Shieldable acquisition station, wired telemetry seismograph, and acquisition station status determination method

Abstract

The present invention provides a shieldable acquisition station, a wired telemetry seismograph, and a method for determining the state of the acquisition station. The shieldable acquisition station includes a shieldable component and an acquisition device; the first moving contact end and the second moving contact end of the shieldable component are respectively connected to the uplink main line and the downlink main line; the first shielding end of the shieldable component is connected to the second shielding end; the non-shielding end of the shieldable component is connected to the acquisition device; the acquisition device collects the surface vibration signal of the current position when the shieldable component is closed; the acquisition device is also used to stop working when the shieldable component is turned on. In the present invention, the shieldable component is set to shield the faulty acquisition station, so that the maintenance personnel can handle the faulty acquisition station without affecting the operation of the field acquisition main line of the wired telemetry seismograph.

Description

Technical Field

[0001] The present invention relates to the technical field of seismic exploration, and in particular to a shieldable acquisition station, a wired telemetry seismograph and an acquisition station state determination method. Background Art

[0002] At present, the most commonly used seismic instrument for land seismic exploration is still the wired telemetry seismograph. In the wired seismograph system, the field acquisition line is the main body of the instrument system. With the current development of seismic exploration towards ultra-large scale and ultra-high number of channels, the number of seismic acquisition channels deployed at one time in conventional seismic exploration work usually reaches thousands, tens of thousands or even hundreds of thousands. The system architecture of conventional wired seismographs is divided into host system, cross station, power station and acquisition station. The host system (usually installed on the instrument vehicle) is the core of the seismograph. A set of instruments only needs one host system. Each survey line requires a cross station. The cross stations on different survey lines are connected by cross lines and finally connected to the host system. The power station is used to power the wired system on the survey line. Each power station can power dozens of acquisition stations. The acquisition station is the most basic unit for field acquisition of seismographs. It is responsible for converting the surface vibration signal at each measuring point into a digital signal. The acquisition station is divided into a single-station single-channel type or a single-station multi-channel (generally 4 or 6 channels) type. Taking a single-station single-channel as an example, a seismograph system with a ten-thousand-channel level requires 10,000 seismic digital acquisition stations. In order to facilitate field construction, existing seismograph collection stations usually use special cables (i.e., main lines) to fix several collection stations into a string to form a field collection main line. Special plugs are reserved at both ends of each field collection main line to achieve connection between field collection main lines.

[0003] Since the seismic acquisition station is the most basic, largest and most important component of the entire wired seismograph system, the design of the acquisition station is of paramount importance, and its performance determines the quality of the entire seismograph system. The nature of field construction requires that the acquisition station should be stable, reliable, simple, lightweight and low-cost. If thousands or even tens of thousands of acquisition stations each use a separate data transmission or power supply cable to connect to the host, cross station or power supply station at the same time, the entire field acquisition line will require tens of thousands of cables to be implemented, which is obviously not feasible. Therefore, the field acquisition line of the wired seismograph system generally requires the use of as few cables as possible to achieve as many functions as possible, including bidirectional power supply and bidirectional data transmission. This requires that the cable of the wired seismograph needs to be powered and multiplexed for data transmission. If a single cable (usually a 4-core or 6-core twisted pair structure) is used to provide bidirectional power supply and bidirectional data transmission for thousands of acquisition stations on a survey line, the acquisition station must be serially cascaded, that is, a certain acquisition station on a set of survey lines needs to convey the host command issued by the previous acquisition station downward, receive data transmitted from other acquisition stations below, and connect the data of this acquisition station to transmit it to the previous acquisition station in the direction of the host. The acquisition station connection method used by existing wired seismographs is currently a better method for data transmission and power supply. However, the fatal flaw of this cascade data transmission method is that when a certain acquisition station fails, it may cause communication problems in all the acquisition stations below it. At this time, it is necessary to replace the entire field acquisition line where the failed acquisition station is located. However, many seismic exploration sites are located in harsh environments, steep terrains, mountains, swamps, transition zones, etc. Replacing cables will seriously affect construction efficiency and greatly increase the additional cost of equipment maintenance. Summary of the invention

[0004] The purpose of the present invention is to provide a shieldable collection station, a wired telemetry seismograph and a method for determining the state of the collection station. The shieldable collection station is applied to the wired telemetry seismograph and can shield the faulty collection station so that maintenance personnel can handle the faulty collection station without affecting the operation of the wired telemetry seismograph's field collection line.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A shieldable acquisition station is used for a wired telemetry seismograph, and comprises:

[0007] Shieldable components and acquisition devices;

[0008] The first moving contact end of the shieldable component is connected to the uplink bus line; the second moving contact end of the shieldable component is connected to the downlink bus line; the first shielding end of the shieldable component is connected to the second shielding end; the unshielded end of the shieldable component is connected to the acquisition device; the uplink bus line is the one closer to the host system among the two bus lines connected to the same acquisition device in the wired telemetry seismograph; the downlink bus line is the one farther away from the host system among the two bus lines connected to the same acquisition device in the wired telemetry seismograph; both the uplink bus line and the downlink bus line are bidirectional data transmission lines;

[0009] The collecting device is used to collect the ground vibration signal at the current position when the shieldable component is closed; the collecting device is also used to stop working when the shieldable component is opened; the current position is the position of the collecting device;

[0010] When the shieldable component is closed, the first moving contact end and the second moving contact end are both connected to the non-shielding end of the shieldable component;

[0011] When the shieldable component is opened, the first moving contact end is connected to the first shielding end, and the second moving contact end is connected to the second shielding end.

[0012] Optional, shieldable components include:

[0013] a first moving switch group and a second moving switch group;

[0014] The number of the moving switches in the first moving switch group, the number of the moving switches in the second moving switch group, the number of the wire cores in the uplink main line, and the number of the wire cores in the downlink main line are all equal;

[0015] The moving contacts of the multiple moving switches in the first moving switch group are the first moving contact ends of the shieldable component; the moving contacts of the multiple moving switches in the second moving switch group are the second moving contact ends of the shieldable component; the shielding ends of the multiple moving switches in the first moving switch group are the first shielding ends of the shieldable component; the shielding ends of the multiple moving switches in the second moving switch group are the second shielding ends of the shieldable component; the non-shielding ends of the multiple moving switches in the first moving switch group and the non-shielding ends of the multiple moving switches in the second moving switch group are the non-shielding ends of the shieldable component;

[0016] The moving contacts of the multiple moving switches in the first moving switch group are connected to the multiple wire cores in the uplink main line in a one-to-one correspondence;

[0017] The moving contacts of the multiple moving switches in the second moving switch group are connected to the multiple wire cores in the downstream main line in a one-to-one correspondence;

[0018] The shielding ends of the plurality of dynamic switches in the first dynamic switch group are connected to the shielding ends of the plurality of dynamic switches in the second dynamic switch group in a one-to-one correspondence;

[0019] The non-shielded ends of the plurality of dynamic switches in the first dynamic switch group and the non-shielded ends of the plurality of dynamic switches in the second dynamic switch group are both connected to the acquisition device.

[0020] Optional, shieldable acquisition station also includes:

[0021] Multiple transformers;

[0022] The number of transformers is equal to the number of dynamic switches in the first dynamic switch group;

[0023] Both ends of the low voltage coil in each transformer are connected to the collection device;

[0024] The two ends of the high voltage coil in the same transformer are respectively connected to the non-shielded ends of two moving switches corresponding to the wire core pair with the same data transmission direction in the same large line; the large line is an upward large line or a downward large line.

[0025] Optionally, the collection device specifically includes:

[0026] Digital transmission unit, main control unit and acquisition unit;

[0027] The main control unit is connected to the digital transmission unit and the acquisition unit respectively; both ends of the low-voltage coil in each transformer are connected to the digital transmission unit;

[0028] The digital transmission unit is used to receive instructions transmitted through the first wire core pair in the uplink bus, and transmit instructions through the first wire core pair in the downlink bus; the data transmission direction in the first wire core pair in the uplink bus and the first wire core pair in the downlink bus is from the host system to the acquisition station;

[0029] The main control unit is used to analyze the instructions and control the collection unit to collect the surface vibration signal of the current position according to the analyzed instructions;

[0030] The digital transmission unit is also used to receive a surface vibration signal sequence; the surface vibration signal sequence includes one or more positions transmitted by the second core pair of the downlink line, and surface vibration signals corresponding to the one or more positions;

[0031] The main control unit is further used to add the surface vibration signal of the current position and the current position to the surface vibration signal sequence to obtain an updated surface vibration signal sequence;

[0032] The main control unit is also used to detect the impedance of the main line; the main line impedance is the impedance of the upstream main line or the impedance of the downstream main line;

[0033] The digital transmission unit is also used to transmit the main line impedance and the updated surface vibration signal sequence through the second core pair of the uplink main line; the data transmission direction in the second core pair of the downlink main line and the second core pair of the uplink main line is from the acquisition station to the host system.

[0034] Optionally, the collection device further includes:

[0035] Power supply unit;

[0036] The high voltage coils of the multiple transformers are also connected to the positive or negative pole of the power supply unit; the data transmission direction of the wire core pairs corresponding to different transformers connected to the same electrode of the power supply unit is the same; the data transmission direction of the wire core pairs corresponding to the transformers connected to different electrodes in the power supply unit is different; the electrode is the positive or negative pole;

[0037] The power supply unit is connected to the digital transmission unit, the main control unit and the acquisition unit respectively; the power supply unit is used to perform DC-DC conversion on the high-level voltage transmitted by the acquisition station line, and obtain a low-level voltage which is transmitted to the digital transmission unit, the main control unit and the acquisition unit respectively.

[0038] A wired telemetry seismograph, comprising

[0039] Host system, multiple crossover stations, multiple field collection lines and multiple power supply stations;

[0040] Each field collection line is connected to the host system through a cross station; the cross station corresponds to the field collection line one by one; each field collection line is connected to multiple power stations; multiple cross stations are connected in series through cross lines;

[0041] Each field collection line includes a plurality of the above-mentioned shieldable collection stations connected in series;

[0042] The host system is used to determine the position serial number of the shieldable collection station in the shielding state according to the impedance of multiple lines; the position serial numbers of all shieldable collection stations in the same field collection line increase in sequence according to the instruction transmission direction;

[0043] The host system is also used to update the collection sequence number of each shieldable collection station when the state of any shieldable collection station changes; the collection sequence numbers of all shieldable collection stations in the non-shielded state in the same field collection line increase in sequence according to the instruction transmission direction; only the shieldable collection stations in the non-shielded state have collection sequence numbers.

[0044] A method for determining the state of a collection station, the method is applied to the above-mentioned wired telemetry seismograph, the method comprising:

[0045] Get multiple large line impedances;

[0046] The position serial numbers of the shieldable collection stations in the shielding state are determined according to the impedances of multiple lines; the position serial numbers of all the shieldable collection stations in the same field collection line are increased in sequence according to the instruction transmission direction.

[0047] Optionally, determining the position sequence number of the shieldable collection station in the shielding state according to the impedances of the multiple large lines specifically includes:

[0048] Get any large line impedance as the current large line impedance;

[0049] Determine whether the current main line impedance is greater than an impedance threshold, and obtain a first determination result;

[0050] If the first judgment result is yes, then obtain the upper end position serial number and the lower end position serial number; the upper end position serial number is the position serial number of the shieldable acquisition station located at the two ends of the large line corresponding to the current large line impedance, which is closer to the host system; the lower end position serial number is the position serial number of the shieldable acquisition station located at the two ends of the large line corresponding to the current large line impedance, which is farther away from the host system; the two shieldable acquisition stations located at the two ends of the large line corresponding to the current large line impedance are both in a non-shielded state;

[0051] The state of the shieldable collection station whose position number is greater than the upper position number and lower than the lower position number on the field collection line corresponding to the current line impedance is determined as the shielding state;

[0052] Determine the position serial number of the shieldable collection station in the shielding state as the shielding position serial number;

[0053] If the first judgment result is no, the current large line impedance is updated and the process returns to the step of "judging whether the current large line impedance is greater than the impedance threshold value to obtain the first judgment result".

[0054] Optionally, after determining the position sequence number of the shieldable collection station in the shielding state according to the plurality of large line impedances, the method further includes:

[0055] Determine any field collection line as the current field collection line;

[0056] Determine the shieldable collection station with position number 1 in the current field collection line as the current shieldable collection station;

[0057] Determine whether the state of the current shieldable collection station has changed, and obtain a second determination result;

[0058] If the second judgment result is yes, the collection sequence number of the current shieldable collection station is updated, and the shieldable collection station corresponding to the next position sequence number is used as the current shieldable collection station, and the step of "judging whether the state of the current shieldable collection station has changed to obtain the second judgment result" is returned until all the position sequences on the current field collection line are traversed; the collection sequence numbers of all shieldable collection stations in the non-shielded state in the same field collection line are increased in sequence according to the instruction transmission direction; only the shieldable collection station in the non-shielded state has a collection sequence number;

[0059] If the second judgment result is no, the shieldable collection station corresponding to the next position number is used as the current shieldable collection station, and the process returns to the step of "determining whether the state of the current shieldable collection station has changed to obtain the second judgment result" until all the position numbers on the current field collection line are traversed;

[0060] Update the current field collection line and return to step "determine the shieldable collection station with position number 1 in the current field collection line as the current shieldable collection station" until all field collection lines are traversed.

[0061] Optionally, update the collection sequence number of the currently shieldable collection station, including:

[0062] Determine whether there is a shieldable collection station in a non-shielded state before the current shieldable collection station, and obtain a third determination result;

[0063] If the third judgment result is yes, then updating the collection sequence number of the current shieldable collection station and each shieldable collection station after the current shieldable collection station;

[0064] If the third judgment result is no, the collection sequence number of the current shieldable collection station is set to 0, and the collection sequence number of the current shieldable collection station and each shieldable collection station after the current shieldable collection station is updated;

[0065] Update the collection sequence number of the current shieldable collection station and each shieldable collection station after the current shieldable collection station, including:

[0066] When the current shieldable collection station changes from the shielded state to the non-shielded state, the value of the collection sequence number of the previous shieldable collection station in the non-shielded state is increased by 1 as the collection signal of the current shieldable collection station, and the value of the collection sequence number of each shieldable collection station in the non-shielded state after the current shieldable collection station is increased by 1;

[0067] When the current shieldable acquisition station changes from a non-shielded state to a shielded state, the acquisition signal of the current shieldable acquisition station is deleted, and the acquisition sequence number of each shieldable acquisition station in a non-shielded state after the current shieldable acquisition station is reduced by 1.

[0068] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0069] The present invention provides a shieldable acquisition station, a wired telemetry seismograph and a method for determining the state of the acquisition station. The shieldable acquisition station comprises a shieldable component and an acquisition device; the first moving contact end of the shieldable component is connected to an uplink bus line; the second moving contact end of the shieldable component is connected to a downlink bus line; the first shielding end of the shieldable component is connected to the second shielding end; the unshielded end of the shieldable component is connected to the acquisition device; the uplink bus line is one of two bus lines connected to the same acquisition device in the wired telemetry seismograph that is closer to a host system; the downlink bus line is one of two bus lines connected to the same acquisition device in the wired telemetry seismograph that is farther away from the host system; both the uplink bus line and the downlink bus line are bidirectional data transmission lines; the acquisition device is used to collect a surface vibration signal at a current position when the shieldable component is closed; the acquisition device is also used to stop working when the shieldable component is opened; the current position is the location of the acquisition device; when the shieldable component is closed, the first moving contact end and the second moving contact end are both connected to the unshielded end of the shieldable component; when the shieldable component is opened, the first moving contact end is connected to the first shielding end, and the second moving contact end is connected to the second shielding end. In the present invention, the faulty collection station can be shielded by arranging the shieldable components, so that the maintenance personnel can handle the faulty collection station without affecting the operation of the field collection line of the wired telemetry seismograph. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0071] Figure 1 This is a schematic diagram of the structure of the shieldable collection station in the first embodiment of the present invention when it is in an unshielded state;

[0072] Figure 2 This is a schematic diagram of the structure of the shieldable collection station in the first embodiment of the present invention when it is in a shielded state;

[0073] Figure 3 It is a structural schematic diagram of a wired telemetry seismograph in Embodiment 2 of the present invention;

[0074] Figure 4 This is a flow chart of a method for determining the state of a collection station in Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0075] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0076] The purpose of the present invention is to provide a shieldable collection station, a wired telemetry seismograph and a method for determining the state of the collection station. The shieldable collection station is applied to the wired telemetry seismograph and can shield the faulty collection station so that maintenance personnel can handle the faulty collection station without affecting the operation of the wired telemetry seismograph's field collection line.

[0077] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0078] Embodiment 1

[0079] This embodiment provides a shieldable acquisition station, which is applied to a wired telemetry seismograph. The shieldable acquisition station includes:

[0080] Shieldable components and acquisition devices;

[0081] The first moving contact end of the shieldable component is connected to the uplink bus line; the second moving contact end of the shieldable component is connected to the downlink bus line; the first shielding end of the shieldable component is connected to the second shielding end; the unshielded end of the shieldable component is connected to the acquisition device; the uplink bus line is the one closer to the host system among the two bus lines connected to the same acquisition device in the wired telemetry seismograph; the downlink bus line is the one farther away from the host system among the two bus lines connected to the same acquisition device in the wired telemetry seismograph; both the uplink bus line and the downlink bus line are bidirectional data transmission lines;

[0082] The collecting device is used to collect the ground vibration signal at the current position when the shieldable component is closed; the collecting device is also used to stop working when the shieldable component is opened; the current position is the position of the collecting device;

[0083] When the shieldable component is closed, the first moving contact end and the second moving contact end are both connected to the non-shielding end of the shieldable component;

[0084] When the shieldable component is opened, the first moving contact end is connected to the first shielding end, and the second moving contact end is connected to the second shielding end.

[0085] Among them, the shieldable components include:

[0086] a first moving switch group and a second moving switch group;

[0087] The number of the moving switches in the first moving switch group, the number of the moving switches in the second moving switch group, the number of the wire cores in the uplink main line, and the number of the wire cores in the downlink main line are all equal;

[0088] The moving contacts of the multiple moving switches in the first moving switch group are the first moving contact ends of the shieldable component; the moving contacts of the multiple moving switches in the second moving switch group are the second moving contact ends of the shieldable component; the shielding ends of the multiple moving switches in the first moving switch group are the first shielding ends of the shieldable component; the shielding ends of the multiple moving switches in the second moving switch group are the second shielding ends of the shieldable component; the non-shielding ends of the multiple moving switches in the first moving switch group and the non-shielding ends of the multiple moving switches in the second moving switch group are the non-shielding ends of the shieldable component;

[0089] The moving contacts of the multiple moving switches in the first moving switch group are connected to the multiple wire cores in the uplink main line in a one-to-one correspondence;

[0090] The moving contacts of the multiple moving switches in the second moving switch group are connected to the multiple wire cores in the downstream main line in a one-to-one correspondence;

[0091] The shielding ends of the plurality of dynamic switches in the first dynamic switch group are connected to the shielding ends of the plurality of dynamic switches in the second dynamic switch group in a one-to-one correspondence;

[0092] The non-shielded ends of the plurality of dynamic switches in the first dynamic switch group and the non-shielded ends of the plurality of dynamic switches in the second dynamic switch group are both connected to the acquisition device.

[0093] In addition, the collection station can be shielded, including:

[0094] Multiple transformers;

[0095] The number of transformers is equal to the number of dynamic switches in the first dynamic switch group;

[0096] Both ends of the low voltage coil in each transformer are connected to the collection device;

[0097] The two ends of the high voltage coil in the same transformer are respectively connected to the non-shielded ends of two moving switches corresponding to the wire core pair with the same data transmission direction in the same large line; the large line is an upward large line or a downward large line.

[0098] Specifically, the collection device includes:

[0099] Digital transmission unit, main control unit and acquisition unit;

[0100] The main control unit is connected to the digital transmission unit and the acquisition unit respectively; both ends of the low-voltage coil in each transformer are connected to the digital transmission unit;

[0101] The digital transmission unit is used to receive instructions transmitted through the first wire core pair in the uplink bus, and transmit instructions through the first wire core pair in the downlink bus; the data transmission direction in the first wire core pair in the uplink bus and the first wire core pair in the downlink bus is from the host system to the acquisition station;

[0102] The main control unit is used to analyze the instructions and control the collection unit to collect the surface vibration signal of the current position according to the analyzed instructions;

[0103] The digital transmission unit is also used to receive a surface vibration signal sequence; the surface vibration signal sequence includes one or more positions transmitted by the second core pair of the downlink line, and surface vibration signals corresponding to the one or more positions;

[0104] The main control unit is further used to add the surface vibration signal of the current position and the current position to the surface vibration signal sequence to obtain an updated surface vibration signal sequence;

[0105] The main control unit is also used to detect the impedance of the main line; the main line impedance is the impedance of the upstream main line or the impedance of the downstream main line;

[0106] The digital transmission unit is also used to transmit the main line impedance and the updated surface vibration signal sequence through the second core pair of the uplink main line; the data transmission direction in the second core pair of the downlink main line and the second core pair of the uplink main line is from the acquisition station to the host system.

[0107] In addition, the collection device also includes:

[0108] Power supply unit;

[0109] The high voltage coils of the multiple transformers are also connected to the positive or negative pole of the power supply unit; the data transmission direction of the wire core pairs corresponding to different transformers connected to the same electrode of the power supply unit is the same; the data transmission direction of the wire core pairs corresponding to the transformers connected to different electrodes in the power supply unit is different; the electrode is the positive or negative pole;

[0110] The power supply unit is connected to the digital transmission unit, the main control unit and the acquisition unit respectively; the power supply unit is used to perform DC-DC conversion on the high-level voltage transmitted by the acquisition station line, and obtain a low-level voltage which is transmitted to the digital transmission unit, the main control unit and the acquisition unit respectively.

[0111] Specifically, the structure of the acquisition station is mainly divided into a power module, a digital transmission unit, a main control unit and an acquisition unit. The acquisition unit is responsible for digitizing the analog signal of the detector. Each acquisition station has a 24-bit A / D converter in the acquisition unit, which generally uses a data acquisition circuit based on a Cirrus chip set or a data acquisition circuit based on ADS1282 and DAC1282. Among them, the ADS chip is responsible for converting the seismic analog signal detected by the seismic sensor (detector) into a digital signal, and the DAC chip is used to generate the analog signal required by the test instrument (including the pulse signal and square wave signal required for consistency testing, the sine wave signal required for distortion testing, etc.).

[0112] The digital transmission unit is responsible for transmitting the modulated digital signal uplink via the cable, and at the same time needs to parse the host instructions for downlink transmission (the host instructions are used to control how the collection station collects data, sleeps or tests indicators, etc.). The 4-core cable used to connect the collection stations is divided into 2 pairs of differential digital signal transmission lines in opposite directions, namely Figure 1-2 The "big line" in the survey line goes all the way down from the crossover station to send commands and transmit real-time seismic data (also called synchronous data) to the power station and acquisition station at the far end of the survey line. Another pair of differential lines transmits data back from the power station to the crossover station. It should be noted that these two pairs of data transmission lines are also used to power the acquisition station.

[0113] The main control unit is responsible for controlling and coordinating the work of each module, receiving commands from the central station from the transmission unit, and sending the results of AD collection back to the digital transmission unit. The main control unit only receives and executes commands on the synchronous data line and does not respond to asynchronous data. The power module is responsible for powering other units. Since the cable (main line) in the field collection line has only 4 cores, it is also necessary to be responsible for bidirectional power supply and bidirectional data transmission at the same time, which inevitably requires digital transmission and power supply multiplexing, similar to POE (Power over Ethernet, active Ethernet), which must be achieved using a digital transmission transformer. Figure 1-2 As shown, each acquisition station requires 4 data transmission transformers, and the low-voltage end of each data transmission transformer is connected to the digital transmission unit, and the high-voltage end is connected to the main line. Two pairs of main lines transmit positive and negative 36V DC levels, and at the same time load the fundamental communication digital signal generated by the data transmission transformer to transmit data and instructions. The power module is responsible for converting the high-voltage level of the high-voltage end tap of the data transmission transformer on the main line into the low voltage level required by other units of the acquisition station through DC-DC, including +5V, +3.3V, +2.5V and +1.5V.

[0114] The main technical innovations of the present invention are:

[0115] Add a bidirectional 8-way switch between the main line and the digital transformer, and set the corresponding short circuit. When the switch is thrown to the digital transformer end, such as Figure 2 As shown, the short circuit is not connected, the data transmission transformer is connected to the main line, and all the work of this acquisition station is normal. When the switch is thrown to the short circuit end, such as Figure 2 As shown, it can be seen that the cores of the left-end large line are directly short-circuited with the cores of the right-end large line, the high voltage end of the digital transmission transformer is disconnected from the large line, the power supply of the acquisition station is cut off, the data transmission is cut off, and all modules of the acquisition station stop working. It can be seen from this that: in the conventional technical solution, the N-1th acquisition station and the N+1th acquisition station cannot be isolated from the direct communication of the Nth acquisition station. When the Nth acquisition station fails, it may cause the loss of data from all subsequent acquisition stations starting from the N+1th acquisition station or direct disconnection. However, the use of the present invention enables the Nth acquisition station to directly connect the physical connection with the N-1th acquisition station and the N+1th acquisition station after the shielding is started. The failure of the Nth acquisition station does not affect the subsequent acquisition stations. When several consecutive acquisition stations fail, all failed acquisition stations are started.

[0116] The communication interface of the digital transmission unit of the acquisition station adopts LVDS mode, and adopts low voltage swing and differential mode to transmit data at high speed. The rate can still reach 40Mbps when using 50-meter twisted pair cable, and 100-meter cable can be maintained at more than 10Mbps. This ensures that the shielding of the acquisition station of the present invention does not affect the technical means of data transmission of the entire measurement line. Since the current conventional FPGA (Field Programmable Gate Array) chips all have LVDS interfaces, this communication method can also save space and cost of the acquisition station to a large extent.

[0117] When a certain acquisition station starts shielding, the N-1th acquisition station and the N+1th acquisition station are directly connected, bypassing the Nth acquisition station, that is, in the logical connection order, the N-1th acquisition station becomes the Nth acquisition station, and then the original Nth acquisition station is completely shielded, and the original seismograph host system cannot sense the existence of the Nth acquisition station. One consequence that may occur is that if the field wiring personnel do not inform the host operator or report the error, the detour is not set in the acquisition system or the wrong acquisition station is set as a detour, which will cause serious errors. In short, the shielding of the acquisition cannot be performed at will. If you want to shield the acquisition station, you must add a corresponding response plan in the entire seismic acquisition system. The present invention has designed a solution for this purpose, adding a double-sided cable impedance detection function to each acquisition station. When a certain acquisition station detects that the impedance value of the connected cable is doubled or several times the normal value, it indicates that a collection station is shielded. At this time, the pile number is bound according to the actual shielding situation of the collection station.

[0118] Conventional baseband network communication interface circuits, such as T1 / E1 or Ethernet interface circuits, all have analog / digital hybrid circuits. The driver and receiver of the interface circuit are both analog circuits, and some have automatic equalization functions. The driver has a D / A circuit that can output different waveforms according to different transmission distances. The receiving circuit can set the threshold level according to the transmission distance. The LVDS mode of the seismic acquisition network large-line communication does not have this function. In conventional seismic field acquisition large lines, since fixed-length cables are used, it is only necessary to configure a fixed matching resistor in the LVDS driving circuit of the FPGA at the digital transmission and receiving end to keep a fixed driving current. Due to the introduction of the acquisition station shielding device in the present invention, the length of the acquisition station connection cable is variable. For this reason, a D / A circuit is added to the impedance matching circuit of the communication interface, and the driving current can be adjusted according to the cable impedance to ensure that the digital transmission differential level meets the threshold requirements, thereby ensuring the stability of the communication.

[0119] The above-mentioned left and right side large line taps, shielding switches, and short-circuit circuit parts are designed to be separable from the main circuit part of the collection station when the collection station is designed. When the collection station implements the shielding operation, the main part can be separated, which does not affect the normal collection work of the entire collection system. After replacing the main circuit part of the standby collection station, the shielding switch can be turned off. It should be noted that when any collection station on the entire collection line goes online by turning off the shielding switch, the host system will remind the new station to go online and the pile number needs to be re-bound.

[0120] The technical advantage of the present invention is that a certain acquisition station can be completely shielded at any time, so that all acquisition stations in the wired seismic acquisition system can be independent. If one of the acquisition stations is damaged, only one acquisition line is lost during the acquisition process, and the entire acquisition process is not affected, which means that a large amount of arrangement inspection and worse acquisition line time caused by poor arrangement in the field can be greatly saved. The production capacity of seismic exploration construction is greatly improved, the construction efficiency of the seismic team is improved, and the construction cost is reduced.

[0121] When encountering obstacles during the field deployment of traditional instruments, such as the cable length between two collection stations cannot be guaranteed to cross the two collection points, a detour must be set up. After a collection station is set up with a detour, the collection station does not participate in data collection work, but is still responsible for completing communication work such as uplink and downlink instructions and data transmission. The technical advantage of the present invention allows the collection station to set up a true detour. When there is an obstacle between two measuring points, the collection station can be shielded. When the design spacing between the collection points is greater than the cable length, they can be shielded at intervals to save power consumption.

[0122] Embodiment 2

[0123] like Figure 3 This embodiment provides a wired telemetry seismograph, including

[0124] Host system, multiple crossover stations, multiple field collection lines and multiple power supply stations;

[0125] Each field collection line is connected to the host system through a cross station; the cross station corresponds to the field collection line one by one; each field collection line is connected to multiple power stations; multiple cross stations are connected in series through cross lines;

[0126] Each field collection line includes a plurality of shieldable collection stations described in Embodiment 1 connected in series;

[0127] The host system is used to determine the position serial number of the shieldable collection station in the shielding state according to the impedance of multiple lines; the position serial numbers of all shieldable collection stations in the same field collection line increase in sequence according to the instruction transmission direction;

[0128] The host system is also used to update the collection sequence number of each shieldable collection station when the state of any shieldable collection station changes; the collection sequence numbers of all shieldable collection stations in the non-shielded state in the same field collection line increase in sequence according to the instruction transmission direction; only the shieldable collection stations in the non-shielded state have collection sequence numbers.

[0129] Embodiment 3

[0130] like Figure 4 This embodiment also provides a method for determining the state of an acquisition station, which is applied to the wired telemetry seismograph described in the second embodiment, and includes:

[0131] Step 401: Obtain multiple large line impedances;

[0132] Step 402: Determine the position serial number of the shieldable collection station in the shielding state according to the impedance of multiple lines; the position serial numbers of all the shieldable collection stations in the same field collection line are increased in sequence according to the instruction transmission direction.

[0133] Step 402 specifically includes:

[0134] Get any large line impedance as the current large line impedance;

[0135] Determine whether the current main line impedance is greater than an impedance threshold, and obtain a first determination result;

[0136] If the first judgment result is yes, then obtain the upper end position serial number and the lower end position serial number; the upper end position serial number is the position serial number of the shieldable acquisition station located at the two ends of the large line corresponding to the current large line impedance, which is closer to the host system; the lower end position serial number is the position serial number of the shieldable acquisition station located at the two ends of the large line corresponding to the current large line impedance, which is farther away from the host system; the two shieldable acquisition stations located at the two ends of the large line corresponding to the current large line impedance are both in a non-shielded state;

[0137] The state of the shieldable collection station whose position number is greater than the upper position number and lower than the lower position number on the field collection line corresponding to the current line impedance is determined as the shielding state;

[0138] Determine the position serial number of the shieldable collection station in the shielding state as the shielding position serial number;

[0139] If the first judgment result is no, the current large line impedance is updated and the process returns to the step of "judging whether the current large line impedance is greater than the impedance threshold value to obtain the first judgment result".

[0140] After step 402, the method further includes:

[0141] Determine any field collection line as the current field collection line;

[0142] Determine the shieldable collection station with position number 1 in the current field collection line as the current shieldable collection station;

[0143] Determine whether the state of the current shieldable collection station has changed, and obtain a second determination result;

[0144] If the second judgment result is yes, the collection sequence number of the current shieldable collection station is updated, and the shieldable collection station corresponding to the next position sequence number is used as the current shieldable collection station, and the step of "judging whether the state of the current shieldable collection station has changed to obtain the second judgment result" is returned until all the position sequences on the current field collection line are traversed; the collection sequence numbers of all shieldable collection stations in the non-shielded state in the same field collection line are increased in sequence according to the instruction transmission direction; only the shieldable collection station in the non-shielded state has a collection sequence number;

[0145] If the second judgment result is no, the shieldable collection station corresponding to the next position number is used as the current shieldable collection station, and the process returns to the step of "determining whether the state of the current shieldable collection station has changed to obtain the second judgment result" until all the position numbers on the current field collection line are traversed;

[0146] Update the current field collection line and return to step "determine the shieldable collection station with position number 1 in the current field collection line as the current shieldable collection station" until all field collection lines are traversed.

[0147] Update the collection sequence number of the currently shieldable collection station, including:

[0148] Determine whether there is a shieldable collection station in a non-shielded state before the current shieldable collection station, and obtain a third determination result;

[0149] If the third judgment result is yes, then updating the collection sequence number of the current shieldable collection station and each shieldable collection station after the current shieldable collection station;

[0150] If the third judgment result is no, the collection sequence number of the current shieldable collection station is set to 0, and the collection sequence number of the current shieldable collection station and each shieldable collection station after the current shieldable collection station is updated;

[0151] Update the collection sequence number of the current shieldable collection station and each shieldable collection station after the current shieldable collection station, including:

[0152] When the current shieldable collection station changes from the shielded state to the non-shielded state, the value of the collection sequence number of the previous shieldable collection station in the non-shielded state is increased by 1 as the collection signal of the current shieldable collection station, and the value of the collection sequence number of each shieldable collection station in the non-shielded state after the current shieldable collection station is increased by 1;

[0153] When the current shieldable acquisition station changes from a non-shielded state to a shielded state, the acquisition signal of the current shieldable acquisition station is deleted, and the acquisition sequence number of each shieldable acquisition station in a non-shielded state after the current shieldable acquisition station is reduced by 1.

[0154] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0155] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A shieldable collection station, characterized in that: The shieldable acquisition station is applied to the wired telemetry seismograph, and the shieldable acquisition station includes: Shieldable components and acquisition devices; The first moving contact end of the shieldable component is connected to the uplink bus line; the second moving contact end of the shieldable component is connected to the downlink bus line; the first shielding end of the shieldable component is connected to the second shielding end; the unshielded end of the shieldable component is connected to the acquisition device; the uplink bus line is the one closer to the host system among the two bus lines connected to the same acquisition device in the wired telemetry seismograph; the downlink bus line is the one farther away from the host system among the two bus lines connected to the same acquisition device in the wired telemetry seismograph; both the uplink bus line and the downlink bus line are bidirectional data transmission lines; The collecting device is used to collect the ground vibration signal at the current position when the shieldable component is closed; the collecting device is also used to stop working when the shieldable component is opened; the current position is the position of the collecting device; When the shieldable component is closed, the first moving contact end and the second moving contact end are both connected to the non-shielding end of the shieldable component; When the shieldable component is opened, the first moving contact end is connected to the first shielding end, and the second moving contact end is connected to the second shielding end; Shieldable components include: a first moving switch group and a second moving switch group; The number of the moving switches in the first moving switch group, the number of the moving switches in the second moving switch group, the number of the wire cores in the uplink main line, and the number of the wire cores in the downlink main line are all equal; The moving contacts of the multiple moving switches in the first moving switch group are the first moving contact ends of the shieldable component; the moving contacts of the multiple moving switches in the second moving switch group are the second moving contact ends of the shieldable component; the shielding ends of the multiple moving switches in the first moving switch group are the first shielding ends of the shieldable component; the shielding ends of the multiple moving switches in the second moving switch group are the second shielding ends of the shieldable component; the non-shielding ends of the multiple moving switches in the first moving switch group and the non-shielding ends of the multiple moving switches in the second moving switch group are the non-shielding ends of the shieldable component; The moving contacts of the multiple moving switches in the first moving switch group are connected to the multiple wire cores in the uplink main line in a one-to-one correspondence; The moving contacts of the multiple moving switches in the second moving switch group are connected to the multiple wire cores in the downstream main line in a one-to-one correspondence; The shielding ends of the plurality of dynamic switches in the first dynamic switch group are connected to the shielding ends of the plurality of dynamic switches in the second dynamic switch group in a one-to-one correspondence; The non-shielded ends of the plurality of dynamic switches in the first dynamic switch group and the non-shielded ends of the plurality of dynamic switches in the second dynamic switch group are both connected to the acquisition device.

2. The shieldable acquisition station according to claim 1, characterized in that: The shieldable collection station also includes: Multiple transformers; The number of transformers is equal to the number of dynamic switches in the first dynamic switch group; Both ends of the low voltage coil in each transformer are connected to the collection device; The two ends of the high voltage coil in the same transformer are respectively connected to the non-shielded ends of two moving switches corresponding to the wire core pair with the same data transmission direction in the same large line; the large line is an upward large line or a downward large line.

3. The shieldable collection station according to claim 2, characterized in that: The collection device specifically includes: Digital transmission unit, main control unit and acquisition unit; The main control unit is connected to the digital transmission unit and the acquisition unit respectively; both ends of the low-voltage coil in each transformer are connected to the digital transmission unit; The digital transmission unit is used to receive instructions transmitted through the first wire core pair in the uplink bus, and transmit instructions through the first wire core pair in the downlink bus; the data transmission direction in the first wire core pair in the uplink bus and the first wire core pair in the downlink bus is from the host system to the acquisition station; The main control unit is used to analyze the instructions and control the collection unit to collect the surface vibration signal of the current position according to the analyzed instructions; The digital transmission unit is also used to receive a surface vibration signal sequence; the surface vibration signal sequence includes one or more positions transmitted by the second core pair of the downlink line, and surface vibration signals corresponding to the one or more positions; The main control unit is further used to add the surface vibration signal of the current position and the current position to the surface vibration signal sequence to obtain an updated surface vibration signal sequence; The main control unit is also used to detect the impedance of the main line; the main line impedance is the impedance of the upstream main line or the impedance of the downstream main line; The digital transmission unit is also used to transmit the main line impedance and the updated surface vibration signal sequence through the second core pair of the uplink main line; the data transmission direction in the second core pair of the downlink main line and the second core pair of the uplink main line is from the acquisition station to the host system.

4. The shieldable collection station according to claim 3, characterized in that: The collection device also includes: Power supply unit; The high voltage coils of the multiple transformers are also connected to the positive or negative pole of the power supply unit; the data transmission direction of the wire core pairs corresponding to different transformers connected to the same electrode of the power supply unit is the same; the data transmission direction of the wire core pairs corresponding to the transformers connected to different electrodes in the power supply unit is different; the electrode is the positive or negative pole; The power supply unit is connected to the digital transmission unit, the main control unit and the acquisition unit respectively; the power supply unit is used to perform DC-DC conversion on the high-level voltage transmitted by the acquisition station line, and obtain a low-level voltage which is transmitted to the digital transmission unit, the main control unit and the acquisition unit respectively.

5. A wired telemetry seismograph, characterized in that: Wired telemetry seismographs, including Host system, multiple crossover stations, multiple field collection lines and multiple power supply stations; Each field collection line is connected to the host system through a cross station; the cross station corresponds to the field collection line one by one; each field collection line is connected to multiple power stations; multiple cross stations are connected in series through cross lines; Each field collection line includes a plurality of shieldable collection stations according to any one of claims 1 to 4 connected in series; The host system is used to determine the position serial number of the shieldable collection station in the shielding state according to the impedance of multiple lines; the position serial numbers of all shieldable collection stations in the same field collection line increase in sequence according to the instruction transmission direction; The host system is also used to update the collection sequence number of each shieldable collection station when the state of any shieldable collection station changes; the collection sequence numbers of all shieldable collection stations in the non-shielded state in the same field collection line increase in sequence according to the instruction transmission direction; only the shieldable collection stations in the non-shielded state have collection sequence numbers.

6. A method for determining the state of a collection station, characterized in that: The method is applied to the wired telemetry seismograph as claimed in claim 5, the method comprising: Get multiple large line impedances; The position serial numbers of the shieldable collection stations in the shielding state are determined according to the impedances of multiple lines; the position serial numbers of all the shieldable collection stations in the same field collection line are increased in sequence according to the instruction transmission direction.

7. The method for determining the state of a collection station according to claim 6, characterized in that: The position sequence number of the shieldable acquisition station in the shielding state is determined according to multiple large line impedances, specifically including: Get any large line impedance as the current large line impedance; Determine whether the current main line impedance is greater than an impedance threshold, and obtain a first determination result; If the first judgment result is yes, then obtain the upper end position serial number and the lower end position serial number; the upper end position serial number is the position serial number of the shieldable acquisition station located at the two ends of the large line corresponding to the current large line impedance, which is closer to the host system; the lower end position serial number is the position serial number of the shieldable acquisition station located at the two ends of the large line corresponding to the current large line impedance, which is farther away from the host system; the two shieldable acquisition stations located at the two ends of the large line corresponding to the current large line impedance are both in a non-shielded state; The state of the shieldable collection station whose position number is greater than the upper position number and lower than the lower position number on the field collection line corresponding to the current line impedance is determined as the shielding state; Determine the position serial number of the shieldable collection station in the shielding state as the shielding position serial number; If the first judgment result is no, the current large line impedance is updated and the process returns to the step of "judging whether the current large line impedance is greater than the impedance threshold to obtain the first judgment result".

8. The method for determining the state of a collection station according to claim 6, characterized in that: After determining the position sequence number of the shieldable acquisition station in the shielding state according to the plurality of large line impedances, the method further includes: Determine any field collection line as the current field collection line; Determine the shieldable collection station with position number 1 in the current field collection line as the current shieldable collection station; Determine whether the state of the current shieldable collection station has changed, and obtain a second determination result; If the second judgment result is yes, the collection sequence number of the current shieldable collection station is updated, and the shieldable collection station corresponding to the next position sequence number is used as the current shieldable collection station, and the step of "determining whether the state of the current shieldable collection station has changed to obtain the second judgment result" is returned until all the position sequences on the current field collection line are traversed; the collection sequence numbers of all shieldable collection stations in the non-shielded state in the same field collection line are increased in sequence according to the instruction transmission direction; only the shieldable collection station in the non-shielded state has a collection sequence number; If the second judgment result is no, the shieldable collection station corresponding to the next position number is used as the current shieldable collection station, and the process returns to the step of "determining whether the state of the current shieldable collection station has changed to obtain the second judgment result" until all the position numbers on the current field collection line are traversed; Update the current field collection line and return to step "determine the shieldable collection station with position number 1 in the current field collection line as the current shieldable collection station" until all field collection lines are traversed.

9. The method for determining the state of a collection station according to claim 8, characterized in that: Update the collection sequence number of the currently shieldable collection station, including: Determine whether there is a shieldable collection station in a non-shielded state before the current shieldable collection station, and obtain a third determination result; If the third judgment result is yes, then updating the collection sequence number of the current shieldable collection station and each shieldable collection station after the current shieldable collection station; If the third judgment result is no, the collection sequence number of the current shieldable collection station is set to 0, and the collection sequence number of the current shieldable collection station and each shieldable collection station after the current shieldable collection station is updated; Update the collection sequence number of the current shieldable collection station and each shieldable collection station after the current shieldable collection station, including: When the current shieldable collection station changes from the shielded state to the non-shielded state, the value of the collection sequence number of the previous shieldable collection station in the non-shielded state is increased by 1 as the collection signal of the current shieldable collection station, and the value of the collection sequence number of each shieldable collection station in the non-shielded state after the current shieldable collection station is increased by 1; When the current shieldable acquisition station changes from a non-shielded state to a shielded state, the acquisition signal of the current shieldable acquisition station is deleted, and the acquisition sequence number of each shieldable acquisition station in a non-shielded state after the current shieldable acquisition station is reduced by 1.

Images