CN109617651A - Underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technology based on BPSK - Google Patents
Underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technology based on BPSK Download PDFInfo
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- CN109617651A CN109617651A CN201811457169.4A CN201811457169A CN109617651A CN 109617651 A CN109617651 A CN 109617651A CN 201811457169 A CN201811457169 A CN 201811457169A CN 109617651 A CN109617651 A CN 109617651A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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Abstract
The present invention provides the underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technologies based on BPSK, comprising: acquires all kinds of drill bit attitude datas to be measured by sensor；Bose-Chaudhuri-Hocquenghem Code processing is carried out to the collected data of sensor, by the n-k grade shift register with feedback loop, with message polynomial divided by generator polynomial, the check part as code word is taken the remainder, completes Bose-Chaudhuri-Hocquenghem Code；BPSK modulation is carried out to the signal obtained after coding, is emitted subsequently into after transmitting module power amplification；Ground instrument receives the signal of transmitting module transmitting, demodulate after signal condition by shaping circuit；BCH decoding is carried out to the signal after demodulation, the data that decoding obtains are sent to host computer.The present invention is able to solve serious by noise jamming when current electromagnetic signal uploads to well head receiver from silo-bottom launch machine, can not restore disturbed signal accurately to obtain this technical problem of downhole data.
Description
Technical field
The present invention relates to the underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technologies based on BPSK.
Background technique
In the drilling process of Special Drilling Operation, how rapidly, efficiently and accurately control well track is so as to timely correction,
It is the key that guarantee drilling quality.And in measurement while drilling practical application, the data of sensor at drill bit in real time, are reliably passed
It is sent to earth's surface, downtime can be reduced to the maximum extent, improves working efficiency.Electromagnetic measurement while drilling (EM-MWD,
Electromagnetic Measurement While Drilling) carrier of the mud as signal is not needed, to drilling fluid
Lower with drilling pump requirement, data transmission capabilities are stronger, have better adaptability for underbalance well.
Decay when electromagnetic signal is transmitted to adjacent ground surface from shaft bottom serious, is influenced by wellbore construction scene, work near well head
The addition interferences sources such as frequency interference signal, natural potential signal are mixed into electromagnetism and receive signal, enter data through well head receiving electrode and connect
Instrument is received, easily generation error code, influences data accuracy.It, can be in electromagnetic measurement while drilling for improve data transfer reliability
Channel error correction coding techniques is introduced in system, and signal bit signal-to-noise ratio is made still to can achieve reliable communication condition when reducing.With brill
Measurement channel coding document focuses primarily upon foreign well-known geophysical service company patent.Baker Hughes company, which is directed in well, to scheme
As data, using cyclic redundancy check code CRC-16 as internal code, convolutional code is as foreign key, by internal code and foreign key grade
Connection had both had error detection function but also with error correcting capability, and had solved the problems, such as poor transmission with more protection information.Shell is public
Department proposes to use Turbo code or low density parity check code (LDPC, Low density parity in shaft communication
check).Consider for technical know-how, external commercial product and domestic model machine are rarely reported electromagnetic measurement while drilling channel volume
Code method, some key technologies can not be grasped.
Summary of the invention
The technical problem to be solved in the present invention is that uploading to well head from silo-bottom launch machine for above-mentioned current electromagnetic signal
It is serious by noise jamming when receiver, it the technical issues of disturbed signal can not being restored accurately to obtain downhole data, provides
Underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technology based on BPSK solves above-mentioned technological deficiency.
Underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technology based on BPSK, comprising:
Step 1: acquiring all kinds of drill bit attitude datas to be measured by sensor；
Step 2: carrying out Bose-Chaudhuri-Hocquenghem Code processing to the collected data of sensor, shifted by the n-k grade with feedback loop
Register obtains code word divided by generator polynomial g (x) with message polynomial u (x), and takes the remainder the check part as code word,
Complete Bose-Chaudhuri-Hocquenghem Code；
Step 3: BPSK modulation is carried out to the signal obtained after Bose-Chaudhuri-Hocquenghem Code, after transmitting module power amplification
Transmitting；
Step 4: ground instrument receives the signal of transmitting module transmitting, solve after signal condition by shaping circuit
It adjusts；
Step 5: carrying out BCH decoding to the signal after demodulation, the data that decoding obtains are sent to host computer.
Further, the Bose-Chaudhuri-Hocquenghem Code in step 2, specifically includes:
21, the data x acquired according to sensorn-kU (x) realizes Bose-Chaudhuri-Hocquenghem Code by shift register；
22, preceding k period, information are exported while input circuit；Start in+1 cycle clock of kth, shifts
Data, that is, check bit Serial output in register completes first encoding；
23, each clock cycle will have a data to move into register and post when total data all sequentially enters register
Content in storage is the check code of Bose-Chaudhuri-Hocquenghem Code；
Wherein, n is code length, and k is information bit, and message polynomial is u (x), and generator polynomial is g (x), check bit multinomial
For r (x), systematic code is C (x)=u (x) xn-k+r(x)。
Further, the BPSK modulation in step 3, specifically includes:
31, the BCH signal after coding is subjected to code conversion；
32, signal and carrier signal are then inputted into multiplier simultaneously, obtain BPSK modulation waveform.
Further, the BPSK demodulation method in step 4, specifically includes:
41, ground instrument is obtained by asymmetric dipole antenna and is believed by the transmitting that stratum transmitting module transmits
Number；
42, to first pass through preposition protection circuit prevent electric current is excessive from burning circuit, later by shaping circuit to receiving
Bpsk signal is filtered enhanced processing, decays to noise；
43, the bpsk signal after filter amplifying processing is by passing through multiplier and carrier wave after band-pass filter
The sync carrier of microsyn output is multiplied；If the signal received and the same phase of carrier signal, being multiplied is positive value；If received
Signal is with reference signal on the contrary, being negative value after being then multiplied；
44, the signal after being multiplied filters High-frequency Interference again by low-pass filter, same by sampling decision device and position
Device is walked to adjudicate the numerical value of baseband signal, if positive value, can adjudicate is 1, and if negative value, then judgement is 0.
Further, the BCH interpretation method in step 5, specifically includes:
51, syndrome s is calculated to the signal after demodulation1~s2t；
52, error location polynomial σ is asked according to syndrome1~σ2t；
53, the root of error location polynomial is calculated using money search method, and then determines the position that mistake occurs；
54, the value Yi on errors present is calculated, in conjunction with the position that mistake occurs, completes error correction.
Further, the transmitting module in step 3 carries out signal amplification, H bridge using the H bridge that 4 power MOS pipes are constituted
It is controlled by two half-bridge driven chips, transmitting signal is then carried out by asymmetric dipole antenna, to realize and ground instrument
The communication of device.
Further, the shaping circuit in step 4, by preposition amplification, filter circuit, programming amplifying, ADC, MCU and
DAC composition；Receiver by asymmetric dipole electrode receive terrestrial transmission come out electric signal, by filtering, enhanced processing,
The suitable signal of purer amplitude is obtained, is sampled by ADC and gives STM32 and analyzed；DAC is used for natural potential
It is adjusted with offset voltage.
The invention has the advantages that:
1, data are encoded using the BCH code of relevant parameter, phase is carried out to coded data in combination with BPSK mode
Position modulation effectively solves the problems, such as that receiver data randomness malfunctions, system reliability is improved, when keeping signal bit noise relatively low
It still can achieve reliable communication condition, stablize and receive data；
2, shown compared with the BPSK without Bose-Chaudhuri-Hocquenghem Code by field field test, in the extreme case of low signal-to-noise ratio
Under, decoded bit error rate can be reduced about 10 times by the Bose-Chaudhuri-Hocquenghem Code modulation technique based on BPSK proposed, make signal bit noise
It still can achieve reliable communication condition when relatively low, stablize and receive data.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technical architecture plan of the invention based on BPSK；
Fig. 2 is serial Bose-Chaudhuri-Hocquenghem Code structure chart of the invention；
Fig. 3 is BPSK modulated structure figure of the invention；
Fig. 4 is BPSK coherent demodulation structure chart of the invention；
Fig. 5 is the decoding block diagram of BCH code of the invention.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
Underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technology based on BPSK, as shown in Figure 1, comprising:
Step 1: acquiring all kinds of drill bit attitude datas to be measured by sensor；
Step 2: carrying out Bose-Chaudhuri-Hocquenghem Code processing to the collected data of sensor, shifted by the n-k grade with feedback loop
Register obtains code word divided by generator polynomial g (x) with message polynomial u (x), and takes the remainder the check part as code word,
Complete Bose-Chaudhuri-Hocquenghem Code；
Step 3: BPSK modulation is carried out to the signal obtained after Bose-Chaudhuri-Hocquenghem Code, after transmitting module power amplification
Transmitting；
Step 4: ground instrument receives the signal of transmitting module transmitting, solve after signal condition by shaping circuit
It adjusts；
Step 5: carrying out BCH decoding to the signal after demodulation, the data that decoding obtains are sent to host computer.
Bose-Chaudhuri-Hocquenghem Code in step 2, as shown in Figure 2, the specific steps are as follows:
21, the data x acquired according to sensorn-kU (x) realizes Bose-Chaudhuri-Hocquenghem Code by shift register；
22, preceding k period, information are exported while input circuit；Start in+1 cycle clock of kth, shifts
Data, that is, check bit Serial output in register completes first encoding；
23, each clock cycle will have a data to move into register and post when total data all sequentially enters register
Content in storage is the check code of Bose-Chaudhuri-Hocquenghem Code；
Wherein, n is code length, and k is information bit, and information bit multinomial is u (x), and generator polynomial is g (x), and check bit is multinomial
Formula is r (x), and systematic code is C (x)=u (x) xn-k+r(x)。
BPSK modulator approach in step 3, as shown in Figure 3, the specific steps are as follows:
After Bose-Chaudhuri-Hocquenghem Code is completed, start to carry out BPSK modulation:
31, the BCH signal after coding is subjected to code conversion；
32, signal and carrier signal are then inputted into multiplier simultaneously, obtain BPSK modulation waveform.
BPSK demodulation method in step 4, as shown in Figure 4, the specific steps are as follows:
41, ground instrument is obtained by asymmetric dipole antenna and is believed by the transmitting that stratum transmitting module transmits
Number；
42, to first pass through preposition protection circuit prevent electric current is excessive from burning circuit, later by shaping circuit to receiving
Bpsk signal is filtered enhanced processing, decays to noise；
43, the modulation system of BPSK is because in transmitter terminal using some phase as initial phase, in receiver end
Also reference must be used as with this initial phase fixed of transmitter terminal.If fixed phase is changed, receiver is extensive
Multiple information will malfunction, so needing to use Carrier Synchronization in receiving end.Therefore, the bpsk signal after handling passes through
After band-pass filter, it is multiplied by multiplier with the sync carrier that carrier synchronization device exports.If the signal received with
The same phase of carrier signal, then being multiplied is positive value；If the signal received with reference signal on the contrary, if be multiplied after for negative value；
44, the signal after being multiplied filters High-frequency Interference again by low-pass filter, same by sampling decision device and position
Device is walked to adjudicate the numerical value of baseband signal, if positive value, can adjudicate is 1, and if negative value, then judgement is 0, after being demodulated
Signal.
BCH interpretation method in step 5, as shown in Figure 5, the specific steps are as follows:
51, syndrome s is calculated to the signal R (x) after demodulation1~s2t；
52, error location polynomial σ is asked according to syndrome1~σ2t；
53, the root of error location polynomial is calculated using money search method, and then determines the position that mistake occurs；
54, the value Yi on errors present is calculated, in conjunction with the position that mistake occurs, completes error correction.
Transmitting module in step 3 carries out signal amplification using the H bridge that 4 power MOS pipes are constituted, and H bridge passes through two
Half-bridge driven chip control, then carries out transmitting signal by asymmetric dipole antenna, to realize the communication with ground instrument.
Shaping circuit in step 4, by preposition amplification, filter circuit, programming amplifying, ADC, MCU and DAC composition.It connects
Receipts machine receives the electric signal that terrestrial transmission comes out by asymmetric dipole electrode, by filtering, enhanced processing, obtains purer
The suitable signal of amplitude, sampled by ADC and give STM32 and analyzed.DAC is used for natural potential and offset voltage
It is adjusted.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (7)
1. the underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technology based on BPSK characterized by comprising
Step 1: acquiring all kinds of drill bit attitude datas to be measured by sensor；
Step 2: carrying out Bose-Chaudhuri-Hocquenghem Code processing to the collected data of sensor, pass through the n-k grade shift LD with feedback loop
Device obtains code word divided by generator polynomial g (x) with message polynomial u (x), and takes the remainder the check part as code word, completes
Bose-Chaudhuri-Hocquenghem Code；
Step 3: carrying out BPSK modulation to the signal obtained after Bose-Chaudhuri-Hocquenghem Code, sent out subsequently into after transmitting module power amplification
It penetrates；
Step 4: ground instrument receives the signal of transmitting module transmitting, demodulate after signal condition by shaping circuit；
Step 5: carrying out BCH decoding to the signal after demodulation, the data that decoding obtains are sent to host computer.
2. the underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technology according to claim 1 based on BPSK, feature exist
In Bose-Chaudhuri-Hocquenghem Code in step 2 specifically includes:
21, the data x acquired according to sensorn-kU (x) realizes Bose-Chaudhuri-Hocquenghem Code by shift register；
22, preceding k period, information are exported while input circuit；Start in+1 cycle clock of kth, shift LD
Data, that is, check bit Serial output in device completes first encoding；
23, each clock cycle will have a data to move into register, when total data all sequentially enters register, register
In content be Bose-Chaudhuri-Hocquenghem Code check code；
Wherein, n is code length, and k is information bit, and message polynomial is u (x), and generator polynomial is g (x), and check bit multinomial is r
(x), systematic code is C (x)=u (x) xn-k+r(x)。
3. the underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technology according to claim 1 based on BPSK, feature exist
In, the BPSK in step 3 is modulated, it specifically includes:
31, the BCH signal after coding is subjected to code conversion；
32, signal and carrier signal are then inputted into multiplier simultaneously, obtain BPSK modulation waveform.
4. the underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technology according to claim 1 based on BPSK, feature exist
In BPSK demodulation method in step 4 specifically includes:
41, ground instrument obtains the transmitting signal transmitted by stratum transmitting module by asymmetric dipole antenna；
42, first passing through preposition protection circuit prevents electric current is excessive from burning circuit, later by shaping circuit to the BPSK received
Signal is filtered enhanced processing, decays to noise；
43, the bpsk signal after filter amplifying processing is by passing through multiplier and carrier synchronization after band-pass filter
The sync carrier of device output is multiplied；If the signal received and the same phase of carrier signal, being multiplied is positive value；If the signal received
With reference signal on the contrary, being negative value after being then multiplied；
44, the signal after being multiplied filters High-frequency Interference again by low-pass filter, passes through sampling decision device and bit synchronizer
The numerical value of baseband signal is adjudicated, if positive value, can adjudicate is 1, and if negative value, then judgement is 0.
5. the underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technology according to claim 1 based on BPSK, feature exist
In BCH interpretation method in step 5 specifically includes:
51, syndrome s is calculated to the signal after demodulation1~s2t；
52, error location polynomial σ is asked according to syndrome1~σ2t；
53, the root of error location polynomial is calculated using money search method, and then determines the position that mistake occurs；
54, the value Yi on errors present is calculated, in conjunction with the position that mistake occurs, completes error correction.
6. the underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technology according to claim 1 based on BPSK, feature exist
In transmitting module in step 3 carries out signal amplification using the H bridge that 4 power MOS pipes are constituted, and H bridge is driven by two half-bridges
Dynamic chip controls, then carry out transmitting signal by asymmetric dipole antenna, to realize the communication with ground instrument.
7. the underground coal mine electromagnetic measurement while drilling Bose-Chaudhuri-Hocquenghem Code technology according to claim 1 based on BPSK, feature exist
In shaping circuit in step 4, by preposition amplification, filter circuit, programming amplifying, ADC, MCU and DAC composition；Receiver
The electric signal that terrestrial transmission comes out is received by asymmetric dipole electrode, by filtering, enhanced processing, obtains purer width
The suitable signal of degree, is sampled by ADC and gives STM32 and analyzed；DAC is used to carry out natural potential and offset voltage
It adjusts.
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Application publication date: 20190412 |