CN106788845B - A kind of clock synchronization device and method of submarine geophysics exploration instrument - Google Patents
A kind of clock synchronization device and method of submarine geophysics exploration instrument Download PDFInfo
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- CN106788845B CN106788845B CN201611213350.1A CN201611213350A CN106788845B CN 106788845 B CN106788845 B CN 106788845B CN 201611213350 A CN201611213350 A CN 201611213350A CN 106788845 B CN106788845 B CN 106788845B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
- G01V11/002—Details, e.g. power supply systems for logging instruments, transmitting or recording data, specially adapted for well logging, also if the prospecting method is irrelevant
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0644—External master-clock
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
A kind of clock synchronization device and method of submarine geophysics exploration instrument, the clock for being mainly used in habitata instrument synchronize.It only needs a underwater sound emitter, you can all within the scope of synchronous underwater acoustic communication distance to carry underwater sound device habitata instrument；By the emitting device with atomic clock, resets certain time interval and repeatedly emit underwater sound signal, habitata instrument opens reception device in the designated time, and preserves reception data；After recycling offshore instrument, receives the time using host computer multiple underwater sound signal collected to habitata instrument and accurately calculate, obtain the deviation of instrument internal time, and then be corrected to instrument data, achieve the purpose that high precision clock synchronous acquisition.
Description
Technical field
The invention belongs to marine survey technology fields, and in particular to a kind of clock of submarine geophysics exploration instrument is same
Device and method are walked, the method for being adapted to realize clock synchronization using underwater sound communication.
Background technology
In the ocean operation of submarine earthquake and electromagnetic surveying, the survey line along sea is by more instrument sinkings to different points
Position, every instrument independently work in seabed by set program.For ocean floor topographic survey, clock synchronization system is seabed
Detection instrument implements the key of seafloor data record, and the accuracy of gathered data places one's entire reliance upon the accurate of clock synchronization system
Property.And the sea water layer of huge thickness has played shielding action to GPS signal, being placed on the instrument in seabed cannot receive what satellite was sent out
GPS information.Therefore, habitata instrument can only carry out GPS to clock before dispensing and after salvaging recycling, and instrument needs after plunging into the commercial sea
Timing is carried out by itself.
To ensure that realization of the synchronous acquisition in seabed, habitata instrument will be each and all be equipped with atomic clock or high-precision
It spends up to 10-7The clock circuit of number of seconds magnitude, so that each instrument obtains the time reference consistent with GPS.Due to atomic clock price
Costliness, and one survey line needs up to a hundred instruments when submarine geophysics exploration, if each is equipped with atomic clock, atomic clock
Expense is as high as members up to a million.Currently, habitata instrument devises constant-temperature high-precision clock electricity to reach clock accuracy
Road.High precision clock circuit core problem is the stability problem of crystal oscillator device, and stability is mainly influenced by environment temperature.
Under temperature match curing conditions, frequency of oscillation can change correspondingly oscillating crystal, to cause timing error.Existing habitata instrument
All use the crystal oscillator technology with temperature compensation mostly.If the crystal oscillator with temperature compensation is wanted to realize miniaturization, quartz-crystal unit will be made
Changeable frequency amplitude becomes smaller, and temperature-compensating is more difficult, thus temperature compensating crystal oscillator all exist in actual use volume it is excessive lack
Point, power consumption is also because adjunct circuit increases.
Invention content
It synchronizes and sets in order to solve the above technical problem, the present invention provides a kind of clock of submarine geophysics exploration instrument
Standby and method, the clock for being mainly used in habitata instrument synchronize.
According to the present invention in a first aspect, provide a kind of clock synchronization device of submarine geophysics exploration instrument,
Mainly include GPS module 1., atomic clock 2., microcontroller 3., power amplification circuit 4., match circuit 5. with underwater acoustic transducer 6.,
Wherein：
1. GPS module, is used to obtain standard by the PPS signal of GPS module to clock in land water supply acoustic emission device
Initial split-second precision signal is arranged for underwater sound emitter in the whole second signal of true clock；
2. atomic clock, is used for after the completion of clock, when under water or without GPS signal, being generated by the atomic clock of itself
High-precision clock signal；
3. microcontroller is the microcontroller of whole underwater sound emitter, be used to receive the PPS signal of GPS module, and is led to
It crosses atomic clock and generates continuous high accurate clock signal, control emitter certain time emits a underwater sound synchronizing signal；
4., the 12KHZ frequency pulse signals for being used to generate microcontroller carry out power amplification, transmitting to power amplification circuit
Power will ensure that the communication maximum distance of the underwater sound signal sent out can reach 14,000 meters；Power amplification circuit uses D class power
Amplifying circuit.The present invention selects IRFP250 power tubes.
5. match circuit, is used for the load with underwater acoustic transducer and carries out impedance matching, obtain more power.Due to water
The impedance value of sonic transducer is larger, and the supply voltage of general transmitter is not very high, and radiating circuit need to use boosting transformation
Device carrys out lotus root and closes load, by carrying out analysis measurement to underwater acoustic transducer mechanical admittance curves, selects EE65 shaped iron cores, calculates equiva lent impedance
And the number of turns, make transformer；
6. underwater acoustic transducer, is used for acoustic energy and electric energy is converted mutually, imitated using the piezoelectricity of crystal piezoelectric ceramics
It answers or the magnetostrictive effect of iron-nickel alloy is come what is worked, generated and received using electrostriction effect and piezoelectric effect
Ultrasonic wave.
Second aspect according to the present invention provides a kind of clock synchronizing method of submarine geophysics exploration instrument,
The underwater sound emitter for carrying atomic clock using one, setting certain time interval repeatedly emit underwater sound signal, habitata
Instrument opens reception device in the designated time, and preserves reception data.After recycling offshore instrument, using host computer to habitata
The collected multiple underwater sound signal of instrument receives the time and is accurately calculated, and achievees the purpose that high precision clock synchronous acquisition.
Further, after the completion of habitata instrument and underwater sound emitter are all launched, in underwater sound emitter seabed
In the case that detection instrument relative position is constant, underwater sound emitter sets certain time interval and emits the multiple 12KHZ underwater sounds
Signal, habitata instrument receive signal in the designated time and preserve.
Additionally, it after recycling offshore instrument, is connect using host computer multiple underwater sound signal collected to habitata instrument
It is accurately calculated by the time, the deviation of instrument internal time is obtained, and then be corrected to instrument data, when reaching high-precision
The purpose of clock synchronous acquisition.
Preferably, to emit duration of signal as calculation window, docking is collected mail and is moved after number one by one sampled point, into line frequency
Spectrum analysis determines the position of useful signal, obtains the exact value of receiving time.
The clock synchronizing method of the submarine geophysics exploration instrument more specifically includes the following steps：
1. the first step, underwater sound emitter carry out a GPS to clock, to clock using GPS module before launching to seabed
Carry out the dispensing of normal survey line after the completion, underwater sound emitter selects supply volume according to survey line length, underwater sound emitter and
The maximum distance of habitata instrument is less than 6000 meters, ensures that the underwater sound signal received is completely and effective.Each underwater sound is sent out
Injection device is fixed on some habitata instrument and is launched, and can be recycled in this way with habitata instrument；
Second step, underwater sound emitter utilize atomic clock 2. high-precision timing, and 3. microcontroller is set as every microcontroller
The pulse signal of a hour primary 12KHZ for continuing 10ms of integral point transmitting, by power amplification circuit 4., match circuit 5.
6. module converts electric energy to acoustic energy with underwater acoustic transducer, and in seabed, underwater sound synchronizing signal is launched in timing；
Third walks, and habitata instrument uses common crystals timing, clock each hour to have deviation, and deviation is in ms amounts
Grade.Meanwhile the maximum distance of underwater sound emitter and habitata instrument is less than 6000 meters, 12KHZ underwater sounds transmission rate is about
For 1.5km/s, transmission time up to 4s.So the 1s that habitata instrument is arranged before the arrival of each integral point opens data
Acquisition starts to receive underwater sound signal, and sample rate is set as 48KHZ, after the data that 6s is preserved with 10 built-in AD, closes acquisition.This
Sample can ensure that in the data of preservation comprising the 12KHZ underwater sound signals received and preserve；
4th step, at the end of habitata, habitata instrument and underwater sound emitter recycle together.It is provided by the invention
Host computer procedure, 12KHZ underwater sound signals collected to habitata instrument are analyzed, and underwater sound emitter after acquisition is stablized
Constant with the relative position of habitata instrument, the accurate initial time of the underwater sound signal received is exactly clock sync signal,
The faint variation at acquisition receiving time interval is exactly the error of habitata instrument clock accuracy.Utilize obtained error, logarithm
According to resampling correction is carried out, the data of high precision clock synchronization are obtained.
It is compared the prior art using the technology of the present invention, the present invention has the advantage that：
1. a kind of clock synchronization device of submarine geophysics exploration instrument of offer and the method based on underwater sound communication, only
Need a underwater sound emitter for carrying atomic clock, you can all with underwater sound device sea within the scope of synchronous underwater acoustic communication distance
Bottom detection instrument need not use atomic clock or the high precision clock circuit with temperature compensation, hardware circuit on each instrument
Simply, power consumption and cost are reduced.
2. the clock synchronizing method that the present invention uses can be utilized upper after recycling offshore instrument using the method for software
Position machine accurately calculates the instrument receiving time for the multiple underwater sound signal that acquisition receives, and computational methods precision is high, does not increase
Add hardware circuit and cost, achievees the purpose that high precision clock synchronous acquisition.
Description of the drawings
Attached drawing 1 is the structural schematic block diagram of the clock synchronization device of submarine geophysics exploration instrument of the present invention.
Attached drawing 2 is the integrated circuit connection figure of the clock synchronization device of the submarine geophysics exploration instrument of the present invention.
Attached drawing 3 is the power amplification of the clock synchronization device of submarine geophysics exploration instrument of the present invention, match circuit
With underwater acoustic transducer module circuit diagram.
Attached drawing 4 is that the host computer simulation used in the present invention receives the test chart that sound signal analysis calculates.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.In addition, protection scope of the present invention only should not be limited to following specific
Structure or component or design parameter.
The present invention's provides a kind of clock synchronization device of submarine geophysics exploration instrument, includes mainly GPS moulds
Block 1., atomic clock 2., microcontroller 3., power amplification circuit 4., match circuit 5. with underwater acoustic transducer 6., wherein：
1. GPS module, is used to obtain standard by the PPS signal of GPS module to clock in land water supply acoustic emission device
Initial split-second precision signal is arranged for underwater sound emitter in the whole second signal of true clock.
2. atomic clock, is used for after the completion of clock, when under water or without GPS signal, so that it may to pass through the atom of itself
Clock generates high-precision clock signal.
3. microcontroller is the microcontroller of whole underwater sound emitter, be used to receive the PPS signal of GPS module, and is led to
It crosses atomic clock and generates continuous high accurate clock signal, control emitter certain time emits a underwater sound synchronizing signal.This
Invention is suitble to remote water sound communication using the water acoustic emission signal of 12KHZ frequencies.
4., the 12KHZ frequency pulse signals for being used to generate microcontroller carry out power amplification, transmitting to power amplification circuit
Power will ensure that the communication maximum distance of the underwater sound signal sent out can reach 14,000 meters.Power amplification circuit is that power consumption is larger
Unit, in order to reduce equipment power dissipation, meet battery cruise duration require, the efficiency of radiating circuit is that emphasis is needed to consider
's.Using D class power amplification circuits, in order to reduce power MOS pipe switching loss, sufficiently large power can be provided to load,
Suitable power MOS pipe driving circuit is selected and designs, the present invention selects IRFP250 power tubes.
5. match circuit, is used for the load with underwater acoustic transducer and carries out impedance matching, obtain more power.Due to water
The impedance value of sonic transducer is larger, and the supply voltage of general transmitter is not very high, and radiating circuit need to use boosting transformation
Device carrys out lotus root and closes load, by carrying out analysis measurement to underwater acoustic transducer mechanical admittance curves, selects EE65 shaped iron cores, calculates equiva lent impedance
And the number of turns, make transformer.In order to expeditiously pass to the electrical power of transmitting on energy converter, one in series or in parallel is needed
Inductance carries out impedance matching, and capacitive transducer is transformed to purely resistive load.
6. underwater acoustic transducer, is used for acoustic energy and electric energy is converted mutually, imitated using the piezoelectricity of crystal piezoelectric ceramics
It answers or the magnetostrictive effect of iron-nickel alloy is come what is worked, generated and received using electrostriction effect and piezoelectric effect
Ultrasonic wave.
The underwater sound emitter circuit diagram such as attached drawing 2 with atomic clock being used in the present invention.1. circuit is GPS module
GPS.SchDoc transmits GPS signal to microcontroller, the positive grade of V_GPS power supplys and GND power cathodes by I2C interface SDA and SCL
Supply voltage is provided；2. circuit is Atomic Clock.SchDoc to atomic clock, and microcontroller is connected with XTALOUT by XTALIN
Input and output, provide High Precision Crystal Oscillator signal, and the positive grade of VCC power supplys and GND power cathodes provide supply voltage；Microcontroller 3. circuit
It is the microcontroller of whole underwater sound emitter for CPU.SchDoc, connects the input and output digital signal of modules, also wrap
Containing power supply output power supply etc.；Power amplification circuit 4., match circuit be 5. ACOU_ with underwater acoustic transducer circuit 6.
The core circuit of TRANS.SchDoc and whole device, the positive grade of PWR power supplys and GND power cathodes provide supply voltage, will be single
RSPA the and RSPB pulse signals of piece machine output carry out power amplification, impedance matching, and energy conversion finally generates sound wave, with sea
Bottom detection instrument carries out underwater sound communication, achievees the purpose that clock synchronizes.
Power amplification circuit 4., match circuit 5. with underwater acoustic transducer physical circuit ACOU_TRANS.SchDoc 6. such as
Attached drawing 3, the pulse signal RSPA and RSPB of microcontroller output are that amplitude is equal, and phase differs the square-wave signal of 180 degree.
Level conversion first is carried out to the pulse signal of microcontroller output.RSPA and RSPB is separately connected 1K resistance R43 and R44
To power cathode, connect 10K resistance R27 and R33, is connected to the base stage of bipolarity triode (9013) Q8 and Q2, triode
9013 emitters connect power cathode, the cathode of connecting triode Q8 and Q2 collector to photoelectrical coupler (TLP151A) U5 and U6,
The Transistor-Transistor Logic level that microcontroller generates is converted into photoelectrical coupler TLP151A output voltage 8V level, is more than power tube IRFP250
Grid source cut-in voltage, could conducting power pipe.
Power amplification circuit 4. part, all the way the photoelectrical coupler U5 output pins VOUT 0.1K resistance R46 that connect be connected to
The grid of Q3 and Q5 power tubes, parallel resistance R23 to power cathode；The VOUT series connection of another way photoelectrical coupler U6 output pins
0.1K resistance R20 is connected to the grid of power tube Q6 and Q10, parallel resistance R31 to power cathode.Two-way power tube drain electrode difference
The both ends of the primary coil of transformer T2 are connected to, source electrode connects three shunt resistances R66, R67, R68 to power cathode.Transformation
The both ends of the primary coil of device T2 are separately connected resistance R69, capacitance C29 to high-voltage power supply anode, and are connected respectively to two
The cathode of diode (P6KE-150A) D21 and D22, D21 and D22 anodes are connected to power cathode.The primary coil of transformer T2
Centre tap connection high-voltage power supply anode, four 15000 μ F capacitances in parallel to power cathode.Two-way power tube IRFP250
Input signal is rectangular wave, and input signal amplitude is equal, and phase differs 180 degree.When the input signal of Q3 and Q5 pipes is high level
When, hourglass source electrode conducting has drain current to flow through transformer, current direction is upward；When Q10 and Q6 pipe input signals are
When high level, hourglass source electrode conducting has drain current to flow through transformer, current direction is downward；Q3 and Q5 pipes are defeated at this time
It is low level to enter signal, is in cut-off state.It is converted by the electromagnetic energy of transformer T2, transformer is the two such half period
The signal that signal is combined into a complete cycle is added in load both ends.This D classes power amplifier output power is related to supply voltage,
Use MOSFET as power amplifying device, the input internal resistance of MOSFET is high, and output resistance is small, and carrying load ability is strong.MOSFET works
Make on off state, power utilization is efficient.
Match circuit 5. with underwater acoustic transducer 6. part, the secondary coil both ends inductance L4 in parallel of transformer T2, one
One inductance L5 of end series connection, impedance matching is carried out with underwater acoustic transducer.The other end connection diode D24 anodes and diode of L5
The anode of the cathode of D23, diode D24 cathode and diode D23 are connected to the positive HOT_PT of underwater acoustic transducer.Resistance R1 with
Capacitance C1 is in parallel, is connected in series to diode D1, D2 of two mutually opposing parallel connection, then be parallel to underwater acoustic transducer anode HOT_PT and
Cathode GND both ends denoisings.Since piezoelectric ceramic transducer is capacity load, need to increase inductance when being tuned matching
Carry out the capacitive reactance in neutralizing circuit, two kinds of forms of one inductance of series connection and an inductance in parallel may be used.The energy converter used
Mechanical admittance curves and the practical maximum output pulse power of power tube, the primary and secondary coil turn of calculating transformer and need connect or simultaneously
The equivalent inductance amount of connection, output high-voltage signal HOT_PT and GND are connected to underwater acoustic transducer both ends, convert electric energy to acoustic energy.
When underwater sound emitter emits underwater sound signal synchronization time of regular length, habitata instrument is received by the underwater sound
Device preserves the underwater sound signal received.Underwater sound emitter launch time keeps base with habitata instrument receiving time
This is consistent, and receiving time is determined according to clock maximum deviation and underwater sound communication transmission maximum time, it is ensured that habitata instrument energy
It receives effective underwater sound complete signal and preserves, achieve the purpose that the underwater sound synchronizes.
The clock synchronization device of the submarine geophysics exploration instrument of aforementioned present invention can be used to be synchronized into row clock
Method, with very high precision.The clock synchronizing method of the submarine geophysics exploration instrument includes following step
Suddenly：
1. the first step, underwater sound emitter carry out a GPS to clock, to clock using GPS module before launching to seabed
Carry out the dispensing of normal survey line after the completion, underwater sound emitter selects supply volume according to survey line length, underwater sound emitter and
The maximum distance of habitata instrument is less than 6000 meters, ensures that the underwater sound signal received is completely and effective.Each underwater sound is sent out
Injection device is fixed on some habitata instrument and is launched, and can be recycled in this way with habitata instrument；
Second step, underwater sound emitter utilize atomic clock 2. high-precision timing, and 3. microcontroller is set as every microcontroller
The pulse signal of a hour primary 12KHZ for continuing 10ms of integral point transmitting, by power amplification circuit 4., match circuit 5.
6. module converts electric energy to acoustic energy with underwater acoustic transducer, and in seabed, underwater sound synchronizing signal is launched in timing；
Third walks, and habitata instrument uses common crystals timing, clock each hour to have deviation, and deviation is in ms amounts
Grade.Meanwhile the maximum distance of underwater sound emitter and habitata instrument is less than 6000 meters, 12KHZ underwater sounds transmission rate is about
For 1.5km/s, transmission time up to 4s.So the 1s that habitata instrument is arranged before the arrival of each integral point opens data
Acquisition starts to receive underwater sound signal, and sample rate is set as 48KHZ, after the data that 6s is preserved with 10 built-in AD, closes acquisition.This
Sample can ensure that in the data of preservation comprising the 12KHZ underwater sound signals received and preserve；
4th step, at the end of habitata, habitata instrument and underwater sound emitter recycle together.It is provided by the invention
Host computer procedure, 12KHZ underwater sound signals collected to habitata instrument are analyzed, and underwater sound emitter after acquisition is stablized
Constant with the relative position of habitata instrument, the accurate initial time of the underwater sound signal received is exactly clock sync signal,
The faint variation at acquisition receiving time interval is exactly the error of habitata instrument clock accuracy.Utilize obtained error, logarithm
According to resampling correction is carried out, the data of high precision clock synchronization are obtained.
The Computing Principle of host computer procedure provided by the invention is the piecewise range value for calculating 12KHZ in data spectrum, frequency
When rate is that 12KHZ signals are most strong, illustrate the signal for having received 12KHZ.Due to only needing to calculate the single-frequency received
Spectrum amplitude, therefore Analysis of Magnitude-Frequency Characteristic is carried out using Goertzel transformation, it is a kind of fast algorithm of DFT, it can be from given
The energy of a certain set specific frequency signal is found out in sampling.
The duration for emitting underwater sound signal is t, and sample_rate is sample rate, and target_freq is frequency spectrum to be calculated
Frequency, be calculated that block length is N, constant k and frequency spectrum angular frequency w are：
N=t*sample_rate
K=(N*target_freq)/sample_rate
W=(2* π/N) * k
At the beginning of calculating, it is necessary to which Q1 and Q2 are initialized as 0.Each value is required for according to following three etc. later
Formula is calculated, and wherein Q0, Q1, Q2 are the intermediate variable calculated, and cos is to calculate cosine, and sample is initially first sampling
The value of point：
Q0=2*cos (w) * Q1-Q2+sample
Q2=Q1
Q1=Q0
It calculates each time, sample is the value of next sampled point.After carrying out n times calculating, first can be obtained
Frequency amplitude H to be measured is in the sampled data that one segment length of sampled point to n-th sampled point is N：
H=Q1-Q2*cos (w)
The N+1 times calculating can obtain to be measured in the data that the length from second sampled point to the N+1 sampled point is N
Frequency amplitude, and so on, frequency amplitude to be measured in the data that each segment length of whole segment data is N can be obtained, is drawn out
12KHZ amplitude curve figures.It finds peak and can be obtained accurate underwater sound receiving time.
Attached drawing 4 is the test chart for the underwater sound signal that simulation receives.It is 48KHZ to simulate one section of sample rate, and length is
The data of 100ms.By the noise signal superposition of the 12KHZ signals and one section of 100ms of one section of noiseless 10ms, simulates seabed and connect
The underwater sound signal received.Depict a 12KHZ amplitude curve figure by above-mentioned computational methods, it can be seen that curve peak with
12KHZ receiving points correspond to, and can obtain accurate receiving time.By the knot for repeatedly simulating different noise signals and actual test
Fruit obtains, and the time precision of test meets the requirements.After obtaining the repeatedly precise time of reception underwater sound signal, due to transmitting underwater sound letter
What the high-precision atomic clock of number time generated, it is primary that time interval setting is that whole hour sends, and stablizes underwater sound transmitting dress after acquisition
Set constant with the relative position of habitata instrument, the faint variation at acquisition receiving time interval is exactly habitata instrument clock
The error of precision.Using obtained error, resampling correction is carried out to data, the data of high precision clock synchronization is obtained, reaches
The purpose of clock synchronous acquisition.
A underwater sound emitter for carrying atomic clock is only used only in method provided by the invention based on underwater sound communication,
All within the scope of synchronous underwater acoustic communication distance it can carry underwater sound device habitata instrument.Because atomic clock is expensive, and
One survey line needs up to a hundred instruments, this method that need not use atomic clock on each instrument when submarine geophysics is explored
Or the high precision clock circuit with temperature compensation, in seabed when cloth survey line, as long as every a distance, cloth penetrates the water with atomic clock
Acoustic emission device, so that it may to be synchronized to all habitata instruments in underwater sound transmission range, greatly reduce the number of atomic clock
Amount, need not also redesign high precision clock circuit or the crystal oscillator with temperature compensation, hardware circuit is simple, reduces power consumption and cost.
Underwater sound emitter can be fixed or be integrated on habitata instrument, and cost recovery is reduced.Dress is received for having the underwater sound
The habitata instrument set need not change circuit structure substantially, can acquire the water of certain time by updating Software for Design
Sound data simultaneously preserve.After recycling offshore instrument, using software method using host computer to acquisition receive it is multiple
Underwater sound signal carries out analysis calculating, by repeatedly simulating the verification with actual test, has reached high precision clock synchronous acquisition
Purpose realizes the high precision clock synchronous acquisition of habitata instrument.
Underwater sound emitter used in the present invention with atomic clock, mainly include GPS module, atomic clock, microcontroller,
The parts such as power amplification circuit, match circuit and underwater acoustic transducer.GPS module in land water supply acoustic emission device to clock, it is right
After the completion of clock, so that it may to generate high-precision clock signal by the atomic clock of itself.In scm software design, setting is certain
Time emits a underwater sound signal and is synchronized into row clock.The present invention uses the water acoustic emission signal of 12KHZ frequencies, is suitble to long-range water
Sound communication.Underwater sound radiating circuit is that the unit that power consumption is larger in underwater sound emitter meets battery to reduce equipment power dissipation
Cruise duration require, the efficiency of radiating circuit needs emphasis to consider.Therefore PWM (pulse width modulation) form D is selected
Class power amplification circuit, the digital signal conversion that microcontroller is generated remove control high-power switch device at the pulse signal of PWM
On/off signal power amplifier, also referred to as switching amplifier have efficient, small, low distortion, frequency response curve good
Outstanding advantages of.The mechanical admittance curves of measurement transducer, calculating transformer parameter and matching inductance, for specific energy converter, if
Match circuit is counted, pulse transmission power can reach 300W, communicate 14,000 meter of maximum distance.
For underwater sound emitter when seabed emits underwater sound signal synchronization time of regular length, habitata instrument passes through water
Sound reception device preserves the underwater sound signal received.Underwater sound emitter launch time and habitata instrument receiving time
Keep almost the same, receiving time is determined according to clock maximum deviation and underwater sound communication transmission maximum time, it is ensured that habitata
Instrument can receive effective underwater sound complete signal and preserve.
Host computer procedure provided by the invention, 12KHZ underwater sound signal receiving times collected to habitata instrument into
Row accurately calculates, and obtains the clock jitter of instrument, carries out resampling correction to instrument data, reaches high precision clock synchronous acquisition
Effect.Computing Principle is that the docking collection of letters number carries out a spectrum analysis, and when frequency is that 12KHZ signals are most strong, explanation has received
The signal of 12KHZ.Due to only needing to calculate the spectrum amplitude of single-frequency received, carried out using Goertzel transformation
Analysis of Magnitude-Frequency Characteristic, this is a kind of fast algorithm of DFT, and the energy of a certain set specific frequency signal can be found out from given sampling
Amount.To emit duration of signal as calculation window, docking is collected mail and is moved after number one by one sampled point, when being moved to comprising receiving water
When acoustical signal, range value starts to increase；When be moved to data just completely include receive underwater sound signal when, range value reaches most
Greatly, it may be determined that accurate underwater sound receiving time.
After obtaining the repeatedly precise time of reception underwater sound signal, due to the high-precision atomic clock production of transmitting underwater sound signal time
Raw, underwater sound emitter and the relative position of habitata instrument are constant after stable acquisition, acquire the micro- of receiving time interval
Weak variation is exactly the error of habitata instrument clock accuracy.Using obtained error, resampling correction is carried out to data, is obtained
The data that high precision clock synchronizes, have achieved the purpose that clock synchronous acquisition.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Those skilled in the art is appreciated that without departing substantially from appended right
It is required that in the case of the spirit and scope of the present invention of definition, various modifications can be made in form and detail.
Claims (2)
1. a kind of clock synchronization device of submarine geophysics exploration instrument, include mainly GPS module 1., atomic clock 2.,
Microcontroller 3., power amplification circuit 4., match circuit 5. with underwater acoustic transducer 6.,
1. GPS module, is used to obtain accurately clock by the PPS signal of GPS module in land water supply acoustic emission device
Initial split-second precision signal is arranged for underwater sound emitter in the whole second signal of clock；
2. atomic clock, is used for after the completion of clock, when under water or without GPS signal, being generated by the atomic clock of itself high-precision
The clock signal of degree；
3. microcontroller is the microcontroller of whole underwater sound emitter, be used to receive the PPS signal of GPS module, and passes through original
Secondary clock generates continuous high accurate clock signal, and control emitter certain time emits a underwater sound synchronizing signal；
4., the certain frequency pulse signal for being used to generate microcontroller carries out power amplification, power amplification to power amplification circuit
Circuit uses D class power amplification circuits；
5. match circuit, is used for the load with underwater acoustic transducer and carries out impedance matching, radiating circuit uses step-up transformer
Lotus root closes load；
6. underwater acoustic transducer, is used for acoustic energy and electric energy is converted mutually, using crystal piezoelectric ceramics piezoelectric effect or
The magnetostrictive effect of iron-nickel alloy generates using electrostriction effect and piezoelectric effect and receives ultrasound come what is worked
Wave；
4. 12KHZ frequency pulse signals that power amplification circuit is used to generate microcontroller carry out power amplification；Power amplification electricity
Road uses IRFP250 power tubes；
A underwater sound emitter for carrying atomic clock, setting certain time interval is wherein used repeatedly to emit underwater sound signal,
Habitata instrument opens reception device in the designated time, and preserves reception data；After recycling offshore instrument, host computer pair is utilized
The collected multiple underwater sound signal of habitata instrument receives the time and is accurately calculated；Habitata instrument and underwater sound transmitting dress
It sets after the completion of all launching, in the case where underwater sound emitter habitata instrument relative position is constant, underwater sound emitter is set
Determine certain time interval and emit multiple 12KHZ underwater sound signals, habitata instrument receives signal in the designated time and preserves；It returns
After receiving offshore instrument, receives the time using host computer multiple underwater sound signal collected to habitata instrument and accurately counted
It calculates, obtains the deviation of instrument internal time, and then be corrected to instrument data；
, to emit duration of signal as calculation window, docking is collected mail and is moved after number one by one sampled point, carries out spectrum analysis, really for it
The position for determining useful signal obtains the exact value of receiving time.
2. a kind of clock synchronizing method of submarine geophysics exploration instrument uses the seabed described in the claims 1
The clock synchronization device of geophysical exploration instrument comprising following steps：
The first step, 1. underwater sound emitter is being launched to carrying out a GPS before seabed to clock using GPS module, complete to clock
At the rear dispensing for carrying out normal survey line, underwater sound emitter selects supply volume according to survey line length；Each underwater sound transmitting dress
It sets to be fixed on some habitata instrument and be launched；
Second step, underwater sound emitter utilize atomic clock 2. high-precision timing, and 3. microcontroller is set as each small microcontroller
When the primary 12KHZ for continuing 10ms of integral point transmitting pulse signal, by power amplification circuit 4., match circuit 5. and water
6. module converts electric energy to acoustic energy to sonic transducer, and in seabed, underwater sound synchronizing signal is launched in timing；
Third walks, and habitata instrument uses common crystals meter, habitata instrument that the 1s before the arrival of each integral point is arranged
Data acquisition is opened, starts to receive underwater sound signal；
4th step, at the end of habitata, habitata instrument and underwater sound emitter recycle together, utilize the underwater sound received
Data are carried out resampling correction, obtained high-precision by the accurate initial time of signal and the faint variation at acquisition receiving time interval
Spend the data that clock synchronizes.
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| CN108288961A (en) * | 2018-01-11 | 2018-07-17 | 福建星海通信科技有限公司 | A kind of low frequency, broadband, high-power underwater sound matching network circuit |
| CN108494401B (en) * | 2018-03-08 | 2020-07-10 | 山东大学 | Radio observation array and clock synchronization method |
| CN108255048A (en) * | 2018-03-21 | 2018-07-06 | 中国科学院深海科学与工程研究所 | Based on the underwater time calibration inductively communicated and synchronization system and method |
| CN109188444B (en) * | 2018-10-10 | 2023-04-11 | 中国船舶重工集团公司七五0试验场 | Submarine underwater acoustic response type positioning method and system based on synchronous signal system |
| CN110048795B (en) * | 2019-03-26 | 2020-06-16 | 中国科学院地质与地球物理研究所 | Method and device for acquiring data clock by seismograph |
| CN111812693B (en) * | 2020-06-28 | 2021-04-20 | 中国科学院地质与地球物理研究所 | Long-baseline time scale positioning array and control method thereof |
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| CN101639538A (en) * | 2008-07-30 | 2010-02-03 | 中国科学院地质与地球物理研究所 | Seven-channel multi-functional submarine seismograph |
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| CN101769778A (en) * | 2008-12-31 | 2010-07-07 | 中国神华能源股份有限公司 | Real-time monitoring method and system of water depth in port channel |
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| CN101639538A (en) * | 2008-07-30 | 2010-02-03 | 中国科学院地质与地球物理研究所 | Seven-channel multi-functional submarine seismograph |
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| CN101644913A (en) * | 2009-08-20 | 2010-02-10 | 中国科学院声学研究所 | Underwater time service and synchronization method and system thereof |
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