CN110166162A - Hand-held press device - Google Patents
Hand-held press device Download PDFInfo
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- CN110166162A CN110166162A CN201910438860.6A CN201910438860A CN110166162A CN 110166162 A CN110166162 A CN 110166162A CN 201910438860 A CN201910438860 A CN 201910438860A CN 110166162 A CN110166162 A CN 110166162A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K2203/00—Jamming of communication; Countermeasures
- H04K2203/10—Jamming or countermeasure used for a particular application
- H04K2203/22—Jamming or countermeasure used for a particular application for communication related to vehicles
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
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Abstract
Type of the present invention discloses hand-held press device, and interference source module, the radio-frequency module connected with compacting switch, the power module connecting with power switch is arranged in the shell including setting power switch and compacting switch, the enclosure interior；Interference source module includes two-way noise generation unit, and second frequency synthesizer receives white Gaussian noise source signal and CHAOTIC INTERFERENCE noise source signal and synthesizes compacting interference signal；Compacting interference signal is sent to voltage controlled oscillator, voltage controlled oscillator receives compacting interference signal and is amplified by the first power amplifier, it is sent to the filtering processing of third filter amplifier, compacting interference signal after filtering processing is inputted into the second power amplifier, interference signal input logarithm interference antenna progress plus and blowup will be suppressed after amplification to be radiated in the air, effectively to the control of " black to fly " unmanned plane；The shell includes press body, and the press body connects handle, and junction is provided with power switch button and compacting switch button.
Description
Technical field
Type of the present invention belongs to unmanned plane compacting field, is related to hand-held press device.
Background technique
In recent years, unmanned plane market increases swift and violent, with big boundary, extremely fly, zero degree Zhi Kongdeng producer it is extensive research and develop and
Production, so that the great cost performance of civilian (commercialization) unmanned plane, popularity is higher and higher, and UAV system has been widely used
Various industries are greatly enriched the work and daily life of various industries.However, it is domestic to unmanned plane, especially
The supervision of " black to fly ", " disorderly flying " unmanned plane is also in space state.The small-sized, miniature of airflight, nano type unmanned plane are black
Flying and disorderly winged ratio is about 90%, this causes great hidden danger to aerial supervision, air security, rising and falling for aircraft is seriously affected,
Upset public activity, critical infrastructures, government region and the safety of convention.
Summary of the invention
The purpose of type of the present invention is: providing hand-held press device, solves asking for black winged unmanned plane supervision blank
Topic.
Type of the present invention the technical solution adopted is as follows:
Hand-held press device, the shell including setting power switch and compacting switch, the enclosure interior setting interference
Source module, the radio-frequency module connected with compacting switch, the power module being connect with power switch；Wherein, interference source module includes
Two-way noise generation unit: first via noise generation unit includes M sequence generator, M sequence generator generation pseudo-order
Digital signal is simultaneously filtered by FIR filter module；By treated, pseudo-order digital signal is sent to frequency to FIR filter module
Rate synthesizer；It further include single channel DDS module, DDS module generates raw digital signal and is sent to first frequency synthesizer；Institute
The signal that first frequency synthesizer receives FIR filter module and single channel DDS module is stated, digital white noise letter is sent after synthesis
Number to the first D/A conversion module, the first D/A conversion module receives digital white noise signal and is simultaneously converted to simulating the white noise
Signal is sent to the first filter amplifier；First filter amplifier receives simulating the white noise signal and enhanced processing is white Gaussian
Noise source signal is sent to second frequency synthesizer；Second road noise generation unit generates two groups by chaos sequence generator and mixes
Ignorant interference signal；Two groups of CHAOTIC INTERFERENCE signals are all connected with linear quantizer；It is dry that the linear quantizer synthesizes two groups of chaos
It disturbs signal and is sent to the 2nd D/A conversion module, the 2nd D/A conversion module receives two groups of CHAOTIC INTERFERENCE signals after synthesis
And it is converted to simulation interfering noise signal and is sent to the second filter amplifier；Second filter amplifier receives simulation interference noise letter
Number and enhanced processing be CHAOTIC INTERFERENCE noise source signal be sent to second frequency synthesizer；The second frequency synthesizer receives high
This white noise sound-source signal and CHAOTIC INTERFERENCE noise source signal simultaneously synthesize compacting interference signal；Compacting interference signal is sent to voltage-controlled
Oscillator, voltage controlled oscillator receive compacting interference signal and are amplified by the first power amplifier, are sent to third filter and amplification
Device filtering processing, is sent to the second power amplifier for the compacting interference signal after filtering processing, by compacting interference letter after amplification
It number is sent to logarithm interference antenna and carries out plus and blowup and be radiated in the air, effectively to the control of " black winged " unmanned plane.
Provide that Radio Frequency Allocation Regulation of the People's Republic of China, 840.5MHz~845MHz are available according to Ministry of Industry and Information
In the uplink distant control chain circuit of push-button aircraft system.1430MHz~1444MHz frequency range can be used for push-button aircraft
System descending telemetering and information transmission link.2408MHz~2440MHz frequency range can be used as push-button aircraft system uplink
It is remotely controlled, the backup frequency range of downlink telemetry and information transmission link, wherein GPS and BDS satellite positioning signal frequency range L1:1575.42
±1.023MHz,L2:1227.6±10.23MHz,L3:1176.45±12MHz,B1:1561.098±2.046MHz,B2:
1207.6 ±2.046MHz,B3:1268.52±10.23MHz。
The present invention is in order to solve the problems, such as black winged unmanned plane supervision blank；Hand-held press device core host is integration
Design is switched by power switch and compacting, and interference source module automatically controls each road compacting source and power amplifier module, can be simultaneously
Raw 430MHz~440MHz, 2394MHz~2489MHz and 5719MHz~5856MHz be mainly used for remote control and figure communication number into
Row barrage jamming, 1100MHz~1300MHz, 1558MHz~1592MHz be mainly used for GPS and BDS satellite positioning signal into
Row barrage jamming effectively blocks system for flight control computer and signal transmission system, instructs and defend to make it lose to fly to control
Star location information, be allowed to can not normal flight, the pipe for making a return voyage, landing and falling different can be generated according to the design of unmanned plane
Control effect.The also a piece of peacefulness of sky improves the mobility of the supervision of " black to fly " unmanned plane, the low altitude airspace peace in support area
Entirely.
Further, the radio-frequency module includes logarithm interference antenna.
Further, the power module includes power management plate and lithium battery group.
Further, the chaos sequence generator quantity is 6, is divided into two groups and tires out respectively with the first accumulator and second
Add device to connect, generate two groups of CHAOTIC INTERFERENCE signals, so that linearly becoming device exports discrete white Gaussian noise, then passes through the 2nd D/A
Converter obtains continuous white Gaussian noise, and available best chaos suppresses interference noise.
It further, further include the frequency discriminator being connect with frequency source database, the frequency discriminator is also connected with second frequency synthesis
Device.Frequency divider is set between the voltage controlled oscillator and the first power amplifier, and the frequency divider passes through protection circuit connection mirror
Frequency device.
Frequency-modulated wave signal is converted into the frequency-modulated wave that envelope is also changed by former modulated signal rule first by frequency discriminator, then
Modulated signal is detected from frequency-modulated wave, is last transmitted to second frequency synthesizer.
Further, second frequency synthesizer is received into white Gaussian noise source signal and CHAOTIC INTERFERENCE noise source signal and synthesized
To suppress interference signal；Will compacting interference signal be sent to the first power amplifier, third filter, the second power amplifier,
It carries out plus and blowup finally by logarithm interference antenna to be radiated in the air, effectively to the control of " black to fly " unmanned plane.
Further, the shell includes press body, and the press body connects handle, and junction be provided with power switch by
Button and compacting switch button.In use, operator holds handle, articulations digitorum manus can touch two switch buttons, one-handed performance ten
It is convenient to divide.
Further, the shell includes gun barrel, and the gun barrel connects gun body handle, and junction is provided with finger ring hole, institute
State setting compacting switch key in finger ring hole.The gun barrel outer wall setting nameplate places mouth.In use, operator holds gun body
Handle, articulations digitorum manus pass through finger ring hole touching compacting switch key, and one-handed performance is very convenient.And it is directed to the pressure of different model
Control equipment places the nameplate that nameplate is placed on the setting of gun barrel outer wall in mouth.
In conclusion by adopting the above-described technical solution, the invention has the advantage that:
1. hand-held press device, hand-held press device core host is the integrated design, and passes through power switch and pressure
System switch, interference source module automatically control each road compacting source and power amplifier module, can give birth to 430MHz~440MHz simultaneously,
2394MHz~2489MHz and 5719MHz~5856MHz is mainly used for remote control and figure communication number carries out barrage jamming,
1100MHz~1300MHz, 1558MHz~1592MHz are mainly used for GPS and BDS satellite positioning signal and carry out barrage jamming,
It effectively blocks system for flight control computer and signal transmission system, fly control instruction and satellite positioning information to make it lose, make
Can not normal flight, the control effect maked a return voyage, land and fallen different can be generated according to the design of unmanned plane.
2. operator can be with one-handed performance press device, mobility strong, small in size, light-weight in type of the present invention.
3. the effective control distance of type of the present invention: 0 meter~1000 meters (covering entire low latitude open area).
Detailed description of the invention
It, below will be to needed in the embodiment in order to illustrate more clearly of the technical solution of type embodiment of the present invention
Attached drawing is briefly described, it should be understood that the following drawings illustrates only some embodiments of type of the present invention, therefore should not be seen
Work is the restriction to range, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings, in which:
Fig. 1 is flow chart of the present invention；
Fig. 2 is first structure figure of the present invention；
Fig. 3 is the second mechanism map of the invention；
Fig. 4 is the flow chart of radio-frequency module of the present invention.
Marked in the figure: 1- press body, 2- handle, 3- power switch button, 4- suppress switch button, 5- gun barrel, 6- gun body
Handle, 7- suppress switch key, and 8- nameplate places mouth.
Specific embodiment
In order to which the objects, technical solutions and advantages of type of the present invention are more clearly understood, with reference to the accompanying drawings and embodiments,
Type of the present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention
Type is not intended to limit the present invention type, i.e. described embodiment is only type a part of the embodiment of the present invention, rather than complete
The embodiment in portion.The component for the type embodiment of the present invention being usually described and illustrated herein in the accompanying drawings can be with a variety of different
Configuration is to arrange and design.
Therefore, requirement is not intended to limit to the detailed description of the embodiment of the type of the present invention provided in the accompanying drawings below to protect
The range of the type of the present invention of shield, but it is merely representative of the selected embodiment of type of the present invention.Based on the embodiment of type of the present invention, originally
Field technical staff every other embodiment obtained without making creative work, belongs to the present invention
The range of type protection.
It should be noted that the relational terms of term " first " and " second " or the like be used merely to an entity or
Operation is distinguished with another entity or operation, is appointed without necessarily requiring or implying existing between these entities or operation
What this actual relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant be intended to it is non-
It is exclusive to include, so that the process, method, article or equipment for including a series of elements not only includes those elements,
It but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment institute
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
This programme is hand-held press device, the shell including setting power switch and compacting switch, the enclosure interior
Interference source module, the radio-frequency module connected with compacting switch, the power module connecting with power switch are set；Wherein, interference source
Module includes two-way noise generation unit: first via noise generation unit includes M sequence generator, M sequence generator production
Raw pseudo-order digital signal is simultaneously filtered by FIR filter module；FIR filter module will treated pseudo-order digital signal
It is sent to frequency synthesizer；It further include single channel DDS module, DDS module generates raw digital signal and is sent to first frequency conjunction
It grows up to be a useful person；The first frequency synthesizer receives the signal of FIR filter module and single channel DDS module, and it is white that number is sent after synthesis
To the first D/A conversion module, the first D/A conversion module receives digital white noise signal and is converted to simulation noise signal
White noise signal is sent to the first filter amplifier；First filter amplifier receives simulating the white noise signal and enhanced processing is
White Gaussian noise source signal is sent to second frequency synthesizer；Second road noise generation unit is produced by chaos sequence generator
Raw two groups of CHAOTIC INTERFERENCE signals；Two groups of CHAOTIC INTERFERENCE signals are all connected with linear quantizer；The linear quantizer synthesis two
Group CHAOTIC INTERFERENCE signal is sent to the 2nd D/A conversion module, and the 2nd D/A conversion module receives two groups of chaos after synthesis
Interference signal and be converted to simulation interfering noise signal be sent to the second filter amplifier；It is dry that second filter amplifier receives simulation
It disturbs noise signal and enhanced processing is that CHAOTIC INTERFERENCE noise source signal is sent to second frequency synthesizer；The second frequency synthesis
Device receives white Gaussian noise source signal and CHAOTIC INTERFERENCE noise source signal and synthesizes compacting interference signal；Send compacting interference letter
Number arrive voltage controlled oscillator, voltage controlled oscillator receive compacting interference signal simultaneously by the first power amplifier amplify, be sent to third
Compacting interference signal after filtering processing is inputted the second power amplifier, will suppressed after amplification by filter amplifier filtering processing
Interference signal input logarithm interference antenna carries out plus and blowup and is radiated in the air, effectively to the control of " black to fly " unmanned plane.
The radio-frequency module includes logarithm interference antenna.The power module includes power management plate and lithium battery group.Institute
Stating chaos sequence generator quantity is 6, is divided into two groups and connect respectively with the first accumulator and the second accumulator, generates two
Group CHAOTIC INTERFERENCE signal.It further include the frequency discriminator being connect with frequency source database, the frequency discriminator is also connected with second frequency synthesis
Device.Frequency divider is set between the voltage controlled oscillator and the first power amplifier, and the frequency divider passes through protection circuit connection mirror
Frequency device.
It is described in further detail below with reference to feature and performance of Fig. 1-3 embodiment to type of the present invention.
Embodiment one
The hand-held press device that type preferred embodiment of the present invention provides, as shown in Figure 2；Hand-held press device overall length
45CM, 10.7 centimetres of beam overall；Wherein 2 length of handle is 12 centimetres, is to guarantee one-handed performance power switch button 3 in this way
With the convenience of compacting switch button 4；
When work: hand-held press device core host is the integrated design, and is switched by power switch and compacting, interference
Source module automatically controls each road compacting source and power amplifier module, can give birth to 430MHz~440MHz simultaneously, and 2394MHz~
2489MHz and 5719MHz~5856MHz be mainly used for remote control and figure communication number carry out barrage jamming, 1100MHz~
1300MHz, 1558MHz~1592MHz are mainly used for GPS and BDS satellite positioning signal and carry out barrage jamming, effective ground resistance
Disconnected system for flight control computer and signal transmission system fly control instruction and satellite positioning information to make it lose, and being allowed to can not be just
Often flight can generate the control effect maked a return voyage, land and fallen according to the design of unmanned plane is different.The also a piece of peacefulness of sky,
Improve the mobility of the supervision of " black to fly " unmanned plane, the low altitude airspace safety in support area.
Embodiment two
Hand-held press device provided by the invention, as shown in Figure 3；Using pistol-type structure, operator holds gun body handle
Hand 6, articulations digitorum manus pass through finger ring hole touching compacting switch key 7, and one-handed performance is very convenient.The power button of this structure is set
It sets in the position being arbitrarily operable to；Because using when power button be the primary switch of operation；And it is directed to different model
Press device, by nameplate be placed on gun barrel outer wall setting nameplate place mouth in.
When work: as shown in Figure 4, it is contemplated that frequency range 1GHz~20GHz of signal source, it is directly defeated with a phaselocked loop
It is difficult to complete out, so exporting 10GHz~20GHz using a ring, is completed by way of switches switching frequency, it is defeated
Out when 10G~20G, switching gate lead directly to road directly export, export 3-10G when switching gate divide road, variable frequency divider according to
Achievable 1 frequency dividing of different control port varying level combinations, 2 frequency dividings, 4 frequency dividings, 8 frequency dividings, minimum exportable 3000MHz, most
Height output 20GHz, meets the needs of reality output bandwidth.Variable attenuator plays a part of adjusting output power.
Embodiment three
On the basis of embodiment 2, Analysis of Phase Noise is done；According to actual test, HMC704 is in phase demodulation frequency
When 100MHz, make an uproar=- 216+10log10000000=-136dBc/Hz for main ring fractional frequency division mode bottom, exports highest frequency
When 15GHz, phase noise deteriorates multiple N=15000/100=150,20log150=43, -136+43=-93dBc/Hz@
10KHz.It is -70dBc/Hz@10KHz according to its phase noise of VCO handbook, and since phase noise of the loop bandwidth to VCO is in
High pass filter characteristic, in order to reduce VCO phase noise influence, loop bandwidth should take larger, tentatively be thought of as
300KHz, the noise that VCO is introduced at this time is -70-20log30=-98dBc/Hz@10KHz, in addition, by reference signal by thus
It can be extrapolated that the final result that the main two kinds of phase noises of phaselocked loop stack up can achieve -85dBc/Hz@10KHz.
Example IV
On the basis of embodiment 3, do variegation: mainly spuious source has following several phaselocked loop, and reference frequency is let out
Dew, phase demodulation frequency leakage, fractional frequency division is spuious, and power supply is spuious, below come analyze phase demodulation frequency leakage it is spuious, according to
The band spurious of the leakage of phase demodulation frequency described in HMC704 handbook is -52dBc~-60dBc, and using 100MHz phase demodulation, stepping is
When 1MHz.When output frequency is near phase demodulation frequency integral multiple, the spuious 0.25MHz of nearest fractional frequency division, decimal point are had
Desultory point under frequency mode is fallen in loop bandwidth, can not be filtered out, this is worst situation, and spurious reduction is -52dBc or so,
Loop filter inhibits higher to the reference of 100MHz, as long as therefore spuious processing on power supply it is good enough, most not good enough is miscellaneous
Scattered inhibition can achieve -52dBc
Embodiment five
On the basis of embodiment 4, output power analysis is done: according to the PDF of variable frequency divider UXB20P, defeated
When to enter frequency be 10GHz~20GHz, output power when ÷ 1, ÷ 2 is within the scope of -2dBm~0dBm, post-amplifier
The gain of HMC565 is 20dB, and the gain of P-1 12dBm, final amplifier HMC634 are 20dB or so, and output P-1 is
22.7dBm, working frequency are 5G~20G, thus when export 4.5G~15G amplifier pushed away be saturated after output power be
22dBm or so, the total Insertion Loss of final stage switch filter is 8dB, therefore final output power is 14dBm or so, is met the requirements,
When exporting 3G~4.5G not in the operating frequency range of HMC634, therefore HMC788 being chosen, output P-1 is 21dBm, because
This output power is also met the requirements.
Embodiment six
On the basis of embodiment 4, switching time analysis is done；According to above-mentioned measured data, in 100MHz phase demodulation, ring
Road bandwidth takes several hundred KHz, phase-locked loop frequency switching time < 1ms to obtain power consumption analysis table 1:
Table 1
The foregoing is merely the preferred embodiments of type of the present invention, are not intended to limit the invention the protection scope of type,
Anyone skilled in the art type of the present invention spirit and principle within it is made it is any modification, equivalent replacement and
Improve etc., it should be included within the protection scope of type of the present invention.
Claims (9)
1. hand-held press device, it is characterised in that: the shell including setting power switch and compacting switch, the enclosure interior
Interference source module, the radio-frequency module connected with compacting switch, the power module connecting with power switch are set；
Wherein, interference source module includes two-way noise generation unit:
First via noise generation unit includes M sequence generator, M sequence generator generation pseudo-order digital signal and passes through
The filtering processing of FIR filter module；By treated, pseudo-order digital signal is sent to frequency synthesizer to FIR filter module；Also wrap
Single channel DDS module is included, DDS module generates raw digital signal and is sent to first frequency synthesizer；The first frequency synthesis
Device receives the signal of FIR filter module and single channel DDS module, and digital white noise signal is sent after synthesis and is converted to the first D/A
Module, the first D/A conversion module, which receives digital white noise signal and is converted to simulating the white noise signal, is sent to the first filter
Twt amplifier；It is that white Gaussian noise source signal is sent to that first filter amplifier, which receives simulating the white noise signal and enhanced processing,
Two frequency synthesizers；
Second road noise generation unit generates two groups of CHAOTIC INTERFERENCE signals by chaos sequence generator；Two groups of CHAOTIC INTERFERENCEs
Signal is all connected with linear quantizer；The linear quantizer synthesizes two groups of CHAOTIC INTERFERENCE signals and is sent to the 2nd D/A conversion module,
The 2nd D/A conversion module receives two groups of CHAOTIC INTERFERENCE signals after synthesis and is converted to simulation interfering noise signal and is sent to
Second filter amplifier；Second filter amplifier receives simulation interfering noise signal and enhanced processing as CHAOTIC INTERFERENCE noise source letter
Number it is sent to second frequency synthesizer；
The second frequency synthesizer receives white Gaussian noise source signal and CHAOTIC INTERFERENCE noise source signal and synthesizes compressed dry
Disturb signal；Compacting interference signal is sent to voltage controlled oscillator, voltage controlled oscillator receives compacting interference signal and passes through the first power
Amplifier amplification is sent to the filtering processing of third filter amplifier, the compacting interference signal after filtering processing is sent to second
Power amplifier, will after amplification suppress interference signal be sent to logarithm interference antenna carry out plus and blowup be radiated in the air.
2. hand-held press device according to claim 1, it is characterised in that: the radio-frequency module includes logarithm interference day
Line.
3. hand-held press device according to claim 1, it is characterised in that: the power module includes power management plate
And lithium battery group.
4. hand-held press device according to claim 1, it is characterised in that: the chaos sequence generator quantity is 6,
It is divided into two groups to connect with the first accumulator and the second accumulator respectively, generates two groups of CHAOTIC INTERFERENCE signals.
5. hand-held press device according to claim 1, it is characterised in that: further include being connect with frequency source database
Frequency discriminator, the frequency discriminator are also connected with second frequency synthesizer.
6. hand-held press device according to claim 5, it is characterised in that: the voltage controlled oscillator and the first power are put
Frequency divider is set between big device, and the frequency divider passes through protection circuit connection frequency discriminator.
7. hand-held press device according to claim 1, it is characterised in that: the shell includes press body (1), described
Press body (1) connects handle (2), and junction is provided with power switch button (3) and compacting switch button (4).
8. hand-held press device according to claim 1, it is characterised in that: the shell includes gun barrel (5), the rifle
(5) connection gun body handle (6) is managed, and junction is provided with finger ring hole, setting compacting switch key (7) in the finger ring hole.
9. hand-held press device according to claim 8, it is characterised in that: gun barrel (5) the outer wall setting nameplate is put
Set mouth (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910438860.6A CN110166162B (en) | 2019-05-24 | 2019-05-24 | Hand-held pressing equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910438860.6A CN110166162B (en) | 2019-05-24 | 2019-05-24 | Hand-held pressing equipment |
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| CN110166162A true CN110166162A (en) | 2019-08-23 |
| CN110166162B CN110166162B (en) | 2021-09-10 |
Family
ID=67632271
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910438860.6A Active CN110166162B (en) | 2019-05-24 | 2019-05-24 | Hand-held pressing equipment |
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| CN112367142A (en) * | 2020-10-29 | 2021-02-12 | 黄凯 | Interference signal generating device |
| CN117411587A (en) * | 2023-10-30 | 2024-01-16 | 南京新频点电子科技有限公司 | Intelligent enhanced full-frequency-band examination room wireless signal shielding device |
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| CN117411587A (en) * | 2023-10-30 | 2024-01-16 | 南京新频点电子科技有限公司 | Intelligent enhanced full-frequency-band examination room wireless signal shielding device |
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| Publication number | Publication date |
|---|---|
| CN110166162B (en) | 2021-09-10 |
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