CN201687522U - Coal bed gas radio frequency spectrum direction finding early warning system - Google Patents

Coal bed gas radio frequency spectrum direction finding early warning system Download PDF

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Publication number
CN201687522U
CN201687522U CN2010201053412U CN201020105341U CN201687522U CN 201687522 U CN201687522 U CN 201687522U CN 2010201053412 U CN2010201053412 U CN 2010201053412U CN 201020105341 U CN201020105341 U CN 201020105341U CN 201687522 U CN201687522 U CN 201687522U
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input
output
amplifier
received
signal
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黄福泉
袁亮
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National Engineering Research Center For Coal Gas Control
Huainan Mining Group Co Ltd
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National Engineering Research Center For Coal Gas Control
Huainan Mining Group Co Ltd
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Abstract

A coal bed gas radio frequency spectrum direction-finding early warning system receives gas radio steady-state and unsteady-state radiation temperature signals of a gas enrichment area in a coal rock layer through a radio astronomical modulation radiation receiving device so as to indirectly measure the gas pressure of the coal bed; receiving a gas radio unsteady state and rapid change radiation intensity and form signal of a gas enrichment region in a coal rock layer through a radio astronomy full-power radiation receiving device so as to judge the type and the change rate of the measured gas radio radiation; the method comprises the steps of receiving a gas radio unsteady state and fast-change radiation spectrum peak value and frequency drift of a gas enrichment region in a coal rock layer through a radio astronomical spectrum radiation receiving device, and thus early warning of coal tile outburst. The azimuth and normal distance of the gas enrichment area are determined by matching the maximum values of the three signals under different antenna azimuth and elevation angles and by triangulation.

Description

Coal bed gas radio spectrum direction-finding early warning system
Technical field
The utility model relates to measures the coal rock layer gas pressure in the digging of colliery, a kind of application radio astronomy of more specifically saying so is modulated, total power, frequency spectrum and absolute calibration method, more accurately measure the radiation temperature in gas radio radiation source in the coal rock layer, relative Strong degree, frequency spectrum and orientation and length of normal, setting up Mathematical Modeling and data by actual measurement again handles and obtains the radiant flux that coal seam unit length attenuation factor calculates gas source itself, and then the pressure in match-drill actual measurement gas source, draw the pressure dependence of radiant flux and gas source under a certain geology and the coal seam conditions, nationality is with the gas pressure of measuring gas enrichment region in the coal rock layer and the coal bed gas radio spectrum direction-finding early warning system of early warning coal watt outburst danger.
Background technology
Coal is watt projecting coal bed, and an especially serious coal watt projecting coal bed safe tunneling construction is still global problem so far.Equally, the mensuration of orientation, pressure and the outburst danger of coal watt projecting coal bed inner gas pressure concentrated area and forecast also are global problem so far.Past is methods such as used bore detecting, rock noise detection, microseism detection, electromagnetic surveying in the colliery, and former three all is that contact is surveyed in these methods, or make gas pressure be difficult to The real time measure because of position, hole, hole depth are difficult to measure; Or because of inadequately sensitive, be subject to noise and disturb, be difficult to set up and the gas pressure model; Or be difficult to greatly in the digging The field because of equipment Pang; Survey though the latter is noncontact, the single channel test that is based upon on the step-by-step counting basis is difficult to distinguish with impulse disturbances, thereby the false alarm rate height, and is non-linear detection, is difficult to set up the gas pressure model; Therefore prior art all can not the inner gas pressure in fine solution coal seam, the mensuration and the coal watt outstanding early warning in orientation.Though each colliery has all been set up tunnel gas in succession and has been detected monitoring system, but can only detect the concentration of the gas that from coal rock layer, had infiltrated already in the air of tunnel, and can not detect the gas bearing capacity that tunnels in the exploitation coal seam, work plane the place ahead, thereby can not solve fundamentally that coal and gas are outstanding to cause gas density moment to increase, the prediction of the gas explosion that causes and prevent and treat problem.In general, the present coal-bed gas method of testing of using in the digging of colliery, it all is non-linear, single channel, single physical quantity hardware measureing equipment in essence.
Summary of the invention
The utility model purpose is for overcoming above-mentioned existing in prior technology weak point, utilization very ripe radio astronomy in radio astronomy is modulated, total power, frequency spectrograph, interfere, methods such as polarization (polarization) and absolute calibration, a kind of coal bed gas radio spectrum direction-finding early warning system is provided, it is the coal bed gas radio spectrum direction-finding early warning system of the many sensing units of a kind of linear multichannel, can measure the radiation temperature in gas radio radiation source in the coal rock layer simultaneously, relative Strong degree, transmitted spectrum and radiation source orientation and polarization, nationality is to measure the gas pressure of gas enrichment region in the coal rock layer, orientation and early warning are outstanding.
The basic principle clear in order to narrate, that first brief introduction coal-bed gas radio is surveyed:
1, there is the Boltzmann radiation in the coal-bed gas under the non-absolute zero: P=ε KT, ε are coal-bed gas absorption coefficient (ε≤1), and T is an absolute temperature, and K is a Boltzmann constant.Because the impossible transition of the physical temperature of depths, stratum is so this is the background radiation in other words of a kind of gradual steady state of radiation;
2, there is the electromagnetic radiation that adsorption gas expands and causes coal rock layer to rupture and produce in the coal-bed gas enrichment region, because the complexity of geodynamics and the randomness of fracture, this is a kind of unstable state radiation of spike form;
3, earth capacitance device (containing the gas pressure increase causes) polar plate spacing L and the charge Q variation generation long wave radio radiation (λ ∝ L, p ∝ Δ Q) in geodynamics changes that constitutes by the alternate superposition in multilayer large tracts of land weakly conducting coal seam in the mining area and insulation rock stratum;
4, a large amount of electric charges of the long and medium wave radiation that produces because of the adsorption gas volumetric pressure changes of the coal-bed gas enrichment region adsorption gas electric capacity that exists the gas liquid gas-bearing formation of local weakly conducting coal seam and insulation to constitute and gas enrichment region inner accumulated are most advanced and sophisticated by the radiation of the local anaerobic discharge generation of methane gas De Jian Mine through the coal seam;
5, the coal-bed gas δ radio spectral line radiation (in complex geological tectonic, be not precluded within and form high Q resonant cavity in the complex geological tectonic, just be enough to form frequency) that excites of the earth high Q resonant cavity from the δ of 1KHZ-100KHZ line emission; And the spectrum peak drift and the high pressure gas gas molecule characteristic spectral line radiation that may exist or the like.
Our target is exactly to improve by the mature technology in the comprehensive utilization Radio Astronomical Methods and in conjunction with the actual conditions in the coal mining, with a kind of comprehensive, multichannel, high performance coal bed gas radio spectrum direction-finding system realizes the reception to above-mentioned five kinds of coal-bed gas radio radiation signals, measure and write down its radiation temperature, relative intensity, the drift of transmitted spectrum Pu Mine, radiation area orientation and length of normal, radiation polarizations etc. are with antenna bearingt, the elevation angle, the variation of time and form thereof, nationality is with the indirect determination coal-bed gas pressure, determine its position, radiation form and emission types thereof are produced thereby instruct, early warning coal and gas are outstanding.
The coal bed gas radio spectrum direction-finding system is different from general radio receiver, owing to receive special objects, it has several fundamental technicss to require: 1. high gain stability: black body radiation is a kind of radiation of white noise form, there is no different with the electronic noise of receiving system in itself, therefore, if the receiving system gain is unstable, then when receiving system output changes, we can't distinguish the variation of the gas radio radiation signal that receiving system receives or the variation of receiving system own ship's noise at all.So, in general, require receiving system complete machine gain stability reach at least ± 1～2%/per hour or higher; 2. high sensitivity: the ideal sensitivity Δ T=aT sys/ √ Δ f て of radio radiation machine, make ideal sensitivity Δ T good more, necessary: as to reduce system noise temperature Tsys, increase the equivalent bandwidth Δ f of system, increase the て time of integration of system, in general, require the receiving system machine sensitivity to reach 1～2 ° of K or lower at least; 3. high anti-interference: relevant treatment, the back lobe that suppresses fixed interference frequently, tight TACT-CONSTRUCTION-RATES shielding and filtering, reduction antenna and sidelobe level, multi-octave BREATHABLE BANDWIDTH, multichannel comparison or the like; 4. high linearity and great dynamic range: as 〉=60db dynamic range, dynamic range internal linear ≯ 2～10%, programme-controlled gain, software and radio technique or the like.
Eventually the above, the present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of coal bed gas radio spectrum direction-finding early warning system, it is characterized in that the chopped radiation counter device in this system synthesis application Radio Astronomical Methods, the total power radiometer device, heterodyne frequency spectrograph device, coal-bed gas pressure measurement mechanism in absolute calibration device and the coal mine geology, the radiation temperature in the gas radio radiation source in the mensuration coal rock layer under the different antennae orientation and the elevation angle, relative Strong degree, transmitted spectrum and radiation source orientation and polarization, nationality is to measure the orientation of gas enrichment region in the coal rock layer, gas pressure size and variation thereof, early warning coal watt outburst danger; Be provided with and comprise:
Radio astronomy chopped radiation receiving system receives gas enrichment region gas radio stable state and unstable state radiation temperature signal in the coal rock layer by it, and nationality is to measure coal-bed gas pressure;
Radio astronomy total power radiation receiving system receives the radio unstable state of gas enrichment region gas and fast-changing radiation Strong degree and form signals in the coal rock layer by it, and nationality is to differentiate gas radio radiation type and the rate of change surveyed;
Radio astronomy spectrum radiation receiving system, by its receive the radio unstable state of gas enrichment region gas and fast-changing spoke radio-frequency spectrum Mine value in coal rock layer and to front end drift, nationality is watt outstanding with the early warning coal;
Long and medium wave directional aerial group, the signal of above-mentioned three kinds of receptions is passed through the rotation and the displacement of both sides tropism's antenna by it, acquisition is peaked coincideing under the different antennae orientation and the elevation angle, again through trigonometric calculations, measure polarization, orientation, the elevation angle and the length of normal of gas enrichment region, to determine the distance of gas enrichment region to antenna;
By the coal-bed gas pressure measurement mechanism in radio astronomy absolute calibration and the coal mine geology, the output signal that shows is converted to the gas enrichment region aerial radiation temperature that antenna is received, after the gas pressure of the radio wave loss coefficient of knowing the unit length coal seam and coal-bed gas enrichment region, be gas pressure with the aerial radiation temperature transition again, just can show and read gas pressure from instrument.
Modulation system coal-bed gas radio radiation receiving system, active bandstop filter, broadband buffer amplifier, the adjustable gain master video amplifier, low temperature float two differential pair tube multiplication of voltage wave detectors, video dc amplifier, synchronous integrator, synchronous phase detector, active integrator, phase-locked sync generator, multichannel cmos buffer device and overshoot excision control signal delay circuit frequently to contain broadband beam antenna interface, three port video modulators, low noise video preamplifier, multi-octave BREATHABLE BANDWIDTH amplifier, optional film isolation attenuator, three; Enter the signal input port of three port video modulators through the broad-band antenna interface by the next aerial signal of broadband beam antenna, another input port of three port video modulators connects 50 Ω terminate loads, the driving square wave input of three port video modulators is received wherein one road delivery outlet of multichannel cmos buffer device 7 road synchronous square-wave signals output, aerial signal after the square wave modulation is received the input of low noise video preamplifier by the signal output port of three port video modulators, the output of low noise video preamplifier is received the signal input part of multi-octave BREATHABLE BANDWIDTH amplifier, the program control signal input of multi-octave BREATHABLE BANDWIDTH amplifier receive embedded type CPU 3 road D/A output one of modulation bandwidth programme-control voltage output, the signal output part of BREATHABLE BANDWIDTH amplifier is received the input that optional film is isolated attenuator.Optional film is isolated the input that the attenuator output is received the active bandstop filter of three frequencies, and the output of the active bandstop filter of three frequencies is received the input of broadband buffer amplifier.The output of broadband buffer amplifier is received the signal input part of the adjustable gain master video amplifier, the driving square wave input of the overshoot cut-off circuit of the adjustable gain master video amplifier is received the output of overshoot excision control signal delay circuit, the adjustable gain program control signal input of the adjustable gain master video amplifier receive embedded type CPU 3 road D/A output one of modulation gain programme-control voltage output, the output of the adjustable gain master video amplifier is received the input that low temperature floats two differential pair tube multiplication of voltage wave detectors.The output that low temperature floats two differential pair tube multiplication of voltage wave detectors is received the input of video dc amplifier, the output of video dc amplifier is received the signal input part of synchronous integrator, the two-phase of synchronous integrator drives the delivery outlet that the square wave input is received the wherein two-way of multichannel cmos buffer device, the signal output part of synchronous integrator is received the synchronous phase detector signal input part, the two-phase of synchronous phase detector drives the delivery outlet that the square wave input is received the wherein two-way of multichannel cmos buffer device 7 road synchronous square-wave signals output, the signal output part of synchronous phase detector, receive the input of active integrator, direct current signal through a representative antennas input signal Strong degree of output behind the active integrator integration, the output of active integrator is received first A/D input port of embedded type CPU, it is the modulation-demodulation signal input port, all modulated square wave signals produce by phase-locked sync generator, the square wave output of phase-locked sync generator is received the input of multichannel cmos buffer device, the reference signal input of phase-locked sync generator is received the phase-locked reference signal delivery outlet of embedded type CPU, multichannel cmos buffer device has the output of 7 road CMOS level synchronization square-wave signals, wherein 2 tunnel two-phases of receiving synchronous integrator drive the square wave input, 2 tunnel two-phases of receiving synchronous phase detector drive the square wave input, 2 tunnel two-phases of receiving synchronous integrator drive the square wave input in addition, also have 2 tunnel two-phases of receiving overshoot cut-off circuit control signal delay circuit to drive the square wave input, last 1 the tunnel receives the driving square wave input of three port video modulators;
Total power formula coal-bed gas radio radiation receiving system contains many segmented antenna interface, wideband video switching regulator mechanical tuning circuit, outer single-chip microcomputer front end Frequency Selection Controller synchronously, low noise video preamplifier, multi-octave BREATHABLE BANDWIDTH amplifier, optional film and isolates attenuator, four active bandstop filter, broadband buffer amplifier, the program-controlled main video amplifier of AGC, low temperature float two differential pair tube multiplication of voltage wave detectors, video dc amplifier and active integrator frequently; The multichannel aerial signal that is come by many segmented ferrites antenna enters wideband video switching regulator mechanical tuning circuit through many segmented antenna interface, the signal output part of this wideband video switching regulator mechanical tuning circuit is delivered to the aerial signal of a certain frequency of selecting the input of low noise video preamplifier, wideband video switching regulator mechanical tuning circuit is by the control of outer single-chip microcomputer front end Frequency Selection Controller synchronously, the outer external synchronization signal input of single-chip microcomputer front end Frequency Selection Controller is synchronously received the single-chip microcomputer external synchronization signal delivery outlet of embedded type CPU, the output of low noise video preamplifier is received multi-octave BREATHABLE BANDWIDTH amplifier input terminal, the optional film of the output of multi-octave BREATHABLE BANDWIDTH amplifier is isolated the input of attenuator, the output of optional film isolation attenuator is received the input of four frequency source bandstop filters, and the output of the active bandstop filter of four frequencies is received the input of broadband buffer amplifier.The output of broadband buffer amplifier is received the signal input part of the program-controlled main video amplifier of AGC, the signal output part of the program-controlled main video amplifier of AGC is received the input that low temperature floats two differential pair tube multiplication of voltage wave detectors, the program control signal input of the program-controlled main video amplifier of AGC receive embedded type CPU 3 road D/A output one of total power gain procedure control voltage output end, the output that low temperature floats two differential pair tube multiplication of voltage wave detectors is received the input of video dc amplifier, the output of video dc amplifier is received the input of active integrator, the direct current signal of a representative antennas input signal Strong degree of output behind the active integrator integration, the output of active integrator is received second A/D input of embedded type CPU, i.e. total power restituted signal input port;
High intermediate frequency heterodyne sweep-frequency B coal-bed gas radio radiation frequency spectrum receiving system contains the broadband beam antenna interface, the low noise video preamplifier, low pass filter, the broadband buffer amplifier, optional film is isolated attenuator, the dual frequency active bandstop filter, the multi-octave frequency mixer, preposition high intermediate frequency amplifier, high if bandpas filter, high intermediate frequency quartz-crystal filter, the high intermediate frequency amplifier of back level, high intermediate frequency buffer amplifier, low temperature floats two differential pair tube multiplication of voltage wave detectors, the video dc amplifier, integrator, program-controlled DDS Direct Digital is synthesized the local oscillation signal generator, high-pass filter and local oscillator buffer amplifier; By the aerial signal that broadband beam antenna comes, receive the input of low noise video preamplifier through the broadband beam antenna interface.The output of low noise video preamplifier is received the input of low pass filter, the output of low pass filter is received the input of broadband buffer amplifier, the output termination film of broadband buffer amplifier is isolated the input of attenuator, the output of film isolation attenuator is received the input of dual frequency active bandstop filter, the output of active bandstop filter is received the signal input part of multi-octave broadband mixer, inserts high Q intermediate frequency LC ripple device at the signal input part of multi-octave broadband mixer; The local oscillator input of multi-octave broadband mixer is received the output of local oscillator buffer amplifier, high intermediate frequency signal output part after the frequency conversion of multi-octave broadband mixer is received the input of preposition high intermediate frequency amplifier, the output of preposition high intermediate frequency amplifier is received the input of the high if bandpas filter of lumped parameter, the output of high if bandpas filter is received the input of high intermediate frequency quartz-crystal filter, the output of quartz-crystal filter is received the input of rearmounted high intermediate frequency amplifier, and the output of rearmounted high intermediate frequency amplifier is received the input of big dynamic high intermediate frequency buffer amplifier.The output of high intermediate frequency buffer amplifier is received the input that low temperature floats two differential pair tube multiplication of voltage wave detectors, the output that low temperature floats two differential pair tube multiplication of voltage wave detectors is received the input of video dc amplifier, obtain the direct current signal of a representative antennas input spectrum Strong degree behind the output process integrator integration noise suppression of video dc amplifier, deliver to the 3rd A/D input of embedded type CPU, it is frequency spectrum restituted signal input port, the frequency sweep local oscillator of frequency spectrograph is produced by program-controlled DDS Direct Digital synthesized signal generator, the external trigger synchronous signal input end of program-controlled DDS Direct Digital synthesized signal generator is received the local oscillator external trigger synchronizing signal delivery outlet of embedded type CPU, the local oscillator output of program-controlled DDS Direct Digital synthesized signal generator is received the input that the 10db film is isolated attenuator, the output of film isolation attenuator is received the input of low pass filter, the output of low pass filter is isolated the input that attenuator is received high-pass filter through the 3db film, the output of high-pass filter is received the input of local oscillator buffer amplifier, and the output of local oscillator buffer amplifier is received the local oscillator input of multi-octave broadband mixer;
System also is provided with
Clamp-on goes into formula CPU center control data processes and displays device: veneer CPU, 512MDDR internal memory and the 8G CF card memory, the 12bit 100KHz16 that contain operation WIN XP operating system select 1 A/D converter, 3 road 12bit 33KHzD/A converters, LCD display and corresponding A/D, D/A change-over panel and corresponding I/O interface;
Explosion-proof rechargeable Ni-H 2 battery group and voltage-stabilized power supply: comprise+15V ,+8V ,+8V ,-8V, 4 groups of rechargeable Ni-H 2 battery groups and corresponding 4 groups of constant pressure and flow Ni-MH battery chargers and+12V ,+5V ,+5V ,-5V, 4 tunnel voltage-stabilized power supplies and corresponding EMI protection, filtering, decoupling, overheated, overcurrent, short-circuit protection circuit;
Said double antenna system is loaded by the inductance that is installed together that the high ε medium of low-loss is sealed the accurate logarithm period plate aerial in broadband and Single-chip Controlling can the many segmented antenna of the extraordinarily long ferrite of the section of satisfying switch dual be formed amphiorentation reception antenna group jointly, both are high-end frequency acceptance band, middle-end, low and middle-end all has directionality, utilize the high ε medium of inductance loading low-loss in the amphiorentation antenna to seal the accurate logarithm period plate aerial in broadband in the antenna main lobe directionality of medium wave and middle long wave and 8 font directionality of double many segmentations of lengthening ferrite broad-band antenna, be as the criterion with the antenna plane normal, each choosing a bit on the preceding both sides of face, rotary antenna is found out line De Long degree between the angle of line between the antenna plane of coal-bed gas radio radiation peak response value and and at 2 at 2 separately, the orientation that can obtain coal-bed gas radio radiation source reaches the length of normal of line between 2 o'clock, thereby can determine the distance of gas radio radiation source to antenna.
Said radio astronomy absolute calibration device adopts Cooling and Heat Source calibration and the calibration of antenna actinal surface, modulation system coal-bed gas radio radiation receiving system is received end face Cooling and Heat Source absolute calibration and antenna actinal surface Cooling and Heat Source absolute calibration and standard antenna comparison, to measure the coal-bed gas radio radiation temperature that antenna is received, determine the distance of gas radio radiation source by 2 direction findings again to antenna and gas radio radiation, obtain coal seam unit length attenuation factor through actual measurement, calculate the radiant flux in gas source itself, and then the coal-bed gas pressure measuring method in the cooperation coal mine geology promptly seals the pressure in boring actual measurement gas source, obtain the pressure dependence of radiant flux and gas source under a certain geology and the coal seam conditions, show the direct-reading gas pressure from instrument.
Said modulation system coal-bed gas radio radiation receiving system, total power formula coal-bed gas radio radiation receiving system and high intermediate frequency heterodyne sweep-frequency B coal-bed gas radio radiation frequency spectrum receiving system are contained in same flame proof iron and close the interior common signal that receives from same radiation source of triple channel that constitutes, the reception system that they are different, gain, bandwidth, the time of integration and display mode, handle to realize suppressing effectively to disturb and observation useful signal form and parameter and adopt high intermediate frequency heterodyne sweep-frequency B frequency spectrograph to receive and analyze to show coal-bed gas radio radiation frequency spectrum through embedded type CPU, and monitor it and compose the Mine value frequently to high-end the moving with as early warning coal watt outstanding important evidence of frequency.
Advantage of the present invention and remarkable result:
1, the linear reception: the output and the aerial signal of this machine are linear, and its linear dynamic range reaches 30-40db, can reach 70db through agc circuit, re-use calibration curve as calculated machine maintenance just can reach 80-90db.This just can export the reading demarcation with instrument by absolute calibration and be radiant flux, demarcates by gas its demarcation is contained gas amount for gas pressure, concentration or a ton coal again.Adopt step-by-step counting mostly and measure the gas electromagnetic radiation in the past both at home and abroad, be difficult to set up the linear relationship of instrument output and gas radio radiation Strong degree, also just instrument can not be exported reading and demarcate and to be gas radio radiation Strong degree, the more impossible demarcation by absolute calibration and gas exported reading with instrument and demarcated to gas pressure, concentration or a ton coal and contain gas amount.
2, frequency spectrum receives: adopt high intermediate frequency heterodyne sweep-frequency B frequency spectrograph to receive and show coal-bed gas radio radiation frequency spectrum, show the coal-bed gas radio radiation frequency spectrum in the frequency range of 5～1300KHz with the spectral resolution of 1-5KHz, and monitor its Pin Pu Mine value to high-end the moving with as early warning coal watt outstanding important evidence of frequency.And by to the unit interval counting of the frequency below 100KHz spectrum Mine as an index weighing coal-bed gas activity severe degree, and the maximum value of the spectral peak during a certain antenna azimuth participates in the metering of coal-bed gas radio radiation as the parameter of six parameter polar diagrams.Look into newly through science and technology, still do not have similar techniques both at home and abroad.
3, the amphiorentation antenna receives: by being installed in the common radio radiation that receives from coal-bed gas of conplane amphiorentation antenna, for wearing the high ε medium of low-loss, inductance seals broadband logarithm period plate aerial for one, another can the section of satisfying switch the tuning many segmented antenna of double lengthening ferrite for Single-chip Controlling, both have different antenna direction characteristics, both receive the direction finding, differentiation useful signal, the inhibition that help coal-bed gas radio radiation source together and disturb, and reduce false-alarm.And can utilize the flat plane antenna polarization characteristic different to distinguish the polarization in coal-bed gas radio radiation source and then segment its end face situation of meeting head on (end face to development end or side to development end etc.) with ferrite antenna.
4, the multichannel multisensor receives: close interior modulation receiving instrument by being contained in same flame proof iron, total power receiving instrument and frequency spectrum receiving instrument are by the common signal that receives from same coal seam gas radio radiation source of double antenna, because of (the modulation of its different reception system, total power, frequency spectrum), gain (linearity, AGC, point is almost frequently), bandwidth (broadband, narrow-band, the 1-5KHz point frequently), the time of integration (2S, 0.5S, 10mS) and display mode (digital display, digital display, simulation), in fact being equivalent to the multichannel multisensor receives, handle through embedded type CPU, overlap criterion by threshold values and can reduce false-alarm widely, also can more effectively suppress to disturb and more effectively observe useful signal form and parameter simultaneously.This is not do in both at home and abroad the coal-bed gas radio radiation being surveyed to be.
5,15 ° of direction findings: utilize inductance in the amphiorentation antenna to wear the high ε medium of low-loss and seal the accurate logarithm period plate aerial in broadband in the antenna main lobe directionality of medium wave and middle long wave and 8 font directionality of the many segmented antenna of double lengthening ferrite, be as the criterion with the antenna plane normal, each choosing a bit on the preceding both sides of face, rotary antenna is measured line De Long degree between the angle of line between the antenna plane of coal-bed gas radio radiation peak response value and and at 2 at 2 separately, can obtain the orientation in coal-bed gas radio radiation source and the length of normal of line between 2 o'clock.Its direction finding precision can reach 15 °, and this index far surpasses reported in literature.
6, gas bearing capacity in the gas pressure of the modulation system radio radiation receiving equipment of application high-gain stability and the calibration of receiver Cooling and Heat Source and antenna actinal surface calibration technology mensuration coal-bed gas radio flux and then demarcation coal-bed gas enrichment region or the unit volume coal seam: using gain stability reaches ± the linear receiving equipment of 0.5%/modulation system radio radiation hourly, can measure the coal-bed gas radio radiation temperature that antenna is received exactly by calibration of receiver Cooling and Heat Source and antenna actinal surface calibration technology, obtain the distance in antenna and source again by direction finding, actual measurement obtains the radiant flux that coal seam unit length attenuation factor can calculate gas source itself, and then match-drill actual measurement obtains the pressure of coal-bed gas enrichment region, can draw the pressure dependence of radiant flux and coal-bed gas enrichment region under a certain geology and the coal seam conditions.This also is not report in the domestic and foreign literature.
7, using the time of integration short total power formula coal-bed gas radio radiation receiving equipment can receive and the form of definite coal-bed gas radio radiation: be short to 0.01S～O.1S the time of integration when adopting, and when using the total power formula coal-bed gas radio radiation receiving equipment of ferrite antenna, we can receive the waveform and the form of coal-bed gas radio radiation, and can distinguish the different radiative process of steady state of radiation, unstable state radiation, spike radiation or the like of coal-bed gas radio radiation thus.We can judge on the radiation form when the spike radiation accounts for that main form Qie Mine value is higher to increase Strong especially suddenly like this, and majority is representing that the coal seam adsorption gas is movable violent, the just increase of possibility that coal and gas are outstanding.
8, Gao Neng Clamp-on goes into AMD 32 bit CPUs, 512MB internal memory, 8G CF card memory, 12bitA/D and the D/A of the application of formula CPU: 500MHz, realized the programme-control of complete machine, accurately and apace data processing, numeral and figure show, and have realized the real time record and the storage of the whole test datas in the activity duration.More high performance computer workstation easy to use carries out subsequent treatment and data readback, and this is for stockpile, and the thing of further seeking the regularity between geology, coal seam, gas and the digging has very high value.
More than comprehensive, the utlity model has the application that high-gain stability Qie You Clamp-on goes into the programme controlled linear modulation receiving equipment of formula CPU, can measure the coal-bed gas radio radiation comparatively accurately; Receive in the time of double antenna, triple channel, AWC, AGC, PGC, synchronous integration, relevant treatment, the different time of integration and can differentiate interference effectively, reduce false alarm rate; Broader frequency spectrum is measured, and the observation and the early warning of coal watt outstanding omen intuitively are provided; The measurement of extraordinary directive antenna two point has realized coal-bed gas enrichment region azimuth, length of normal and position measurement, for setting up gas radio radiation temperature and the gas pressure relation provides new means.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is a modulation system coal-bed gas radio radiation receiving system theory diagram;
Fig. 3 is a total power formula coal-bed gas radio radiation receiving system theory diagram;
Fig. 4 is high intermediate frequency heterodyne sweep-frequency B coal-bed gas radio radiation frequency spectrum receiving system theory diagram;
Figure 5 Shi Clamp-on go into formula CPU center control data processes and displays device hardware principle block diagram;
Figure 6 Shi Clamp-on go into formula CPU center control data processes and displays device software main program block diagram;
Fig. 7 is explosion-proof type rechargeable Ni-H 2 battery group and 4 tunnel accurate voltage-stabilized power supply block diagrams;
Fig. 8 is a coal-bed gas radio radiation receiving equipment long and medium wave amphiorentation antenna sets block diagram;
Fig. 9 is a coal-bed gas radio radiation receiving equipment software LO configuration module block diagram;
Figure 10 is a coal-bed gas radio radiation receiving equipment software systems initialization module block diagram;
Figure 11 is a coal-bed gas radio radiation receiving equipment software systems status control module block diagram;
Figure 12 is that coal-bed gas radio radiation receiving equipment software A/D initialization is provided with block diagram;
Figure 13 is that coal-bed gas radio radiation receiving equipment software D/A initialization is provided with block diagram;
Figure 14 is a coal-bed gas radio radiation receiving equipment software interrupt subroutine module block diagram.
The specific embodiment
Referring to Fig. 1, the utility model comprises totally 6 kinds of concrete equipment, it is respectively modulation system coal-bed gas radio radiation receiving system, total power formula coal-bed gas radio radiation receiving system, high intermediate frequency heterodyne sweep-frequency B coal-bed gas radio radiation frequency spectrum receiving system; Clamp-on goes into formula CPU center control data processes and displays device, explosion-proof rechargeable Ni-H 2 battery group and voltage-stabilized power supply and long and medium wave directional aerial group, except that antenna all separately to place altogether in the flameproof enclosure that has withstand voltage transparency display window mouth after the airtight shielding of silver-plated shell, antenna is then introduced flameproof enclosure with the flame-proof explosion-proof cable by the flame proof joint, to adapt to the colliery underground work.The 1st, external plate aerial; The 2nd, external magnetic antenna; The 3rd, modulation system radio radiation receiving system; The 4th, total power formula radio radiation receiving system; The 5th, heterodyne system frequency spectrograph receiving system; The 6th, heterodyne system frequency spectrograph DDS local oscillation device; The 7th, Clamp-on goes into formula CPU center control data processes and displays device; The 8th, Clamp-on go into formula CPU 6.4 " the color LCD display unit; 9 is 4 tunnel accurate voltage-stabilized power supplies; The 10th, built-in explosion-proof type rechargeable Ni-H 2 battery group; The 11st, external 4 tunnel level pressure constant current chargers; The 12nd, keyboard and mouse interface; The 13rd, the flame proof outer steel shell.
See Fig. 2, modulation system coal-bed gas radio radiation receiving system contains 50 Ω SMA sockets of the connection plate aerial output cable that is contained on the screening can, and this coaxial socket is received the aerial signal input port of low Insertion Loss three port video modulators through semi-rigid cable; Another signal input port of low Insertion Loss three port video modulators is received 50 Ω SMA sockets on the screening can through semi-rigid cable, the external 50 Ω SMA precision loads of this socket, the signal output port of low Insertion Loss three port video modulators is received low noise junction field effect differential pair tube (2N6484) differential input end of low noise video preamplifier through semi-rigid cable; The low noise video preamplifier is made up of the high cmrr instrumentation amplifier circuit that two-stage low noise junction field effect difference cascode is total to collector and two-stage low noise double operational (EL2227) formation, and the instrumentation amplifier output is received multi-octave BREATHABLE BANDWIDTH amplifier input terminal through semi-rigid cable; Multi-octave BREATHABLE BANDWIDTH amplifier is made of broadband operational amplifier integrator, controllable gain amplifier (VCA810) and unit gain buffer stage, can change bandwidth by adding control voltage or programme-control voltage, its buffering output is received the input that optional book film is isolated attenuator through semi-rigid cable; Optional book film is isolated attenuator and is made of book film circuit, and its decay can be adjusted between 10～30db, and its output is received the input of the active bandstop filter of three frequencies through semi-rigid cable; The active bandstop filter of three frequencies constitutes 3 grades of active second order bandstop filters by six double operationals (EL2227), decides frequency interference signal and passes through with inhibition 10KHz, 15KHz, 100KHz, and its output is received the input of broadband buffer amplifier through semi-rigid cable; The broadband buffer amplifier is made of 2～3 grades of broadband operational amplifiers (OPA846), and its output is received the input of the adjustable gain master video amplifier through semi-rigid cable; The signal that is input to the adjustable gain master video amplifier is earlier through sending into the modulated square wave overshoot cut-off circuit that is made of two-way cmos analog switch (43113) after the buffering, the control end of two-way cmos analog switch is received the output of overshoot excision control signal delay circuit through semi-rigid cable, the program-controlled great dynamic range main amplifier of the output termination of analog switch (VCA810), main amplifier are received the input that low temperature floats two differential pair tube multiplication of voltage wave detectors with semi-rigid cable behind unity gain buffer; Low temperature floats two differential pair tube multiplication of voltage wave detectors are made of the band temperature-compensating the two differential pair tubes (2FC2C) of the hyperfrequency that all connects into the cb-e knot multiplication of voltage wave detector, but after connect zeroising dc amplifier (OPA27), its output is received the input of synchronous integrator through semi-rigid cable; Synchronous integrator is a kind of switch capacitance integrator circuit of being made up of amplifier (OPA27), analog switch and electric capacity, its on-off circuit is that two two-way cmos analog switches (43113) constitute, two control ends of analog switch are received a pair of homophase and the reversed-phase output of multichannel cmos buffer device respectively, and the signal output of synchronous integrator is received the signal of synchronous phase detector and imported auspicious; Synchronous phase detector is by also being made up of two two-way cmos analog switches (43112,43113) and difference amplifier, two control ends of analog switch are received the other a pair of homophase and the reversed-phase output of multichannel cmos buffer device respectively, and the signal output part of synchronous phase detector is received the input of active integrator; Active integrator is that the integrating circuit of 2S constitutes by amplifier and time constant, the output of the Low ESR of active integrator is the output of whole modulation system coal-bed gas radio radiation receiving system, goes into the SMA input adapter of the modulation A/D of formula CPU center control data processes and displays device Dao Clamp-on through semi-rigid cable and sub-miniature A connector Jie; The modulated square wave signal generator is gone into outer synchronous phaselocked loop (CD4046) sync generator of synchronizing signal of formula CPU center control data processes and displays device output by Ke Jie Shou Clamp-on, multichannel cmos buffer device (CD4069), and formation such as modulated square wave overshoot excision control signal delay circuit, be specifically designed to and produce 1 tunnel single-phase 12.5Hz modulated square wave (for three end modulators), 1 tunnel two-phase 12.5Hz square wave (for synchronous integrator), in addition 1 tunnel two-phase 12.5Hz square wave (for synchronous phase detector) and the 3 tunnel two-phase 12.5Hz square wave (for overshoot excision control signal delay circuit); Among the figure, the 1st, modulation system radio radiation receiving system plate aerial interface; 2 is 50 Ω terminate load interfaces of three port video modulators; The 3rd, 50 Ω terminate load interfaces of the adjustable gain master video amplifier; The 4th, the control voltage interface of the adjustable gain master video amplifier; The 5th, the control voltage interface of multi-octave BREATHABLE BANDWIDTH amplifier; The 6th, the external synchronization signal interface of phase-locked synchronous generator; The 7th, modulation system radio radiation receiving system demodulation output interface; The 8th, the power supply input and the filtering interface of modulation system radio radiation receiving system.
See Fig. 3, the 50 Ω SMA sockets that total power formula coal-bed gas radio radiation receiving system contains the connection antenna output cable that is contained on the screening can connect 16 interfaces of many segmented ferrites antenna, one of 16 coaxial dry reed switch who connects wideband video switching regulator mechanical tuning circuit through 16 coaxial cables respectively, 4 one the coaxial dry reed switch all in parallel in back all in parallel, the other end of 16 coaxial dry reed switch and other links to each other, the other end of these 4 coaxial dry reed switch connects respectively with the tuning electric capacity of the low-loss of different capabilities, 20 coaxial dry reed switch overcoats are with electromagnetic coil altogether, whether its conducting is the basic conducting control module of electromagnetic coil by 20 relay inductive load drive integrated circults (MDC3105), the outer output of single-chip microcomputer front end Frequency Selection Controller is synchronously received in this integrated circuit (MDC3105) control input end, outer single-chip microcomputer front end Frequency Selection Controller synchronously is made of CMOS single-chip microcomputer (AT89C2051) and 2 high-speed cmos shift registers (74HC595), Ke Jie Shou Clamp-on goes into the external synchronization signal of formula CPU center control data processes and displays device and controls, also can produce the conducting control signal of 16+4=20 road MDC3105 altogether voluntarily, can constitute 16 * 4=64 or a 16 * 1=16 resonant tank; Link to each other with winding displacement between outer single-chip microcomputer front end Frequency Selection Controller synchronously and the wideband video switching regulator mechanical tuning circuit.The whole parallel connections of 20 statures of 20 coaxial dry reed switch are received the SMA input socket of the low noise video preamplifier on the screening can after coaxial cable is received SMA socket on the screening can as the tuning output of ferrite antenna frequency-selecting behind semi-rigid cable and sub-miniature A connector; Receive the input of low noise video preamplifier again through semi-rigid cable.The low noise video preamplifier is made up of the high cmrr instrumentation amplifier circuit that two-stage low noise junction field effect difference cascode is total to collector and two-stage low noise double operational (EL2227) formation, and the instrumentation amplifier output is received multi-octave BREATHABLE BANDWIDTH amplifier input terminal through semi-rigid cable; Multi-octave BREATHABLE BANDWIDTH amplifier is made of broadband operational amplifier integrator, controllable gain amplifier (VCA810) and unit gain buffer stage, can change bandwidth by adding control voltage, its output is received the input that optional book film is isolated attenuator through semi-rigid cable; Optional book film is isolated attenuator and is made of the book film integrated circuit, and its decay can be adjusted between 10～30db, and optional book film is isolated the attenuator output is received the active bandstop filter of four frequencies through semi-rigid cable input; The active bandstop filter of four frequencies constitutes 4 grades of active second order bandstop filters by 8 double operationals (EL2227), pass through with inhibition 50Hz, 10KHz, 15KHz, 100KHz interfering signal, the active bandstop filter output of four frequencies is received the input of broadband buffer amplifier through semi-rigid cable; The broadband buffer amplifier is made of 2 grades of broadband operational amplifiers (OPA846), and its output is received the input of the program-controlled main video amplifier of AGC of great dynamic range through semi-rigid cable; The program-controlled main video amplifier of the AGC of great dynamic range is made of little capacitance integral comparator and wave detector, controllable gain amplifier (VCA810) and unit gain buffer stage, little capacitance integral comparator compares the output of controllable gain amplifier (VCA810) and the level difference between the AGC initial control level, insert the gain control end of controllable gain amplifier after detection, the output of the program-controlled main video amplifier of AGC is received the input that low temperature floats two differential pair tube multiplication of voltage wave detectors with semi-rigid cable; Low temperature floats two differential pair tube multiplication of voltage wave detectors and constitutes the multiplication of voltage wave detector of band temperature-compensating by the two differential pair tubes (2FC2C) of the hyperfrequency that all connects into the cb-e knot, but after connect zeroising dc amplifier (OPA27).The output that low temperature floats two differential pair tube multiplication of voltage wave detectors is received the input of active integrator; Active integrator is the integrating circuit formation of 0.5S by amplifier (OPA27) and time constant, the output of its Low ESR is the output of whole total power formula coal-bed gas radio radiation receiving system, goes into the SMA input adapter of the total power A/D of formula CPU center control data processes and displays device Dao Clamp-on through semi-rigid cable and sub-miniature A connector Jie; Among the figure, the 1st, the external ferrimagnetism antenna and the flame proof handling cable of total power formula radio radiation receiving system; The 2nd, synchronizing signal interface outside the single-chip microcomputer Frequency Selection Controller; The 3rd, the control voltage interface of the program-controlled main video amplifier of controlled AGC; The 4th, the control voltage interface of multi-octave BREATHABLE BANDWIDTH amplifier; The 5th, total power formula radio radiation receiving system demodulation output interface; The 6th, the power supply input and the filtering interface of total power formula radio radiation receiving system.
See Fig. 4, high intermediate frequency heterodyne sweep-frequency B coal-bed gas radio radiation frequency spectrum receiving system contains 50 Ω sub-miniature A connectors of the connection plate aerial output cable that is contained on the screening can, and this coaxial fitting is received the input of low noise video preamplifier through semi-rigid cable.The low noise video preamplifier is made up of the high cmrr instrumentation amplifier circuit that two-stage low noise junction field effect difference cascode is total to collector and two-stage low noise double operational (EL2227) formation, and low noise video preamplifier output is received the input of low pass filter through semi-rigid cable; Low pass filter is 5 grades of T type LC lumped parameter low pass filters, and cut-off frequency 1.4MHz, the output of low pass filter receive the input of broadband buffer amplifier through semi-rigid cable; The broadband buffer amplifier is made of 2 grades of broadband operational amplifiers (OPA846), and its output is received the input that optional book film is isolated attenuator through semi-rigid cable; Optional book film is isolated attenuator and is made of the book film integrated circuit, and its decay can be adjusted between 10～30db, and the output of optional book film isolation attenuator is received the input of dual frequency active bandstop filter through semi-rigid cable; The dual frequency active bandstop filter constitutes 2 grades of active second order bandstop filters by 4 double operationals (EL2227), pass through with inhibition 10KHz, 100KHz interfering signal, dual frequency active bandstop filter output is received the input of multi-octave frequency mixer through semi-rigid cable; The multi-octave frequency mixer is formed dual-gate MOS FET G by the high intermediate frequency of 1.7MHz ripple device, dual-gate MOS FET mixer stage and the high intermediate-frequency transformer of 1.7MHz etc. 1Grid connects input signal through coupling capacitance, dual-gate MOS FET G 2Grid is received the SMA local oscillation signal input socket that is contained on the screening can through coupling capacitance, semi-rigid cable, again through receiving the SMA local oscillation signal accessory power outlet of the synthetic high local oscillation signal generator of program-controlled DDS Direct Digital on the screening can behind semi-rigid cable and the sub-miniature A connector; 1.7MHz the input of preposition high intermediate frequency amplifier is received in the output of the low-resistance of high intermediate-frequency transformer.Preposition high intermediate frequency amplifier is made up of broadband operational amplifier (OPA820), and the input of the high if bandpas filter of 1.7MHz is received in its low-resistance output through semi-rigid cable; High if bandpas filter is a 1.7MHzLC lumped parameter bandpass filter, and bandwidth 100KHz, its output receive the input of high intermediate frequency quartz-crystal filter through 3db isolation attenuator and semi-rigid cable; High intermediate frequency quartz-crystal filter is the compound quartz-crystal filter of 1.7MHz, and bandwidth 1-5KHz (can select), the output of high intermediate frequency quartz-crystal filter be the high intermediate frequency amplifier input of level after semi-rigid cable is received; The back high intermediate frequency amplifier of level is made up of middle power transistor and the high intermediate-frequency transformer of 1.7MHz etc., and the back high intermediate frequency amplifier output of level is received high intermediate frequency buffer amplifier input; High intermediate frequency buffer amplifier is the unit gain in-phase amplifier that broadband operational amplifier (OPA820) is formed, and its output is received the input that low temperature floats two differential pair tube multiplication of voltage wave detectors; Low temperature floats two differential pair tube multiplication of voltage wave detectors are made of the band temperature-compensating the two differential pair tubes (2FC2C) of the hyperfrequency that all connects into the cb-e knot multiplication of voltage wave detector, after connect video dc amplifier (OPA27), its Low ESR output is the output of whole high intermediate frequency heterodyne sweep-frequency B coal-bed gas radio radiation frequency spectrum receiving system, through receiving the signal SMA accessory power outlet on the screening can behind the semi-rigid cable; Process semi-rigid cable and sub-miniature A connector Jie go into the SMA input adapter of the frequency spectrograph A/D of formula CPU center control data processes and displays device Dao Clamp-on again.The synthetic high local oscillation signal generator of program-controlled DDS Direct Digital is made up of crystal oscillator, snubber, multistage variable frequency divider, direct digital synthesis circuit and control interface etc., local oscillator frequency sweep frequency range is 1.705～3.0MHz, frequency sweep cycle 1-12S (can select), step frequency 5-25KHz (can select), stepped intervals 0.05-0.2S (can select), frequency sweep frequency range, frequency sweep cycle, step frequency, stepped intervals and local oscillator output level all can go into formula CPU center control data processes and displays device by Clamp-on through the RS232 interface and control and change.The output of the synthetic high local oscillation signal generator of program-controlled DDS Direct Digital is isolated the humorous local oscillation signal SMA accessory power outlet of just receiving on the screening can through semi-rigid cable behind the clutter of crosstalking that involves of attenuator, 3.1MHz low pass filter, 3db book film isolation attenuator, 1.66MHz high-pass filter and the filtering of local oscillator buffer amplifier through the 10db book film that is connected in series successively and is exported as local oscillator.
See that figure 5 ， Clamp-on go into low-power consumption chip L800,512MB DDR internal memory and 4～16G CF card memory, 12bit 100KHz 16 that formula CPU center control data processes and displays device contains the veneer Industrial Personal Computer (IPC) (iEi WAFER-LX-800) of operation WIN XP operating system, TDP＜6W that its CPU is AMD and select 1 A/D converter (PCM-3718H0A/D), 3 road 12bit 33KHz D/A converters (PCM-3712D/A), 6.4 o'clock color LCD display screens and corresponding A/D change-over panel (PCLD-780), D/A change-over panel (ADAM-3909) and corresponding I/O interface; 3 road A/D input altogether, 3 road D/A output, the output of 3 way word sync signals all link to each other through 9 sub-miniature A connectors altogether on the screening can.3 road A/D Shu go into Duan Fen Do links modulation, total power and frequency spectrograph with semi-rigid cable SMA signal output connector; 3 road D/A fail out minute Do and link the program control bandwidth SMA input adapter of modulation instrument, the programme-controlled gain SMA input adapter of modulation instrument, the program control bandwidth SMA input adapter of total power instrument with semi-rigid cable; 3 way word sync signal Shu Chu Fen Do link the outer synchronous SMA input adapter of modulated square wave of modulation instrument, the outer SMA input adapter synchronously of single-chip microcomputer of total power instrument and the outer SMA input adapter synchronously of DDS local oscillator of frequency spectrograph with semi-rigid cable; 232 interfaces of monolithic Industrial Personal Computer (IPC) LX-800 link to each other with 232 interfaces of the DDS local oscillator of frequency spectrograph; The LCD of monolithic Industrial Personal Computer (IPC) LX-800 shows that accessory power outlet links to each other with the control input socket of 6.4 o'clock LCD displays.In addition, still there is the PS2 socket to connect external mouse etc.; The 1st, Clamp-on goes into formula CPU device A/D converter analog input interface; The 2nd, Clamp-on goes into formula CPU device D/A converter analog signal output interface; The 3rd, Clamp-on goes into formula CPU device digital controlled signal output interface; The 4th, Clamp-on goes into formula CPU device RS-232 serial control interface; The 5th, Peripheral Interfaces such as keyboard, mouse, CF card; The 6th, Clamp-on goes into the power supply input and the filtering interface of formula CPU device;
See Fig. 7, voltage-stabilized power supply, comprise+15V ,+8V ,+8V ,-8V, 4 groups of rechargeable Ni-H 2 battery groups and corresponding 4 groups of constant pressure and flow Ni-MH battery chargers and+12V ,+5V ,+5V ,-5V, 4 tunnel accurate voltage-stabilized power supplies and corresponding EMI protection, filtering, decoupling, overtemperature protection, overcurrent protection, short-circuit protection circuit; 4 groups of rechargeable Ni-H 2 battery groups are formed by the 1.2V10Ah unit, place the shielding of independent galvanized sheet iron to draw (floating ground) by 5 Φ 64700PF feedthrough capacitors in closing publicly, with thick fire-retardant lead respectively through 5 Φ 64700PF feedthrough capacitors receive+12V ,+5V ,+5V ,-the 5V input of totally 4 tunnel high stability voltage-stabilized power supplies; The shared a reference source of 4 tunnel high stability voltage-stabilized power supplies; all adopt the series connection voltage regulation way: High-power Semiconductor Triode+high-operational amplifier (OPA27); it is pre-steady that 2 grades of boost switching Voltage stabilizing module → EMI filtering → integrated regulators etc. are all passed through in the power supply of amplifier; the sampling divider resistance is high-accuracy metalfilmresistor; all adopt 4 line system modes for reducing equivalent output resistance; 4 road inputs are all gone here and there with overheated self-shield resistance; output serial connection current foldback circuit; 2 tunnel+5V power supply is for enlarging all in addition OTL output after amplifier of output current, thereby guarantees voltage-regulation coefficient～10 -6Magnitude current stability, 10 -5Magnitude (before the output feedthrough capacitor).The output of 4 tunnel high stability voltage-stabilized power supplies is all drawn (connecing shell) by 5 Φ, 6 4700PF feedthrough capacitors publicly;
See Fig. 8, long and medium wave directional aerial group is the long and medium wave directional aerial group of double antenna.Double antenna system seals inductance by the high ε medium of the low-loss that is installed together and wears meander line and prolong the accurate logarithm period plate aerial of oscillator and Single-chip Controlling and can the section of satisfying switch the extraordinarily long manganese-zinc ferrite body antenna of many segment of double mutual group and become the amphiorentation antenna to receive, and plate aerial passes through that the SFF-50-3 coaxial cable links to each other with the SMA antenna input socket of modulation and frequency spectrograph through the flame proof head of flameproof enclosure, ferrite antenna then links to each other with 3 group of 7 core antenna input socket of total power instrument through the flame proof head of flameproof enclosure by 16 SFF-50-1.5 cables that fire-retardant crust clads.Two kinds of antennas all have directionality more than the middle-end of frequency acceptance band, utilize the high ε medium of low-loss in the amphiorentation antenna seal inductance wear meander line prolong the accurate logarithm period plate aerial of oscillator 8 font directionality of the antenna main lobe directionality of medium wave and middle long wave and the extraordinarily long manganese-zinc ferrite body antenna of many segment of double realize ± 15 ° horizontal plane antenna location, and utilization can carry out the received signal measuring polarization characteristics at the vertical direction half-twist; And utilize triangulation location at a distance of 2 placement antennas of certain distance, measure respectively the source with 2 between line De Long degree between the angle of line and 2, the orientation of obtaining coal-bed gas radio radiation source reaches the length of normal of line between 2 o'clock.Among the figure, the 1st, 16 road flame proof handling cables of external magnetic antenna; The 2nd, external plate aerial flame proof is carried coaxial cable; The 3rd, the loading colour coding inductance of its extended line of connection plate aerial Zhi Ganyu; The 4th, the extended line of plate aerial Zhi Gan; The 5th, the trunk of accurate log-periodic antenna and Zhi Gan; The 6th, the medium wave ferrite bar that forms by two sections splicing of external magnetic antenna; The 7th, 16 of coiling sections coils on the ferrite bar;
The key technical indexes of above equipment is:
Modulation system coal-bed gas radio radiation receiving system: sensitivity≤0.2 ° K (τ=2S, Δ f ≈ 7MHz), gain stability ± 0.33%/per hour, frequency bandwidth 1KHz～7MHz (3db), frequency bandwidth controlled range 10KHz～7MHz, input noise coefficient 2db (representative value), complete machine gain 120～140db, program-controlled gain ranging 70db, complete machine output voltage 〉=± 1V;
Total power formula coal-bed gas radio radiation receiving system: sensitivity≤0.5 ° K (τ=1S, Δ f=7MHz), gain stability≤± 2%/per 10 minutes, frequency bandwidth 1KHz～7MHz (3db), frequency bandwidth controlled range 10KHz～7MHz, noise coefficient 3db (representative value), complete machine gain 100～120db, AGC control range 〉=60db, complete machine output voltage 〉=± 1V;
High intermediate frequency heterodyne sweep-frequency B coal-bed gas radio radiation frequency spectrum receiving system: frequency sweep frequency bandwidth 〉=5KHz～1.3MHz (3db), moment passband ≈ 1KHz-5KHz (can select), noise coefficient≤4db (representative value), complete machine gain～100db, full frequency band frequency sweep time～1-12S (can select), intermediate frequency rejection ratio 〉=25db, complete machine output voltage 〉=± 1V;
Clamp-on goes into formula CPU center control data processes and displays device: single board computer, Ban Load CPU AMD LX800 dominant frequency 500MHz, internal memory 512MB, memory 8G, can move WIN XP operating system, A/D 12bit 100KHz, D/A 12bit33KHz, 6.4 o'clock TFT LCD and coloredly show, contain RS232, RJ45 interface, have complete programme-control and regulate data and handle storage display alarm software;
Voltage-stabilized power supply: explosion-proof chargeable battery group, support whole system 8 continuous throughout the twenty-four hour24s, accurate voltage-stabilized power supply voltage-regulation coefficient ≈ 10 at least -6, ripple and noise voltage ≯ 0.33mVp_p (50Hz-20MHz);
Long and medium wave directional aerial group: plate aerial, but working band 〉=1KHz～1.5MHz, center band gain 〉=6db, center band antenna main lobe half-power width ≈ ± 15 °, ferrite antenna, but working band 10KHz～1MHz, can divide the mechanical tuning of 64 sections frequency range Single-chip Controlling;
The detailed operation principle of the said equipment is as follows:
1, modulation system coal-bed gas radio radiation receiving system operating principle: the signal that is come by antenna enters low insertion loss (＜0.2db by antennal interface, 0～7MHz) three port video modulator, after the 12.5Hz square-wave frequency modulation, enter low noise J-FET video preamplifier (Nf:2db, Gmax:37db), this amplifier is for reducing 1/f noise and high frequency white noise and reducing dc shift, the first order has adopted low noise J-FET differential pair tube to do the difference amplification and with transistor pipe has been constituted constant-current source, and the second level has adopted low noise J-FET differential pair tube to make the difference source follower equally.For the high frequency that makes the output DC level be bordering on zero level and compensation FET difference amplifier descends, adopted the high cmrr instrument that constitutes by two high-speed wideband low noise double operationals and four ± 0.1% high-accuracy resistance with amplifying circuit and frequency compensation in addition, obtained almost flat response and mv level output offset from 0～6.5MHz.Signal after the amplification enters multi-octave BREATHABLE BANDWIDTH amplifier, for reducing back level noise, the first order still adopts high-speed wideband low noise amplifier, the two or three grade of BREATHABLE BANDWIDTH circuit based on analog multiplier for the band frequency feedback, the fourth stage is the buffering emitter follower, can obtain fh (3db) from the adjustable LPF regulating effect of 10KHz～14MHz, but but also computer program control of hand adjustment, gain G max:12db.For regulating output level and isolating back level influence, add film at its output and isolated attenuator, its attenuation can be selected between 10～30db.Disturb in order to suppress to decide the frequency long wave, suppressed for the rowland that knows-C navigation 100KHz, unknown long-wave communication 10KHz, 15KHz, the second order that is made of high-speed wideband low noise double operational three that the spy has added these three frequencies is active bandstop filter frequently, because the even-order harmonic of the synchronous phase detector of this modulation system receiver suppresses ability, disturb first-harmonic to be with for 50Hz (12.5 * 4) civil power and prevent system.For isolate and compensate the loss of active filter and mismatch special add the broadband buffer amplifier that one-level high-speed wideband low noise amplifier constitutes (Δ f:0-60MHz, Gmax:6db).Be exactly the adjustable gain master video amplifier afterwards, it has two characteristics: the one, have the overshoot cut-off circuit that constitutes by the broadband cmos analog switch, controlled by overshoot excision control signal, when the excision modulator switch is closed because of repeatedly the beat shake waveform in the square wave envelope forward position of causing of dry-reed contact; The 2nd, have adjustable gain circuit based on analog multiplier, be subjected to the embedded type CPU programme-control also can be manual, gain variation range reaches+35db～-35db.High-end 20～the 30MHz that reaches of main amplifier passband, Gmax can reach 60db.Connect low temperature behind the main amplifier and float two differential pair tube multiplication of voltage wave detectors, by being encapsulated in the band temperature-compensating that the two differential pair tubes of a silicon crystal triode in the shell constitute and the multiplication of voltage detecting circuit of silicon diode starting voltage compensation, the effective input voltage range of its detection can be from 10～750mV.Thereafter the video dc amplifier that constitutes of the wideband low noise amplifier of regulating for the band output offset can be regulated output offset and is≤1mV when no input voltage.About 3 times of voltage gain.Send into the synchronous integration circuit that constitutes by two broadbands cmos analog switch and wideband low noise amplifier through looking after putting, it drives with modulated square wave synchronous, can greatly suppress and nonsynchronous interference of modulated square wave and noise signal the big antijamming capability of Strong modulation system radiation receiving equipment greatly.Signal is sent into the locking phase detecting circuit of two broadband cmos analog switches and wideband low noise amplifier formation after synchronous integration, with the synchronous control signal effect of modulated square wave under, under the modulated square wave envelope, demodulate useful signal, through the direct current signal of a representative antennas input signal Strong degree of active integrator accumulation back output, deliver to first A/D input of embedded type CPU again.
2, total power formula coal-bed gas radio radiation receiving equipment operating principle: by the next signal of the many segmented antenna of lengthening ferrite, through the multichannel antennal interface enter by outside send into the signal that comes by antenna after 64 tuning frequency primary election of multiple spot low insertion loss wideband video switching regulator mechanical tuning circuit of single-chip microcomputer front end Frequency Selection Controller control synchronously and enter low noise J-FET video preamplifier (Nf:2db by antennal interface, Gmax:37db), this amplifier is for reducing 1/f noise and high frequency white noise and reducing dc shift, the first order has adopted low noise J-FET differential pair tube to do the difference amplification and with transistor pipe has been constituted constant-current source, and the second level has adopted low noise J-FET differential pair tube to make the difference source follower equally.For the high frequency that makes the output DC level be bordering on zero level and compensation J-FET difference amplifier descends, adopted the high cmrr instrument that constitutes by two high-speed wideband low noise double operationals and four ± 0.1% high-accuracy resistance with amplifying circuit and frequency compensation in addition, obtained almost flat response and mv level output offset from 0～6.5MHz.Signal after the amplification enters multi-octave BREATHABLE BANDWIDTH amplifier, for reducing back level noise, the first order still adopts high-speed wideband low noise amplifier, the two or three grade of BREATHABLE BANDWIDTH circuit based on analog multiplier for the band frequency feedback, the fourth stage is the buffering emitter follower, can obtain fh (3db) from the adjustable LPF regulating effect of 10KHz～14MHz, but but also computer program control of hand adjustment, gain G max:12db.For regulating output level and isolating back level influence, add film at its output and isolated attenuator, its attenuation can be selected between 10～30db.Disturb in order to suppress to decide the frequency long wave, disturb first-harmonic to be suppressed for the rowland that knows-C navigation 100KHz, unknown long-wave communication 10KHz, 15KHz and 50Hz civil power, the second order four that is made of high-speed wideband low noise double operational that the spy has added these four frequencies is active bandstop filter frequently.For isolate and compensate the loss of active filter and mismatch special add the broadband buffer amplifier that one-level high-speed wideband low noise amplifier constitutes (Δ f:0-60MHz, Gmax:6db).Be exactly the program-controlled main video amplifier of AGC afterwards, the analog multiplier formula automatic gain control circuit that it has the carrier level detecting circuit and controls based on the comparator of fiduciary level, also can be subjected to the embedded type CPU programme-control, gain variation range reaches+35db～-35db.High-end 20～the 30MHz that reaches of main amplifier passband, Gmax can reach 60db.Connect low temperature behind the main amplifier and float two differential pair tube multiplication of voltage wave detectors, by being encapsulated in the band temperature-compensating that the two differential pair tubes of a silicon crystal triode in the shell constitute and the multiplication of voltage detecting circuit of silicon diode starting voltage compensation, the effective input voltage range of its detection can be from 10～750mV.Thereafter the video dc amplifier that constitutes of the wideband low noise amplifier of regulating for the band output offset can be regulated output offset and is≤1mV when no input voltage.About 6 times of voltage gain.Through looking the direct current signal of sending into the representative antennas input signal Strong degree of active integrator accumulation back output that 10 times of voltage gains are arranged that constitutes with the wideband low noise amplifier after putting, deliver to second A/D input of embedded type CPU.
3, high intermediate frequency heterodyne sweep-frequency B coal-bed gas radio radiation frequency spectrum receiving equipment operating principle: the signal that is come by antenna enters low noise J-FET video preamplifier (Nf:2db, Gmax:37db) by antennal interface, this amplifier is for reducing 1/f noise and high frequency white noise and reducing dc shift, the first order has adopted low noise J-FET differential pair tube to do the difference amplification and with transistor pipe has been constituted constant-current source, and the second level has adopted low noise J-FET differential pair tube to make the difference source follower equally.For the high frequency that makes the output DC level be bordering on zero level and compensation J-FET difference amplifier descends, adopted the high cmrr instrument that constitutes by two high-speed wideband low noise double operationals and the high-accuracy resistance of four error≤± 0.1% with amplifying circuit and frequency compensation in addition, obtained almost flat response and mv level output offset from 0～6.5MHz.Signal after the amplification has adopted low pass filter for the high-frequency signal that reduces beyond the frequency spectrograph working band causes high order difference frequency scattering frequency spectrum component, and (3db) 1.4MHz is to the 1.7MHz 25db that can decay for fh.Insert thereafter the broadband buffer amplifier that secondary high-speed wideband low noise amplifier constitutes (Δ f:0-60MHz, Gmax:26db).Disturb in order to suppress to decide the frequency long wave, long-wave communication 15KHz for the rowland that knows-C navigation 100KHz, the unknown, the second order dual frequency active bandstop filter that is made of high-speed wideband low noise double operational that the spy has added this frequency is suppressed, and disturbs first-harmonic because of can not considering beyond frequency spectrograph low side operating frequency as for 10KHz and 50Hz civil power.For regulating output level and isolating back level influence, add film at its output and isolated attenuator, its attenuation can be selected between 10～30db.Be exactly the multi-octave broadband mixer afterwards, it is 1.7MHz that this machine is got high intermediate frequency, just in time between medium wave broadcast wave band and short wave communication wave band, disturbs for reducing intermediate frequency, insert high Q intermediate frequency LC ripple device at the mixing input, the inhibition of the high intermediate frequency of 1.7MHz is reached 25db.Connect preposition high intermediate frequency amplifier behind the frequency mixer with 1.7MHz, after isolating, the unity gain amplifier that constitutes via the wideband low noise amplifier sends into the high if bandpas filter of 1.7MHz lumped parameter LC (Δ f ≈ 100KHz), for further compression passband has adopted the high intermediate frequency quartz-crystal filter of 1.7MHz (Δ f ≈ 1-5KHz, the inhibition of 30KHz place 〉=25db).After the crystalline substance filter is rearmounted high intermediate frequency amplifier, is the expansion out-put dynamic range, is inserting 4 times of in-phase amplifiers of one-level broadband big dynamically amplifier formation again as high intermediate frequency buffer amplifier thereafter.Amplification gain Gmax can reach 50db in the mixing.Connect low temperature after putting in the mixing and float two differential pair tube multiplication of voltage wave detectors, by being encapsulated in the band temperature-compensating that the two differential pair tubes of a silicon crystal triode in the shell constitute and the multiplication of voltage detecting circuit of silicon diode starting voltage compensation, the effective input voltage range of its detection can be from 10～750mV.Thereafter the video dc amplifier that constitutes of the wideband low noise amplifier of regulating for the band output offset can be regulated output offset and is≤1mV when no input voltage.About 6 times of voltage gain.Through look put after the direct current signal of a representative antennas input spectrum Strong degree of output, deliver to the 3rd A/D input of embedded type CPU.The frequency sweep local oscillator of frequency spectrograph is produced by DDS Direct Digital synthesized signal generator, the step-scan pattern, embedded type CPU control external trigger is synchronous, reference frequency output 1.705～3MHz (corresponding receive frequency range 10KHz～1.3MHz), step-scan spacing frequency 5-25KHz, step-scan about 0.05-0.2S blanking time (can select), about 1-12S of full frequency band frequency sweep time (can select).For reducing output distortion and reducing high order beat and the mutual distortion component that optical mixing process produces, output amplitude pact+13dbm.For further reducing high-order component and the digital noise in the local oscillator output, used the 10db film to isolate high-pass filter and the local oscillator buffer amplifier of the LPF of attenuator, 3.1MHz, 3db film isolation attenuator, 1.66MHz at DDS Direct Digital synthesized signal generator output, band is outer to be suppressed more than the 25db, make like this second harmonic in the DDS generator output signal (〉=3.4MHz) and high-order component suppress 25db at least, and the digital quantization noise in the DDS generator output signal has also obtained effective inhibition.Thereby improved to a great extent that frequency spectrum mixes, crossover and phase noise, improved the lower limit that the frequency spectrum display effect also reduced the frequency spectrum received signal and promptly improved the frequency spectrum receiving sensitivity.
4,, Clamp-on goes into formula CPU center control data processes and displays equipment operating principle: adopted veneer Industrial Personal Computer (IPC) when grinding the WAFER-LX-800 type 3.5 that Chinese workers control production, plate carries AMD LX-800 low-power consumption mobile model CPU, dominant frequency 500MHz, TDP≤6W (stand-by power consumption 1.4W), plate carries internal memory 512MB SDRAM, external 8GB CF card can move Windows XP operating system.Display is 6.4 o'clock colored TFT LCD, and resolution ratio is 640 * 480,260,000 looks, and brightness is 300cd/m 2, contrast 120: 1.Bian Change interface has adopted PCM-3718HD 12bit 100KHzA/D and PCLD-780 modulus signal keyset, and PCM-3712 12bit 33KHzD/A and ADAM-3909 digital and analogue signals keyset.Workflow is asked for an interview accompanying drawing 6, and this is full machine work main program, still has less important programs such as LO preset module, initialization module, status control module, interruption subroutine will embed arrangement, does not give unnecessary details here.
5, stabilized power supply device operating principle: explosion-proof rechargeable Ni-H 2 battery group is+15V ,+8V ,+8V ,-totally 4 groups of 8V, capacity is 10AH, every group of load current Fen Do is about 0.8A, 1A, 1.2A, 0.5A, attached in addition 4 groups of constant pressure and flow Ni-MH battery chargers charging, but full charge continuous operation later on is more than 8 hours.4 the tunnel (+12V ,+5V ,+5V ,-5V) stability＜100,000/ accurate voltage-stabilized power supply be the single-stage voltage stabilizing.Adopt the above amplifier of open-loop gain 120db to adjust amplifier.The required positive and negative voltage supplied of amplifier by positive and negative piezoelectricity pond boost Voltage stabilizing module after EMI filtering again through positive and negative three terminal regulator supply, + 18V and-15V power supply stability all is better than ± 0.5% * ± 1%=± 0.005%, the a reference source of+12V power supply is through the low noise 6V of the special band temperature-compensating of selecting voltage-stabiliser tube, the a reference source of+5V power supply is that 6V obtains through high-accuracy electric resistance partial pressure, a reference source all with supply amplifier power supply+the 18V power supply, a reference source is better than ± 0.005% * 0.02=± 0.0001% stability that cell voltage changes, and temperature coefficient is better than 10ppm.Be to reduce power supply output internal resistance, 4 groups of circuit of this stabilizator all adopt the output of 4 line systems, and the laod stability of output port reaches ± and 0.001%.Use for being fit to the down-hole, full machine does not adopt the Fuse Type fuse, all adopts overcurrent self-shield resistance.4 tunnel voltage-stabilized power supplies all contain over-current limit circuit.For reducing crosstalking between analog circuit and the digital circuit, two groups+5V power supply supplies receiving unit respectively Ji Clamp-on goes into formula CPU part.-5V power supply and supply receiving unit+the 5V power supply adopts ± 0.1% high-accuracy resistance to follow the tracks of voltage stabilizing, in case+the also no-voltage output of 5V power supply decompression-5V power supply, protected the safety of the integrated circuit of positive negative pressure power supply preferably.
6, high-gain long and medium wave directional aerial group operating principle: this antenna sets is a double antenna, and inductance wears the high ε medium of low-loss and seals logarithm period plate aerial and the many segmented antenna of double lengthening ferrite.Plate aerial is the 0.5M external diameter, but works fine is in the 2M wave band in theory, adopt the folding oscillator can work in the 4M wave band again, inductance can work in the 8-12M wave band after loading, after the outside was sealed and reached the medium of 8000-10000 with low-loss ε, can work in the 1000M wave band was about 300KHz, connect according to whip antenna work to reach λ/20 on low frequency more, then after efficient reduces, can work about 60KHz, can only sense about 1KHz certainly.Reach the ferrite antenna of 40cm as for length, as the resonant tank 10KHz that can work, but in fact have the frequency range of 8 font antenna radiation patterns to estimate can only arrive about the about 150KHz of long wave broadcast band, down its 8 font antenna radiation pattern is just not obvious again.
Among Figure 12, the A/D sampling order is S1 S2 D1 S3 S4 S5 S6 P1 S7 S8, wherein Sn: refer to frequency spectrograph data (n=1-8), D1: refer to enlightening gram instrument data, P1: refer to total power instrument data; And the processes and displays mode of its output data is: Dout: each second is once also storage demonstration on average; Pout: each second is once also storage demonstration on average; Sout: be the Smax among S1, S2, S3, S4 or S5, S6, S7, the S8, per 4 data are handled once and storage shows;
The utility model is used for the embodiment that coal mine underground coal bed gas radio radiation source is measured:
1, measures and to have or not the gas radio radiation: will include the driving face (generally being the work plane centre position) that the coal-bed gas radio receiving system that has flameproof enclosure of totally 6 equipment is transported to the colliery, plate aerial and ferrite antenna are aimed at rib, as modulation with total power is exported and the frequency spectrograph three all has indication, then show to have received signal.
2, judge to be gas radio radiation signal: left rotation and right rotation plate aerial and ferrite antenna are observed modulation and total power output reading and the frequency spectrograph demonstration on the LCD simultaneously at leisure, Strong when confirming whether to aim at rib, in this way, then be from the coal-bed gas radio radiation mostly; Otherwise, be that interference or antenna radiation pattern have problem mostly.
3, measure gas radio radiation source side position and distance: will include the end A point that the coal-bed gas radio receiving system that has flameproof enclosure of totally 6 equipment is transported to the driving face in colliery, baby compass on the nationality antenna is determined the angle [alpha] that the output maximum value in source is surveyed, move the other end B point of driving face again to and measure angle beta in accordance with the law, if the AB distance is L, then the source is r=tg α tg β/tg α+tg β to the vertical distance of L.
4, measure the radiation temperature in gas radio radiation source: will include driving face that the coal-bed gas radio receiving system that has flameproof enclosure of totally 6 equipment transports to the colliery to the intersection point of L and r promptly on the nearest point in gas source, with the position in antenna alignment source, the (that stays a minute goes into formula CPU Yin Clamp-on and will adjust automatically, calculate) can see on LCD that the radiation temperature value in source is Ji Pu Mine frequency value corresponding (must be through the Cooling and Heat Source calibration and actinal surface is calibrated and machine places " program control " but not manual position).
5, continue the variation and the early warning coal watt outburst danger in monitoring coal-bed gas radio radiation source: the emission types (stable state, unstable state, change, Pu Mine fast move) of roughly judging gas radio radiation source, and by continuing to monitor whether total power output reading increases fast and whether frequency spectrum Shu Chu Pu Mine moves to high-end, judge that gas radio radiation source region geology changes severe degree, as three's (modulation, total power, frequency spectrum) all increase Strong fast and with the Pu Mine to high-end situation of movement, then the machine buzzer that will glimmer automatically sends early warning sound.
6, boring actual measurement gas pressure set up radiation temperature, hang down apart from, ature of coal and gas pressure relation: measure vertical apart from place's boring, take a sample and measure gas pressure in the laboratory, in conjunction with ature of coal, hang down distance, radiation temperature opening relationships formula and Mathematical Modeling, might directly on LCD, show gas pressure.
7, go up well work shift data of playback and deposit on the mass computing work station later on, carry out integrated treatment behind the accumulation several times, obtain the steady state of radiation temperature in gas radio radiation source, obtain the Boltzmann temperature in gas radio radiation source and reverse interpretation gas enrichment region physical state in conjunction with geologic data and gas instrument measured data.

Claims (2)

1. coal bed gas radio spectrum direction-finding early warning system, it is characterized in that being provided with modulation system coal-bed gas radio radiation receiving system, total power formula coal-bed gas radio radiation receiving system, high intermediate frequency heterodyne sweep-frequency B coal-bed gas radio radiation frequency spectrum receiving system, Su and go into formula CPU center control data processes and displays device, explosion-proof rechargeable Ni-H 2 battery group and voltage-stabilized power supply and long and medium wave directional aerial group, wherein:
Modulation system coal-bed gas radio radiation receiving system, active bandstop filter, broadband buffer amplifier, the adjustable gain master video amplifier, low temperature float two differential pair tube multiplication of voltage wave detectors, video dc amplifier, synchronous integrator, synchronous phase detector, active integrator, phase-locked sync generator, multichannel cmos buffer device and overshoot excision control signal delay circuit frequently to contain broadband beam antenna interface, three port video modulators, low noise video preamplifier, multi-octave BREATHABLE BANDWIDTH amplifier, optional film isolation attenuator, three; Enter the signal input port of three port video modulators through the broad-band antenna interface by the next aerial signal of broadband beam antenna, another input port of three port video modulators connects 50 Ω terminate loads, the driving square wave input of three port video modulators is received wherein one road delivery outlet of multichannel cmos buffer device 7 road synchronous square-wave signals output, aerial signal after the square wave modulation is received the input of low noise video preamplifier by the signal output port of three port video modulators, the output of low noise video preamplifier is received the signal input part of multi-octave BREATHABLE BANDWIDTH amplifier, the program control signal input of multi-octave BREATHABLE BANDWIDTH amplifier receive embedded type CPU 3 road D/A output one of modulation bandwidth programme-control voltage output, the signal output part of BREATHABLE BANDWIDTH amplifier is received the input that optional film is isolated attenuator, optional film is isolated the input that the attenuator output is received the active bandstop filter of three frequencies, the output of the active bandstop filter of three frequencies is received the input of broadband buffer amplifier, the output of broadband buffer amplifier is received the signal input part of the adjustable gain master video amplifier, the driving square wave input of the overshoot cut-off circuit of the adjustable gain master video amplifier is received the output of overshoot excision control signal delay circuit, the adjustable gain program control signal input of the adjustable gain master video amplifier receive embedded type CPU 3 road D/A output one of modulation gain programme-control voltage output, the output of the adjustable gain master video amplifier is received the input that low temperature floats two differential pair tube multiplication of voltage wave detectors, the output that low temperature floats two differential pair tube multiplication of voltage wave detectors is received the input of video dc amplifier, the output of video dc amplifier is received the signal input part of synchronous integrator, the two-phase of synchronous integrator drives the delivery outlet that the square wave input is received the wherein two-way of multichannel cmos buffer device, the signal output part of synchronous integrator is received the synchronous phase detector signal input part, the two-phase of synchronous phase detector drives the delivery outlet that the square wave input is received the wherein two-way of multichannel cmos buffer device 7 road synchronous square-wave signals output, the signal output part of synchronous phase detector, receive the input of active integrator, direct current signal through a representative antennas input signal Strong degree of output behind the active integrator integration, the output of active integrator is received first A/D input port of embedded type CPU, it is the modulation-demodulation signal input port, all modulated square wave signals produce by phase-locked sync generator, the square wave output of phase-locked sync generator is received the input of multichannel cmos buffer device, the reference signal input of phase-locked sync generator is received the phase-locked reference signal delivery outlet of embedded type CPU, multichannel cmos buffer device has the output of 7 road CMOS level synchronization square-wave signals, wherein 2 tunnel two-phases of receiving synchronous phase detector drive the square wave input, 2 tunnel two-phases of receiving synchronous integrator drive the square wave input in addition, also have 2 tunnel two-phases of receiving overshoot cut-off circuit control signal delay circuit to drive the square wave input, last 1 the tunnel receives the driving square wave input of three port video modulators;
Total power formula coal-bed gas radio radiation receiving system contains many segmented antenna interface, wideband video switching regulator mechanical tuning circuit, outer single-chip microcomputer front end Frequency Selection Controller synchronously, low noise video preamplifier, multi-octave BREATHABLE BANDWIDTH amplifier, optional film and isolates attenuator, four active bandstop filter, broadband buffer amplifier, the program-controlled main video amplifier of AGC, low temperature float two differential pair tube multiplication of voltage wave detectors, video dc amplifier and active integrator frequently; The multichannel aerial signal that is come by many segmented ferrites antenna enters wideband video switching regulator mechanical tuning circuit through many segmented antenna interface, the signal output part of this wideband video switching regulator mechanical tuning circuit is delivered to the aerial signal of a certain frequency of selecting the input of low noise video preamplifier, wideband video switching regulator mechanical tuning circuit is by the control of outer single-chip microcomputer front end Frequency Selection Controller synchronously, the outer external synchronization signal input of single-chip microcomputer front end Frequency Selection Controller is synchronously received the single-chip microcomputer external synchronization signal delivery outlet of embedded type CPU, the output of low noise video preamplifier is received multi-octave BREATHABLE BANDWIDTH amplifier input terminal, the optional film of the output of multi-octave BREATHABLE BANDWIDTH amplifier is isolated the input of attenuator, the output of optional film isolation attenuator is received the input of four frequency source bandstop filters, and the output of the active bandstop filter of four frequencies is received the input of broadband buffer amplifier.The output of broadband buffer amplifier is received the signal input part of the program-controlled main video amplifier of AGC, the signal output part of the program-controlled main video amplifier of AGC is received the input that low temperature floats two differential pair tube multiplication of voltage wave detectors, the program control signal input of the program-controlled main video amplifier of AGC receive embedded type CPU 3 road D/A output one of total power gain procedure control voltage output end, the output that low temperature floats two differential pair tube multiplication of voltage wave detectors is received the input of video dc amplifier, the output of video dc amplifier is received the input of active integrator, the direct current signal of a representative antennas input signal Strong degree of output behind the active integrator integration, the output of active integrator is received second A/D input of embedded type CPU, i.e. total power restituted signal input port;
High intermediate frequency heterodyne sweep-frequency B coal-bed gas radio radiation frequency spectrum receiving system contains the broadband beam antenna interface, the low noise video preamplifier, low pass filter, the broadband buffer amplifier, optional film is isolated attenuator, the dual frequency active bandstop filter, the multi-octave frequency mixer, preposition high intermediate frequency amplifier, high if bandpas filter, high intermediate frequency quartz-crystal filter, the high intermediate frequency amplifier of back level, high intermediate frequency buffer amplifier, low temperature floats two differential pair tube multiplication of voltage wave detectors, the video dc amplifier, integrator, program-controlled DDS Direct Digital is synthesized the local oscillation signal generator, high-pass filter and local oscillator buffer amplifier; By the next aerial signal of broadband beam antenna, receive the input of low noise video preamplifier through the broadband beam antenna interface, the output of low noise video preamplifier is received the input of low pass filter, the output of low pass filter is received the input of broadband buffer amplifier, the output termination film of broadband buffer amplifier is isolated the input of attenuator, the output of film isolation attenuator is received the input of dual frequency active bandstop filter, the output of active bandstop filter is received the signal input part of multi-octave broadband mixer, inserts high Q intermediate frequency LC mouth ripple device at the signal input part of multi-octave broadband mixer; The local oscillator input of multi-octave broadband mixer is received the output of local oscillator buffer amplifier, high intermediate frequency signal output part after the frequency conversion of multi-octave broadband mixer is received the input of preposition high intermediate frequency amplifier, the output of preposition high intermediate frequency amplifier is received the input of the high if bandpas filter of lumped parameter, the output of high if bandpas filter is received the input of high intermediate frequency quartz-crystal filter, the output of quartz-crystal filter is received the input of rearmounted high intermediate frequency amplifier, and the output of rearmounted high intermediate frequency amplifier is received the input of big dynamic high intermediate frequency buffer amplifier.The output of high intermediate frequency buffer amplifier is received the input that low temperature floats two differential pair tube multiplication of voltage wave detectors, the output that low temperature floats two differential pair tube multiplication of voltage wave detectors is received the input of video dc amplifier, obtain the direct current signal of a representative antennas input spectrum Strong degree behind the output process integrator integration noise suppression of video dc amplifier, deliver to the 3rd A/D input of embedded type CPU, it is frequency spectrum restituted signal input port, the frequency sweep local oscillator of frequency spectrograph is produced by program-controlled DDS Direct Digital synthesized signal generator, the external trigger synchronous signal input end of program-controlled DDS Direct Digital synthesized signal generator is received the local oscillator external trigger synchronizing signal delivery outlet of embedded type CPU, the local oscillator output of program-controlled DDS Direct Digital synthesized signal generator is received the input that the 10db film is isolated attenuator, the output of film isolation attenuator is received the input of low pass filter, the output of low pass filter is isolated the input that attenuator is received high-pass filter through the 3db film, the output of high-pass filter is received the input of local oscillator buffer amplifier, and the output of local oscillator buffer amplifier is received the local oscillator input of multi-octave broadband mixer;
Su goes into formula CPU center control data processes and displays device: veneer CPU, 512MDDR internal memory and the 8G CF card memory, the 12bit 100KHz16 that contain operation WIN XP operating system select 1 A/D converter, 3 road 12bit 33KHzD/A converters, LCD display and corresponding A/D, D/A change-over panel and corresponding I/O interface;
Explosion-proof rechargeable Ni-H 2 battery group and voltage-stabilized power supply: comprise+15V ,+8V ,+8V ,-8V, 4 groups of rechargeable Ni-H 2 battery groups and corresponding 4 groups of constant pressure and flow Ni-MH battery chargers and+12V ,+5V ,+5V ,-5V, 4 tunnel voltage-stabilized power supplies and corresponding EMI protection, filtering, decoupling, overheated, overcurrent, short-circuit protection circuit;
Long and medium wave directional aerial group is an amphiorentation reception antenna group, is provided with the many segmented antenna of double lengthening ferrite that accurate logarithm period plate aerial in broadband and Single-chip Controlling are switched.
2. coal bed gas radio spectrum direction-finding early warning system according to claim 1 is characterized in that: modulation system coal-bed gas radio radiation receiving system, total power formula coal-bed gas radio radiation receiving system and high intermediate frequency heterodyne sweep-frequency B coal-bed gas radio radiation frequency spectrum receiving system are contained in same flame proof iron and close the interior common signal that receives from same radiation source of triple channel that constitutes.
CN2010201053412U 2010-02-01 2010-02-01 Coal bed gas radio frequency spectrum direction finding early warning system Expired - Fee Related CN201687522U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105068123A (en) * 2015-08-05 2015-11-18 中国矿业大学 Electromagnetic radiation positioning method for coal and rock dynamical disasters
CN109889164A (en) * 2019-04-11 2019-06-14 中电科技德清华莹电子有限公司 A kind of multi-mode radio frequency low noise amplifier module for Global Navigation Satellite System

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105068123A (en) * 2015-08-05 2015-11-18 中国矿业大学 Electromagnetic radiation positioning method for coal and rock dynamical disasters
CN105068123B (en) * 2015-08-05 2019-09-03 中国矿业大学 A kind of coal rock dynamic disaster electromagnetic radiation localization method
CN109889164A (en) * 2019-04-11 2019-06-14 中电科技德清华莹电子有限公司 A kind of multi-mode radio frequency low noise amplifier module for Global Navigation Satellite System
CN109889164B (en) * 2019-04-11 2024-04-02 中电科技德清华莹电子有限公司 Multimode radio frequency low noise amplifier module for global navigation satellite system

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