CN112785828A - Seismic exploration system and method with wireless communication and wired network mixed - Google Patents
Seismic exploration system and method with wireless communication and wired network mixed Download PDFInfo
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Abstract
The invention discloses a seismic exploration system and a method with a mixture of wireless communication and a wired network, wherein the system comprises a system control instrument vehicle and a plurality of independently arranged exploration units, and the exploration units are connected with the system control instrument vehicle through wireless communication; the system control instrument vehicle is used for sending instructions to the exploration unit and then receiving the acquired data of the exploration unit; the exploration unit comprises an acquisition station, a power supply station connected with the acquisition station through a wired network and a wireless transceiving node connected with the power supply station through the wired network, wherein the acquisition station is used for acquiring artificial seismic signals; the power supply station is used for supplying power to the acquisition station, sending instructions and collecting the state and data of the acquisition station; and the wireless transceiving node is used for transmitting instructions between the power supply station and the system control instrument vehicle. The invention has the advantages of high band-pass capability of wired transmission and uniform power supply, and can expand the networking capability of the system by utilizing the high-speed data transmission performance of wireless communication.
Description
Technical Field
The invention relates to the field of hybrid distributed seismic exploration and acquisition systems, in particular to a seismic exploration system and a seismic exploration method with hybrid wireless communication and wired network.
Background
At present, a large-scale seismic exploration system mainly adopts a distributed acquisition scheme, and high-density acquisition is realized by simultaneously working a large number of acquisition stations. With the development of science and technology, in recent years, a million cable distributed seismic exploration system mainly comprises an acquisition station, a power supply station, a cross station and a master control instrument vehicle, wherein the connection between the acquisition station and the power supply station adopts a customized or standard network transmission protocol with the speed of about several million to several hundred million bps; the transmission rate between the cross stations and the master instrument vehicle can reach gigabps, and optical fibers are generally used for connection. When the system reaches millions of channels, the connection length between the cross stations is at least a distance of several kilometers, and the long-distance optical fibers increase the difficulty of field construction and wiring.
Some large distributed seismic acquisition systems with a mixture of wireless and cable are also available in the prior art, but the acquisition stations are mainly wireless, that is, the acquisition stations are assembled with wireless transceiver modules. Although the construction of the acquisition station can be more flexible by the mode, the bandwidth requirement of the whole system is high by a large number of wireless acquisition stations, and the lane capability of the wireless acquisition stations is far lower than that of a wired system. In addition, because each acquisition station is independent, an independent power supply needs to be provided for each acquisition station, so that the number of a large number of batteries is increased, and great challenges are brought to power supply charging and management.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a seismic exploration system and a method with a mixed wireless communication and wired network, which not only have the advantages of high channel carrying capacity and uniform power supply of wired transmission, but also can expand the networking capacity of the system by utilizing the high-speed data transmission performance of wireless communication.
In order to solve the technical problem, the invention provides a seismic exploration system with a mixture of wireless communication and wired network, which comprises a system control instrument vehicle and a plurality of independently arranged exploration units, wherein the exploration units are connected with the system control instrument vehicle through wireless communication; the system control instrument vehicle is used for sending instructions to the exploration unit and then receiving the acquired data of the exploration unit;
the exploration unit comprises an acquisition station, a power supply station connected with the acquisition station through a wired network and a wireless transceiving node connected with the power supply station through the wired network, wherein the acquisition station is used for acquiring artificial seismic signals; the power supply station is used for supplying power to the acquisition station, sending instructions and collecting the state and data of the acquisition station; and the wireless transceiving node is used for transmitting instructions between the power supply station and the system control instrument vehicle.
Furthermore, a plurality of the acquisition stations form an acquisition chain in a wired cascade mode, and each power supply station is connected with the plurality of the acquisition chains through a wired network; preferably, the distances between the acquisition stations on the acquisition chains are the same; the distance between the power supply station and the first acquisition station on the acquisition chain under the power supply station is the same as the distance between the acquisition stations on the acquisition chain.
Furthermore, a plurality of power supply stations form a power supply chain in a wired cascading mode, and each wireless transceiving node is connected with one power supply chain through a wired network; preferably, the power stations on the power supply chain are at the same distance from each other, and the distance between the transceiver node and the first power station on the subordinate power supply chain is the same as the distance between the power stations on the power supply chain.
Furthermore, both ends of the power supply chain are connected with the wireless transceiving nodes.
Further, the wireless transceiving node comprises a GPS receiving module for synchronizing the wireless transceiving node; after the GPS receiving module receives the instruction, the wireless transceiving node sends a time synchronization instruction to the power supply stations connected with the wireless transceiving node, and each power supply station and the collecting station compensate according to a delay value so as to synchronize the exploration unit.
Further, the wired networks are all ring network topologies.
It is also an object of the present invention to provide a method of using a hybrid wireless communication and wired network seismic exploration system as claimed in any of claims 1 to 6, comprising the steps of:
s1, the system control instrument vehicle sends a data recovery instruction to the wireless transceiving node through wireless communication;
s2, the wireless transceiving node transmits the data recovery instruction to the power station through the wired network so as to collect the state and data of the acquisition station;
s3, after the acquisition station receives the data recovery instruction through the wired network, the acquisition station forwards the data recovery instruction to the power station, and the data recovery instruction is considered to be received by the acquisition station at the moment; meanwhile, the acquisition station analyzes and executes the data recovery instruction;
s4, the data is transmitted to the power station by the acquisition station through the wired network;
s5, the power station transmits the state and data of the acquisition station to the wireless transceiving node through the wired network;
s6, the wireless transceiving node transmits data to the system control instrument vehicle through wireless communication;
s7, the system control instrument vehicle sends a control instruction to the wireless transceiving node through wireless communication;
s8, the wireless transceiving node transmits the control instruction to the power station through the wired network;
s9, after the acquisition station receives the control instruction through the wired network, the acquisition station forwards the control instruction to the power supply station, and the control instruction is considered to be received by the acquisition station at the moment; and meanwhile, the acquisition station analyzes and executes the control command.
Further, when the power supply station is connected to the plurality of acquisition chains through the wired network, the step S3 includes the steps of:
s31, after receiving the data recovery command, the power station sends the data recovery command to the collection stations connected with the power station one by one;
s32, transmitting the data recovery command to a power supply station after the data recovery command is transmitted through a wired network of an acquisition chain;
s33, when executing S32 step, the first collecting station transmits data to the power station, and the power station takes the data received by the first collecting station as the last frame of the data frame; the first acquisition station is an acquisition station which is directly connected with the power supply station in an acquisition chain;
s34, the acquisition station behind the first acquisition station transmits the data to the first acquisition station;
s35, the first acquisition station transmits the data to the power station through the wired network;
and S36, repeating the steps S34-S35 until the data of all the acquisition stations in the acquisition chain are received.
Further, the method also comprises the following steps:
t1, the system control instrument vehicle sends a time synchronization instruction to the wireless transceiving node through wireless communication;
t2, the wireless transceiving node sends the time synchronization command to the power supply chain, and the time delay of the power supply station receiving the time synchronization command in the power supply chain is fixed to be equal to N (delta T)line+Δtdevice) Where N is the number of power stations between the power station receiving the data and the transceiving node, Δ tlineFixed delay for cable transmission of wired networks, Δ tdeviceThe delay of internal transfer of each stage of station can be ensured to be fixed for instruction receiving, analysis and forwarding;
t3, setting the time T + delta T in the synchronous command as the time of the power station by the power station;
after the clocks of all power supply stations on the power supply chain are synchronized, the power supply station sends a time synchronization instruction to an acquisition station on a subordinate acquisition chain, wherein the time of the acquisition station is T + delta T, and the delta T is n (delta T)line+Δtdevice) Where n is the number of acquisition stations between the acquisition station receiving the data and the power station, Δ tlineFor wired networksIs fixed, Δ t, of the cable transmissiondeviceThe delay of internal transfer of each stage of site can be ensured to be fixed for instruction receiving, analysis and forwarding.
Furthermore, the power station receives the time delay fixation of the time synchronization command by delta tdeviceIs a fixed value; delta t in delay fixation of receiving time synchronization command by acquisition stationdeviceIs a fixed value.
The invention has the beneficial effects that:
the wired distributed network structure in the prior art is divided again, the acquisition station, the power supply station and the receiving and transmitting node form a modular exploration unit, the exploration unit can be taken as an integral structural unit by the large-scale seismic exploration system, and the exploration units can be continuously copied to form an ultra-large seismic exploration system network due to the mutual independence of the exploration units;
the exploration units are connected with the system control instrument vehicle through wireless communication, so that the independence among the exploration units is ensured, the optical fiber connection among cross stations in the original wired distributed exploration system can be omitted, the service deployment difficulty of the system is reduced, the reliability is improved, the topological structure of the system is simplified, and the system can be expanded more easily;
compared with the prior art, the method not only retains the advantages of high lane capability and uniform power supply of wired transmission, but also provides a high-precision time synchronization mode of the acquisition station; and high-speed data transmission can be carried out by utilizing wireless communication, cross station nodes and optical fiber equipment are replaced, and the networking capability of the system is greatly expanded.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a transmission topology inside a survey unit of the present invention.
The reference numbers in the figures illustrate: 10. the system controls the instrument vehicle; 20. an exploration unit; 201. a collection station; 202. a power supply station; 203. a wireless transceiving node.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1 and 2, an embodiment of a seismic survey system with a combination of wireless communication and wired network according to the present invention includes a system control instrument cart 10 and a plurality of independently installed survey units 20, wherein the survey units 20 are connected to the system control instrument cart 10 through wireless communication. The system control instrument vehicle 10 is used for sending instructions and receiving the collected data of the exploration unit 20, is a main control center of the whole system, sends system control instructions through an interactive interface, and simultaneously receives the collected data sent by the wireless transceiving node 203 through wireless communication, wherein the wireless communication is preferably 5G wireless communication in the embodiment.
The exploration unit 20 comprises an acquisition station 201, a power supply station 202 and a wireless transceiving node 203 which are connected through a wired network, wherein the acquisition station 201 is used for acquiring artificial seismic signals; the power supply station 202 is configured to supply power to the acquisition station 201, send an instruction, and collect the state and data of the acquisition station 201; the wireless transceiving node 203 is used for transmitting commands between the power supply station 202 and the system control instrument truck 10, is directly connected with the power supply station 202, transmits the commands transmitted by the system control instrument truck 10 to the power supply station 202, and transmits data received by the power supply station 202 to the system control instrument truck 10 through wireless communication. The transceiver nodes are independent from each other and do not need to be connected, and the transceiver nodes are connected with the system control instrument vehicle 10 through wireless communication. The whole system is divided into transmitting and receiving nodes, each transmitting and receiving node and all stations on a power supply chain and an acquisition chain under the transmitting and receiving node form an exploration unit 20, each exploration unit 20 is independent, and a plurality of exploration units 20 jointly form the whole large-scale seismic exploration system. The whole system consists of a plurality of mutually independent exploration units 20 and a system control instrument vehicle 10, each exploration unit 20 has the same structure, and when the system needs to be expanded, one exploration unit 20 is expanded.
The seismic exploration system in the embodiment uses wired network connection inside the exploration unit 20, thereby retaining the advantages of wires and ensuring high-band capacity and efficient power management capacity of the whole system. Meanwhile, the data transmission between the exploration unit 20 and the system control instrument vehicle 10 is carried out through wireless communication, the requirement of high-speed transmission between cross station optical fibers in the prior art is met through the wireless communication, and the data transmission higher than 1Gbps can be realized through the transmission technology of 5G in the embodiment. Moreover, the transmission mode of wireless communication is used, and the cross stations do not need to be interconnected, and each cross station can directly transmit data and instructions with the system control instrument vehicle 10 through wireless communication connection. Therefore, the optical fiber in the prior art can be omitted, the topological structure of the whole system is simplified, and the seismic exploration system in the embodiment is very easy to expand the system, so that a large seismic acquisition system with millions of channels of acquisition is realized.
The topology structures of the exploration units 20 divided by the receiving and transmitting nodes of the whole seismic exploration system are the same and are mutually independent, the system control instrument vehicle 10 only directly carries out direct wireless communication with the receiving and transmitting nodes of each exploration unit, and the system control instrument vehicle does not need to directly communicate with the power supply station 202 and the acquisition station 201 in each exploration unit 20, so that the performance requirement and the complexity of the system control instrument vehicle 10 are reduced. Meanwhile, the system control instrument vehicle 10 is directly communicated with the transceiver nodes of each exploration unit 20 of the whole system through the transceiver module, so that the transceiver nodes of each exploration unit 20 are not required to be connected and communicated, the topological structure of the system is simplified, and the expansion of the whole system is facilitated.
Compared with the prior art, the embodiment not only retains the advantages of high band-pass capability and uniform power supply of wired transmission, but also provides a high-precision time synchronization mode of the acquisition station 201; and high-speed data transmission can be carried out by utilizing wireless communication such as 5G and the like, cross station nodes and optical fiber equipment are replaced, and the networking capability of the system is greatly expanded.
In one embodiment of the present invention, the system control instrument cart 10 is configured similar to a conventional instrument cart, including a system control host (containing control and processing software), a high speed data forwarding module, and a transceiver module. The system control host is mainly responsible for data storage, processing, instruction generation and sending, and provides a user interface for user operation. The high-speed data forwarding module is an independent high-speed data interface and can be realized by PCI (peripheral component interconnect), and a large amount of received data is quickly transmitted to the control host. The transceiver module is the same as the wireless data transmission module in the transceiver node, and since the amount of data transmitted to the system control instrument cart 10 by the transceiver node is large and the amount of command data transmitted by the system control instrument cart 10 is small, the system control instrument cart 10 can be used as a data downlink node.
The acquisition stations 201 are connected with the acquisition stations 201 through a wired network, a plurality of acquisition stations 201 form an acquisition chain in a wired cascade mode, the acquisition chain is connected with a superior power station 202 through the wired network mode, each power station 202 is connected with a plurality of acquisition chains through the wired network, and each power station 202 can be provided with a plurality of acquisition chains. The power station 202 supplies power to each acquisition chain at the same time as data transmission, and the power station 202 needs to be provided with a separate battery. The power station 202 is responsible for sending a control instruction to a subordinate acquisition chain and collecting the state and the acquired data of each acquisition station 201 on the subordinate acquisition chain. Each power station 202 may carry multiple acquisition chains, which may increase the lane capability of the system. The power supply for the acquisition chain is directly supplied by the power station 202 using the cable for data transmission of the wired network, so that no separate battery is required for the acquisition chain. In this embodiment, each power supply station 202 has 4 acquisition chains, and 150 acquisition stations 201 can be connected in each acquisition chain, so that one power supply station 202 can have 600 acquisition stations 201. Preferably, the acquisition stations 201 use digital acquisition stations 201, and each acquisition station 201 is composed of a digital geophone for acquiring seismic signals of an artificial earthquake. The device mainly comprises a wave detector, a pre-amplification filter circuit, an ADC circuit, an FPGA, a POE power supply module and a data transmission and instruction transmission part. The geophone converts seismic wave signals into electric signals, the signals are conditioned by the preamplification filter circuit and then are acquired and converted into digital signals by the FPGA control ADC, the signals are processed by the FPGA and then are transmitted to the power station 202 by the data transmission module, the power supply of the acquisition station 201 is transmitted from the power station 202 in a POE mode, and the power station 202 transmits the power supply and the data signals to the acquisition station 201 on an acquisition chain together through the transformer. Data acquisition control and processing in the acquisition station 201 are implemented by using an FPGA, which ensures that delay of data transmission, instruction parsing and forwarding is fixed.
In order to ensure the reliability of data, an SD storage module is further added in the acquisition station 201, the data of an artificial earthquake is stored once every time, and when the system control instrument vehicle 10 finds that the data transmission of the acquisition station 201 is lost or wrong, the acquisition station 201 can be controlled to independently send the acquired data through an instruction. The data of the next artificial earthquake is stored in a covering mode. In order to effectively process the seismic wave signals, the acquisition station 201 is additionally provided with measurement of temperature, humidity and dip angle auxiliary information.
Preferably, the distance between the collection station 201 and the connection line (which may be called a collection large line) between the collection stations 201 is fixed and less than 20 meters, and the speed is in the order of several megabbps, so that the requirement of reliable data transmission can be ensured, and the power consumption and the design complexity can be reduced.
The power station 202 and the power station 202 are connected by a wired network, a power chain is formed in a cascading manner, the power chain is also connected with the upper-level transceiving nodes by a wired connection manner, and each transceiving node is provided with a power chain. The transceiver nodes are directly connected to the topmost power station 202 of each power chain, with one power chain for each transceiver node responsible for transmitting the data collected by all power stations 202 on the power chain to the system control instrument trucks 10. The transceiver node is also connected to the power station 202 by wire, but is connected to the system control equipment cart 10 by wireless communication. While the transceiving nodes need to be equipped with separate batteries. In this embodiment, a power chain is formed by 8 power stations 202 cascaded together, so that a survey unit 20 (divided by a 5G transceiver node) may have 4800 acquisition stations 201.
Preferably, the distance between the power station 202 and the connection line (which may be called a transmission large line) between the power stations 202 is fixed and less than 100 meters, and the speed is in the order of hundreds of megabbps, which can both ensure the requirement of reliable data transmission and reduce the power consumption and the complexity of design.
Preferably, the instruction and data transceiving and analysis of the power supply stations 202 are also implemented by using an FPGA, which ensures that the instruction and data forwarding delay between the power supply stations 202 is fixed. The communication between the power stations 202 also adopts a ring network structure consistent with the acquisition station 201, and the complexity of command confirmation operation and transmission design is reduced.
Preferably, the power station 202 uses a main-standby dual-battery power supply mode, has the capability of monitoring the battery power and automatically switching, and can automatically switch to the standby battery power supply when the main battery power is insufficient and give a prompt that the battery power is low.
In order to ensure the reliability of the system, two ends of each power supply chain may be connected to a transceiver station as a primary backup, and when the transceiver node at one end is determined to be faulty, the communication flow direction of all stations in the exploration unit 20 is changed to the transceiver node at the other end.
In this embodiment, the wired networks are all ring network topologies, in an embodiment of the present invention, the instruction transmission between the acquisition stations 201 is a ring transmission manner, as shown in fig. 2, all operations are sent by the power station 202, after receiving a control instruction sent by the system control instrument vehicle 10, the power station 202 generates a new instruction for controlling the acquisition station 201 and sends the new instruction to the ring network of the acquisition chain, and the acquisition station 201 forwards the instruction while receiving the instruction, so that the forwarding only takes several bits of time, after forwarding for one turn by the power station 202 on the acquisition chain, the power station 202 receives the instruction again, and at this time, it is considered that the instruction has been received by the acquisition station 201. After the acquisition station 201 receives and analyzes the instruction, if the instruction content is that the acquisition station is required to execute the relevant operation, the corresponding operation is executed, no response is made after the operation, and if the instruction of the acquisition station 201 needs to be confirmed, whether the instruction of the acquisition station 201 is executed can be carried out by retransmitting an instruction for inquiring the state of the acquisition station 201 through the system control instrument vehicle 10.
In the invention, the forwarding and the analysis of the instruction are simultaneous, the forwarding only occupies the time of a few bits, the receiving and the analysis of the instruction are realized by the FPGA, and the receiving and the analysis time are determined, so that the high-precision synchronization of the time of the acquisition station 201 of the whole system can be ensured by utilizing the transmission delay compensation.
In an embodiment of the present invention, the data transmission between the acquisition stations 201 is also in a ring transmission manner (as shown in fig. 2), after an artificial earthquake occurs, the system control instrument vehicle 10 sends a data recovery instruction, and after the power station 202 receives the data recovery instruction, the data return instructions are sent to the acquisition stations 201 on the subordinate acquisition chains one by one, for example, an instruction for requesting data return of the first acquisition station 201 is sent first, and the instruction returns to the power station 202 again after being forwarded by one turn of the acquisition chain, at this time, the power station 202 waits for the data of the first acquisition station 201 to arrive, where the first acquisition station 201 is the acquisition station 201 that is close to and directly connected to the power station 202. Each acquisition station 201 in the acquisition chain only starts to transmit data in a packet manner after the instruction is analyzed by the first acquisition station 201, and the data transmission is transmitted upwards (in the direction of the power station 202) along the acquisition station 201 and no longer passes through the stations behind the station (for example, the first acquisition station 201 directly sends the data upwards to the power station 202, the following acquisition stations 201 forward the data upwards to the first acquisition station 201, and then forward the data to the power station 202 through the first acquisition station 201, and so on). After the power station 202 receives the data frame marked as the last frame by the first acquisition station 201, it starts to send an instruction for requesting the data return of the subsequent acquisition station 201, and so on, and collects the data of the whole acquisition chain.
In an embodiment of the present invention, the distance between the acquisition station 201 and the acquisition station 201 is 13.75 meters, the transmission rate is 4Mbps, the transmission adopts differential signal transmission, the differential signal is directly driven by the FPGA and transmitted to a twisted differential line through an impedance matching circuit and a network transformer, and differential manchester encoding is performed before data transmission, so as to ensure the reliability of data transmission.
In an embodiment of the present invention, the power station 202 is composed of a transmission interface module connected to the acquisition chain, a transmission module connected to the upstream and downstream power stations 202, an FPGA, a data cache module, a power circuit, a battery management module, and a POE power transmission module.
The power station 202 uses an external 48V main/standby dual-battery to supply power, and uses a flyback switching power supply to form a power circuit to generate power required by the power station 202. The battery management module is mainly a power supply voltage detection circuit, the FPGA continuously receives the capacity data of the battery, when the capacity data is judged to be smaller than a threshold value, the battery management module is automatically switched to a standby battery, and an LED indicator light with insufficient main battery circuits is lightened.
The transmission interface module connected with the acquisition chain is a transmission module with a rate of 4Mbps, and the transmission interface module is consistent with the data transmission module of the acquisition station 201 and is realized by adopting differential transmission. The transmission module connected to the upstream and downstream power stations 202 is a 100Mbps data transmission module, which may be implemented based on an ethernet physical layer, and may also be the same as a 4Mbps transmission module circuit, and mainly includes an impedance matching circuit, a 1:1 network transformer module, and a comparator module.
The power stations 202 are also in a ring network transmission structure, the instruction processing protocol of the transmission structure is similar to the transmission protocol between the acquisition stations 201 described above, the transceiving node forwards the instruction sent by the system control instrument vehicle 10 to the subordinate power station 202, the power station 202 forwards the instruction at the same time of receiving the instruction, and after the instruction is forwarded for one circle, the transceiving node receives the instruction again, and considers that the power station 202 has received the corresponding instruction. The data transmission is also consistent with the processing of the acquisition station 201, the transceiving node sequentially sends a data return instruction to the lower power supply station 202, the power supply station 202 which needs to return sends the data to the transceiving node in a packaged manner, and the power supply station 202 which does not send the data needs to store the data in the cache.
In one embodiment of the present invention, the transceiver node includes a power circuit, a transmission interface module connected to the power chain, a wireless transceiver module connected to the system control instrument cart 10, an FPGA, and a data buffer module.
The transceiving node is also powered by an external power supply, a flyback switching power supply is used to convert the power supply into a power supply circuit of the transceiving node, a transmission interface module connected with a power supply chain is consistent with the transmission module between the power supply stations 202, the wireless transceiving module in the embodiment can be directly realized by a commercial 5G transceiving module, mainly comprises a baseband module and a radio frequency module, and is realized by adopting a standard 5G transmission protocol.
Preferably, to ensure the reliability of the data, the acquisition station 201 has a data storage capability, and can store the data of the artificial earthquake acquired each time.
The wireless transceiving node 203 comprises a GPS receiving module for synchronizing the wireless transceiving node 203; after the GPS receiving module receives the command, the wireless transceiving node 203 transmits a time synchronization command to the power station 202 connected thereto, and each power station 202 and the collection station 201 compensate according to the delay value, so as to synchronize the exploration unit 20. The distances between the acquisition stations 201 on the acquisition chain are the same; the distance between the power supply station 202 and the first acquisition station 201 of the acquisition chain under the power supply station is the same as the distance between the acquisition stations 201 of the acquisition chain. The power stations 202 on the power chain are at the same distance from each other, and the transceiver node is at the same distance from the first power station 202 on the subordinate power chain as the distance between the power stations 202 on the power chain. From the above description of the positions of the acquisition station 201 and the power station 202 in the embodiment, the data transmission delay, the instruction receiving and analyzing delay, and the forwarding delay between the acquisition station 201 and the power station 202 are all fixed, so that the delay of each power station 202 receiving the time synchronization instruction sent by the transceiving node is only related to the topological relationship between the transceiving nodes, that is, the delay is equal to how many power stations 202 are spaced between the transceiving node and the current power station 202.
After the seismic exploration system is expanded, in order to ensure that the whole system still has excellent acquisition time synchronization precision, the invention also provides a method for synchronizing by utilizing a GPS receiving module among the exploration units 20 and simultaneously synchronizing by utilizing a wired transmission delay compensation mode in the exploration units 20. Compared with the mode of only using GPS synchronization in the prior art, the method does not need the acquisition station 201 and the power supply station 202 to be also provided with a GPS receiving module, so that the power consumption of the acquisition station 201 is reduced, the system has higher lane capability, and the synchronization precision is also improved.
A method of a hybrid wireless communication and wired network seismic exploration system, comprising the steps of:
s1, the system control instrument vehicle sends a data recovery instruction to the wireless transceiving node through wireless communication;
s2, the wireless transceiving node transmits the data recovery instruction to the power station through the wired network so as to collect the state and data of the acquisition station;
s3, after the acquisition station receives the data recovery instruction through the wired network, the acquisition station forwards the data recovery instruction to the power station, and the data recovery instruction is considered to be received by the acquisition station at the moment; meanwhile, the acquisition station analyzes and executes the data recovery instruction;
s4, the data is transmitted to the power station by the acquisition station through the wired network;
s5, the power station transmits the state and data of the acquisition station to the wireless transceiving node through the wired network;
s6, the wireless transceiving node transmits data to the system control instrument vehicle through wireless communication;
s7, the system control instrument vehicle sends a control instruction to the wireless transceiving node through wireless communication;
s8, the wireless transceiving node transmits the control instruction to the power station through the wired network;
s9, after the acquisition station receives the control instruction through the wired network, the acquisition station forwards the control instruction to the power supply station, and the control instruction is considered to be received by the acquisition station at the moment; and meanwhile, the acquisition station analyzes and executes the control command.
When the power supply station is connected to the plurality of acquisition chains through the wired network, the step S3 includes the steps of:
s31, after receiving the data recovery command, the power station sends the data recovery command to the collection stations connected with the power station one by one;
s32, transmitting the data recovery command to a power supply station after the data recovery command is transmitted through a wired network of an acquisition chain;
s33, when executing S32 step, the first collecting station transmits data to the power station, and the power station takes the data received by the first collecting station as the last frame of the data frame; the first acquisition station is an acquisition station which is directly connected with the power supply station in an acquisition chain;
s34, the acquisition station behind the first acquisition station transmits the data to the first acquisition station;
s35, the first acquisition station transmits the data to the power station through the wired network;
and S36, repeating the steps S34-S35 until the data of all the acquisition stations in the acquisition chain are received.
After the seismic exploration system is expanded, in order to ensure that the whole system still has excellent acquisition time synchronization precision, the invention also provides a method for synchronizing by utilizing GPS synchronization among exploration units and utilizing a wired transmission delay compensation mode inside the exploration units.
T1, the system control instrument vehicle sends a time synchronization instruction to the wireless receiving and sending nodes through wireless communication, the receiving and sending nodes between the exploration units are provided with GPS receivers and use the GPS to synchronize the time, the system control instrument vehicle sends the time synchronization instruction, and the receiving and sending nodes add the time of the receiving and sending nodes to the time synchronization instruction (the time is set as T) after receiving the instruction.
T2, the wireless transceiving node sends the time synchronization command to the power station under control, and as described in the above embodiments for the implementation of the acquisition station and the power station, the data transmission delay, command receiving and parsing delay, and forwarding delay between the acquisition station and the power station are all fixed, so that the delay of receiving the time synchronization command sent by the transceiving node by each power station is only related to the topological relationship between the transceiving nodes, i.e. the delay is equal to how many power stations are spaced between the transceiving node and the current power station, and if the first power station receives the synchronization command and parses the sending time T of the transceiving node included in the command, the delay is 1 × Δ T × (Δ T ×) 1 × (Δ T ×) (Δ T is determined by the first power station receiving the synchronization command and parsing theline+Δtdevice)ΔtlineFor data delay in transmission over cable, Δ tdeviceThe delays are received, forwarded and resolved for a single power station. Similarly, the second power station receives the synchronization command and analyzes that the time delay elapsed when the transmission time t of the transceiving node included in the command is 2 × Δ t, and so on.
In one embodiment of the present invention, Δ t ═ Δ tline+ΔtdeviceCan be determined by means of experimental measurement and can also be determined by means of similar PTP timeThe manner of synchronization is determined. The way of time synchronization by PTP is as follows:
1) when the transceiving node sends a first time synchronization command, the sending time is t1, and the time of the power station when the first power station receives the command is t2, then t2 is t1+ Δ t + Offset, which is the time difference between the power station and the 5G receiving station, and the power station buffers t1 and t 2.
2) The transceiving node sends a time synchronization request confirmation instruction, the first power supply station sends a time synchronization request response after receiving the instruction, and the time t3 of the first power supply station is added into the response.
3) The time when the transceiving node receives the time synchronization request response sent by the first power station is t4, and then t3 is resolved, where t4 is t3+ Δ t-offset (assuming that the direction of the first power station responding to the command is uplink, i.e. directly transmitted to the transceiving node, therefore, two Δ t are consistent). Then generating a time synchronization calculation instruction, adding t3 and t4 into the instruction, and sending the instruction to the power station again;
4) the first power station resolves t3 and t4 after receiving the time synchronization calculation command, because t4 is t3+ Δ t-offset, and t2 is t1+ Δ t + offset, so Δ t is (t2-t1+ t4-t 3)/2. Therefore, by t3, t4 combines the previously buffered values of t1 and t2 to calculate Δ t.
T3, when the transmission delay of the time synchronization command between each power station and the transceiver node is obtained, the delay can be compensated to obtain accurate synchronization time.
The time synchronization mode of the T4 and the acquisition station is consistent with the mode, after the clocks of all power supply stations on the power supply chain are synchronized, the power supply station sends a time synchronization command to the acquisition station on the acquisition chain subordinate to the power supply station, the time of the acquisition station is T + delta T, and delta T is n (delta T)line+Δtdevice) Where n is the number of acquisition stations between the acquisition station receiving the data and the power station, Δ tlineFixed delay for cable transmission of wired networks, Δ tdeviceThe delay of internal transfer of each stage of site can be ensured to be fixed for instruction receiving, analysis and forwarding. The synchronization mode can synchronize the time of the system acquisition station to ns level, and meets the requirement of large scaleRequirements for seismic exploration systems.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A seismic exploration system with a mixture of wireless communication and a wired network is characterized by comprising a system control instrument vehicle and a plurality of independently arranged exploration units, wherein the exploration units are connected with the system control instrument vehicle through wireless communication; the system control instrument vehicle is used for sending instructions to the exploration unit and then receiving the acquired data of the exploration unit;
the exploration unit comprises an acquisition station, a power supply station connected with the acquisition station through a wired network and a wireless transceiving node connected with the power supply station through the wired network, wherein the acquisition station is used for acquiring artificial seismic signals; the power supply station is used for supplying power to the acquisition station, sending instructions and collecting the state and data of the acquisition station; and the wireless transceiving node is used for transmitting instructions between the power supply station and the system control instrument vehicle.
2. The hybrid wireless-and-wired-network seismic survey system of claim 1, wherein a plurality of said acquisition stations form an acquisition chain by means of wired cascading, each of said power stations being connected to a plurality of said acquisition chains by means of a wired network; preferably, the distances between the acquisition stations on the acquisition chains are the same; the distance between the power supply station and the first acquisition station on the acquisition chain under the power supply station is the same as the distance between the acquisition stations on the acquisition chain.
3. The hybrid wireless-communication and wired-network seismic survey system of claim 1, wherein a plurality of said power stations are organized in a power chain by wired concatenation, one said power chain being connected to each said wireless transceiver node by a wired network; preferably, the power stations on the power supply chain are at the same distance from each other, and the distance between the transceiver node and the first power station on the subordinate power supply chain is the same as the distance between the power stations on the power supply chain.
4. A hybrid wireless-communication and wired-network seismic survey system as claimed in claim 3, wherein the wireless transceiver nodes are connected to both ends of the power supply chain.
5. The hybrid wireless-communication and wired-network seismic survey system of claim 1, wherein the wireless transceiver node comprises a GPS receiving module for synchronizing the wireless transceiver node; after the GPS receiving module receives the instruction, the wireless transceiving node sends a time synchronization instruction to the power supply stations connected with the wireless transceiving node, and each power supply station and the collecting station compensate according to a delay value so as to synchronize the exploration unit.
6. The hybrid wireless-communication and wired-network seismic survey system of claim 1, wherein the wired networks are all ring network topologies.
7. A method of using a hybrid wireless communication and wireline network seismic survey system as claimed in any of claims 1 to 6, comprising the steps of:
s1, the system control instrument vehicle sends a data recovery instruction to the wireless transceiving node through wireless communication;
s2, the wireless transceiving node transmits the data recovery instruction to the power station through the wired network so as to collect the state and data of the acquisition station;
s3, after the acquisition station receives the data recovery instruction through the wired network, the acquisition station forwards the data recovery instruction to the power station, and the data recovery instruction is considered to be received by the acquisition station at the moment; meanwhile, the acquisition station analyzes and executes the data recovery instruction;
s4, the data is transmitted to the power station by the acquisition station through the wired network;
s5, the power station transmits the state and data of the acquisition station to the wireless transceiving node through the wired network;
s6, the wireless transceiving node transmits data to the system control instrument vehicle through wireless communication;
s7, the system control instrument vehicle sends a control instruction to the wireless transceiving node through wireless communication;
s8, the wireless transceiving node transmits the control instruction to the power station through the wired network;
s9, after the acquisition station receives the control instruction through the wired network, the acquisition station forwards the control instruction to the power supply station, and the control instruction is considered to be received by the acquisition station at the moment; and meanwhile, the acquisition station analyzes and executes the control command.
8. The method for seismic surveying of a combination of wireless communication and a wired network of claim 7 wherein step S3 comprises the steps of, when the power station is connected to the plurality of acquisition chains by the wired network:
s31, after receiving the data recovery command, the power station sends the data recovery command to the collection stations connected with the power station one by one;
s32, transmitting the data recovery command to a power supply station after the data recovery command is transmitted through a wired network of an acquisition chain;
s33, when executing S32 step, the first collecting station transmits data to the power station, and the power station takes the data received by the first collecting station as the last frame of the data frame; the first acquisition station is an acquisition station which is directly connected with the power supply station in an acquisition chain;
s34, the acquisition station behind the first acquisition station transmits the data to the first acquisition station;
s35, the first acquisition station transmits the data to the power station through the wired network;
and S36, repeating the steps S34-S35 until the data of all the acquisition stations in the acquisition chain are received.
9. A method for a seismic survey mixing wireless communication and wired networks, as claimed in claim 7, further comprising the steps of:
t1, the system control instrument vehicle sends a time synchronization instruction to the wireless transceiving node through wireless communication;
t2, the wireless transceiving node sends the time synchronization command to the power supply chain, and the time delay of the power supply station receiving the time synchronization command in the power supply chain is fixed to be equal to N (delta T)line+Δtdevice) Where N is the number of power stations between the power station receiving the data and the transceiving node, Δ tlineFixed delay for cable transmission of wired networks, Δ tdeviceThe delay of internal transfer of each stage of station can be ensured to be fixed for instruction receiving, analysis and forwarding;
t3, setting the time T + delta T in the synchronous command as the time of the power station by the power station;
after the clocks of all power supply stations on the power supply chain are synchronized, the power supply station sends a time synchronization instruction to an acquisition station on a subordinate acquisition chain, wherein the time of the acquisition station is T + delta T, and the delta T is n (delta T)line+Δtdevice) Where n is the number of acquisition stations between the acquisition station receiving the data and the power station, Δ tlineFixed delay for cable transmission of wired networks, Δ tdeviceThe delay of internal transfer of each stage of site can be ensured to be fixed for instruction receiving, analysis and forwarding.
10. The method of claim 9, wherein at is a time delay fixed time at which the power station receives the time synchronization commanddeviceIs a fixed value; delta t in delay fixation of receiving time synchronization command by acquisition stationdeviceIs a fixed value.
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| CN202011467946.0A CN112785828B (en) | 2020-12-14 | 2020-12-14 | Seismic exploration system and method with wireless communication and wired network mixed |
| PCT/CN2020/141136 WO2022126759A1 (en) | 2020-12-14 | 2020-12-30 | Wireless communication and wired network mixed seismic exploration system and method |
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| CN202011467946.0A CN112785828B (en) | 2020-12-14 | 2020-12-14 | Seismic exploration system and method with wireless communication and wired network mixed |
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| CN112785828B (en) | 2022-04-22 |
| WO2022126759A1 (en) | 2022-06-23 |
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