CN1657740A - Method and device for receiving and detecting mud pressure pulse signal - Google Patents
Method and device for receiving and detecting mud pressure pulse signal Download PDFInfo
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- CN1657740A CN1657740A CN2004100055250A CN200410005525A CN1657740A CN 1657740 A CN1657740 A CN 1657740A CN 2004100055250 A CN2004100055250 A CN 2004100055250A CN 200410005525 A CN200410005525 A CN 200410005525A CN 1657740 A CN1657740 A CN 1657740A
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Abstract
The invention relates to a method and device for receiving and testing pulse signal of mud pressure receiving the signal of coding information containing the mud pressure transmitted from signal channel; filtering the signal received; clearing the direct current component of the signal; building noise evaluation to the noise in the signal; relative operation of simultaneous word detection systematically to the signal without direct current component; self-adopted filtering to the signal without direct current component; using relative operation of code to decide code and demodulate the data from the signal received according to the coding protocol. Even in the seriously noisy environment, the useful signal can also be abstracted out; meanwhile, the method can is compatible several measuring instrument.
Description
Technical field
The present invention relates to be used for the measurement while-drilling instrument of geological resource exploration and production drilling, especially utilize drilling liquid pressure pulse train to transmit the measurement while-drilling instrument of information such as steering tool (MWD), logging while drilling apparatus (LWD) etc.Be a kind of method and device that receives and detect the mud-pressure pulses signal concretely.
Background technology
At present, both at home and abroad for MWD (steering tool), LWD measurement while-drilling instruments such as (logging while drilling apparatuses), mostly be to adopt mud (drilling fluid) pressure pulse as the signal transfer mode, being about to the underground survey data modulates according to the pulse code of certain sequence, in the slurry fluid of hollow drill string inside, produce a series of pressure pulse by the mud-pressure pulses generator, the pressure of setting pressure sensor measurement mud changes on the standpipe on ground, by certain algorithm the underground survey data demodulates is come out.But no matter positive pulse or negative pulse, along with the increase of measuring well depth, because the mud-pressure pulses signal is constantly decay in transmittance process, add the interference of factors such as noise and echo, make reception on the ground and detection signal become difficult, especially under the noise circumstance condition of severe, existing method just can't detect useful signal at all, limited the use of this type of measurement while-drilling instrument, dissimilar in addition instruments, its ground system incompatible, it is very inconvenient to make site engineers' operation and maintenance get up.
Summary of the invention
The objective of the invention is to, a kind of method and device that receives and detect the mud-pressure pulses signal is provided, receive and detection method in order to set up a kind of more efficient signal, even under the noise circumstance condition of severe, also can be with useful signal from being extracted the information of noise severe contamination of receiving; Realize described method by described device simultaneously, and compatible several DHM-MWD instruments.
Technical scheme of the present invention is:
A kind of method that receives and detect the mud-pressure pulses signal, it receives the signal that contains the mud-pressure pulses coded message that transmits from channel;
Carry out LPF to the received signal;
Signal behind the LPF is carried out the removal of DC component;
Noise is to the received signal set up Noise Estimation;
Carry out system synchronization word detection related operation to having removed signal without direct current component;
Carry out adaptive-filtering to having removed signal without direct current component;
Adopt sign indicating number position related operation to judge the sign indicating number position, and from the signal that receives, demodulate data according to coding protocol.
The described LPF that carries out to the received signal comprises: described LPF is realized by hardware; Or described LPF is realized by software.
The described removal that signal behind the LPF is carried out DC component comprises: directly that signal value is average and obtain DC component, wherein: to such an extent as to average length can not longly can not reflect DC component over time, to such an extent as to and average length can not too short normal signal amplitude modulation loss be fallen; Remove the signal waveform of DC component front and back.
Described noise in is to the received signal set up Noise Estimation and is comprised: pump is driven into row judge, a back time period of pressure stability (as 60 seconds) proceed-to-send signal afterwards left by pump, utilize the signal vacuum phase in the described time period, set up Noise Estimation.
Describedly carry out the system synchronization word and detect related operation and comprise: carry out inner product operation having removed signal without direct current component and signal templates (as the system synchronization word) to having removed signal without direct current component; If the operation result value is big, then similarity degree is big, and the position in its corresponding relevant range is the position of system synchronization word.
Described Noise Estimation is in order to determine the associated gate limit value.
Describedly carry out adaptive-filtering and comprise having removed signal without direct current component: adopt the NLMS algorithm to carry out signal and handle, it satisfies following formula:
y(n)＝w(n)′×x(n)
e(n)＝y(n)-d(n)
Three formula interative computations are finally restrained until w, and wherein, x (n) is the described signal without direct current component of having removed, and d (n) is the training sequence that is provided with in advance.
The described sign indicating number position related operation that adopts judges that the sign indicating number position comprises: detect the related operation of modulating pulse, that is: ask the average of all sampled points in the modulation window successively, this average is correlated results, and by asking local extremum to obtain pulse position.
The described sign indicating number position related operation that adopts judges that the sign indicating number position comprises: the amplitude average of the impulse amplitude of signal by the synchronous head correspondence position obtains estimation in advance, to determine dependent threshold.
When detecting correlation peak, do not set fixed threshold, but check, to overcome the fluctuation of DC level in signal duration according to the high-low level difference of priori;
Be multiplied by a coefficient according to its prospective peak value and obtain the associated gate limit value, will obtain the position of correlation peak in surpassing the correlation scope of this thresholding, this moment, associated window overlapped with coded pulse; And thresholding can be brought in constant renewal in the continuous variation with the adaptation signal environment in signal processing.
Behind the position of a coded pulse, for sign indicating number position coding, the starting point that next coded pulse detects can be carried out after a coded pulse on being right after, and promptly resets the time starting point on detecting;
For combinational code position coding, carry out according to coding unit (being pulse combined).
In demodulating process, signal substrate value and correlation are made comparisons, to find the saltus step of correlation;
Constantly average signal amplitude is as the signal substrate, then will need the signal of surveyed area to carry out related operation, the result and the substrate value of related operation are made comparisons, if difference has exceeded default threshold value, then think and detected coded pulse, and further search the local maximum of hop value, at this position associated window and pulse matching;
If hop value surpasses thresholding, and the slip of associated window is from front to back, then do not comprise coded pulse as yet at the section start of this window at least, upgrades the substrate value thereby utilize these to sample;
If the amplitude saltus step is greater than default comparison threshold then enter the local maximum of circulation with the search saltus step, the position of writing down this local maximum is used for back sign indicating number position demodulation.
Limited the width of correlated results above thresholding; If described correlated results is lower than certain thresholding width, think that promptly burst noise disturbs and skips;
Under ideal does not have the situation of making an uproar, should be 2 (1-k) T greater than the width of presetting thresholding kT, wherein T is a coded pulse width.
The present invention also provides a kind of device that receives and detect the mud-pressure pulses signal, comprising: standpipe pressure sensor, Signal Pretreatment unit, DSP signal processing unit, computer;
Described standpipe pressure sensor is connected with described Signal Pretreatment unit; Described Signal Pretreatment unit is connected with described DSP signal processing unit; Described DSP signal processing unit is connected with described computer;
Standpipe pressure sensor: measure the mud pressure at standpipe place, the variation of standpipe pressure is converted to the signal of telecommunication;
Signal Pretreatment unit: receive signal, and have the LPF function, with the high-frequency interferencing signal filtering from the standpipe pressure sensor;
DSP signal processing unit: be provided with AD module, memory;
Computer: storage signal, receive with detect data, and the DSP signal processing unit communicate; And: the signal behind the LPF is carried out the removal of DC component; Noise is to the received signal set up Noise Estimation; Carry out system synchronization word detection related operation to having removed signal without direct current component; Carry out adaptive-filtering to having removed signal without direct current component; Adopt sign indicating number position related operation to judge the sign indicating number position, and from the signal that receives, demodulate data according to coding protocol.
Described Signal Pretreatment unit is a Signal Pretreatment case, and described DSP signal processing unit is a DSP signal processing card; Wherein:
The standpipe pressure sensor is connected to by lead-in wire on the holding wire terminal of preliminary treatment case, and the signal output terminal of preliminary treatment case is connected to by lead-in wire on the signal input terminal of the DSP signal processing card in the expansion slot that is inserted in motherboard in the computer;
Standpipe pressure sensor: measure the mud pressure at standpipe place, the variation of standpipe pressure is converted to the signal of telecommunication;
The Signal Pretreatment case: contain power supply, division board, Signal Pretreatment card, power supply is powered to the standpipe pressure sensor, and receives the signal from the standpipe pressure sensor, and the division board in it is isolated extraneous dangerous voltage and Signal Pretreatment card and computer; The Signal Pretreatment jig has the LPF function, with the high-frequency interferencing signal filtering;
The DSP signal processing card is provided with AD module, memory;
Computer: storage signal, receive and detection software and data, and communicate by letter with the DSP signal processing card.Beneficial effect of the present invention is: by a kind of apparatus and method that receive and detect the MWD/LWD signal are provided, improved the detection recognition capability to the MWD/LWD signal, the maximum that has increased MWD/LWD is measured well depth; And its compatible several DHM-MWD instruments have strengthened the ease for use and the ease for maintenance of ground signal checkout gear.
Description of drawings
Fig. 1 is that signal waveform changes comparison diagram before and after the DC component;
Fig. 1 a is a DC component front signal oscillogram;
Fig. 1 b is a signal waveforms after the DC component;
Fig. 2 is that the information source level changes schematic diagram before and after the turn on pump;
Fig. 3 is wave form varies figure before and after the modulation waveform relevant treatment of ideal code position;
Fig. 4 is a filtered actual code position demodulation schematic diagram;
Fig. 5 is apparatus of the present invention schematic diagrames.
The specific embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention:
1. set up a kind of more efficient signal detection method, at general mud-pulse coded modulation principle, be synchronization character raise the price the position or combinational code position modulation principle, the present invention provides a kind of more effective mud-pressure pulses signal detecting method, the core of this method is to carry out LPF to the received signal one time, and go DC component treatment, and then carry out twice related operation (once to synchronization character, once to the sign indicating number position) and adaptive-filtering and finish detection signal.In actual applications, the signal that has coded message is by channel degradation, the input signal that can think information source and channel transfer functions convolution mutually cause intersymbol interference, adopting adaptive-filtering promptly is that original coding is recovered to come out from these disturbed signals to the information source equilibrium treatment, so the essence of its processing is deconvolution (De-Convolution) computing.But the feature of channel in time and spatial variations, is difficult to fix its filter parameter, so utilize the synchronous head in the practical communication agreement to train sef-adapting filter.In training process, because content that information source sent is known, sef-adapting filter is constantly regulated parameter and is made error minimum between output and known correct content.But the adaptive-filtering training process carry out the accurate location that must depend on synchronous head, relevant treatment provides this processing required simple and powerful algorithm.Particular content is as follows:
1) LPF
Because useful signal is a low frequency signal, so any HFS in the signal all is all to be to disturb.LPF can be realized by hardware, also can realize by software, realize to reduce the burden that follow-up signal is handled by hardware, realize then having greater flexibility, such as choosing window function and parameter designing flexibly or changing wave filter etc. by software.In order to obtain good filtering effect, this method has adopted the Kaiser window function.
2) extraction of DC component and removal
Because the deterioration of actual signal channel, the DC level of signal has fluctuation by a relatively large margin, and this detection for useful signal is a kind of very big interference.DC component can directly on average obtain signal value, seeks only average length and requires careful consideration.To such an extent as at first average length can not longly can not reflect DC quantity over time, to such an extent as to secondly average length can not too shortly be fallen normal signal amplitude modulation loss.Average length is got 10 time slot length approximately generally speaking, promptly roughly is equivalent to the system synchronization word length.The signal waveform of removing the DC component front and back changes sees accompanying drawing 1.
3) set up Noise Estimation
Estimate that the noise in the mud-pressure pulses signal is the thing of a trouble, how meticulous that no matter analyzes in theory is, also is difficult to reflect the noise in the true environment comprehensively.The present invention is according to the working rules of downhole pulser, be that back, back pressure stability a period of time (as 60 seconds) proceed-to-send signal left by pump, by utilizing this segment signal vacuum phase, set up Noise Estimation, because the sample value of noise is taken from truth, the Noise Estimation of being set up is more near actual conditions.
Owing to very short a period of time after Noise Estimation builds on pump and opens, therefore judge that it is a key issue that pump leaves.Usually after pump left, standpipe pressure raise gradually, until stable, as shown in Figure 2.Can be used as the sign that pump leaves so judge the variation of information source level.Rule of thumb, can be easy to provide a pressure threshold as the pump will of opening bid, but before and after also can opening by pump this feature of significant difference of level as the method for judging that pump leaves.During concrete enforcement, can select as required.
Associated gate limit value when utilizing related operation detection system synchronization character below Noise Estimation result is used for determining.
4) the system synchronization word detects
The present invention adopts related operation to come the detection system synchronization character.Be about to step 2) in resulting signal and signal templates (as the system synchronization word) carry out inner product operation, the operation result value thinks that greatly promptly similarity degree is big, the position in its corresponding relevant range is the position of system synchronization word.
Because the system synchronization word occurs at random, have no idea to pre-determine a relevant range and seek its maximum value and locate synchronization character, do not occur at this regional synchronization character if determine a relevant range artificially, search the generation that largest correlation result will cause false-alarm simply.When handling in real time, in the judging process after relevant, at first to utilize 3) in method determine Noise Estimation, to determine the associated gate limit value.For example, for the relevant back noise that is Gaussian distribution, can get 3 times of its mean square deviations and obtain being better than 1% false-alarm probability as the associated gate limit value.
In order further to reduce false-alarm probability, can carry out in conjunction with the demodulating process of back in the practical application.If demodulation result does not meet rule, then synchronous head detects and mistake occurs, needs to detect again.
5) adaptive-filtering
In order to solve the data of having modulated more reliably, need more effectively recover original signal waveform.The adaptive-filtering that the present invention adopts is highly effective for recovering original signal waveform under the situation that system is lacked enough parameters.In concrete enforcement, the present invention has adopted the NLMS algorithm, because the NLMS algorithm is the improvement of LMS algorithm.And the robustness of LMS algorithm is better, and the computing that relates to is simple, and main computing is vector and handles, and does not have complicated matrix multiplication and inverts.Main calculation procedure is as follows:
y(n)＝w(n)′×x(n)
e(n)＝y(n)-d(n)
Three formula interative computations are finally restrained until w, and wherein, x (n) is a step 2) in resulting signal, d (n) is the training sequence that is provided with in advance, such as synchronous head.
6) signal decoding
With 5) in the useful signal that extracts decode according to coding rule.Because the modulation system of data is the modulation of sign indicating number position, the correct demodulation of data depends on the accurate judgement of modulating pulse position.Can reach good performance for this situation related operation, but this moment the related operation that carries out with the related operation of detection system synchronization character have 2 different: 1 related operation that detects modulating pulse can think to ask successively the average of interior all sampled points of modulation window in fact, and this average is correlated results can obtain pulse position by asking local extremum.The impulse amplitude of 2 signals can obtain estimation in advance by the amplitude average of synchronous head correspondence position, can determine dependent threshold more exactly like this.In order further to improve the reliability that detects, in program, detect correlation peak and do not set fixed threshold, but check to overcome the fluctuation of DC level in signal duration according to the high-low level difference of priori.As shown in Figure 3, the one sign indicating number position modulation waveform that has square-wave pulse obtains triangular wave after relevant, can be multiplied by a coefficient according to its prospective peak value and obtain the associated gate limit value, the position that will obtain correlation peak in surpassing the correlation scope of this thresholding thinks that promptly this moment, associated window overlapped with coded pulse.And thresholding T can bring in constant renewal in the continuous variation with the adaptation signal environment in signal processing.
Behind the position of a coded pulse, for sign indicating number position coding, the starting point that next coded pulse detects can be carried out after a coded pulse on being right after, and promptly resets the time starting point on detecting; For combinational code position coding, also to carry out according to coding unit (being pulse combined).Overcome like this because the sample rate or the very inaccurate accumulation of error that causes of information source timing finally make a sign indicating number position demodulation mistake.
In demodulating process, signal substrate value and correlation are made comparisons, to find the saltus step of correlation.In order to guarantee the accuracy of substrate amplitude, constantly average signal amplitude is as the signal substrate.Then will need the signal of surveyed area to carry out related operation, the result and the substrate value of related operation are made comparisons, if difference has exceeded default threshold value, then think and detected coded pulse, and further search the local maximum of hop value, promptly think associated window and pulse matching in this position.If hop value surpasses thresholding, simultaneously because the slip of associated window is from front to back, so can think that at least the section start at this window does not comprise coded pulse as yet, upgrades the substrate value thereby can utilize these to sample.If the amplitude saltus step is greater than default comparison threshold then enter the local maximum of circulation with the search saltus step, the position of writing down this local maximum is used for back sign indicating number position demodulation.
In order further to improve reliability, also limited the width of correlated results in the program above thresholding.If this width is lower than certain thresholding width, think that promptly burst noise disturbs and skips.As shown in Figure 3, under ideal does not have the situation of making an uproar, should be 2 (1-k) T greater than the width of presetting thresholding kT, wherein T is a coded pulse width.In concrete enforcement, the present invention has got conservative value (1-k) T to width threshold.Can utilize the twice actual maximum hop value average result measured preset parameter T in accompanying drawing 3 thereafter.Accompanying drawing 4 has been illustrated the location situation of each coded pulse, and wherein spike is the coded pulse position.
Determined above-mentioned sign indicating number position or combinational code position, just can be easy to demodulate data in conjunction with coding protocol.
2. design relevant apparatus and software kit
The coherent signal reception of the present invention's design and checkout gear comprise standpipe pressure sensor, Signal Pretreatment case, DSP signal processing card, computer as shown in Figure 5.
The standpipe pressure sensor is connected on the holding wire terminal of preliminary treatment case by lead-in wire, and signal output terminal is connected on the signal input terminal of the dsp board in the expansion slot that is inserted in motherboard in the computer by lead-in wire after the processing of preliminary treatment case.
The standpipe pressure sensor is used to measure the mud pressure at standpipe place, the variation of standpipe pressure is converted to the variation of the signal of telecommunication.The preliminary treatment case is not only powered to the standpipe pressure sensor, and receives the signal from the standpipe pressure sensor, and the division board in it is effectively isolated extraneous dangerous voltage and preliminary treatment card and computer, has protected these equipment effectively.The preliminary treatment jig has the LPF function, with the effective filtering of high-frequency interferencing signal.There is the AD module to be used for image data on the dsp board, has the memory can storage signal handling procedure and data on the dsp board.Computer is used for storage signal and receives and detection software and data, and communicates by letter with DSP on the responsible hardware.
With the supporting software of signal supervisory instrument, realized above-mentioned signal detecting method, it is used to drive dsp board acquired signal data, carrying out signal handles and signal decoding, specifically comprise LPF (the LPF function of alternative or additional preliminary treatment card), remove DC component treatment, Noise Estimation, correlation-detection system synchronization character, adaptive-filtering and coherent detection sign indicating number position, operations such as signal decoding.The ground system compatibling problem of different DHM-MWD instruments has also been considered in the design of software in addition, and this mainly is to realize by the communication protocol of considering different instruments.
The present invention has provided a kind of apparatus and method that receive and detect the MWD/LWD signal, and its benefit has two: one, has improved the detection recognition capability to the MWD/LWD signal, and the maximum that has increased MWD/LWD is measured well depth; The 2nd, compatible several DHM-MWD instruments have strengthened the ease for use and the ease for maintenance of ground signal checkout gear.
The above specific embodiment only is used to the present invention is described but not is used to limit the present invention.
Claims (17)
1. a method that receives and detect the mud-pressure pulses signal is characterized in that, receives the signal that contains the mud-pressure pulses coded message that transmits from channel;
Carry out LPF to the received signal;
Signal behind the LPF is carried out the removal of DC component;
Noise is to the received signal set up Noise Estimation;
Carry out system synchronization word detection related operation to having removed signal without direct current component;
Carry out adaptive-filtering to having removed signal without direct current component;
Adopt sign indicating number position related operation to judge the sign indicating number position, and from the signal that receives, demodulate data according to coding protocol.
2. method according to claim 1 is characterized in that, the described LPF that carries out to the received signal comprises: described LPF is realized by hardware; Or described LPF is realized by software.
3. method according to claim 1, it is characterized in that, the described removal that signal behind the LPF is carried out DC component comprises: directly that signal value is average and obtain DC component, wherein: to such an extent as to average length can not longly can not reflect DC component over time, to such an extent as to and average length can not too short normal signal amplitude modulation loss be fallen; Remove the signal waveform of DC component front and back.
4. method according to claim 1, it is characterized in that, described noise in is to the received signal set up Noise Estimation and is comprised: pump is driven into row judge, back pressure stability proceed-to-send signal after time period left by pump, utilize the signal vacuum phase in the described time period, set up Noise Estimation.
5. method according to claim 1 is characterized in that, describedly carries out the system synchronization word and detects related operation and comprise having removed signal without direct current component: carry out inner product operation to having removed signal without direct current component and signal templates; If the operation result value is big, then similarity degree is big, and the position in its corresponding relevant range is the position of system synchronization word.
6. according to claim 4 or 5 described methods, it is characterized in that described Noise Estimation is in order to determine the associated gate limit value.
7. method according to claim 1 is characterized in that, describedly carries out adaptive-filtering and comprises having removed signal without direct current component: adopt the NLMS algorithm to carry out signal and handle, it satisfies following formula:
y(n)＝w(n)′×x(n)
e(n)＝y(n)-d(n)
Three formula interative computations are finally restrained until w, and wherein, x (n) is the described signal without direct current component of having removed, and d (n) is the training sequence that is provided with in advance.
8. method according to claim 1, it is characterized in that, the described sign indicating number position related operation that adopts judges that the sign indicating number position comprises: the related operation that detects modulating pulse, that is: ask the average of all sampled points in the modulation window successively, this average is correlated results, and by asking local extremum to obtain pulse position.
9. method according to claim 1 is characterized in that, the described sign indicating number position related operation that adopts judges that the sign indicating number position comprises: the amplitude average of the impulse amplitude of signal by the synchronous head correspondence position obtains estimation in advance, to determine dependent threshold.
10. method according to claim 9 is characterized in that, does not set fixed threshold when detecting correlation peak, but checks according to the high-low level difference of priori, to overcome the fluctuation of DC level in signal duration;
Be multiplied by a coefficient according to its prospective peak value and obtain the associated gate limit value, will obtain the position of correlation peak in surpassing the correlation scope of this thresholding, this moment, associated window overlapped with coded pulse; And thresholding can be brought in constant renewal in the continuous variation with the adaptation signal environment in signal processing.
11. method according to claim 10 is characterized in that, behind the position of a coded pulse, for sign indicating number position coding, the starting point that next coded pulse detects can be carried out after a coded pulse on being right after, and promptly resets the time starting point on detecting;
For combinational code position coding, carry out according to coding unit.
12. method according to claim 10 is characterized in that, in demodulating process, signal substrate value and correlation is made comparisons, to find the saltus step of correlation.
13. method according to claim 12, it is characterized in that, constantly average signal amplitude is as the signal substrate, then will need the signal of surveyed area to carry out related operation, the result and the substrate value of related operation are made comparisons,, then think to have detected coded pulse if difference has exceeded default threshold value, and further search the local maximum of hop value, at this position associated window and pulse matching;
If hop value surpasses thresholding, and the slip of associated window is from front to back, then do not comprise coded pulse as yet at the section start of this window at least, upgrades the substrate value thereby utilize these to sample;
If the amplitude saltus step is greater than default comparison threshold then enter the local maximum of circulation with the search saltus step, the position of writing down this local maximum is used for back sign indicating number position demodulation.
14. method according to claim 13 is characterized in that, has limited the width of correlated results above thresholding; If described correlated results is lower than certain thresholding width, think that promptly burst noise disturbs and skips.
15. method according to claim 14 is characterized in that, under ideal does not have the situation of making an uproar, should be 2 (1-k) T greater than the width of presetting thresholding kT, wherein T is a coded pulse width.
16. a device that receives and detect the mud-pressure pulses signal, comprising: standpipe pressure sensor, Signal Pretreatment unit, DSP signal processing unit, computer;
Described standpipe pressure sensor is connected with described Signal Pretreatment unit; Described Signal Pretreatment unit is connected with described DSP signal processing unit; Described DSP signal processing unit is connected with described computer;
Standpipe pressure sensor: measure the mud pressure at standpipe place, the variation of standpipe pressure is converted to the signal of telecommunication;
Signal Pretreatment unit: receive signal, and have the LPF function, with the high-frequency interferencing signal filtering from the standpipe pressure sensor;
DSP signal processing unit: be provided with AD module, memory;
Computer: storage signal, receive with detect data, and the DSP signal processing unit communicate; And: the signal behind the LPF is carried out the removal of DC component; Noise is to the received signal set up Noise Estimation; Carry out system synchronization word detection related operation to having removed signal without direct current component; Carry out adaptive-filtering to having removed signal without direct current component; Adopt sign indicating number position related operation to judge the sign indicating number position, and from the signal that receives, demodulate data according to coding protocol.
17. device according to claim 16, described Signal Pretreatment unit are a Signal Pretreatment case, described DSP signal processing unit is a DSP signal processing card; Wherein:
The standpipe pressure sensor is connected to by lead-in wire on the holding wire terminal of preliminary treatment case, and the signal output terminal of preliminary treatment case is connected to by lead-in wire on the signal input terminal of the DSP signal processing card in the expansion slot that is inserted in motherboard in the computer;
Standpipe pressure sensor: measure the mud pressure at standpipe place, the variation of standpipe pressure is converted to the signal of telecommunication;
The Signal Pretreatment case: contain power supply, division board, Signal Pretreatment card, power supply is powered to the standpipe pressure sensor, and receives the signal from the standpipe pressure sensor, and the division board in it is isolated extraneous dangerous voltage and Signal Pretreatment card and computer; The Signal Pretreatment jig has the LPF function, with the high-frequency interferencing signal filtering;
The DSP signal processing card is provided with AD module, memory;
Computer: storage signal, receive and detection software and data, and communicate by letter with the DSP signal processing card.
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| CN102200009A (en) * | 2010-12-20 | 2011-09-28 | 中国石油集团钻井工程技术研究院 | Method for processing MWD (Measurement While Drilling) underground continuous wave signal |
| CN102644458A (en) * | 2012-04-17 | 2012-08-22 | 中国海洋石油总公司 | Instruction downlink encoding and decoding methods based on mud-pressure pulses |
| CN102707702A (en) * | 2012-06-29 | 2012-10-03 | 中国石油集团西部钻探工程有限公司 | Underground pressure wave control device |
| CN103573258A (en) * | 2013-10-10 | 2014-02-12 | 航天科工惯性技术有限公司 | Method for decoding downlink instruction by rotary steering drilling system |
| CN104343440A (en) * | 2014-08-29 | 2015-02-11 | 北京市普利门电子科技有限公司 | Method and system for detecting mud pressure pulse signal |
| CN109580087A (en) * | 2018-12-12 | 2019-04-05 | 中国海洋石油集团有限公司 | A kind of test macro and method of standpipe pressure sensor |
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|---|---|---|---|---|
| US3863203A (en) * | 1972-07-18 | 1975-01-28 | Mobil Oil Corp | Method and apparatus for controlling the data rate of a downhole acoustic transmitter in a logging-while-drilling system |
| US5272680A (en) * | 1990-01-09 | 1993-12-21 | Baker Hughes Incorporated | Method of decoding MWD signals using annular pressure signals |
| CN2089523U (en) * | 1991-03-18 | 1991-11-27 | 石油大学(华东) | Mud filtering and removing device for signal channel interference |
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