CN202093185U - Automatic positioning very-low-frequency electromagnetic instrument - Google Patents
Automatic positioning very-low-frequency electromagnetic instrument Download PDFInfo
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- CN202093185U CN202093185U CN2011201314972U CN201120131497U CN202093185U CN 202093185 U CN202093185 U CN 202093185U CN 2011201314972 U CN2011201314972 U CN 2011201314972U CN 201120131497 U CN201120131497 U CN 201120131497U CN 202093185 U CN202093185 U CN 202093185U
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Abstract
The utility model discloses an automatic positioning very-low-frequency electromagnetic instrument, which comprises an electromagnetic induction signal receiving unit, a signal processing unit and an output unit and also comprises a GPS (global positioning system) directional unit and an electronic directional unit, wherein the GPS directional unit, the electronic directional unit and the electromagnetic induction signal receiving unit are respectively connected with the signal processing unit to transmit the GPS signal, the direction signal and the electromagnetic induction signal to the signal processing unit, and the signal processing unit is connected with the output unit and transmits the data to the output unit for outputting. In the utility model, the GPS directional unit is adopted to acquire the measuring point positioning information, an electronic directional compass is used for acquiring the measuring direction, and the GPS directional unit and the electronic directional compass are together used for determining measuring lines and measuring points so as to reduce the human error; a receiving antenna and a very-low-frequency band receiving module are adopted, so that the noise interference to the detected electromagnetic induction signal is low, the data can be directly displayed, read and stored, the error brought by the manual record is reduced, and the measurement is accurate; and a magnetic rod antenna is adopted to improve the anti-interference ability of the signal receiving.
Description
Technical field
The utility model relates to a kind of surveying instrument of electromagnetic induction signal, relates in particular to the automatic location very low frequency electromagnetical receiver of the electromagnetic induction signal difference that a kind of electromagnetic wave of measuring very low frequency (VLF) radio station emission causes.
Background technology
The magnetic component that vertical electric dipole produced that is positioned at the face of land has only horizontal component, if in the far field and consider field in the limited area, primary field approaches along the face of land to be close to the transverse magnetic field plane wave of the incident that is oriented in a tangential direction usually.Electrical discrepant geologic body in underground part or interphase, under the effect of horizontal primary field, will induce secondary field, then vertical component must appear, primary field is identical with the secondary field frequency, but phase place and amplitude are inconsistent, their interaction forms synthetic, synthetic elliptical polarization spatially (synthetic track is oval), the tangent value of its polarization ellipse inclination angle D angle of Z-axis (ellipse short shaft with) is directly proportional with the secondary field vertical component, therefore, measure the variation at polarization ellipse inclination angle, in fact just can reflect the variation of induction secondary field vertical component.
Very low frequency electromagnetical receiver just the electromagnetic wave (radiowave of 15-25KHz wave band) by measuring the emission of very low frequency (VLF) radio station on the face of land, aerial or electromagnetic induction signal difference that the subsurface investigation field causes; thereby obtain the electrical property feature of measurement zone geologic body, and then judge the abnormal information of the electrically unusual or underground structure of geologic body.At present, very low frequency electromagnetical receiver has become survey instrument important in underground water detection, prospecting for mineral deposits and the geologic mapping, especially at aspects such as surveying the latent metal mineralising low-resistance band of shallow-layer, structure shatter belt and moisture fracture fissure zone very large effect is arranged.
Existing very low frequency electromagnetical receiver needs to reserve survey line and measuring point according to measurement requirement by survey crew in surveying the district earlier in measuring process, and carry out mark at measuring point, operating personnel begin to measure according to measurement markers more then, this mode is not only lost time and human resources, and the opposing party makes mistakes in close-in measurement easily.Simultaneously, measurement result is projected to also often need the gps measurement data that adds on the map.
Summary of the invention
The purpose of this utility model is to overcome existing very low frequency electromagnetical receiver needs artificial location defect, and a kind of novel automatic location very low frequency electromagnetical receiver is provided, and can locate automatically, direction finding.
Automatically the location very low frequency electromagnetical receiver comprises electromagnetic induction signal receiving element, signal processing unit and output unit, also comprise GPS directed element and electronics directed element, GPS directed element, electronics directed element and electromagnetic induction signal receiving element are connected signal processing unit respectively, gps signal, direction signal and electromagnetic induction signal are transferred to signal processing unit, and signal processing unit connects output unit and transmits data to be exported to output unit.
Described electromagnetic induction signal receiving element comprises receiving antenna and very low frequency (VLF) wave band receiver module, and receiving antenna inductive electromagnetic signal also is transferred to very low frequency (VLF) wave band receiver module with signal, the amplitude of very low frequency (VLF) wave band receiver module output electromagnetic signal.
Described electromagnetic induction signal receiving element also comprises the phase-locked loop circuit that is used for stable electrical magnetic signal frequency, and phase-locked loop circuit is connected with very low frequency (VLF) wave band receiver module.
Described electromagnetic induction signal receiving element also comprises the measurement of dip angle module that is used to measure magnetic dip.Measurement of dip angle module transmission measurement data are given signal processing unit.
Described very low frequency (VLF) wave band receiver module comprises a wave filter, a frequency mixer, DDS frequency generation module, AGC automatic gain control circuit, intermediate frequency amplifier circuit, detecting circuit and filtering circuit, the input end that is used for the electromagnetic induction signal filter filtering is connected with the output terminal of receiving antenna, and output terminal connects frequency mixer; DDS frequency generation module output terminal is connected with frequency mixer; The electromagnetic induction signal of wave filter input is connected the intermediate frequency amplifier circuit that is used for the intermediate-freuqncy signal amplification with the output terminal that the signal that DDS frequency generation module produces is formed the frequency mixer of harmonic ringing, intermediate frequency amplifier circuit is connected with filtering circuit successively with detecting circuit, the amplitude of filtering circuit output electromagnetic induction signal; The input end of AGC automatic gain control circuit is connected with the output terminal of detecting circuit, and output terminal is connected with intermediate frequency amplifier circuit.The electromagnetic induction signal that receiving antenna receives is after wave filter filters in the input mixer, form harmonic ringing with the electromagnetic signal that DDS frequency generation module produces, be input to intermediate frequency amplifier circuit and carry out the intermediate-freuqncy signal amplification, the intermediate-freuqncy signal of amplifying is converted to the amplitude output of institute's selected frequency electromagnetic induction signal behind detecting circuit and filtering circuit, the output terminal of AGC automatic gain control circuit input termination filtering circuit, output termination intermediate frequency amplifier circuit.Receiving antenna end band filter plays and eliminates antenna noise jamming and preliminary election long wave frequency.And frequency mixer with filtering after the signal that produces of signal and DDS frequency generation module form resonance signal, to select the radio signals of different frequency.Harmonic ringing is not enough to the amplification of small-signal by AGC automatic gain control circuit solution fixed intermediate frequency signal amplification factor then, supersaturation problem of dtmf distortion DTMF to large-signal, reach and guarantee that intermediate-freuqncy signal does not change with radio signals is strong and weak, impels the signal effect of tending towards stability.Last signal is by the amplitude of detecting circuit and filtering circuit output electromagnetic induction signal.
Described receiving antenna is for receiving the magnetic rod antenna of 15-25KHz wave band.
Described magnetic rod antenna comprises bar magnet, aerial coil, lead-in wire and radome, and aerial coil is on bar magnet, and lead-in wire is connected the aerial coil two ends, and radome is enclosed within outside the aerial coil.Bar magnet is made by soft magnetic ferrite.Have higher magnetoconductivity and resistivity, stronger directivity can improve the antijamming capability of receiving antenna
Described output unit comprises display module and host communication interface, and display module is connected with the main control module respectively with the host communication interface.The display module video data, the host communication interface is realized and upper machine communication.
Described signal processing unit comprises the main control module that is used for data processing and control and is used for the internal storage of data storage that internal storage is connected with the main control module.Described output unit comprises display module and host communication interface, and display module is connected with the main control module respectively with the host communication interface.The display module video data, the host communication interface is realized and upper machine communication.
Described signal processing unit also comprises the outside extended memory interface unit that is used to connect external memory storage, and outside extended memory interface unit is connected with the main control module.
Described GPS directed element is the D-GPS global positioning receiver.
The electronics directed element is the electronics bearing compass.
The beneficial effects of the utility model:
1, adopt the GPS directed element to obtain the locating information of measuring point, the electronics directed element obtains the direction of survey line, and both finish determining of survey line and measuring point jointly, have reduced personal error.
2, adopt receiving antenna and very low frequency (VLF) wave band receiver module, detected electromagnetic induction signal noise jamming is little, can directly show, read and store data by signal processing unit and output unit, reduce the mistake that manual record brings, also reduce personnel's work.
3, each unit in the very low frequency (VLF) wave band receiver module makes detection signal reliable and stable, disturbs for a short time, and it is accurate to detect data.
4, adopt magnetic rod antenna can improve the antijamming capability that signal receives.
5, adopt the main control module and the internal storage of signal processing unit, guarantee the real-time measurement and the storage of measurement data, do not needed manual record, and main control module output digital signal, manually reading has reduced the intensity of surveying work and the human factor of measurement result.
6, all of digital very low frequency electromagnetical receiver are unit-modularized, and volume is little, and are easy to carry, simple to operate, easier popularization.
Description of drawings
Fig. 1 is an illustrative view of functional configuration of the present utility model;
Fig. 2 is the structural representation of the utility model embodiment;
Fig. 3 is the structural representation of very low frequency (VLF) wave band receiver module among Fig. 2;
Fig. 4 is the main TV structure synoptic diagram of magnetic rod antenna among Fig. 2;
Fig. 5 is the side-looking structural representation of magnetic rod antenna among Fig. 2.
Embodiment
Below in conjunction with accompanying drawing automatic location of the present utility model very low frequency electromagnetical receiver is described in detail.
Automatic location of the present utility model very low frequency electromagnetical receiver comprises electromagnetic induction signal receiving element 10, GPS directed element 40, electronics directed element 50, signal processing unit 20 and output unit 30, and electromagnetic induction signal receiving element 10, signal processing unit 20 and output unit 30 are connected successively.GPS directed element 40, electronics directed element 50 and electromagnetic induction signal receiving element 10 are connected signal processing unit 20 respectively, gps signal, direction signal and electromagnetic induction signal are transferred to signal processing unit, and signal processing unit 20 processing signals data also send to output unit 30 outputs.(referring to Fig. 1)
GPS directed element 40 in the present embodiment is the D-GPS global positioning receiver, and the D-GPS global positioning receiver has an omnidirectional antenna, is used to receive gps signal, obtains the locating information of measuring point; Electronics directed element 50 is the electronics bearing compass; Determining of survey line and measuring point finished jointly with electronics directed element 50 in gps signal unit 40.
Referring to Fig. 2, electromagnetic induction signal receiving element 10 comprises receiving antenna 1 and very low frequency (VLF) wave band receiver module 2, receiving antenna 1 inductive electromagnetic signal also is transferred to very low frequency (VLF) wave band receiver module 2 with signal, and the amplitude of very low frequency (VLF) wave band receiver module 2 output electromagnetic induction signals is given the main control module 201 of signal processing unit 20.
The electromagnetic induction signal unit also comprises phase-locked loop circuit 3 and measurement of dip angle module 4, and phase-locked loop circuit 3 is used for stablizing the frequency of very low frequency (VLF) wave band receiver module 2 from the electromagnetic induction signal of receiving antenna acquisition, is connected with very low frequency (VLF) wave band receiver module 2.Phase-locked loop circuit 3 is connected with main control module 201 simultaneously, accepts the control of main control module 201.Measurement of dip angle module 4 is connected with main control module 201, measures the magnetic dip data and measurement data is transferred to the main control module 201 of signal processing unit 20.
Referring to Fig. 3, very low frequency (VLF) wave band receiver module 2 comprises a wave filter, one frequency mixer, DDS frequency generation module, the AGC automatic gain control circuit, intermediate frequency amplifier circuit, detecting circuit and filtering circuit, the electromagnetic induction signal that receiving antenna receives passes through in the input circuit input mixer after wave filter filters, form harmonic ringing with the electromagnetic signal that DDS frequency generation module produces, be input to intermediate frequency amplifier circuit and carry out the intermediate-freuqncy signal amplification, the intermediate-freuqncy signal of amplifying is through the detecting circuit detection, after output institute selected frequency electromagnetic induction signal amplitude after filtering circuit filtering again.And AGC automatic gain control circuit input termination detecting circuit output terminal, output termination intermediate frequency amplifier circuit.The AGC automatic gain control circuit guarantees that intermediate-freuqncy signal does not change with radio signals is strong and weak, impels signal to tend towards stability.
The signal processing unit 20 of the automatic location very low frequency electromagnetical receiver of present embodiment comprises main control module 201, internal storage 202, outside extended memory interface unit 203, internal storage 202 is connected with main control module 201 respectively with outside extended memory interface unit, and main control module 201 is carried out data processing and control; Internal storage 202 storage data; Outside extension storage interface 203 connects external memory storage.Be used for the growth data storage.Signal processing unit 20 can also comprise a keyboard components 204, and keyboard components 204 is responsible for the input of man-machine interaction control signal.As shown in Figure 2.Main control module 201 can be a single-chip microcomputer.
Automatically the location very low frequency electromagnetical receiver also comprises Power Supply Assembly, is above-mentioned electromagnetic induction signal receiving element 10, signal processing unit 20 and output unit 30 power supplies.
Referring to Fig. 4 and Fig. 5, the receiving antenna 1 that present embodiment adopts is for receiving the magnetic rod antenna of 15-25KHz wave band, comprise bar magnet 11, aerial coil 12, lead-in wire 13 and radome 14, aerial coil 12 is on bar magnet 11, lead-in wire 13 is connected the two ends of aerial coil 12, and radome 14 is enclosed within outside the aerial coil 12.
What the principle of work of digital very low frequency electromagnetical receiver adopted is a kind of alternating current magnetic method that works in the 15-25KHz wave band.Experiment shows, (under the f＜105Hz), the electric conductivity of rock and ore mainly shows as conduction current, and the electric conductivity of rock and ore depends primarily on their conductivity at low frequency.And the resistivity feature of rock and ore shows, different rocks has different conductivity, and this explanation is healed when obvious when the electrical property difference of study area geologic body to be detected and its country rock, and the off-note of geophysical measurement is also healed obvious.In addition, grow the location at the structure shatter belt, the physico-chemical property obvious difference of structure shatter belt and its both sides country rock (weak shifting ground plastid), especially in the structure shatter belt, grown by the filling of polymetallic ore arteries and veins, mineralized alteration zone, and the relative growth and the enrichment of fault gouge, clay mineral and underground water, crevice water, in the very low frequency (VLF) electromagnetic measurement, all there is tangible low-resistance to reflect unusually usually.The very low frequency (VLF) electromagnetic measurement just is being based on the geologic body space, and to form the distribution of conductivity of (mineral, rock) inhomogeneous, is that it is measured polarization ellipse inclination angle and changes thereby cause the measured value of very low frequency (VLF) surveying instrument, reflects the electrical property feature of land burial body indirectly.High-precision GPS measuring technique and very low frequency (VLF) measuring technique combined together not only can increase work efficiency greatly, and can promote the very low frequency (VLF) broad application greatly.
Using method:
Measure to prepare: in the measurement point start, the machine self check is also searched for the very low frequency (VLF) electromagnetic signal, treat signal stabilization after, locking frequency or survey frequency manually is set.Enter the GPS pattern, determine to measure starting point, according to measuring design, set up survey line grid (can finish indoor in advance) then
Measure: measuring starting point, hand-held instrument also makes the instrument level, and body erect is that axle horizontal rotates instrument then with the health, and when hearing the instrument buzzing, horizontal survey finishes, and promptly measures the horizontal component of electromagnetic induction signal; Keep health motionless, hand-held instrument upwards makes instrument vertical, and arm is motionless, is that axle is moving with the wrist, rotates palm, hears the instrument buzzing, measures and finishes, and promptly measures the vertical component of electromagnetic induction signal.Switch to guided mode, press display module 301, promptly display screen prompting direction moves ahead, and hears that measuring point arrives prompting, stops, and switches to measurement pattern and begins next measuring point measurement, and so circulation is finished up to this survey line, then measures next survey line.Can from display module 301, check measurement result at any time in the measuring process.
Measure to finish, by host communication interface 302 with data transmission to host computer, also can data be saved on the external memory storage by outside extension storage interface 203.Host communication interface 302 can be the RS232 interface; Outside extension storage interface 203 can be the usb interface.
Claims (10)
1. locate very low frequency electromagnetical receiver automatically for one kind, comprise electromagnetic induction signal receiving element, signal processing unit and output unit, it is characterized in that also comprising GPS directed element and electronics directed element, GPS directed element, electronics directed element and electromagnetic induction signal receiving element are connected signal processing unit respectively, gps signal, direction signal and electromagnetic induction signal are transferred to signal processing unit, and signal processing unit connects output unit and transmits data to be exported to output unit.
2. automatic location as claimed in claim 1 very low frequency electromagnetical receiver, it is characterized in that, described electromagnetic induction signal receiving element comprises receiving antenna and very low frequency (VLF) wave band receiver module, receiving antenna inductive electromagnetic signal also is transferred to very low frequency (VLF) wave band receiver module with signal, the amplitude of very low frequency (VLF) wave band receiver module output electromagnetic signal.
3. automatic location as claimed in claim 1 very low frequency electromagnetical receiver is characterized in that described electromagnetic induction signal receiving element also comprises the phase-locked loop circuit that is used for stable electrical magnetic signal frequency, and phase-locked loop circuit is connected with very low frequency (VLF) wave band receiver module.
4. automatic location as claimed in claim 1 very low frequency electromagnetical receiver is characterized in that described electromagnetic induction signal receiving element also comprises the measurement of dip angle module that is used to measure magnetic dip.
5. automatic location as claimed in claim 1 very low frequency electromagnetical receiver, it is characterized in that, described very low frequency (VLF) wave band receiver module comprises a wave filter, a frequency mixer, DDS frequency generation module, AGC automatic gain control circuit, intermediate frequency amplifier circuit, detecting circuit and filtering circuit, the input end that is used for the electromagnetic induction signal filter filtering is connected with the output terminal of receiving antenna, and output terminal connects frequency mixer; DDS frequency generation module output terminal is connected with frequency mixer; The electromagnetic induction signal of wave filter input is connected the intermediate frequency amplifier circuit that is used for the intermediate-freuqncy signal amplification with the output terminal that the signal that DDS frequency generation module produces is formed the frequency mixer of harmonic ringing, intermediate frequency amplifier circuit is connected with filtering circuit successively with detecting circuit, the amplitude of filtering circuit output electromagnetic induction signal; The input end of AGC automatic gain control circuit is connected with the output terminal of detecting circuit, and output terminal is connected with intermediate frequency amplifier circuit.
6. automatic location as claimed in claim 1 very low frequency electromagnetical receiver is characterized in that, described receiving antenna is for receiving the magnetic rod antenna of 15-25KHz wave band.
7. automatic location as claimed in claim 6 very low frequency electromagnetical receiver, it is characterized in that described magnetic rod antenna comprises bar magnet, aerial coil, lead-in wire and radome, aerial coil is on bar magnet, lead-in wire is connected the aerial coil two ends, and radome is enclosed within outside the aerial coil.
8. automatic location according to claim 1 very low frequency electromagnetical receiver is characterized in that, described signal processing unit comprises the main control module that is used for data processing and control and be used for the internal storage of data storage that internal storage is connected with the main control module; Described output unit comprises display module and host communication interface, and display module is connected with the main control module respectively with the host communication interface.
9. automatic location according to claim 1 very low frequency electromagnetical receiver is characterized in that described GPS directed element is the D-GPS global positioning receiver.
10. automatic location according to claim 1 very low frequency electromagnetical receiver is characterized in that described electronics directed element is the electronics bearing compass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201314972U CN202093185U (en) | 2011-04-29 | 2011-04-29 | Automatic positioning very-low-frequency electromagnetic instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201314972U CN202093185U (en) | 2011-04-29 | 2011-04-29 | Automatic positioning very-low-frequency electromagnetic instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202093185U true CN202093185U (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011201314972U Expired - Fee Related CN202093185U (en) | 2011-04-29 | 2011-04-29 | Automatic positioning very-low-frequency electromagnetic instrument |
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|---|---|
| CN (1) | CN202093185U (en) |
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2011
- 2011-04-29 CN CN2011201314972U patent/CN202093185U/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111228 Termination date: 20130429 |