CN101963675A - Multipath dynamically-reconfigurable signal processing system - Google Patents
Multipath dynamically-reconfigurable signal processing system Download PDFInfo
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- CN101963675A CN101963675A CN 201010263601 CN201010263601A CN101963675A CN 101963675 A CN101963675 A CN 101963675A CN 201010263601 CN201010263601 CN 201010263601 CN 201010263601 A CN201010263601 A CN 201010263601A CN 101963675 A CN101963675 A CN 101963675A
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Abstract
The invention discloses a multipath dynamically-reconfigurable signal processing system. The processing system consists of a dynamically-reconfigurable signal processing module and a main control module, wherein the dynamically-reconfigurable signal processing module is used for amplifying, filtering and performing signal distribution processing on the original signal; and the main control module is used for driving and controlling each processing unit of the dynamically-reconfigurable signal processing module to realize dynamical reconfigurability of the processing module. The processing system has the advantage of maximally guaranteeing the completeness of signals because the whole processing system adopts analog chips, and has the characteristics of simple control, a small number of occupied resources, high processing speed, high disturbance resisting capacity and high real-time property.
Description
Technical field
The present invention relates to engineering seismology signal data acquisition process field, but particularly a kind of multiple signals disposal system of high precision dynamic-configuration.
Background technology
Signal Processing is a vital link in the various data acquisition system (DAS)s.At engineering seismology signals collecting field mainly is to pick up effective seismic signal by rational signal condition measure, so that the processing in later stage and analysis, it is mainly reflected in the amplification of original seismic signal and filtering.
In the engineering seismology exploration, the focus that generally uses is man-made explosion, the seismic signal intensity of its generation a little less than, and it is more faint to make that seismic signal becomes after the propagation of the underground various media of process and the decay, in order to make the timely response signal collection of follow-up collecting unit, be necessary that seismic signal is carried out prime to be amplified, under certain actual field geology condition, different tectonic structures and environment, the intensity of the seismic signal that produces also has a great difference, for making that seismic signal can be by system acquisition under comparatively suitable intensity, the dynamic range that neither can surpass system, do not cause collecting unit can't collect useful signal in the undesired signal thereby also can not be submerged in because of seismic signal intensity is more weak, the Amplifier Gain value that these features all require to be adopted can realize dynamically adjusting;
Same because in the middle of the actual field data collection, the signal frequency that various geologic conditions and environment are produced is down disturbed different, and at different method of seismic prospecting, also be not quite similar as needed separately significant wave frequency ranges such as reflective wave method, refraction wave method, ground roll methods, therefore the interference wave frequency of required filtering also differs widely, and requires designed low pass, High Pass Filter Cutoff Frequency to carry out dynamic-configuration according to actual conditions thus.
A kind of undesired signal that must consider in the engineering seismology signal acquiring system simultaneously is the interference of 50Hz industrial frequency, relatively effective method is to adopt trapper, and effectively contain the signal of 50Hz frequency in the seismic signal in the middle of the practical application, so need to adopt measures necessary optionally to use trapper.
At the more traditional mode of the signal processing of system for acquiring seismic data mainly is to adopt various combinational circuits to realize, as the adjustable amplifier part mainly is to utilize resistor network and base amplifier to constitute floating point amplifier, filter segment wherein adopts resistance-capacitance network to finish equally, these implementation methods are difficult to satisfy desired function usually, the effect of handling is also relatively poor, very easily destroy the fidelity of original signal, make also simultaneously that the control of peripheral circuit is comparatively complicated, and need take the port resource of big amount controller; At present at the design of adjustable filter more advanced be to adopt digital filter, i.e. acquired signal under the situation of not considering to disturb, require to carry out corresponding digital filtering according to reality again, this mode is controlled easy, but owing to original signal is not handled before gathering, makes undesired signal be difficult to obtain compacting, and because the semaphore of being gathered is bigger, especially when multidiameter delay is handled, the calculating of digital filter and handle consuming time longlyer and destroys the integrality of signal easily.Therefore but a kind of analog signal processing system that controls the dynamic-configuration easy, that antijamming capability is strong, processing capability in real time is good becomes the key means that addresses these problems.
Summary of the invention
At the problems referred to above, the invention discloses dynamically configuration signal disposal system of a kind of multichannel, but each processing unit dynamic modulation in this system, and can guarantee the integrality of engineering seismology signal.
In order to reach above-mentioned effect, the present invention adopts following technical scheme: a kind of multichannel is the configuration signal disposal system dynamically, and this disposal system is by dynamically configuration signal processing module and main control module constitute;
Dynamically the configuration signal processing module is by four tunnel Programmable Gain Amplifier Circuit, signal is selected distributor circuit one, adjustable cutoff frequency low-pass filter, adjustable cutoff frequency Hi-pass filter, trapper, signal selects distributor circuit two to form, original signal is at first amplified through four tunnel Programmable Gain Amplifier Circuit, select distributor circuit one to be assigned as by signal again and flow into adjustable cutoff frequency low-pass filter, adjustable cutoff frequency Hi-pass filter, the signal of trapper and four kinds of flow directions of through connect signal flows to adjustable cutoff frequency low-pass filter, adjustable cutoff frequency Hi-pass filter, three road signals of trapper flow into signal once more with through connect signal after treatment and select distributor circuit two to select to distribute;
Main control module is used for the drive controlling to system's each processing unit programmable analog chip, and accepts from the various steering orders of the outside configuration parameter with real-time adjustment each processing unit.
Wherein, described signal selects distributor circuit one, two to select a data selector to realize function by four; The function of described trapper is a filtering 50Hz industrial frequency; And described master controller is among single-chip microcomputer, ARM, FPGA, the DSP any one; Each processing unit all adopts full simulation programmable chip in the last described dynamically configuration signal processing module; Be separate between each treatment channel in the described dynamically configuration signal processing module.
Principle of work of the present invention is: original signal is at first carried out undistorted amplification by the amplifier of specifying yield value, and then through input and output oppositely insert four select a data selector with signal allocation for flowing into low-pass filter, Hi-pass filter, the signal of trapper and four kinds of flow directions of through connect signal, each branch signal flows into the respective handling unit and carry out Filtering Processing under the specified configuration condition, flow into other one group four once more through three kinds of signals after the foregoing circuit combination conditioning and the through connect signal that do not add processing and select a data selector to carry out selective extraction, finally finish signal Processing.Wherein, adjustable cutoff frequency low pass and Hi-pass filter can be adjusted the cutoff frequency that is provided with in conjunction with external condition in operational process, and the adjustment of each several part parameter is finished by master control module controls in the entire process system.After the comprehensive above-mentioned processing can be with signal condition only through low-pass filter, simultaneously through low-pass filter and trapper, simultaneously through three kinds of wave filters, only through trapper, simultaneously through trapper and Hi-pass filter, only through Hi-pass filter and without the through connect signal of any wave filter, i.e. high-fidelity signal under seven kinds of tupes.
The invention has the beneficial effects as follows: but the present invention adopts full simulation programmable chip to be combined into the signal processing system of dynamic-configuration, amplifier gain value, filter cutoff frequency all can dynamically be adjusted in the processing unit, and select distribution network and main control module to realize that the multiple tupe of signal is optional in conjunction with corresponding signal, total system have control simple, take that resource is few, processing speed is fast, antijamming capability is strong, real-time is good, separate and characteristics that signal integrity is good between each treatment channel.
Description of drawings
Fig. 1 is a system architecture diagram of the present invention;
Fig. 2 is a preamplifier circuit schematic diagram able to programme;
Fig. 3 is adjustable cutoff frequency low-pass filter circuit theory diagrams;
Fig. 4 is the notch filter circuit schematic diagram;
Fig. 5 is adjustable cutoff frequency circuit of high pass filter schematic diagram;
Fig. 6 selects distribution network theory structure block diagram for signal;
Fig. 7 selects the distribution network circuit theory diagrams for signal.
Embodiment
For the easier quilt of the present invention is understood, the present invention will be further described below in conjunction with the drawings and specific embodiments.
Consult Fig. 2, a kind of multichannel is the configuration signal disposal system dynamically, this system is made up of configurable signal processing module and main control module, with the main control module is the control core of disposal system, and processed signal is transmitted to programmable amplifier 1 successively, signal selects distributor circuit 1, adjustable cutoff frequency low-pass filter 3, trapper 5, adjustable cutoff frequency Hi-pass filter 4, signal to select distributor circuit 26.Main control module 7 is dynamically adjusted the parameter of each unit in the configurable signal processing module.
Consult Fig. 2, can comparatively be picked up by system under the proper state for guaranteeing original signal, take into account high-fidelity, the low noise requirement of system simultaneously to processing module, the LTC6910-2 that system adopts volume and power consumption is all less, adopt SOT-23 to encapsulate realizes the preposition amplification to signal, it adopts tripod CMOS level to import the enlargement factor of control amplifier, this not only makes its control simple, and three-way mode of operation has also been saved the IO mouth resource of a large amount of MCU; Consider that LTC6910-2 is limited in input current ± 25mA, input/output terminal has inserted 0 Europe resistance and has prevented the excessive and defective chip of electric current in the practical application circuit; Simultaneously reduce to minimumly, inserted coupling capacitance at the feeder ear of its positive-negative power, to reduce power supply ripple for the ground wire that guarantees LTC6910-2 in the circuit disturbs.Can find out intuitively that by the parameter list of LTC6910-2 it is when the employing ± 5V dual power supply, has wideer signal input dynamic range, fully satisfy seismic signal and gathered requirement, its nominal input impedance simultaneously still keeps very low value when higher gain, and because effectively the frequency of seismic signal is lower, so can only insert 0 Europe resistance to stimulus part in the middle of the circuit design, do not need to add suitable capacitance and not adopt in the conventional amplifying circuit, guarantee that promptly amplifier self input impedance is much larger than the capacitive reactance of effective seismic signal through electric capacity, according to this requirement, also can't obtain the electric capacity that can satisfy this condition by calculating demonstration, this has also further verified the rationality of circuit design.
Consult Fig. 3, be similarly the adaptive system demand adjustable to low pass filter cutoff frequency, this part is mainly by MAX263, two---and eight scale-of-two frequency counter CD4024, high-speed analog switch MAX398 form combination and realize.Because the minimum output of CD4024 is two divided-frequency, so need the clock source signals of input 400kHz, sends into the feeder connection of MAX398 behind frequency division, the channel selecting output terminal is directly into MAX263.In order to make input signal amplitude have bigger dynamic range, the mode that MAX263 employings ± 5V powers in the middle of the practical application.Fully take into account the real-time of input clock signal, selected high-speed analog switch MAX398 control selector channel, its transmission delay maximum only is 575ns.
Pin coding schedule by MAX263 is observed f
Clk/ f
0Ratio be a variable quantity, and we design in the middle of cutoff frequency f
0Must be a variable quantity, if f is set again
ClkBe a variable quantity, promptly above-mentioned mode can't satisfy condition at all, can consider in this case to adopt f is set
Clk/ f
0Be certain value, f
0With f
ClkVariation and the mode that changes design.Concrete implementation is to choose one group of fixing F4～F0 and comparatively suitable encoded radio of Q6～Q0 respectively, reach the purpose of control filters cutoff frequency by the clock frequency of control MAX263 input, and the system clock part can only be the clock source that stable single-frequency is exported, effective method is to adopt the mode of frequency multiplication or frequency division and utilize high-speed analog switch to switch the selection input clock, when setting the pin encoded radio of clock frequency selection F4～F0, can use aspect two thus and consider, the one, determine the frequency of clock with suitable minimum code value, required clock source frequency promptly is set for minimum, utilize frequency multiplier to produce different clock frequencies then, the 2nd, determine with the suitable encoded radio of maximum, the clock source frequency of this moment is maximum suitable frequency, and then the utilization frequency divider produces various frequency signals.Take all factors into consideration the performance of wave filter and choosing of clock source, the design has selected back a kind of implementation method, can draw f by calculating
Clk/ f
0=194.78 is maximum suitable encoded radio, this moment clock frequency, f
Clk=194.78*1024=199.455kHz ≈ 200kHz is as cutoff frequency f
0During=32Hz, f
Clk=194.78*32=6232.96Hz.Because the actual input clock of wave filter is to produce behind the frequency division, satisfy the 200kHz frequency division to 6232.96Hz, must be through 32=2
5Therefore frequency division can select the scale-of-two frequency counter to realize.And take all factors into consideration performance of filter, select Q=8, i.e. Q6～Q0=1111000.Also can calculate wave filter thus and respectively end band connection frequency f under the centre frequency condition
p, stop-band frequency f
cValue.
High-quality power supply is vital to the filter effect of wave filter and the antijamming capability of total system, in the circuit each unit component power unit except the utilization Voltage stabilizing module, still need near near the IC power supply, to have inserted the high frequency interference of the electric capacity inhibition of 100 μ F and 0.1 μ F from ground wire, after making signal pass through wave filter, can not only guarantee the integrality of whole signal, can guarantee that more extremely low noise and temperature float.
Consult Fig. 4, normally for the interference of filtering industrial frequency, this power frequency interference is meant that mainly frequency is the undesired signal of 50Hz to the purpose of design of trapper at the present situation of China in the system.The effective way of this single-frequency signals of filtering is to adopt trapper, adopts switching capacity LTC 1068-200CG to finish the quadravalence trapper of four tunnel parallel (the integrated two-way of a core assembly sheet) in conjunction with associated resistor in the design.Whole design can be finished in conjunction with the filter-design software that Linear Tech provided, and comprises the calculating of corresponding resistor resistance.
According to the parameter that provides in the filter-design software, the purpose that LTC1068-200CG reaches the 50Hz trap need be that the TTL of 10KHz or CMOS level dutycycle are 50% square-wave signal in the input end of clock incoming frequency.The 10KHz square-wave signal that utilizes NE555 to produce in the design will to aspire for stability.Because the signal through trapper part is a simulating signal, its clock signal that adopts then is digital signal, for fear of the phase mutual interference between two kinds of signals, notch filter circuit and signal generator circuit simulate accordingly and digitally must isolate.Thereby guarantee the high fidelity of signal to the full extent, effectively the filtering power frequency is disturbed.
Although a problem must considering in the system is to exist the power frequency of 50Hz to disturb certainly, but the frequency of effective seismic signal comprises the signal of 50Hz in the actual various method of seismic prospecting, if select to have used this trapper in the system, in theory also filtering effective seismic signal of this frequency, so the use of trapper must fully take into account the needs of field acquisition and method of exploration, avoid occurring causing systematic error, and the system that fully guarantees is in the state of relatively optimizing because method selects improper.
Consult Fig. 5, the interference of wiring condition and environment in the engineering seismology exploration generally, make the seismic signal frequency interferences not only come from high frequency interference, the more following many low-frequency disturbance of effective earthquake signal frequency that also come from, equally, the desired filter cutoff frequency of specific method of seismic prospecting and geologic condition and environment also can be completely different, institute thinks and satisfies system requirements, low-cut filter is that the design of Hi-pass filter is that cutoff frequency can dynamically be adjusted equally, system makes full use of the various performances of digital regulation resistance X9241U, finishes the four tunnel parallel passive high pass RC wave filters of second order in conjunction with capacitance network.Taking into full account X9241U potentiometer maximum value is 50K, determines the appearance value size of electric capacity in the design usually, thus can be according to the computing formula f of these parameter utilizations RC High Pass Filter Cutoff Frequency
c=1/2 π RC calculates the potentiometer resistance that corresponding cutoff frequency needs, and then change the corresponding potentiometer resistance of X9241U by master controller and reach the adjustable purpose of whole High Pass Filter Cutoff Frequency, owing to only be the resistance that needs control X9241U built-in potential device, circuit adopts single 5V power supply power supply.
Consult Fig. 6 and Fig. 7, disposal route in conjunction with above-mentioned signal processing module, and take into full account the difference of field geology condition and method of exploration, but the various parameters of signal processing unit must be dynamic-configuration, whether need by three kinds of wave filters as seismic signal, through one or several wave filters wherein, reasonable processing mode is that signal passes through necessary signal selection distribution network, the main flow direction of seismic signal is at first to pass through signal distribution unit, flow into various filter cells respectively and pass straight through to the signal selected cell, and seismic signal wherein divides its next stage wave filter of inflow again and passes straight through to the signal selected cell behind two groups of wave filters before outflow.From the whole as can be seen server of whole block diagram partly is that signal is selected distributor circuit, adopts data selector MAX399 to finish this function among the design.It has two four of characteristics such as high precision, utmost point low delay, track to track input and output, extremely low power dissipation and selects a data selector, the inner CMOS process structure that adopts, also making MAX399 to overturn thus uses as data distributor, it connects the back internal resistance less than 100 Ω, each interchannel semifixed resistor is less than 6 Ω, scheme adopts 5V dual power supply mode, guarantees the high-low level that it can good compatible seismic signal.MAX399 mainly is that the high-low level by two control ports makes up the selection that realizes passage, four signals that select one combination of channels mode also fully to satisfy system are selected requirement, MAX399 only needs two line traffic controls simultaneously, save many IO mouth resources of master controller, also made programming Control more easy simultaneously.
Claims (6)
1. the dynamic configuration signal disposal system of a multichannel, it is characterized in that: this disposal system is by dynamically configuration signal processing module and main control module constitute;
Dynamically the configuration signal processing module is by four tunnel Programmable Gain Amplifier Circuit, signal is selected distributor circuit one, adjustable cutoff frequency low-pass filter, adjustable cutoff frequency Hi-pass filter, trapper, signal selects distributor circuit two to form, original signal is at first amplified through four tunnel Programmable Gain Amplifier Circuit, select distributor circuit one to be assigned as by signal again and flow into adjustable cutoff frequency low-pass filter, adjustable cutoff frequency Hi-pass filter, the signal of trapper and four kinds of flow directions of through connect signal flows to adjustable cutoff frequency low-pass filter, adjustable cutoff frequency Hi-pass filter, three road signals of trapper flow into signal once more with through connect signal after treatment and select distributor circuit two to select to distribute;
Main control module is used for the drive controlling to system's each processing unit programmable analog chip, and accepts from the various steering orders of the outside configuration parameter with real-time adjustment each processing unit.
2. according to the dynamic configuration signal disposal system of the described a kind of multichannel of claim 1, it is characterized in that: described signal selects distributor circuit one, two to select a data selector to realize function by four.
3. according to the dynamic configuration signal disposal system of the described a kind of multichannel of claim 1, it is characterized in that: the function of described trapper is a filtering 50Hz industrial frequency.
4. according to the dynamic configuration signal disposal system of the described a kind of multichannel of claim 1, it is characterized in that: described master controller is any one among single-chip microcomputer, ARM, FPGA, the DSP.
5. according to the dynamic configuration signal disposal system of the described a kind of multichannel of any claim in the claim 2 to 4, it is characterized in that: each processing unit all adopts full simulation programmable chip in the described dynamically configuration signal processing module.
6. according to the dynamic configuration signal disposal system of the described a kind of multichannel of any claim in the claim 2 to 4, it is characterized in that: separate between each treatment channel in the described dynamically configuration signal processing module.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050052951A1 (en) * | 2003-05-30 | 2005-03-10 | Ray Clifford H. | Method and apparatus for seismic data acquisition |
| CN100419457C (en) * | 2005-03-18 | 2008-09-17 | 中国海洋石油总公司 | Ocean seism prospecting data collecting recording system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050052951A1 (en) * | 2003-05-30 | 2005-03-10 | Ray Clifford H. | Method and apparatus for seismic data acquisition |
| CN100419457C (en) * | 2005-03-18 | 2008-09-17 | 中国海洋石油总公司 | Ocean seism prospecting data collecting recording system |
Non-Patent Citations (2)
| Title |
|---|
| 《中国博士学位论文全文数据库基础科学辑（月刊）》 20070915 曹平 勘探地震数据获取系统设计 22，27，36-49，95-104 1-6 , 第3期 2 * |
| 《地球物理学报》 19980930 邵安民等 24道宽频带程控数字记录器硬件的研制 720-723 1-6 第41卷, 第5期 2 * |
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