CN106506063A - A kind of satellite communication method - Google Patents
A kind of satellite communication method Download PDFInfo
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- CN106506063A CN106506063A CN201610899600.5A CN201610899600A CN106506063A CN 106506063 A CN106506063 A CN 106506063A CN 201610899600 A CN201610899600 A CN 201610899600A CN 106506063 A CN106506063 A CN 106506063A
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- antenna
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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
- H04B7/204—Multiple access
-
- 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
- H04B7/204—Multiple access
- H04B7/208—Frequency-division multiple access [FDMA]
Abstract
The invention discloses a kind of satellite communication method, which is used for the transmission for realizing the N number of channel data between satellite and master controller., equipped with transmitting terminal on star and satellite reception end, the master controller is equipped with the M ground station reception end corresponding with transmitting terminal on the star and M earth station's transmitting terminal corresponding with the satellite reception end for the satellite.On the star, transmitting terminal has M transmitting antenna for being respectively directed to M ground station reception end and a M reception antenna for pointing to M earth station's transmitting terminal, and each earth station is also to should transmitting terminal and satellite reception end setting 1 reception antenna of identical and 1 transmitting antenna on star.The present invention relates to carrying out the star ground feeding transmission of multiple channel datas using the technological approaches that spatial reuse, frequency division multiplexing and polarization multiplexing combine, relatively conventional time division multiplex and code division multiplexed transmission mode, simple for structure clear, there is no the Digital Signal Processing and high-precise synchronization demand of complexity, it is easily achieved, reliable and stable.
Description
Technical field
The present invention relates to the transmission means in satellite communication, specifically a kind of satellite communication method, it is related to spatial reuse, frequently
The transmission method for dividing multiplexing and polarization multiplexing to combine, its object is to ensure that Large Volume Data has between star ground feeding link
Effect transmission, can be used as the multiple fields such as satellite communication, observing and controlling.
Background technology
It is all logical on star that the characteristics of satellite communication based on ground digital Wave beam forming, is that star ground feeding link needs to transmit
The data in road, data volume are larger.Further, since star ground wireless channel atmospheric environment, electromagnetic environment are complicated, channel distortion can be made,
It is required that the penalty that distortion causes meets index request；Due to cost, the restriction of performance, it is desirable to which On-Star system reduces complicated
Degree；Due to star feed there is a problem of frequency resource be limited, should rationally reduce bandwidth demand.Solve to be based on ground digital wave beam
Effective transmission of the satellite communication system star ground feeding link big data quantity information of formation should consider any of the above factor, root
According to application scenarios, physical condition, optimal selection is made.
Conventional time division multiplex (TDM) transmission system, the signal timesharing of multiple passages feed wireless channel transmission through star.
Either forward link or return link, synchronization only pass the data of a passage.This transmission method has the disadvantage star
On need control device and synchronizer, synchronization accuracy to have high demands, Digital Signal Processing amount is big and complicated.
For code division multiplexing (CDM) transmission system, the signal of different passages carries out band spectrum modulation transmission with different pseudo-codes,
Processed with one group of identical pseudo-code despreading in receiving terminal, recover each channel information.The shortcoming of this method is transmitting terminal needs
Increase spread-spectrum signal processing equipment, meanwhile, receiving terminal needs to increase spread-spectrum signal despreading equipment, and whole communication system signal is processed
Complexity, and there is multi-access inference in CDM, be unfavorable for realizing.
Content of the invention
There is feeding link based on the satellite communication system of ground digital Wave beam forming needs to transmit all port numbers on star
According to challenge, traditional TDM and CDM transmission methods have that Digital Signal Processing is complicated, synchronization accuracy is high, control is complicated asks
Topic, in order to solve this problem, the present invention proposes a kind of satellite communication method.
The present invention is achieved in that a kind of 1. satellite communication methods, and which is used for realizing between satellite and master controller
N number of channel data transmission, each channel data bandwidth is mutually all m MHz, and the satellite is equipped with transmitting terminal on star and satellite
Receiving terminal, the master controller equipped with the M ground station reception end corresponding with transmitting terminal on the star and with the satellite reception
M corresponding earth station's transmitting terminal of end；On the star, transmitting terminal has M transmitting day for being respectively directed to M ground station reception end
Line and M reception antenna of M earth station's transmitting terminal is pointed to, each earth station is also to should transmitting terminal and satellite reception end on star
1 reception antenna of identical and 1 transmitting antenna are set；The satellite communication method is comprised the following steps：
N number of channel data is divided into N/M channel data successively and is respectively allocated to M transmitting antenna；Each transmitting day
N/M channel data on line is equally divided into two groups again successively, the individual channel data of every group of N/ (2M)；Individual for front N/ (2M) port number
According to carrying out after frequency division multiplexing, modulate respectively and arrive center frequency point f1On+i Δs, wherein, f1For initial frequency, i=0,1 ..., N/
(2M) -1, Δ is spaced for side frequency；Individual for rear N/ (2M) channel data is carried out after frequency division multiplexing, center frequency point is arrived in modulation respectively
f1On+Δ/2+i Δs；Two groups of frequency-division multiplex singals of correspondingly same transmitting antenna are carried out after up-conversion radio frequency processing respectively,
Send into corresponding transmitting antenna to be launched；
After each reception antenna receives two groups of transmission signals of corresponding transmitting antenna, it is filtered respectively, amplifies, frequency conversion is penetrated
Frequency is processed；Then the individual channel datas of N/ (2M) are respectively obtained after carrying out solution frequency division multiplexing respectively, altogether N/M channel data.
As the further improvement of such scheme, each channel data frequency interval stick signal isolation bandwidth.
Used as the further improvement of such scheme, the transmitting antenna is dual polarized antenna with the reception antenna, and this is bipolar
It is horizontal polarization signals that change antenna takes the half channel data of corresponding N/M channel data, and second half channel data is vertical pole
Change signal.
Compared with prior art, the invention has the advantages that：
1st, the present invention using frequency division multiplexing transmission means, by by the frequency spectrum shift of different channel signals to non-overlapping copies
Frequency band in realize channeling, compare with TDM with CDM transmission means, it is not necessary at complicated synchronizer, spread spectrum and despreading
Digital signal processing appts, the control devices such as reason etc., reduce the complexity of system；
2nd, in numeric field, the method for frequency division multiplexing of the present invention, can only realize that frequency division is multiple different from TDM and CDM multiplex modes
With both can realizing on numeric field, it is also possible to realize on analog domain；
3rd, the present invention adopts space division+frequency division+polar transmission system so that system bandwidth is greatly reduced, hence it is evident that reduces and is
Demand of the system to frequency spectrum resource.
Description of the drawings
Fig. 1 is the frame diagram of satellite communication method of the present invention；
Fig. 2 is 5 passages frequency division multiplexing figure of the present invention；
Fig. 3 is horizontal polarization of the present invention and vertical polarization schematic diagram；
Fig. 4 is polarization multiplexing schematic diagram of the present invention；
Fig. 5 is the expander graphs of the frame diagram of satellite communication method of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
The satellite communication method of the present invention is used for the transmission for realizing the N number of channel data between satellite and master controller,
Each channel data bandwidth is mutually all m MHz, and the satellite is matched somebody with somebody equipped with transmitting terminal on star and satellite reception end, the master controller
Have the M ground station reception end corresponding with transmitting terminal on the star and the M earth station corresponding with the satellite reception end is sent out
Penetrate end；On the star, transmitting terminal has M transmitting antenna for being respectively directed to M ground station reception end and points to M main the accounting in ground and sends out
Penetrate the M reception antenna at end, each earth station is also to arranging 1 reception day of identical with satellite reception end by transmitting terminal on star
Line and 1 transmitting antenna.
The transmitting antenna is dual polarized antenna with the reception antenna, and the dual polarized antenna takes corresponding N/M channel data
Half channel data be horizontal polarization signals, second half channel data be vertical polarization signal.
The satellite communication method is comprised the following steps.
One：N number of channel data is divided into N/M channel data successively and is respectively allocated to M transmitting antenna；Each is launched
N/M channel data on antenna is equally divided into two groups again successively, the individual channel data of every group of N/ (2M)；Individual for front N/ (2M) passage
After data carry out frequency division multiplexing, center frequency point f is arrived in modulation respectively1On+i Δs, wherein, f1For initial frequency, i=0,1 ..., N/
(2M) -1, Δ for side frequency ask every；Individual for rear N/ (2M) channel data is carried out after frequency division multiplexing, center frequency point is arrived in modulation respectively
f1+ Δ/2+i Δs, on；Two groups of frequency-division multiplex singals of correspondingly same transmitting antenna are carried out up-conversion radio frequency processing respectively
Afterwards, send into corresponding transmitting antenna to be launched.Each channel data frequency interval stick signal isolation bandwidth.
Two：After each reception antenna receives two groups of transmission signals of corresponding transmitting antenna, it is filtered respectively, amplifies, becomes
Frequency radio frequency processing；Then the individual channel datas of N/ (2M) are respectively obtained after carrying out solution frequency division multiplexing respectively, altogether N/M port number
According to.
Detailed illustration is subsequently carried out.
Embodiment 1：
One embodiment of the present of invention is that there are satellite 20 channel datas to need to be transferred to ground, each channel data band
Width is mutually all 6MHz, there are two emitting antennas on star, be respectively directed to earth station 1 and earth station 2, referring to Fig. 1.On star first
First 10 in 20 passages distribute to transmitting antenna 1, distribute to transmitting antenna 2 latter 10；Then, 10 on antenna 1
Individual passage is equally divided into two groups again, per group of 5 passages, and front 5 channel signals are carried out frequency division multiplexing using frequency division multiplexing 1, point
Center frequency point (f Tiao Zhi not arrived1+ i Δs, 0., i=0 1 ..., 4) on, it is considered to the frequency band protection interval between signal, Δ are taken as
10MHz, carries out frequency division multiplexing rear 5 channel signals using frequency division multiplexing 2, in order to increase the isolation of two groups of signals, after
Five passages modulate center frequency point (f respectively1+ Δ/2+i Δs, i=0,1 ..., 4) on, finally two groups of frequency-division multiplex singals
The radio frequency processing such as up-conversion are carried out, horizontal and vertical transmitting dual polarized antenna 1 is then fed into and is launched；10 passages also enter afterwards
The same process of row, is launched in horizontal and vertical transmitting dual polarized antenna 2；The reception dual polarized antenna 1 of earth station 1 is received
The signal of transmitting antenna 1, is filtered, is amplified respectively to horizontal and vertical polarized signal, the radio frequency processing such as frequency conversion, is then carried out
Solution frequency division multiplexing, respectively obtains the signal of 5 passages, altogether the signal of 10 passages；Meanwhile, the reception dual polarization of earth station 2
Antenna 2 receives the signal for launching dual polarized antenna 2 on star, horizontal and vertical polarized signal is filtered respectively, is amplified, frequency conversion
Etc. radio frequency processing, solution frequency division multiplexing is then carried out, respectively obtain the signal of 5 passages, altogether the signal of 10 passages；Finally,
The channel signal of Liang Ge earth stations sends into master controller, and master controller can obtain the signal of 20 passages.
In the system, frequency domain distribution of the signal of 5 passages after frequency division multiplexing 1 is as shown in Fig. 2 each channel center
Frequency is spacedly distributed, and adjacent frequency is spaced 10MHz, and signal bandwidth 6MHz leaves the protection interval of 4MHz.The system is entered to be sent out
The signal spectrum scattergram of two polarised directions of dual polarized antenna 1 is penetrated as shown in figure 3, signal center's frequency of two polarised directions
Point difference 5MHz, can reach more preferable isolation effect.Horizontal and vertical polarized signal is multiplexed using polarizer, as shown in Figure 4.
The frequency resource that the transmission of 20 channel datas of the system takes is 51MHz, the far smaller than total bandwidth of 20 channel datas
120MHz.
When the system adopts frequency division multiplexing, either multi channel signals are combined into all the way in transmitting terminal, or are being received
Signal all the way is reverted to original multiple channel signals, is required for multiple local frequency points to realize multichannel by end solution channeling
Signal spectrum is moved.In order to reduce the impact of Doppler frequency shift, the local frequency on star and ground adopts same benchmark.
With respect to TDM and CDM multiplex modes, Novel Delivery of the present embodiment using spatial reuse+frequency division multiplexing+polarization multiplexing
System, realize simple for structure understand, system structure is simple, the Digital Signal Processing and high-precise synchronization demand for not having complexity, easily
In realization, reliable and stable, it is adaptable to the electric feed signal transmission of star ground.
Embodiment 2：
An alternative embodiment of the invention is feeding link fl transmission, has connecing for 3 sensing Different Ground stations on star
Antenna is received, ground there are 3 earth stations, and ground has 180 channel datas to be needed to be transferred on star, each channel data bandwidth phase
10MHz is all, referring to Fig. 5.Ground master controller is averagely allocated to 3 earth stations, each earth station 180 passages first
The data message for being responsible for 60 passages sends；Earth station 1 is equally divided into two groups again 60 passages, and per group of 30 passages, front
1. 30 channel signals carry out frequency division multiplexing using frequency division multiplexing, and center frequency point (f is arrived in modulation respectively1+ i Δs, i=0,1 ...,
29), on, it is considered to which the frequency band protection interval between signal, Δ are taken as 15MHz, 2. rear 30 channel signals are entered using frequency division multiplexing
Row frequency division multiplexing, in order to increase the isolation of two groups of signals, modulates center frequency point (f respectively rear five passages1+Δ/2+i
Δ, i 20,1 ..., 29) on, two groups of frequency-division multiplex singals are carried out the radio frequency processing such as up-conversion finally, earth station is then fed into
1. 1. horizontal and vertical transmitting dual polarized antenna is launched；Earth station is 2. with earth station 3. respectively to 60 affiliated passages
Data carry out the process 1. same with earth station, and using respective transmitting dual polarized antenna to satellite launch；Satellite reception end
Receive dual polarized antenna 1. receive earth station's signal 1., horizontal and vertical polarized signal is filtered respectively, is amplified,
The radio frequency processing such as frequency conversion, then carry out solution frequency division multiplexing, respectively obtain the signal of 30 passages, altogether the signal of 60 passages；
Meanwhile, 2. the dual polarized antenna that receives at satellite reception end receives earth station's signal 2., to horizontal and vertical polarized signal point
Be not filtered, amplify, the radio frequency processing such as frequency conversion, then carry out solution frequency division multiplexing, respectively obtain the signal of 30 passages, altogether
The signal of 60 passages；Meanwhile, 3. the dual polarized antenna that receives at satellite reception end receives earth station's signal 3., to level and
The radio frequency processing such as vertical polarization signal is filtered respectively, amplifies, frequency conversion, then carry out solution frequency division multiplexing, respectively obtain 30
The signal of passage, the altogether signal of 60 passages；Finally, on star, rear end is obtained the signal of 180 passages.
The relation of frequency division multiplexing schematic diagram and dual polarization frequency division multiplexing in the system, can be by 1 simple deduction of embodiment
Obtain, repeat no more.The use of the frequency resource for transmitting 180 passages occupancy after the present invention program is 452.5MHz, far smaller than
The total bandwidth of 180 passages is 1.8GHz, and needed for this programme, frequency resource is greatly reduced.
When the system adopts frequency division multiplexing, either multi channel signals are combined into all the way in transmitting terminal, or are being received
Signal all the way is reverted to original multiple channel signals, is required for multiple local frequency points to realize multichannel by end solution channeling
Signal spectrum is moved.In order to reduce the impact of Doppler frequency shift, the local frequency on star and ground adopts same benchmark.
With respect to TDM and CDM multiplex modes, Novel Delivery of the present embodiment using space division multiplexing+frequency division multiplexing+polarization multiplexing
System, realize simple for structure understand, system structure is simple, the Digital Signal Processing and high-precise synchronization demand for not having complexity, easily
In realization, reliable and stable, it is adaptable to the electric feed signal transmission of star ground.
The relatively osmanthus embodiment of the present invention is the foregoing is only, not in order to limit the present invention, all in essence of the invention
Any modification, equivalent and improvement that is made within god and principle etc., should be included within the scope of the present invention.
Claims (3)
1. a kind of satellite communication method, which is used for the transmission for realizing the N number of channel data between satellite and master controller, each
Channel data bandwidth is mutually all m MHz, the satellite equipped with transmitting terminal on star and satellite reception end, the master controller equipped with
The M ground station reception end corresponding with transmitting terminal on the star and M earth station's transmitting terminal corresponding with the satellite reception end；
On the star, transmitting terminal has M transmitting antenna for being respectively directed to M ground station reception end and the M for pointing to M earth station's transmitting terminal
Individual reception antenna, each earth station is also to arranging 1 reception antenna of identical and 1 with satellite reception end by transmitting terminal on star
Transmitting antenna；It is characterized in that：The satellite communication method is comprised the following steps：
N number of channel data is divided into N/M channel data successively and is respectively allocated to M transmitting antenna；On each transmitting antenna
N/M channel data be equally divided into two groups again successively, the individual channel data of every group of N/ (2M)；Individual for front N/ (2M) channel data is entered
After row frequency division multiplexing, center frequency point f is arrived in modulation respectively1On+i Δs, wherein, f1For initial frequency, i=0,1 ..., N/ (2M) -1,
Δ is spaced for side frequency；Individual for rear N/ (2M) channel data is carried out after frequency division multiplexing, center frequency point f is arrived in modulation respectively1+Δ/2
+ i Δs, on；Two groups of frequency-division multiplex singals of correspondingly same transmitting antenna are carried out after up-conversion radio frequency processing respectively, phase is sent into
Transmitting antenna is answered to be launched；After each reception antenna receives two groups of transmission signals of corresponding transmitting antenna, be filtered respectively,
Amplify, conversion radio frequency is processed；Then the individual channel datas of N/ (2M) are respectively obtained after carrying out solution frequency division multiplexing respectively, N/M altogether
Channel data.
2. satellite communication method as claimed in claim 1, it is characterised in that：Each channel data frequency interval stick signal every
From bandwidth.
3. satellite communication method as claimed in claim 1, it is characterised in that：The transmitting antenna is bipolar with the reception antenna
Change antenna, the dual polarized antenna take corresponding N/M channel data half channel data be horizontal polarization signals, another hemichannel
Data are vertical polarization signal.
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| CN201610899600.5A CN106506063A (en) | 2016-10-12 | 2016-10-12 | A kind of satellite communication method |
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| CN201610899600.5A CN106506063A (en) | 2016-10-12 | 2016-10-12 | A kind of satellite communication method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964741A (en) * | 2018-06-15 | 2018-12-07 | 上海卫星工程研究所 | A kind of spaceborne X frequency range high-speed digital transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964741A (en) * | 2018-06-15 | 2018-12-07 | 上海卫星工程研究所 | A kind of spaceborne X frequency range high-speed digital transmission system |
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Application publication date: 20170315 |
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| WD01 | Invention patent application deemed withdrawn after publication |