CN109039471A - A kind of numerical model analysis demodulation method applied to high-rate laser communication - Google Patents
A kind of numerical model analysis demodulation method applied to high-rate laser communication Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6164—Estimation or correction of the frequency offset between the received optical signal and the optical local oscillator
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/63—Homodyne, i.e. coherent receivers where the local oscillator is locked in frequency and phase to the carrier signal
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Abstract
The invention discloses a kind of numerical model analysis demodulation methods applied to high-rate laser communication, comprising: carries out coarse compensation to the carrier wave optical signal of acquisition；Photoelectric conversion is carried out to compensated carrier wave optical signal is obtained, generates electric signal；By the mixing orthogonal with local oscillation signal progress of the electric signal of generation, base band quadrature signal is obtained；Base band quadrature signal is divided into two paths of signals；First via signal is supplied to FPGA by limiter, FPGA carries out demodulation to first via signal and obtains base band data；Second road signal is passed through into simulation process, obtains the phase discrimination signal of residual carrier；The phase discrimination signal of residual carrier is supplied to FPGA after A/D is converted；And FPGA captures the phase discrimination signal of the residual carrier after A/D is converted, carrier wave reconstruct is carried out after tracking processing, and the carrier wave based on reconstruct and analog phase-locked look PPL carry out orthogonal modulation and obtain local oscillation signal.
Description
Technical field
The present invention relates to satellite communication technology field, in particular to a kind of numerical model analysis solution applied to high-rate laser communication
Tune method.
Background technique
Laser space communication system requires to carry out high-speed communication as medium using laser between space-based terminal, needs to cope with
The scene of large dynamic high speed signal processing, it is desirable that reduction complexity and power consumption as much as possible, to adapt to power constrained system.
Currently, space high-rate laser communication control processor has relevant and incoherent two kinds of standards: incoherent mainly with intensity tune
System is directly detected as representing, and receiving sensitivity is low, and the availability of frequency spectrum is low；And coherent communication is due to the amplification of local oscillator light
And the advantage with sensitivity, and can choose high-order modulating to improve the availability of frequency spectrum.
Coherent demodulation technology is mainly divided into two classes again: simulation homodyne Optical phase-locked loop technology and digital light heterodyne technology.Simulation
Homodyne Optical phase-locked loop technical solution is similar to traditional microwave receiver scheme, only more by traditional voltage controlled oscillator (VCO)
It is changed to tunable optical local oscillator, and the Frequency Estimation of carrier wave ring, frequency and phase discrimination, loop filtering and the adjusting of local oscillator light are all by simulating
Device control is completed, this scheme has relatively high requirement to the stability of laser and drift rate and is easy to be influenced by environment；
Digital light heterodyne technology scheme then obtains intermediate-freuqncy signal by photomixing first, is then adopted by high-speed AD converter (ADC)
Sequence of operations, this scheme such as capture, tracking, clock recovery and data demodulation are completed in sample to digit chip needs high speed analog-digital conversion
Converter (ADC) and high-speed parallel handle chip, and algorithm complexity is high, power consumption is high.
In addition, the carrier Doppler frequency of laser communication is up to 10GHz or so, corresponding systematic symbols speed between low orbit satellite
Rate needs to reach tens of Gbps magnitudes, and the sampling rate of analog-digital converter (ADC) needs to meet " Nyquist's theorem " (i.e.
The sample frequency of ADC is at least 2 times of signal frequency) transmitted symbol can just be sampled, therefore traditional digital processing side
Method has been not suitable for, and conventional carrier synchronous method is also difficult to apply.
Therefore, it is badly in need of the novel numerical model analysis demodulating equipment for being applied to high-rate laser communication of one kind and method to solve
The efficient demodulation for being difficult to realize large dynamic high speed laser signal present in the laser communication prior art is stated, high speed analog-digital conversion is needed to turn
The problems such as parallel operation (ADC) and high-speed parallel handle chip, and algorithm complexity is high, power consumption is high.
Summary of the invention
For the efficient demodulation for being difficult to realize large dynamic high speed laser signal in the presence of the laser communication prior art, need
High-speed AD converter (ADC) and high-speed parallel is wanted to handle chip, the problems such as algorithm complexity is high, power consumption is high, according to this hair
Bright one embodiment provides a kind of numerical model analysis demodulation method applied to high-rate laser communication, comprising:
Coarse compensation is carried out to the carrier wave optical signal of acquisition；
Photoelectric conversion is carried out to compensated carrier wave optical signal is obtained, generates electric signal；
By the mixing orthogonal with local oscillation signal progress of the electric signal of generation, base band quadrature signal is obtained；
Base band quadrature signal is divided into two paths of signals；
First via signal is supplied to FPGA by limiter,
FPGA carries out demodulation to first via signal and obtains base band data；
Second road signal is passed through into simulation process, obtains the phase discrimination signal of residual carrier；
The phase discrimination signal of residual carrier is supplied to FPGA after A/D is converted；And
FPGA captures the phase discrimination signal of the residual carrier after A/D is converted, carries out carrier wave weight after tracking processing
Structure, and the carrier wave based on reconstruct and analog phase-locked look PPL carry out orthogonal modulation and obtain local oscillation signal.
In an embodiment of the present invention, the method for the carrier wave optical signal progress coarse compensation of described pair of acquisition further comprises；
Satellite-orbit information obtains carrier doppler signal；
Processing is amplified by carrier doppler signal of the image intensifer to acquisition；And
By adjust local oscillator laser generate trimmed book vibration, in optical mixer unit to amplified carrier doppler signal into
Row coarse compensation.
In an embodiment of the present invention, it obtains compensated carrier wave optical signal progress photoelectric conversion for described pair, generates telecommunications
Number method be that the optical signal exported by balanced detector, bandpass filter and low-noise amplifier to optical mixer unit carries out
Photoelectric conversion generates electric signal.
In an embodiment of the present invention, it is described by base band quadrature signal be divided into two paths of signals be using power splitter by base band just
Signal is handed over to be divided into two-way.
In an embodiment of the present invention, the FPGA carries out the specific method that demodulation obtains base band data to first via signal
To obtain base band data by decision feedback equalizer (DFE), the demodulation of clock and data recovery (CDR) module.
In an embodiment of the present invention, the FPGA catches the phase discrimination signal of the residual carrier after A/D is converted
The method obtained further comprises:
Frequency control word is set by software and controls D/A outgoing carrier frequency；
The detection of error signals in two local frequencies；
If all not detecting error signal in two local frequencies, local frequency is adjusted, continuation is entirely being handled
Scanning in bandwidth；And
If continuously all detecting error signal in two local frequencies, judge to obtain error signal frequency.
In an embodiment of the present invention, the frequency control word isWherein M is phase controlling word length.
In an embodiment of the present invention, the method for the detection of error signals in two local frequencies is to error correction
Signal carries out N point FFT transform, and search is more than the peak point m of threshold value, if the Amplitude Ratio of peak point and minor peaks point is greater than 10,
Error signal is then confirmly detected, frequency is represented byWherein N, M respectively indicate FFT length and phase controlling
Word length, fsFor A/D sample frequency.
In an embodiment of the present invention, the method that the judgement obtains error signal frequency is as follows:
If local frequency is respectively fref,1And fref,2(fref,2>fref,1), corresponding peak value is P1And P2, error signal estimates
Meter frequency is f1And f2；
If P1>P2, then error signal frequency f=fref,1+f1；
If P1<P2, then error signal frequency f=fref,2- f2。
The present invention provides a kind of numerical model analysis demodulation method applied to high-rate laser communication, believes first with satellite orbit
Breath obtains carrier doppler information, carries out coarse compensation to carrier doppler by adjusting trimmed book vibration, and to optical mixer unit output
Laser signal carries out photoelectric conversion, generates electric signal；Then mixing orthogonal with locally generated local oscillation signal progress, obtains base band
Orthogonal signalling；Base band quadrature signal is divided into two-way, is sent into the GTX module of FPGA and is handled by limiter all the way, is led to
It crosses decision feedback equalizer (DFE), the modules such as clock and data recovery (CDR) demodulate base band data, and another way is by simulation
Reason obtains the phase discrimination signal of residual carrier, is collected in FPGA by A/D, generates the residual carrier of reconstruct, and adjusts local sheet
Vibration frequency achievees the purpose that carrier synchronization.High-speed a/d conversion is not needed based on numerical model analysis demodulation method of the invention, so that it may
To realize the efficient demodulation of large dynamic high speed laser signal.
Detailed description of the invention
For the above and other advantages and features for each embodiment that the present invention is furture elucidated, will be presented with reference to attached drawing
The more specific description of various embodiments of the present invention.It is appreciated that these attached drawings only describe exemplary embodiments of the invention, therefore
It is not to be regarded as being restriction on its scope.In the accompanying drawings, in order to cheer and bright, identical or corresponding component will use identical or class
As mark indicate.
Fig. 1 shows a kind of numerical model analysis solution applied to high-rate laser communication provided according to one embodiment of present invention
The receiver structure schematic diagram of tune method.
Fig. 2 shows a kind of numerical model analysis solutions applied to high-rate laser communication provided according to a particular embodiment of the invention
The flow chart of tune method.
Fig. 3 shows a kind of numerical model analysis solution applied to high-rate laser communication provided according to a particular embodiment of the invention
The capturing carrier flow chart of tune method.
Specific embodiment
In the following description, with reference to each embodiment, present invention is described.However, those skilled in the art will recognize
Know can in the case where none or multiple specific details or with other replacements and/or addition method, material or component
Implement each embodiment together.In other situations, well known structure, material or operation are not shown or are not described in detail in order to avoid making this
The aspects of each embodiment of invention is obscure.Similarly, for purposes of explanation, specific quantity, material and configuration are elaborated, with
Comprehensive understanding to the embodiment of the present invention is just provided.However, the present invention can be implemented in the case where no specific detail.This
Outside, it should be understood that each embodiment shown in the accompanying drawings is illustrative expression and is not drawn necessarily to scale.
In the present specification, the reference of " one embodiment " or " embodiment " is meaned to combine embodiment description
A particular feature, structure, or characteristic is included at least one embodiment of the invention.Occur in everywhere in this specification short
Language " in one embodiment " is not necessarily all referring to the same embodiment.
It should be noted that the embodiment of the present invention is described method and step with particular order, however this is only
Facilitate and distinguish each step, and is not the sequencing for limiting each step, it in different embodiments of the invention, can be according to side
Method is adjusted to adjust the sequencing of each step.
The present invention provides a kind of numerical model analysis demodulation method applied to high-rate laser communication, believes first with satellite orbit
Breath obtains carrier doppler information, carries out coarse compensation to carrier doppler by adjusting trimmed book vibration, and to optical mixer unit output
Laser signal carries out photoelectric conversion, generates electric signal；Then mixing orthogonal with locally generated local oscillation signal progress, obtains base band
Orthogonal signalling；Base band quadrature signal is divided into two-way, is sent into the GTX module of FPGA and is handled by limiter all the way, is led to
It crosses decision feedback equalizer (DFE), the modules such as clock and data recovery (CDR) demodulate base band data, and another way is by simulation
Reason obtains the phase discrimination signal of residual carrier, is collected in FPGA by A/D, generates the residual carrier of reconstruct, and adjusts local sheet
Vibration frequency achievees the purpose that carrier synchronization.High-speed a/d conversion is not needed based on numerical model analysis demodulation method of the invention, so that it may
To realize the efficient demodulation of large dynamic high speed laser signal.
With reference to the accompanying drawing 1-2 come introduce based on one embodiment of the present of invention be applied to high-rate laser communication digital-to-analogue
Mix demodulation method.Fig. 1 shows a kind of digital-to-analogue applied to high-rate laser communication provided according to one embodiment of present invention
Mix the receiver structure schematic diagram of demodulation method；Fig. 2 shows the one kind provided according to a particular embodiment of the invention to be applied to
The flow chart of the numerical model analysis demodulation method of high-rate laser communication；Fig. 3 shows one provided according to a particular embodiment of the invention
Kind is applied to the capturing carrier flow chart of the numerical model analysis demodulation method of high-rate laser communication.
Firstly, carrying out coarse compensation to laser signal in step 201.As shown in Figure 1, satellite-orbit information acquisition carrier wave is more
After general Le signal breath, after carrier doppler signal of the image intensifer to acquisition amplifies processing, then by adjusting local oscillator
Laser generates trimmed book vibration, carries out coarse compensation to amplified carrier doppler signal in optical mixer unit, obtains compensated
Carrier doppler signal.
Next, carrying out photoelectric conversion in step 202 to compensated carrier doppler signal is obtained, generating electric signal.
In one embodiment of the invention, as shown in Figure 1, passing through balanced detector, bandpass filter and low-noise amplifier pair
The laser signal of optical mixer unit output carries out photoelectric conversion, generates electric signal.
Then, in step 203, the electric signal of generation and locally generated local oscillation signal are carried out just by orthogonal mixer
Mixing is handed over, base band quadrature signal is obtained.In one embodiment of the invention, as shown in Figure 1, local oscillation signal is by digital directly frequency
Rate synthesizes DDS and analog phase-locked look PPL and carries out orthogonal mixed modulated then in progress frequency multiplication mode generation, has frequency dynamic model
Enclose the advantage big, phase noise is low, adjustment speed is fast.
Next, base band quadrature signal is divided into two-way in step 204.In one embodiment of the invention, function is utilized
Divide device that base band quadrature signal is divided into two-way.The high speed serialization receiving module being output in FPGA all the way, is output to carrier wave all the way
In capture and tracking module.
Then, in step 205, by wherein signal is supplied to the high speed serialization in FPGA by limiter and receives mould all the way
Block.
Next, demodulation obtains base band data in step 206.Since present invention data rate to be treated is up to tens
Gbps, conventional A/D chip and FPGA can not handle the signal of so high-speed at all.In one embodiment of the present of invention
In, as shown in Figure 1, devising the processing scheme based on high speed serialization reception pattern, base band quadrature signal is entered by limiter
In high speed serialization receiving module in FPGA, pass through the modules solutions such as decision feedback equalizer (DFE), clock and data recovery (CDR)
It adjusts and obtains base band data, be further processed in FPGA, so that A/D sampling be omitted, while being received by high speed serialization
Module carries out parallel processing to data, reduces the requirement to FPGA processing clock.
Then, in step 207, it wherein will pass through simulation process by another way signal, and obtain the phase discrimination signal of residual carrier.?
In one embodiment of the present of invention, as shown in Figure 1, simulation process is handled by analog multiplier and low-pass filter.
Next, the carrier wave that the phase discrimination signal of residual carrier is supplied to FPGA after A/D is converted is caught in step 208
It obtains and tracking module.
Finally, the capturing carrier and tracking module of FPGA captures phase discrimination signal, after tracking processing in step 209
Carrier wave reconstruct is carried out, and the carrier wave based on reconstruct adjusts local oscillation signal and achievees the purpose that carrier synchronization.
A specific embodiment according to the present invention is providing the above-mentioned numerical model analysis solution for being applied to high-rate laser communication
When tune method, the main technical content being related to includes:
1) intermediate frequency quadrature frequency mixing technique
Refer to that the local oscillation signal for generating broadband signal with local oscillator laser after amplifier amplifies is input to optical mixer unit
It is middle to carry out orthogonal mixing, down coversion is carried out to input signal and eliminates carrier Doppler shift, is exported as two-way base band quadrature letter
Number.Local oscillation signal synthesizes DDS and analog phase-locked look PPL by direct digital frequency and carries out the generation of orthogonal modulation mode, has frequency
The advantage that dynamic range is big, phase noise is low, adjustment speed is fast.
2) power splitter
Refer to and base band quadrature signal is divided into two-way using power splitter.Orthogonal mixer exports base band quadrature signal, passes through
It is divided into two-way after power splitter, the high speed serialization receiving module being output in FPGA all the way is output to capturing carrier and tracking all the way
In module.
3) analogue phase detection and low-pass filtering
Refer to and low-pass filtering is carried out to phase demodulation error after carrying out analogue phase detection to base band quadrature signal, base band quadrature signal can
It respectively indicates are as follows:
I=cos (Δ ω t) (1)
Q=sin (Δ ω t) (2)
Wherein Δ ω is frequency residual error, and t is the time, then phase demodulation error may be expressed as:
Δ θ (t)=sin (2 Δ ω t) (3)
After analogue phase detection, low-pass filtering is carried out to phase demodulation error, to assist subsequent capturing carrier and tracking.
4) A/D is sampled
Refer to and the phase demodulation error of phase discrimination signal is sampled by A/D.Phase demodulation error may be expressed as: after A/D is sampled
Wherein, fsFor A/D sample frequency, n is sampled point serial number, and Ω is normalization numerical frequency, and ε is direct current biasing.
5) biasing is eliminated
Refer to DC-offset correction.Since carrier estimation and tracking are very sensitive to direct current biasing, need before treatment
It will DC-offset correction first.It needs to carry out blocking processing by high-pass filter, the digital phase detection of phase discrimination signal misses after processing
Difference may be expressed as:
Δ θ (n)=sin (Ω n) (5)
6) capturing carrier
Refer to the capturing carrier for carrying out phase discrimination signal.In one particular embodiment of the present invention, it is contemplated that remaining how general
It strangles frequency range and is up to several hundred MHz, the working frequency of A/D, D/A are too high if directly sampling and regenerating, and also have to FPGA processing
Huge pressure.Therefore the present invention proposes a kind of scanning strategy, is incited somebody to action by way of software control local frequency in analog portion
Entire frequency acquisition range is divided into multiple frequency bands, scans in each section to Doppler frequency, so that A/D chip is only
It needs to sample single frequency section, greatly reduces the pressure and FPGA processing speed of A/D sampling.
Due to generating real signal by complex signal in phase demodulation, it is lost frequency symbol information, therefore become using conventional FFT
It can only obtain the absolute deviation of frequency when swap-in row capturing carrier, and can not judge positive frequency or negative frequency.For this purpose, Fig. 3
A kind of load of the numerical model analysis demodulation method applied to high-rate laser communication provided according to a particular embodiment of the invention is shown
Wave captures flow chart, as shown in figure 3, as follows to the frequency estimation algorithm amendment based on FFT:
A frequency control word control D/A outgoing carrier frequency) is arranged by software to set in entire frequency range by stepping
Frequency control word control D/A outgoing carrier frequency is set, step value is a half-band width of low-pass filter B, be may be expressed as:
Δ θ (n)=sin (Ω n) (5)
fref=fc-fd,max,fc-fd,max+Δf,...,fc+fd,max-Δf,fc+fd,max (6)
Δ f=B/2 (7)
Wherein, frefIt is the local frequency of orthogonal mixer, fcIt is setting carrier frequency, fd,maxIt is the Doppler frequency upper limit,
Δ f is frequency step value, and B indicates the bandwidth of low-pass filter B.
B) to error correction signal carry out N point FFT transform, search be more than predetermined threshold peak point m, if peak point with
The Amplitude Ratio of minor peaks point is greater than 10, it is determined that detects that error signal, frequency may be expressed as:
Wherein fsFor A/D sample frequency.
C) if all not detecting error signal in two local frequencies, local frequency is adjusted, continuation is entirely being located
Manage scanning in bandwidth；
D) if continuously error signal is all detected in two local frequencies, if local frequency is respectively fref,1And fref,2
(fref,2>fref,1), corresponding peak value is P1And P2, error signal estimation frequency is f1And f2, then error signal frequency can determine whether as
Under:
If P1>P2, then error signal frequency:
F=fref,1+f1 (9)
Conversely, if P1<P2, then error signal frequency
F=fref,2- f2 (10)
E) corresponding frequency control word isWherein M is phase controlling word length.
7) carrier track
Refer to the carrier track for carrying out phase discrimination signal.In one embodiment of the invention, after capturing carrier success, then stop
Only capture scanning starts carrier track.Since D/A work clock should be 3 times or more of signal frequency, generation frequency reaches several hundred
Requirement of the carrier wave of MHz to D/A is very high.In order to reduce the work clock of D/A, in one embodiment of the invention, using mould/
The mode that number combines, in the digital domain by the frequency compression of regenerated carrier signal to original 1/8th, then in simulation process
Reappear actual frequency by way of frequency multiplication, to reduce the requirement to D/A working frequency.
In one particular embodiment of the present invention, in order to reduce D/A working frequency, frequency is carried out in the track special
Processing, method are as follows:
A) frequency control word that capturing unit determines is set by the frequency control word of carrier regeneration module E；
B) error correction signal input loop filtering unit C is filtered；
C) loop filtering is exported divided by 8, is input to carrier regeneration module E as frequency control word.
8) orthogonal modulation
Refer to after completing carrier wave reconstruct, carrier signal and analog phase-locked look PPL based on reconstruct carry out orthogonal modulation mode
Local oscillation signal is generated, has the advantages that frequency dynamic range is big, phase noise is low, adjustment speed is fast.Due to being incited somebody to action in carrier track
Frequency control word reduces 8 times, therefore needs to carry out 4 frequencys multiplication to signal after orthogonal modulation, generates true control frequency.
9) high speed serialization receives
Refer to FPGA to progress data high-speed serial received.Since present invention data rate to be treated is up to tens
Gbps, conventional A/D chip and FPGA can not handle the signal of so high-speed at all.In one embodiment of the present of invention
In, the processing scheme based on high speed serialization reception pattern is devised, base band quadrature signal carries out the height in FPGA by limiter
In fast serial received module, after the processing such as decision feedback equalization, time synchronization, base band data is obtained, is carried out in FPGA
It is further processed, so that A/D sampling be omitted, while parallel processing is carried out to data by high speed serialization receiving module, reduced
Requirement to FPGA processing clock.
It is applied to the numerical model analysis demodulation method of high-rate laser communication based on this kind provided by the invention, first with satellite
Orbit information obtains carrier doppler information, carries out coarse compensation to carrier doppler by adjusting trimmed book vibration, and to optical mixer unit
The laser signal of output carries out photoelectric conversion, generates electric signal；Then mixing orthogonal with locally generated local oscillation signal progress, obtains
To base band quadrature signal；Base band quadrature signal is divided into two-way, is sent into all the way by limiter in the GTX module of FPGA
Reason, by decision feedback equalizer (DFE), the modules such as clock and data recovery (CDR) demodulate base band data, and another way passes through mould
Quasi- processing obtains the phase discrimination signal of residual carrier, is collected in FPGA by A/D, generates the residual carrier of reconstruct, and adjusts this
Ground local frequency, achievees the purpose that carrier synchronization.High-speed a/d conversion is not needed based on numerical model analysis demodulation method of the invention,
It can realize the efficient demodulation of large dynamic high speed laser signal.
Although described above is various embodiments of the present invention, however, it is to be understood that they are intended only as example to present
, and without limitation.For those skilled in the relevant art it is readily apparent that various combinations, modification can be made to it
Without departing from the spirit and scope of the invention with change.Therefore, the width of the invention disclosed herein and range should not be upper
It states disclosed exemplary embodiment to be limited, and should be defined according only to the appended claims and its equivalent replacement.
Claims (9)
1. a kind of numerical model analysis demodulation method applied to high-rate laser communication, comprising:
Coarse compensation is carried out to the carrier wave optical signal of acquisition；
Photoelectric conversion is carried out to compensated carrier wave optical signal is obtained, generates electric signal；
By the mixing orthogonal with local oscillation signal progress of the electric signal of generation, base band quadrature signal is obtained；
Base band quadrature signal is divided into two paths of signals；
First via signal is supplied to FPGA by limiter；
FPGA carries out demodulation to first via signal and obtains base band data；
Second road signal is passed through into simulation process, obtains the phase discrimination signal of residual carrier；
The phase discrimination signal of residual carrier is supplied to FPGA after A/D is converted；And
FPGA captures the phase discrimination signal of the residual carrier after A/D is converted, carries out carrier wave reconstruct after tracking processing, and
Carrier wave and analog phase-locked look PPL based on reconstruct carry out orthogonal modulation and obtain local oscillation signal.
2. the method as described in claim 1, which is characterized in that the method that the carrier wave optical signal of described pair of acquisition carries out coarse compensation
Further comprise；
Satellite-orbit information obtains carrier doppler signal；
Processing is amplified by carrier doppler signal of the image intensifer to acquisition；And
The trimmed book vibration generated by adjusting local oscillator laser carries out amplified carrier doppler signal in optical mixer unit thick
Compensation.
3. the method as described in claim 1, which is characterized in that described pair obtains compensated carrier wave optical signal and carry out photoelectricity turn
It changes, the method for generating electric signal is to be exported by balanced detector, bandpass filter and low-noise amplifier to optical mixer unit
Optical signal carry out photoelectric conversion, generate electric signal.
4. the method as described in claim 1, which is characterized in that described base band quadrature signal is divided into two paths of signals is using function
Divide device that base band quadrature signal is divided into two-way.
5. the method as described in claim 1, which is characterized in that the FPGA carries out demodulation to first via signal and obtains base band number
According to specific method be pass through decision feedback equalizer (DFE), clock and data recovery (CDR) module demodulation obtain base band data.
6. the method as described in claim 1, which is characterized in that mirror of the FPGA to the residual carrier after A/D is converted
The method that phase signals are captured further comprises:
Frequency control word is set by software and controls D/A outgoing carrier frequency；
The detection of error signals in two local frequencies；
If all not detecting error signal in two local frequencies, local frequency is adjusted, is continued in entire processing bandwidth
Interior scanning；And
If continuously all detecting error signal in two local frequencies, judge to obtain error signal frequency.
7. method as claimed in claim 6, which is characterized in that the frequency control word isWherein M is phase control
Word length processed.
8. method as claimed in claim 6, which is characterized in that the method for the detection of error signals in two local frequencies
To carry out N point FFT transform to error correction signal, search is more than the peak point m of threshold value, if the width of peak point and minor peaks point
Degree is than being greater than 10, it is determined that detects that error signal, frequency are represented byWherein N, M respectively indicate FFT length
With phase controlling word length, fsFor A/D sample frequency.
9. method as claimed in claim 6, which is characterized in that the method that the judgement obtains error signal frequency is as follows:
If local frequency is respectively fref,1And fref,2(fref,2>fref,1), corresponding peak value is P1And P2, error signal estimation frequency
For f1And f2；
If P1>P2, then error signal frequency f=fref,1+f1；
If P1<P2, then error signal frequency f=fref,2- f2。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112751624A (en) * | 2019-10-30 | 2021-05-04 | 湖南迈克森伟电子科技有限公司 | Inter-satellite laser ultra-wideband demodulation phase discrimination method |
| CN113364509A (en) * | 2021-05-10 | 2021-09-07 | 上海航天电子有限公司 | PM measurement and control system error-proof locking method and realization circuit thereof |
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| CN114499690B (en) * | 2021-12-27 | 2023-09-29 | 北京遥测技术研究所 | Ground simulation device of satellite-borne laser communication terminal |
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