CN109326870A - The marine satellite antenna that anti-rolling is rocked - Google Patents
The marine satellite antenna that anti-rolling is rocked Download PDFInfo
- Publication number
- CN109326870A CN109326870A CN201811297006.4A CN201811297006A CN109326870A CN 109326870 A CN109326870 A CN 109326870A CN 201811297006 A CN201811297006 A CN 201811297006A CN 109326870 A CN109326870 A CN 109326870A
- Authority
- CN
- China
- Prior art keywords
- antenna
- parabola
- pulley
- rolling
- rocked
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/18—Means for stabilising antennas on an unstable platform
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/125—Means for positioning
- H01Q1/1264—Adjusting different parts or elements of an aerial unit
Abstract
This case is related to a kind of marine satellite antenna that anti-rolling is rocked, and including pedestal and the antenna system being mounted on the base, the antenna system includes bracket, the parabola antenna being installed on bracket, the positioning device for being installed on parabola antenna edge；Parabola antenna outer ledge side is equipped with the driving pulley of first motor driving, and the first motor is installed on the driving pulley, controls driving pulley rotation by gear or transmission chain；The parabola antenna outer ledge other side is equipped with follow-up pulley；The parabola antenna exterior bottom installs counter weight device, and the counter weight device includes slide bar, screw rod and clump weight；Marine satellite antenna structure of the invention is simple, at low cost, requires low, cost performance and practical value with higher for pose adjustment precision, the adjustment response speed of carried pedestal.
Description
Technical field
The invention belongs to marine satellite antenna fields, and in particular to the marine satellite antenna that anti-rolling is rocked.
Background technique
Since man invented satellite, satellite communication just occur with the life of the mankind it is inseparable contact, such as satellite
TV, satellite broadcasting, satellite phone etc..Satellite communication is realized by synchronous satellite forwarding capability, and floor portion mouth is defended to synchronizing
Star emits relevant audio-video signal, this signal is descended acoustic vision signal, signal institute by synchronous satellite according to a certain direction
Capped region all can receive signal by satellite receiving equipment, watch program: a good satellite receiving equipment, for
The quality of satellite communication plays a crucial role.
Most important one kind is exactly satellite antenna in satellite receiving equipment, that is, we daily described " pot ", be one
A metal paraboloid is responsible for for satellite-signal being reflected into the feed and tuner of focal point.The effect of satellite antenna is
The small-signal transmitted by satellite is collected, and is eliminated as much as noise.Except some multifocal antennas are by spherical surface and paraboloid group
Except conjunction forms, most of satellite antennas are usually parabolic.It is concentrated after the reflection that satellite-signal passes through parabola antenna
To its focal point.
In modern waterborne commerce, once ship offshore, just can only be contacted by satellite communication and the external world, therefore, satellite day peculiar to vessel
Line is almost the standard configuration of all oceangoing voyage ships, and marine satellite antenna is the satellite antenna being arranged aboard ship, by servo-drive
Motor drives antenna movement, to be always maintained at the tracking to satellite during exercise.It is calculated accordingly in order to what standard was cut
Horizontal angle, the elevation angle, polarizing angle, it is necessary to have an accurate direction sign, this direction sign is provided by the compass of built-in antenna
Accurate data, or external compass is connected by equipment interface.Then correct numerical value is calculated by antenna system,
Then system is by driving servo-driver to position antenna accurately.This antenna is also current most complicated to require technology highest
Antenna.Since ship can generate displacement in the process of moving, marine satellite antenna needs timely adjustment direction, and direction
Adjustment need certain limit function, otherwise unconfined rotation seeks star and will cause inner antenna electric wire coiling, to make
At the damage of antenna, therefore satellite peculiar to vessel requires limiting device.
In addition, boat-carrying satellite communication antena is in practical applications, since at sea mobility and being waved by ship is brought for it
Antenna beam roll, satellite antenna must adjust self-view constantly to keep the optimum reception posture to satellite-signal, when defending
When star antenna tracking satellite-signal, transponder polarization direction is often deviateed in antenna polarization direction, causes signal fadeout and serious
Cross polarization interference.
Since marine satellite antenna is needed through largely sensing, electric control element, and pass through complicated driven Design ability
Realize tracking to satellite-signal, therefore, the higher marine satellite antenna of sensitivity, price is expensive；And due to a large amount of
Sensing, electric control element all weather operations, abrasion, aging speed it is fast, vulnerable to aquatic environment destroy, maintenance expense also compared with
It is high.
Ship is in real navigation, due to the fluctuation of water, it may occur that the rolling along beam direction rocks and along captain's degree
The pitching in direction is rocked；Since the length of ship is much higher than beam, rolling is rocked and usually to be rocked more than pitching seriously.Cause
This, mitigating the work for rolling and rocking can rock in Ship Design prior to mitigating pitching.Under normal conditions, in the rolling side of rocking
The ship of face qualification also implies that it meets the requirement that pitching is rocked.
In ship line navigation, marine satellite antenna, which need to only overcome to rock due to hull rolling, to be affected, and just can be generated
Preferable signal reception；In the design of marine satellite antenna, such as only consider that the rolling of ship is overcome to rock bring influence,
The material cost and complex degree of structure of marine satellite antenna can be greatly reduced, while can also ensure the signal of marine satellite antenna
Reception ability is not significantly affected；Based on this consideration, a kind of marine satellite antenna is proposed.
Summary of the invention
The object of the present invention is to provide one kind can be equipped on the pedestal with basic pose adjustment function, and signal receives
Stable, lower-cost marine satellite antenna.
What it is a further object to provide a kind of according to ship in navigation wave feature and that designs anti-roll shakes
The marine satellite antenna of rolling.
In order to solve the above-mentioned technical problem, the invention discloses a kind of marine satellite antennas that anti-rolling is rocked, including bottom
Seat and the antenna system being mounted on the base, the antenna system include bracket, the parabola antenna being installed on bracket, installation
Positioning device in parabola antenna edge；
The bracket includes the chassis for the crescent being mounted on the base and the ring for being mounted on chassis crescent-shaped ends
Shape frame, the toroidal frame inside are equipped with guide rail；
Parabola antenna outer ledge side is equipped with the driving pulley of first motor driving, and the first motor is installed on
On the driving pulley, driving pulley rotation is controlled by gear or transmission chain；The parabola antenna outer ledge other side
Follow-up pulley is installed, the driving pulley and follow-up pulley are located at the same radial line both ends of the parabola antenna；It is described fixed
Where position device is set to the driving pulley and follow-up pulley on radial line；
The driving pulley and follow-up pulley are moved along the guide rail, and are pivotally connected by bearing and the parabola antenna；
The parabola antenna exterior bottom installs counter weight device, and the counter weight device includes slide bar, screw rod and clump weight, described
Slide bar one end is mounted on parabola antenna bottom center, and the other end is mounted on parabola antenna edge, the cunning
Bar is vertical with radial line where the driving pulley and follow-up pulley；The screw rod is arranged in parallel with the slide bar, the clump weight
It is equipped with first through hole and the second through-hole, the slide bar is socketed by first through hole and clump weight, and the screw rod is logical by second
Hole and clump weight are socketed.
Preferably, second through-hole is equipped with the internal screw thread to match with screw rod；The screw rod is driven by the second motor
It is dynamic.
Preferably, the pedestal is used to carry out general adjustment to the pitch angle and orientation of parabola antenna, to reach
Signal tracing purpose；The pedestal includes controller.
Preferably, the first motor and the second motor are connect with the controller, and the controller is according to paraboloid
The second motor of gesture drive of antenna, control screw rod rotation, self-balanced upper rotary position, plane is without outer where making parabola antenna
It is naturally parallel with toroidal frame under power state.
Preferably, the antenna system further includes antenna house.
Preferably, the antenna system further includes the auxiliary locator being installed on hull；The auxiliary positioning dress
The device of signal can be reflected or emit by being set to one, and the positioning device is using auxiliary locator as position reference, by controlling institute
State first motor, make positioning device always can face auxiliary locator, thus where making the driving pulley and follow-up pulley
The length direction of radial line and hull is consistent.
Preferably, the toroidal frame is equipped with clamping device, for engaging the parabola antenna；The locking dress
It sets and is connected with the controller, when posture of the pedestal to parabola antenna is adjusted, the clamping device is by institute
Parabola antenna locking is stated to fix；After posture is adjusted, the clamping device releases the card to the parabola antenna
Only fix.
Preferably, the locking form of the clamping device is the locking of pop-up fixture block or electromagnetism locking.
The marine satellite antenna that anti-rolling of the invention is rocked, has the advantage that
1. making ship when generation is rolled and rocked by utilizing the rest inertia of parabola antenna, only driving marine satellite antenna
Pedestal and bracket shake, and parabola antenna is by bearing and bracket, and straight line where pivoting point always with the length of ship
Direction keeping parallelism, this allows for parabola antenna since self inertia is not affected or less affected by the influence for rolling and rocking substantially；So
Ship is not only avoided when generation is rolled and rocked, antenna base is frequently adjusted parabola antenna posture, and extending makes
With the service life, use cost is reduced.
2. waving rule in navigation according to ship, the rolling of hull is made full use of to rock the signal to marine satellite antenna
Receiving influences to rock big feature more than pitching, and the rolling of hull is overcome to rock the shadow to satellite antenna by structure design
It rings, avoids adjustment lag issues when marine satellite antenna tracks satellite-signal under the conditions of more atrocious weather；Though
The pitching for so ignoring hull is rocked, but pitching is rocked and is not obvious on the reception influence of the signal of marine satellite antenna, and the present invention is set
Marine satellite antenna structure under meter is simple, at low cost, and pose adjustment precision, the adjustment response speed of carried pedestal are wanted
Ask low, cost performance and practical value with higher.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of marine satellite antenna that anti-rolling is rocked.
Fig. 2 is supporting structure schematic diagram.
Fig. 3 is parabola antenna structural schematic diagram.
Fig. 4 is counterweight block structure schematic diagram.
Specific embodiment
Below by embodiment, the present invention is described in further detail, to enable those skilled in the art referring to specification
Text can be implemented accordingly.
Such as " have " it should be appreciated that used herein, "comprising" and " comprising " term are not precluded one or more
The presence or addition of a other elements or combinations thereof.
Embodiment 1
As shown in Figs 1-4, a kind of marine satellite antenna that anti-rolling is rocked, including pedestal 1 and the aerial system being mounted on the base
System, the antenna system includes bracket 2, the parabola antenna being installed on bracket 3, the positioning for being installed on parabola antenna edge
Device 4；
The bracket 2 includes the chassis 201 for the crescent being mounted on the pedestal 1 and is mounted on chassis crescent-shaped ends
Toroidal frame 202, setting 606 on the inside of the toroidal frame 202 has guide rail 203；
The 3 outer ledge side of parabola antenna is equipped with the driving pulley 301 of first motor driving 303, first electricity
Machine 303 is installed on the driving pulley 301, controls driving pulley rotation by gear or transmission chain；The parabola antenna 3
The outer ledge other side is equipped with follow-up pulley 302, and the driving pulley 301 and follow-up pulley 302 are located at the paraboloid day
The same radial line both ends of line 3；The positioning device 4 is set to the driving pulley 301 and follow-up pulley institute 302 on radial line.
The driving pulley 301 and follow-up pulley 302 are moved along the guide rail, and pass through bearing 5 and the paraboloid day
Line pivot joint；Driving pulley 301 and follow-up pulley 302 drive parabola antenna 3 to rotate around itself center of circle, and parabola antenna 3 is because being
Uniform even surface, its own rotation will not influence signal and receive stability.
3 exterior bottom of parabola antenna installs counter weight device 6, and the counter weight device 6 includes slide bar 601, screw rod 602
With clump weight 603, described 601 one end of slide bar is mounted on 3 bottom center of parabola antenna, and the other end is mounted on throwing
3 edge of object plane antenna, the slide bar 601 are vertical with the driving pulley 301 and 302 place radial line of follow-up pulley；The screw rod
602 are arranged in parallel with the slide bar 601, and the clump weight 603 is equipped with first through hole 604 and the second through-hole 605, the slide bar
It is socketed by first through hole 604 and clump weight 603, the screw rod 602 is socketed by the second through-hole 605 with clump weight 603.It is described
Counter weight device 6 is vertical with the driving pulley 301 and 302 place radial line of follow-up pulley, when the driving pulley 301 and driven cunning
Take turns 302 place radial lines it is consistent with the length direction of hull when, the clump weight 603 adjusts parabolic by the change of self-position
The whole center of gravity of surface antenna 3, makes it reach stable posture in its natural state.It needs to be loaded into the controller of antenna and set in advance
The control program set, the control program includes under different parabola antenna postures, in order to keep parabola antenna energy
Stable is in the posture, described even if also plane where parabola antenna is naturally parallel with toroidal frame under no external force state
What position clump weight should be at, and reach corresponding second motor, 606 rotation amount in the position.
Second through-hole 605 is equipped with the internal screw thread to match with screw rod 602；The screw rod 602 is by the second motor 606
Driving.
The pedestal 1 is used to carry out general adjustment to the pitch angle and orientation of parabola antenna 3, to reach signal tracing
Purpose；The pedestal 1 includes controller.
The first motor 605 and the second motor 606 are connect with the controller, and the controller is according to parabola antenna
The second motor of gesture drive 606, control screw rod 602 rotate, 603 position of self-balanced upper rotary makes 3 place plane of parabola antenna
It is naturally parallel with toroidal frame 202 under no external force state.By self-balanced upper rotary 603, change the center of gravity position of parabola antenna 3
It sets, makes parabola antenna 3 that can receive signal in its natural state with stable posture；When hull rolling is rocked, paraboloid day
Line is not because self inertia is with ship motion, even if forcing parabola antenna 3 to produce by a small margin because rolling to rock for a long time
It waves, parabola antenna 3 also can return rapidly normal attitude after hull is relatively stable.
The antenna system further includes antenna house 7.Parabola antenna under state of the present invention according to inertia because that can adjust naturally
It is whole, vulnerable to extraneous weather, it is in metastable environmental protection using antenna house 7, it is received is conducive to signal
Stablize；Meanwhile antenna house 7 be also marine satellite antenna in through frequently with technological means.
The antenna system further includes the auxiliary locator 8 being installed on hull；The auxiliary locator 8 can for one
The device of reflection or transmitting signal, the positioning device 4 is using auxiliary locator as position reference, by controlling first electricity
Machine 605, make positioning device 4 always can face auxiliary locator 8, to make 302 institute of the driving pulley 301 and follow-up pulley
It is consistent in the length direction of radial line and hull.Auxiliary locator 8 is installed on hull, makes 301 He of driving pulley
The length direction of 302 place radial line of follow-up pulley and hull is always consistent, so makes driving pulley 301 and follow-up pulley
The 302 bearing directions connected, the i.e. rotation axis of parabola antenna, parallel with hull always, being rocked by hull rolling is influenced
Also minimum.
The toroidal frame is equipped with clamping device 9, for engaging the parabola antenna；The clamping device with it is described
Controller is connected, and when posture of the pedestal to parabola antenna is adjusted, the clamping device 9 is by the paraboloid
The locking of antenna 3 is fixed；After posture is adjusted, the locking of the parabola antenna is fixed in the clamping device releasing.
The locking form of the clamping device is electromagnetism locking.When ship navigation turns to or longitude and latitude where navigation is substantially change over long distances,
The posture that pedestal needs to adjust parabola antenna just can guarantee the reception of satellite-signal, adjust in pedestal 1 to parabola antenna 3
When whole, if do not fixed to parabola antenna 3, parabola antenna 3, which will appear, to be swung and then causes pedestal 1 that can not carry out to it
Accurately pose adjustment.
Embodiment 2
When ship navigates by water, start marine satellite antenna, after system initialization, pedestal 1 adjusts 3 posture of parabola antenna, automatically to defending
Star signal is tracked, and clamping device 9 is fixed by parabola antenna 3 during pose adjustment；After pose adjustment, locking dress
It sets 9 to pack up, auxiliary locator 8 is reference to the positioning device 4, sends position signal to controller, controller is according to position
Confidence number drives first motor mobile 605, makes driving pulley 301 and follow-up pulley 302 and its 5 direction of bearing connected,
That is the rotating shaft direction of parabola antenna 3, it is parallel with ship length direction always；At the same time, controller is according to paraboloid day
The current posture of line adjusts counter weight device 6, clump weight 603 is made to be in appropriate posture；After all adjustment, paraboloid day
Line 3 automatically reverts to the optimum posture of pedestal adjustment gradually；It can start to stablize at this time and receive satellite-signal；
When ship navigation turns to or longitude and latitude where navigation is substantially change over long distances, parabola antenna 3 is consolidated in the starting of clamping device 9
It is fixed, after again passing by above-mentioned adjustment, restart to stablize reception satellite-signal.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and embodiment shown and described herein.
Claims (8)
1. a kind of marine satellite antenna that anti-rolling is rocked, including pedestal and the antenna system being mounted on the base, feature exists
In the antenna system includes bracket, the parabola antenna being installed on bracket, the positioning dress for being installed on parabola antenna edge
It sets；
The bracket includes the chassis for the crescent being mounted on the base and the ring for being mounted on chassis crescent-shaped ends
Shape frame, the toroidal frame inside are equipped with guide rail；Parabola antenna outer ledge side is equipped with the master of first motor driving
Movable pulley, the first motor are installed on the driving pulley, control driving pulley rotation by gear or transmission chain；It is described
The parabola antenna outer ledge other side is equipped with follow-up pulley, and the driving pulley and follow-up pulley are located at the paraboloid day
The same radial line both ends of line；Where the positioning device is set to the driving pulley and follow-up pulley on radial line；The active is sliding
Wheel and follow-up pulley are moved along the guide rail, and are pivotally connected by bearing and the parabola antenna；On the outside of the parabola antenna
Counter weight device is installed in bottom, and the counter weight device includes slide bar, screw rod and clump weight, and described slide bar one end is mounted on parabolic
Surface antenna bottom center, the other end are mounted on parabola antenna edge, the slide bar and the driving pulley and driven
Radial line where pulley is vertical；The screw rod is arranged in parallel with the slide bar, and the clump weight is equipped with first through hole and second and leads to
Hole, the slide bar are socketed by first through hole and clump weight, and the screw rod is socketed by the second through-hole and clump weight.
2. the marine satellite antenna that anti-rolling as described in claim 1 is rocked, which is characterized in that second through-hole is equipped with
The internal screw thread to match with screw rod；The screw rod is by the second motor driven.
3. the marine satellite antenna that anti-rolling as claimed in claim 2 is rocked, which is characterized in that the pedestal is used for parabolic
The pitch angle and orientation of surface antenna carry out general adjustment, to reach signal tracing purpose；The pedestal includes controller.
4. the marine satellite antenna that anti-rolling as claimed in claim 3 is rocked, which is characterized in that the first motor and second
Motor is connect with the controller, gesture drive second motor of the controller according to parabola antenna, control screw rod rotation,
Self-balanced upper rotary position keeps plane where parabola antenna naturally parallel with toroidal frame under no external force state.
5. the marine satellite antenna that anti-rolling as described in claim 1 is rocked, which is characterized in that the antenna system further includes
Antenna house.
6. the marine satellite antenna that anti-rolling as described in claim 1 is rocked, which is characterized in that the antenna system further includes
The auxiliary locator being installed on hull；The auxiliary locator is a device that can reflect or emit signal, described fixed
Position device, by controlling the first motor, makes positioning device always can face auxiliary using auxiliary locator as position reference
Positioning device, so that the length direction of radial line and hull where making the driving pulley and follow-up pulley is consistent.
7. the marine satellite antenna that anti-rolling as claimed in claim 6 is rocked, which is characterized in that the toroidal frame is equipped with card
Locking apparatus, for engaging the parabola antenna；The clamping device is connected with the controller, when the pedestal is to throwing
When the posture of object plane antenna is adjusted, the parabola antenna is engaged and is fixed by the clamping device；Posture has been adjusted
The locking of the parabola antenna is fixed in Bi Hou, the clamping device releasing.
8. the marine satellite antenna that anti-rolling as claimed in claim 7 is rocked, which is characterized in that the locking of the clamping device
Form is the locking of pop-up fixture block or electromagnetism locking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811297006.4A CN109326870A (en) | 2018-11-01 | 2018-11-01 | The marine satellite antenna that anti-rolling is rocked |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811297006.4A CN109326870A (en) | 2018-11-01 | 2018-11-01 | The marine satellite antenna that anti-rolling is rocked |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109326870A true CN109326870A (en) | 2019-02-12 |
Family
ID=65259951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811297006.4A Pending CN109326870A (en) | 2018-11-01 | 2018-11-01 | The marine satellite antenna that anti-rolling is rocked |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109326870A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112563725A (en) * | 2020-12-10 | 2021-03-26 | 华兴通信技术有限公司 | Wireless microwave communication device |
-
2018
- 2018-11-01 CN CN201811297006.4A patent/CN109326870A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112563725A (en) * | 2020-12-10 | 2021-03-26 | 华兴通信技术有限公司 | Wireless microwave communication device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109244634A (en) | Marine satellite antenna | |
| CN103138050B (en) | Three-axis stable follow-up tracking device of shipborne satellite antenna | |
| CN203250853U (en) | Three-axis stabilization mobile tracking mount of shipborne satellite antenna | |
| CN108475076A (en) | Antenna alignment method and ground control terminal | |
| US20180025651A1 (en) | Systems and devices to control antenna azimuth orientation in an omni-directional unmanned aerial vehicle | |
| CN103579736B (en) | A kind of mobile tracking mount of ship-board antenna | |
| CN105281017A (en) | Shipborne satellite communication antenna | |
| CN202737105U (en) | Boat-carrying antenna stabilized platform beam communication system | |
| CN103746186A (en) | Portable Ku-waveband marine satcom-on-the-move satellite communication antenna system | |
| CN104157977B (en) | 3-RPS Three dimensional rotation type parallel antenna structure system | |
| CN102937815A (en) | Automatic control device for shipborne satellite antenna | |
| US20190249906A1 (en) | Solar tracking system and solar tracking method | |
| CN108281756B (en) | Marine satellite antenna | |
| KR102102139B1 (en) | Six-degree-of-freedom attitude control system associated with antenna tracker | |
| CN102938502A (en) | Automatic tracking satellite television antenna for fishing boat | |
| CN205646161U (en) | Exceedingly high line during on -board moves | |
| CN109326870A (en) | The marine satellite antenna that anti-rolling is rocked | |
| CN205564991U (en) | During moving, new face small -size triaxial leads to satellite communications antenna | |
| CN209133679U (en) | The marine satellite antenna that anti-rolling is rocked | |
| GB2488388A (en) | Assisted positioning of a receiver device | |
| CN101938608B (en) | Ship satellite television receiver | |
| KR101594803B1 (en) | active multi-antenna tracking base station for vessel and offshore structure | |
| CN205564957U (en) | Novel on -board satellite lead to antenna system in moving | |
| CN111142144A (en) | Underwater acoustic positioning and timing buoy and underwater positioning method | |
| CN209133678U (en) | Marine satellite antenna |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190212 |
|
| WD01 | Invention patent application deemed withdrawn after publication |