CN204465520U - A kind of wireless through the earth communication optimal frequency choice device - Google Patents
A kind of wireless through the earth communication optimal frequency choice device Download PDFInfo
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- CN204465520U CN204465520U CN201520128695.1U CN201520128695U CN204465520U CN 204465520 U CN204465520 U CN 204465520U CN 201520128695 U CN201520128695 U CN 201520128695U CN 204465520 U CN204465520 U CN 204465520U
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Abstract
The utility model discloses a kind of wireless through the earth communication optimal frequency choice device.Comprise: signal generator, the goods carrying device of replaceable medium, signal receiver, underground medium dielectric constant for different physico-chemical properties, different depth there are differences, radio-frequency (RF) signal strength decay in wireless through the earth communication is caused to there is the problem of larger difference, can be that wireless through the earth communication selects the strongest corresponding radio frequency operation frequency of output signal, ensure the life security of underground job personnel to provide to select better and more accurately the emergency communication device of optimal frequency.
Description
Technical field
The utility model relates to wireless through the earth communication field, particularly relates to a kind of wireless through the earth communication optimal frequency choice device.Ensure the life security of underground job personnel to provide to select better and more accurately the emergency communication device of optimal frequency.
Background technology
Common underground job environment, such as, in the construction of underground mine, underground rail, underground power station etc. and operation maintenance process, in order to ensure the personal safety of underground activities personnel, communication unimpeded in real time and personnel positioning is kept to be even more important, and technology the most frequently used here surely belongs to wire communication, because it has the high communication quality, lays the advantages such as cheap and easy use, but is sometimes still difficult to the extreme condition meeting underground operational environment.Wired communication system depends on the connection of cable, makes them present obvious shortcoming in the following areas:
(1) when a disaster occurs, wire communication, due to broken cable, produces the fault of interrupt communication;
(2) the small deficiency of wired communication system design and development personnel deisgn product, may produce spark or flame, this potential hazard that underground can be caused to contain methane gas light;
(3) can not in the communication of foundation Anywhere of underground job, and only available in the place of cable laying;
(4) capacity of cable telephony system and confidentiality not enough, and can not be the deficiency of telephone with mobile personnel communication.
For this reason, the specific demand for underground job environment creates radio communication service.Wireless communication system can not fall or mechanical damage and cause communication disruption due to underground ceiling, can accomplish the wireless and real-time link of all standing of underground environment.Underground wireless communication comprises again the multiple communication technology, typically there are through the earth communication, MF communication etc., play the emergency warning information (one-way communication) of transmission underground job personnel respectively and the function of voice-and-data business (two-way communication) is provided.The utility model launches explanation mainly for wireless through the earth communication.
The principle of saturating ground wireless communication system is: this type systematic comprises a low-frequency transmitter, produces an electromagnetic signal, can cover completely under without transponder condition and mostly descend working space.This system is made up of two parts, transmitter with one for the ground system detected with communicate.Transmitter can be carried on the waistband of underground job personnel, and it is powered by the head lamp battery of underground job employee or independent battery.Transmitter as radio beacon, under helping rescue personnel to be on the ground positioned to fall ceiling, barrier or below or other people are not easily close to local stranded employee.The compact loop aerial being carried or be arranged at underground job strategic location by underground activities personnel is used for generating an electromagnetic field, and this electromagnetic field can be responded to by ground moving receiver.On the ground, sensitive receiver detects the signal sent, and the position of positioning signal source.Once make detection and positioning, on stranded absence from work without reason, dispose a large-scale ground transmitter.Transmitter should have enough large power, is enough to launch radio voice signal, direct penetrated surface.In case of emergency, his voice transmitter is connected on the loop aerial disposed by underground job personnel, and transmitter is with the electric current supply antenna of low-frequency range.
But there are the following problems for current through the earth communication:
(1) radio wave is in through the earth communication, can through the medium of underground, and electromagnetic wave will present dispersion, absorption and scattering.Component difference and the complicated structure of different medium make radio propagation complicate further.The medium that different undergrounds penetrates environment is very large on electromagnetic impact, for coal medium, anthracitic dielectric constant is 3.2, bituminous coal is 2.8, coal dust is 2.5, moisture be 15% coal be 4.0, it is reported, the conductivity of coal depends on the physicochemical properties of coal, can change at 10-8 ~ 0.02S/m.
(2) general wireless ground through communication system maintains the last of underground job employee life to ensure together, so for different underground media, the radio frequency operation frequency designing a kind of Received signal strength of optimum the strongest is of crucial importance, and does not domesticly at present occur general frequency selective device in this field.
Utility model content
The utility model is intended at least solve the technical problem existed in prior art, especially innovatively proposes the system of selection of a kind of wireless through the earth communication optimal frequency.
In order to realize above-mentioned purpose of the present utility model, the utility model provides a kind of wireless through the earth communication optimal frequency choice device, and its key is, comprising: signal generator, the goods carrying device of replaceable medium, signal receiver,
Signal generator signal output part connects directional transmissions loop antenna signal incoming end, the goods carrying device of replaceable medium loads medium, described directional transmissions loop antenna transmit through the goods carrying device of described replaceable medium, signal receiver signal receiving end is connected with directional reception loop antenna signal receiving end, described directional reception loop antenna signal receiving end receives the signal through the goods carrying device of described replaceable medium, and signal receiver obtains frequency and the amplitude of signal.
The beneficial effect of technique scheme is: this utility model device, can be that wireless through the earth communication selects the strongest corresponding radio frequency operation frequency of output signal, ensure the life security of underground job personnel to provide to select better and more accurately the emergency communication device of optimal frequency.
Described wireless through the earth communication optimal frequency choice device, preferably, also comprises oscilloscope, and described waveform signal input part connects directional reception loop antenna signal output part.
The beneficial effect of technique scheme is: convenient and swift acquisition can penetrate the waveform of signal by oscilloscope.
Described wireless through the earth communication optimal frequency choice device, preferably, also comprises spectrum analyzer, and described spectrum analyzer spectrum signal input connects directional reception loop antenna signal output part.
The beneficial effect of technique scheme is: can obtain the spectral frequencies penetrating signal fast by spectrum analyzer.
Described wireless through the earth communication optimal frequency choice device, preferably, described signal generator product model is the N5182B MXG X train of radio frequency vector signal generator of Agilent.
The beneficial effect of technique scheme is: the transmitting radio frequency vector signal that this preferred N5182B MXG X train of radio frequency vector signal generator can be stable.
Described wireless through the earth communication optimal frequency choice device, preferably, described signal receiver comprises: directional receiving antenna, oscilloscope and frequency spectrograph, and wherein oscilloscope adopts the DSO1052B oscilloscope of Agilent, and frequency spectrograph adopts the E4411B-BAS ESA-L spectrum analyzer of Agilent.
The beneficial effect of technique scheme is: described preferred oscilloscope and spectrum analyzer, working stability, collection signal is accurate.
In sum, owing to have employed technique scheme, the beneficial effects of the utility model are:
The utility model is a kind of universal frequency selective device, can be that wireless through the earth communication selects the strongest corresponding radio frequency operation frequency of output signal, ensures the life security of underground job personnel to provide to select better and more accurately the emergency communication device of optimal frequency.
Additional aspect of the present utility model and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present utility model and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the utility model wireless through the earth communication optimal frequency choice device schematic diagram;
Fig. 2 is received signal strength after the utility model specific embodiment two kinds of coal cinder samples are tested and frequency curve chart.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.
In description of the present utility model, it will be appreciated that, term " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.
In description of the present utility model, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
As shown in Figure 1, the utility model provides a kind of wireless through the earth communication optimal frequency choice device, and its key is, comprising: signal generator, the goods carrying device of replaceable medium, signal receiver,
Signal generator signal output part connects directional transmissions loop antenna signal incoming end, the different radio frequency signal of fixed amplitude is produced by standard signal generator, be transported to the height of coupling " Q " directional transmissions loop antenna, the goods carrying device of replaceable medium loads medium, described directional transmissions loop antenna transmit through the goods carrying device of described replaceable medium, signal receiver signal receiving end is connected with directional reception loop antenna signal receiving end, described directional reception loop antenna signal receiving end receives the signal through the goods carrying device of described replaceable medium, signal receiver obtains frequency and the amplitude of signal.
The beneficial effect of technique scheme is: this utility model device, can be that wireless through the earth communication selects the strongest corresponding radio frequency operation frequency of output signal, ensure the life security of underground job personnel to provide to select better and more accurately the emergency communication device of optimal frequency.
Described wireless through the earth communication optimal frequency choice device, preferably, also comprises oscilloscope, and described waveform signal input part connects directional reception loop antenna signal output part.
The beneficial effect of technique scheme is: convenient and swift acquisition can penetrate the waveform of signal by oscilloscope.
Described wireless through the earth communication optimal frequency choice device, preferably, also comprises spectrum analyzer, and described spectrum analyzer spectrum signal input connects directional reception loop antenna signal output part.
The beneficial effect of technique scheme is: can obtain the spectral frequencies penetrating signal fast by spectrum analyzer.
Described wireless through the earth communication optimal frequency choice device, preferably, described signal generator product model is the N5182B MXG X train of radio frequency vector signal generator of Agilent.
The beneficial effect of technique scheme is: the transmitting radio frequency vector signal that this preferred N5182B MXG X train of radio frequency vector signal generator can be stable.
Described wireless through the earth communication optimal frequency choice device, preferably, described signal receiver comprises: directional receiving antenna, oscilloscope and frequency spectrograph, and wherein oscilloscope adopts the DSO1052B oscilloscope of Agilent, and frequency spectrograph adopts the E4411B-BAS ESA-L spectrum analyzer of Agilent.
The beneficial effect of technique scheme is: described preferred oscilloscope and spectrum analyzer, working stability, collection signal is accurate.
For determining the field intensity by coal cinder radio wave, as shown in schematic diagram 1.Produced the different radio frequency signal of fixed amplitude by standard radiofrequency generator, be transferred to the directional transmissions loop antenna of coupling.Devise the coupling directional antenna of the height " Q " to different radio frequency ripple.The radiofrequency signal of transmission is by being arranged on the shiny surface being about 15cm distant place coal cinder (being of a size of 1m × 1m × 0.5m) apart from transmitting antenna, be placed on from the same distance of transmitting antenna by one, distance coal cinder opposite side is the ripple of the reception antenna receiving attenuation back court of the compatibility of about 15cm simultaneously.The goods carrying device of replaceable medium carries size accordingly according to the size design of coal cinder.The amplitude of the radiofrequency signal decayed and the field intensity of decaying wave are measured by digital oscilloscope and frequency spectrograph respectively, wherein digital oscilloscope can adopt the DSO1052B oscilloscope (50MHz) of Agilent, and frequency spectrograph can adopt the E4411B-BAS ESA-L spectrum analyzer (9KHz-1.5GHz) of Agilent.
Signal generator is N5182B MXG X train of radio frequency vector signal generator (9KH-3GHz or 6GHz) of Agilent, and signal receiver comprises reception directional antenna, oscilloscope and frequency spectrograph.Record the radio frequency signal attenuation value with tranmitting frequency change.Same experiment is repeated to another coal cinder being of a size of 1m × 1m × 0.5m.
Operation principle is, by computer drawing one, the figure of radio-frequency (RF) signal strength with frequency change is exported to two different locations different material attribute coal cinders by test data of experiment, as shown in Figure 2, wherein the unit of signal strength signal intensity is dBuv, and the conversion computing formula of itself and voltage amplitude is:
Next by SPSS (Statistical Product and Service Solutions) statistical software, curve chart is carried out Function Fitting, obtain the expression of a signal strength signal intensity f (x), wherein, x represents signal frequency, and then by f (x) optimization, obtain optimal frequency.
Suppose that the function expression that Received signal strength frequency-intensity curve matching that all tests obtain by SPSS obtains is f (x)=ax
3+ bx
2+ cx+d, wherein, a, b, c and d are real coefficient.Preferably being suitable for frequency for obtaining signal, mathematically adopting very big, minimum method as described below to estimate.
First derivation is carried out to f (x), and makes f'(x)=3ax
2+ 2bx+c=0, its solution is
If the second dervative of f (x)
namely f (x) is at x=x
1time minimum;
Namely at x=x
2time, f (x) is maximum.
Therefore, for making transceiver obtain maximum transmitting and receiving signal by coal barrier, the frequency of advising is
For the utility model illustrated embodiment, the optimum working frequency calculated for specific coal cinder medium is x=0.457MHz=457KHz.Above-mentioned computational methods are that those skilled in the art use and the technology known usually.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and described embodiment of the present utility model, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present utility model and aim, scope of the present utility model is by claim and equivalents thereof.
Claims (5)
1. a wireless through the earth communication optimal frequency choice device, is characterized in that, comprising: signal generator, the goods carrying device of replaceable medium, signal receiver,
Signal generator signal output part connects directional transmissions loop antenna signal incoming end, the goods carrying device of replaceable medium loads medium, described directional transmissions loop antenna transmit through the goods carrying device of described replaceable medium, signal receiver signal receiving end is connected with directional reception loop antenna signal receiving end, described directional reception loop antenna signal receiving end receives the signal through the goods carrying device of described replaceable medium, and signal receiver obtains frequency and the amplitude of signal.
2. wireless through the earth communication optimal frequency choice device according to claim 1, is characterized in that, also comprise oscilloscope, and described waveform signal input part connects directional reception loop antenna signal output part.
3. wireless through the earth communication optimal frequency choice device according to claim 1, is characterized in that, also comprise spectrum analyzer, and described spectrum analyzer spectrum signal input connects directional reception loop antenna signal output part.
4. wireless through the earth communication optimal frequency choice device according to claim 1, is characterized in that, described signal generator product model is the N5182B MXG X train of radio frequency vector signal generator of Agilent.
5. wireless through the earth communication optimal frequency choice device according to claim 1, it is characterized in that, described signal receiver comprises: directional receiving antenna, oscilloscope and frequency spectrograph, wherein oscilloscope adopts the DSO1052B oscilloscope of Agilent, and frequency spectrograph adopts the E4411B-BAS ESA-L spectrum analyzer of Agilent.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846912A (en) * | 2016-03-16 | 2016-08-10 | 刘儿兀 | Frequency selection optimization system and deep penetration communication method |
| CN115276696A (en) * | 2022-07-15 | 2022-11-01 | 北京信息科技大学 | Orientation apparatus and method for through-the-earth communication |
| CN115529622A (en) * | 2022-09-26 | 2022-12-27 | 北京信息科技大学 | Node equipment selection method and system for electrode through-the-earth communication |
-
2015
- 2015-03-06 CN CN201520128695.1U patent/CN204465520U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846912A (en) * | 2016-03-16 | 2016-08-10 | 刘儿兀 | Frequency selection optimization system and deep penetration communication method |
| CN105846912B (en) * | 2016-03-16 | 2019-06-18 | 刘儿兀 | A kind of optimization frequency selection system and deep penetration communication means |
| CN115276696A (en) * | 2022-07-15 | 2022-11-01 | 北京信息科技大学 | Orientation apparatus and method for through-the-earth communication |
| CN115529622A (en) * | 2022-09-26 | 2022-12-27 | 北京信息科技大学 | Node equipment selection method and system for electrode through-the-earth communication |
| CN115529622B (en) * | 2022-09-26 | 2023-07-14 | 北京信息科技大学 | Node equipment selection method and system for electrode through-the-earth communication |
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