CN107145186A - A kind of controllable mode signal source of borehole radar step frequency - Google Patents
A kind of controllable mode signal source of borehole radar step frequency Download PDFInfo
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- CN107145186A CN107145186A CN201710217485.3A CN201710217485A CN107145186A CN 107145186 A CN107145186 A CN 107145186A CN 201710217485 A CN201710217485 A CN 201710217485A CN 107145186 A CN107145186 A CN 107145186A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
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Abstract
The invention discloses a kind of controllable mode signal source of borehole radar step frequency, belong to the hardware component units of borehole radar logging system.The signal source includes radio-frequency transmissions source and local vibration source two major parts, is respectively used to produce transmission signal and local oscillation signal, and radio-frequency transmissions source is ensured the coherent pulse signalf of radiofrequency signal and local oscillation signal with local vibration source by Synchronization Control clock.For the signal source in the Borehole Directional Radar System for the step frequency system of Depth Logging, the present invention has the advantages that pattern is controllable, ns grade fast frequencies switch, controllable step value and big output signal power and wide frequency range.
Description
Technical field
The invention belongs to the hardware component units of borehole radar logging system, mainly apply to produce broadband, high-power
Step ped-frequency radar signal, output step value and reference frequency output can be with program control, and output mode can be continuous in frequency modulation
Between ripple, stepping continuous wave, arteries and veins controllable adjustment is carried out between stepping frequency wave.Radiofrequency signal is produced all the way, and local oscillator letter is produced all the way
Number, collectively constitute signal source.
Background technology
Increasingly increase with the mankind to the subterranean resource demand such as oil, gas, people are descending the research of Detection Techniques over the ground
Increasingly increase.This is accomplished by furtheing investigate resource distribution and geological structure situation, and too high experimental cost, compels to be essential
Want a kind of pinpoint accuracy, efficient logging method.Borehole radar logging system is that borehole radar is applied into oil well logging
Product, its working mechanism is to propagate and then detect the discontinuous geology of electromagnetic property in underground and rock stratum by electromagnetic wave
It is abnormal, while high-resolution is obtained, 5~10m of well week detection range is can reach, compared to traditional 2~3m of logging method
Detection range it is farther, therefore as the hot topic studied both at home and abroad.
Current most of borehole radar belongs to pulse system, but this radar be difficult take into account high-resolution and
The requirement of remote detection range, and corresponding frequency domain stepping radar can be accomplished to high-resolution and high detection range
Requirement, the radar is discontinuous when running into electromagnetic property by launching the signal of high-power, ultra wide band, small step value
Its reflection characteristic or transmission characteristic change during underground medium, finally pass through pulse pressure from back wave or transmitted waveform again
Technology extracts target information.The system realizes the positioning of target, experiment by way of transmitting antenna and reception antenna group battle array
Middle stratum media is for the maximum reachable 90dB of attenuation of radar wave, and this requires signal source to have high power output, and
The uniformity of power output is kept during frequency changes.So, emission source closes important as pole in radar emission system
Part, the quality of its performance has vital effect to the service behaviour of whole radar system quality, it is therefore desirable to close
The high performance signal source of design of reason is to meet the requirement of radar system.
The content of the invention
Present invention is generally directed to the signal source in the Borehole Directional Radar System for the step frequency system of Depth Logging,
It should have big transmission power, wide frequency band range, small step frequency value, small design volume and controllable stepping
Frequency mode.In summary feature, devise it is a have that pattern is controllable, ns grade fast frequencies switch, controllable step value and
Big output signal power and wide frequency range.
The technical solution adopted by the present invention is：
A kind of controllable mode signal source of borehole radar step frequency, the signal source includes：Radio-frequency transmissions source and local vibration source two
Bulk, is respectively used to produce transmission signal and local oscillation signal, and radio-frequency transmissions source is ensured with local vibration source by Synchronization Control clock
The coherent pulse signalf of radiofrequency signal and local oscillation signal.
The local vibration source includes power transfer module, high-frequency clock module, the comprehensive module of DDS frequencies, rf gain adjusting module
And main control unit module；Described power module is converted to input power the level value of modules needs, realizes to each
The function of supplying power of individual module；Described high frequency clock module receives the initialization of register instruction from main control unit module, and
Produce high frequency clock signal；When the frequency control word FTW that the described comprehensive module of DDS frequencies is sent according to main control unit module is to high frequency
Clock signal carries out scaling down processing, the broadband step frequency signal of modulating mode needed for producing；Then the broadband step frequency signal
The rf gain adjusting module constituted through amplifier and numerical-control attenuator, realizes the power to each point-frequency signal of final output
Value adjustment；Described main control unit module realizes the adjustment to output power value.
The radio-frequency transmissions source includes power transfer module, high-frequency clock module, the comprehensive module of DDS frequencies, rf gain adjustment
Module, power amplifier module, power detection module and main control unit module；Input power is converted to each by described power module
The level value that module needs, realizes the function of supplying power to modules；Described high frequency clock module, which is received, comes from main control unit
The initialization of register instruction of module, and produce high frequency clock signal；The described comprehensive module of DDS frequencies is sent out according to main control unit module
The frequency control word FTW sent carries out scaling down processing to high frequency clock signal, the broadband step frequency letter of modulating mode needed for producing
Number；Then the rf gain adjusting module that the broadband step frequency signal is constituted through amplifier and numerical-control attenuator, is realized to most
The performance number adjustment of each point-frequency signal of output eventually；Broadband step frequency signal is realized to the signal work(through power amplifier module afterwards
The further amplification of rate value；Described power detector, carries out power detection to the output signal after power amplifier, obtains one
Level value；The level value is fed back to main control unit module again, and main control unit module controls radio frequency according to the change of level value
Gain regulation module, is finally consistent the output power value at each frequency.
Compared with radio-frequency transmissions source, local vibration source rear end does not contain the closed power of power amplifier module and power detection module composition
Adjustment member, but major part is consistent.
The high frequency clock module can produce 135MHZ-4.4GHZ clock signal.
The control that the comprehensive module of the DDS frequencies can receive main control unit module produces CW with frequency modulation, stepping continuous wave, arteries and veins
Between three kinds of different modulating modes such as stepping frequency wave, can also be right in addition to the modulation of different mode is carried out to the frequency of signal
The amplitude of output signal is modulated with phase.
Further, the signal source is placed on inside cavity, and has carried out Isolated Shield to modules, effectively reduces
Electromagnetic interference, and there is obvious effect to the radiating of system.
The rf gain adjusting module includes amplifier and numerical-control attenuator, main to complete to export the comprehensive module of DDS frequencies
Signal power is amplified and power adjustment, power output is adjusted to certain value.
The low-power stairstep signal of output is amplified to sufficiently large performance number by the power amplifier module, and by sufficiently large work(
Rate value is fed back into power detection module.
The power detection module, by the signal input power wave detector after power amplifier, and the level value after detection is anti-
Feed main control unit module.
The main control unit module, is sent corresponding gain control to rf gain adjusting module by value of feedback and referred to
Order, makes performance number of the signal of final output at each frequency remain a definite value.The finger from host computer can also be received
Order, the pulse width realizing the frequency range the comprehensive module output signal of DDS frequencies, step value, performance number, arteries and veins under step mode
Etc. the control of parameter.
Beneficial effect：The controllable mode signal source of borehole radar step frequency that the present invention is provided is exportable flat more than 10W
Equal power, can control to adjust the pattern (totally three kinds of switch modes) of output signal by main control unit module, can be applied to
Different application environments.Frequency range is wider：DC-1500MHZ, frequency step value is adjustable, and by rf gain control module, work(
Amplification module, power detection module, the closed power gain adjustment circuit of main control unit module composition, can make at each frequency
Performance number reaches unanimously, while also having ns grades of fast frequency switching time.By the reasonable design to modules, entirely
Signal source compact, can device in a diameter of 50mm cylinder.
Brief description of the drawings
The theory diagram of Fig. 1 step frequency radar systems
Fig. 2 radio-frequency transmissions source structure schematic diagrames.
Fig. 3 local vibration source structural representations.
Embodiment
As shown in Figure 1 be whole step frequency radar system theory diagram, it can be seen that radio-frequency transmissions source with
Local vibration source is the important component of whole hardware system, and rf gain adjusting module is contained in radio-frequency transmissions source and afterbody is containing active
Putting part is used for the index 20W of the power ascension of the step frequency signal at each frequency of output to system requirements.And by same
The local vibration source of step control clock control is only responsible to produce the local oscillation signal of one and radio-frequency transmissions source coherent, and local oscillation signal is put
Arrive a certain value+17dBm specified greatly (this mainly considers some functions of selected frequency mixer).Also be exactly transmitting antenna with
Reception antenna, the radiofrequency signal for launching stepping is sent in receiver, will connect with receiving the echo-signal after being reflected through target
The weak echo signal received first carries out power gain control processing and carries out down-converted with local oscillation signal again, finally, by
Frequency signal is input in quadrature demodulator carries out quadrature demodulation processing to it, finally give the digital orthogonal baseband signals of four tunnel difference to
Collection plate carries out the collection and reconstruction of signal.
It is illustrated in figure 2 the overall structure diagram in radio-frequency transmissions source.The radio-frequency transmissions source include high frequency clock module,
The modulation module to output signal frequency of the compositions such as the comprehensive module of DDS frequencies, main control unit module；Rf gain adjusting module, work(
The closed power adjusting module of the compositions such as amplification module, power detection module, main control unit module；Power module carries for modules
For required operating voltage.The radio-frequency transmissions source can be produced from DC-1500MHZ, the adjustable stepping frequency domain letter of step frequency value
Number, possess ns grades of frequency error factor speed, and overall width is controlled within 30mm with height.Adopt in whole radio-frequency transmissions source
Modules are isolated with cavity, the isolation design of cavity effectively reduces electromagnetic interference, while having radiating effect.
It is illustrated in figure 3 local vibration source structural representation.The purpose of the local vibration source be produce it is corresponding with radiofrequency signal all the way
Local oscillation signal, make it with radiofrequency signal during the entire process of frequency hopping, it is each correspondence frequency at difference be one
The intermediate frequency value of determination, so, the local oscillation signal produced herein does not need too high power, simply according to frequency mixer pair in receiver
The requirement of local oscillation signal power appropriate power output to be adjusted into+17dBm.The local vibration source can also be produced from DC- simultaneously
1500MHZ, the adjustable stepping frequency-region signal of step frequency value possesses ns grades of frequency error factor speed, and overall width with it is high
Degree is controlled within 30mm and whole local vibration source is isolated modules using cavity, and the isolation design of cavity effectively drops
Low electromagnetic interference, while having radiating effect.
The outside input of the power transfer module, the radio-frequency transmissions source and local vibration source is+12V DC, and inside chip needs
+ 5VDC, -5V DC ,+3.3V, therefore+12V can be converted to+5V, -5V ,+3.3V by the power transfer module.
The clock signal that the high frequency clock module produces 3.5GHZ supplies the comprehensive module of follow-up DDS frequencies.
The control that the comprehensive module of the DDS frequencies receives main control unit module produces CW with frequency modulation, stepping continuous wave, arteries and veins spacer step
Enter three kinds of different modulating modes such as frequency wave, can also be to output in addition to the modulation of different mode is carried out to the frequency of signal
The amplitude of signal is modulated with phase.
The rf gain adjusting module includes 20dB amplifier and 0 and arrives -31.5dB, the numerical control attenuation of 0.5dB steppings
Device, it is main to complete to be amplified the comprehensive module output signal power of DDS frequencies and power adjustment, make the letter entered before power amplifier module
Number performance number reaches+17dBm.
The low-power stairstep signal of output is amplified to 20W performance number by the power amplifier module, and by sufficiently large power
Value is fed back into power detection module.
The power detection module, by the signal input power wave detector after power amplifier, and the level value after detection is anti-
Feed main control unit module.
The main control unit module, corresponding gain control is sent by different values of feedback to rf gain adjusting module
System instruction, makes performance number of the signal of final output at each frequency remain 20W.The finger from host computer can also be received
Order, the pulse width realizing the frequency range the comprehensive module output signal of DDS frequencies, step value, performance number, arteries and veins under step mode
Etc. the control of parameter.
High-frequency clock module, the comprehensive module of DDS frequencies, main control unit module etc. constitute the modulation mould to output signal frequency
Block, can be according to the demand of detection, the modulating mode of any switching laws output signal under three kinds of modulating modes；Output after modulation
Closed power adjustment of the signal through compositions such as rf gain adjusting module, power amplifier module, power detection module, main control unit modules
Module, 20W is arrived by the performance number lifting at each output frequency.
What radio-frequency transmissions source and the local vibration source of the present invention can be realized at each frequency mutually hot-tempered is superior to -100dBc/Hz
10KHz, and the performance that optional frequency range is exported in the range of DC-1500MHZ, and mean power can reach 20W, can meet
High resolution requirement, and detection demand at a distance can be met.
Numerical-control attenuator is the key point of rf gain adjusting module, 6 grades of attenuations be respectively 16dB, 8dB, 4dB,
2dB, 1dB, 0.5dB, the minimal attenuation amount of selection are determined before the gain stepping of receiver front end, therefore the receiver of the present invention
Hold gain stepping adjustable between 0.5dB~16dB.6 grades of attenuations of digital step attenuator provided by main control unit module 6
Position control signal directly controls switching, attenuation can be adjusted by combining, and then change output signal at each frequency
Gain.
The reaction type closed loop being made up of rf gain module, power amplifier module, power detection module and main control unit module etc.
Power regulation module, can receive the broadband stairstep signal produced from the comprehensive module of DDS frequencies, and carry out further power to it and put
Greatly, by the signal input power wave detector after power amplifier, and the value after detection is fed back into main control unit module, main control unit mould
Block sends corresponding gain control instruction by judging value of feedback, and then to rf gain adjusting module, makes final defeated
Performance number of the signal gone out at each frequency remains a definite value.
Claims (6)
1. a kind of controllable mode signal source of borehole radar step frequency, the signal source includes：Radio frequency for producing transmission signal
Emission source and the local vibration source for producing local oscillation signal, and radio-frequency transmissions source ensures radiofrequency signal with local vibration source by Synchronization Control clock
With the coherent pulse signalf of local oscillation signal；
The local vibration source include power transfer module, high-frequency clock module, the comprehensive module of DDS frequencies, rf gain adjusting module and
Main control unit module；The power module is converted to input power the level value of modules needs, realizes to modules
Function of supplying power；The high frequency clock module receives the initialization of register instruction from main control unit module, and produces high frequency
Clock signal；The frequency control word FTW that the described comprehensive module of DDS frequencies is sent according to main control unit module enters to high frequency clock signal
Row scaling down processing, the broadband step frequency signal of modulating mode needed for producing；Then the broadband step frequency signal is through amplifier
The rf gain adjusting module constituted with numerical-control attenuator, realizes and the performance number of each point-frequency signal of final output is adjusted；
The main control unit module also realizes the adjustment to output power value；
The radio-frequency transmissions source include power transfer module, high-frequency clock module, the comprehensive module of DDS frequencies, rf gain adjusting module,
Power amplifier module, power detection module and main control unit module；Input power is converted to modules by described power module
The level value needed, realizes the function of supplying power to modules；Described high frequency clock module, which is received, comes from main control unit module
Initialization of register instruction, and produce high frequency clock signal；What the described comprehensive module of DDS frequencies was sent according to main control unit module
Frequency control word FTW carries out scaling down processing to high frequency clock signal, the broadband step frequency signal of modulating mode needed for producing；So
The rf gain adjusting module that the broadband step frequency signal is constituted through amplifier and numerical-control attenuator afterwards, is realized to final output
Each point-frequency signal performance number adjustment；Broadband step frequency signal is realized to the signal power value through power amplifier module afterwards
Further amplification；Described power detector, carries out power detection to the output signal after power amplifier, obtains a level
Value；The level value feeds back to main control unit module again, and main control unit module controls rf gain to adjust according to the change of level value
Module, is finally consistent the output power value at each frequency.
2. a kind of controllable mode signal source of borehole radar step frequency as claimed in claim 1, it is characterised in that：The high frequency
Clock module can produce 135MHZ-4.4GHZ clock signal.
3. a kind of controllable mode signal source of borehole radar step frequency as claimed in claim 1, it is characterised in that：The DDS
Frequently comprehensive module receive main control unit module control produce CW with frequency modulation, stepping continuous wave, three kinds of stepping frequency wave is not between arteries and veins
With modulating mode, can also be to the amplitude and phase of output signal in addition to the modulation of different mode is carried out to the frequency of signal
It is modulated.
4. a kind of controllable mode signal source of borehole radar step frequency as claimed in claim 1, it is characterised in that：The signal source
It is placed between inside cavity, and modules and is provided with Isolated Shield.
5. a kind of controllable mode signal source of borehole radar step frequency as claimed in claim 1, it is characterised in that：The power amplifier
The low-power stairstep signal of output is amplified to the performance number of needs by module, and the performance number of needs is fed back into power detection mould
Block.
6. a kind of controllable mode signal source of borehole radar step frequency as claimed in claim 1, it is characterised in that：The master control
Unit module, sends corresponding gain control instruction to rf gain adjusting module by value of feedback, makes the signal of final output
Performance number at each frequency remains a definite value；The instruction from host computer can be also received, is realized to the comprehensive module of DDS frequencies
The control of pulse width parameter between the frequency range of output signal, step value, performance number, arteries and veins under step mode.
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| CN201710217485.3A CN107145186B (en) | 2017-04-05 | 2017-04-05 | A kind of controllable mode signal source of borehole radar step frequency |
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| CN201710217485.3A CN107145186B (en) | 2017-04-05 | 2017-04-05 | A kind of controllable mode signal source of borehole radar step frequency |
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| CN107145186A true CN107145186A (en) | 2017-09-08 |
| CN107145186B CN107145186B (en) | 2019-04-05 |
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| JP2006160161A (en) * | 2004-12-09 | 2006-06-22 | Ntt Advanced Technology Corp | Wayside coil sensing device |
| CN101702018A (en) * | 2009-11-12 | 2010-05-05 | 中国电子科技集团公司第四十一研究所 | Calibrating method for big modulation bandwidth linear FM signal frequency response |
| CN202077035U (en) * | 2011-02-28 | 2011-12-14 | 南京新联电讯仪器有限公司 | Composite function signal generator with functions of sweep generator |
| CN104734656A (en) * | 2013-12-24 | 2015-06-24 | 苏州普源精电科技有限公司 | Radio frequency signal source with amplitude modulation and automatic level control functions |
| CN104767374A (en) * | 2015-03-30 | 2015-07-08 | 中国石油天然气集团公司 | High-power signal emission control method based on DDS |
| CN105403870A (en) * | 2015-12-02 | 2016-03-16 | 中国电子科技集团公司第四十一研究所 | General signal generator for radar target simulation |
-
2017
- 2017-04-05 CN CN201710217485.3A patent/CN107145186B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006160161A (en) * | 2004-12-09 | 2006-06-22 | Ntt Advanced Technology Corp | Wayside coil sensing device |
| CN101702018A (en) * | 2009-11-12 | 2010-05-05 | 中国电子科技集团公司第四十一研究所 | Calibrating method for big modulation bandwidth linear FM signal frequency response |
| CN202077035U (en) * | 2011-02-28 | 2011-12-14 | 南京新联电讯仪器有限公司 | Composite function signal generator with functions of sweep generator |
| CN104734656A (en) * | 2013-12-24 | 2015-06-24 | 苏州普源精电科技有限公司 | Radio frequency signal source with amplitude modulation and automatic level control functions |
| CN104767374A (en) * | 2015-03-30 | 2015-07-08 | 中国石油天然气集团公司 | High-power signal emission control method based on DDS |
| CN105403870A (en) * | 2015-12-02 | 2016-03-16 | 中国电子科技集团公司第四十一研究所 | General signal generator for radar target simulation |
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Granted publication date: 20190405 |