CN101984365A - Micro-electromechanical digital geophone communication system and method - Google Patents
Micro-electromechanical digital geophone communication system and method Download PDFInfo
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Abstract
The invention provides a micro-electromechanical digital geophone communication system which belongs to the field of data communication. The micro-electromechanical digital geophone communication system comprises an uplink data channel and a downlink data channel, adopts an existing commercial device FPGA with low power consumption and low cost and can realize data transmission with low power consumption and high speed through the design of a logic and sequential circuit, solve the data transmission problem under complex terrains, such as rivers, forests, cliffs and the like during seismic exploration, reduce the construction strength and improve the working efficiency. The micro-electromechanical digital geophone communication system, a micro-electromechanical digital wave detection and a central data recording and processing unit jointly constitute a complete micro-electromechanical seismic data acquisition system.
Description
Technical field
The invention belongs to the data communication field, be specifically related to be used for a kind of micro electronmechanical digital geophone communication system of geophysical survey.
Background technology
Since nineteen twenty-six reflection survey since petroleum prospecting is used, seismic prospecting is a technology with fastest developing speed in the geophysical survey, is to seek the most frequently used, the most effective method of exploration of subsurface investigation in oil, coal and the engineering construction.Seismic prospecting instrument is an equipment the most accurate and crucial in the geophysical survey equipment, and it is closely bound up with modern advanced scientific technological advance.From the exciting of seismic event, collection, data processing, record drawing and all belong to the seismic prospecting instrument programme area, and the technical merit of seismic prospecting instrument, performance index and effect all are directly connected to the geological effect of earthquake-capturing data.Therefore, the development of seismic prospecting instrument also just becomes the important component part of geophysical exploration technology progress.The development of seismic prospecting instrument is to be precondition and power producer with the development of seismic prospecting and demand; Directly restrict and promoting the development of seismic prospecting conversely again.
MEMS (MEMS (micro electro mechanical system)) new technology since last century Mo combines new and high technologies such as microelectronics, precision optical machinery, biochemistry and information processing, has microminiaturization, silicon and be main material, mechanical electric function admirable, characteristics such as integrated.And currently have only French CGG company and American I/O company to produce digital geophone and acquisition system thereof in the world based on the MEMS acceleration transducer, still, the communicating circuit of digital geophone and communications protocol all are its proprietary technologies, and be outwards open.Large-scale seismic prospecting instrument with the form development of specialized equipment, also has only manufacturing enterprise of several family always in the world, and digital seismograph both domestic and external market is controlled by CGG/Sercel company substantially, seismic prospecting instrument 100% dependence on import of China.
The development of large-scale seismic prospecting instrument has been experienced very tortuous road in China, but since the beginning of this century, China has strengthened the research and development of exploring equipment.Through effort in a few years, the research and development of internal microcomputer electricity (MEMS) sensor have obtained progress, the results showed, internal microcomputer electricity (MEMS) sensor can be made digital geophone, contentedly the needs of seismic exploration.But, because foundation is weak is started late in the research and development of internal microcomputer electricity wave detector, especially data transmission problems, the contradiction of transfer rate and power consumption does not solve fully, and the research and development unit oneself carries out small-scale test, does not form ripe micro electronmechanical digital geophone data acquisition system (DAS).Because the singularity of ground observation, the power supply of all data acquisition equipments and wave detector is all provided by battery in the exploration construction, this just requires the power consumption of all collecting devices and wave detector all very low, thereby just can not use the communication device of two-forty, high power consumption.Offshore company has researched and developed themselves the higher communication chip of the relatively low speed of power consumption by making great efforts for many years, and still, for commercial object, they do not announce the data of chip to the external world, the domestic communication chip development communication system that also just can not use them.
Summary of the invention
The objective of the invention is to solve a difficult problem that exists in the above-mentioned prior art, a kind of micro electronmechanical digital geophone communication system is provided, with between micro electronmechanical digital geophone and the micro electronmechanical digital geophone, between micro electronmechanical digital geophone and the micro electronmechanical digital geophone management station, couple together between micro electronmechanical digital geophone management station and the central record processing unit, realize the mutual transmission of central record processing unit and micro electronmechanical digital geophone data and order, form micro electronmechanical digital geophone data acquisition system (DAS).
The present invention is achieved by the following technical solutions:
A kind of micro electronmechanical digital geophone communication system comprises downlink data channel and upstream data passage;
Described downlink data channel comprises that signal input circuit, reception data control circuit, downlink data output control circuit, output driving circuit, descending control module, timing control module, order receive comparison module, wherein,
Order receives comparison module: be used for discerning receiving data, whether decision needs this wave detector host receiving data;
Descending control module: according to the order of micro electronmechanical digital geophone management station, whether decision directly sends to the data that receive next stage wave detector or micro electronmechanical digital geophone management station, still sends order downwards by this wave detector;
Timing control module: be used to order to receive the comparison module timing, for it provides reset signal;
Signal input circuit receives the order of micro electronmechanical digital geophone management station or upper level wave detector, input signal is connected respectively to receive data control circuit, downlink data output control circuit, order reception comparison module then; Order receives the control that comparison module is subjected to the timing control module; Descending control module is connected with the downlink data output control circuit with timing control module, order reception comparison module, reception data control circuit by circuit respectively; Output driving circuit is connected with data output control circuit;
Described upstream data passage comprises input driving circuit, upstream data output control circuit composition, upload control module, Data Receiving counting module, data comparison module, up output driving circuit, wherein,
The upload control module: the data that control is uploaded are sent by this wave detector or are uploaded by next stage micro electronmechanical digital geophone management station or next stage wave detector;
Data comparison module: reset to up control module transmission information with to data count pick up module according to the data comparative result;
Data Receiving counting module:, then the data that receive are passed to data comparison module to data counts and the timing that receives;
Described input driving circuit passes to Data Receiving counting module and upstream data output control circuit respectively with data-signal; The upload control module is connected with the upstream data output control circuit with data comparison module by circuit respectively, and up output driving circuit is connected with the upstream data output control circuit.
When described upstream data passage and downlink data channel is used between micro electronmechanical digital geophone and the micro electronmechanical digital geophone, between micro electronmechanical digital geophone and the micro electronmechanical digital geophone management station time, described upload control module and descending control module are controlled by micro electronmechanical digital geophone master controller;
When described upstream data passage and downlink data channel were used between micro electronmechanical digital geophone management station and the central record processing unit, described upload control module and descending control module were controlled by the communication controller of micro electronmechanical digital geophone management station.
Communications protocol between described micro electronmechanical digital geophone central record disposal system and the micro electronmechanical digital geophone management station adopts TCP/IP procotol or asynchronous serial communication agreement; Communications protocol between micro electronmechanical digital geophone management station and the micro electronmechanical digital geophone adopts the asynchronous serial communication agreement; Communications protocol between the micro electronmechanical digital geophone adopts the asynchronous serial communication agreement.
Data transmission cable, optical fiber or the wireless FSO of light are adopted in connection between the described micro electronmechanical digital geophone; Adopt optical fiber, wireless, the wireless FSO of light or grid line being connected between micro electronmechanical digital geophone and the micro electronmechanical wave detector management station; Adopt optical fiber, wireless, the wireless FSO of light or grid line being connected between central record processing unit and the micro electronmechanical digital geophone management station.Make and use up wireless FSO communication, have bandwidth, set up conveniently, do not need to apply for frequency, non-interfering characteristics, be applicable to that can see and can not go directly or the connection between inconvenient 2 at 2; Optical fiber is applicable to 2 connections between 2 of far can not see again; Wireless 2 connections that are applicable to that data volume is less; Data transmission cable be applicable between the micro electronmechanical digital geophone and its with micro electronmechanical digital geophone management station between normal the connection.
The present invention adopts low-power consumption, low-cost existing commercial devices FPGA (field programmable gate array), by the design of logic and sequential circuit, upstream data output control circuit, Data Receiving counting module, data comparison module that the reception data control circuit in the micro electronmechanical digital geophone downlink data channel, downlink data output control circuit, timing control module, order are received in comparison module and the upstream data passage are integrated on the field programmable gate array (FP6A).
Use a kind of method of described micro electronmechanical digital geophone communication system, in the described method: the input and output logical relation of described downlink data output control circuit is:
Wherein: TDOWN represents the data of wave detector output control circuit at the corresponding levels to next stage output,
CONTROLDOWN represents downgoing control signal,
TXD1 represents the data of wave detector master controller output at the corresponding levels;
RUP represents the data that management station or upper level wave detector transmit;
The downlink data channel state has two kinds, is respectively data pass-through state and this machine transmit status; Wherein, the data pass-through state is that control bit CONTROLDOWN is set to low level; This machine transmit status is that control bit CONTROLDOWN is set to high level; The order that will carry out that micro electronmechanical digital geophone master controller is received is depended in the setting of control bit CONTROLDOWN;
The input and output logical relation of described upstream data output control circuit is:
Wherein: TUP represents the data of wave detector output control circuit at the corresponding levels to upper level output,
CONTROLUP represents uplink control signal,
TXD2 represents the data of wave detector master controller output at the corresponding levels,
RDWN represents the data that the next stage wave detector sends;
The upstream data channel status has two kinds, is respectively data pass-through state and this machine transmit status; Wherein, the data pass-through state is that control bit CONTROLUP is set to low level; This machine transmit status is that control bit CONTROLUP is set to high level.The order that will carry out that micro electronmechanical digital geophone master controller is received is depended in the setting of control bit CONTROLUP;
The step of described method is: behind the electrification reset, the master controller of micro electronmechanical digital geophone carries out initialization to all communicating circuits, downlink data channel and upstream data passage all are set to this machine transmit status, wait for the order data of management station or upper level wave detector, according to the order that receives, the state of data transmission channel is set, carry out then automatic identification of micro electronmechanical digital geophone and ordered steps or earthquake-capturing data step by step relay upload step.
Wherein, automatic identification of described micro electronmechanical digital geophone and ordered steps comprise:
(1) electrification reset;
(2) control bit CONTROLDOWN, CONTROLUP all are set to high level;
(3) carry out pile No. and detect,,, then change step (9) over to if do not detect pile No. if the pile No. of detecting then changes step (4) over to;
(4) store the logic number of receiving;
(5) upwards send this machine factory serial number and this machine logic number;
(6) judged whether the host acknowledgement order,, then changed step (7) over to,, then changed step (10) over to if do not have if having;
(7) judge whether the host acknowledgement order is correct,, then control bit CONTROLDOWN, CONTROLUP all are set to low level if correct;
(8) finish.
(9) judge whether reach time delay,, then change step (8) over to,, then return step (3) if do not reach if reach;
(10) judge whether reach time delay,, then change step (8) over to,, then return step (6) if do not reach if reach.
Described earthquake-capturing data relay are step by step uploaded step and are comprised:
(1) electrification reset;
(2) judge whether this machine is last, if then control bit CONTROLDOWN is set to low level, CONTROLUP is set to high level, postpone to send a frame image data behind the 10us, change step (6) then over to; If not, then control bit CONTROLDOWN, CONTROLUP all are set to low level, change step (3) then over to;
(3) judge whether next stage sends and finish, finish, then change step (5) over to,, then change step (4) over to if do not finish if send;
(4) judge whether reach time delay,, then change step (5) over to if arrive, if do not reach, step (3) then;
(5) control bit CONTROLDOWN is set to low level, and CONTROLUP is set to high level, sends a frame then and gathers number;
(6) then control bit CONTROLDOWN, CONTROLUP all are set to low level.
(7) finish.
Compared with prior art, the invention has the beneficial effects as follows:
(1) the present invention adopts low-power consumption, has commercial devices FPGA now cheaply, and this system has solved the transmission problem of data under the complex-terrains such as river, forest, steep cliff, has reduced the intensity of construction, has improved work efficiency;
(2) the present invention is an important component part of seismic acquisition configuration, form system for acquiring seismic data with wave detector, management station, central record with processing unit, for seismic prospecting provide reliably, efficiently, exploration means easily, can carry out field data collection, reduce cost.Wherein, communication speed between the micro electronmechanical digital geophone: 8Mbps, communication speed: 8Mbps between micro electronmechanical digital geophone and the micro electronmechanical digital geophone management station, communication speed between micro electronmechanical digital geophone management station and the central record processing unit: 10Mbps, when the 1ms sampling interval, 150 roads can real-time Transmission.
Description of drawings
Fig. 1 is the micro electronmechanical digital geophone communication system of a present invention synoptic diagram.
Fig. 2 is a micro electronmechanical digital geophone down going channel circuit diagram among the present invention.
Fig. 3 is a micro electronmechanical digital geophone data feedback channel circuit diagram among the present invention.
Fig. 4 be among the present invention the earthquake-capturing data step by step relay upload the step block diagram of data
Fig. 5 is the step block diagram that wave detector is discerned and sorted automatically among the present invention.
Fig. 6 is the workflow diagram of the micro electronmechanical digital geophone communication system of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Micro electronmechanical digital geophone data acquisition system (DAS) synoptic diagram as shown in Figure 1.Micro electronmechanical digital geophone data acquisition system (DAS) is made up of the micro electronmechanical digital geophone of a micro electronmechanical digital geophone central record disposal system, group management station, one group of micro electronmechanical digital geophone.In the micro electronmechanical digital geophone data acquisition system (DAS) of a cover, have only a central record disposal system, but a plurality of micro electronmechanical digital geophone management station can be arranged, each micro electronmechanical digital geophone management station is 96 micro electronmechanical digital geophones of management at most.Wherein the micro electronmechanical digital geophone of each management station's management all is connected in series, and the connection between the management station can be serial, also can walk abreast, and has only provided mode connected in series among Fig. 1.Specifically,
(1) micro electronmechanical digital geophone central record disposal system
Micro electronmechanical digital geophone central record disposal system mainly is made up of interface in microcomputer, thermal printer, plotting apparatus, central controller, wireless data transmission module, GPS, network interface, the photoelectricity etc., have management functions such as data storage, processing, demonstration, man-machine conversation, be responsible for the control and the detection of total system.Main website sends various steering orders by data transmission, to digital seismic signal write down, layout and management.The major control function is as follows:
1) reads the data of collection by intersection management station, and store magnetic tape station into required record format;
2) setting of acquisition parameter, as: sampling interval, preamplification gain, record length, highly cut, lowly cut, trap etc.;
3) monitoring of wave detector;
4) printing of the demonstration of acquisition parameter, playback and monitor record;
5) real-time management of ground arrangement;
6) setting of display parameter;
7) setting of systematic parameter;
8) the automatic generation of class's newspaper;
9) control of blaster.
Can carry out the communication of two kinds of communications protocol between micro electronmechanical digital geophone central record disposal system and the micro electronmechanical digital geophone management station: TCP/IP procotol and asynchronous serial communication agreement, hardware interface comprises optical fiber, wireless, the wireless FSO of light, network RJ interface, can according to field condition select optical fiber, wireless digital broadcasting station, light wireless FSO, standard network data transmission cable connect when constructing in the open air.
(2) micro electronmechanical digital geophone management station
Micro electronmechanical digital geophone management station is an important component part of data acquisition system (DAS), both can receive the main website order manages and monitors the digital geophone that is connected to this station, also can oneself separately micro electronmechanical digital geophone be detected, simultaneously can also make relaying, arrange when conveniently complex area being explored and arrange.Each management station can 1 to 96 micro electronmechanical digital geophone of connection management, is cascade between the digital geophone.
Micro electronmechanical digital geophone management station mainly is made up of central controller, data-carrier store, program storage, digital geophone power management module, wireless data transmission module, wire communication module and driving circuit, phase lock circuitry, serial input eeprom memory etc.Major function has:
1) receives the main website instruction, digital geophone is controlled and detected;
2) administering digital wave detector power supply is according to the instruction startup of main website and powering up of cancellation digital geophone;
3) data that digital geophone transmits are read in the data acquisition and the transmission of startup digital geophone, upload data to main website.
Adopt the asynchronous serial communication agreement between micro electronmechanical digital geophone management station and the micro electronmechanical digital geophone, hardware interface comprises optical fiber, wireless, the wireless FSO of light, data transmission cable, can according to field condition select optical fiber, wireless digital broadcasting station, light wireless FSO, data transmission cable connect when constructing in the open air.
(3) micro electronmechanical digital geophone
Micro electronmechanical digital geophone has most of function of early earthquake instrument, detects vibration signal, and detected conversion of signals is become digital signal, is delivered to management station.Micro electronmechanical digital geophone mainly by controller, MEMS acceleration transducer, precedingly put, A/D conversion, communication module, power management module, supply module etc. form, major function is to detect vibration signal, detected conversion of signals is become digital signal, be delivered to management station.
Adopt the asynchronous serial communication agreement between the micro electronmechanical digital geophone, hardware interface comprises optical fiber, wireless, the wireless FSO of light, data transmission cable, can according to field condition select optical fiber, wireless digital broadcasting station, light wireless FSO, data transmission cable connect when constructing in the open air.
In the research of micro electronmechanical digital geophone acquisition system, the content of main research comprises data communication system, data acquisition unit, MEMS sensor, MEMS power supply and management thereof.Require data transmission rate, low-power consumption, low cost.External major company drops into a large amount of manpower and financial resources, develops special communication device, and after succeeding in developing, its data is holded in close confidence, and other people can't know.Adopt the FPGA of high integration, low-power consumption among the present invention, designed a kind of micro electronmechanical digital geophone communication system, it is with between micro electronmechanical digital geophone and the micro electronmechanical digital geophone, between micro electronmechanical digital geophone and the micro electronmechanical digital geophone management station, couple together between micro electronmechanical digital geophone management station and the central record processing unit, realize function, satisfied the needs of communication system.
A kind of micro electronmechanical digital geophone communication system of the present invention comprises down going channel and data feedback channel, wherein:
1) micro electronmechanical digital geophone down going channel circuit diagram as shown in Figure 2.Mainly be micro electronmechanical digital geophone master controller (M00), timing control module (M23), order reception comparison module (M24) to be formed by signal input circuit (U21), reception data control circuit (U22), downlink data output control circuit (U23, U24, U25, U26), output driving circuit (U27), descending control module.
Signal input circuit (U21) receives the order of micro electronmechanical digital geophone management station or upper level wave detector, interface has photoelectric commutator interface, wireless data transmission module interface, data transmission cable interface, wherein the data transmission cable interface adopts the input of LVDS difference, and other adopts the single-ended signal input mode.U21 sends input signal respectively to and receives data control circuit (U22), downlink data output control circuit (U23, U24, U25, U26) and order reception comparison module (M24).
Timing control module (M23) is used to order to receive comparison module (M24) timing, and provides reset signal for it.When order reception comparison module (M24) detects our station order or broadcasting command, open data channel, allow the data of upper level to enter master controller (M00), carry out order accordingly by master controller (M00); Otherwise this wave detector does not receive data.Like this, can reduce the response of master controller ARM, energy savings.Order receives the control that comparison module (M24) is subjected to timing control module (M23).When data were come, order received comparison module (M24) and sends a signal to timing control module (M23), and timing control module (M23) picks up counting.When overtime, at once order is received comparison module (M24) and reset, allow it receive data again.
Micro electronmechanical digital geophone master controller (M00) is the core of micro electronmechanical digital geophone, carries out the order of management station, and replys corresponding information and data to management station.
Downlink data output control circuit (U23, U24, U25, U26) is subjected to the control of micro electronmechanical digital geophone master controller (M00), opens or cut off downlink data channel according to the order of management station.
The effect of the effect of output driving circuit (U27) and signal input circuit (U21) is opposite, and signal is exported.Output interface has photoelectric commutator interface, wireless data transmission module interface, data transmission cable interface, and wherein the data transmission cable interface adopts LVDS output differential electric signal, and other adopts the single-ended signal input mode.
Downlink data output control circuit input and output logical relation is:
Wherein: TDOWN represents the data of wave detector output control circuit at the corresponding levels to next stage output, and CONTROLDOWN represents downgoing control signal,
TXD1 represents the data of wave detector master controller output at the corresponding levels,
RUP represents the data that management station or upper level wave detector transmit.
2) micro electronmechanical digital geophone data feedback channel circuit diagram as shown in Figure 3.By input driving circuit (U31), upstream data output control circuit (U32, U33, U34, U35) form, the upload control module is micro electronmechanical digital geophone master controller (M00), Data Receiving counting module (M32), data comparison module (M33), up output driving circuit (U36) are formed.
The input driving circuit of upstream data passage (U31) function is identical with the signal input circuit (U21) of down going channel, interface is also identical, and difference is that input driving circuit (U31) is that data-signal is passed to Data Receiving counting module (M32) and up output driving circuit (U36) respectively.
Data counts and the timing of Data Receiving counting module (M32) to receiving.When receiving the numerical value of setting, the data that receive are delivered to data comparison module (M33) compare.If sending, the data of next stage finish, reseting data count pick up module (M32) then, notify micro electronmechanical digital geophone master controller (M00), switch, send the data that this wave detector is gathered to management station by micro electronmechanical digital geophone master controller (M00).Otherwise data comparison module (M33) is restarted work.The effect of upstream data output control circuit (U32, U33, U34, U35) is opposite with the effect of input driving circuit (U31), is that signal is exported.Output interface has photoelectric commutator interface, wireless data transmission module interface, data transmission cable interface, and wherein the data transmission cable interface adopts LVDS output differential electric signal, and other adopts the single-ended signal input mode.
Upstream data output control circuit input and output logical relation is:
Wherein: TUP represents the data of wave detector output control circuit at the corresponding levels to upper level output, and CONTROLUP represents uplink control signal,
TXD2 represents the data of wave detector master controller output at the corresponding levels,
RDWN represents the data that the next stage wave detector sends.
Fig. 2, Fig. 3 has only provided when described upstream data passage and downlink data channel and has been used between micro electronmechanical digital geophone and the micro electronmechanical digital geophone, synoptic diagram in the time of between micro electronmechanical digital geophone and the micro electronmechanical digital geophone management station, when described upstream data passage and downlink data channel are used between micro electronmechanical digital geophone management station and the central record processing unit, described upload control module and descending control module are controlled by the communication controller of micro electronmechanical digital geophone management station, only need Fig. 2, the communication controller that micro electronmechanical digital geophone master controller (M00) among Fig. 3 is replaced by micro electronmechanical digital geophone management station can be realized.
The course of work of the present invention is as shown in Figure 6: behind the electrification reset, micro electronmechanical digital geophone master controller carries out initialization to all communicating circuits, downlink data channel and upstream data passage all are set to this machine transmit status, wait for the order data of management station or upper level wave detector, according to the order that receives, the state of data transmission channel is set, carry out automatic identification of micro electronmechanical digital geophone and ordered steps or earthquake-capturing data step by step relay upload step.
The downlink data channel state has two kinds: straight-through and this machine transmission of data.The downlink data channel pass-through state is that control bit CONTROLDOWN is set to low level, and according to logical relation (1) as can be known, the data of following biography are exactly the data of receiving, and the data mask of this machine transmission; This machine transmit status is that control bit CONTROLDOWN is set to high level, and according to logical relation (1) as can be known, the data that send are that this machine sends downwards, and the next data mask of upper level.The order that will carry out that micro electronmechanical digital geophone master controller is received is depended in the setting of control bit CONTROLDOWN.
The upstream data channel status also has two kinds: straight-through and this machine transmission of data.Upstream data passage pass-through state is that control bit CONTROLUP is set to low level, and according to logical relation (2) as can be known, the data of uploading are exactly the data of coming from next stage, and the transmission data mask of this machine; This machine transmit status is that control bit CONTROLUP is set to high level, and according to logical relation (2) as can be known, downwards the data that send are that this machine sends, and the data mask that next stage is transmitted.The order that will carry out that micro electronmechanical digital geophone master controller is received is depended in the setting of control bit CONTROLUP.
The combination of downlink data output control circuit and upstream data output control circuit by software control, realizes automatic identification of micro electronmechanical digital geophone and ordering and the earthquake-capturing data function uploaded of relay step by step.Implementation method is as follows:
1. micro electronmechanical digital geophone is discerned automatically and ordering realizes by control downlink data output control circuit (U23, U24, U25, U26) and upstream data output control circuit (U32, U33, U34, U35).Identify the relative position of wave detector, can determine the pile No. of wave detector correspondence, the block diagram of performing step is as shown in Figure 5, and is specific as follows:
(1) electrification reset;
(2) control bit CONTROLDOWN, CONTROLUP all are set to high level;
(3) carry out pile No. and detect,,, then change step (9) over to if do not detect pile No. if the pile No. of detecting then changes step (4) over to;
(4) store the logic number of receiving;
(5) upwards send this machine factory serial number and this machine logic number;
(6) judged whether the host acknowledgement order,, then changed step (7) over to,, then changed step (10) over to if do not have if having;
(7) judge whether the host acknowledgement order is correct,, then control bit CONTROLDOWN, CONTROLUP all are set to low level if correct;
(8) finish.
(9) judge whether reach time delay,, then change step (8) over to,, then return step (3) if do not reach if reach;
(10) judge whether reach time delay,, then change step (8) over to,, then return step (6) if do not reach if reach.
2. micro electronmechanical digital geophone earthquake-capturing data relay are step by step uploaded by software control downlink data output control circuit (U23, U24, U25, U26) and upstream data output control circuit (U32, U33, U34, U35) and are realized.Reduce reciprocal process, save time, improve transfer efficiency, the block diagram of performing step is as shown in Figure 4, and is specific as follows:
(1) electrification reset;
(2) judge whether this machine is last, if then control bit CONTROLDOWN is set to low level, CONTROLUP is set to high level, postpone to send a frame image data behind the 10us, change step (6) then over to; If not, then control bit CONTROLDOWN, CONTROLUP all are set to low level, change step (3) then over to;
(3) judge whether next stage sends and finish, finish, then change step (5) over to,, then change step (4) over to if do not finish if send;
(4) judge whether reach time delay,, then change step (5) over to if arrive, if do not reach, step (3) then;
(5) control bit CONTROLDOWN is set to low level, and CONTROLUP is set to high level, sends a frame then and gathers number;
(6) then control bit CONTROLDOWN, CONTROLUP all are set to low level.
(7) finish.
Every grade of transmission drive, a signal attenuation difficult problem when having solved long Distance Transmission.The uplink and downlink data, during through every grade of wave detector, all carry out the reception and the transmission of hardware, be equivalent to signal and through every grade of wave detector the time, isolate, no longer directly link to each other, the signal attenuation and the shortcoming of mutual interference mutually when having avoided the bus structure middle and long distance, simultaneously signal is driven again, strengthened signal, the attenuation problem of signal when having overcome transmission, reduce the bit error rate of transmission, made signal transmission distance longer.
Receive upstream data output control circuit (U32, U33, U34, U35), Data Receiving counting module (M32), data comparison module (M33) in data control circuit (U22), downlink data output control circuit (U23, U24, U25, U26), timing control module (M23), order reception comparison module (M24) and the upstream data passage in the micro electronmechanical digital geophone downlink data channel, these are all concentrated among the FPGA by the present invention.Utilize the present invention, developed the small-sized data acquisition system (DAS) of a cover, carried out field test, obtained open-air real data.
Technique scheme is one embodiment of the present invention, for those skilled in the art, on the basis that the invention discloses application process and principle, be easy to make various types of improvement or distortion, and be not limited only to the described method of the above-mentioned embodiment of the present invention, therefore previously described mode is preferably, and does not have restrictive meaning.
Claims (7)
1. micro electronmechanical digital geophone communication system, be used for micro electronmechanical digital geophone data acquisition system (DAS), micro electronmechanical digital geophone data acquisition system (DAS) is made up of the micro electronmechanical digital geophone of a micro electronmechanical digital geophone central record disposal system, group management station, one group of micro electronmechanical digital geophone.Wherein, micro electronmechanical digital geophone central record disposal system manages each micro electronmechanical digital geophone management station, between each micro electronmechanical digital geophone of each micro electronmechanical digital geophone management station management all is connected in series, and is connected in series or parallel the connection between each micro electronmechanical digital geophone management station; Described micro electronmechanical digital geophone communication system be used between micro electronmechanical digital geophone and the micro electronmechanical digital geophone, the communication between micro electronmechanical digital geophone and the micro electronmechanical digital geophone management station, between micro electronmechanical digital geophone management station and the central record processing unit; It is characterized in that: described micro electronmechanical digital geophone communication system comprises downlink data channel and upstream data passage;
Described downlink data channel comprises that signal input circuit, reception data control circuit, downlink data output control circuit, output driving circuit, descending control module, timing control module, order receive comparison module, wherein,
Order receives comparison module: be used for discerning receiving data, whether decision needs this wave detector host receiving data;
Descending control module: according to the order of micro electronmechanical digital geophone management station, whether decision directly sends to the data that receive next stage wave detector or micro electronmechanical digital geophone management station, still sends order downwards by this wave detector;
Timing control module: be used to order to receive the comparison module timing, for it provides reset signal;
Signal input circuit receives the order of micro electronmechanical digital geophone management station or upper level wave detector, input signal is connected respectively to receive data control circuit, downlink data output control circuit, order reception comparison module then; Order receives the control that comparison module is subjected to the timing control module; Descending control module is connected with the downlink data output control circuit with timing control module, order reception comparison module, reception data control circuit by circuit respectively; Output driving circuit is connected with data output control circuit;
Described upstream data passage comprises input driving circuit, upstream data output control circuit composition, upload control module, Data Receiving counting module, data comparison module, up output driving circuit, wherein,
The upload control module: the data that control is uploaded are sent by this wave detector or are uploaded by next stage micro electronmechanical digital geophone management station or next stage wave detector;
Data comparison module: reset to up control module transmission information with to data count pick up module according to the data comparative result;
Data Receiving counting module:, then the data that receive are passed to data comparison module to data counts and the timing that receives;
Described input driving circuit passes to Data Receiving counting module and upstream data output control circuit respectively with data-signal; The upload control module is connected with the upstream data output control circuit with data comparison module by circuit respectively, and up output driving circuit is connected with the upstream data output control circuit.
2. micro electronmechanical digital geophone communication system according to claim 1 is characterized in that:
When described upstream data passage and downlink data channel is used between micro electronmechanical digital geophone and the micro electronmechanical digital geophone, between micro electronmechanical digital geophone and the micro electronmechanical digital geophone management station time, described upload control module and descending control module are controlled by micro electronmechanical digital geophone master controller;
When described upstream data passage and downlink data channel were used between micro electronmechanical digital geophone management station and the central record processing unit, described upload control module and descending control module were controlled by the communication controller of micro electronmechanical digital geophone management station.
3. micro electronmechanical digital geophone communication system according to claim 1 and 2 is characterized in that: data transmission cable, optical fiber or the wireless FSO of light are adopted in the connection between the described micro electronmechanical digital geophone; Adopt optical fiber, wireless, the wireless FSO of light or grid line being connected between micro electronmechanical digital geophone and the micro electronmechanical wave detector management station; Adopt optical fiber, wireless, the wireless FSO of light or grid line being connected between central record processing unit and the micro electronmechanical digital geophone management station.
4. micro electronmechanical digital geophone communication system according to claim 1 and 2 is characterized in that: upstream data output control circuit, Data Receiving counting module, data comparison module that the reception data control circuit in the micro electronmechanical digital geophone downlink data channel, downlink data output control circuit, timing control module, order receive in comparison module and the upstream data passage are integrated on the field programmable gate array (FPGA).
5. use the method for claim 1 or 2 described micro electronmechanical digital geophone communication systems, it is characterized in that: in the described method:
The input and output logical relation of described downlink data output control circuit is:
Wherein: TDOWN represents the data of wave detector output control circuit at the corresponding levels to next stage output,
CONTROLDOWN represents downgoing control signal,
TXD1 represents the data of wave detector master controller output at the corresponding levels;
RUP represents the data that management station or upper level wave detector transmit;
The downlink data channel state has two kinds, is respectively data pass-through state and this machine transmit status; Wherein, the data pass-through state is that control bit CONTROLDOWN is set to low level; This machine transmit status is that control bit CONTROLDOWN is set to high level; The order that will carry out that micro electronmechanical digital geophone master controller is received is depended in the setting of control bit CONTROLDOWN;
The input and output logical relation of described upstream data output control circuit is:
Wherein: TUP represents the data of wave detector output control circuit at the corresponding levels to upper level output,
CONTROLUP represents uplink control signal,
TXD2 represents the data of wave detector master controller output at the corresponding levels,
RDWN represents the data that the next stage wave detector sends;
The upstream data channel status has two kinds, is respectively data pass-through state and this machine transmit status; Wherein, the data pass-through state is that control bit CONTROLUP is set to low level; This machine transmit status is that control bit CONTROLUP is set to high level.The order that will carry out that micro electronmechanical digital geophone master controller is received is depended in the setting of control bit CONTROLUP;
The step of described method is: behind the electrification reset, the master controller of micro electronmechanical digital geophone carries out initialization to all communicating circuits, downlink data channel and upstream data passage all are set to this machine transmit status, wait for the order data of management station or upper level wave detector, according to the order that receives, the state of data transmission channel is set, carry out then automatic identification of micro electronmechanical digital geophone and ordered steps or earthquake-capturing data step by step relay upload step.
6. method according to claim 5 is characterized in that: described micro electronmechanical digital geophone discerns automatically and ordered steps comprises:
(1) electrification reset;
(2) control bit CONTROLDOWN, CONTROLUP all are set to high level;
(3) carry out pile No. and detect,,, then change step (9) over to if do not detect pile No. if the pile No. of detecting then changes step (4) over to;
(4) store the logic number of receiving;
(5) upwards send this machine factory serial number and this machine logic number;
(6) judged whether the host acknowledgement order,, then changed step (7) over to,, then changed step (10) over to if do not have if having;
(7) judge whether the host acknowledgement order is correct,, then control bit CONTROLDOWN, CONTROLUP all are set to low level if correct;
(8) finish.
(9) judge whether reach time delay,, then change step (8) over to,, then return step if do not reach if reach. (3);
(10) judge whether reach time delay,, then change step (8) over to,, then return step (6) if do not reach if reach.
7. method according to claim 5 is characterized in that: described earthquake-capturing data relay are step by step uploaded step and are comprised:
(1) electrification reset;
(2) judge whether this machine is last, if then control bit CONTROLDOWN is set to low level, CONTROLUP is set to high level, postpone to send a frame image data behind the 10us, change step (6) then over to; If not, then control bit CONTROLDOWN, CONTROLUP all are set to low level, change step (3) then over to;
(3) judge whether next stage sends and finish, finish, then change step (5) over to,, then change step (4) over to if do not finish if send;
(4) judge whether reach time delay,, then change step (5) over to if arrive, if do not reach, step (3) then;
(5) control bit CONTROLDOWN is set to low level, and CONTROLUP is set to high level, sends a frame then and gathers number;
(6) then control bit CONTROLDOWN, CONTROLUP all are set to low level
(7) finish.
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