CN103957093A - 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
What the present invention relates to signal surely returns technical field mutually, is specifically related to the steady phase return system of a kind of signal based on Frequency Synchronization and method.
Background technology
Along with deepening continuously of space research, the design and establishing of Deep Space Station is operated in all over the world constantly to be carried out.The main task of Deep Space Station is that the spacecraft of the moon, planet and interplanetary exploration task is followed the tracks of, remote measurement to carrying out, navigation with communicate by letter etc.Conventionally the radiofrequency signal phase place that earth station antenna receives is being carried important target information.In order to obtain exactly signal phase information, between different receiving equipments, require to have homology, the synchronism of frequency and time.Therefore, temporal frequency distribution and signal transmission system are basis and the guarantees that whole Deep Space Station can normally move, and directly affect the remote measurement precision of spacecraft.
Mode for many antennas associating observing and controlling, information centre and the antenna end of Deep Space Station system are separated, the punctual clock group of information centre of take is time reference, by frequency transmission system, the reference frequency signal of information centre is transferred to each antenna end, realizes the clock synchronous of each antenna end; Meanwhile, how by, day line locking receiving target information, passes information centre back and integrates.
Another of the present patent application people examine patent " a kind of frequency transmission system and method for bucking-out system postposition " (number of patent application: 201410141670.5) introduced a kind of by optical fiber, realize in antenna end, carry out frequency signal transmission system and the method for phase noise compensation, be specially adapted to Frequency Transfer to multiple spot by a bit, be applied to Deep Space Station system, can realize the Frequency Synchronization of each antenna end.Embodiment as shown in Figure 1, reference frequency source and emitter are positioned at the information centre of Deep Space Station system, receive compensation arrangement and be positioned at antenna end, the reference frequency signal that the reference frequency source of information centre produces, by emitter, through optical fiber link, transfer to each antenna end, by receiving compensation arrangement, the phase noise of transmitting procedure introducing is compensated, reproduction reference frequency signal, realize thus the Frequency Synchronization of information centre and antenna end, and then realize frequency between each antenna end and the homology of time, synchronism, so that the target information that each antenna is obtained is integrated and unification accurately.
On the basis of frequency and time synchronized, need to by each antenna reception to echo signal accurate stable pass information centre back.Because different antennae is different to the distance of information centre, the residing environment difference of transmission line and constantly variation in time, the phase noise that each echo signal is introduced in passback process is difficult to measure, the phase correlation of each echo signal being received by information centre declines, greatly affect the accuracy that information is integrated, reduced the remote measurement precision to spacecraft.
Summary of the invention
In order to solve the problems referred to above of prior art, the present invention proposes the steady phase return system of a kind of signal based on Frequency Synchronization and method, by the phase information stable transfer comprising in the microwave signal receiving to information centre.
According to an aspect of the present invention, provide a kind of signal based on Frequency Synchronization steady phase return system, described Frequency Synchronization is realized by frequency transmission system, this frequency transmission system comprises that frequency signal emitter and frequency signal receive compensation arrangement, wherein said emitter is placed in information centre, described reception compensation arrangement is positioned at antenna end, and described emitter is transmitted to described reception compensation arrangement by frequency signal, to realize the Frequency Synchronization of described information centre and described antenna end.The steady phase return system of described signal comprises: frequency synthesizer, for utilizing frequency transmission system to generate local oscillation signal at the reference frequency signal of antenna end reproduction information centre, inputs to and compare facies unit; Microwave power divider, for the first auxiliary compensating signal from emitter that frequency transmission system is received in antenna end, by certain power ratio (according to actual needs), separate a road, input to than facies unit, this first auxiliary compensating signal is included in the phase noise that optical fiber link transmitting procedure is introduced; Compare facies unit, for utilizing the frequency inverted of the microwave signal that described local oscillation signal, the described first auxiliary compensating signal pass antenna down to the frequency identical with the described first auxiliary compensating signal, its phase place is deducted in advance to the phase noise that will introduce in above-mentioned optical fiber link transmission simultaneously, obtained precompensated signal; Optical modulator module, for being modulated to light signal by precompensated signal; And optical coupler, for described light signal being coupled to the circulator input of the reception compensation arrangement of antenna end, to transfer to information centre by above-mentioned optical fiber link.
Optionally, described system is also included in microwave power divider and than the microwave power amplifier between facies unit, for the microwave signal that microwave power divider is separated, carries out suitable power amplification; At the microwave power amplifier than between facies unit and optical modulator module, for carrying out suitable power amplification from the microwave signal of exporting than facies unit; Optical amplifier between optical modulator module and optical coupler, for carrying out suitable power amplification by the light signal of optical modulator module output.
According to a further aspect in the invention, also provide a kind of signal based on Frequency Synchronization steady phase retransmission method, the method comprises: the emitter of frequency transmission system is placed in to information centre, receive compensation arrangement and be placed in antenna end, by information centre's transmit frequency signal to antenna end, reference frequency signal in antenna end reproduction information centre, realizes the Frequency Synchronization of information centre and antenna end; Utilize described reproduction reference frequency signal, by frequency synthesizer, generate local oscillation signal, input to and compare facies unit; The reception compensation arrangement of antenna end receives the first auxiliary compensating signal from the emitter of information centre, be included in the phase noise corresponding with its frequency that optical fiber link when transmission introduce, by microwave power divider, this first auxiliary compensating signal separated to a road and input to and compare facies unit; Antenna end receives the microwave signal that comprises phase information from the external world, input to and compare facies unit; Than facies unit, utilize described local oscillation signal, with the described first auxiliary compensating signal, the frequency inverted of the microwave signal receiving is extremely assisted to the frequency that compensating signal is identical with described first, its phase place is deducted in advance to the phase noise that will introduce in above-mentioned optical fiber link transmission simultaneously, obtained precompensated signal; By optical modulator module, described precompensated signal is loaded on light signal, through optical coupler, is coupled to the circulator input that receives compensation arrangement, to transfer to information centre by above-mentioned optical fiber link.Because precompensated signal is identical with the first auxiliary compensating signal frequency from emitter that receives compensation arrangement reception, the phase noise (phase noise of deduction in advance) that the phase noise of introducing when it transmits in same optical fiber link also comprises with the described first auxiliary compensating signal is identical, in this signal receiving in information centre, two phase noises disappear mutually, and the phase information thus antenna end being received from the external world stably transfers to information centre.
Optionally, at described microwave power divider, separate after the step of described frequency signal, also comprise the step of described frequency signal being carried out to suitable power amplification; Described obtaining than facies unit, after the step of precompensated signal, also comprise the step of precompensated signal being carried out to suitable power amplification; After utilizing the step of described precompensated signal modulated light signal, also comprise the step that the light signal of optical modulator module output is carried out to suitable power amplification.
Utilize the solution of the present invention, by than facies unit, utilize local oscillation signal and receive the first auxiliary compensating signal that comprises optical fiber link phase noise that compensation arrangement receives, the frequency transitions of the microwave signal that antenna end is received from the external world is the frequency identical with the described first auxiliary compensating signal, its phase place is deducted in advance to the phase noise that transmission will be introduced in above-mentioned optical fiber link simultaneously, obtain precompensated signal, be loaded on again on light signal the emitter by above-mentioned Optical Fiber Transmission to signal center.Realize thus microwave signal surely the returning mutually to information centre being received from the external world by antenna end.
In addition, due to can be according to the frequency of antenna receiving signal, change the frequency of local oscillation signal, by produce the precompensated signal (this frequency and first of emitter from information centre assist the frequency of compensating signal identical) of determining frequency than facies unit, the steady phase return system of signal of the present invention can be realized the surely passback mutually of all frequency band signals, and described system has very high versatility.
Accompanying drawing explanation
Fig. 1 has shown for the frequency transmission system of Frequency Synchronization and signal return system applies in the schematic diagram of Deep Space Station system.
Fig. 2 has shown the existing (number of patent application: structural representation 201410141670.5) of the frequency transmission system for Frequency Synchronization;
Fig. 3 has shown the structural representation of the exemplary embodiments of the steady phase return system of signal of the present invention;
Fig. 4 has shown a kind of structural representation of the ratio facies unit in the exemplary embodiments of the steady phase return system of signal of the present invention;
Fig. 5 has shown the another kind of structural representation of the ratio facies unit in the exemplary embodiments of the steady phase return system of signal of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention more cheer and bright, below in conjunction with embodiment and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 2 has shown the structural representation of the existing frequency transmission system for Frequency Synchronization.
As shown in Figure 2, described existing frequency transmission system comprises: emitter, for generation of phase place, be locked in the frequency signal of reference frequency source, and by this frequency signal modulation on light signal to transmit to receiving compensation arrangement by optical fiber, with reception compensation arrangement, for receiving the light signal from emitter, demodulation obtains the frequency signal with optical fiber link phase noise, using this frequency signal as the first auxiliary compensating signal, and utilize frequency oscillator to generate microwave signal, be loaded on light signal and transfer to emitter through above-mentioned optical fiber link, through emitter, send back and receive compensation arrangement demodulation again, obtain the second auxiliary compensating signal that contains same phase noise with the first auxiliary compensating signal, based on the first auxiliary compensating signal and the second auxiliary compensating signal, generate phase compensation signal, utilize this phase compensation signal feedback to control the phase place of said frequencies oscillator output signal, reproduction phase place is locked in the frequency signal of frequency emission source.
Described reception compensation arrangement further comprises auxiliary compensation section and compensation section, and described auxiliary compensation section further comprises optical fiber circulator, optical modulator module, wavelength division multiplexer, the first detector and the second detector.
Suppose that the reference signal that reference frequency source produces is
V
0＝A
0cos(ω
0t+φ
ref)
Here, A
0amplitude for reference signal; φ
refphase place for reference signal; ω
0frequency for reference signal.
The frequency signal that emitter generation phase place is locked in reference signal is
V
1＝A
1cos(aω
0t+aφ
ref)
A wherein
1the amplitude that represents this frequency wave signal; A is Arbitrary Digit, and the frequency by the frequency of the frequency signal that will transmit divided by reference signal obtains.
Emitter passes through Optical Fiber Transmission by this frequency signal modulation to light signal, by the auxiliary compensation section that receives compensation arrangement, is received, and through circulator, inputs to wavelength division multiplexer.The phase noise of introducing in this process is assumed to φ
p, the factor such as this phase noise is subject to optical fiber link variation of ambient temperature of living in, the variation of the suffered mechanical stress of optical fiber impact.
The compensation section that receives compensation arrangement produces microwave signal
Wherein, A
3the amplitude that represents this microwave signal; φ
0the phase place that represents this microwave signal.This microwave signal, after the optical modulator module of auxiliary compensation section is modulated, is inputted above-mentioned optical fiber link through circulator and is transferred to emitter, then pass reception compensation arrangement back through emitter Yan Yuan road, through circulator, inputs to wavelength division multiplexer.Due to the frequency of this microwave signal frequency that is the frequency signal that transmitted by transmitting terminal half, along the phase noise of introducing in the process of same optical fiber link round-trip transmission, also should be φ
p.
The light signal of above-mentioned two-way incoming wave division multiplexer carries out demodulation through the first detector and the second detector respectively after by wavelength separated, obtains the first auxiliary compensating signal and the second auxiliary compensating signal, input offset portion.The form of this first auxiliary compensating signal and the second auxiliary compensating signal is:
V
2＝A
2cos(aω
0t+aφ
ref+φ
p)
Wherein, A
2it is the amplitude of the first auxiliary compensating signal; φ
pphase noise (seeing above) for optical fiber link introducing.A
4the amplitude that represents the second auxiliary compensating signal, the phase noise of being introduced by optical fiber link is also φ
p(seeing above).
It should be noted that the light signal for the ease of the above-mentioned two-way incoming wave of separation division multiplexer, the light signal that its corresponding optical modulator module is modulated need have different wavelength, and approaches as far as possible.
Compensation section utilizes the first auxiliary compensating signal and the second auxiliary compensating signal to generate phase compensation signal, utilizes this phase compensation signal feedback to control the microwave signal V that exports to auxiliary compensation section
3phase place, thereby obtain the reproduction reference frequency signal that phase place is locked in frequency emission source, the form of this signal is:
V
5＝A
5cos(ω
0t+φ
ref+C)
Wherein, A
5amplitude for reproduction reference frequency signal; ω
0frequency for reference signal; φ
refphase place for reference signal; C is a fixed constant.The reference frequency signal of reproduction has identical frequency with former reference signal, and phase difference C fixes, and the reference frequency signal phase place reappearing is locked in reference signal.Because C is on not impact of the variation of phase place, in order to express easily, can be omitted.The reference frequency signal of reproduction can be simplified shown as:
V
5＝A
5cos(ω
0t+φ
ref)
As mentioned above, obtained the reproduction reference frequency signal that phase place is locked in emitter end reference frequency source receiving compensation arrangement.Emitter and reference frequency source are placed in to information centre, reception compensation arrangement is placed in to antenna end, just can obtain the reproduction reference frequency signal V that phase place is locked in information centre's reference frequency source in antenna end
5, realize the Frequency Synchronization of information centre and antenna end.(detailed description of above content is referring in careful patent: 201410141670.5.)
Fig. 3 has shown the structural representation of the exemplary embodiments of the steady phase return system of the signal based on said frequencies transmission system that the present invention proposes.
As shown in Figure 3, emitter and the reference frequency source of said frequencies transmission system are placed in information centre, receive compensation arrangement and the steady phase return system of signal and 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 comprises: frequency synthesizer 101, and for the reproduction reference frequency signal V that utilizes frequency transmission system to generate in antenna end
5generate local oscillation signal V
6, input to than facies unit 103; Microwave power divider 102, for the first auxiliary compensating signal V that frequency transmission system is generated in antenna end
2by certain power ratio (according to actual needs), separate a road, input to than the auxiliary compensating signal V of facies unit 103, the first
2be included in the phase noise that optical fiber link transmission is introduced; Than facies unit 103, for utilizing described local oscillation signal V
6, the first auxiliary compensating signal V
2the microwave signal V that antenna end is received from the external world
recfrequency inverted to the first auxiliary compensating signal V
2identical frequency is deducted its phase place the phase noise that will introduce in above-mentioned optical fiber link transmission simultaneously in advance, obtains precompensated signal; Optical modulator module 104, for being modulated to light signal by precompensated signal; With optical coupler 105, for described modulated light signal being coupled to the optical fiber circulator input of the reception compensation arrangement of antenna end, to transfer to information centre by above-mentioned optical fiber link.
In Fig. 3, the microwave signal that the steady phase return system of signal receives from the external world is expressed as
V
rec＝A
reccos(ω
rect+φ
rec)
Wherein, A
recfor receiving the amplitude of signal; φ
recfor receiving the phase place of signal; ω
recfor receiving the frequency of signal.
It should be noted that the microwave signal being received from the external world by antenna end is generally high-frequency signal, the frequency of comparing the frequency signal being transmitted by optical fiber link is higher, so here with ω
recbe greater than a ω
0situation describe, but be not limited to this.
Receive the reproduction reference frequency signal V of the compensation section generation of compensation arrangement
5input to the steady phase return system of signal, the local oscillation signal generating through frequency synthesizer 101 is
V
6＝A
6cos(bω
0t+bφ
ref)
Wherein, A
6amplitude for local oscillation signal; B ω
0for the frequency of local oscillation signal, and immobilize, and by than the concrete structure of facies unit 103, receive signal V
recfrequency and the first auxiliary compensating signal V
2frequency uniquely determine (concrete grammar to its assignment sees below).
It should be noted that frequency synthesizer 101 can produce the optional frequency microwave signal that phase place is locked in reproduction reference frequency signal.
Microwave power divider 102 generates frequency transmission system the first auxiliary compensating signal V in antenna end
2by certain power ratio (according to actual needs), separate a road, input to than facies unit 103.
Optionally, according to actual needs, can utilize microwave power amplifier, the first auxiliary compensating signal V that microwave power divider 102 is separated
2carry out power amplification to a certain degree.
Ratio facies unit 103 in the steady phase return system of signal of the present invention, for utilizing the local oscillation signal V being generated by frequency synthesizer 101
6the microwave signal V that antenna is passed down
reccarry out frequency-conversion processing, part the first auxiliary signal V that recycling is exported by microwave power divider 102
2, the signal after frequency conversion is carried out to the pre-deduction of phase noise, obtain the intermediate frequency return path signal V of precompensation
8, its frequency and the first auxiliary compensating signal V
2frequency identical, the phase information that its phase place comprises the number of delivering a letter under antenna, and deduct in advance the phase noise that it will be introduced in optical fiber link transmission.
Fig. 4 is a kind of structural representation of the ratio facies unit 103 in the steady phase return system of signal of the present invention.
In Fig. 4
represent frequency mixer, it makes two input signals do multiplying, and filters high fdrequency component, makes the frequency of two signals and phase place do subtraction.
Scheme as shown in Figure 4, describedly comprises frequency mixer 201 and frequency mixer 202 than facies unit 103.Frequency mixer 201 is for utilizing local oscillation signal V
6, by the number of delivering a letter V under antenna
recbe converted to the first auxiliary compensating signal V
2the twice of frequency, obtains microwave signal V
7.Frequency mixer 202 is for utilizing the first auxiliary compensating signal V
2, by the microwave signal V after frequency conversion
7, deduct in advance the phase noise that will introduce in optical fiber link transmission.
Utilize the number of delivering a letter V under antenna
recwith local oscillation signal V
6through frequency mixer 201 mixing, collection of letters V achieves a butt joint
recfrequency-conversion processing, the microwave signal obtaining is:
V
7＝A
7cos[(ω
rec-bω
0)t+φ
rec-bφ
ref]
Wherein, A
7amplitude for this microwave signal.
Utilize microwave signal V
7with the first auxiliary compensating signal V
2through frequency mixer 202 mixing, realize the precompensation of phase noise, the precompensated signal obtaining is:
V
8＝A
8cos[(ω
rec-bω
0-aω
0)t+φ
rec-bφ
ref-aφ
ref-φ
p]
Wherein, A
8for the amplitude of this microwave signal, the phase place of pre-deduction is φ
p.
In order to make precompensated signal V
8the phase noise that transmission is introduced through optical fiber link is identical with the phase place of pre-deduction (is φ
p), and the first auxiliary compensating signal V
2the phase noise of introducing through same optical fiber link transmission comprising is also φ
p, precompensated signal V
8frequency should with the first auxiliary compensating signal V
2frequency identical,
ω
rec-bω
0-aω
0＝aω
0
Obtain
b＝ω
rec/ω
0-2a
Thereby obtain the local oscillation signal V that frequency synthesizer 101 generates
6frequency of b ω
0unique determined value.
Precompensated signal V
8can be expressed as
V
8＝A
8cos[aω
0t+φ
rec-bφ
ref-φ
p]
Thus, by having obtained precompensated signal V than facies unit 103
8, its frequency and the first auxiliary compensating signal V
2frequency identically (be a ω
0), its phase place comprises the number of delivering a letter V under antenna
6phase
rec, and deduct in advance the phase noise φ that will introduce in optical fiber link transmission
p.
Fig. 5 is the another kind of structural representation of the ratio facies unit 103 in the steady phase return system of signal of the present invention.
Due to scheme shown in Fig. 4, in the signal of 202 mixing of frequency mixer, microwave signal V
7frequency (2a ω
0) be the first auxiliary compensating signal V
2frequency (a ω
0) twice, the precompensated signal V exporting after mixing
8in will comprise this overtones band (a ω
0) harmonic components.In order to overcome the impact of this nonlinear effect, than facies unit, can adopt scheme as shown in Figure 5, comprise frequency synthesizer 301, frequency mixer 302, frequency mixer 303 and frequency mixer 304.
With reference to Fig. 5, frequency synthesizer 301 utilizes the reproduction reference frequency signal of the compensation section generation that receives compensation arrangement to generate low frequency local oscillation signal
V
9＝A
9cos(cω
0t+cφ
ref)
Wherein, A
9amplitude for low frequency local oscillation signal; C is arbitrary constant, and c<a, c ≠ a/2.(detailed description sees below.)
It should be noted that frequency synthesizer 301 can produce the optional frequency microwave signal that phase place is locked in reproduction reference frequency signal.
By low frequency local oscillation signal V
9with the first auxiliary compensating signal V
2through frequency mixer 302 mixing, obtain the tenth microwave signal
Wherein, A
10it is the amplitude of the tenth microwave signal.
It should be noted that the low frequency local oscillation signal V when frequency synthesizer 301 outputs
9frequency be c ω
0=a ω
0/ 2 o'clock (being c=a/2), the output signal V of frequency mixer 302
10frequency be (a-c) ω
0=a ω
0/ 2, the frequency of the two is consistent, the output signal V after mixing and filtering
10in will comprise and it is with input signal V frequently
9composition, therefore require low frequency local oscillation signal V
9frequency c
0≠ a ω
0/ 2, i.e. c ≠ a/2.
Utilize local oscillation signal V
6with the signal V receiving from the external world
recthrough frequency mixer 303 mixing, realize the down-conversion of the number of delivering a letter under antenna, obtain the 11 microwave signal
V
11＝A
11cos[(ω
rec-bω
0)t+φ
rec-bφ
ref]
Wherein, A
11it is the amplitude of the 11 microwave signal.
Utilize the tenth microwave signal V
10with the 11 microwave signal V
11through frequency mixer 304 mixing, realize the pre-deduction of phase noise, obtain precompensated signal
V
12＝A
12cos[(ω
rec-aω
0-bω
0+c
0)t+φ
rec-(a+b-c)φ
ref-φ
p]
Wherein, A
12amplitude for precompensated signal.
In order to make precompensated signal V
12the phase noise that transmission will be introduced through optical fiber link is identical with the phase place of pre-deduction (is φ
p), and the first auxiliary compensating signal V
2the phase noise of introducing through same optical fiber link transmission comprising is also φ
p, this precompensated signal V
12frequency should with the first auxiliary compensating signal V
2frequency identical,
ω
rec-aω
0-bω
0+cω
0＝aω
0
Obtain
b＝ω
rec/ω
0-2a+c
Thereby obtain the local oscillation signal V that frequency synthesizer 101 generates
6frequency of b ω
0unique determined value.
Thereby precompensated signal V
12can be expressed as
Thus, the precompensated signal V obtaining
12the precompensated signal V obtaining with scheme described in Fig. 4
8have identical frequency and phase place, its frequency is all assisted compensating signal V with first
2frequency identically (be a ω
0), its phase place all comprises the number of delivering a letter V under antenna
6phase
rec, and deduct in advance the phase noise φ that will introduce in optical fiber link transmission
p.
The method of work that it should be noted that the ratio facies unit shown in Fig. 4 and Fig. 5 is only exemplary, is not construed as limiting the invention.
In addition, in practical application, can be according to the number of delivering a letter V under antenna
recfrequency, the first auxiliary compensating signal V
2frequency determine in the present invention than the concrete structure of facies unit 103, thereby the local oscillation signal V that unique definite medium frequency synthesizer 101 of the present invention generates
6frequency and phase place, utilize local oscillation signal to carry out frequency-conversion processing to the number of delivering a letter under antenna, to obtain the precompensated signal of determining frequency.
Optical modulator module 104 is loaded on described precompensated signal on light signal, is coupled to the optical fiber circulator input of the frequency signal reception compensation arrangement of antenna end, to transfer to information centre by same optical fiber link through optical coupler 105.
Optionally, between than facies unit 103 and optical modulator module 104, can add microwave power amplifier, for carrying out suitable power amplification from the microwave signal of exporting than facies unit 103.
Optionally, between optical modulator module 104 and optical coupler 105, can add optical amplifier, for the light signal of optical modulator module 104 outputs is carried out to suitable luminous power, amplify.
Optical coupler 105 of the present invention is for leading up to same Optical Fiber Transmission by two ways of optical signals is synthetic.Optionally, can adopt the methods such as wavelength division multiplexer to realize this function, not at the row of discussion of the present invention.
It should be noted that 104 outputs of this optical modulator module through precompensated signal V
8(V
12) light signal of modulation, receive with frequency signal the 3rd microwave signal V generating in compensation arrangement
3the light signal of modulation, by same circulator through same fibre link transmission to information centre, therefore described two ways of optical signals should have different wavelength, so that two ways of optical signals is separated in information centre.
In information centre, by emitter, receive described two ways of optical signals, can utilize wavelength division multiplexer to carry out separation according to the difference of its optical wavelength, to having loaded precompensated signal V
8(V
12) light signal carry out demodulation, due to precompensated signal V
8(V
12) and the first auxiliary compensating signal V
2frequency identical, the phase noise of introducing when it transmits in same optical fiber link also should identically (be φ
p, the phase noise of also deducting in advance), two phase place noise disappears mutually, thus the signal obtaining in information centre's demodulation is
V
13＝A
13cos[aω
0t+φ
rec-bφ
ref]
Wherein, A
13amplitude for this signal.
From above formula, the complete phase information φ of antenna end from the signal of external world's reception that retained in the signal that information centre receives
rec, and eliminated the phase noise that fiber transmission link is introduced.Transfer to information centre the information stability thus antenna end being received from the external world.
In sum, the steady phase return system of signal of the present invention, utilize existing frequency transmission system at the reference frequency signal of the reception compensation arrangement reproduction of antenna end, and the first auxiliary compensating signal generating, the microwave signal that antenna is passed is down carried out frequency-conversion processing, its phase place is deducted in advance to the phase noise that will introduce in optical fiber link transmission simultaneously, to obtain precompensated signal, be modulated to again on light signal, the optical fiber link used by frequency transmission system transfers to information centre, through demodulation, can obtain the phase information of the microwave signal of antenna end reception, and eliminated the phase noise that fiber transmission link is introduced, realize thus signal surely the returning mutually to information centre being received by antenna end.
The present invention also provides a kind of signal based on Frequency Synchronization steady phase retransmission method, and the method is implemented by the steady phase return system of signal of introducing above.
The steady phase retransmission method of signal based on Frequency Synchronization of the present invention comprises step: the emitter of frequency transmission system is placed in to information centre, receive compensation arrangement and be placed in antenna end, by information centre's transmit frequency signal to antenna end, reference frequency signal in antenna end reproduction information centre, realizes the Frequency Synchronization of information centre and antenna end; By frequency synthesizer 101, utilize the reference frequency signal of described reproduction to generate local oscillation signal, input to than facies unit 103; Reception compensation arrangement in antenna end receives the first auxiliary compensating signal from the emitter of information centre, and the phase noise of introducing while being included in optical fiber link transmission, separates a road by microwave power divider 102 by this signal and input to than facies unit 103; Antenna end receives the microwave signal that comprises phase information from the external world, input to than facies unit 103; Than facies unit 103, utilize the frequency inverted of the microwave signal that described local oscillation signal and the described first auxiliary compensating signal pass antenna down to the frequency identical with the first auxiliary compensating signal, its phase place is deducted in advance to the phase noise that will introduce in above-mentioned optical fiber link transmission simultaneously, obtained precompensated signal; By optical modulator module 104, described precompensated signal is loaded on light signal; Optical coupler is coupled to described modulated light signal the circulator input of the reception compensation arrangement of antenna end, to transfer to information centre by above-mentioned optical fiber link; In information centre, receive and loaded the light signal of precompensated signal and other light signal being transmitted by reception compensation arrangement, utilize wavelength division multiplexer according to the difference of its optical wavelength, to isolate the light signal that has loaded precompensated signal, and carry out demodulation, owing to deducting in advance the phase noise of being introduced by optical fiber link transmission before transmission, in the phase place of the restituted signal obtaining after transmission, do not comprise described noise, thereby realize antenna end, receive the phase information of signal to the surely passback mutually of information centre.Each device architecture and operation principle that the method is related are described in detail in the explanation in conjunction with Fig. 1-5 in the above, do not repeat them here.
Optionally, at described microwave power divider, separate after the step of the described first auxiliary compensating signal, also comprise the step that the described first auxiliary compensating signal is carried out to suitable power amplification; Described obtaining than facies unit, after the step of precompensated signal, also comprise the step of precompensated signal being carried out to suitable power amplification; After utilizing the step of described precompensated signal modulated light signal, also comprise the step that the light signal of optical modulator module output is carried out to suitable power amplification.
In sum, the present invention is intended to protect the steady phase return system of a kind of signal based on Frequency Synchronization and method, technical scheme of the present invention has significant technique effect, the steady phase return system of signal proposing by the present invention, utilize existing frequency transmission system, the microwave signal that antenna end is received from the external world is carried out the precompensation of phase noise, recycle the described frequency transmission system signal transmission medium of Networks of Fiber Communications used, precompensated signal is transferred to information centre, eliminated the interference of transmitting procedure introducing phase noise, the signal that realization is received from the external world by antenna end is to the surely passback mutually of information centre, and can long-time continuous operation.
Should be understood that, above-mentioned embodiment of the present invention is only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore any modification of, making, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in without departing from the spirit and scope of the present invention in the situation that.In addition, claims of the present invention are intended to contain whole variations and the modification in the equivalents that falls into claims scope and border or this scope and border.
Claims (4)
1. the steady phase return system of the signal based on Frequency Synchronization, described Frequency Synchronization is realized by frequency transmission system, this frequency transmission system comprises that frequency signal emitter and frequency signal receive compensation arrangement, wherein said emitter is positioned at information centre, described reception compensation arrangement is positioned at antenna end, described emitter is transmitted to described reception compensation arrangement by frequency signal, and to realize the Frequency Synchronization of described information centre and described antenna end, the steady phase return system of described signal comprises:
Frequency synthesizer (101), for utilizing frequency transmission system to generate local oscillation signal at the reference frequency signal of antenna end reproduction information centre, inputs to than facies unit (103);
Microwave power divider (102), for frequency transmission system is separated to a road at the first auxiliary compensating signal of the emitter from information centre of antenna end reception, input to than facies unit (103), this first auxiliary compensating signal is included in the phase noise corresponding with its frequency that optical fiber link transmission is introduced;
Than facies unit (103), for utilizing the frequency inverted of described local oscillation signal, the described first auxiliary compensating signal receive antenna end microwave signal from the external world to the frequency identical with the described first auxiliary compensating signal, its phase place is deducted in advance to the phase noise that will introduce in above-mentioned optical fiber link transmission simultaneously, obtained precompensated signal;
Optical modulator module (104), for being modulated to light signal by precompensated signal; And
Optical coupler (105), for described modulated light signal being coupled to the circulator input of the reception compensation arrangement of described frequency transmission system, with by above-mentioned Optical Fiber Transmission to information centre.
2. the steady phase return system of signal according to claim 1, is characterized in that, this system also comprises:
Be connected to microwave power divider (102) and than the microwave power amplifier between facies unit (103), for the described first auxiliary compensating signal that microwave power divider (102) is separated, carry out power amplification;
Be connected to than the microwave power amplifier between facies unit (103) and optical modulator module (104), for carrying out power amplification than the microwave signal of facies unit (103) output;
Be connected to the optical amplifier between optical modulator module (104) and optical coupler (105), for the light signal of optical modulator module (104) output is carried out to power amplification.
3. the steady phase retransmission method of the signal based on Frequency Synchronization, is characterized in that, described method comprises:
3.1 are placed in information centre by the emitter of frequency transmission system, receive compensation arrangement and be placed in antenna end, by information centre's transmit frequency signal, to antenna end, in antenna end, reappear the reference frequency signal of information centre, realize the Frequency Synchronization of information centre and antenna end;
3.2 utilize the reference frequency signal of described reproduction to generate local oscillation signal in antenna end by frequency synthesizer (101);
The 3.3 reception compensation arrangements in antenna end receive the first auxiliary compensating signal from the emitter of information centre, the phase noise corresponding with its frequency of introducing when it is included in optical fiber link transmission, separates a road by microwave power divider (102) by this first auxiliary compensating signal and inputs to than facies unit (103);
3.4 antenna end receive the microwave signal that comprises phase information from the external world, input to than facies unit (103);
3.5 utilize described local oscillation signal, with the described first auxiliary compensating signal, the frequency inverted of this microwave signal is extremely assisted to the frequency that compensating signal is identical with described first than facies unit (103), its phase place is deducted in advance to the phase noise that will introduce in above-mentioned optical fiber link transmission simultaneously, obtained precompensated signal;
3.6 are loaded on described precompensated signal on light signal by optical modulator module (104);
3.7 optical couplers (105) are coupled to frequency transmission system at the circulator input of the reception compensation arrangement of antenna end by described modulated light signal, to transfer to information centre by above-mentioned optical fiber link;
3.8 information centre receives other light signal being transmitted by reception compensation arrangement in described light signal and described frequency transmission system, utilize wavelength division multiplexer to differentiate each road light signal according to the difference of its optical wavelength, the light signal that steady phase return system is transmitted carries out demodulation, owing to deducting in advance the phase noise of being introduced by optical fiber link transmission before transmission, in the phase place of the restituted signal obtaining, do not comprise described noise, thereby realize antenna end, receive the phase information of signal to the surely passback mutually of information centre.
4. the steady phase retransmission method of signal according to claim 3, is characterized in that, described method also comprises:
At described microwave power divider (102), separate after the step of the described first auxiliary compensating signal the step that the described first auxiliary compensating signal is carried out to suitable power amplification;
Described, than facies unit (103), obtain, after the step of precompensated signal, precompensated signal being carried out to the step of suitable power amplification;
After utilizing the step of described precompensated signal modulated light signal, the step that the light signal of optical modulator module (104) output is carried out to suitable power amplification.
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