CN105649624B - A kind of girdle Coal-Rock Interface Recognition device based on ultra wide band chaotic radar - Google Patents
A kind of girdle Coal-Rock Interface Recognition device based on ultra wide band chaotic radar Download PDFInfo
- Publication number
- CN105649624B CN105649624B CN201610129546.6A CN201610129546A CN105649624B CN 105649624 B CN105649624 B CN 105649624B CN 201610129546 A CN201610129546 A CN 201610129546A CN 105649624 B CN105649624 B CN 105649624B
- Authority
- CN
- China
- Prior art keywords
- output end
- bandpass filter
- wide band
- ultra wide
- coal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/24—Remote control specially adapted for machines for slitting or completely freeing the mineral
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C39/00—Devices for testing in situ the hardness or other properties of minerals, e.g. for giving information as to the selection of suitable mining tools
Abstract
The Coal-Rock Interface Recognition technology in adopting, specifically a kind of girdle Coal-Rock Interface Recognition device based on ultra wide band chaotic radar are melted the present invention relates to thin coal seam unmanned.The present invention solves the problems, such as that the existing Coal-Rock Interface Recognition device scope of application is limited, safety in utilization is poor, measurement accuracy is low, resolution ratio is low, poor anti jamming capability, Electro Magnetic Compatibility difference.A kind of girdle Coal-Rock Interface Recognition device based on ultra wide band chaotic radar, including emitter, dual-mode antenna, two-channel receiver, data acquisition module, signal processing module, communication module, intrinsic safety electric source；The emitter includes ultra wide band chaotic signal generator, the first bandpass filter, the first power splitter, power amplifier；The dual-mode antenna includes transmitting antenna, reception antenna；The two-channel receiver includes the second bandpass filter, the 3rd bandpass filter, low noise amplifier, IQ demodulators, local oscillation signal generator.The present invention melts suitable for thin coal seam unmanned to adopt.
Description
Technical field
The Coal-Rock Interface Recognition technology in adopting is melted the present invention relates to thin coal seam unmanned, is specifically that one kind is mixed based on ultra wide band
The girdle Coal-Rock Interface Recognition device of ignorant radar.
Background technology
In recent years, with the continuous exhaustion of mine medium-thickness seam, girdle（Thickness is less than 1.3m coal seam）It is increasingly becoming
Main mining coal seam.In thin seam mining, because mining height is small, top plate is low, if fully relying on man-made recovery, production efficiency be present
Low, the problem of labor intensity is high, security incident is more.Therefore, in order to improve production efficiency, reduce labor intensity, reduce safe thing
Therefore it is imperative that unmanned exploitation is carried out in thin seam mining.One of key technology in adopting is melted as thin coal seam unmanned,
Coal-Rock Interface Recognition technology can make preservation degree of crook of the coal-winning machine according to coal seam during traveling automatically adjust roller height
Degree, the rate of extraction is thus improved, ash content and sulfur content is reduced, reduces cutting roof and floor rock to reduce spoil content, improve coal cutting
Speed, vibration that rock induces is reduced to reduce maintenance of machine etc..Under prior art conditions, Coal-Rock Interface Recognition device master
It is divided into three classes：The first kind is natural gamma ray sensor, and the second class is the coal based on characteristics such as cutting force, vibration, temperature
Rock interface identification device, the 3rd class are the radar type Coal-Rock Interface Recognition devices based on coal petrography propagation properties.Put into practice table
Bright, existing Coal-Rock Interface Recognition device is by self structure and principle are limited, and there are the following problems：First, natural gamma ray
Sensor requirements roof and floor country rock must have radioactive element, therefore thus it exists for the adaptability extreme difference of sandstone top plate
The problem of scope of application is limited.Second, the Coal-Rock Interface Recognition device based on characteristics such as cutting force, vibration, temperature belongs to connect
Touch identification device（Only it can just be reacted when coal-winning machine cuts rock）, therefore it is easily fiery caused by rock because cutting
Spend and trigger the serious accidents such as blast, the problem of safety in utilization difference thus be present.Third, it is based on coal petrography propagation properties
Radar type Coal-Rock Interface Recognition device exist measurement accuracy is low, resolution ratio is low, poor anti jamming capability, Electro Magnetic Compatibility difference ask
Topic, therefore it can not meet that thin coal seam unmanned melts the requirement adopted.Based on this, it is necessary to invent a kind of brand-new coal-rock interface and know
Other device, to solve above mentioned problem existing for existing Coal-Rock Interface Recognition device.
The content of the invention
The existing Coal-Rock Interface Recognition device scope of application is limited, safety in utilization is poor, measurement accuracy in order to solve by the present invention
Low, the problem of resolution ratio is low, poor anti jamming capability, Electro Magnetic Compatibility difference, there is provided a kind of based on the thin of ultra wide band chaotic radar
Coal seam Coal-Rock Interface Recognition device.
The present invention adopts the following technical scheme that realization：A kind of girdle coal-rock interface based on ultra wide band chaotic radar
Identification device, including emitter, dual-mode antenna, two-channel receiver, data acquisition module, signal processing module, communication module,
Intrinsic safety electric source；
The emitter includes ultra wide band chaotic signal generator, the first bandpass filter, the first power splitter, power amplification
Device；
The dual-mode antenna includes transmitting antenna a, reception antenna b；
The two-channel receiver includes the second bandpass filter, the 3rd bandpass filter, low noise amplifier, IQ demodulation
Device, local oscillation signal generator；
Wherein, the output end of ultra wide band chaotic signal generator is connected with the input of the first bandpass filter；First band
The output end of bandpass filter is connected with the input of the first power splitter；Two output ends of the first power splitter respectively with power amplification
The input of the input of device and the second bandpass filter connects；The output end of power amplifier and transmitting antenna a input
Connection；The output end of second bandpass filter and the input of data acquisition module connect；
Reception antenna b output end is connected with the input of the 3rd bandpass filter；The output end of 3rd bandpass filter
It is connected with the input of low noise amplifier；The output end of low noise amplifier and the output end of local oscillation signal generator demodulate with IQ
The input connection of device；The output end of IQ demodulators and the input of data acquisition module connect；
The output end of data acquisition module and the input of signal processing module connect；The output end of signal processing module with
The input connection of communication module；
The energization input of ultra wide band chaotic signal generator, the energization input of IQ demodulators, data acquisition module
Energization input, the energization input of signal processing module are connected with the power supply output end of intrinsic safety electric source.
During work, it is bolted and installs one of the present invention one respectively in the top and bottom of coal-winning machine fuselage
Girdle Coal-Rock Interface Recognition device of the kind based on ultra wide band chaotic radar, and the output end of communication module is passed through into coaxial cable
It is connected with the input of coal mining machine controller, as shown in Figure 1, Figure 3.Specific work process is as follows：With the traveling of coal-winning machine, surpass
Chaotic Wideband Signal generator produces ultra wide band chaotic FM signal.The ultra wide band chaotic FM signal enters the first bandpass filtering
Device, and enter the first power splitter after the first bandpass filter is filtered, then it is divided into two-way through the first power splitter：The first via
Ingoing power amplifier, and enter transmitting antenna after power amplifier is amplified, then emitted antenna is launched to coal seam
（The thickness of mining coal seam is treated for detecting）, and reflected through coal-rock interface and produce echo-signal.The echo-signal is connect by reception antenna
Enter the 3rd bandpass filter after receipts, and be filtered, put through the 3rd bandpass filter, low noise amplifier, IQ demodulators successively
Greatly, data acquisition module is entered after IQ demodulation.Second tunnel enters data acquisition module after the second bandpass filter is filtered.
Two-way ultra wide band chaotic FM signal enters signal processing module after data acquisition module is sampled, and through signal transacting mould
Block is handled（Including time domain cross-correlation process of pulse-compression, clutter reduction processing etc.）Coal seam thickness information is obtained afterwards, thus
Realize the Coal-Rock Interface Recognition of roof and bottom plate.The coal seam thickness information sends to coal-winning machine through communication module and controlled
Device, coal mining machine controller can automatically adjust the roller height of coal-winning machine according to the coal seam thickness information.
Based on said process, compared with existing Coal-Rock Interface Recognition device, one kind of the present invention is mixed based on ultra wide band
The girdle Coal-Rock Interface Recognition device of ignorant radar is on the one hand simultaneous using ultra wide band chaotic FM signal strong antijamming capability, electromagnetism
The advantages that capacitive is good, measurement accuracy is high, dynamic range is big, on the other hand with reference to time domain cross-correlation pulse compression technique, realize
High-resolution, in real time, automatically identification treat the coal-rock interface of mining coal seam, thus possess following advantage：First, with natural gal
Horse radiation transducers is compared, and the present invention, which is no longer required for roof and floor country rock, must radioactive element, therefore its scope of application is no longer
It is limited.Second, compared with the Coal-Rock Interface Recognition device based on characteristics such as cutting force, vibration, temperature, the invention belongs to non-contact
Formula identification device, therefore its safety in utilization is more preferable.Third, with the radar type coal-rock interface based on coal petrography propagation properties
Identification device is compared, and measurement accuracy of the invention is higher, resolution ratio is higher, antijamming capability is stronger, Electro Magnetic Compatibility is more preferable, because
This its meet thin coal seam unmanned well and melt the requirement adopted.
The present invention is rational in infrastructure, ingenious in design, efficiently solves the existing Coal-Rock Interface Recognition device scope of application and is limited, makes
With the problem of security is poor, measurement accuracy is low, resolution ratio is low, poor anti jamming capability, Electro Magnetic Compatibility difference, suitable for girdle without
People, which melts, to adopt.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the structural representation of the ultra wide band chaotic signal generator of the present invention.
Fig. 3 is the working state schematic representation of the present invention.
In figure：1- ultra wide band chaotic signal generators, the bandpass filters of 2- first, the power splitters of 3- first, 4- power amplifications
Device, 5a- transmitting antennas, 5b- reception antennas, the bandpass filters of 6- second, the bandpass filters of 7- the 3rd, 8- low noise amplifiers, 9-
IQ demodulators, 10- local oscillation signal generators, 11- data acquisition modules, 12- signal processing modules, 13- communication modules, 14- sheets
Pacify power supply, 15- explosion-resistant enclosures, 16- coal mining machine controllers, 21- voltage controlled oscillators, the power splitters of 22- second, the double balanced mixings of 23-
Device, 24- analog-digital converters, 25- time delay integral feedback units, 26- digital analog converters.
Embodiment
A kind of girdle Coal-Rock Interface Recognition device based on ultra wide band chaotic radar, including it is emitter, dual-mode antenna, double
Channel receiver, data acquisition module 11, signal processing module 12, communication module 13, intrinsic safety electric source 14；
The emitter includes ultra wide band chaotic signal generator 1, the first bandpass filter 2, the first power splitter 3, power
Amplifier 4；
The dual-mode antenna includes transmitting antenna 5a, reception antenna 5b；
The two-channel receiver includes the second bandpass filter 6, the 3rd bandpass filter 7, low noise amplifier 8, IQ solutions
Adjust device 9, local oscillation signal generator 10；
Wherein, the output end of ultra wide band chaotic signal generator 1 is connected with the input of the first bandpass filter 2；First
The output end of bandpass filter 2 is connected with the input of the first power splitter 3；Two output ends of the first power splitter 3 respectively with work(
The input of the input of rate amplifier 4 and the second bandpass filter 6 connects；The output end and transmitting antenna of power amplifier 4
5a input connection；The output end of second bandpass filter 6 is connected with the input of data acquisition module 11；
Reception antenna 5b output end is connected with the input of the 3rd bandpass filter 7；The output of 3rd bandpass filter 7
End is connected with the input of low noise amplifier 8；The output end of low noise amplifier 8 and the output end of local oscillation signal generator 10 with
The input connection of IQ demodulators 9；The output end of IQ demodulators 9 is connected with the input of data acquisition module 11；
The output end of data acquisition module 11 is connected with the input of signal processing module 12；Signal processing module 12 it is defeated
Go out end to be connected with the input of communication module 13；
The energization input of ultra wide band chaotic signal generator 1, the energization input of IQ demodulators 9, data acquisition module
11 energization input, the energization input of signal processing module 12 are connected with the power supply output end of intrinsic safety electric source 14.
The ultra wide band chaotic signal generator 1 includes voltage controlled oscillator 21, the second power splitter 22, double balanced mixer
23rd, analog-digital converter 24, time delay integral feedback unit 25, digital analog converter 26；Wherein, the output end conduct of voltage controlled oscillator 21
The output end of ultra wide band chaotic signal generator 1, and the output end of voltage controlled oscillator 21 and the input of the second power splitter 22 connect
Connect；Two output ends of the second power splitter 22 pass through the coaxial cable and the two of double balanced mixer 23 of two different lengths respectively
Individual input connection；The output end of double balanced mixer 23 is connected with the input of analog-digital converter 24；Analog-digital converter 24
Output end is connected with the input of time delay integral feedback unit 25；The output end and digital analog converter of time delay integral feedback unit 25
26 input connection；The output end of digital analog converter 26 is connected with the input of voltage controlled oscillator 21.Specific work process is such as
Under：Voltage controlled oscillator produces microwave signal.The microwave signal enters the second power splitter, and is divided into two-way through the second power splitter, and two
Coaxial cable of the road microwave signal through two different lengths transmits and produces certain time delay, subsequently into double balanced mixer,
And it is mixed through double balanced mixer（Thus a homodyne phase discriminator is formed）After produce mixed frequency signal.The mixed frequency signal enters
Analog-digital converter, and carry out analog-to-digital conversion, time delay product through analog-digital converter, time delay integral feedback unit, digital analog converter successively
Divide, feed back to voltage controlled oscillator after digital-to-analogue conversion so that voltage controlled oscillator produces ultra wide band chaotic FM signal.
Also include explosion-resistant enclosure 15；It is emitter, two-channel receiver, data acquisition module 11, signal processing module 12, logical
Letter module 13, intrinsic safety electric source 14 are packaged in the inner chamber of explosion-resistant enclosure 15；Dual-mode antenna is installed on the outer bottom of explosion-resistant enclosure 15.
When it is implemented, analog-digital converter 24 uses 8 analog-digital converters.Time delay integral feedback unit 25 uses FPGA
（Altera CycloneII）Realize.Digital analog converter 26 uses TI DAC900 type digital analog converters.
Claims (2)
- A kind of 1. girdle Coal-Rock Interface Recognition device based on ultra wide band chaotic radar, it is characterised in that：Including emitter, receive Send out antenna, two-channel receiver, data acquisition module（11）, signal processing module（12）, communication module（13）, intrinsic safety electric source （14）；The emitter includes ultra wide band chaotic signal generator（1）, the first bandpass filter（2）, the first power splitter（3）, work( Rate amplifier（4）；The dual-mode antenna includes transmitting antenna（5a）, reception antenna（5b）；The two-channel receiver includes the second bandpass filter（6）, the 3rd bandpass filter（7）, low noise amplifier（8）、IQ Demodulator（9）, local oscillation signal generator（10）；Wherein, ultra wide band chaotic signal generator（1）Output end and the first bandpass filter（2）Input connection；First Bandpass filter（2）Output end and the first power splitter（3）Input connection；First power splitter（3）Two output ends point Not and power amplifier（4）Input and the second bandpass filter（6）Input connection；Power amplifier（4）Output End and transmitting antenna（5a）Input connection；Second bandpass filter（6）Output end and data acquisition module（11）It is defeated Enter end connection；Reception antenna（5b）Output end and the 3rd bandpass filter（7）Input connection；3rd bandpass filter（7）It is defeated Go out end and low noise amplifier（8）Input connection；Low noise amplifier（8）Output end and local oscillation signal generator（10）It is defeated Go out end with IQ demodulators（9）Input connection；IQ demodulators（9）Output end and data acquisition module（11）Input Connection；Data acquisition module（11）Output end and signal processing module（12）Input connection；Signal processing module（12）'s Output end and communication module（13）Input connection；Ultra wide band chaotic signal generator（1）Energization input, IQ demodulators（9）Energization input, data acquisition module （11）Energization input, signal processing module（12）Energization input and intrinsic safety electric source（14）Power supply output end connect Connect；The ultra wide band chaotic signal generator（1）Including voltage controlled oscillator（21）, the second power splitter（22）, double balanced mixer （23）, analog-digital converter（24）, time delay integral feedback unit（25）, digital analog converter（26）；Wherein, voltage controlled oscillator（21）'s Output end is as ultra wide band chaotic signal generator（1）Output end, and voltage controlled oscillator（21）Output end and the second work(point Device（22）Input connection；Second power splitter（22）Two output ends respectively by the coaxial cables of two different lengths with Double balanced mixer（23）Two inputs connection；Double balanced mixer（23）Output end and analog-digital converter（24）It is defeated Enter end connection；Analog-digital converter（24）Output end and time delay integral feedback unit（25）Input connection；Time delay integration is anti- Present unit（25）Output end and digital analog converter（26）Input connection；Digital analog converter（26）Output end shaken with voltage-controlled Swing device（21）Input connection.
- 2. a kind of girdle Coal-Rock Interface Recognition device based on ultra wide band chaotic radar according to claim 1, it is special Sign is：Also include explosion-resistant enclosure（15）；Emitter, two-channel receiver, data acquisition module（11）, signal processing module （12）, communication module（13）, intrinsic safety electric source（14）It is packaged in explosion-resistant enclosure（15）Inner chamber；Dual-mode antenna is installed on explosion-proof outer Shell（15）Outer bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610129546.6A CN105649624B (en) | 2016-03-08 | 2016-03-08 | A kind of girdle Coal-Rock Interface Recognition device based on ultra wide band chaotic radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610129546.6A CN105649624B (en) | 2016-03-08 | 2016-03-08 | A kind of girdle Coal-Rock Interface Recognition device based on ultra wide band chaotic radar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105649624A CN105649624A (en) | 2016-06-08 |
| CN105649624B true CN105649624B (en) | 2017-12-08 |
Family
ID=56493280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610129546.6A Active CN105649624B (en) | 2016-03-08 | 2016-03-08 | A kind of girdle Coal-Rock Interface Recognition device based on ultra wide band chaotic radar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105649624B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026111A (en) * | 2017-06-09 | 2018-12-18 | 华安奥特（北京）科技股份有限公司 | A kind of coal mining control system, coal mining system and hydraulic support |
| CN107300720B (en) * | 2017-06-20 | 2019-02-05 | 太原理工大学 | Underground non-metal line detector and method based on polarization chaotic radar |
| CN108119139B (en) * | 2017-11-20 | 2020-06-23 | 中国神华能源股份有限公司 | Coal mining control system, coal mining system and hydraulic support |
| CN109725305A (en) * | 2019-01-02 | 2019-05-07 | 公安部第一研究所 | A kind of ultra wideband radar system of Low Power High Performance |
| CN109814159A (en) * | 2019-01-31 | 2019-05-28 | 中国矿业大学 | The thick top coal detecting thickness device of spy based on ultra-narrow pulse ultra-wideband radar technology |
| CN109814158B (en) * | 2019-01-31 | 2021-02-23 | 中国矿业大学 | Method for judging top coal structure in fully mechanized caving mining of ultra-thick coal seam containing gangue |
| CN111337883B (en) * | 2020-04-17 | 2022-02-08 | 中国矿业大学(北京) | Intelligent detection and identification system and method for mine coal rock interface |
| CN112879003A (en) * | 2021-01-18 | 2021-06-01 | 中国矿业大学 | Intelligent coal rock identification cutting mechanism and method based on stress and electromagnetic wave signals |
| CN113137230B (en) * | 2021-05-20 | 2023-08-22 | 太原理工大学 | Coal-rock interface recognition system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4297699A (en) * | 1979-10-24 | 1981-10-27 | Ensco, Inc. | Radar drill guidance system |
| US6778127B2 (en) * | 2001-03-28 | 2004-08-17 | Larry G. Stolarczyk | Drillstring radar |
| US7656342B2 (en) * | 2006-10-23 | 2010-02-02 | Stolar, Inc. | Double-sideband suppressed-carrier radar to null near-field reflections from a first interface between media layers |
| CN104481534A (en) * | 2014-11-06 | 2015-04-01 | 中国矿业大学 | Coal-cutter roller automatic height-adjusting system |
| CN104989401A (en) * | 2015-05-29 | 2015-10-21 | 中国矿业大学 | Sound based coal-rock interface recognition device and recognition method |
| CN106194181A (en) * | 2016-08-08 | 2016-12-07 | 西安科技大学 | Intelligent work surface coal-rock interface identification method based on geologic data |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010132927A1 (en) * | 2009-05-20 | 2010-11-25 | Geomole Pty Ltd | Forward looking borehole radar to determine proximity of adjacent interface of different seams or layers |
-
2016
- 2016-03-08 CN CN201610129546.6A patent/CN105649624B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4297699A (en) * | 1979-10-24 | 1981-10-27 | Ensco, Inc. | Radar drill guidance system |
| US6778127B2 (en) * | 2001-03-28 | 2004-08-17 | Larry G. Stolarczyk | Drillstring radar |
| US7656342B2 (en) * | 2006-10-23 | 2010-02-02 | Stolar, Inc. | Double-sideband suppressed-carrier radar to null near-field reflections from a first interface between media layers |
| CN104481534A (en) * | 2014-11-06 | 2015-04-01 | 中国矿业大学 | Coal-cutter roller automatic height-adjusting system |
| CN104989401A (en) * | 2015-05-29 | 2015-10-21 | 中国矿业大学 | Sound based coal-rock interface recognition device and recognition method |
| CN106194181A (en) * | 2016-08-08 | 2016-12-07 | 西安科技大学 | Intelligent work surface coal-rock interface identification method based on geologic data |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105649624A (en) | 2016-06-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105649624B (en) | A kind of girdle Coal-Rock Interface Recognition device based on ultra wide band chaotic radar | |
| CN107676095A (en) | High seam top coal caving device and method | |
| CN106226741B (en) | The method and system of intermediate frequency controllable signal is obtained using TR components | |
| GB1378689A (en) | Vehicle monitoring systems | |
| CN203310994U (en) | Millimeter wave automobile anti-collision radar device | |
| CN104930930A (en) | Millimeter wave band fuse and control integrated transmitting-receiving front end | |
| CN101950021A (en) | No-blind area automobile anticollision radar device with joint measurement of ultrasonic waves and millimeter waves | |
| CN102540262B (en) | Nonlinear node detector | |
| CN205003282U (en) | Digital UHF doppler radar device | |
| CN202906898U (en) | C-wave band transmit-receive assembly | |
| CN110824437A (en) | High-frequency ground wave radar simultaneous multi-frequency networking MIMO all-digital receiver | |
| CN203981902U (en) | A kind of Radio Penetration transmitter and the saturating instrument in hole that comprises this transmitter | |
| CN202305833U (en) | Detection circuit for dangerous liquid | |
| CN201867494U (en) | No-blind area automotive anti-collision radar device for joint measuring with ultrasonic waves and millimeter waves | |
| GB684949A (en) | Radio remote control systems | |
| CN204613393U (en) | Millimeter wave transceiving front-end module | |
| CN101344493A (en) | Transmitting/receiving device for breeze concentration microwave measurement system of power station boiler | |
| CN101115040A (en) | Demodulator for CTCS normal point type answering machine | |
| ES182242A1 (en) | A BROADCASTING SYSTEM | |
| CN103427867B (en) | Shortwave based on industry ethernet transmitting-receiving integrated radio modules | |
| CN109814159A (en) | The thick top coal detecting thickness device of spy based on ultra-narrow pulse ultra-wideband radar technology | |
| CN206892327U (en) | Ground penetrating radar system based on horn antenna | |
| CN201167311Y (en) | Apparatus for sending tunnel signal | |
| CN203492163U (en) | Wireless communication system in underground mine | |
| CN203827337U (en) | High penetrability communication control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |