CN110365401A - Telecommunication satellite retransmission unit and its retransmission method based on Microwave photonics - Google Patents
Telecommunication satellite retransmission unit and its retransmission method based on Microwave photonics Download PDFInfo
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- CN110365401A CN110365401A CN201910749932.9A CN201910749932A CN110365401A CN 110365401 A CN110365401 A CN 110365401A CN 201910749932 A CN201910749932 A CN 201910749932A CN 110365401 A CN110365401 A CN 110365401A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2210/00—Indexing scheme relating to optical transmission systems
- H04B2210/006—Devices for generating or processing an RF signal by optical means
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Abstract
The present invention provides a kind of telecommunication satellite retransmission unit based on Microwave photonics, including optical modulator module, local oscillator generates and feed module, frequency-variable module, Switching Module and photoelectric conversion and amplification module, the input terminal of the optical modulator module is connected with satellite earth antenna subsystem, the output end of the optical modulator module is generated with the local oscillator and the output end of feed module is connect with the input terminal of the frequency-variable module, the output end of the frequency-variable module is connected with the input terminal of the Switching Module, the output end of the Switching Module is connected with the input terminal of the photoelectric conversion and amplification module, the output end of the photoelectric conversion and amplification module is connected with satellite transmitting antenna subsystem.Telecommunication satellite retransmission unit based on Microwave photonics of the invention overcomes high frequency bring electronic bottleneck using a variety of microwave photon technologies, realizes to the transparent forwarding of signal of communication, has the advantages that low-loss, big bandwidth, multichannel.
Description
Technical field
The present invention relates to microwave photon technologies, are used for satellite communication system, and in particular, to one kind is based on Microwave photonics
Telecommunication satellite retransmission unit and its retransmission method.
Background technique
Transponder is the part that relaying action is directly played in telecommunication satellite.Basic demand to transponder is: with the smallest
Additional noise and distortion, and with enough working frequency range and output power come for each earth station efficiently and reliably repeater satellite believe
Number.Transparent Transponder receives the signal that ground is sent, and does not make any place in addition to carrying out low noise amplification, frequency conversion and power amplification
Reason, only simple to complete forwarding task, it is all the access of " transparent " to any signal in working band；" processing " transponder removes
It is forwarded outside signal, also there is signal processing function.
Signal processing on star mainly includes that demodulation regeneration and other signal transformation and processing are carried out to signal, as above
Row FDMA becomes downlink TDMA signal, further includes switch on star and handle to signal in multi-beam communication.
Application No. is the Chinese invention patents of CN201510321452.4 to disclose a kind of light of Technology for Spatial Information System network
With Microwave Hybrid Transmission system.The present invention includes ground R-T unit and satellite R-T unit.Ground R-T unit includes on the ground
Light and microwave signal emission system, glazing and microwave signal receive system, ground pointing subsystem, ground pointing subsystem divides
Not by microwave decision signal and light emitting antenna attitude adjustment signal respectively come control ground glazing and microwave signal transmitting system
System and ground glazing and microwave signal receive system；Satellite R-T unit includes satellite glazing to be turned with the reception of microwave signal and exchanging
Pointing subsystem in transmitting apparatus, satellite glazing and microwave signal emission system, satellite, on satellite pointing subsystem respectively with satellite
It glazing and the reception of microwave signal and exchanges retransmission unit, satellite glazing and is connect with microwave signal emission system.But the system compared with
For complexity.
Therefore, it is necessary to provide a kind of flexibility with microwave communication and optic communication low-loss, it is able to solve on star
Microwave and two kinds of systems of laser communication simultaneously deposit bring information and merge problem, can preferably adapt to the base of satellite communication system development
In the telecommunication satellite retransmission unit and its retransmission method of Microwave photonics.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of telecommunication satellites based on Microwave photonics to turn
Transmitting apparatus and its retransmission method.
A kind of telecommunication satellite retransmission unit based on Microwave photonics provided according to the present invention, including optical modulator module,
Local oscillator generation and feed module, frequency-variable module, Switching Module and photoelectric conversion and amplification module.
The input terminal of the optical modulator module is connected with satellite earth antenna subsystem, the output of the optical modulator module
It holds and is connect with the input terminal of the frequency-variable module with the output end of local oscillator generation and feed module, the frequency-variable module
Output end is connected with the input terminal of the Switching Module, the output end of the Switching Module and the photoelectric conversion and amplification mould
The input terminal of block is connected, and the output end of the photoelectric conversion and amplification module is connected with satellite transmitting antenna subsystem.
Further, the optical modulator module includes optical modulator and laser, and the local oscillator generates and feed module packet
Optical modulator, laser, microwave source, optical fiber, fiber grating and luminous-power distributor are included, the frequency-variable module includes light modulation
Device, the Switching Module include photoswitch, and the photoelectric conversion and amplification module include photodetector and microwave power amplification
Device.
Correspondingly, the present invention also provides a kind of retransmission method of telecommunication satellite based on Microwave photonics, including it is as follows
Step:
Step 1, the receiving antenna of telecommunication satellite receives multichannel microwave signal, is sent into frequency-variable module after light modulation；
Step 2, the high-frequency local oscillation signal that local oscillator generates and feed module generates is fed to frequency-variable module to modulated optical signal
It is modulated again, realizes the frequency-conversion processing to signal；
Step 3, signal needs the microwave signal sent by after light crosspoint, carrying out photoelectric conversion, generation,
Step 4, microwave signal is amplified by microwave amplifier, is input to telecommunication satellite transmitting antenna.
Further, the light modulation in the step 1 is completed by optical modulator, and the front end of transponder passes through cable on star
Satellite earth antenna subsystem is connected, the road the N microwave signal that telecommunication satellite receives is obtained, signal is defeated after front-end low-noise amplifies
Enter the prevention at radio-frequency port of modulator, the light input of N number of modulator is the different wave length optical signal of N number of laser output.
Further, the method that the local oscillator in the step 2 generates and feed module generates high-frequency local oscillation signal, including such as
Lower step:
Step 2.1, phase noise characteristic low frequency microwave signal is generated by microwave source；
Step 2.2, the microwave signal of the low frequency is modulated on light carrier by Mach-Zehnder modulators, by setting
The bias voltage applied on the modulator is set, sideband signals are controlled；
Step 2.3, optical carrier is filtered out, realizes the generation of frequency-doubled signal.
Further, the conversion method of the frequency-variable module in the step 2 are as follows: by high-frequency local oscillation signal and modulated optical signal
Mach-Zehnder modulators are inputted, the modulated optical signal of input is modulated again, realize signal frequency conversion.
Further, the method for the light crosspoint photoelectric conversion in the step 3 is by high-speed optical switch, completion pair
The road the N wavelength of optical signal Route Selection of input.
Further, system carries out photoelectric conversion to the optical signal exchanged through Wavelength routing using photodetector, generates
Frequency converted microwave signal carries out power amplification by microwave amplifier, is input to telecommunication satellite transmitting antenna and is sent out
It send.
Compared with prior art, the present invention have it is following the utility model has the advantages that
(1) retransmission method of the telecommunication satellite of the invention based on Microwave photonics uses a variety of microwave photon technologies,
Electronic bottleneck brought by high frequency can be overcome, realize the transparent forwarding to signal of communication, there is low-loss, big bandwidth, multi-pass
The characteristics of road；
(2) retransmission method of the telecommunication satellite of the invention based on Microwave photonics, microwave photon technology have micro- simultaneously
The flexibility and optic communication low-loss of wave communication, big superiority bandwidth solve two kinds of systems of microwave and laser communication on star and deposit
Bring information merges problem, can preferably adapt to satellite communication system to high band, big bandwidth, multichannel development.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the schematic diagram that the present invention realizes the telecommunication satellite repeater system based on Microwave photonics；
Fig. 2 is the flow chart that the present invention realizes the telecommunication satellite repeater system based on Microwave photonics.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
Embodiment 1
The embodiment of the invention provides a kind of telecommunication satellite retransmission unit based on Microwave photonics, including light modulation mould
Block, local oscillator generation and feed module, frequency-variable module, Switching Module and photoelectric conversion and amplification module.
The input terminal of the optical modulator module is connected with satellite earth antenna subsystem, the output of the optical modulator module
It holds and is connect with the input terminal of the frequency-variable module with the output end of local oscillator generation and feed module, the frequency-variable module
Output end is connected with the input terminal of the Switching Module, the output end of the Switching Module and the photoelectric conversion and amplification mould
The input terminal of block is connected, and the output end of the photoelectric conversion and amplification module is connected with satellite transmitting antenna subsystem.
The optical modulator module includes optical modulator and laser,
The local oscillator generates and feed module includes optical modulator, laser, microwave source, optical fiber, fiber grating and light function
Rate distributor, the frequency-variable module include optical modulator, and the Switching Module includes photoswitch, the photoelectric conversion and amplification mould
Block includes photodetector and microwave power amplifier.
Embodiment 2
On the basis of embodiment 1, turn the embodiment of the invention provides a kind of telecommunication satellite based on Microwave photonics
Forwarding method includes the following steps:
Step 1, the receiving antenna of telecommunication satellite receives multichannel microwave signal, is sent into frequency-variable module after light modulation；
Step 2, the high-frequency local oscillation signal that local oscillator generates and feed module generates is fed to frequency-variable module to modulated optical signal
It is modulated again, realizes the frequency-conversion processing to signal；
Step 3, signal needs the microwave signal sent by after light crosspoint, carrying out photoelectric conversion, generation,
Step 4, microwave signal is amplified by microwave amplifier, is input to telecommunication satellite transmitting antenna.
Light modulation in the step 1 is completed by optical modulator, and the front end of transponder passes through cable connection satellite on star
Receiving antenna subsystem obtains the road the N microwave signal that telecommunication satellite receives, signal input modulator after front-end low-noise amplifies
Prevention at radio-frequency port, N number of modulator light input be N number of laser output different wave length optical signal.
The method that local oscillator in the step 2 generates and feed module generates high-frequency local oscillation signal, includes the following steps:
Step 2.1, phase noise characteristic low frequency microwave signal is generated by microwave source；
Step 2.2, the microwave signal of the low frequency is modulated on light carrier by Mach-Zehnder modulators, by setting
The bias voltage applied on the modulator is set, sideband signals are controlled；
Step 2.3, optical carrier is filtered out, realizes the generation of frequency-doubled signal.
The conversion method of frequency-variable module in the step 2 are as follows: high-frequency local oscillation signal and modulated optical signal are inputted into Mach-
Zeng Deer modulator modulates the modulated optical signal of input again, realizes signal frequency conversion.
The method of light crosspoint photoelectric conversion in the step 3 is to complete the road N to input by high-speed optical switch
Wavelength of optical signal Route Selection.
System carries out photoelectric conversion to the optical signal exchanged through Wavelength routing using photodetector, generates frequency converted
Microwave signal, by microwave amplifier carry out power amplification, be input to telecommunication satellite transmitting antenna and sent.
More specifically, Fig. 1-2 is please referred to.As shown in Figure 1, satellite repeater system of the invention include by optical modulator,
The optical modulator module of laser source composition, by optical modulator, laser source, microwave source, fiber grating, luminous-power distributor and optical fiber group
At local oscillator generate and feed module, the frequency-variable module being made of optical modulator, the Switching Module being made of photoswitch, by photoelectricity
The photoelectric conversion and amplification module of detector, microwave power amplifier composition.Implementing specific steps with technical solution of the present invention is
Under the premise of carry out, provide detailed embodiment and specific operating process here, as shown in Figure 2.
Communication satellite system based on microwave photon technology includes multiple radio frequency systems, and modulation system is possibly different from,
Such as BPSK, QPSK, 8PSK, the modulation system of 16QAM or higher order.Microwave photon technology contacted microwave signal and optical signal
Two kinds of signal systems, microwave signal realizes various modulation systems as original information carrier, in electrical domain, and optical signal is as star
The medium of upper signal frequency frequency conversion, feeding and exchange, all original electrical domain characteristics to signal are transparent.The present invention is logical first
Crossing the wavelength that the multichannel microwave signal received (road N) is modulated at N number of laser output by optical modulator respectively is λi(i=1,
2 ..., N) light carrier on, at this moment the frequency spectrum of microwave signal is shifted to central wavelength lambdaiNear, and spectral shape is kept not
Become, the optical signal obtained after modulation is sent into frequency-variable module.
Microwave source generates the more excellent low frequency microwave signal of phase noise characteristic, and the microwave signal of the low frequency is passed through
Mach-Zehnder modulators are modulated on light carrier, by the way that the bias voltage applied on the modulator is rationally arranged, control sideband
The going or staying of signal is on this basis filtered out optical carrier using fiber grating, utilizes the sideband signals beat frequency remained
It realizes the generation of frequency-doubled signal, is frequency conversion then by being divided into the road N through power splitter at fiber-fed to transponder converter unit
Unit provides high-frequency local oscillation signal.The local oscillation signal of all converter units comes from same local oscillator generation module, real system in Fig. 1
There can be multiple local oscillator generation modules, realize the purpose that multiple local oscillation signals generate.In addition, local oscillator generation module is in satellite communication
Local oscillator can be not only provided in system for transponder, whole star the place of local oscillation signal in need can pass through optical fiber and realize feedback
It send, realizes the unification of whole star local vibration source.
After completing above-mentioned two parts content, obtained high-frequency local oscillation signal is transported to each modulator of frequency-variable module, right
The modulated optical signal of input is modulated again, realizes signal frequency conversion processing；Then light crosspoint utilizes high-speed optical switch, is based on light
Wavelength exchange, realizes the function to the road the N wavelength of optical signal Route Selection of input, completes the light exchange of high speed on star, multichannel；
Then photoelectric conversion is carried out to the optical signal exchanged through Wavelength routing using photodetector, generates the completion frequency for needing to send
The microwave signal of transformation carries out power amplification through microwave power amplifier, finally enters telecommunication satellite transmitting antenna and is sent out
It send.
To sum up, the retransmission method of the telecommunication satellite of the invention based on Microwave photonics uses a variety of microwave photon skills
Art can overcome electronic bottleneck brought by high frequency, realize the transparent forwarding to signal of communication, have low-loss, big bandwidth, more
The characteristics of channel；Microwave photon technology has the flexibility and optic communication low-loss, big superiority bandwidth of microwave communication simultaneously, solves
Microwave and laser communication two kinds of systems and deposit bring information on star and merge problem, can preferably adapt to satellite communication system to
High band, big bandwidth, multichannel development.
In the description of the present application, it is to be understood that term " on ", "front", "rear", "left", "right", " is erected at "lower"
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is orientation based on the figure or position
Relationship is set, description the application is merely for convenience of and simplifies description, rather than the device or element of indication or suggestion meaning are necessary
It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as the limitation to the application.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (8)
1. a kind of telecommunication satellite retransmission unit based on Microwave photonics, which is characterized in that generated including optical modulator module, local oscillator
And feed module, frequency-variable module, Switching Module and photoelectric conversion and amplification module.
The input terminal of the optical modulator module is connected with satellite earth antenna subsystem, the output end of the optical modulator module with
The local oscillator generates and the output end of feed module is connect with the input terminal of the frequency-variable module, the output of the frequency-variable module
End is connected with the input terminal of the Switching Module, the output end of the Switching Module and the photoelectric conversion and amplification module
Input terminal is connected, and the output end of the photoelectric conversion and amplification module is connected with satellite transmitting antenna subsystem.
2. the telecommunication satellite retransmission unit according to claim 1 based on Microwave photonics, which is characterized in that the light tune
Molding block includes optical modulator and laser,
The local oscillator generates and feed module includes optical modulator, laser, microwave source, optical fiber, fiber grating and optical power point
Orchestration, the frequency-variable module include optical modulator, and the Switching Module includes photoswitch, the photoelectric conversion and amplification module packet
Include photodetector and microwave power amplifier.
3. a kind of retransmission method of the telecommunication satellite based on Microwave photonics, which comprises the steps of:
Step 1, the receiving antenna of telecommunication satellite receives multichannel microwave signal, is sent into frequency-variable module after light modulation；
Step 2, the high-frequency local oscillation signal that local oscillator generates and feed module generates is fed to frequency-variable module and carries out to modulated optical signal
It modulates again, realizes the frequency-conversion processing to signal；
Step 3, signal needs the microwave signal sent by after light crosspoint, carrying out photoelectric conversion, generation,
Step 4, microwave signal is amplified by microwave amplifier, is input to telecommunication satellite transmitting antenna.
4. the retransmission method of the telecommunication satellite according to claim 3 based on Microwave photonics, which is characterized in that the step
Light modulation in rapid 1 is completed by optical modulator, and the front end of transponder passes through cable connection satellite earth antenna subsystem on star,
The road the N microwave signal that telecommunication satellite receives is obtained, the prevention at radio-frequency port of signal input modulator after front-end low-noise amplifies is N number of
The light input of modulator is the different wave length optical signal of N number of laser output.
5. the retransmission method of the telecommunication satellite according to claim 4 based on Microwave photonics, which is characterized in that the step
The method that local oscillator in rapid 2 generates and feed module generates high-frequency local oscillation signal, includes the following steps:
Step 2.1, phase noise characteristic low frequency microwave signal is generated by microwave source；
Step 2.2, the microwave signal of the low frequency is modulated on light carrier by Mach-Zehnder modulators, is applied by setting
Add bias voltage on the modulator, controls sideband signals；
Step 2.3, optical carrier is filtered out, realizes the generation of frequency-doubled signal.
6. the retransmission method of the telecommunication satellite according to claim 5 based on Microwave photonics, which is characterized in that the step
The conversion method of frequency-variable module in rapid 2 are as follows: high-frequency local oscillation signal and modulated optical signal are inputted into Mach-Zehnder modulators,
The modulated optical signal of input is modulated again, realizes signal frequency conversion.
7. the retransmission method of the telecommunication satellite according to claim 3 based on Microwave photonics, which is characterized in that the step
The method of light crosspoint photoelectric conversion in rapid 3 is to complete to route the road the N wavelength of optical signal of input by high-speed optical switch
Selection.
8. the retransmission method of the telecommunication satellite according to claim 7 based on Microwave photonics, which is characterized in that system makes
Photoelectric conversion is carried out to the optical signal exchanged through Wavelength routing with photodetector, generates frequency converted microwave signal, is led to
It crosses microwave amplifier and carries out power amplification, be input to telecommunication satellite transmitting antenna and sent.
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| CN115642961A (en) * | 2021-11-03 | 2023-01-24 | 军事科学院***工程研究院网络信息研究所 | Satellite communication load based on microwave photons |
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