CN103957093B - Signal stable-phase back transmission system and method based on frequency synchronization - Google Patents
Signal stable-phase back transmission system and method based on frequency synchronization Download PDFInfo
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Abstract
The invention discloses a signal stable-phase back transmission system and method based on frequency synchronization. The system comprises a frequency synthesizer, a microwave power distributor, a phase comparing unit, a light modulation module and a light coupler. The frequency synthesizer is used for generating local oscillating signals by utilizing reference frequency signals reproduced by a frequency transmission system. The microwave power distributor is used for separating first auxiliary compensating signals transmitted by the frequency transmission system to an antenna end. The phase comparing unit is used for converting the frequency of microwave signals received by an antenna into the transmission frequency by utilizing the local oscillating signals and the first auxiliary compensating signals, meanwhile, phase noise which will be introduced in optical fiber link transmission is deducted from the phase of the microwave signals in advance, and pre-compensation signals are obtained. The light modulation module is used for modulating the pre-compensation signals. The light coupler is used for coupling light modulation signals to a compensation receiving device of the frequency transmission system, and the light modulation signals are transmitted to an information center through the optical fiber link transmission. Due to the fact that the phase noise introduced in the transmission process and the phase of pre-compensation are canceled, stable-phase back transmission of the phase information of the microwave signals received by the antenna end to the information center is achieved.
Description
Technical field
The present invention relates to the steady mutually passback technical field of signal is and in particular to a kind of steady phase of signal based on Frequency Synchronization is returned
Pass system and method.
Background technology
Deepening continuously with space research, the design of Deep Space Station and building-up work are constantly carried out all over the world.Deep space
The main task stood be spacecraft to the execution moon, planet and interplanetary exploration task be tracked, remote measurement, navigation and communicating
Deng.The radiofrequency signal phase place that generally earth station antenna receives carries important target information.In order to obtain signal exactly
Phase information, requires there is frequency and the homology of time, synchronism between different receiving devices.Therefore, temporal frequency distribution and letter
Number Transmission system is the basis and guarantee that whole Deep Space Station can normally run, and directly affects the remote measurement precision of spacecraft.
For the mode of multiple antennas joint observing and controlling, the information centre of Deep Space Station system is separated with antenna end, with information
The backup clock group of the heart is time reference, is transmitted the reference frequency signal of information centre to each antenna by frequency Transmission system
End, the clock realizing each antenna end is synchronous；Meanwhile, by many ground sky line locking receive target information, pass back information centre carry out whole
Close.
Present invention applicant another in careful patent " a kind of rearmounted frequency Transmission system of compensation system and method " (patent
Application number：201410141670.5) describe a kind of frequency carrying out phase noise compensation in antenna end realized by optical fiber
Signal transmission system and method, are particularly well-suited to the Frequency Transfer from any to multiple spot, are applied to Deep Space Station system, you can
Realize the Frequency Synchronization of each antenna end.Specific embodiment is as shown in figure 1, reference frequency source and emitter are located at Deep Space Station system
The information centre of system, receives compensation device and is located at antenna end, the reference frequency signal that the reference frequency source of information centre produces, by
Emitter transmits to each antenna end through optical fiber link, by receiving compensation device, the phase noise that transmitting procedure introduces is carried out
Compensate, reappear reference frequency signal, be achieved in the Frequency Synchronization of information centre and antenna end, so realize each antenna end it
Between the homology of frequency and time, synchronism so that the target information that each antenna is obtained accurately integrated with unified.
On the basis of frequency with time synchronized, need passing back of the echo signal accurate stable that each antenna is received
Information centre.Because the distance of different antennae to information centre is different, the environment residing for transmission line is different and continuous in time
Change, the phase noise that each echo signal introduces during passback is difficult to measure, each target letter being received by information centre
Number phase correlation decline, leverage the accuracy of information integration, reduce the remote measurement precision to spacecraft.
Content of the invention
In order to solve the problems referred to above of prior art, the present invention is proposed and a kind of is surely mutually returned based on the signal of Frequency Synchronization
System and method, the phase information comprising in the microwave signal receiving stably is transmitted to information centre.
According to an aspect of the invention, it is provided a kind of steady phase return system of the signal based on Frequency Synchronization, described frequency
Rate is synchronously realized by frequency Transmission system, and this frequency Transmission system includes frequency signal emitter and frequency signal reception compensates
Device, wherein said emitter is placed in information centre, and described reception compensation device is located at antenna end, and described emitter will frequency
Rate signal is transmitted to described reception compensation device, to realize the Frequency Synchronization at described information center and described antenna end.Described letter
Number steady phase return system includes：Frequency synthesizer, for reappearing the reference of information centre using frequency Transmission system in antenna end
Frequency signal generates local oscillation signal, inputs to than facies unit；Microwave power divider, for by frequency Transmission system in antenna end
The the first auxiliary compensation signal from emitter receiving separates a road by certain power ratio (according to actual needs), defeated
Enter to ratio facies unit, this first auxiliary compensation signal is included in the phase noise of optical fiber link transmitting procedure introducing；Ratio facies unit,
For the frequency conversion of microwave signal that antenna passed down using described local oscillation signal, described first auxiliary compensation signal to institute
State the first auxiliary compensation signal identical frequency, its phase place is deducted in advance simultaneously and will introduce in the transmission of above-mentioned optical fiber link
Phase noise, obtains precompensated signal；Optical modulator module, for modulating optical signal by precompensated signal；And photo-coupler,
For described optical signal being coupled to the circulator input of the reception compensation device of antenna end, to be passed by above-mentioned optical fiber link
Transport to information centre.
Optionally, described system is additionally included in microwave power divider and than the microwave power amplifier between facies unit,
Microwave signal for separating microwave power divider carries out suitable power amplification；Than facies unit and optical modulator module it
Between microwave power amplifier, for suitable power amplification will be carried out from the microwave signal exporting than facies unit；In light modulation
Optical amplifier between module and photo-coupler, the optical signal for exporting optical modulator module carries out suitable power and puts
Greatly.
According to a further aspect in the invention, a kind of steady phase retransmission method of signal based on Frequency Synchronization, the party are additionally provided
Method includes：The emitter of frequency Transmission system is placed in information centre, receives compensation device and be placed in antenna end, by information centre
Tranmitting frequency signal, to antenna end, reappears the reference frequency signal of information centre, realizes information centre and antenna end in antenna end
Frequency Synchronization；Using described reproduction reference frequency signal, local oscillation signal is generated by frequency synthesizer, input to than mutually list
Unit；The reception compensation device of antenna end receives the first auxiliary compensation signal of the emitter from information centre, is included in light
The phase noise corresponding with its frequency introducing during fine link transmission, by microwave power divider by this first auxiliary compensation signal
Separate a road to input to than facies unit；Antenna end comprises the microwave signal of phase information from extraneous reception, inputs to than facies unit；
Than facies unit using described local oscillation signal and described first auxiliary compensation signal by the frequency conversion of the microwave signal receiving extremely
With described first auxiliary compensation signal identical frequency, its phase place is deducted in advance simultaneously and will draw in the transmission of above-mentioned optical fiber link
The phase noise entering, obtains precompensated signal；By optical modulator module, described precompensated signal is loaded onto on optical signal, through light
Coupler is coupled to the circulator input receiving compensation device, to be transmitted to information centre by above-mentioned optical fiber link.Due to
Precompensated signal is identical with the first auxiliary compensation signal frequency from emitter receiving compensation device reception, and it is same
The phase noise that the phase noise introducing when transmitting in optical fiber link is also comprised with described first auxiliary compensation signal (is detained in advance
The phase noise removing) identical, two phase noise cancellations in this signal that the heart receives in the information, thus by antenna end from outer
The phase information that boundary receives stably is transmitted to information centre.
Optionally, separate the step of described frequency signal in described microwave power divider after, also include to described frequency
The step that signal carries out suitable power amplification；Described obtain the step of precompensated signal than facies unit after, also include to pre-
The step that thermal compensation signal carries out suitable power amplification；After the step using described precompensated signal modulated optical signal, also wrap
Include the step that the optical signal to optical modulator module output carries out suitable power amplification.
Using the solution of the present invention, by ratio facies unit, comprise light using what local oscillation signal and reception compensation device received
First auxiliary compensation signal of fine link phase noise, the frequency of the microwave signal that antenna end is received from the external world be changed into
Its phase place is deducted simultaneously and is transmitted in above-mentioned optical fiber link and will draw by described first auxiliary compensation signal identical frequency in advance
The phase noise entering, obtains precompensated signal, then is loaded on optical signal, by above-mentioned Optical Fiber Transmission to signal center
Emitter.The microwave signal being achieved in being received from antenna end from the external world mutually returns to the steady of information centre.
Further, since the frequency of local oscillation signal according to the frequency of antenna receiving signal, can be changed, produced by than facies unit
Go out to determine frequency precompensated signal (this frequency with from information centre emitter the first auxiliary compensation signal frequency
Identical), the signal steady phase return system of the present invention can be realized the steady of all frequency band signals and mutually return, and described system has very
High versatility.
Brief description
Fig. 1 shows and is applied to showing of Deep Space Station system for the frequency Transmission system of Frequency Synchronization and signal return system
It is intended to.
Fig. 2 shows the existing frequency Transmission system (number of patent application for Frequency Synchronization：201410141670.5)
Structural representation；
Fig. 3 shows the structural representation of the exemplary embodiments of the signal of the present invention steady phase return system；
Fig. 4 shows that a kind of structure of the ratio facies unit in the exemplary embodiments of the signal of the present invention steady phase return system is shown
It is intended to；
Fig. 5 shows another kind of structure of the ratio facies unit in the exemplary embodiments of the signal of the present invention steady phase return system
Schematic diagram.
Specific embodiment
For making the object, technical solutions and advantages of the present invention of greater clarity, with reference to specific embodiment and join
According to accompanying drawing, the present invention is described in more detail.
Fig. 2 shows the structural representation of the existing frequency Transmission system for Frequency Synchronization.
As shown in Fig. 2 described existing frequency Transmission system includes：Emitter, for producing PGC demodulation in reference
The frequency signal of frequency source, and by this frequency signal modulation to optical signal with by optical fiber to receive compensation device transmission；With
Receive compensation device, for receiving the optical signal from emitter, demodulation obtains the frequency with optical fiber link phase noise
Signal, using this frequency signal as the first auxiliary compensation signal, and generates microwave signal using frequency oscillator, is loaded onto light letter
Transmit to emitter through above-mentioned optical fiber link on number, more emitted device send back reception compensation device demodulating, obtain with
First auxiliary compensation signal contains the second auxiliary compensation signal of same phase noise, based on the first auxiliary compensation signal and second
Auxiliary compensation signal generation phase compensation signal, using this phase compensation signal feedback control said frequencies oscillator output signal
Phase place, reproduction PGC demodulation in the frequency signal of frequency emission source.
Described reception compensation device further includes auxiliary compensation portion and compensation section, and described auxiliary compensation portion further includes
Optical fiber circulator, optical modulator module, wavelength division multiplexer, the first detector and the second detector.
It is assumed that the reference signal that reference frequency source produces is
V0=A0cos(ω0t+φref)
Here, A0Amplitude for reference signal；φrefPhase place for reference signal；ω0Frequency for reference signal.
Emitter produces PGC demodulation
V1=A1cos(aω0t+aφref)
Wherein A1Represent the amplitude of this frequency wave signal；A be Arbitrary Digit, by frequency signal to be transmitted frequency divided by
The frequency of reference signal obtains.
Emitter will pass through Optical Fiber Transmission on this frequency signal modulation to optical signal, is mended by the auxiliary receiving compensation device
The portion that repays receives, and inputs to wavelength division multiplexer through circulator.The phase noise introducing during being somebody's turn to do is assumed to φp, this phase noise
By optical fiber link local environment temperature change, the factor such as change of mechanical stress impact suffered by optical fiber.
The compensation section receiving compensation device produces microwave signal
Wherein, A3Represent the amplitude of this microwave signal；φ0Represent the phase place of this microwave signal.This microwave signal is mended through auxiliary
Repay portion optical modulator module be modulated after, input above-mentioned optical fiber link through circulator and transmit to emitter, more emitted dress
Zhi Yanyuan passes on road reception compensation device back, inputs to wavelength division multiplexer through circulator.Due to the frequency of this microwave signal be by send out
Penetrate the half of the frequency of frequency signal that end is transmitted, the phase noise introducing along during same optical fiber link round-trip transmission
Should be φp.
The optical signal that above-mentioned two-way inputs wavelength division multiplexer is detected through the first detector and second respectively as after wavelength separated
Device is demodulated, and obtains the first auxiliary compensation signal and the second auxiliary compensation signal, input offset portion.This first auxiliary compensation is believed
Number and the form of the second auxiliary compensation signal be：
V2=A2cos(aω0t+aφref+φp)
Wherein, A2Amplitude for the first auxiliary compensation signal；φpThe phase noise (seeing above) introducing for optical fiber link.A4
Represent the amplitude of the second auxiliary compensation signal, the phase noise being introduced by optical fiber link is also φp(seeing above).
It should be noted that input the optical signal of wavelength division multiplexer, its corresponding light modulation for the ease of separating above-mentioned two-way
The optical signal that module is modulated need to have different wavelength, and as far as possible close.
Compensation section utilizes the first auxiliary compensation signal and the second auxiliary compensation signal generation phase compensation signal, using this phase
Position thermal compensation signal feedback control exports to microwave signal V in auxiliary compensation portion3Phase place, thus obtain PGC demodulation sending out in frequency
Penetrate the reproduction reference frequency signal in source, the form of this signal is：
V5=A5cos(ω0t+φref+C)
Wherein, A5For reappearing the amplitude of reference frequency signal；ω0Frequency for reference signal；φrefPhase for reference signal
Position；C is a fixed constant.The reference frequency signal of reproduction and former reference signal have identical frequency, and phase difference C fixes,
The reference frequency signal PGC demodulation reappearing is in reference signal.Because C does not affect on the change of phase place, for the side of statement
Just, can be omitted.The reference frequency signal of reproduction can be simplified shown as：
V5=A5cos(ω0t+φref)
As described above, having obtained PGC demodulation in the reproduction reference of emitter end reference frequency source receiving compensation device
Frequency signal.Emitter and reference frequency source are placed in information centre, are placed in antenna end so that it may in sky by receiving compensation device
Line end obtains PGC demodulation in the reproduction reference frequency signal V of information centre's reference frequency source5, realize information centre and antenna end
Frequency Synchronization.(detailed description of above content is referring in careful patent：201410141670.5.)
Fig. 3 shows typical case's enforcement of the steady phase return system of the signal based on said frequencies Transmission system proposed by the present invention
The structural representation of example.
As shown in figure 3, the emitter of said frequencies Transmission system and reference frequency source are placed in information centre, receive and compensate
Device and signal steady phase return system are placed in antenna end.
With reference to Fig. 3, the steady phase return system of the signal based on said frequencies Transmission system of the present invention includes：Frequency synthesizer
101, for the reproduction reference frequency signal V being generated in antenna end using frequency Transmission system5Generate local oscillation signal V6, input to
Than facies unit 103；Microwave power divider 102, for the first auxiliary compensation letter generating frequency Transmission system in antenna end
Number V2Separate a road by certain power ratio (according to actual needs), input to ratio facies unit 103, the first auxiliary compensation signal
V2It is included in the phase noise that optical fiber link transmission introduces；Ratio facies unit 103, for using described local oscillation signal V6, first auxiliary
Thermal compensation signal V2Microwave signal V that antenna end is received from the external worldrecFrequency conversion to the first auxiliary compensation signal V2Phase
Its phase place is deducted the phase noise that will introduce in the transmission of above-mentioned optical fiber link simultaneously, is pre-compensated for by same frequency in advance
Signal；Optical modulator module 104, for modulating optical signal by precompensated signal；With photo-coupler 105, for by described tune
Optical signal processed be coupled to antenna end reception compensation device optical fiber circulator input, with by above-mentioned optical fiber link transmit to
Information centre.
In figure 3, the microwave signal that signal steady phase return system receives from the external world is expressed as
Vrec=Areccos(ωrect+φrec)
Wherein, ArecAmplitude for receipt signal；φrecPhase place for receipt signal；ωrecFrequency for receipt signal.
It should be noted that high-frequency signal is generally by the microwave signal that antenna end receives from the external world, compare by optical fiber chain
The frequency of the frequency signal of road transmission is higher, so here with ωrecMore than a ω0Situation illustrate, but not limited to this.
Receive the reproduction reference frequency signal V that the compensation section of compensation device generates5Input to signal steady phase return system, warp
Frequency synthesizer 101 generate local oscillation signal be
V6=A6cos(bω0t+bφref)
Wherein, A6Amplitude for local oscillation signal；bω0For the frequency of local oscillation signal, and immobilize, and by than facies unit
103 concrete structure, receipt signal VrecFrequency and the first auxiliary compensation signal V2Frequency uniquely determine (to its assignment
Concrete grammar sees below).
It should be noted that frequency synthesizer 101 can produce PGC demodulation in the optional frequency of reproduction reference frequency signal
Microwave signal.
The first auxiliary compensation signal V that frequency Transmission system is generated by microwave power divider 102 in antenna end2By certain
Power ratio (according to actual needs) separate a road, input to than facies unit 103.
Optionally, according to actual needs, available microwave power amplifier, that microwave power divider 102 is separated
One auxiliary compensation signal V2Carry out a certain degree of power amplification.
Ratio facies unit 103 in the signal steady phase return system of the present invention, for using being generated by frequency synthesizer 101
Local oscillation signal V6Microwave signal V that antenna is passed downrecCarry out frequency-conversion processing, recycling is exported by microwave power divider 102
Part first auxiliary signal V2, the signal after frequency conversion is carried out with the pre- deduction of phase noise, obtains the intermediate frequency passback letter pre-compensating for
Number V8, its frequency and the first auxiliary compensation signal V2Frequency identical, its phase place comprises the phase information that antenna passes down signal, and
Deduct it in advance and transmit, in optical fiber link, the phase noise that will introduce.
Fig. 4 is a kind of structural representation of the ratio facies unit 103 in the signal steady phase return system of the present invention.
In Fig. 4Represent frequency mixer, it makes two input signals do multiplying, and filters high fdrequency component, even if
Obtain the frequency of two signals and phase place does subtraction.
As shown in Figure 4 scheme, described includes frequency mixer 201 and frequency mixer 202 than facies unit 103.Frequency mixer 201 is used for profit
Use local oscillation signal V6, signal V will be passed under antennarecIt is converted to the first auxiliary compensation signal V2The twice of frequency, obtains microwave signal
V7.Frequency mixer 202 is used for using the first auxiliary compensation signal V2, by microwave signal V after frequency conversion7, deduct in advance in optical fiber link
The phase noise that transmission will introduce.
Using passing signal V under antennarecWith local oscillation signal V6It is mixed through frequency mixer 201, achieve a butt joint collection of letters VrecChange
Frequency is processed, and the microwave signal obtaining is：
V7=A7cos[(ωrec-bω0)t+φrec-bφref]
Wherein, A7Amplitude for this microwave signal.
Using microwave signal V7With the first auxiliary compensation signal V2It is mixed through frequency mixer 202, realize the pre- benefit of phase noise
Repay, the precompensated signal obtaining is：
V8=A8cos[(ωrec-bω0-aω0)t+φrec-bφref-aφref-φp]
Wherein, A8For the amplitude of this microwave signal, the phase place of pre- deduction is φp.
In order that precompensated signal V8The phase noise introducing through optical fiber link transmission is identical with the phase place of pre- deduction (all
For φp), and the first auxiliary compensation signal V2Comprising also is φ through the phase noise that the transmission of same optical fiber link introducesp, pre- benefit
Repay signal V8Frequency should be with the first auxiliary compensation signal V2Frequency identical, that is,
ωrec-bω0-aω0=a ω0
Obtain
B=ωrec/ω0-2a
Thus obtaining the local oscillation signal V of frequency synthesizer 101 generation6Frequency b ω0Unique determination value.
Precompensated signal V8It is represented by
V8=A8cos[aω0t+φrec-bφref-φp]
Thus, obtained precompensated signal V by than facies unit 1038, its frequency and the first auxiliary compensation signal V2Frequency
Identical (it is a ω0), its phase place comprises to pass signal V under antenna6Phaserec, and deduct in advance optical fiber link transmission will
The phase noise φ introducingp.
Fig. 5 is another kind of structural representation of the ratio facies unit 103 in the signal steady phase return system of the present invention.
In the signal being mixed due to scheme shown in Fig. 4, frequency mixer 202, microwave signal V7Frequency (2a ω0) it is first
Auxiliary compensation signal V2Frequency (a ω0) twice, after mixing output precompensated signal V8In will comprise this overtones band
(aω0) harmonic components.In order to overcome the impact of this nonlinear effect, scheme as shown in Figure 5 can be adopted than facies unit, bag
Include frequency synthesizer 301, frequency mixer 302, frequency mixer 303 and frequency mixer 304.
The reproduction reference frequency signal life being generated using the compensation section receiving compensation device with reference to Fig. 5, frequency synthesizer 301
Become low frequency local oscillation signal
V9=A9cos(cω0t+cφref)
Wherein, A9Amplitude for low frequency local oscillation signal；C is arbitrary constant, and c<A, c ≠ a/2.(detailed description sees below
Literary composition.)
It should be noted that frequency synthesizer 301 can produce PGC demodulation in the optional frequency of reproduction reference frequency signal
Microwave signal.
By low frequency local oscillation signal V9With the first auxiliary compensation signal V2It is mixed through frequency mixer 302, obtain the tenth microwave signal
Wherein, A10Amplitude for the tenth microwave signal.
It should be noted that the low frequency local oscillation signal V when frequency synthesizer 301 output9Frequency be c ω0=a ω0When/2
(i.e. c=a/2), output signal V of frequency mixer 30210Frequency be (a-c) ω0=a ω0/ 2, the frequency of the two is consistent, mixing
Filtered output signal V10In will comprise input signal V with frequency with it9Composition, therefore it is required that low frequency local oscillation signal V9
Frequency c0≠aω0/ 2, i.e. c ≠ a/2.
Using local oscillation signal V6With the signal V from extraneous receptionrecIt is mixed through frequency mixer 303, realize antenna and pass signal down
Down coversion, obtains the 11st microwave signal
V11=A11cos[(ωrec-bω0)t+φrec-bφref]
Wherein, A11Amplitude for the 11st microwave signal.
Using the tenth microwave signal V10With the 11st microwave signal V11It is mixed through frequency mixer 304, realize the pre- of phase noise
Deduction, obtains precompensated signal
V12=A12cos[(ωrec-aω0-bω0+c0)t+φrec-(a+b-c)φref-φp]
Wherein, A12Amplitude for precompensated signal.
In order that precompensated signal V12Transmit the phase noise that will introduce and the phase place phase of pre- deduction through optical fiber link
(it is φ togetherp), and the first auxiliary compensation signal V2Comprising also is φ through the phase noise that the transmission of same optical fiber link introducesp,
This precompensated signal V12Frequency should be with the first auxiliary compensation signal V2Frequency identical, that is,
ωrec-aω0-bω0+cω0=a ω0
Obtain
B=ωrec/ω0-2a+c
Thus obtaining the local oscillation signal V of frequency synthesizer 101 generation6Frequency b ω0Unique determination value.
Thus precompensated signal V12It is represented by
Thus, precompensated signal V obtaining12Precompensated signal V obtaining with scheme described in Fig. 48There is identical frequency
And phase place, its frequency all with the first auxiliary compensation signal V2Frequency identical (be a ω0), its phase place all comprises to pass letter under antenna
Number V6Phaserec, and deduct the phase noise φ that will introduce in optical fiber link transmission in advancep.
It should be noted that what the method for work of the ratio facies unit shown in Fig. 4 and Fig. 5 was merely exemplary, do not constitute to this
The restriction of invention.
In addition, in practical application, can be according to passing signal V under antennarecFrequency, the first auxiliary compensation signal V2Frequency
Determine the concrete structure than facies unit 103 in the present invention, thus uniquely determining the local oscillator that medium frequency synthesizer 101 of the present invention generates
Signal V6Frequency and phase place, carry out frequency-conversion processing using local oscillation signal to passing signal under antenna, with obtain determine frequency pre-
Thermal compensation signal.
Described precompensated signal is loaded onto on optical signal optical modulator module 104, is coupled to antenna end through photo-coupler 105
Frequency signal reception compensation device optical fiber circulator input, to be transmitted to information centre by same optical fiber link.
Optionally, microwave power amplifier can be added between facies unit 103 and optical modulator module 104 in ratio, for will be from
Carry out suitable power amplification than the microwave signal of facies unit 103 output.
Optionally, optical amplifier can be added between optical modulator module 104 and photo-coupler 105, for by light modulation
The optical signal of module 104 output carries out suitable luminous power and amplifies.
Photo-coupler 105 of the present invention is used for for two ways of optical signals synthesis leading up to same Optical Fiber Transmission.Optional
, the methods such as wavelength division multiplexer can be adopted to realize this function, not in the row of the discussion of the present invention.
It should be noted that this optical modulator module 104 output through precompensated signal V8(V12) optical signal modulated, with frequency
Signal receives the 3rd microwave signal V generating in compensation device3The optical signal of modulation, by same circulator through same fibre chain
Road is transmitted to information centre, and therefore described two ways of optical signals should have different wavelength, in order to the heart in the information by two-way light
Signal separator.
The heart receives described two ways of optical signals by emitter in the information, and available wavelength division multiplexer is according to its optical wavelength
Difference carry out separating, to being loaded with precompensated signal V8(V12) optical signal be demodulated, due to precompensated signal V8(V12)
With the first auxiliary compensation signal V2Frequency identical, the phase noise that it introduces when transmitting in same optical fiber link also should be identical
(it is φp, namely the phase noise deducted in advance), two phase place noise cancellation, thus the signal that heart demodulation obtains in the information
For
V13=A13cos[aω0t+φrec-bφref]
Wherein, A13Amplitude for this signal.
From above formula, in the signal that information centre receives, completely remain the phase from the extraneous signal receiving for the antenna end
Position information φrec, and eliminate the phase noise of fiber transmission link introducing.Thus that antenna end is steady from the extraneous information receiving
Surely transmit to information centre.
In sum, the signal of the present invention steady phase return system, using existing frequency Transmission system connecing in antenna end
Receive the reference frequency signal of compensation device reproduction, and its first auxiliary compensation signal generating, the microwave signal that antenna is passed down
Carry out frequency-conversion processing, its phase place is deducted the phase noise that will introduce in optical fiber link transmission in advance, to obtain pre- benefit simultaneously
Repay signal, then modulated on optical signal, transmitted to information centre by the optical fiber link used by frequency Transmission system, through solution
Tune can obtain the phase information of the microwave signal of antenna end reception, and eliminates the phase noise that fiber transmission link introduces,
The signal being achieved in being received from antenna end mutually returns to the steady of information centre.
Present invention also offers a kind of steady phase retransmission method of the signal based on Frequency Synchronization, the method is passed through presented hereinbefore
Signal steady phase return system is implemented.
Signal based on the Frequency Synchronization steady phase retransmission method of the present invention includes step：Transmitting dress by frequency Transmission system
It is placed in information centre, receive compensation device and be placed in antenna end, by information centre's tranmitting frequency signal to antenna end, in antenna end
The reference frequency signal of reproduction information centre, realizes the Frequency Synchronization of information centre and antenna end；By frequency synthesizer 101 profit
Generate local oscillation signal with the reference frequency signal of described reproduction, input to than facies unit 103；Reception compensation device in antenna end
Receive the first auxiliary compensation signal of the emitter from information centre, be included in the phase place introducing during optical fiber link transmission and make an uproar
This signal is separated a road by microwave power divider 102 and inputs to than facies unit 103 by sound；Antenna end comprises from extraneous reception
The microwave signal of phase information, inputs to than facies unit 103；Utilize described local oscillation signal and described first auxiliary than facies unit 103
Help the frequency conversion of the microwave signal that antenna passes down by thermal compensation signal to the first auxiliary compensation signal identical frequency, will simultaneously
Its phase place deducts the phase noise that will introduce in the transmission of above-mentioned optical fiber link in advance, obtains precompensated signal；By light modulation
Described precompensated signal is loaded onto on optical signal module 104；Described modulated optical signal is coupled to antenna end by photo-coupler
Receive the circulator input of compensation device, to transmit to information centre by above-mentioned optical fiber link；The heart receives and adds in the information
Carry the optical signal of precompensated signal and by receiving other optical signals that compensation device transmits, using wavelength division multiplexer according to its light
The difference of wavelength isolates the optical signal being loaded with precompensated signal, and is demodulated, due to deducting in advance before being transmitted
The phase noise being introduced by optical fiber link transmission, does not comprise described noise in the phase place of the demodulated signal obtaining after transmission, thus
The phase information realizing antenna end receipt signal mutually returns to the steady of information centre.Each device architecture involved by the method and work
Make principle to have been described in above in conjunction with the explanation of Fig. 1-5, will not be described here.
Optionally, separate the step of described first auxiliary compensation signal in described microwave power divider after, it is right also to include
The step that described first auxiliary compensation signal carries out suitable power amplification；In the described step obtaining precompensated signal than facies unit
After rapid, also include the step that suitable power amplification is carried out to precompensated signal；Using described precompensated signal modulation light letter
Number step after, also include the optical signal step that carries out suitable power amplification to optical modulator module output.
In sum, it is contemplated that protecting a kind of steady phase return system of signal based on Frequency Synchronization and method, this
Bright technical scheme has significant technique effect, that is, by signal proposed by the present invention steady phase return system, using existing
Frequency Transmission system, carries out the precompensation of phase noise, recycles described frequency to antenna end from the extraneous microwave signal receiving
Networks of Fiber Communications used by Transmission system, as the transmission medium of signal, precompensated signal is transmitted to information centre, eliminates
Transmitting procedure introduces the interference of phase noise, and the signal realizing being received from antenna end from the external world returns to the steady phase of information centre
Pass, and can continuously run for a long time.
It should be appreciated that the above-mentioned specific embodiment of the present invention is used only for exemplary illustration or explains the present invention's
Principle, and be not construed as limiting the invention.Therefore, that is done in the case of without departing from the spirit and scope of the present invention is any
Modification, equivalent, improvement etc., should be included within the scope of the present invention.Additionally, claims purport of the present invention
Covering the whole changes falling in scope and border or the equivalents on this scope and border and repair
Change example.
Claims (4)
1. the steady phase return system of a kind of signal based on Frequency Synchronization, described Frequency Synchronization is realized by frequency Transmission system, this frequency
Rate Transmission system includes frequency signal emitter and frequency signal reception compensation device, and wherein said emitter is located at information
Center, described reception compensation device is located at antenna end, and frequency signal is transmitted to described reception compensation device by described emitter,
To realize the Frequency Synchronization at described information center and described antenna end, the steady phase return system of described signal includes：
Frequency synthesizer (101), for reappearing the reference frequency signal life of information centre using frequency Transmission system in antenna end
Become local oscillation signal, input to than facies unit (103)；
Microwave power divider (102), for the transmitting dress from information centre receiving frequency Transmission system in antenna end
The the first auxiliary compensation signal put separates a road, inputs to ratio facies unit (103), and this first auxiliary compensation signal is included in optical fiber
The phase noise corresponding with its frequency that link transmission introduces；
Ratio facies unit (103), for using described local oscillation signal, described first auxiliary compensation signal through microwave power divider
(102) export is separated out Na mono- road signal, the frequency conversion of the microwave signal that antenna end is received from the external world to institute
State the first auxiliary compensation signal identical frequency, its phase place is deducted in advance simultaneously and will introduce in the transmission of above-mentioned optical fiber link
Phase noise, obtains precompensated signal；
Optical modulator module (104), for modulating optical signal by precompensated signal；And
Photo-coupler (105), the optical signal for exporting optical modulator module (104) is coupled to connecing of described frequency Transmission system
Receive compensation device circulator input, with by above-mentioned Optical Fiber Transmission to information centre.
2. the steady phase return system of signal according to claim 1 is it is characterised in that this system also includes：
It is connected to microwave power divider (102) and microwave power amplifier between facies unit (103) for the ratio, for by microwave work(
The described first auxiliary compensation signal that rate distributor (102) separates carries out power amplification；
It is connected to microwave power amplifier between facies unit (103) and optical modulator module (104) for the ratio, for facies unit will be compared
(103) microwave signal exporting carries out power amplification；
It is connected to the optical amplifier between optical modulator module (104) and photo-coupler (105), for by optical modulator module
(104) optical signal exporting carries out power amplification.
3. a kind of steady phase retransmission method of the signal based on Frequency Synchronization is it is characterised in that methods described includes：
The emitter of frequency Transmission system is placed in information centre by 3.1, receives compensation device and is placed in antenna end, by information centre
Tranmitting frequency signal, to antenna end, reappears the reference frequency signal of information centre, realizes information centre and antenna end in antenna end
Frequency Synchronization；
3.2 generate local oscillation signal in antenna end by the reference frequency signal that frequency synthesizer (101) utilizes described reproduction；
3.3 antenna end reception compensation device receive from information centre emitter the first auxiliary compensation signal, its
The phase noise corresponding with its frequency that introduce when being included in optical fiber link transmission, by microwave power divider (102) by this
One auxiliary compensation signal separates a road and inputs to than facies unit (103)；
3.4 antenna end comprise the microwave signal of phase information from extraneous reception, input to than facies unit (103)；
3.5 utilize described local oscillation signal and described first auxiliary compensation signal through microwave power divider than facies unit (103)
(102) export is separated out Na mono- road signal, by the frequency conversion of this microwave signal to described first auxiliary compensation signal
Its phase place is deducted the phase noise that will introduce in the transmission of above-mentioned optical fiber link simultaneously, is obtained pre- benefit by identical frequency in advance
Repay signal；
3.6 by optical modulator module (104), described precompensated signal are loaded onto on optical signal；
The optical signal that optical modulator module (104) exports is coupled to frequency Transmission system in antenna end by 3.7 photo-couplers (105)
Receive the circulator input of compensation device, to transmit to information centre by above-mentioned optical fiber link；
3.8 in the information the heart receive in described optical signal and described frequency Transmission system by receiving other light that compensation device transmits
Signal, differentiates each road optical signal using wavelength division multiplexer according to the difference of its optical wavelength, the light letter that steady phase return system is transmitted
Number it is demodulated, due to having deducted the phase noise being introduced by optical fiber link transmission before being transmitted in advance, the demodulation letter that obtains
Number phase place in do not comprise described noise, thus the phase information realizing antenna end receipt signal is returned to the steady phase of information centre
Pass.
4. the steady phase retransmission method of signal according to claim 3 is it is characterised in that methods described also includes：
After described first auxiliary compensation signal is separated the step on a road by described microwave power divider (102), to described
One auxiliary compensation signal separates, through microwave power divider (102), the step that Na mono- tunnel carries out suitable power amplification；
Described obtain the step of precompensated signal than facies unit (103) after, suitable power amplification is carried out to precompensated signal
Step；
After the step using described precompensated signal modulated optical signal, the optical signal that optical modulator module (104) is exported is carried out
The step of suitable power amplification.
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| CN108011667B (en) * | 2017-11-28 | 2020-04-07 | 中国科学院国家授时中心 | Frequency conversion compensation microwave frequency transmission system and method |
| CN110601762A (en) * | 2019-09-18 | 2019-12-20 | 成都同相科技有限公司 | Radio frequency signal transmission method and system for realizing phase noise compensation |
| CN111562568B (en) * | 2020-04-30 | 2022-05-24 | 北京卫星信息工程研究所 | Radar transmitting end, receiving end, frequency synchronization method and transceiving networking radar |
| CN111756446A (en) * | 2020-05-19 | 2020-10-09 | 清华大学 | Phase absolute synchronization system and method based on optical fiber transmission |
| CN112671457B (en) * | 2020-12-03 | 2022-11-22 | 北京无线电计量测试研究所 | Double-base-station radar reference frequency synchronization system and method |
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