CN109004948A - A kind of rotation electret-type machinery antenna LF communication system - Google Patents
A kind of rotation electret-type machinery antenna LF communication system Download PDFInfo
- Publication number
- CN109004948A CN109004948A CN201811009565.0A CN201811009565A CN109004948A CN 109004948 A CN109004948 A CN 109004948A CN 201811009565 A CN201811009565 A CN 201811009565A CN 109004948 A CN109004948 A CN 109004948A
- Authority
- CN
- China
- Prior art keywords
- magnetic field
- electret
- signal
- antenna
- charged
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Near-Field Transmission Systems (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The present invention provides a kind of rotation electret-type machinery antenna LF communication systems, belong to LF communication technical field.System of the invention includes low-frequency magnetic field signal generation module and induced signal receiving module.Low-frequency magnetic field signal generation module includes motor and charged electret in mechanical antenna；It controls the motor in mechanical antenna and generates different rotating speeds, driving charged electret rotation generates the magnetic field signal of different frequency；Required communication signal is loaded on generated magnetic field signal, emits signal to receiving direction using mechanical antenna.Induced signal receiving module receives the magnetic field signal launched by magnetic field sensor, and carries out the communication signal needed for demodulation obtains.The present invention utilizes the characteristics of ultra-low frequency and very low frequency radio wave, the method rotated using motor driven charged electret, it forms low frequency alternating magnetic field and emits magnetic field signal, the antenna length and power consumption of radio transmitter can be greatly lowered, realize stable low frequency wireless communication.
Description
Technical field
The present invention relates to LF communication technical fields, and in particular to the radio transmitting that one kind is realized in a mechanically driving manner
The LF communication system of machine.
Background technique
LF communication technology is the technology carried out wireless communication using super/extremely low wavelength coverage in radio-frequency spectrum.Low frequency
Communication has many advantages compared with the communication of other frequency ranges, mainly there is the following aspects:
Ultra-low frequency signal is propagated using huge " waveguide " between earth surface and ionosphere, and atmospheric attenuation is very small, e.g.,
In 75Hz work, every thousand kilometers of atmospheric attenuations can be such that low frequency signal is transferred to far in 0.9~1.5dB, as long as with one
The transmitter station just can be carried out global communication.While its decaying in the seawater is about 0.3dB/m, therefore it penetrates the depth of seawater
Degree sufficiently achieves the safety depth of submarine submariner.
Low frequency signal is insensitive to insecure propagation conditions, propagates reliable and stable.Ultra-low frequency electromagnetic wave is at the earth's surface
With zero order mode (TEM wave, i.e. transverse) propagation in the spherical waveguide formed with interface under ionosphere.Electromagnetic energy is in waveguide
It is distally propagated in the waveguide under wall guided, the ionosphere as one of wave guide wall is the D layer of stability of characteristics, accordingly even when in electricity
Absciss layer is also able to maintain stable propagation in the case where by natural disturbance even nuclear explosion, is to count seldom several not by electromagnetism
One of the means of communication that pulse destroys.
Anti-interference ability is stronger, any jammer, if attempting to interfere super/ELF communication, it just must have than it is super/
The more powerful power output of very low frequencies communication signal, to also just need bigger super/extremely-low frequency antenna system, such interference
The cost-effectiveness of antenna system is open to suspicion.
Although low frequency communication have so many advantage, LF communication there are still greatest problem be how to realize it is low
Effective generation of frequency electromagnetic waves.
It is mentioned in " China builds up ultralow frequency to deep-water submersible communication system " text, submarine receives signal using antenna buoy
When, antenna buoy keeps being unfolded in 6 to 9m depth under water, and submarine can navigate by water on rice 45 to the depth of 70m under water, but latent
The underwater velocity of ship is restricted, and highest is no more than 4 sections.With the development of antisubmarine technology, antenna is it is possible to be detected.
For Russian, such keel depth cannot be guaranteed concealment when its strategy patrol." long wave is super
Long wave extremely long wave propagation " in a book, Russia is named as the VF hair of " Parameter " in the second half year in 1998 in the original plan
Test is penetrated, transmitting loop antenna diameter is intended to be 300m, and in space, antenna about needs 5 by itself rotary expansion, whole process
~6 hours, the lifetime of satellite was about 33 days.Later due to funds, this scheme delay.It can thus be seen that according to
Conventional approach realizes LF communication, and since the wavelength of ultra-low frequency electromagnetic wave is 1000~10000km, what is set up is ultralow
Frequency antenna be designed to it is tens kilometers long to kilometers up to a hundred, antenna loop area reach tens of or even hundreds of square kilometres, size and power consumption
It is all excessively huge.Transmitting station is in large scale on the bank, and antenna land occupation is wide, up to several, steel tower to tens of seats, and antenna exposure, target
Obviously, wartime survival ability is poor, is easily destroyed and is difficult to repair in short term.
Summary of the invention
The present invention is directed to LF communication with strong antijamming capability, long transmission distance and propagates reliable and stable advantage,
In order to preferably apply LF communication, strategic very-long-range, penetrability communication are realized, to overcome traditional antenna communication mode base
The disadvantages of Infrastructure is excessively huge, lacks strategic cover；Support can be provided for beyond-the-horizon communication and underground communication simultaneously, and shown
Write size, weight and the power consumption for reducing existing low frequency communication equipment.The invention proposes a kind of rotation electret-type machinery antennas
LF communication system is rotated using motor driven electret in mechanical antenna, to form alternating low frequency magnetic field and emit magnetic field
The method of signal can be greatly lowered required antenna length and power consumption, and receive communication letter using induced signal receiver
Number, realize stable low frequency wireless communication.
A kind of rotation electret-type machinery antenna LF communication system of the invention, comprising: low-frequency magnetic field signal generates mould
Block and induced signal receiving module.The low-frequency magnetic field signal generation module includes motor and electrification electret in mechanical antenna
Body；It controls the motor in mechanical antenna and generates different rotating speeds, driving charged electret rotation generates the magnetic field letter of different frequency
Number；Required communication signal is loaded on generated magnetic field signal, emits signal to receiving direction using mechanical antenna.It is described
Induced signal receiving module include magnetic field sensor, magnetic field sensor receives the magnetic field signal launched, and is demodulated
Communication signal needed for obtaining.
The charged electret is to allow discharge tip uniformly staying by corona discharge technology on electret
Polar body surface-discharge, and change charge species, make electret a part with uniform positive charge, the uniform negative electricity of another part band
Lotus.When the described charged electret rotation, magnetic field caused by two parts of the different charges of electret band is overlapped mutually enhancing.
The workflow of rotation electret-type machinery antenna LF communication system provided by the invention is as follows:
1) keep electret a part of positively charged by corona discharge, another part is negatively charged, forms charged electret；
2) by the motor in mechanical antenna, the charged electret is driven to rotate together around geometric center, to be formed
The magnetic field of alternation generates low frequency alternating magnetic field signal；
3) on magnetic field signal caused by required communication signal being loaded into, using the mechanical antenna to receiving direction
Transmitting；
4) induced signal receiver receives magnetic field signal, modulation /demodulation magnetic field signal, and communication signal needed for obtaining is completed
Wireless communication.
Compared with prior art, the present invention having following clear superiority:
(1) the characteristics of making full use of ultra-low frequency and very low frequency radio wave is stayed using motor driven electrification in mechanical antenna
The method of polar body rotation forms low frequency alternating magnetic field and emits magnetic field signal, saves space and resource.
(2) compared with the working method of traditional antenna transmitter, radio transmitter can be greatly lowered in the present invention
Antenna length and power consumption, and communication signal is received using induced signal receiver, realize stable low frequency wireless communication.
(3) high precision and high sensitivity Weak magentic-field sensor is used, small magnetic field signal can be accurately measured, compared to connecing
It is small to receive electric field signal interference, accuracy height.
(4) built-in net charge almost permanent stabilization can be retained as electromagnetic wave generating material using electret.
(5) LF communication is used, propagation loss is small, long transmission distance and strong antijamming capability.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of rotation electret-type machinery antenna LF communication system of the invention；
Fig. 2 is low-frequency magnetic field signal generation module structure chart of the invention；
Fig. 3 is induced signal receiving module structure chart of the invention；
Fig. 4 is that electret rotation generates electromagnetic wave principle figure in the embodiment of the present invention.
Specific embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, with reference to the accompanying drawings and examples to this hair
It is bright to be described in further detail.It is described below and is for the purpose of illustration, rather than in order to limit.It is of the invention not departing from
Under the premise of spirit, a variety of changes and modification can be made in the range of the embodiment described in the text.For the sake of clarity, herein
All features actually realized are not described in specification.
As shown in Figure 1, a kind of rotation electret-type machinery antenna LF communication system proposed by the present invention, comprising: low frequency
Magnetic field signal generation module and induced signal receiving module, wherein low-frequency magnetic field signal generation module passes through in mechanical antenna
Motor, driving charged electret rotates together with, to form the low frequency magnetic field of alternation, generate low-frequency magnetic field signal and emit.It will
Required communication signal is loaded on generated magnetic field signal, emits signal to receiving direction using the mechanical antenna.Magnetic strength
Signal receiving module receives mixed magnetic field signal, completes to wirelessly communicate by modulation /demodulation.
As shown in Fig. 2, the structure of low-frequency magnetic field signal generation module of the present invention includes: power supply, processor, motor
And charged electret.Wherein, power supply is that processor and motor part are powered, and processor is connected with host computer, is required according to user
Power supply is controlled, to make motor generate different rotating speeds, to drive the magnetic field signal of charged electret rotation generation different frequency.
As shown in figure 3, the structure of induced signal receiving module of the present invention includes: that power supply, processor and magnetic field pass
Sensor.Wherein, power supply is that processor and magnetic field sensor part power, and processor is connected with host computer, requires to control according to user
Magnetic field sensor processed so that magnetic field sensor be made to receive the magnetic field signal launched, then obtains required communication by demodulation
Signal.
As shown in figure 4, electret rotation generates electromagnetic wave principle figure in the embodiment of the present invention, a kind of embodiment be by
Electret is processed into radius and is the disc-shape of 20cm, and keeps its surface half positively charged by point discharge, half
Negatively charged, electrically charged density is 3400nc/cm2.When the angular velocity omega direction of charged electret is that vertical paper is outside, i.e.,
When charged electret is around axis rotation where the center of circle, go to from the point of view of position shown in Fig. 4, the current direction of positively charged semicircle to
On, the magnetic direction that generates on the right side of semicircle is that vertical paper is outside, the direction generated on the left of semicircle be vertical paper inwards.
It can similarly obtain, at this point, the rotation direction of electronegative semicircle is downward, current direction is still upward, the magnetic generated on the right side of semicircle
Field direction be vertical paper it is outside, the direction generated on the left of semicircle be vertical paper inwards.Therefore, in charged electret rotation
When, magnetic field caused by two parts with different charge is overlapped mutually enhancing, can generate stronger magnetic field signal, have
Conducive to the transmission of wireless communication.
Rotation electret-type machinery antenna LF communication system of the invention, the process to work are as follows:
Since electret almost permanent stabilization can retain built-in net charge, using described in electret conduct
System electromagnetic wave generating material.Firstly, allow discharge tip uniformly in electret surface-discharge by corona discharge technology, and
After a period of time of discharging, changes charge species, make electret a part with uniform positive charge, another part band is uniformly born
Charge.
Then by the motor in mechanical antenna, driving charged electret is rotated around geometric center together, to form change
The low frequency magnetic field of change generates low frequency alternating magnetic field signal.This is different from the traditional antenna generation method of electromagnetic wave, and traditional antenna is
By oscillating circuit as electromagnetic wave generating source, and since the wavelength of ultra-low frequency electromagnetic wave is 1000~10000km, set up
Ultralow frequency antenna be designed to tens kilometers long to kilometers up to a hundred, antenna loop area reaches tens of or even hundreds of square kilometres, and adopts
With low-frequency electromagnetic wave production method of the present invention, the size and power consumption of required antenna can be greatly reduced, save space
And resource.
Again by required communication signal load caused by low-frequency magnetic field signal, using the mechanical antenna to receiving direction
Transmitting, strong antijamming capability, long transmission distance and propagate it is reliable and stable, while using high precision and high sensitivity Weak magentic-field sense
Device receives mixed magnetic field signal, and compared with electric field signal, the interference that magnetic field signal is subject in communication process is small, therefore being capable of essence
Standard captures small magnetic field signal, and accuracy is high.It is low that required communication signal completion is obtained finally by demodulation mixed magnetic field signal
Frequency wireless communication procedure.
Claims (7)
1. a kind of rotation electret-type machinery antenna LF communication system, which is characterized in that generate mould including low-frequency magnetic field signal
Block and induced signal receiving module；
The low-frequency magnetic field signal generation module includes motor and charged electret in mechanical antenna；It controls in mechanical antenna
Motor generate different rotating speeds, driving charged electret rotation, generate the magnetic field signal of different frequency；Required communication signal is added
On magnetic field signal caused by being downloaded to, emit signal to receiving direction using mechanical antenna；
The induced signal receiving module includes magnetic field sensor, and magnetic field sensor receives the magnetic field signal launched, and
Carry out the communication signal needed for demodulation obtains.
2. system according to claim 1, which is characterized in that the charged electret is passed through on electret
Corona discharge technology allows discharge tip uniformly in electret surface-discharge, and changes charge species, makes electret a part band
Uniform positive charge, the uniform negative electrical charge of another part band.
3. system according to claim 2, which is characterized in that when the described charged electret rotation, electret band is not
Magnetic field caused by two parts with charge is overlapped mutually enhancing.
4. system according to claim 1 or 2, which is characterized in that one kind of the charged electret is achieved in that:
Electret is processed into radius and is the disc-shape of 20cm, and keeps its surface half positively charged by point discharge, one
Half is negatively charged, and electrically charged density is 3400nc/cm2。
5. system according to claim 1, which is characterized in that the low-frequency magnetic field signal generation module further includes power supply
And processor, power supply are that processor and motor are powered, processor is connected with host computer, requires control power supply according to user, makes machine
Motor in tool antenna generates different rotating speeds.
6. system according to claim 1, which is characterized in that the induced signal receiving module further includes power supply and place
Manage device；Wherein, power supply is that processor and magnetic field sensor are powered, and processor is connected with host computer, requires control magnetic according to user
Field sensor.
7. any system according to claim 1~5, which is characterized in that the workflow of the system includes:
1) keep electret a part of positively charged by corona discharge, another part is negatively charged, forms charged electret；
2) by the motor in mechanical antenna, the charged electret is driven to rotate together around geometric center, to form alternation
Magnetic field, generate low frequency alternating magnetic field signal；
3) it on magnetic field signal caused by required communication signal being loaded into, is sent out using the mechanical antenna to receiving direction
It penetrates；
4) induced signal receiver receives magnetic field signal, modulation /demodulation magnetic field signal, and communication signal needed for obtaining is completed wireless
Communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811009565.0A CN109004948B (en) | 2018-08-31 | 2018-08-31 | Rotary electret type mechanical antenna low-frequency communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811009565.0A CN109004948B (en) | 2018-08-31 | 2018-08-31 | Rotary electret type mechanical antenna low-frequency communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109004948A true CN109004948A (en) | 2018-12-14 |
| CN109004948B CN109004948B (en) | 2020-07-28 |
Family
ID=64590610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811009565.0A Active CN109004948B (en) | 2018-08-31 | 2018-08-31 | Rotary electret type mechanical antenna low-frequency communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109004948B (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110008545A (en) * | 2019-03-22 | 2019-07-12 | 北京航空航天大学 | A kind of rotation electret-type machinery antenna performance appraisal procedure based on simulation modeling |
| CN110083975A (en) * | 2019-05-14 | 2019-08-02 | 北京航空航天大学 | A kind of Analytic modeling method of cylindrical shape Low-Frequency Mechanical antenna |
| CN110083976A (en) * | 2019-05-14 | 2019-08-02 | 北京航空航天大学 | A kind of Analytic modeling method of cydariform Low-Frequency Mechanical antenna |
| CN110120831A (en) * | 2019-03-25 | 2019-08-13 | 北京航空航天大学 | A kind of LF communication method based on spaceborne mechanical antenna |
| CN110146752A (en) * | 2019-05-27 | 2019-08-20 | 北京航空航天大学 | A kind of electret machinery antenna charging effect assessment method |
| CN110166390A (en) * | 2019-03-21 | 2019-08-23 | 西安理工大学 | Amplitude modulation means and modulator approach for mechanical antenna low-frequency magnetic signal radiation |
| CN110165787A (en) * | 2019-05-27 | 2019-08-23 | 北京航空航天大学 | A kind of charging unit of electret machinery antenna |
| CN110581355A (en) * | 2019-09-05 | 2019-12-17 | 北京航空航天大学 | Flexible mechanical antenna communication system based on electret |
| CN110767993A (en) * | 2019-10-25 | 2020-02-07 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Oscillating mechanical antenna |
| CN110943953A (en) * | 2019-10-25 | 2020-03-31 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Transmission system based on rotary mechanical antenna and information loading method |
| CN111162385A (en) * | 2020-01-17 | 2020-05-15 | 大连交通大学 | Ultra-low frequency mechanical antenna array with adjustable phase amplitude |
| CN114095323A (en) * | 2021-10-13 | 2022-02-25 | 西安电子科技大学 | Mechanical antenna time-frequency combined modulation system, method, equipment, medium and terminal |
| CN114224227A (en) * | 2021-08-06 | 2022-03-25 | 杭州嘉隆物联网科技有限公司 | Information coding method for frequency and position double modulation |
| CN115021848A (en) * | 2022-08-03 | 2022-09-06 | 中国人民解放军海军工程大学 | Frequency modulation signal analysis method and device of rotary mechanical antenna |
| CN116260529A (en) * | 2023-03-10 | 2023-06-13 | 中国舰船研究设计中心 | Cross-seawater medium high-speed information transmission device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101189908A (en) * | 2005-06-06 | 2008-05-28 | 松下电器产业株式会社 | Method of turning condenser microphone into electret, electret-turning device and method of producing condenser microphone using this |
| CN103339797A (en) * | 2010-09-13 | 2013-10-02 | 无线电物理解决方案有限公司 | Improvements in or relating to millimeter and sub-millimeter wave radar-radiometric imaging |
| CN103441803A (en) * | 2013-09-10 | 2013-12-11 | 北京科技大学 | Underground low-frequency wireless communication system based on low-power small electric antenna |
| CN104246595A (en) * | 2012-03-21 | 2014-12-24 | 株式会社樱花彩色笔 | Fine electretic particles and process for producing same |
| CN108346851A (en) * | 2017-12-26 | 2018-07-31 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | A kind of low-frequency antenna |
-
2018
- 2018-08-31 CN CN201811009565.0A patent/CN109004948B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101189908A (en) * | 2005-06-06 | 2008-05-28 | 松下电器产业株式会社 | Method of turning condenser microphone into electret, electret-turning device and method of producing condenser microphone using this |
| CN103339797A (en) * | 2010-09-13 | 2013-10-02 | 无线电物理解决方案有限公司 | Improvements in or relating to millimeter and sub-millimeter wave radar-radiometric imaging |
| CN104246595A (en) * | 2012-03-21 | 2014-12-24 | 株式会社樱花彩色笔 | Fine electretic particles and process for producing same |
| CN103441803A (en) * | 2013-09-10 | 2013-12-11 | 北京科技大学 | Underground low-frequency wireless communication system based on low-power small electric antenna |
| CN108346851A (en) * | 2017-12-26 | 2018-07-31 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | A kind of low-frequency antenna |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110166390B (en) * | 2019-03-21 | 2022-05-20 | 西安理工大学 | Amplitude modulation device and modulation method for low-frequency magnetic signal radiation of mechanical antenna |
| CN110166390A (en) * | 2019-03-21 | 2019-08-23 | 西安理工大学 | Amplitude modulation means and modulator approach for mechanical antenna low-frequency magnetic signal radiation |
| CN110008545A (en) * | 2019-03-22 | 2019-07-12 | 北京航空航天大学 | A kind of rotation electret-type machinery antenna performance appraisal procedure based on simulation modeling |
| CN110120831A (en) * | 2019-03-25 | 2019-08-13 | 北京航空航天大学 | A kind of LF communication method based on spaceborne mechanical antenna |
| CN110083975A (en) * | 2019-05-14 | 2019-08-02 | 北京航空航天大学 | A kind of Analytic modeling method of cylindrical shape Low-Frequency Mechanical antenna |
| CN110083976A (en) * | 2019-05-14 | 2019-08-02 | 北京航空航天大学 | A kind of Analytic modeling method of cydariform Low-Frequency Mechanical antenna |
| CN110146752A (en) * | 2019-05-27 | 2019-08-20 | 北京航空航天大学 | A kind of electret machinery antenna charging effect assessment method |
| CN110165787A (en) * | 2019-05-27 | 2019-08-23 | 北京航空航天大学 | A kind of charging unit of electret machinery antenna |
| CN110581355A (en) * | 2019-09-05 | 2019-12-17 | 北京航空航天大学 | Flexible mechanical antenna communication system based on electret |
| CN110767993A (en) * | 2019-10-25 | 2020-02-07 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Oscillating mechanical antenna |
| CN110943953A (en) * | 2019-10-25 | 2020-03-31 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Transmission system based on rotary mechanical antenna and information loading method |
| CN110943953B (en) * | 2019-10-25 | 2022-10-11 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Transmission system based on rotary mechanical antenna and information loading method |
| CN111162385A (en) * | 2020-01-17 | 2020-05-15 | 大连交通大学 | Ultra-low frequency mechanical antenna array with adjustable phase amplitude |
| CN111162385B (en) * | 2020-01-17 | 2021-05-07 | 大连交通大学 | Ultra-low frequency mechanical antenna array with adjustable phase amplitude |
| CN114224227A (en) * | 2021-08-06 | 2022-03-25 | 杭州嘉隆物联网科技有限公司 | Information coding method for frequency and position double modulation |
| CN114095323A (en) * | 2021-10-13 | 2022-02-25 | 西安电子科技大学 | Mechanical antenna time-frequency combined modulation system, method, equipment, medium and terminal |
| CN114095323B (en) * | 2021-10-13 | 2023-02-03 | 西安电子科技大学 | Mechanical antenna time-frequency combined modulation system, method, equipment, medium and terminal |
| CN115021848A (en) * | 2022-08-03 | 2022-09-06 | 中国人民解放军海军工程大学 | Frequency modulation signal analysis method and device of rotary mechanical antenna |
| CN115021848B (en) * | 2022-08-03 | 2022-11-25 | 中国人民解放军海军工程大学 | Frequency modulation signal analysis method and device of rotary mechanical antenna |
| CN116260529A (en) * | 2023-03-10 | 2023-06-13 | 中国舰船研究设计中心 | Cross-seawater medium high-speed information transmission device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109004948B (en) | 2020-07-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109004948A (en) | A kind of rotation electret-type machinery antenna LF communication system | |
| KR101555311B1 (en) | Positioning, detection and communication system and method | |
| US8315560B2 (en) | Underwater navigation | |
| US20180284252A1 (en) | Geolocation with guided surface waves | |
| IL191589A (en) | Positioning system and method | |
| RU2483326C2 (en) | Hydroacoustic synchronous range-finding navigation system for positioning underwater objects in navigation field of randomly arranged hydroacoustic transponder beacons | |
| CN112285785B (en) | Electromagnetic detection method without near-field effect | |
| CN111780852B (en) | Device and method for measuring deep sea performance of low-frequency transducer in real time | |
| CN109814161A (en) | A kind of magnetic air resonance underground water detection device and method | |
| CN108717995A (en) | A kind of microminiature ULF/VLF rotation charge antenna and signal amplitude-frequency modulator approach | |
| WO2020035490A1 (en) | Underwater navigation | |
| RU2279696C1 (en) | Naval polarization seismic prospecting method | |
| US10839278B1 (en) | Electromagnetic exploration method using full-coverage anti-interference artificial source | |
| CN111220947B (en) | Magnetic induction through-the-earth positioning method based on path loss | |
| US2823365A (en) | Electro-acoustic system and method | |
| CN201804125U (en) | Wireless electromagnetic wave mine locator | |
| RU2363964C1 (en) | Device designed to monitor local irregularities and geodynamic zones of geological section top part (gst) | |
| US2545179A (en) | Submarine marker with sonic signal generators | |
| RU2598622C1 (en) | System and method of collecting seismic data | |
| RU2388021C1 (en) | Underwater station | |
| Feng et al. | Research on Key Technology of Ultra-High-Frequency Underwater Receiving Antenna | |
| RU2755001C1 (en) | Underwater system for seismic exploration at sea | |
| RU2178629C1 (en) | Process measuring level of pressure of noise making on moving object in full-scale basin | |
| Yang et al. | The forward modeling of the wireless electromagnetic method based on" Earth-ionosphere" mode | |
| Lin | Field generated by the artificial ionospheric modulation of ELF/VLF wave on the sea surface |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |