CN100454787C - Positioning and aligning apparatus and method for free space optical communication system antenna - Google Patents
Positioning and aligning apparatus and method for free space optical communication system antenna Download PDFInfo
- Publication number
- CN100454787C CN100454787C CNB2006100395552A CN200610039555A CN100454787C CN 100454787 C CN100454787 C CN 100454787C CN B2006100395552 A CNB2006100395552 A CN B2006100395552A CN 200610039555 A CN200610039555 A CN 200610039555A CN 100454787 C CN100454787 C CN 100454787C
- Authority
- CN
- China
- Prior art keywords
- optical
- antenna
- detector
- processor
- amplifier
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Optical Communication System (AREA)
Abstract
The present invention relates to a device and a method for positioning and aligning antennae of a free space optical communication system, which is used for decreasing the reliance of the optical antennae on measuring instruments during a production process, shortening the on-site installation time of the optical antennae, and facilitating the provision of the optical antennae for the dynamic tracking. The device is composed of a light transmitting unit and a light receiving unit, wherein the light transmitting unit comprises laser light (104) carrying information, an originating transmission medium (103), an optical transmitting antenna (102), an incident light beam (101) and a transmitting terminal actuator (105). The light receiving unit comprises an auxiliary optical receiving antenna (107), an auxiliary light filter (108), an auxiliary detector (109), an amplifier comparator (110), a primary optical receiving antenna (111), a terminating transmission medium (112), a primary light filter (113), a primary detector (114), an amplifier (115), a processor (116), a controller (117), a display indicating circuit (118) and a receiving terminal actuator (119).
Description
Technical field
The present invention is a kind of apparatus and method that are used for the optical antenna of adjustment free-space optical communication system, belongs to the technical field of optical communication method.
Background technology
The tracking and the location technology that adopt in the existing free-space optical communication system comprise: Optical Transmit Unit adopts monochromatic light road or double light path dual mode; Light receiving unit utilizes array sensing device and two kinds of detection methods of quadrant sensors part.The transmitter unit of double light path makes free-space optical communication system complicated, and the senser element position of light receiving unit need be between optical receiver antenna and the receiver in the system on monochromatic light road, need take certain light energy in order to receive light signal.More than two kinds of described senser elements be the solid memder form, its installation form is fixed, area of detection is limited.Therefore, be difficult to solve and in a wider context described light beam searched for and located.
Optical antenna in the adjustment free-space optical communication system is requisite work in production process, the installation process, also be the problem that error will solve after producing in system's running, and help shortening the accent survey time by the hunting zone of increase receiving terminal to laser beam.
Summary of the invention
Technical problem: the location and alignment device and the method that the purpose of this invention is to provide a kind of free space optical communication system antenna, be used for reducing of the dependence of optical antenna production process to measuring instrument, shorten the time that the live optical antenna is installed, being beneficial to provides the optical antenna dynamic tracking.
Technical scheme: the location of free space optical communication system antenna of the present invention and alignment device are made of Optical Transmit Unit and light receiving unit; Optical Transmit Unit comprises the laser of carrying information, the transmission medium of making a start, optical transmitting antenna, incident beam, transmitting terminal actuator; Light receiving unit comprises secondary optical receiver antenna, secondary filter, secondary detector, amplifier comparator, main optical reception antenna, receiving end transmission medium, main filter, primary detector, amplifier, processor, controller, demonstration indicating circuit, receiving terminal actuator; The laser of carrying information joins by make a start transmission medium and optical transmitting antenna, and the incident beam that is sent by optical transmitting antenna passes through the light receiving unit that the transmitting terminal actuator is adjusted the directive receiving terminal; Main optical reception antenna, secondary optical receiver antenna receive irradiating light beam simultaneously, incident beam is by the output of main optical reception antenna, the output of main optical reception antenna connects primary detector through receiving end transmission medium and main filter, and primary detector, amplifier, processor, controller, receiving terminal actuator are connected in series in proper order; Incident beam is by secondary optical receiver antenna output, and the output of secondary optical receiver antenna connects secondary detector through secondary filter, and the output of secondary detector is connected to the input of amplifier comparator, the input of the output termination processor of amplifier comparator.After primary detector is finished opto-electronic conversion, its semaphore after amplifying, amplifier is delivered to processor, after secondary detector is finished opto-electronic conversion, its semaphore is connected to the input of amplifier comparator, the output termination of processor shows indicating circuit, to obtain the optical antenna status indication information, processor produces the control command via controller and delivers to the receiving terminal actuator; The receiving terminal actuator is adjusted light receiving unit, makes the main detector signal output variable reach maximum, by feedback circuit the transmitting terminal actuator is delivered in control information, adjusts the angle of optical antenna.Secondary optical receiver antenna has a plurality of, and symmetry is positioned at main optical reception antenna edge.The size of main filter is fit to the primary detector end face, and the position is in the primary detector front end; The size of secondary filter is fit to secondary detector end face, and the position is in secondary detector front end, has the narrow-band filtering characteristic and only allows to limit laser and pass through.
The location of free space optical communication system antenna and the location of alignment device and alignment methods are: incident beam incident main optical reception antenna, secondary optical receiver antenna, enter primary detector by receiving end transmission medium, main filter, enter secondary detector by secondary filter; The semaphore that is obtained by primary detector is through the follow up amplifier sending processor, the semaphore that secondary detector obtains is through the amplifier comparator sending processor, amount of information by the processor acquisition, determine the locus of described incident beam and export to show that indicating circuit provides the incident beam deviation information, processor output simultaneously also connects the receiving terminal actuator by controller, adjusts light receiving unit by the receiving terminal actuator; After primary detector is finished opto-electronic conversion, its semaphore is delivered to processor after amplifier amplifies, after secondary detector is finished opto-electronic conversion, its semaphore is connected to the input of amplifier comparator, processor produces the control command via controller and delivers to the receiving terminal actuator; The receiving terminal actuator is adjusted light receiving unit, makes the main detector signal output variable reach maximum.Technical essential is that the emission light beam is the laser of described carrying information, light receiving unit adopts the detection method of adding a form of separating, and wherein: the secondary detector of a plurality of separation is used for the position of detecting light beam on the incident light receiving element optical antenna and the differentiation of power; A primary detector is used to detect light and carries signal strength signal intensity, carries change in signal strength calibration incident beam receiver on main optical reception antenna focal plane according to detected light and makes the output of primary detector reach maximum in the position and the angle of target surface.
In the process of adjustment free space optical communication system antenna, the sectional area of the described laser beam of directive light receiving unit surpasses the common sectional area of light receiving unit through expanding bundle, when described light beam is injected light receiving unit, each detector monitors in the light receiving unit to be measured as: the luminous power or the light signal strength that behind filter, receive light beam.Difference and variation according to the amount size that obtains on each detector, enter processor after follow up amplifier by separately, the amplifier comparator conversion, the deviation of incident beam is easy to be extrapolated in processor, processor output bias amount of information, the demonstration indicating circuit realizes that with this deviation data shows, the deviation information amount can feed back to transmitting terminal, can be very fast by mechanical positioning mode calibration beam direction according to this deviation information Optical Transmit Unit; The position of receiver and angle also can be according to processor output bias amount of information size difference and variations on light receiving unit and the main optical reception antenna focus, adopt electromechanical means to optimize adjustment via controller control receiving terminal actuator, until primary detector output variable maximum.
Beneficial effect: the light detecting device that the present invention adopts is a general-purpose device, need not customization.Physical location for the secondary detector of small light receiving element places the main optical reception antenna outside; Physical location for the secondary detector of large-scale light receiving unit both can place optical antenna to converge on the light path of light, also can place the optical receiver antenna outside.Above-described physical location can be avoided or reduce receiving the loss of optical information energy.Simultaneously, also can increase hunting zone to incident beam, further adopt the peripheral hardware optical detecting unit that the hunting zone to light beam is significantly increased, to the dependence of measuring instrument, reach the set-up time of live optical antenna system in the favourable minimizing optical antenna system production process.
Description of drawings
Fig. 1 has provided under the proper communication condition, adopt the optical communication system schematic diagram of optical antenna, wherein have: collimated light beam 101, optical transmitting antenna 102, the transmission medium 103 of making a start, the laser 104 of carrying information, transmitting terminal actuator 105, light receiving unit 106, incident beam 101, secondary detector 109, main filter 113, secondary filter 108, secondary optical receiver antenna 107, main optical reception antenna 111, amplifier comparator 110, receiving end transmission medium 112, primary detector 114, amplifier 115, processor 116, controller 117, show indicating circuit 118, receiving terminal actuator 119;
Fig. 2 is light receiving unit under the alignment and beam distribution front view, Gaussian characteristics with the laser beam light distribution of carrying information wherein has: light beam 201, luminous power Gaussian Profile characteristic 202, secondary optical receiver antenna 203, main optical reception antenna 204;
Fig. 3 is the Gaussian characteristics of the laser beam light distribution of the light receiving unit under the misalignment state and beam distribution front view and carrying information.
Embodiment
The location and the alignment device of free space optical communication system antenna of the present invention comprise:
The Optical Transmit Unit of laser beam that is used for the emission carrying information of free space optical communication.
Described Optical Transmit Unit comprises:
The laser of carrying information is used for the free-space communication information carrier;
The transmission medium of making a start is used to transmit described laser to optical transmitting antenna;
Optical transmitting antenna is used for the emitting parallel light bundle;
The transmitting terminal actuator is used to adjust described beam emissions direction.
Be used to receive described emission laser beam, and, determine the light receiving unit device of described light-beam position according to the laser beam strength characteristic.
Described light receiving unit comprises:
A plurality of optical receiver antennas, promptly major and minor optical receiver antenna is used to converge the described laser beam that receives;
The multi-disc optical filter is used for only allowing described laser beam to pass through;
A plurality of detectors, promptly major and minor detector is used for the light signal of incident is converted to output signal of telecommunication amount;
A plurality of or multiple signals intensity amplifier comparator is used for corresponding amount of output after the intensity processing and amplifying of the described signal of telecommunication amount of described each detector;
Processor: be used to handle each described amplifier comparator output variable, obtain described beam distribution amount information;
Show indicating circuit: be used for each parts operating state of display light receiving element;
Controller: be used to control the receiving terminal actuator;
Receiving terminal actuator: be used to adjust the light receiving unit attitude.
The location of free space optical communication system antenna and alignment device are made of Optical Transmit Unit and light receiving unit; Optical Transmit Unit comprises the laser 104 of carrying information, the transmission medium 103 of making a start, optical transmitting antenna 102, incident beam 101, transmitting terminal actuator 105; Light receiving unit comprises secondary optical receiver antenna 107, secondary filter 108, secondary detector 109, amplifier comparator 110, main optical reception antenna 111, receiving end transmission medium 112, main filter 113, primary detector 114, amplifier 115, processor 116, controller 117, shows indicating circuit 118, receiving terminal actuator 119; The laser 104 of carrying information joins by make a start transmission medium 103 and optical transmitting antenna 102, and the incident beam 101 that is sent by optical transmitting antenna 102 passes through the light receiving unit 106 that transmitting terminal actuator 105 is adjusted the directive receiving terminals; Main optical reception antenna 111, secondary optical receiver antenna 107 receive irradiating light beam 101 simultaneously, incident beam 101 is by 111 outputs of main optical reception antenna, the output of main optical reception antenna 111 connects primary detector 114 through receiving end transmission medium 112 and main filter 113, and primary detector 114, amplifier 115, processor 116, controller 117, receiving terminal actuator 119 orders are connected in series; Incident beam 101 is by secondary optical receiver antenna 107 outputs, the output of secondary optical receiver antenna 107 connects secondary detector 109 through secondary filter 108, the output of secondary detector 109 is connected to the input of amplifier comparator 110, the input of the output termination processor 116 of amplifier comparator 110.Secondary optical receiver antenna 107 has a plurality of, and symmetry is positioned at main optical reception antenna 111 edges.The size of main filter 113, secondary filter 108 is fit to primary detector 114, secondary detector 109 end faces; The position is in the detector front end, has the narrow-band filtering characteristic and only allows to limit laser and pass through.The location of free space optical communication system antenna and the method for aiming at are usually expressed as the calibration operation flow process of free-space optical communication system:
The laser 104 that Fig. 1 provides carrying information becomes collimated light beam 101 to adjust the light receiving unit 106 of directive system by transmitting terminal actuator 105 after the transmission medium 103 of making a start is handled by optical transmitting antenna 102, light beam 101 respectively, after main optical reception antenna 116 converges, inject receiving end transmission medium 112 and deliver to primary detector 114 by main filter plate 113, after primary detector 114 is finished the opto-electronic conversion processing, its semaphore after amplifying, amplifier 115 is delivered to processor 116, after converging, secondary optical receiver antenna 107 injects secondary detector 109 by secondary filter 108, after secondary detector 109 is finished opto-electronic conversion, its semaphore is connected to the input of amplifier comparator 110, the input of the output termination processor 116 of amplifier comparator 110, the output termination of processor 116 shows indicating circuit 118, obtain the optical antenna status indication information with this, processor 116 produces control command simultaneously, control command via controller 117 is delivered to receiving terminal actuator 119, receiving terminal actuator 119 is adjusted the optical antenna attitude, make primary detector 114 signal output variables reach maximum, repeat above process and progressively finish calibration operation.
Fig. 2 is the Gaussian characteristics 202 of the laser beam light distribution of major and minor optical receiver antenna 204,203 and light beam 201 distribution front views and carrying information under the alignment.Incident beam 101, converge through optical receiver antenna 107, through secondary filter 108, inject each secondary detector 109, the luminous power of incident is measurable amount, the output variable of secondary detector 109 behind amplifier comparator 110, arrive corresponding amount, this amount is sent to processor 116.If receiving end transmission medium 112 target surface positions and angle are correct on main optical reception antenna 111 focal planes at this moment, the corresponding incident beam power of the output variable of primary detector 114, produce the maximum signal amount of information behind amplifier 115, this amount is sent to processor 116.According to the power distribution characteristics 202 (Fig. 2) of light beam 201, processor 116 error free signals send, and controller 117 no control commands are to receiving terminal actuator 119.Simultaneously, processor 116 sends the state idsplay order simultaneously and gives demonstration indicating circuit 118, the operating state of display light receiving element 106 each parts.If receiving end transmission medium 112 in the position deviation focal plane of target surface, needs the amount according to detector 109,114 output signal strengths, adjust the attitude of light receiving unit 106.At first, the angle of alignment light receiving element 106 (pitching, rotation) direction is in the allowed band error between each secondary detector 109 output variable, and the indication of primary detector 114 output signal strengths reaches maximum; Then, in XYZ direction of principal axis change receiving end transmission medium 112 target surface positions, to the adjustment of receiving end transmission medium 112 target surfaces variation according to primary detector 114 output signal amounts, treated device 116 draws control information via controller 117 to receiving terminal actuator 119, adjust by 119 pairs of receiving light paths of receiving terminal actuator, finally make primary detector 114 output index signal amounts reach maximum.
Fig. 3 is the Gaussian characteristics of the laser beam light distribution of the major and minor optical receiver antenna under the misalignment state and beam distribution front view and carrying information.With reference to Fig. 2, the first step is adjusted light receiving unit, by monitoring the show state that shows indicating circuit 118, makes light beam 302 reach maximum by one or two secondary detector 109 output index signal amounts that power distribution characteristics reached; Second step was delivered to transmitting terminal actuator 105 among Fig. 1 by feedback network with control information, adjust angle (pitching, the rotation) direction of optical transmitting antenna 102 by transmitting terminal actuator 105, the light beam power that each secondary detector 109 is received is basic identical, repeat above step, with the 1st step that provides, reach maximum until primary detector 114 output index signal amounts.
The special proposition, 116 pairs of features from each detector 109,114 output signal amount of processor are analyzed, and differentiate the work at present situation of optical antenna system, provide control signal instruction, system mode demonstration.Main foundation: because the light distribution of laser beam is a Gaussian characteristics, the luminous power that each detector is obtained is characterized as: the relative quantity that is in the primary detector output of beam center position should be the strongest.
Claims (4)
1. the location of a free space optical communication system antenna and alignment device is characterized in that this device is made of Optical Transmit Unit and light receiving unit; Optical Transmit Unit comprises the laser (104) of carrying information, the transmission medium of making a start (103), optical transmitting antenna (102), incident beam (101), transmitting terminal actuator (105); Light receiving unit comprises secondary optical receiver antenna (107), secondary filter (108), secondary detector (109), amplifier comparator (110), main optical reception antenna (111), receiving end transmission medium (112), main filter (113), primary detector (114), amplifier (115), processor (116), controller (117), shows indicating circuit (118), receiving terminal actuator (119); The laser of carrying information (104) joins by the transmission medium of making a start (103) and optical transmitting antenna (102), carry out light receiving unit (106) the main optical reception antenna (111) that (105) adjust the directive receiving terminal by the incident beam (101) that optical transmitting antenna (102) sends by transmitting terminal, secondary optical receiver antenna (107) receives irradiating light beam (101) simultaneously, incident beam (101) is by main optical reception antenna (111) output, the output of main optical reception antenna (111) connects primary detector (114) through receiving end transmission medium (112) and main filter (113), primary detector (114), amplifier (115), processor (116), controller (117), receiving terminal actuator (119) order is connected in series; Incident beam (101) is by secondary optical receiver antenna (107) output, the output of secondary optical receiver antenna (107) connects secondary detector (109) through secondary filter (108), the output of secondary detector (109) is connected to the input of amplifier comparator (110), the input of the output termination processor (116) of amplifier comparator (110); After primary detector is finished opto-electronic conversion, its semaphore after amplifying, amplifier is delivered to processor, after secondary detector is finished opto-electronic conversion, its semaphore is connected to the input of amplifier comparator, the output termination of processor shows indicating circuit, to obtain the optical antenna status indication information, processor produces the control command via controller and delivers to the receiving terminal actuator; The receiving terminal actuator is adjusted light receiving unit, makes the main detector signal output variable reach maximum, by feedback circuit the transmitting terminal actuator is delivered in control information, adjusts the angle of optical antenna.
2. the location of free space optical communication system antenna according to claim 1 and alignment device, it is a plurality of to it is characterized in that secondary optical receiver antenna (107) has, and symmetry is positioned at main optical reception antenna (111) edge.
3. the location of free space optical communication system antenna according to claim 1 and alignment device is characterized in that the size of main filter (113) is fit to primary detector (114) end face, and the position is in primary detector (114) front end; The size of secondary filter (108) is fit to secondary detector (109) end face, and the position is in secondary detector (109) front end, has the narrow-band filtering characteristic and only allows to limit laser and pass through.
4. the location of the location of a free space optical communication system antenna as claimed in claim 1 and alignment device and alignment methods, it is characterized in that incident beam (101) incident main optical reception antenna (111), secondary optical receiver antenna (107), by receiving end transmission medium (112), main filter (113) enters primary detector (114), enter semaphore that secondary detector (109) obtains by primary detector (114) through follow up amplifier (115) sending processor (116) by secondary filter (108), the semaphore that secondary detector (109) obtains is through amplifier comparator (110) sending processor (116), amount of information by processor (116) acquisition, determine the locus of described incident beam (101) and export to show that indicating circuit (118) provides incident beam (101) deviation information, processor (116) output simultaneously also connects receiving terminal actuator (119) by controller (117), adjusts light receiving unit by receiving terminal actuator (119); After primary detector is finished opto-electronic conversion, its semaphore is delivered to processor after amplifier amplifies, after secondary detector is finished opto-electronic conversion, its semaphore is connected to the input of amplifier comparator, processor produces the control command via controller and delivers to the receiving terminal actuator; The receiving terminal actuator is adjusted light receiving unit, makes the main detector signal output variable reach maximum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100395552A CN100454787C (en) | 2006-04-14 | 2006-04-14 | Positioning and aligning apparatus and method for free space optical communication system antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100395552A CN100454787C (en) | 2006-04-14 | 2006-04-14 | Positioning and aligning apparatus and method for free space optical communication system antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1845474A CN1845474A (en) | 2006-10-11 |
| CN100454787C true CN100454787C (en) | 2009-01-21 |
Family
ID=37064391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100395552A Expired - Fee Related CN100454787C (en) | 2006-04-14 | 2006-04-14 | Positioning and aligning apparatus and method for free space optical communication system antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100454787C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130636A (en) * | 2016-05-13 | 2016-11-16 | 安徽宏实紫晶光电研究所有限公司 | Transmitted in both directions LiFi system based on light beam scanning homing function and transmission method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101719790B (en) * | 2009-12-04 | 2013-01-30 | 山东大学 | Laser self-adoptive trace adjustment system |
| CN103345262B (en) * | 2013-06-25 | 2016-08-17 | 中国舰船研究设计中心 | A kind of turntable servo follow-up tracing alignment device for three-dimensional antenna cover performance test |
| CN109474348A (en) * | 2018-11-29 | 2019-03-15 | 南京邮电大学 | The calculation method of optical antenna for wireless light communication parallel transmission system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193851A (en) * | 1997-03-19 | 1998-09-23 | 美国电报电话公司 | Optical transceiver using common optical path for transmission and reception |
| US6493490B1 (en) * | 2000-12-18 | 2002-12-10 | Terabeam Corporation | Method and apparatus for receiving and aligning an optical communications beam with an integrated |
| CN1457154A (en) * | 2003-06-12 | 2003-11-19 | 东南大学 | Light beam divergent angle variable laser communications spire device without optical fibre and controlling method thereof |
| US20040033078A1 (en) * | 2002-08-13 | 2004-02-19 | Lightpointe Communications, Inc. | Apparatus and method for free-space optical communication |
| US20050013616A1 (en) * | 2003-07-14 | 2005-01-20 | Kelson Yen | Optical antenna system for free-space optical communication system |
| CN1624493A (en) * | 2003-12-04 | 2005-06-08 | 戴永江 | Laser aiming device in free space optical communication system |
| US20060018661A1 (en) * | 2002-03-04 | 2006-01-26 | Green Edward A | Alignment system |
-
2006
- 2006-04-14 CN CNB2006100395552A patent/CN100454787C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193851A (en) * | 1997-03-19 | 1998-09-23 | 美国电报电话公司 | Optical transceiver using common optical path for transmission and reception |
| US6493490B1 (en) * | 2000-12-18 | 2002-12-10 | Terabeam Corporation | Method and apparatus for receiving and aligning an optical communications beam with an integrated |
| US20060018661A1 (en) * | 2002-03-04 | 2006-01-26 | Green Edward A | Alignment system |
| US20040033078A1 (en) * | 2002-08-13 | 2004-02-19 | Lightpointe Communications, Inc. | Apparatus and method for free-space optical communication |
| CN1457154A (en) * | 2003-06-12 | 2003-11-19 | 东南大学 | Light beam divergent angle variable laser communications spire device without optical fibre and controlling method thereof |
| US20050013616A1 (en) * | 2003-07-14 | 2005-01-20 | Kelson Yen | Optical antenna system for free-space optical communication system |
| CN1624493A (en) * | 2003-12-04 | 2005-06-08 | 戴永江 | Laser aiming device in free space optical communication system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130636A (en) * | 2016-05-13 | 2016-11-16 | 安徽宏实紫晶光电研究所有限公司 | Transmitted in both directions LiFi system based on light beam scanning homing function and transmission method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1845474A (en) | 2006-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1898838B (en) | Directivity majorization for short range wireless mobile communication systems | |
| CN110308456A (en) | It is a kind of for improving the bias adjustment device and laser radar system of detection range | |
| CN109946662B (en) | Phased array weather radar built-in calibration system | |
| CN100454787C (en) | Positioning and aligning apparatus and method for free space optical communication system antenna | |
| US20030090765A1 (en) | Free-space optical communication system | |
| WO2014024196A4 (en) | Friend or foe identification system and method | |
| CN102520557B (en) | Efficient space light-optical fiber coupling method | |
| CN110739994B (en) | Free space optical communication link establishing method | |
| CN112881791B (en) | Method for calculating unknown ground radiation source transmitting power through pitch angle and azimuth angle | |
| CN101232314A (en) | Apparatus and method for correcting TDD intelligent antenna system | |
| WO2023168952A1 (en) | Many-to-many laser communication deployment apparatus and method | |
| CN102185654A (en) | Laser communication system | |
| CN101577583B (en) | Automatic tracking method and system for atmospheric laser communication | |
| CN103345262B (en) | A kind of turntable servo follow-up tracing alignment device for three-dimensional antenna cover performance test | |
| CN103308038A (en) | Laser receiving device and laser spot center identification method | |
| CN201523381U (en) | Atmosphere laser communication automatic tracking system | |
| CN114296186A (en) | Method for improving coupling efficiency of free space laser to single mode fiber | |
| CN105425213A (en) | Method and system for meteorological radar long distance radio frequency transmission | |
| CN110401483B (en) | Laser communication device and method | |
| CN108599398A (en) | A kind of Tracking and pointing system of laser transmission | |
| CN113965260B (en) | Space laser communication networking multi-spot simultaneous tracking method and device based on code division multiple access | |
| CN209992667U (en) | Laser radar device and detection system based on split lens | |
| CN112994884B (en) | Transmitting end, receiving end and system for quantum communication | |
| CN113595632B (en) | Space laser communication method and system based on multi-unit spliced array | |
| CN113364474B (en) | Dynamic gain wireless energy transmission system and method based on time reversal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090121 Termination date: 20150414 |
|
| EXPY | Termination of patent right or utility model |