data transmission in the local area network can effectively prevent external interference, and the data transmission efficiency can be further improved.

Description

Background Art

[0002] The circuit noise of the digital circuit part of the existing microseismic acquisition station is easy to interfere with the analog circuit. In addition, the existing microseismic acquisition platform usually uses wired networking, which has a small networking range and requires manual input of acquisition station information during networking. The networking is not flexible and difficult to network in complex terrain.

[0003] In addition, the existing microseismic acquisition platform needs to be connected to the GPS signal at all times during synchronous acquisition, which limits the working conditions; the crystal oscillator frequency accuracy of the existing acquisition station is limited, and the synchronization accuracy is not high. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a distributed hybrid networking microseismic signal acquisition method, system, medium and equipment.

[0005] 1) In a first aspect, the present invention provides a distributed hybrid networking microseismic signal acquisition method, comprising:

[0006] S1, based on the network relay equipment, build a local area network covering the host computer and at least one microseismic acquisition station;

[0007] S2, sending a collection instruction to the local area network, so that the microseismic collection station in the local area network can collect microseismic signals.

[0008] The beneficial effects of the present invention are as follows: by deploying network relay equipment and microseismic acquisition platforms in advance, basic equipment support is provided for the subsequent establishment of a local area network. In addition, the control of acquisition and the transmission of data within the local area network can not only effectively prevent external interference, but also further improve the efficiency of data transmission.

[0009] Based on the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the network relay device includes: a network center station, at least one directional antenna, at least one access point directional antenna and at least one network access point that are sequentially connected in communication, any directional antenna is connected to an access point directional antenna, and any network access point is respectively connected to at least one microseismic acquisition station. The process of building a local area network covering the host computer and at least one microseismic acquisition station is specifically as follows:

[0011] Adjust the directions of the directional antenna and the access point directional antenna so that the directional antenna and the access point directional antenna can communicate normally.

[0012] Furthermore, before building a local area network covering the host computer and at least one microseismic acquisition station, the following steps are also included:

[0013] All microseismic acquisition stations are automatically time synchronized through the frequency of the crystal oscillator in each microseismic acquisition station.

[0014] Furthermore, after constructing a local area network covering the host computer and at least one microseismic acquisition station, the following steps are further included:

[0015] Control the host computer to broadcast query messages to all microseismic acquisition stations in the local area network through the UDP protocol;

[0016] When the host computer receives the IP address information fed back by all microseismic acquisition stations;

[0017] Integrate all IP address information.

[0018] The beneficial effects of the above scheme are: the information of the microseismic acquisition station is automatically obtained by sending a query message through the host computer. Among them, the 5.8GHz wireless network has a fast data transmission speed and low frequency band occupancy, which can meet the high-speed data transmission requirements in complex environments; and the wired networking method provides a networking solution under extreme conditions. This networking method of arbitrary mixing of wired, wireless, and self-storage can effectively overcome the problem of networking in complex terrain, and can realize the networking of the acquisition system within the kilometer level and the real-time data transmission of the collected data.

[0019] Furthermore, the process of automatically performing time synchronization processing on the microseismic acquisition stations includes:

[0020] Calibrate the crystal oscillator in each microseismic acquisition station;

[0021] Calibration is completed by generating real time based on the crystal clock signal generated by the calibrated crystal and the GPS time.

[0022] The beneficial effects of the above scheme are as follows: the time synchronization method of the microseismic acquisition platform uses GPS second pulses to calibrate the crystal frequency of the microseismic acquisition station, thereby improving the synchronization accuracy; time synchronization can be completed by performing GPS synchronization once, and there is no need to maintain GPS signal connection during the acquisition process; a specific start acquisition process is used to enable all microseismic acquisition stations to start acquisition at the same time. The present invention can achieve high-precision synchronization of multiple acquisition stations in microseismic signal acquisition, and the synchronization accuracy can reach 100 nanoseconds. This level of accuracy can fully meet the requirements of microseismic monitoring and analysis for signal time accuracy. Whether it is data synchronization or event triggering between acquisition stations, a high degree of consistency can be maintained, thereby improving the accuracy and reliability of microseismic signal data.

[0023] Furthermore, the calibration of the crystal oscillator in each microseismic acquisition station specifically includes:

[0024] Determine the target frequency of the crystal oscillator, and determine the number M of rising edges of the clock signal of the crystal oscillator within N seconds through FPGA. When the difference between the product of the target frequency and N seconds and the number M of rising edges is greater than a first threshold, adjust the clock signal frequency of the crystal oscillator, and repeat the threshold comparison until the difference between the product of the target frequency and N seconds and the number M of rising edges is less than the first threshold.

[0025] Further, the process of completing the calibration by generating the real-time time based on the crystal oscillator clock signal generated by the calibrated crystal oscillator and the GPS time is as follows:

[0026] Receive GPS time information, start counting the rising edge of the crystal oscillator clock signal, and when the count value reaches the second threshold, add 1s to the GPS time information, generate a pulse signal, and clear the count value of the rising edge to complete the calibration.

[0027] 2) In a second aspect, the present invention further provides a distributed hybrid networking microseismic signal acquisition system, comprising:

[0028] The construction module is used to: construct a local area network covering the host computer and at least one microseismic acquisition station based on the network relay device;

[0029] The acquisition module is used to send acquisition instructions to the local area network, so that the microseismic acquisition stations in the local area network can collect microseismic signals.

[0030] The beneficial effects of the present invention are as follows: by deploying network relay equipment and microseismic acquisition platforms in advance, basic equipment support is provided for the subsequent establishment of a local area network. In addition, the control of acquisition and the transmission of data within the local area network can not only effectively prevent external interference, but also further improve the efficiency of data transmission.

[0031] Furthermore, the network relay device includes: a network center station, at least one directional antenna, at least one access point directional antenna and at least one network access point that are sequentially connected in communication, any directional antenna is connected to an access point directional antenna, and any network access point is respectively connected to at least one microseismic acquisition station. The process of building a local area network covering the host computer and at least one microseismic acquisition station is specifically as follows:

[0032] Adjust the directions of the directional antenna and the access point directional antenna so that the directional antenna and the access point directional antenna can communicate normally.

[0033] Furthermore, before building a local area network covering the host computer and at least one microseismic acquisition station, the following steps are also included:

[0034] All microseismic acquisition stations are automatically time synchronized through the frequency of the crystal oscillator in each microseismic acquisition station.

[0035] Furthermore, after constructing a local area network covering the host computer and at least one microseismic acquisition station, the following steps are further included:

[0036] Control the host computer to broadcast query messages to all microseismic acquisition stations in the local area network through the UDP protocol;

[0037] When the host computer receives the IP address information fed back by all microseismic acquisition stations;

[0038] Integrate all IP address information.

[0039] The beneficial effects of the above scheme are: the information of the microseismic acquisition station is automatically obtained by sending a query message through the host computer. Among them, the 5.8GHz wireless network has a fast data transmission speed and low frequency band occupancy, which can meet the high-speed data transmission requirements in complex environments; and the wired networking method provides a networking solution under extreme conditions. This networking method of arbitrary mixing of wired, wireless, and self-storage can effectively overcome the problem of networking in complex terrain, and can realize the networking of the acquisition system within the kilometer level and the real-time data transmission of the collected data.

[0040] Furthermore, the process of automatically performing time synchronization processing on the microseismic acquisition stations includes:

[0041] Calibrate the crystal oscillator in each microseismic acquisition station;

[0042] Calibration is completed by generating real time based on the crystal clock signal generated by the calibrated crystal and the GPS time.

[0043] The beneficial effects of the above scheme are as follows: the time synchronization method of the microseismic acquisition platform uses GPS second pulses to calibrate the crystal frequency of the microseismic acquisition station, thereby improving the synchronization accuracy; time synchronization can be completed by performing GPS synchronization once, and there is no need to maintain GPS signal connection during the acquisition process; a specific start acquisition process is used to enable all microseismic acquisition stations to start acquisition at the same time. The present invention can achieve high-precision synchronization of multiple acquisition stations in microseismic signal acquisition, and the synchronization accuracy can reach 100 nanoseconds. This level of accuracy can fully meet the requirements of microseismic monitoring and analysis for signal time accuracy. Whether it is data synchronization or event triggering between acquisition stations, a high degree of consistency can be maintained, thereby improving the accuracy and reliability of microseismic signal data.

[0044] Furthermore, the calibration of the crystal oscillator in each microseismic acquisition station specifically includes:

[0045] Determine the target frequency of the crystal oscillator, and determine the number M of rising edges of the clock signal of the crystal oscillator within N seconds through FPGA. When the difference between the product of the target frequency and N seconds and the number M of rising edges is greater than a first threshold, adjust the clock signal frequency of the crystal oscillator, and repeat the threshold comparison until the difference between the product of the target frequency and N seconds and the number M of rising edges is less than the first threshold.

[0046] Further, the process of completing the calibration by generating the real-time time based on the crystal oscillator clock signal generated by the calibrated crystal oscillator and the GPS time is as follows:

[0047] Receive GPS time information, start counting the rising edge of the crystal oscillator clock signal, and when the count value reaches the second threshold, add 1s to the GPS time information, generate a pulse signal, and clear the count value of the rising edge to complete the calibration.

[0048] 3) In a third aspect, the present invention further provides a computer device, comprising a processor, the processor being coupled to a memory, the memory storing at least one computer program, the at least one computer program being loaded and executed by the processor, so that the computer device implements a distributed hybrid networked microseismic signal acquisition method according to any one of the above claims.

[0049] The beneficial effects of the present invention are as follows: by deploying network relay equipment and microseismic acquisition platforms in advance, basic equipment support is provided for the subsequent establishment of a local area network. In addition, the control of acquisition and the transmission of data within the local area network can not only effectively prevent external interference, but also further improve the efficiency of data transmission.

[0050] 4) In a fourth aspect, the present invention further provides a computer-readable storage medium, in which at least one computer program is stored, and the at least one computer program is loaded and executed by a processor so that a computer implements a distributed hybrid network microseismic signal acquisition method according to any one of the above claims.

[0051] The beneficial effects of the present invention are as follows: by deploying network relay equipment and microseismic acquisition platforms in advance, basic equipment support is provided for the subsequent establishment of a local area network. In addition, the control of acquisition and the transmission of data within the local area network can not only effectively prevent external interference, but also further improve the efficiency of data transmission.

[0052] It should be noted that the beneficial effects achieved by the technical solutions of the second to fourth aspects of the present invention and the corresponding possible implementation methods can be found in the above-mentioned technical effects of the first aspect and its corresponding possible implementation methods, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram of a process flow provided for an embodiment of a distributed hybrid networking microseismic signal acquisition method of the present invention;

[0054] Figure 2 A structural framework diagram provided for an embodiment of a distributed hybrid networking microseismic signal acquisition system of the present invention;

[0055] Figure 3A schematic diagram of the structure of a microseismic acquisition platform provided for an embodiment of a distributed hybrid networked microseismic signal acquisition system of the present invention;

[0056] Figure 4 A schematic diagram of the structure of a microseismic acquisition station provided for an embodiment of a distributed hybrid networked microseismic signal acquisition system of the present invention;

[0057] Figure 5 A diagram showing the relationship between a microseismic acquisition station and a microseismic acquisition platform provided in an embodiment of a distributed hybrid networked microseismic signal acquisition system of the present invention;

[0058] Figure 6 A schematic diagram of the structure of a signal conditioning module provided for an embodiment of a distributed hybrid networking microseismic signal acquisition system of the present invention;

[0059] Figure 7 A microseismic acquisition platform networking process provided for an embodiment of a distributed hybrid networking microseismic signal acquisition system of the present invention;

[0060] Figure 8 A schematic diagram of a crystal oscillator calibration circuit structure provided for an embodiment of a distributed hybrid networked microseismic signal acquisition system of the present invention;

[0061] Fig. 9 A crystal oscillator calibration flow chart provided for an embodiment of a distributed hybrid networked microseismic signal acquisition system of the present invention;

[0062] Fig.10 A time synchronization flow chart provided for an embodiment of a distributed hybrid networking microseismic signal acquisition system of the present invention;

[0063] Fig.11 A flowchart of processing a start acquisition instruction by a microseismic acquisition station provided in an embodiment of a distributed hybrid network microseismic signal acquisition system of the present invention;

[0064] Fig.12 A collection platform workflow diagram provided for an embodiment of a distributed hybrid networking microseismic signal collection system of the present invention;

[0065] Fig.13 A schematic diagram of the structure of a computer device provided for an embodiment of a distributed hybrid networking microseismic signal acquisition system of the present invention. DETAILED DESCRIPTION

[0066] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0067] like Figure 1 As shown, a distributed hybrid networking microseismic signal acquisition method includes:

[0068] S1, based on the network relay equipment, build a local area network covering the host computer and at least one microseismic acquisition station;

[0069] S2, sending a collection instruction to the local area network, so that the microseismic collection station in the local area network can collect microseismic signals.

[0070] In some possible implementations, by deploying network relay equipment and microseismic acquisition platforms in advance, basic equipment support is provided for the subsequent establishment of a local area network. In addition, the control of acquisition and the transmission of data within the local area network can not only effectively prevent external interference, but also further improve the efficiency of data transmission.

[0071] S1, based on the network relay device, the specific process of building a local area network covering the host computer and at least one microseismic acquisition station is as follows:

[0072] The microseismic acquisition station converts the analog signals collected by the three-component microseismic geophone into digital signals and transmits the data back to the host computer through the local area network.

[0073] S11, deploying network relay equipment and microseismic acquisition platforms according to preset rules;

[0074] S12, determining the access quantity of the network access point in the network relay device;

[0075] S13, the number of access points is consistent with the number of microseismic acquisition stations connected to the network access point, and all microseismic acquisition stations are connected to the host computer through the access point directional antenna, directional antenna and network center station in turn to complete the construction of the local area network.

[0076] When the network relay equipment includes: a network central station, a directional antenna, and a network access point;

[0077] The preset rules can be: Figure 5 As shown in the figure, a network access point is connected to multiple nearby collection stations by wireless or wired means, and one network access point corresponds to one access point directional antenna. The network center station is connected to multiple nearby directional antennas by wired means, and the directional antennas correspond to the access point directional antennas one by one. Adjust the direction of the directional antennas so that each pair of directional antennas can communicate normally.

[0078] The multiple collection stations nearby refer to:

[0079] 1) By selecting all microseismic acquisition stations within a preset range as multiple acquisition stations of the attachment, the preset range can be manually defined;

[0080] 2) According to the attributes of the network access point, the farthest connection distance of the network access point is determined, scanning is performed according to the farthest connection distance, and all the scanned microseismic collection stations are used as multiple collection stations.

[0081] The criteria for normal communication can be:

[0082] 1) A first directional antenna in any pair of directional antennas transmits a signal at a preset frequency. If the other second directional antenna receives the transmitted signal at the frequency, it transmits a feedback signal at the frequency. When the first directional antenna receives the feedback signal, it proves that the pair of directional antennas are communicating normally;

[0083] 2) In any pair of directional antennas, the first directional antenna transmits a signal at a preset frequency, and the second directional antenna receives and analyzes the transmitted signal to obtain a resolution frequency. If the resolution frequency is consistent with the preset frequency, it is determined that the pair of directional antennas are communicating normally.

[0084] It should be noted that the determination of normal communication is not limited to the above two forms, and can be adaptively adjusted according to actual needs.

[0085] In another embodiment, S1 may further include:

[0086] S10, time synchronization processing is performed on each microseismic acquisition station, specifically:

[0087] S101, calibrating the crystal oscillator in each microseismic acquisition station;

[0088] The crystal oscillator is a constant temperature crystal oscillator or a voltage-controlled constant temperature crystal oscillator, which is the Chinese abbreviation of the constant temperature crystal oscillator, and the English abbreviation is OCXO (Oven Controlled Crystal Oscillator). The solution to the temperature stability of the constant temperature crystal oscillator adopts the constant temperature tank technology. The crystal is placed in the constant temperature tank, and the constant temperature working point is set to keep the tank at a constant temperature. It is not affected by the external temperature within a certain range, so as to achieve the effect of stabilizing the output frequency.

[0089] The calibration is completed by adjusting the clock signal frequency of the crystal oscillator through the voltage-controlled constant temperature crystal oscillator calibration circuit in the digital circuit module in the microseismic acquisition station;

[0090] The voltage-controlled constant temperature crystal oscillator calibration circuit includes FPGA, DAC and crystal oscillator;

[0091] Wherein FPGA is: field programmable gate array;

[0092] DAC stands for: Digital to Analog Converter.

[0093] The working principle of the voltage-controlled constant temperature crystal oscillator calibration circuit is:

[0094] After receiving the GPS signal, the GPS module generates a second pulse signal, which is input into the FPGA and used as the gate time. At the same time, the clock signal of the constant temperature crystal oscillator received by the FPGA is counted. The FPGA calculates the value and sends instructions to control the DAC to output voltages of different voltage values. This voltage can control the clock signal frequency generated by the voltage-controlled constant temperature crystal oscillator.

[0095] The GPS second pulse is a pulse signal output once per second by the communication module after receiving the GPS signal, and its rising edge indicates the moment of the whole second.

[0096] The specific calibration process is as follows:

[0097] S1011, setting the target frequency F of the crystal oscillator, where the target frequency of the crystal oscillator is the clock signal frequency;

[0098] S1012, counting the number of rising edges of the clock signal of the crystal oscillator during N GPS pulses through FPGA, M, and obtaining the target number of rising edges of the crystal oscillator during N GPS pulses (a pulse period can be understood as seconds, that is, N GPS pulses can be understood as N seconds) as N*F;

[0099] S1013, when the deviation between M and N*F does not exceed 2, it is determined that the clock signal frequency of the crystal oscillator has been calibrated to F, and the calibration is completed;

[0100] When the deviation between M and N*F exceeds 2, the frequency of the clock signal of the crystal oscillator is adjusted through the voltage-controlled constant temperature crystal oscillator calibration circuit, and S1012 is executed again until the deviation between M and N*F does not exceed 2.

[0101] S102, based on the calibrated crystal oscillator, combined with GPS time, time synchronization processing is performed. The specific process is as follows:

[0102] S1021, after completing the crystal oscillator calibration, based on the communication module in the microseismic acquisition station, receive GPS information, and parse the GPS information through the digital circuit module in the microseismic acquisition station to obtain time information; at the same time, count the rising edges of the clock signal of the crystal oscillator through the digital circuit module;

[0103] S1022, when the count value reaches F-1, the local time of the microseismic acquisition station is set to add 1 second to the GPS time (the time information in S1021). After the time is updated, the FPGA generates a pulse signal and controls the count value to be cleared;

[0104] S1023, continuously repeating S1022, so that the time acquired by the microseismic acquisition station every second is the current accurate time.

[0105] GPS information includes but is not limited to: location information, posture information, and time information.

[0106] In another embodiment, if Figure 7 As shown, after S12, it also includes:

[0107] S13, control the host computer and the microseismic acquisition station to start up;

[0108] S14, controlling the host computer to broadcast the query message to all microseismic acquisition stations in the local area network through the UDP protocol;

[0109] S15, when the host computer receives the IP address information fed back by all microseismic acquisition stations, it integrates all the IP address information;

[0110] There are several methods for determining whether all microseismic acquisition stations have provided feedback:

[0111] 1) Through the display screen, the indicator light corresponding to the microseismic acquisition station that received the feedback is always on. When the indicator lights of all microseismic acquisition stations are always on, it can be determined that all microseismic acquisition stations have provided feedback;

[0112] 2) By comparing the number of feedback signals with the number of all microseismic acquisition stations, it is determined whether all microseismic acquisition stations have provided feedback;

[0113] 3) The unique number of each microseismic collection station is recorded in a statistical table. The number in the feedback information is parsed and associated with the unique number of the microseismic collection station to determine whether the unique numbers of all microseismic collection stations have associated data, thereby determining whether all microseismic collection stations have provided feedback.

[0114] In the above multiple determination methods, when not all microseismic acquisition stations have provided feedback, S14 is repeated until all microseismic acquisition stations have provided feedback.

[0115] S16, the user selects the microseismic acquisition station to be connected, and the host computer uses the TCP protocol to connect to the microseismic acquisition station selected by the user to complete the networking.

[0116] The microseismic acquisition station and the host computer are connected to the same local area network, and instructions are issued and data are transmitted back based on the local area network.

[0117] S2, sending a collection instruction to the local area network, so that the microseismic collection station in the local area network collects microseismic signals. The process is:

[0118] S21, in any local area network, when the host computer sends a collection instruction to multiple microseismic collection stations, each microseismic collection station waits for the arrival of the next rising edge of the local second pulse, starts collecting at the moment of the arrival of the rising edge, and records the time when the collection starts. The above scheme achieves the effect of multiple microseismic collection stations starting collection at the same time;

[0119] S22, in any local area network, when the host computer sends an end command to multiple microseismic acquisition stations, each acquisition station stops acquisition within the local second pulse after receiving the end command, and records the time of stopping acquisition.

[0120] In another specific embodiment, Figure 4 As shown, the microseismic acquisition station includes a signal conditioning module, an analog-to-digital conversion module, an isolation module, a digital circuit module, and a communication module connected in sequence;

[0121] The isolation module is also connected to the signal conditioning module and the analog-to-digital conversion module;

[0122] like Figure 3 As shown, the sensor is connected to the signal conditioning module;

[0123] The communication module is connected to the network relay device and the host computer in sequence;

[0124] The microseismic acquisition station forms a microseismic acquisition platform through network relay equipment, and the microseismic acquisition platform is a distributed microseismic acquisition platform. The above content is the modules that need to be applied when collecting through the microseismic acquisition station.

[0125] 1. The sensor is a geophone located at the front end of the microseismic acquisition station, which converts seismic wave signals into electrical signals and transmits them to the signal conditioning module;

[0126] 2. Signal conditioning module such as Figure 6 As shown, it includes a protection circuit, an impedance matching circuit, a common mode filtering circuit, an amplifier circuit, and a single-ended to differential circuit connected in sequence; the amplifier circuit is connected to the isolation module and receives a control amplification factor signal;

[0127] The signal conditioning module is used to filter out the circuit noise in the electrical signal converted by the sensor and scale the amplitude of the signal to a size as close as possible to the measurement range of the analog-to-digital conversion module, so that the microseismic acquisition station can measure tiny signals.

[0128] 2.1 The function of the protection circuit is to limit the voltage of the input signal and prevent accidental input of signals with excessive voltage.

[0129] 2.2 Impedance matching circuit is used to match the output impedance of the sensor to obtain a larger input signal.

[0130] 2.3 Common-mode filter circuit is used to filter out common-mode interference in the signal.

[0131] 2.4 The amplifier circuit is used to amplify the signal during measurement. The amplifier circuit uses a programmable amplifier whose gain can be controlled by a digital signal. The amplification gain of the circuit can be flexibly controlled according to the actual size of the microseismic signal.

[0132] 2.5 The single-ended to differential circuit is used to convert the single-ended signal output by the amplifier circuit into a differential signal that can be received by the analog-to-digital converter.

[0133] 3. The analog-to-digital conversion module, which consists of an analog-to-digital converter and surrounding circuits, converts the conditioned analog signal into a digital signal that can be recognized by the computer.

[0134] Peripheral circuits refer to the chip's peripheral circuits, which are circuits composed of resistors, capacitors, and inductors, and serve to decouple and isolate the power supply.

[0135] 4. Isolation module, consisting of isolation devices and surrounding circuits;

[0136] The functions of this module are:

[0137] (1) Connecting the analog-to-digital conversion module and the digital circuit module to transmit signals;

[0138] (2) Microseismic signals have a short duration and a small amplitude. In addition, since 5.8 GHz wireless network and 100 Mbit / s wired network are used for data transmission, high-frequency digital signals will cause significant interference to analog signals, making them susceptible to noise interference from digital circuits. The isolation module performs electrical isolation between the digital circuit module and the analog-to-digital conversion module and signal conditioning module to prevent circuit noise in the digital circuit module from interfering with the conditioning and analog-to-digital conversion of analog signals, thereby improving acquisition accuracy.

[0139] 5. The digital circuit module consists of an FPGA (field programmable gate array), a CPU (central processing unit, based on ARM architecture), a voltage-controlled constant temperature crystal oscillator calibration circuit, and an SD card (secure digital card) interface circuit. Data is exchanged between the FPGA and the CPU through a parallel GPMC data bus.

[0140] The functions of this module are:

[0141] (1) Receive the digital seismic signal output by the analog-to-digital conversion module, analyze, convert the format, and store the digital signal;

[0142] (2) Sending control signals to the analog-to-digital conversion module and the signal conditioning module to set the sampling rate of the analog-to-digital conversion module and the signal amplification factor of the signal conditioning module to improve the acquisition accuracy and dynamic range;

[0143] (3) Communicate with the host computer based on 5.8 GHz or wired network through the communication module, receive control instructions from the host computer, and transmit the collection results of the microseismic collection station back;

[0144] (4) The GPS pulse-per-second signal output by the communication module is used to calibrate the voltage-controlled constant temperature crystal oscillator of the microseismic acquisition station and synchronize the time between the acquisition stations, thus realizing the function of high-precision synchronous acquisition of multiple microseismic acquisition stations.

[0145] 6. Communication module, divided into wired version and wireless version.

[0146] The communication module of the wired version establishes a network connection with other parts of the system through an aviation plug-type network port;

[0147] The wireless version of the communication module establishes a network connection with other parts of the system through a 5.8GHz communication antenna.

[0148] In addition, the communication module also includes a GPS (Global Positioning System) communication interface.

[0149] The functions of the communication module are:

[0150] (1) Establish a network connection between the digital circuit module and the host computer;

[0151] (2) Receive GPS signals and provide them to the digital circuit module for crystal oscillator calibration and time synchronization.

[0152] 7. Communication relay equipment includes network center station, directional antenna and network access point.

[0153] 7.1 The network access point is connected to the communication module of the microseismic acquisition station by wireless or wired means, and the network access point is connected to the directional antenna by wired means.

[0154] 7.2 The network center station is connected to a personal computer or smart phone (i.e., a host computer) by wired or wireless means. The network center station is connected to multiple nearby directional antennas by wired connection, and these directional antennas respectively communicate wirelessly with the access point directional antennas near the network access point.

[0155] It should be noted that a pair of directional antennas can carry out long-distance wireless communication transmission, thereby realizing the networking of data collection systems with a kilometer-level range.

[0156] In addition, the host computer can be a personal computer or a smart phone, and its role is human-computer interaction:

[0157] (1) The host computer can send the operator's instructions to the digital circuit module to control the sampling rate of the microseismic acquisition station, the amplification factor of the signal conditioning circuit, the start and stop of acquisition;

[0158] (2) The host computer can receive status information such as battery power and power consumption returned by the digital circuit module;

[0159] (3) The host computer can receive the measurement results returned by the digital circuit module and display the measurement results in the form of charts.

[0160] The time synchronization method of the microseismic acquisition system is:

[0161] The time synchronization of the microseismic acquisition system first requires the calibration of the crystal oscillator to obtain a crystal oscillator clock signal with an accurate frequency, and then generate real-time time based on GPS time.

[0162] The friendly effect of using the crystal oscillator clock signal to generate real-time time is:

[0163] (1) The minimum time interval of GPS time is "seconds", and a crystal oscillator clock signal is needed to generate more accurate "milliseconds" and "microseconds" time;

[0164] (2) GPS time may have unexpected conditions such as poor signal. In this case, the accurate time can be obtained based on the crystal oscillator clock signal. That is, after completing one time synchronization, the microseismic acquisition system can work without GPS signal.

[0165] The structure of the voltage-controlled constant temperature crystal oscillator calibration circuit is as follows: Figure 8 As shown, this part of the circuit is part of the digital circuit module, including FPGA (field programmable gate array), DAC (digital analog converter), crystal oscillator, wherein FPGA can receive the clock signal of the crystal oscillator and count the clock signal, FPGA can receive GPS second pulse, FPGA can control DAC to output voltages of different voltage values, and the voltage output by DAC can control the frequency of the crystal oscillator clock signal. GPS second pulse is a pulse signal output once per second after the communication module receives the GPS signal, and its rising edge indicates the moment of the whole second.

[0166] The crystal calibration process is as follows: Fig. 9 As shown in the figure, the target frequency of the crystal oscillator is F (i.e., the frequency of the crystal oscillator after calibration). The number of rising edges of the crystal oscillator clock signal during N GPS second pulses (i.e., within N seconds) counted by FPGA is M. It can be seen that the target number of rising edges of the crystal oscillator within N seconds should be N*F. If the deviation between M and N*F does not exceed 2, it is considered that the frequency of the crystal oscillator has been calibrated to F, and the calibration process is completed. If the deviation between M and N*F exceeds 2, the FPGA adjusts the DAC output according to the deviation value and then adjusts the frequency of the crystal oscillator clock signal. After adjustment, it counts again and determines whether the crystal oscillator has completed calibration.

[0167] The time synchronization process is as follows Fig.10As shown. After the crystal oscillator calibration is completed, the digital circuit module in the microseismic acquisition station receives GPS information through the communication module and analyzes the received time. At the same time, the digital circuit module starts counting the rising edge of the crystal oscillator clock signal. When the count value reaches F-1 (F is the frequency value after the crystal oscillator calibration), the time is added by 1 second on the basis of the GPS time, and a pulse signal is generated (a local second pulse signal with a period of 1 second, which can continue to be generated without a GPS signal). At the same time, the count value is reset to zero, and the count is restarted. The count is continuously cycled, so that the microseismic acquisition station can obtain the current accurate time every second.

[0168] like Fig.11 As shown in the figure, when the host computer sends a command to start acquisition to multiple microseismic acquisition stations, each acquisition station will wait for the next rising edge of the local second pulse, start acquisition at the moment of the rising edge (i.e., the whole second), and record the time when acquisition starts. Multiple microseismic acquisition stations can start acquisition at the same time.

[0169] The workflow of the microseismic acquisition system is as follows:

[0170] The workflow of the microseismic acquisition system is as follows: Fig.12 As shown:

[0171] (1) Each microseismic acquisition station automatically performs time synchronization after startup, calibrates the crystal oscillator frequency through GPS and obtains accurate time;

[0172] (2) Then the microseismic acquisition system is networked. One or more microseismic acquisition stations and the host computer form a local area network through a network relay device. The host computer is connected to each microseismic acquisition station through the local area network to complete the networking.

[0173] (3) After the networking is completed, the host computer software can issue acquisition instructions to one or more microseismic acquisition stations;

[0174] (4) The microseismic acquisition stations that receive the acquisition instruction will start acquisition at the same time to achieve the effect of synchronous acquisition of the microseismic acquisition system. During the acquisition process, the host computer can receive the acquisition data returned by the microseismic acquisition station in real time and view the data waveform;

[0175] (5) After a certain period of time, the host computer sends an end command to the microseismic acquisition station, and the microseismic acquisition station stops collecting data;

[0176] (6) The collected microseismic data will be saved and backed up locally at each acquisition station. After the acquisition is completed, the host computer can access the microseismic acquisition station through the local area network to retrieve the complete data collected this time.

[0177] Preferably, in any of the above embodiments, the network relay device comprises: a network central station, at least one directional antenna, at least one access point directional antenna and at least one network access point which are sequentially communicatively connected, any directional antenna is connected to an access point directional antenna, any network access point is respectively connected to at least one microseismic acquisition station, and the process of constructing a local area network covering the host computer and at least one microseismic acquisition station is specifically as follows:

[0178] Adjust the directions of the directional antenna and the access point directional antenna so that the directional antenna and the access point directional antenna can communicate normally.

[0179] Preferably, in any of the above embodiments, before building a local area network covering the host computer and at least one microseismic acquisition station, the method further includes:

[0180] All microseismic acquisition stations are automatically time synchronized through the frequency of the crystal oscillator in each microseismic acquisition station.

[0181] Preferably, in any of the above embodiments, after building a local area network covering the host computer and at least one microseismic acquisition station, the method further includes:

[0182] Control the host computer to broadcast query messages to all microseismic acquisition stations in the local area network through the UDP protocol;

[0183] When the host computer receives the IP address information fed back by all microseismic acquisition stations;

[0184] Integrate all IP address information.

[0185] In some possible implementations, the information of the microseismic acquisition station is automatically obtained by sending a query message through the host computer. Among them, the 5.8GHz wireless network has a fast data transmission speed and low frequency band occupancy, which can meet the high-speed data transmission requirements in complex environments; and the wired networking method provides a networking solution under extreme conditions. This networking method of arbitrary mixing of wired, wireless, and self-storage can effectively overcome the problem of networking in complex terrain, and can realize the networking of the acquisition system within a kilometer range and the real-time data transmission of the collected data.

[0186] Preferably, in any of the above embodiments, the process of automatically performing time synchronization processing on the microseismic acquisition station includes:

[0187] Calibrate the crystal oscillator in each microseismic acquisition station;

[0188] Calibration is completed by generating real time based on the crystal clock signal generated by the calibrated crystal and the GPS time.

[0189] In some possible implementations, the time synchronization method of the microseismic acquisition platform uses GPS second pulses to calibrate the crystal frequency of the microseismic acquisition station, thereby improving the synchronization accuracy; time synchronization can be completed by performing GPS synchronization once, and there is no need to maintain GPS signal connection during the acquisition process; a specific start acquisition process is used to enable all microseismic acquisition stations to start acquisition at the same time. The present invention can achieve high-precision synchronization of multiple acquisition stations in microseismic signal acquisition, and the synchronization accuracy can reach 100 nanoseconds. This level of accuracy can fully meet the requirements of microseismic monitoring and analysis for signal time accuracy. Whether it is data synchronization or event triggering between acquisition stations, a high degree of consistency can be maintained, thereby improving the accuracy and reliability of microseismic signal data.

[0190] Preferably, in any of the above embodiments, calibrating the crystal oscillator in each microseismic acquisition station specifically includes:

[0191] Determine the target frequency of the crystal oscillator, and determine the number M of rising edges of the clock signal of the crystal oscillator within N seconds through FPGA. When the difference between the product of the target frequency and N seconds and the number M of rising edges is greater than a first threshold, adjust the clock signal frequency of the crystal oscillator, and repeat the threshold comparison until the difference between the product of the target frequency and N seconds and the number M of rising edges is less than the first threshold.

[0192] Preferably, in any of the above embodiments, the process of completing the calibration by generating the real-time time based on the crystal oscillator clock signal generated by the calibrated crystal oscillator and the GPS time is:

[0193] Receive GPS time information, start counting the rising edge of the crystal oscillator clock signal, and when the count value reaches the second threshold, add 1s to the GPS time information, generate a pulse signal, and clear the count value of the rising edge to complete the calibration.

[0194] like Figure 2 As shown, a distributed hybrid networked microseismic signal acquisition system comprises:

[0195] The construction module 100 is used to: construct a local area network covering a host computer and at least one microseismic acquisition station based on a network relay device;

[0196] The acquisition module 200 is used to send an acquisition instruction to the local area network, so that the microseismic acquisition stations in the local area network can acquire microseismic signals.

[0197] In some possible implementations, by deploying network relay equipment and microseismic acquisition platforms in advance, basic equipment support is provided for the subsequent establishment of a local area network. In addition, the control of acquisition and the transmission of data within the local area network can not only effectively prevent external interference, but also further improve the efficiency of data transmission.

[0198] Preferably, in any of the above embodiments, the network relay device includes: a network central station, at least one network access point and at least one directional antenna, and the process of deploying the network relay device and the microseismic acquisition platform is specifically as follows:

[0199] The directions of the directional antennas are adjusted so that any pair of directional antennas can communicate normally, any network connection point is connected to at least one microseismic acquisition station by wire or wireless means, and the network center station is connected to at least one directional antenna by wire.

[0200] Preferably, in any of the above embodiments, before building a local area network between any one or more microseismic acquisition stations and a host computer, the method further includes:

[0201] The microseismic acquisition stations are automatically time synchronized by the frequency of the crystal oscillator in each microseismic acquisition station.

[0202] Preferably, in any of the above embodiments, after building a local area network between any one or more microseismic acquisition stations and a host computer, the following steps are further included:

[0203] Control the host computer to broadcast query messages to all microseismic acquisition stations in the local area network through the UDP protocol;

[0204] When the host computer receives the IP address information fed back by all microseismic acquisition stations;

[0205] Integrate all IP address information.

[0206] In some possible implementations, the information of the microseismic acquisition station is automatically obtained by sending a query message through the host computer. Among them, the 5.8GHz wireless network has a fast data transmission speed and low frequency band occupancy, which can meet the high-speed data transmission requirements in complex environments; and the wired networking method provides a networking solution under extreme conditions. This networking method of arbitrary mixing of wired, wireless, and self-storage can effectively overcome the problem of networking in complex terrain, and can realize the networking of the acquisition system within a kilometer range and the real-time data transmission of the collected data.

[0207] Preferably, in any of the above embodiments, the process of automatically performing time synchronization processing on the microseismic acquisition station includes:

[0208] Calibrate the crystal oscillator in each microseismic acquisition station;

[0209] Calibration is completed by generating real time based on the crystal clock signal generated by the calibrated crystal and the GPS time.

[0210] In some possible implementations, the time synchronization method of the microseismic acquisition platform uses GPS second pulses to calibrate the crystal frequency of the microseismic acquisition station, thereby improving the synchronization accuracy; time synchronization can be completed by performing GPS synchronization once, and there is no need to maintain GPS signal connection during the acquisition process; a specific start acquisition process is used to enable all microseismic acquisition stations to start acquisition at the same time. The present invention can achieve high-precision synchronization of multiple acquisition stations in microseismic signal acquisition, and the synchronization accuracy can reach 100 nanoseconds. This level of accuracy can fully meet the requirements of microseismic monitoring and analysis for signal time accuracy. Whether it is data synchronization or event triggering between acquisition stations, a high degree of consistency can be maintained, thereby improving the accuracy and reliability of microseismic signal data.

[0211] Preferably, in any of the above embodiments, calibrating the crystal oscillator in each microseismic acquisition station specifically includes:

[0212] Determine the target frequency of the crystal oscillator, and determine the number M of rising edges of the clock signal of the crystal oscillator within N seconds through FPGA. When the difference between the product of the target frequency and N seconds and the number M of rising edges is greater than a first threshold, adjust the clock signal frequency of the crystal oscillator, and repeat the threshold comparison until the difference between the product of the target frequency and N seconds and the number M of rising edges is less than the first threshold.

[0213] Preferably, in any of the above embodiments, the process of completing the calibration by generating the real-time time based on the crystal oscillator clock signal generated by the calibrated crystal oscillator and the GPS time is:

[0214] Receive GPS time information, start counting the rising edge of the crystal oscillator clock signal, and when the count value reaches the second threshold, add 1s to the GPS time information, generate a pulse signal, and clear the count value of the rising edge to complete the calibration.

[0215] like Fig.13 As shown, a computer device 300 according to an embodiment of the present invention includes a processor 320, the processor 320 is coupled to a memory 310, and the memory 310 stores at least one computer program 330, and the at least one computer program 330 is loaded and executed by the processor 320, so that the computer device 300 implements a distributed hybrid network microseismic signal acquisition method according to any one of the above claims, specifically:

[0216] The computer device 300 may have relatively large differences due to different configurations or performances, and may include one or more processors 320 (Central Processing Units, CPU) and one or more memories 310, wherein at least one computer program 330 is stored in the one or more memories 310, and the at least one computer program 330 is loaded and executed by the one or more processors 320, so that the computer device 300 implements a method for screening desert plants provided in the above embodiment. Of course, the computer device 300 may also have components such as a wired or wireless network interface, a keyboard, and an input and output interface for input and output, and the computer device 300 may also include other components for realizing the functions of the device, which will not be repeated here.

[0217] A computer-readable storage medium in an embodiment of the present invention stores at least one computer program, and the at least one computer program is loaded and executed by a processor so that a computer implements a distributed hybrid network microseismic signal acquisition method according to any one of the above claims.

[0218] Optionally, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, and the like.

[0219] In an exemplary embodiment, a computer program product or a computer program is also provided, the computer program product or the computer program comprising computer instructions, the computer instructions being stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs any of the above-mentioned methods for screening desert plants.

[0220] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects and represent the definition of a specific order or sequence. The order of use of similar objects can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than the order shown or described.

[0221] Those skilled in the art know that the present invention can be implemented as a system, method or computer program product. Therefore, the present disclosure can be specifically implemented in the following forms, namely: it can be complete hardware, it can be complete software (including firmware, resident software, microcode, etc.), or it can be a combination of hardware and software, which is generally referred to as "circuit", "module" or "system" herein. In addition, in some embodiments, the present invention can also be implemented in the form of a computer program product in one or more computer-readable media, and the computer-readable medium contains computer-readable program code.

[0222] Any combination of one or more computer-readable media may be used. A computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, device, or device.

[0223] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A distributed hybrid networking microseismic signal acquisition method, characterized in that: include: S1, based on the network relay equipment, build a local area network covering the host computer and at least one microseismic acquisition station; S2, sending a collection instruction to the local area network, so that the microseismic collection station in the local area network can collect microseismic signals.

2. The distributed hybrid networking microseismic signal acquisition method according to claim 1, characterized in that: The network relay device includes: a network center station, at least one directional antenna, at least one access point directional antenna and at least one network access point that are sequentially connected in communication, any directional antenna is connected to an access point directional antenna, and any network access point is connected to at least one microseismic acquisition station respectively. The process of building a local area network covering the host computer and at least one microseismic acquisition station is specifically as follows: Adjust the directions of the directional antenna and the access point directional antenna so that the directional antenna and the access point directional antenna can communicate normally.

3. The distributed hybrid networking microseismic signal acquisition method according to claim 1, characterized in that: Before building a local area network covering the host computer and at least one microseismic acquisition station, the following steps are also required: All microseismic acquisition stations are automatically time synchronized through the frequency of the crystal oscillator in each microseismic acquisition station.

4. The distributed hybrid networking microseismic signal acquisition method according to claim 1, characterized in that: After building a local area network covering the host computer and at least one microseismic acquisition station, it also includes: Control the host computer to broadcast query messages to all microseismic acquisition stations in the local area network through the UDP protocol; When the host computer receives the IP address information fed back by all microseismic acquisition stations; Integrate all IP address information.

5. The distributed hybrid networking microseismic signal acquisition method according to claim 3 is characterized in that: The process of automatically performing time synchronization processing on microseismic acquisition stations includes: Calibrate the crystal oscillator in each microseismic acquisition station; Calibration is completed by generating real time based on the crystal clock signal generated by the calibrated crystal and the GPS time.

6. A distributed hybrid networking microseismic signal acquisition method according to claim 5, characterized in that: The calibration of the crystal oscillator in each microseismic acquisition station specifically includes: Determine the target frequency of the crystal oscillator, and determine the number M of rising edges of the clock signal of the crystal oscillator within N seconds through FPGA. When the difference between the product of the target frequency and N seconds and the number M of rising edges is greater than a first threshold, adjust the clock signal frequency of the crystal oscillator, and repeat the threshold comparison until the difference between the product of the target frequency and N seconds and the number M of rising edges is less than the first threshold.

7. The distributed hybrid networking microseismic signal acquisition method according to claim 5, characterized in that: The process of completing the calibration based on the crystal oscillator clock signal generated by the calibrated crystal oscillator and the real-time time generated by GPS time is as follows: Receive GPS time information, start counting the rising edge of the crystal oscillator clock signal, and when the count value reaches the second threshold, add 1s to the GPS time information, generate a pulse signal, and clear the count value of the rising edge to complete the calibration.

8. A distributed hybrid networking microseismic signal acquisition system, characterized in that: include: The construction module is used to: construct a local area network covering the host computer and at least one microseismic acquisition station based on the network relay device; The acquisition module is used to send acquisition instructions to the local area network, so that the microseismic acquisition stations in the local area network can collect microseismic signals.

9. A computer device, characterized in that: The computer device includes a processor, the processor is coupled to a memory, at least one computer program is stored in the memory, and the at least one computer program is loaded and executed by the processor so that the computer device implements a distributed hybrid networking microseismic signal acquisition method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one computer program, and the at least one computer program is loaded and executed by the processor so that the computer implements the distributed hybrid networking microseismic signal acquisition method as claimed in any one of claims 1 to 7.

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