CN109802719A - A kind of satellite communication system based on the interference of inhibition narrowband - Google Patents
A kind of satellite communication system based on the interference of inhibition narrowband Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/71—Interference-related aspects the interference being narrowband interference
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0066—Interference mitigation or co-ordination of narrowband interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
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Abstract
A kind of satellite communication system based on the interference of inhibition narrowband, navigation satellite are configured as follows handling the combination signal: the adding window module is configured to generation window after windowing process is defined the frequency of the combination signal and handles signal；The disturbance ecology module is configured to the n times power processing of the window processing signal to determine that at least one forms the modulating characteristic of signal and its symbol rate of corresponding carrier wave；The separation module is configured in the case where the window handles signal and generates at least one continuous wave based on n times power processing, m times of the mode based on the symbol rate handles signal resampling to the window and generates resampling signal, and determines at least one symbol track and at least one modulation type with this；It is synthetic regenerated to generate composite signal to composition signal progress that the regeneration module is configured to the symbol track and the modulation type.
Description
Technical field
The invention belongs to wireless communication technology field more particularly to a kind of satellite communication systems based on the interference of inhibition narrowband
System.
Background technique
The groundwork of Global Satellite Navigation System is to provide positioning for military and civilian, test the speed, the industry such as time service or navigation
Business, has been widely used for various weapon platforms, becomes and commonly guide means in precision guided weapon.Since satellite-signal arrives
Power up to ground is far below receiver thermal noise power, therefore is particularly susceptible to various interference.Although satellite is led
Boat system has the anti-interference ability of some strength using spread spectrum communication itself, but in face of being, for example, high-intensitive human interference
When, it is necessary to the anti-interference ability of system is improved by Anti-Jamming Technique.The receiver used now mostly uses the anti-interference side in airspace
Formula can effectively inhibit broadband interference and narrowband to interfere, but AF panel number is limited by the element number of array of antenna.Often at present
The anti-Narrow Band Interference used mainly includes time domain and two kinds of frequency domain.Time domain Anti-Jamming Technique is realized simply, but time domain is anti-dry
Disturbing algorithm needs prolonged iteration to can be only achieved stable state, can not track fast dry out and disturb.Solution in frequency domain technology relative to
Time domain Anti-Jamming Technique, does not need convergence process, can interfere fast time variant and make a response rapidly, and is unwise to the model of interference
Sense, is relatively specific for fast time variant Suppression of narrow band interference.For example, in order to improve satellite communication quality, proposes and a series of be, for example,
Suppression of narrow band interference measure based on time domain or frequency domain.Using the basic ideas of the method for the anti-narrowband interference of frequency domain are as follows: signal institute
The main information for including is retained in the phase spectrum of frequency spectrum, and amplitude spectrum only characterizes the power of signal, therefore only needs stick signal
Most of phase information can effectively restore signal.When the spectrum width that the interference of high-power narrow band occupies far smaller than expands
When the spectral bandwidth that frequency signal occupies, Suppression of narrow band interference can be realized to interference spectrum zero setting.For example, can use DFT
The inhibition of narrowband interference is realized in transformation, and DFT has the advantages that more AF panels, without simple pair of convergence process and structure, still
Since windowing process leaks the frequency spectrum of interference, so as to cause being not thorough for AF panel.
Meanwhile spatial frequency spectrum resource is limited, the promotion of the message transmission rate of satellite communication is to sacrifice information
Bandwidth is cost, so that it constantly carries out enormous impact to frequency spectrum resource.In order to avoid multiple transmitters emit same frequency range
Signal and cause homogenous frequency signal to interfere with each other so that receiver can not adjust correct information.In order to solve existing issue, frequently with
The right to use of fixed frequency range is attributed to specific user and forbids other users or service access by frequency spectrum fixed allocation mode
Divided frequency spectrum.Fixed frequency range allocation model highly desirable solves the interference generated in radio use.But with nothing
The fast development of line technology, more and more services need to access frequency spectrum, and the static allocation management mode of frequency spectrum originally makes
Frequency spectrum resource, which is unable to get, to be made full use of, so that making frequency spectrum resource more seems short.Therefore, the availability of frequency spectrum is high, transmission is fast
Rate is fastly and the research of the narrow band communication technology of long transmission distance has become certainty.
The patent document of Publication No. CN102904604B discloses a kind of narrow-band interference rejection method and device, device
It include: sef-adapting filter module, fast Fourier transform module, Suppression of narrow band interference module and inverse fast Fourier transform mould
Block, method are: being predicted to obtain narrowband interference prediction signal according to the discrete series that adaptive algorithm obtains sampling；By institute
Narrowband interference prediction signal is stated multiplied by factor K, obtains predictive factor signal, and subtract in the reception signal prediction because
Subsignal obtains the first signal；First signal is transformed into frequency domain, frequency domain is carried out to first signal on frequency domain and is fallen into
Wave processing；The second signal in time domain is converted by the first signal after the frequency domain trap and is input to the demodulation of spread-spectrum signal
Device completes Suppression of narrow band interference.The invention is before carrying out Fast Fourier Transform processing by the time domain of signal multiplied by window function
To carry out windowing process, the multiplying in time domain is equivalent to the process of convolution in frequency domain, therefore the effect of adding window is only to subtract
The secondary lobe that few interference source generates.The performance that windowing process can be improved depends on the frequency of interference source.When interference source is not on
In some sub-carrier frequencies, then spectral leakage can be generated, and narrowband interference will affect all adjacent sub-carriers.And its
Do not consider to carry out Processing for removing to inter-carrier interference yet.The invention does not also consider that the frequency of signal has overlapping each other
When to it is each composition signal separation, the availability of frequency spectrum of satellite communication system can not be improved.
Summary of the invention
Word " module " as used herein describes any hardware, software or combination thereof, is able to carry out and " mould
The associated function of block ".
For the deficiencies of the prior art, the present invention provides a kind of based on the satellite communication system for inhibiting narrowband interference, navigation
Satellite and relay station are communicatively connected to each other to carry out to the combination signal for forming signal with several in the way of multichannel
Relay transmission, the navigation satellite includes at least disturbance ecology module, adding window module, separation module and regeneration module, described
In the case that composition signal has frequency overlapping each other, the navigation satellite is configured as follows to described group
Close signal to be handled: the adding window module is configured to raw after windowing process is defined the frequency of the combination signal
Signal is handled at window；The disturbance ecology module is configured to the n times power processing of the window processing signal to determine at least one
The modulating characteristic of a composition signal and its symbol rate of corresponding carrier wave；The separation module is configured to handle signal in the window
In the case where generating at least one continuous wave based on n times power processing, m times of the mode based on the symbol rate is to the window
Processing signal resampling simultaneously generates resampling signal, and determines at least one symbol track and at least one modulation type with this；
The regeneration module be configured to the symbol track and the modulation type to the composition signal carry out it is synthetic regenerated with
Generate composite signal.
According to a kind of preferred embodiment, the navigation satellite further includes cancellation module and reversal block, described in determination
In the case that composite signal is interference signal, the navigation satellite is configured as follows carrying out the composite signal
Processing: the reversal block is configured to carry out the composite signal reversion processing to generate reversion copy；The cancellation module
It is configured to receive the copy of the combination signal and the copy of the reversion copy and the combination signal is overlapped processing
To generate first order interference suppression signal.
According to a kind of preferred embodiment, the navigation satellite further includes signal pre-processing module and interference cancellation module,
The navigation satellite is configured as follows handling the first order interference suppression signal: the signal is located in advance
Reason module is configured to establish the first multiple sine curve and the second multiple sine curve, and determines the first order interference suppression signal
Frequency content is separated with the frequency content to interference signal.The interference cancellation module is configured that dry according to described first
It disturbs and signal and the described first multiple sinusoidal execution multiplication process is inhibited to introduce intercarrier in a manner of generating shifted signal and do
It disturbs；Interference cancellation signals are obtained in the way of sub-carrier frequencies zero setting and obtain its time domain sample；According to the time domain
The mode that sample executes multiplication process with the described second multiple sine curve eliminates the inter-carrier interference.
According to a kind of preferred embodiment, the interference cancellation module obtains the interference as follows and eliminates letter
Number: the frequency of interference signal is aligned with the sub-carrier frequencies center of communication channel and is obtained with the frequency of the interference signal most
The frequency Δ f of close Fast Fourier Transform filter group；The shifted signal is successively executed into windowing process and quick Fu
Vertical leaf transformation processing is to generate frequency-region signal；By the frequency of Fast Fourier Transform filter group corresponding to the sub-carrier frequencies
Rate Δ f zero setting.
According to a kind of preferred embodiment, the signal pre-processing module is configured as: configuration has several difference filters
The filter group of wave grade, and each filtering levels include at least low pass channel and high communication channel, the low pass channel and institute
It states high communication channel and configures at least one set of discrete wavelet transform, in which: several filtering levels based on the filter group
Obtain the subband of several different frequency ranges；The signal that the subband is included can be handled respectively through wavelet transform and be decomposed to
Time frequency space several different.
According to a kind of preferred embodiment, the relay station include at least coding module and the first modulation module, it is described in
Be configured as being modulated processing to the signal as follows after station: the coding module is configured to hold the signal
Row coded treatment is to obtain encoded signal；First modulation module is configured to executing the encoded signal into serial to parallel conversion processing
To generate first branch code stream and second branch code stream, in which: execute delay disposal so that institute in the first branch code stream
It states in the case where being spaced setting code-element period between first branch code stream and the second branch code stream, the first branch
Code stream successively execute the first order filtering processing and first order modulation treatment obtain the first modulated signal, the second branch code stream according to
It is secondary to execute the first order filtering processing and second level modulation treatment the second modulated signal of acquisition；First modulated signal and institute
The second modulated signal is stated jointly through the second level modulation treatment to obtain third modulated signal, wherein the third modulation letter
Number through the second level be filtered to complete the modulation treatment.First order filtering processing is held by raised cosine FIR filter
Row, second level filtering processing are executed by bandpass filter.Signal can be adopted again after the first order is filtered due to subsequent modulation
Sample process and make signal spectrum periodic extension phenomenon occur, finally generate intersymbol interference, and in the frequency model of modulated signal
Enclose it is interior can have secondary lobe interference, reduce the quality of modulated signal so that the bit error rate increase.Second level filtering processing can be by frequency
Secondary lobe size within the scope of rate is reduced in specified decibel range, can eliminate intersymbol interference.The third modulation that modulation generates
Signal has lower peak on average power ratio compared with the prior art.And by the first order filtering processing can effectively by
The discontinuity of any phase of first branch code stream and second branch code stream is smoothly removed.
According to a kind of preferred embodiment, the coded treatment include at least following steps: signal through Bose-Chaudhuri-Hocquenghem Code handle with
BCH code is generated, the BCH code and transmission information frame collectively form several information of setting bit in the way of supplementing zero code
Subframe；In the information subframe, successively synchronized scrambling processing, RS coded treatment and convolutional encoding are handled to obtain processing data
In the case where, the processing data at least collectively constitute complete tune with carrier synchronization bit, boot sequence, unique code and postamble
Data frame processed.
According to a kind of preferred embodiment, the relay station further includes filter module, the second modulation module and frequency-variable module,
The relay station is handled the signal according further to such as under type: the encoded signal is transmitted to first to set bit rate
The filter module is transmitted to first carrier frequency after execution modulation treatment in modulation module；The filter module is configured to pair
Its received signal, which executes, to be filtered and is transmitted to second modulation module；Second modulation module is with the second carrier frequency
Its received signal is transmitted to the frequency-variable module by rate, wherein the frequency-variable module is configured to its received signal frequency conversion
To the radio frequency output frequency of setting.
According to a kind of preferred embodiment, the navigation satellite further includes demodulation module, the disturbance ecology module configuration
To calculate the mean power of signal to determine that, with the presence or absence of interference signal in subband, the demodulation module is configured to the interference
The output signal of cancellation module carries out demodulation process, in which: the described first multiple sinusoidal frequency is Δ f, and described second is multiple
Sinusoidal frequency is-Δ f.
According to a kind of preferred embodiment, the filter module is according to first filter to the first branch code stream and institute
It states second branch code stream and executes the first order filtering processing and second filter to described in third modulated signal execution
The mode of second level filtering processing is filtered its received signal；In the third modulated signal through the filtering mould
In the case that block is transmitted to second modulation module, second modulation module is with the second carrier frequency by its received signal
It is transmitted to the frequency-variable module；The first filter is raised cosine FIR filter, and the second filter is bandpass filtering
Device；The first order modulation treatment is orthogonal modulation processing, and the second level modulation treatment is in-phase modulation processing.
Advantageous effects of the invention:
(1) in an iterative process, each narrow-band interference signal is aligned the present invention with the sub-carrier frequencies center of communication channel
When will lead to the generation of inter-carrier interference.It is narrow that signal after the sub-carrier frequencies removal of narrowband interference alignment will no longer be carried this
Band interference, then removes inter-carrier interference from signal.Therefore, before decoding, it is dry just to eliminate all narrowbands for signal
It disturbs and any potential secondary lobe, and then spectral leakage can be eliminated.
(2) present invention can eliminate intersymbol interference by digital shaping filter, and then can satisfy no intersymbol interference
Nyquist characteristic, while can be with smooth waveform, and then the out-of band rejection speed of modulated signal can be accelerated, improve frequency spectrum
Utilization rate.Modulation envelope can be made rounder and more smooth by the processing of bandpass filter.
(3) present invention can receive the signal with frequency overlapping, and detect to interference signal included in it
With filter out, the utilization rate of frequency spectrum resource can be effectively improved.
Detailed description of the invention
Fig. 1 is the modularization connection relationship diagram of currently preferred satellite communication system；
Fig. 2 is the modular construction schematic diagram of currently preferred relay station；
Fig. 3 is the modulation treatment flow diagram of currently preferred first modulation module；
Fig. 4 is the modular construction schematic diagram of currently preferred navigation satellite；
Fig. 5 is the processing flow schematic diagram of currently preferred interference cancellation module；
Fig. 6 is the coding block diagram of currently preferred RS code；
Fig. 7 is the coding block diagram of currently preferred convolutional code；
Fig. 8 is the processing flow schematic diagram of currently preferred coding module；
Fig. 9 is the modular construction schematic diagram of currently preferred another navigation satellite；With
Figure 10 is processing flow schematic diagram of the currently preferred navigation satellite to combination signal.
Reference signs list
1: navigation satellite 2: relay station
101: disturbance ecology module 102: interference cancellation module 103: demodulation module
104: signal pre-processing module 105: analog-to-digital conversion module 106: adding window module
107: separation module 108: regeneration module 109: Postponement module
110: cancellation module 111: reversal block
201: 202: the first modulation module 203 of coding module: filter module
204: the second modulation modules 205: frequency-variable module
102a: the 102b: the first multiplication unit of offset logic circuit 102c: window function circuit
102d: the first fast Fourier transform unit 102e: interference cancellation circuit
102f: fast Flourier inverse transformation circuit 102g: the 102h: the second multiplication unit of correcting circuit
102i: the second fast Fourier transform unit the 2b: the second relay station of the 2a: the first relay station
203a: first filter 203b: second filter
202a: the first the 202b: the second modulator of modulator 202c: third modulator
Specific embodiment
It is described in detail with reference to the accompanying drawing.
Embodiment 1
The present invention provides a kind of satellite communication system based on the interference of inhibition narrowband, includes at least at least one navigation satellite
1 relay station 2 to communicate with one another with several.For example, as shown in Figure 1, multichannel satellite communication system includes navigation satellite 1,
One relay station 2a and the second relay station 2b.Received data-signal can be sent to navigation satellite 1 by the first relay station 2a,
And then it is relayed by navigation satellite 1 to the second relay station 2b.Similarly, the second relay station 2b can also be by received number
It is believed that number being relayed to the first relay station 2a by navigation satellite 1.First relay station 2a and the second relay station 2b can individually have
Its respective gateway, and all gateways can be communicatively coupled with one another together by common network.
Preferably, as shown in Fig. 2, relay station 2 includes at least coding module 201, the first modulation module 202, filter module
203, the second modulation module 204 and frequency-variable module 205.Coding module 201 is used for the primary data information (pdi) received to relay station 2
Encode and the digital signal after coding is transmitted to the first modulation module 202 according to the bit rate of setting.First modulation mould
Block 202 is for being modulated digital signal will be converted to the first carrier frequency of setting.It is modulated through the first modulation module 202
Digital data transmission afterwards is filtered into filter module 203.It is filtered through 203 coding module 201 of filter module
Digital data transmission afterwards is modulated into the second modulation module 204 again to be converted to the second carrier frequency of setting.Tool
There is the digital data transmission of the second carrier frequency into frequency-variable module 205.Frequency-variable module 205 is used for the second modulation module 204
It handles obtained digital signal and is converted to the launching frequency of setting in order to be uploaded to navigation satellite 1.
Preferably, coding module 201 can be configured as based on loop coding or convolutional encoding to primary data information (pdi) into
Row coding.First modulation module 202 and the second modulation module 204 can be based on digital phase modulation, multi-system digit phase tune
One of system, phase-shift keying (PSK) modulation, the modulation of quadrature phase keying modulation, offset quadrature phase-shift-keying or a variety of combination logarithms
Word signal is modulated.Filter module 203 can be digital shaping filter, can eliminate intersymbol by digital shaping filter
Interference, and then can satisfy the nyquist characteristic of no intersymbol interference, while can be with smooth waveform, and then can accelerate to modulate
The out-of band rejection speed of signal improves the availability of frequency spectrum.
Preferably, frequency-variable module 205 can be programmable phase-locked loop chip, and the frequency dividing by configuring phase-locked loop chip is deposited
Modulated signal can be converted to the radio frequency reference frequency output of setting by the parameter of device, while pass through setting frequency partition interval again
The frequency intervals such as usable spectrum can be divided into several carrier channels.Dividing the spectrum into multiple channels can be promoted
The utilization rate of frequency spectrum.For example, if available frequency band is 100.0000MHz~100.0100MHz, if being divided into 100Hz between frequency partition,
The frequency range can be then divided into 100 channels.Pass through the available narrow band signal of frequency-variable module.And then realize relay station 2 with
Narrowband multichannel communication between navigation satellite 1.
Preferably, relay station 2 can will be sent after the coded treatment of the encoded module of initial data with the bit rate of 600bps
Enter in the first modulation module 202 and is modulated processing.First modulation module 202 is transmitted to filtering mould with the carrier frequency of 15KHz
It is filtered in block 203.Second modulation module 204 modulated signal of 15KHz is modulated again so that its with
The carrier frequency of 10.685MHz is transmitted to frequency-variable module 205.
Preferably, as shown in figure 3, the first modulation module 202 is additionally configured to according to following working method to coding mould
The encoded signal that the processing of block 201 obtains is modulated processing:
S1: encoded signal is handled through serial to parallel conversion to generate first branch code stream and second branch code stream, wherein first
Road code stream and second branch code stream are spaced each other setting code-element period in the way of delay disposal.
Specifically, encoded signal is after serial to parallel conversion processing generates first branch code stream and second branch code stream, first
Tributary binary digits and the respective bit rate of second branch code stream are the half of encoded signal bit rate.First branch code stream can be with
Signal transmission is carried out in the way of serial transmission, second branch code stream can carry out signal biography in the way of parallel transmission
It is defeated.Setting code-element period can be half of code-element period.By any one warp in first branch code stream or second branch code stream
Cross half of the code-element period that just first branch code stream and second branch code stream can be staggered after the delay process of half of code-element period.
S2: by first branch code stream carry out half of code-element period delay process in the case where, first branch code stream and
Second branch code stream is transmitted separately to be filtered in filter module 203 according to one-to-one mode, wherein filtering mould
Block 203 includes at least first filter 203a and second filter 203b, and first branch code stream and second branch code stream are according to one
One corresponding mode, which is transmitted in first filter 203a, to be filtered.First can be executed by first filter 203a
Grade filtering processing.
Specifically, first filter 203a is digital shaping filter.Digital shaping filter can be raised cosine roll off
Filter can change the forming waveform of encoded signal, make so as to reduce sampling timing error by controlling rolloff-factor
At influence.The frequency response H (f) of raised cosine FIR filter can be indicated by following formula:
Wherein, corresponding time domain waveform function are as follows:
Wherein, code-element period Ts=1/2fN, fNFor Kui Naisi distinct frequence.α is roll-off factor, determines the shape of H (f), α
The value between [0,1].When α is larger, time domain waveform attenuation block and oscillation and fluctuation is smaller, be conducive to reduce intersymbol interference and
The influence of timing error, but band occupancy broadens, and band efficiency reduces, and influence of the in-band noise to signal also can be corresponding
Increase.When α is smaller, band efficiency increases, and the influence of in-band noise is weakened, but oscillating waveform rises and falls and increases, to code
Between interference and timing error influence increase, eventually lead to the raising of the bit error rate.Preferably, roll-off factor α can be chosen for
0.5, the order of digital shaping filter is set as 32 ranks.
S3: first branch code stream and second branch code stream after first filter 203a is filtered pass respectively
It transports in the first modulation module 202 and is modulated processing.
Specifically, the first modulation module 202 includes at least the first modulator 202a, the second modulator 202b and third is modulated
Device 202c.First modulator 202a is quadrature modulator, and the second modulator 202b and third modulator 202c are in-phase modulations
Device.First branch bit stream carries out orthogonal modulation processing into the first modulator 202a to obtain the first modulated signal, and second
Tributary binary digits, which are transmitted in the second modulator, carries out in-phase modulation processing to obtain the second modulated signal.First modulated signal and
The equal uniform transmission of two modulated signals carries out in-phase modulation processing into third modulator 202c to obtain third modulated signal.Pass through
First modulator 202a can execute first order modulation treatment.It can be held by second modulation its 202b and third modulator 202c
Row second level modulation treatment.
S4: third modulated signal, which is transmitted to, to be filtered to complete the tune to encoded signal in second filter 203b
System processing.
Specifically, second filter 203b is bandpass filter, the signal in particular frequency range is allowed to pass through, it can
Signal outside particular frequency range is decayed into very low level.Modulation resampling process of the encoded signal based on modulation module, makes
Obtaining signal spectrum will appear periodic extension and generates intersymbol interference, and then the bit error probability of modulation module is caused to increase.Preferably,
The order of bandpass filter can be set as 64 ranks.Modulation envelope can be made rounder and more smooth by the processing of bandpass filter.
Second level filtering processing can be executed by second filter 203b.
Embodiment 2
The present embodiment is the further improvement to embodiment 1, and duplicate content repeats no more.
Referring again to Fig. 1, the first signal can be sent to navigation satellite 1 by the first relay station 2a, and then be defended by navigation
First signal is relayed to the second relay station 2b by star 1.When second signal is transmitted to navigation satellite by the second relay station 2b, second
The echo and the first signal that relay station 2b can receive second signal simultaneously are as combination signal.Similarly, the first relay station 2a
The echo and second signal that the first signal can be received simultaneously are as combination signal.First relay station 2a and the second relay station 2b
The interference as caused by echo can be eliminated by method for echo cancellation, it can be in favor of the first signal and the by eliminating echo
The demodulation of binary signal.The first signal and the second signal will receive varying environment and different degrees of interference in transmission process, from
And the echo and noise basis of transmitting signal, transmitting signal that the combination signal for causing relay station to receive at least needs to transmit
Bottom.The transmitting signal for needing to transmit refer to need the first signal for being transmitted between the first relay station and the second relay station or
Second signal.Noise floor refers to the summation of noise source and unwanted signal all in communication system, i.e., except transmitting signal
Except any other signal.
Preferably, as shown in figure 4, navigation satellite 1 includes at least signal pre-processing module 104.Signal pre-processing module 104
Including several filters to realize the decomposition to combination signal, analysis or inhibit interference signal.104 quilt of signal pre-processing module
It is configured to as follows handle combination signal:
S1: Fast Fourier Transform processing is carried out to determine the frequency content of combination signal to combination signal.For example, signal
Preprocessing module 104 may include fast Fourier transformer, and combination signal is transmitted to fast Fourier transformer and just can
Realize the Fast Fourier Transform of combination signal.Fast Fourier transformer can will combine the product and frequency of sample of signal
Multiple sine curve is added to obtain the frequency domain representation of combination signal, wherein the treatment process of fast Fourier transformer can be with table
It is shown as: xnIt is the numeral sample for combining signal.N is the total sample number handled.
S2: fast fourier transformed treated that output signal obtains multiple and different time frequency spaces through resolution process
Decomposed signal.Specifically, output signal can be transferred into filter group, filter group may include filtering several different
Grade.Each filtering levels may include low pass channel and high communication channel, and low pass channel and high communication channel do not configure respectively
One group of discrete wavelet transform.If output signal can be divided into the son of each and every one different frequency range by different filtering levels
Band, the signal that different sub-band is included can be handled through the wavelet transform of discrete wavelet transform and be decomposed to multiple and different
Time frequency space, so as to separate the time-frequency content for emitting signal with the frequency content of interference signal.
Preferably, referring again to Fig. 4, navigation satellite 1 includes at least disturbance ecology module 101,102 and of interference cancellation module
Demodulation module 103.Navigation satellite 1 can have the signal receiving module of e.g. antenna, so can receive relay station 2 or its
The signal of his Signal Terminal transmission.Several different sons that disturbance ecology module 101 is used to export signal pre-processing module 104
Signal carries out Interference Detection in band, and then can determine frequency corresponding to all interference sources in the presence of combining signal.It is dry
Disturb cancellation module 102 for for disturbance ecology module detect determine interference source be e.g. filtered, thus realize do
The elimination disturbed.Demodulation module 103 is used to demodulate signal the further transmission in order to signal.Preferably, disturbance ecology
Module 101 can calculate the mean power of combination signal and level threshold value is arranged.When the group that disturbance ecology module analysis determines
The actual power for closing signal is higher than the level threshold value of setting, then may determine that in the presence of interference.It can be by being carried out to interference signal
Simulated in advance to determine the setting value of level threshold value in advance.
Preferably, as shown in figure 5, interference cancellation module 102 may include offset logic circuit 102a, the first multiplication unit
102b, window function circuit 102c, the first fast Fourier transform unit 102d, interference cancellation circuit 102e, fast Flourier are inverse
Translation circuit 102f and peaking circuit 102g.Offset logic circuit 102a is used for the frequency and communication channel of interference signal
The center frequency of subcarrier be aligned, offset logic circuit can determine the frequency and fast Fourier transform of interference signal
Difference between the centre frequency of filter group frequency Δ f, and offset logic circuit can be filtered from fast Fourier transform
The determining one or more closest with the frequency of interference signal in device group frequency.Preferably, offset logic circuit can also
Create the first multiple sine curve about the signal received with for executed in the first multiplication unit 102b analog signal that
Multiplication between this.First multiple sinusoidal frequency can be indicated with-Δ f, and the first multiple sine curve can be by such as
Lower formula(n=0,1 ..., N-1) is indicated.FsIndicate sample frequency.N is Fast Fourier Transform sampling
Points.First multiplication unit 102b can receive the first multiple sine curve and combination signal from offset logic circuit, wherein
Combine the sample in signal comprising interference signal.First multiplication unit 102b answers sine curve and sample phase for first
Multiplied by acquisition shifted signal.Meanwhile inter-carrier interference can also be drawn by the way that the first multiple sine curve is multiplied with sample
Enter in the first multiplication unit 102b.
Preferably, window function circuit 102c is used to receive the output of the first multiplication unit 102b, and carries out at adding window to it
Reason.Window function circuit can be used e.g. Hanning window function, rectangular window function or Bart's benefit window function and carry out adding window to signal
Processing.It can be by the export-restriction of the first multiplication unit 102b on main lobe by windowing process.First Fast Fourier Transform
Unit 102d is capable of the output of Receiver Windows circuit 102c, and executes Fast Fourier Transform processing to it to generate frequency domain letter
Number.Interference cancellation circuit 102e can be received by the first fast Fourier transform unit 102d quick Fourier that treated demodulates
Leaf transformation signal, and interference cancellation circuit 102e can by Fast Fourier Transform signal by offset logic circuit 102a
Identified sub-carrier frequencies are removed to obtain interference cancellation signals during calculating Δ f.Specifically, being counted for Δ f
Sub-carrier frequencies involved in during calculating, interference cancellation circuit 102e can be by quick Fourier corresponding to the sub-carrier frequencies
Leaf switched filter group set of frequency is zero.Due to the frequency of interference signal handled through offset logic circuit 102a and with son
The center frequency of carrier wave is aligned, and the disturbed circuit 102e that eliminates of the frequency of current sub-carrier is set as zero, so that interference
Signal is eliminated.Preferably, interference cancellation signals can be transmitted to fast Flourier inverse transformation circuit 102f and be performed fast
Fast inverse fourier transform processing is to generate time-domain sampling sample.Preferably, correcting circuit 102g is configurable to generate frequency and is equal to
The ramp signal of Δ f, the ramp signal can pass through the second multiple sine curve(n=0,1 ..., N-1) is carried out
It indicates.To which correcting circuit 102g can eliminate inter-carrier interference.Specifically, the second multiple sine generated by correcting circuit 102g
The output signal simultaneous transmission that curve is generated with fast Flourier inverse transformation circuit 102f is carried out into the second multiplication unit 102h
Processing be multiplied to eliminate inter-carrier interference.Preferably, the output signal of the second multiplication unit 102h can be transmitted to second quickly
Fast Fourier Transform processing is carried out in Fourier transformation unit 102i again to carry out demodulation process to the signal.Second quickly
The output signal of Fourier transformation unit 102i, which is finally transmitted in demodulation module 103, is decoded processing.Preferably, first is fast
Fast Fourier transformation unit 102d and the second fast Fourier transform unit 102i limit fast Fourier transform filter jointly
Group.
Preferably, in an iterative process, when each narrow-band interference signal is aligned with the sub-carrier frequencies center of communication channel
It will lead to the generation of inter-carrier interference.Signal after the sub-carrier frequencies removal of narrowband interference alignment will no longer be carried into the narrowband
Interference, then removes inter-carrier interference from signal.Therefore, before decoding, signal just eliminates all narrowband interference
And any potential secondary lobe, and then spectral leakage can be eliminated.
Embodiment 3
The present embodiment is the further improvement to previous embodiment, and duplicate content repeats no more.
Preferably, when communicating with one another with relay station 2, navigation satellite 1 also can receive to be made of navigation satellite 1 a variety of
The combination signal of signal composition.Combination signal may include desired signal and interference signal, and desired signal refers to needs by leading
The satellite 1 that navigates carries out the signal of relay transmission.Navigation satellite 1 further includes analog-to-digital conversion module 105, adding window module 106, separation module
107, regeneration module 108, Postponement module 109, cancellation module 110 and reversal block 111.It is built between navigation satellite 1 and relay station 2
Vertical channel transmission, the signal of channel transmission can have frequency overlapping each other, and then can be improved frequency spectrum resource
Utilization rate.
Preferably, navigation satellite 1 is configured as follows separating the combination signal being overlapped with frequency
Processing:
S1: windowing process is executed based on adding window module 106 to obtain window processing signal, and is based on disturbance ecology module 101
The processing of n times power is executed to window processing signal and determines the modulating characteristic of composition signal and the symbol of the corresponding carrier wave of composition signal
Rate.
Specifically, the combination signal that analog-to-digital conversion module 105 is used to receive navigation satellite carries out analog-to-digital conversion to incite somebody to action
Analog signal is converted to digital signal.The combination signal that navigation satellite 1 receives be first transmitted in analog-to-digital conversion module 105 into
Row analog-to-digital conversion process is to generate digital signal.Adding window module 106, which can be received, handles the number generated through analog-to-digital conversion module 105
Word signal, adding window module 106 can limit the bandwidth of digital signal or pay close attention to a part of digital signal to guarantee that it can
The portions of the spectrum of desired signal is effectively treated, and then window processing signal can be generated.Disturbance ecology module 101 can connect
It receives window processing signal and identification determination is carried out to its signal constituent.For example, disturbance ecology module 101 is configurable to window
It handles signal and executes the processing of n times power until being converted into continuous wave.It include a variety of unlike signals in signal when window is handled
When, such as may include two desired signals and three interference signals, different signals due to different modulating characteristics, into
And multiple and different n times power processing can be formed, that is, window processing signal may can obtain one when executing the processing of 4 power
A continuous wave, when executing 8 power again another available continuous wave.Window processing signal with 5 kinds of signals can be in 5
Different n times power generates 5 continuous waves independent of each other.The processing of n times power is executed according to 2 multiple, it can executes 2
Power processing, the processing of 4 power, the processing of 6 power etc..Preferably, when executing the processing of n times power, in such a way that every grade is incremented by 2 grades
It is executed.For example, successively executing 4 power in the case where not generating continuous wave when executing the processing of 2 power and handling, at 6 power
Reason, the processing of 8 power etc..Preferably, the modulating characteristic for forming signal at least can be inclined by forming phase offset, the frequency of signal
It moves, one of bandwidth and time delay or a variety of be determined.The waveform of the continuous wave formed after being handled by n times power
To determine phase offset, frequency shift (FS), bandwidth and time delay.
Preferably, it can be carried out based on symbol rate of the n times power treatment process to window processing signal to window processing signal true
It is fixed.For example, when signal is during executing the processing of n times power, the phase of symbol can generate interrelated or will be mutual mutual
Incidence relation is eliminated, and then is capable of forming the continuous wave indicated by the single-frequency in frequency domain, which can generate and be distributed in
The small secondary lobe of the frequency components of continuous wave, interval between small secondary lobe and the symbol rate phase of the corresponding carrier wave for forming signal
It closes, and then can be determined based on symbol rate of the interval between small secondary lobe to carrier wave.
S2: in the case where window processing signal is based on n times power processing at least one continuous wave of generation, separation module 107 is pressed
Resampling is carried out to generate resampling signal to window processing signal according to m times of the mode based on symbol rate, and is determined at least with this
One symbol track and at least one modulation type.
Preferably, when disturbance ecology module 101, which determines, has multiple composition signals in combination signal, window handles signal can
To be transmitted in separation module 107, separation module can based on determining modulating characteristic in a manner of m times of symbol rate to window at
It manages signal and carries out resampling.I.e. separation module 107 is to be sampled with higher rate to its received signal, and then can
Export symbol track, the shaping factor and modulation type.The shaping factor can be used for evaluating the intensity or dispersion of signal energy
Degree.For example, the shaping factor can be the root raised cosine frequency spectrum of window processing signal.Preferably, different composition signals can be not
Multiple continuous waves are generated in same n times power treatment process.For example, being modulated using binary phase keying mode to signal
When, continuous wave can be generated when the processing of two power.It, can be four when being modulated using quadrature phase shift keying mode to signal
Continuous wave is generated when power processing.Therefore, it is possible to determine the modulation type of signal according to the involution number that n times power is handled.M's can
To be greater than 2 integer.
Preferably, regeneration module 108 is based at least one symbol track and at least one modulation type to each composition
Signal is synthesized to generate composite signal, in the case where determining composite signal is interference signal, 111 pairs of reversal block synthesis
Signal carries out reversion processing to generate reversion copy, and the copy delay of digital signal is transmitted to cancellation module by Postponement module 109
In 110, the copy for inverting copy and digital signal is overlapped processing to eliminate interference signal, in turn by cancellation module 110
First order interference suppression signal can be obtained.
Preferably, as shown in figure 9, first order interference suppression signal can be transmitted in signal pre-processing module 101 carries out
Processing is to separate the time-frequency content for emitting signal with the frequency content of interference signal.At signal pre-processing module 101
First order interference suppression signal after reason, which can be transmitted in interference cancellation module 102, further eliminates interference signal.
Embodiment 4
The present embodiment is the further improvement to previous embodiment, and duplicate content repeats no more.
Preferably, as shown in figure 8, coding module 201 is additionally configured to carry out coded treatment to signal as follows:
S1: the BCH code that signal is generated after Bose-Chaudhuri-Hocquenghem Code is handled and information for sending information frame composition setting bit
Frame, wherein in the case where the bit length of information subframe is unsatisfactory for setting bit length, to it in the way of 0 yard of supplement
Carry out polishing.
Specifically, the signal of a bit is by BCH, (b, a) coding can obtain the BCH code output of b bit, by b bit
BCH code and the information subframe for sending information frame composition c bit.For example, b, which can be set as 31, c, can be set to 223.
Preferably, the generator polynomial of BCH code can pass through formula g (x)=x10+x9+x8+x6+x5+x3+ 1 is indicated.
S2: the synchronized scrambling processing of information subframe.When sending longer 0 yard or 1 yard continuous continuous in digital communication,
It will receive the interference of electromagnetic field present in space transmission channel, to generate error code.Scrambling code is a n pseudo-random sequence, by n sequence
The linear feedback of column carries out being added the frequency of occurrence that can balance 0 yard and 1 yard with data, can convert the data into approximate white noise
Sound reduces the decline and the bit error rate of spacing wave.Specifically, the scrambling code period of synchronous scrambling processing can be set as 215- 1,
Multinomial is 1+X14+X15, originating register value be 1001_0101_0000_000 n sequence, by all data after framing into
Row scrambling processing.
S3: scrambled treated that subframe successively carries out RS coding and convolutional encoding.For example, the design parameter of RS coding can
As follows to configure: code length n=255 supervises end k=223, generator polynomial g (x)=x8+x4+x3+x2+1.Convolutional encoding has 1
A input port and 2 output ports, the corresponding generator polynomial of two output ports are g1 (x)=x6+x5+x4+x3+1
With g2 (x)=x6+x4+x3+x1+1。
Preferably, Fig. 6 shows the coding block diagram of RS code, and input message polynomial h (x) removal g (x) obtains residue r
(x), r (x) is spliced to the tail portion of h (x), obtains output codons.Specifically, h (x) is directly exported by gate A, and h
(x) enter RS checking circuit, at this time the output open circuit of checking circuit, after 223 elements, which fully enter, examines circuit, several
It is RS check bit that data are stored in register.The output open circuit of checking circuit at this time, check bit is exported, and completes r (x) splicing extremely
The tail portion of h (x), to constitute the RS coded data of 255 bits.
Preferably, Fig. 7 shows the coding block diagram of convolutional code, and code rate is 3/4 bit/symbol, and constraint length is 7 bits,
Connected vector G1=1111001, G2=1011011.Output is determined by puncturing schemes, wherein C1:101, C2:110,1 indicate quilt
The symbol of transmission, 0 indicates the symbol not transmitted.Shift register is used for stored bits information, and the code stream sequence of output enters
Code stream sequence is divided into two branches while shift register, carries out two-way XOR operation respectively.The operation of the first branch is more
Xiang Shiwei g1 (x), the operation multinomial of second branch are g2 (x).Operation result can be sent by the first branch and second branch
Perforation unit, wherein the operation result of two branches alternately enters in perforation unit, and perforation unit moves continuous 6 bit data
Position is divided into one group, and every group of entering order is C1(1)C2(1)C1(2)C2(2)C1(3)C2(3)….Last perforation unit is according to beating
One group of data is carried out the punctured output of convolutional encoding 3/4 by hole scheme, and the sequence of output sequence is C1(1)C2(1)C2(2)C1
(3)…。
S4: the data generated after convolutional encoding and carrier synchronization bit, boot sequence, unique code, postamble are collectively constituted
Complete modulation data frame.For example, the data generated after convolutional encoding can draw with 320 bit carrier synchronization bits, 160 bits
It leads sequence, 64 bit unique codes, 64 bit postambles and collectively constitutes complete modulation data frame.It is organic by carrying out coding mode
Combination, the bit error rate of the assembly coding mode of formation is low, confidentiality is high, the availability of frequency spectrum is high.
It should be noted that above-mentioned specific embodiment is exemplary, those skilled in the art can disclose in the present invention
Various solutions are found out under the inspiration of content, and these solutions also belong to disclosure of the invention range and fall into this hair
Within bright protection scope.It will be understood by those skilled in the art that description of the invention and its attached drawing are illustrative and are not
Constitute limitations on claims.Protection scope of the present invention is defined by the claims and their equivalents.
Claims (10)
1. a kind of based on the satellite communication system for inhibiting narrowband interference, navigation satellite (1) is with relay station (2) according to the side of multichannel
Formula is communicatively connected to each other to carry out relay transmission to the combination signal for forming signal with several, which is characterized in that described to lead
Satellite (1) is navigated including at least disturbance ecology module (101), adding window module (106), separation module (107) and regeneration module
(108), between the composition signal have frequency overlapping in the case where, the navigation satellite (1) be configured as according to
As under type handles the combination signal:
The adding window module (106) is configured to generate at window after windowing process is defined the frequency of the combination signal
Manage signal；
The disturbance ecology module (101) is configured to the n times power processing of the window processing signal to determine at least one group
At the modulating characteristic of signal and its symbol rate of corresponding carrier wave；
The separation module (107) is configured to generate at least one continuously based on n times power processing in window processing signal
In the case where wave, m times of the mode based on the symbol rate handles signal resampling to the window and generates resampling signal, and
At least one symbol track and at least one modulation type are determined with this；
The regeneration module (108) is configured to the symbol track and the modulation type and closes to the composition signal
At regeneration to generate composite signal.
2. satellite communication system as described in claim 1, which is characterized in that the navigation satellite (1) further includes cancellation module
(110) and reversal block (111), in the case where determining the composite signal is interference signal, the navigation satellite (1) is matched
It is set to and the composite signal is handled as follows:
The reversal block (111) is configured to carry out the composite signal reversion processing to generate reversion copy；
The cancellation module (110) is configured to receive the copy of the combination signal and believes the reversion copy and the combination
Number copy be overlapped processing to generate first order interference suppression signal.
3. satellite communication system as claimed in claim 2, which is characterized in that the navigation satellite (1) further includes that signal is located in advance
Reason module (104) and interference cancellation module (102), the navigation satellite (1) are configured as follows to described first
Grade interference suppression signal is handled:
The signal pre-processing module (104) is configured to establish the first multiple sine curve and the second multiple sine curve, and determines institute
The frequency content of first order interference suppression signal is stated to separate with the frequency content to interference signal；
The interference cancellation module (102) is configured that
According to first interference suppression signal with the described first multiple sinusoidal execution multiplication process to generate shifted signal
Mode introduce inter-carrier interference；
Interference cancellation signals are obtained in the way of sub-carrier frequencies zero setting and obtain its time domain sample；
The intercarrier is eliminated in such a way that the time-domain sampling sample executes multiplication process with the described second multiple sine curve
Interference.
4. satellite communication system as claimed in claim 3, which is characterized in that the interference cancellation module (102) is according to as follows
Mode obtains the interference cancellation signals:
The frequency of interference signal is aligned with the sub-carrier frequencies center of communication channel and obtains the frequency with the interference signal
The frequency Δ f of immediate Fast Fourier Transform filter group；
The shifted signal is executed into windowing process and Fast Fourier Transform processing successively to generate frequency-region signal；
By the frequency Δ f zero setting of Fast Fourier Transform filter group corresponding to the sub-carrier frequencies.
5. satellite communication system as claimed in claim 4, which is characterized in that the signal pre-processing module (104) is configured
Are as follows:
The filter group with several different filtering levels is configured, and each filtering levels include at least low pass channel and height
Communication channel, the low pass channel and the high communication channel configure at least one set of discrete wavelet transform, in which:
Several filtering levels based on the filter group obtain the subband of several different frequency ranges；
The signal that the subband is included can handle respectively through wavelet transform and decompose to time frequency space several different.
6. satellite communication system as claimed in claim 5, which is characterized in that the relay station (2) includes at least coding module
(201) and the first modulation module (202), the relay station (2) are configured as follows being modulated the signal
Processing:
The coding module (201) is configured to execute coded treatment to the signal to obtain encoded signal；
First modulation module (202) is configured to execute the encoded signal serial to parallel conversion processing to generate first branch code
Stream and second branch code stream, in which:
The first branch code stream execute delay disposal so that the first branch code stream and the second branch code stream that
Between this in the case where interval setting code-element period, the first branch code stream successively executes first order filtering processing and the first order
Modulation treatment obtains the first modulated signal, and the second branch code stream successively executes the first order filtering processing and second level tune
System processing obtains the second modulated signal；
First modulated signal and second modulated signal are jointly through the second level modulation treatment to obtain third modulation
Signal, wherein the third modulated signal is filtered through the second level to complete the modulation treatment.
7. satellite communication system as claimed in claim 6, which is characterized in that the coded treatment includes at least following steps:
Signal is handled through Bose-Chaudhuri-Hocquenghem Code to generate BCH code, and the BCH code and transmission information frame are common in the way of supplementing zero code
Constitute several information subframes of setting bit；
In the information subframe, successively synchronized scrambling processing, RS coded treatment and convolutional encoding are handled to obtain processing data
In the case of, the processing data at least collectively constitute complete modulation with carrier synchronization bit, boot sequence, unique code and postamble
Data frame.
8. satellite communication system as claimed in claim 7, which is characterized in that the relay station (2) further includes filter module
(203), the second modulation module (204) and frequency-variable module (205), the relay station (2) is according further to such as under type to the signal
It is handled:
The encoded signal is transmitted in the first modulation module (202) after execution modulation treatment with setting bit rate with first carrier
Frequency is transmitted to the filter module (203)；
The filter module (203) is configured to execute its received signal and is filtered and is transmitted to second modulation module
(204)；
Its received signal is transmitted to the frequency-variable module (205) with the second carrier frequency by second modulation module (204),
Wherein, the frequency-variable module (205) is configured to for its received signal to be converted to the radio frequency output frequency of setting.
9. satellite communication system as claimed in claim 8, which is characterized in that the navigation satellite (1) further includes demodulation module
(103), the disturbance ecology module (101) is configured to calculate the mean power of signal to determine in subband with the presence or absence of interference letter
Number, the demodulation module (103) is configured to carry out demodulation process to the output signal of the interference cancellation module (102), in which:
Described first multiple sinusoidal frequency is Δ f, and the described second multiple sinusoidal frequency is-Δ f.
10. satellite communication system as claimed in claim 9, which is characterized in that the filter module (203) is according to the first filtering
Device (203a) executes the first order filtering processing and the second filter to the first branch code stream and the second branch code stream
The mode that wave device (203b) executes the second level filtering processing to the third modulated signal filters its received signal
Wave processing；
In the case where the third modulated signal is transmitted to the second modulation module (204) through the filter module (203),
Its received signal is transmitted to the frequency-variable module (205) with the second carrier frequency by second modulation module (204)；
The first filter (203a) is raised cosine FIR filter, and the second filter (203b) is bandpass filter；
The first order modulation treatment is orthogonal modulation processing, and the second level modulation treatment is in-phase modulation processing.
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| CN201910005961.4A CN109802719B (en) | 2019-01-03 | 2019-01-03 | Satellite communication system based on narrow-band interference suppression |
| CN202010404801.XA CN111698022B (en) | 2019-01-03 | 2019-01-03 | Satellite communication system based on narrow-band multi-channel communication interference suppression |
| CN202010404805.8A CN111628816B (en) | 2019-01-03 | 2019-01-03 | Narrow-band interference suppression method of satellite communication system |
| PCT/CN2019/121951 WO2020134855A1 (en) | 2018-12-28 | 2019-11-29 | Satellite communication system |
| CN201980086573.1A CN113454919B (en) | 2018-12-28 | 2019-11-29 | Satellite communication system |
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| CN202010404805.8A Division CN111628816B (en) | 2019-01-03 | 2019-01-03 | Narrow-band interference suppression method of satellite communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020134855A1 (en) * | 2018-12-28 | 2020-07-02 | 长沙天仪空间科技研究院有限公司 | Satellite communication system |
| CN112054820A (en) * | 2019-06-06 | 2020-12-08 | 天地融科技股份有限公司 | Method and apparatus for transmitting and receiving data using power line |
| CN112054819A (en) * | 2019-06-06 | 2020-12-08 | 天地融科技股份有限公司 | Method and apparatus for transmitting and receiving data using power line |
| CN113938158A (en) * | 2020-07-13 | 2022-01-14 | 亚信科技（中国）有限公司 | Interference suppression method applied to pulse ultra-wideband communication system and receiver |
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| CN111698022B (en) * | 2019-01-03 | 2022-02-08 | 长沙天仪空间科技研究院有限公司 | Satellite communication system based on narrow-band multi-channel communication interference suppression |
| CN112787968B (en) * | 2020-12-30 | 2022-07-05 | 中国工程物理研究院电子工程研究所 | Low-delay multi-node real-time wireless network transmission method based on radio frequency forwarding |
| CN112804011B (en) * | 2020-12-31 | 2021-10-15 | 中国人民解放军32039部队 | Communication satellite interference suppression method and device and electronic equipment |
| CN113824488B (en) * | 2021-09-09 | 2022-07-08 | 中国电子科技集团公司第五十四研究所 | Satellite communication non-malicious interference suppression method based on decision feedback adaptive cancellation |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN111628816A (en) | 2020-09-04 |
| CN111698022A (en) | 2020-09-22 |
| CN109802719B (en) | 2020-07-17 |
| CN111698022B (en) | 2022-02-08 |
| CN111628816B (en) | 2022-02-01 |
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Denomination of invention: A Satellite Communication System Based on Suppressing Narrowband Interference Effective date of registration: 20231204 Granted publication date: 20200717 Pledgee: Bank of Changsha Limited by Share Ltd. science and Technology Branch Pledgor: SPACETY Co.,Ltd. (CHANGSHA) Registration number: Y2023980069087 |