CN102427166A - Light control microwave beam receiving system - Google Patents
Light control microwave beam receiving system Download PDFInfo
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- CN102427166A CN102427166A CN2011102438411A CN201110243841A CN102427166A CN 102427166 A CN102427166 A CN 102427166A CN 2011102438411 A CN2011102438411 A CN 2011102438411A CN 201110243841 A CN201110243841 A CN 201110243841A CN 102427166 A CN102427166 A CN 102427166A
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Abstract
The invention discloses a light control microwave beam receiving system, and relates to microwave photonics technology. The system comprises N antenna units, wherein each antenna unit is connected with a first input end of a photomodulator; a second input end of the photomodulator is connected with a laser source, and an output end of the photomodulator is connected with an input end of an optical signal processing unit; the optical signal processing unit comprises N input ends and M output ends, and is used for realizing the combination and redistribution of optical signals; and the M output ends of the optical signal processing unit are respectively connected with light delayed units with different length, and the time-delay quantity generated by the light delayed units to the wavelength interval of laser output by adjacent laser light sources just compensates the time-delay quantity generated by the microwave signals on the adjacent antenna units due to source direction. The system disclosed by the invention has the advantages that the system structure is simple, high data rate and multi-user requirements are satisfied, and the mobile communication performance is improved.
Description
Technical field
The present invention relates to the microwave photon field that learns a skill, particularly a kind of light-operated microwave beam receiving system.
Background technology
In recent years; Along with the continuous development of mobile communication, mobile subscriber's quantity increases severely, and data service is gradually to multimedia service evolution; Cause system information capacity and bandwidth sharp increase; In order to carry out multiple function simultaneously, follow the tracks of a plurality of users, the increasing demand of communication system that can multi-direction reception microwave signal is increased.
Traditional P AA (Phase Array Antenna; Phased array antenna) system can realize the reception of multi-direction microwave signal; It is made up of one group of smooth arrangement identical miniature antenna; Each miniature antenna all has the ability of emission and acknowledge(ment) signal, relies on the signal wave interference stack from the miniature antenna unit to realize directed output and scanning.But beam tilt makes the PAA system that the restriction of principle arranged in the application of wide-band microwave, can't satisfy the needs that modern economy is built.Adopt real-time delay unit to substitute phase shifter, can realize that the direction of microwave beam and microwave frequency are irrelevant, and then be used for The Wideband Signal Processing.But the real-time delayed time system of traditional phase array is made up of waveguide or coaxial cable; Loss of signal is big; Be subject to electromagnetic interference, when large scale array was used, system must use microwave devices such as the connecting line, power divider of huge number; Make the very big and complex and expensive of whole system volume, influence it and use widely.
Development along with microwave photon is learned can realize the transmission of microwave signal high bandwidth, low-loss, anti-electromagnetic interference in optical fiber, and in light weight, volume is little, cost is low.Therefore can carry out microwave beam at light-wave band and point to control, be called light-operated microwave beam and form network.It has observe that the spatial domain is wide, radiant power big, can be sensitive rapidly and carry out beam position, search in space specified simultaneously exactly, discern and follow the tracks of a plurality of targets, and also have good stability, reliability high, to advantages such as the capture rate of target are big.Because light-operated microwave beam forms the potentiality that network shows aspect mobile communication, countries such as the U.S., Britain, Canada, Spain, France, Japan, Korea S, Singapore, India, Russia have all dropped into great amount of manpower and material resources and have carried out the research that light-operated microwave beam forms.The research contents of its core comprises the research and development of light-operated phased array antenna, light-operated microwave beam formation system and relevant microwave photon device.
It partly is TTD (the True Time Delay that produces time-delay that light-operated microwave beam forms server; Light is really delayed time) unit; With microwave delay unit ratio, the TTD structure is variable, in light weight flexibly, volume is little, has very high antijamming capability for electromagnetic interference with crosstalking; The phase temperatures that is modulated at the microwave signal on the optical frequency in the optical fiber changes than the low one magnitude of same signal in the coaxial cable, and the mounting cost of optical fiber is than low many of other transmission lines.
Publication number is that 4736463 United States Patent (USP) discloses a kind of N * M phased array antenna system structure that can receive multi-direction microwave signal.As shown in Figure 1; In this antenna system; Array antenna unit receives the microwave signal in the space; Each antenna element is connected with a laser, and the light signal after the modulation is connected different detectors via the time delay optical fiber of optical branching device, different length respectively with optical combiner respectively, the microwave signal reduction that detector receives antenna element.When antenna unit number N and direction number M were big, this system needed N optical branching device, and M optical combiner, and the time delay optical fiber of N * M different length make the system configuration bulky complex to be not suitable for practical application.
Summary of the invention
The technical problem that (one) will solve
The technical problem that the present invention will solve is: how a kind of light-operated microwave beam receiving system is provided, to simplify the structure complexity of existing system.
(2) technical scheme
For solving the problems of the technologies described above; The present invention provides a kind of light-operated microwave beam receiving system; It comprises: N antenna element; Said antenna element independently receives microwave signal, and said antenna element connects the first input end of an optical modulator respectively, and said first input end is an electrical signal ports;
Second input of said optical modulator connects lasing light emitter, and said second input is the light signal input port; Said optical modulator receives the microwave signal of said first input end, and according to said microwave signal the laser signal that is got into by said second input is carried out intensity modulated; The light output end of said optical modulator connects the input of a light signal processing unit;
Said light signal processing unit comprises N input and M output, is used to realize the merging of N road light signal, and is re-assigned to a said M output; The M of a said light signal processing unit output connects the input of the different light delay unit of length respectively; Said smooth delay unit is to the amount of delay that the output Wavelength of Laser of adjacent said lasing light emitter is produced at interval, just compensates microwave signal because source direction and the amount of delay that on adjacent said antenna element, produced;
The output of said smooth delay unit connects the light input end of a photo-detector respectively; Said photo-detector is used for converting the light signal of N wavelength into microwave signal, and the microwave signal after these conversions is carried out the ripple that closes of microwave frequency band, exports total microwave signal at last.
Preferably, said N antenna element distributes point-blank, and keeps identical spacing between the adjacent said antenna element.
Preferably, the output Wavelength of Laser of said lasing light emitter is adjustable.
The output Wavelength of Laser of the lasing light emitter that preferably, adjacent said antenna element is corresponding keeps the equiwavelength to increase at interval or reduces.
Preferably, said smooth delay unit reduces with linear the increasing perhaps of optical wavelength variation the amount of delay of light wave.
Preferably, said light signal processing unit adopts optical coupler.
Preferably, said light signal processing unit comprises interconnected mixer and splitter.
Preferably, said smooth delay unit adopts dispersive optical fiber.
Preferably, said optical modulator adopts lithium niobate electrooptic modulator.
(3) beneficial effect
Light-operated microwave beam receiving system of the present invention; Through adopting the optical modulator of N output different wave length laser; In conjunction with the light signal processing unit, on the light delay unit, form the amount of delay difference naturally, realizing under the situation that M direction microwave signal received simultaneously; The number of light delay unit is reduced to M from N * M, effectively simplified system configuration; Simultaneously, through regulating the wavelength of light carrier, realized the scanning in the 180 degree scopes of plane, antenna element place is received; Through adopting photo-detector, realized that simultaneously opto-electronic conversion and microwave close ripple.To sum up, the embodiment of the invention said system through simple system structure, has satisfied High Data Rate, multi-user's demand, has improved the mobile communication performance.
Description of drawings
Fig. 1 is existing phased array antenna system structural representation;
Fig. 2 is the structural representation of first kind of described light-operated microwave beam receiving system of embodiment of the present invention;
Fig. 3 is that the described antenna unit array of the embodiment of the invention receives the microwave signal sketch map;
Fig. 4 is the delay effect sketch map of the said dispersive optical fiber of the embodiment of the invention;
Fig. 5 is the structural representation of second kind of described light-operated microwave beam receiving system of embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
Embodiment one
Fig. 2 is the structural representation of first kind of described light-operated microwave beam receiving system of embodiment of the present invention.As shown in Figure 2, said system comprises, N antenna element 36, and N is the natural number greater than 1, is used for the independent microwave signal 35 that receives a plurality of directions in space.A said N antenna element 36 distributes point-blank, and keeps identical spacing between the adjacent said antenna element 36.
Said antenna element 36 connects the first input end of optical modulator 38, and said first input end is an electrical signal ports, and second input of said optical modulator 38 connects lasing light emitter 37, and said second input is the light signal input port.Said optical modulator 38 adopts lithium niobate electrooptic modulator, receives the microwave signal 35 of said first input end, and carries out intensity modulated according to 35 pairs of laser signals of being come in by said second input of said microwave signal.
The output Wavelength of Laser of said lasing light emitter 37 is adjustable continuously; And in N the said lasing light emitter 37; The optical maser wavelength of adjacent two said lasing light emitters 37 differs a presetted wavelength at interval; Be that the output Wavelength of Laser of the corresponding lasing light emitter 37 of adjacent said antenna element 36 keeps the equiwavelength to increase at interval or reduces, thereby realize the scanning receiving function of the said system of the embodiment of the invention in the certain angle scope.
The light output end of said optical modulator 38 is connected to the input of a light signal processing unit; Said light signal processing unit adopts optical coupler 39; Said optical coupler 39 comprises N input and M output, is used to realize the merging of N road light signal and is re-assigned to a said M output.In the corresponding M road output of said M output, each road output signal all comprises the light wave of N wavelength.M is the natural number greater than 1.
The M of said optical coupler 39 output connects an independently input of light delay unit 40 respectively, and the length of M said smooth delay unit 40 has nothing in common with each other.The amount of delay that the output Wavelength of Laser of 40 pairs of adjacent said lasing light emitters 37 of said smooth delay unit is produced at interval just compensates the amount of delay that microwave signal is produced on adjacent said antenna element 36 owing to source direction.Said smooth delay unit 40 adopts linear dispersion optical fiber, can be known by the CHROMATIC DISPERSION IN FIBER OPTICS principle, and dispersive optical fiber is different to the time-delay of the light of different wave length, and the dispersive optical fiber of different length is also different to the time-delay of the light of same wavelength.In embodiments of the present invention, the amount of delay of 40 pairs of light waves of said smooth delay unit changes with optical wavelength and linearly increases or reduce, and said smooth delay unit 40 can also adopt other chromatic dispersion devices, such as Bragg grating.
The output of each said smooth delay unit 40 connects an independently light input end of photo-detector 41 respectively; Said photo-detector 41 is a microwave signal with the light signal independent translation of N wavelength; And simultaneously the microwave signal after these conversions is carried out the ripple that closes of microwave frequency band, export total microwave signal through the electrical signal of said photo-detector 41 at last.
To the operation principle of the described light-operated microwave beam receiving system of the embodiment of the invention be specified below.
Fig. 3 is that the described antenna unit array of the embodiment of the invention receives the microwave signal sketch map.As shown in Figure 3, N antenna element 36 distributes point-blank, and spacing is d between adjacent two antenna elements 36.Become the direction at θ angle to be transmitted to said antenna element 36 with a said N antenna element 36 with vertical direction on conplane microwave signal edge, two adjacent like this antenna elements 36 receive the time difference Δ τ of microwave signal
0=dsin θ/c, wherein c representes the aerial propagation velocity of microwave signal.
In order to compensate above-mentioned because the time-delay that the microwave signal incident angle causes; Make the microwave signal that detects reach maximum constructive interference; The microwave signal that we receive said antenna element 36 is modulated on the light wave of different wave length, and the wavelength of N light carrier of N the optical modulator 38 modulation outputs of corresponding N said antenna element 36 is followed successively by λ
1, λ
2... λ
N, the difference of the wavelength of two adjacent light carriers is Δ λ=λ
J+1-λ
j, 1≤j＜N.Redistribute after the light carrier merging of said optical coupler 39 with a said N different wave length, all comprise the light carrier of a said N different wave length in each road output simultaneously.
Can be known that by the CHROMATIC DISPERSION IN FIBER OPTICS principle dispersive optical fiber is different to the time-delay of the light of different wave length, the dispersive optical fiber of different length is also different to the time-delay of the light of same wavelength.Fig. 4 is the delay effect sketch map of the said dispersive optical fiber of the embodiment of the invention.As shown in Figure 4, said dispersive optical fiber is the Δ τ=DL Δ λ of two light carriers generations of Δ λ to the difference of wavelength, and wherein D representes the abbe number of dispersive optical fiber, and L representes the length of dispersive optical fiber.Therefore, under the situation that Δ λ fixes, the value of L is set reasonably, can realizes Δ τ=DL Δ λ=Δ τ
0=dsin θ/c promptly realizes the time-delay through said smooth delay unit 40, and compensation is because the time-delay that the microwave signal incident angle causes.
Through Δ τ=DL Δ λ=Δ τ
0=dsin θ/c changes, and (DLc Δ λ/d) that is to say as Δ λ fixedly the time, can realize the reception to the microwave signal of different incidence angles degree θ through the value of regulating L can to obtain θ=arcsin.Therefore, to connect a length respectively be L for the M road of the said optical coupler 39 of embodiment of the invention output
i(the light delay unit 40 of 1≤i≤M).Like this, to export corresponding receive direction be θ on the i road of said optical coupler 39
i=arcsin (DL
iThe microwave signal of c Δ λ/d), this system can receive the microwave signal of M different directions simultaneously.And then, through regulating the output Wavelength of Laser of lasing light emitter 37, just regulate Δ λ (Δ λ can be negative), can realize that the scanning to M different directions receives in 180 ° of scopes.
And; The output of each said smooth delay unit 40 connects an independently light input end of photo-detector 41 respectively; Said photo-detector 41 is a microwave signal with the light signal independent translation of N wavelength; And simultaneously the microwave signal after these conversions is carried out the ripple that closes of microwave frequency band, the total microwave signal of electrical signal output through said photo-detector 41 at last, the reception work of completion whole system.
Embodiment two
Fig. 5 is the structural representation of second kind of described light-operated microwave beam receiving system of embodiment of the present invention.As shown in Figure 5, the structure of the said system of this embodiment and first kind of said system of embodiment is basic identical, and its difference only is, said optical coupler 39 is replaced with the combination of a mixer 42 and splitter 43.Said mixer 42 comprises N input and 1 output, is used for said splitter 43 is exported in the N road light signal merging of said optical modulator 38 outputs; Said splitter 43 comprises 1 input and M output, is used to receive the output of said mixer 42, and is re-assigned to M output of said splitter 43.
The described light-operated microwave beam receiving system of the embodiment of the invention; Through adopting the optical modulator of N output different wave length laser; In conjunction with the light signal processing unit, on the light delay unit, form the amount of delay difference naturally, realizing under the situation that M direction microwave signal received simultaneously; The number of light delay unit is reduced to M from N * M, effectively simplified system configuration; Simultaneously, through regulating the wavelength of light carrier, realized the scanning in the 180 degree scopes of plane, antenna element place is received; Through adopting photo-detector, realized that simultaneously opto-electronic conversion and microwave close ripple.To sum up, the embodiment of the invention said system through simple system structure, has satisfied High Data Rate, multi-user's demand, has improved the mobile communication performance.
Above execution mode only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (9)
1. light-operated microwave beam receiving system; It is characterized in that, comprising: N antenna element (36), the independent microwave signal that receives of said antenna element (36); And said antenna element (36) connects the first input end of an optical modulator (38) respectively, and said first input end is an electrical signal ports;
Second input of said optical modulator (38) connects lasing light emitter (37), and said second input is the light signal input port; Said optical modulator (38) receives the microwave signal of said first input end, and according to said microwave signal the laser signal that is got into by said second input is carried out intensity modulated; The light output end of said optical modulator (38) connects the input of a light signal processing unit;
Said light signal processing unit comprises N input and M output, is used to realize the merging of N road light signal, and is re-assigned to a said M output; The M of a said light signal processing unit output connects the input of the different light delay unit (40) of length respectively; Said smooth delay unit (40) is to the amount of delay that the output Wavelength of Laser of adjacent said lasing light emitter (37) is produced at interval, just compensates microwave signal because source direction and the amount of delay that on adjacent said antenna element (36), produced;
The output of said smooth delay unit (40) connects the light input end of a photo-detector (41) respectively; Said photo-detector (41) is used for converting the light signal of N wavelength into microwave signal, and the microwave signal after these conversions is carried out the ripple that closes of microwave frequency band, exports total microwave signal at last.
2. the system of claim 1 is characterized in that, a said N antenna element (36) distributes point-blank, and keeps identical spacing between the adjacent said antenna element (36).
3. the system of claim 1 is characterized in that, the output Wavelength of Laser of said lasing light emitter (37) is adjustable.
4. the system of claim 1 is characterized in that, the output Wavelength of Laser of the lasing light emitter (37) that adjacent said antenna element (36) is corresponding keeps the equiwavelength to increase at interval or reduces.
5. the system of claim 1 is characterized in that, said smooth delay unit (40) reduces with linear the increasing perhaps of optical wavelength variation the amount of delay of light wave.
6. the system of claim 1 is characterized in that, said light signal processing unit adopts optical coupler (39).
7. the system of claim 1 is characterized in that, said light signal processing unit comprises interconnected mixer (42) and splitter (43).
8. the system of claim 1 is characterized in that, said smooth delay unit (40) adopts dispersive optical fiber.
9. like the described system of one of claim 1 to 8, it is characterized in that said optical modulator (38) adopts lithium niobate electrooptic modulator.
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Cited By (7)
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| CN103532604A (en) * | 2013-09-30 | 2014-01-22 | 上海交通大学 | Programmable beam forming network on basis of optical wavelength division multiplexing technology |
| CN103580752A (en) * | 2012-08-07 | 2014-02-12 | 北京邮电大学 | Optical true time delay device and light-operated beam-forming network system |
| CN104901014A (en) * | 2015-06-08 | 2015-09-09 | 南京信息工程大学 | Optical true time delay plane phased array receiving antenna system based on wavelength scanning |
| CN108761439A (en) * | 2018-05-07 | 2018-11-06 | 上海交通大学 | Integrated multi-beam optical phased array delay network based on wavelength-division multiplex |
| CN108957900A (en) * | 2018-06-29 | 2018-12-07 | 西安空间无线电技术研究所 | A kind of multi-beam optical phased array antenna based on silicon substrate |
| CN109975796A (en) * | 2019-04-11 | 2019-07-05 | 清华大学深圳研究生院 | Integrated position measurement and adjustment device and method |
| CN114296033A (en) * | 2021-12-23 | 2022-04-08 | 中国电子科技集团公司第十四研究所 | Light-operated receiving beam forming method and device |
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| CN103580752A (en) * | 2012-08-07 | 2014-02-12 | 北京邮电大学 | Optical true time delay device and light-operated beam-forming network system |
| CN103580752B (en) * | 2012-08-07 | 2016-03-23 | 北京邮电大学 | The true time-delay mechanism of optics and optical controlled beam forming network system |
| CN103532604A (en) * | 2013-09-30 | 2014-01-22 | 上海交通大学 | Programmable beam forming network on basis of optical wavelength division multiplexing technology |
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| CN104901014A (en) * | 2015-06-08 | 2015-09-09 | 南京信息工程大学 | Optical true time delay plane phased array receiving antenna system based on wavelength scanning |
| CN108761439A (en) * | 2018-05-07 | 2018-11-06 | 上海交通大学 | Integrated multi-beam optical phased array delay network based on wavelength-division multiplex |
| CN108957900A (en) * | 2018-06-29 | 2018-12-07 | 西安空间无线电技术研究所 | A kind of multi-beam optical phased array antenna based on silicon substrate |
| CN109975796A (en) * | 2019-04-11 | 2019-07-05 | 清华大学深圳研究生院 | Integrated position measurement and adjustment device and method |
| CN109975796B (en) * | 2019-04-11 | 2021-08-13 | 清华大学深圳研究生院 | Integrated position measuring and adjusting device and method |
| CN114296033A (en) * | 2021-12-23 | 2022-04-08 | 中国电子科技集团公司第十四研究所 | Light-operated receiving beam forming method and device |
| CN114296033B (en) * | 2021-12-23 | 2024-02-27 | 中国电子科技集团公司第十四研究所 | Light-operated receiving beam forming method and device |
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