CN104320176B - A kind of satellite communication system and its forward direction Calibration Method - Google Patents
A kind of satellite communication system and its forward direction Calibration Method Download PDFInfo
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- CN104320176B CN104320176B CN201410673650.2A CN201410673650A CN104320176B CN 104320176 B CN104320176 B CN 104320176B CN 201410673650 A CN201410673650 A CN 201410673650A CN 104320176 B CN104320176 B CN 104320176B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
- G01S19/235—Calibration of receiver components
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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
- H04B7/18519—Operations control, administration or maintenance
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Abstract
The invention discloses a kind of satellite communication system and its forward direction Calibration Method.The earth station of the satellite communication system produces multiple mutually orthogonal spread spectrum correction signals, and carried out as each forward path data after frequency division multiplexing by terrestrial transmission to star, the coupling network for the correction signal in each passage being accessed after frequency division multiplexing the satellite Forward receiving antenna back side is solved on star, the superposed signal of output calibration signal, and it is used as a back tunnel data transport to ground, earth station adds the despreading processing of spread spectrum correction signal to obtain forward path time delay, amplitude and phase information through the stack, and then completes preceding to calibration.The present invention need not set multiple calibration stations, reduce the complexity of system maintenance；Spread correction signal to produce on ground, rather than directly produced on star, reduce on-board equipment amount.
Description
Technical field
The present invention relates to the calibration means in the satellite communication of a kind of satellite communication system and the satellite communication system, specifically
It is a kind of satellite communication system and its forward direction Calibration Method.
Background technology
The satellite communication system formed based on terrestrial beam, because satellite fl transmission wave beam is formed on ground, then each
Needed after channel data weighting by forward feeder links by terrestrial transmission to star, the data of multiple forward paths generally pass through
Frequency division multiplexing mode synthesized wideband signal by it is preceding to star feeding link be transferred on star.Satellite reception is to forward feeder links
Broadband signal after, isolate the data of multiple forward paths, and be respectively fed to satellite user section forward emitted passage, and then
Form wave beam.But, due to the influence of forward feeder links wireless channel and microwave components, the width that frequency division multiplexing can be caused to synthesize
Band signal different frequency range undergo different channel fadings, i.e. satellite reception to different passages can undergo different amplitude fadings,
Phase place change and time delay, influence the forward direction wave beam forming properties of user segment.Accordingly, it would be desirable to take certain technological means to improve letter
Number star ground different passages different situation affected by environment in transmitting procedure.Forward direction calibration is referred to before earth station to satellite
Signal transmission into link uses certain calibration means, to correct time delay, amplitude, the phase between different forward path signals
Potential difference value.
The forward direction Calibration Method generally used is to set calibration station on ground, is corrected using calibration station, forward link
Correction signal sent by earth station, by treatment channel, reaching different calibration stations before on star, calibration station is by obtained width
Degree, phase, time delay difference are transmitted to earth station, to the process of calibration before completing.Traditional setting calibration station correction channel signal
Method equipment amount is big, makes system complex, maintenance cost is also high, waste of manpower, material resources.
The content of the invention
Based on the forward direction calibration means that calibration station is set outside traditional battle array, to distance between antenna deformation, feed and antenna
Change, feed is in itself because inter-channel level caused by deformation caused by temperature change etc., phase and delay inequality carry out school
Just, it is as a result more accurate, but cost is high, system complex, and in order to solve this problem, the present invention proposes a kind of satellite communication system
Forward direction Calibration Method in system and its satellite communication.
The present invention is achieved in that a kind of satellite communication system, it include at least one earth station and with the ground
The satellite stood using satellite communication：The earth station includes the first frequency division multiplexer, ground launch antenna, terrestrial receiving antenna, the
One solution frequency division multiplexer, channel correcting device, spread-spectrum signal generator, despreading processor；The satellite includes reception antenna, star on star
To on back processor on processor, the second solution frequency division multiplexer, Forward receiving antenna, the second frequency division multiplexer, star, star before upper
Transmitting antenna, coupling network, filtering frequency converter；
The spread-spectrum signal generator is used for the N number of mutually orthogonal spread spectrum of Form generation for making correction signal use spread-spectrum signal
Correction signal；First frequency division multiplexer, which is used to N number of spread spectrum correction signal be modulated to respectively in N number of forward data passage, to be carried out
Frequency division multiplexing；The ground launch antenna is used to regard the signal after the first frequency division multiplexer frequency division multiplexing as the earth station
Transmission signal is sent to the satellite；
Reception antenna is used for the transmission signal for receiving the earth station on the star；It is used for before on the star to processor to the ground
The transmission signal stood carries out preceding to processing；The second solution frequency division multiplexer is used to answer carrying out solution frequency division through the preceding signal to processing
With isolating N number of correction signal, and N number of correction signal sent into the coupling at the radiating surface back side of the Forward receiving antenna of satellite
Network；The coupling network is connected with each forward emitted passage of the Forward receiving antenna, the N number of correction letter of coupling network output
Number superposed signal；The filtering frequency converter is filtered to superposed signal and is converted in the signal of back receiving channel of satellite
Heart frequency；Second frequency division multiplexer is used to assign the superposition correction signal after frequency conversion as an individual passage and satellite
Back receiving channel data carry out frequency division multiplexing；On the star back processor be used for the signal after frequency division multiplexing is filtered,
Amplification, frequency-conversion processing are as the transmission signal of the satellite, and the transmission signal of the satellite transmitted to this by transmitting antenna on the star
Earth station；
The terrestrial receiving antenna is used to receive the transmission signal from the satellite；The first solution frequency division multiplexer is used for should
The transmission signal solution frequency division multiplexing of satellite obtains superposition correction signal；The despreading processor uses the N number of mutual of transmitting terminal generation
Orthogonal spread spectrum correction signal carries out despreading processing, so obtain the amplitude fading of each forward path, phase place change and
Delay；The channel correcting device is used on the basis of the amplitude fading of first forward path, phase place change and Delay,
Amplitude, phase and time delay to other forward path data are corrected.
As the further improvement of such scheme, second frequency division multiplexer, which is used to the superposition after frequency conversion correct, to be believed
Number frequency division multiplexing is carried out as an individual passage and the back receiving channel data of satellite, in back receiving channel signal
Frequency of heart maximum modulation is to fh, superposition correction signal is modulated to center frequency point fh+ Δ, wherein Δ are that data channel is believed with correction
Number frequency interval.
The present invention also provides the forward direction Calibration Method in a kind of satellite communication, and it is applied in above-mentioned satellite communication system,
Section is fed using different passages during frequency division multiplexing mode channel signal for compensating forward direction between satellite and earth station
The different distortions affected by environment caused, wherein：Forward direction Calibration Method in the satellite communication comprises the following steps：
The first step, earth station：N number of mutually orthogonal spread spectrum correction signal is produced, and N number of correction signal is modulated to respectively
Frequency division multiplexing is carried out in N number of forward data passage, the signal after frequency division multiplexing is carried out radio frequency processing and sent out using antenna by earth station
It is shot out；
Second step, satellite：Receive the signal of the earth station, be filtered, amplify, down coversion, solution frequency division multiplexing, separation
Go out N number of correction signal, and N number of correction signal sent into the coupling network at the Forward receiving aerial radiation face back side；The catenet
Network is connected with each forward emitted passage, and the coupling network exports the superposed signal of N number of correction signal；Superposed signal is filtered
Ripple and the signal center's frequency for being converted to satellite back receiving channel；It assign the superposition correction signal after frequency conversion as a list
The back receiving channel data of only passage and satellite carry out frequency division multiplexing；Signal after frequency division multiplexing is filtered, amplify, become
Frequency handle, by star back feeding link transmit to earth station；
3rd step, returns to ground：Superposition correction signal is obtained to the signal progress solution frequency division multiplexing of reception, and uses transmission
N number of mutually orthogonal spread spectrum correction signal that end is produced carries out despreading processing, and then obtains the amplitude of each forward path
Decay, phase place change and Delay, earth station using the amplitude fading of first forward path, phase place change and Delay as
Benchmark, amplitude, phase and time delay to other forward path data are corrected.
As the further improvement of such scheme, using the superposition correction signal after frequency conversion as an individual passage with
The back receiving channel data of satellite carry out frequency division multiplexing：The centre frequency maximum modulation of back receiving channel signal to fh,
Superposition correction signal is modulated to center frequency point fh+ Δ, wherein Δ are the frequency interval of data channel and correction signal.
Compared with prior art, the invention has the advantages that：
1st, the forward direction Calibration Method that the present invention is used on ground without setting multiple calibration stations, it is possible to reduce builds and safeguards
A series of problems that calibration station is brought；
2nd, in battle array of the present invention forward direction calibration design so that coupling network is a part for On-Star system in itself, is dropped significantly
The space of low whole system and equipment amount, while also reducing complexity.
Brief description of the drawings
Fig. 1 is the structural representation for the satellite communication system that the embodiment of the present invention 1 is provided, and is that the present invention is preceding to calibration side
The schematic diagram of method.
Fig. 2 is 10 calibration signal forward path frequency division multiplexing figures of Tu1Zhong earth stations.
Fig. 3 is 10 superposition calibration signal schematic representations of coupling network output on Fig. 1 culminant stars.
Fig. 4 is signal frequency domain schematic diagram after Fig. 1 culminant star upper channel frequency division multiplexings.
Fig. 5 is the structural representation for the satellite communication system that the embodiment of the present invention 2 is provided, i.e., ground multistation of the present invention
To the system framework figure of Calibration Method before joint.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment 1：
Fig. 1, Fig. 2, Fig. 3 and Fig. 4 are referred in the lump, describe one embodiment of satellite communication system of the present invention, star communication
System includes at least one earth station 1 and the satellite 2 of satellite communication is used with the earth station 1.Ground has one in the present embodiment
Individual earth station 1, the data that there are 10 forward paths in earth station 1 need to be transferred on star i.e. satellite 2, the data bandwidth of each passage
For 7MHz, the data of 10 passages are transmitted by the way of frequency division multiplexing, it is considered to the isolation of each passage, are carried out frequency division and are answered
Used time, the interval of each adjacent frequency was taken as 10MHz.
Earth station 1 includes spread-spectrum signal generator 12, the first frequency division multiplexer 13, ground launch antenna 14, ground receiver
The solution of antenna 15, first frequency division multiplexer 16, channel correcting device 17, despreading processor 18.The satellite include star on reception antenna 22,
Before on star frequency division multiplexer 24, Forward receiving antenna 25, coupling network 26, the second frequency division multiplexer are solved to processor 23, second
27th, back processor 28 on star, transmitting antenna 29, filtering frequency converter 30 on star.
The spread-spectrum signal generator 12 is used for the N number of mutually orthogonal expansion of Form generation for making correction signal use spread-spectrum signal
Frequency correction signal；First frequency division multiplexer 13 is used to N number of spread spectrum correction signal be modulated to respectively in N number of forward data passage
Carry out frequency division multiplexing；The ground launch antenna 14 is used to regard the signal after the frequency division multiplexing of the first frequency division multiplexer 13 as this
The transmission signal of earth station 1 is sent to the satellite 2.
Reception antenna 22 is used for the transmission signal for receiving the earth station 1 on the star；On the star before to processor 23 be used for pair
The transmission signal of the earth station 1 carries out preceding to processing；The second solution frequency division multiplexer 24 is used for entering before to the signal of processing
Row solution frequency division multiplexing isolates N number of correction signal, and the spoke of the Forward receiving antenna 25 N number of correction signal feeding satellite 2
Penetrate the coupling network 26 at the face back side；The coupling network 26 is connected with each forward emitted passage of the Forward receiving antenna 25, should
Coupling network 26 exports the superposed signal of N number of correction signal；The filtering frequency converter 30 is filtered and is converted to superposed signal
Signal center's frequency of the back receiving channel of satellite 2；Second frequency division multiplexer 27 is used for the superposition school after frequency conversion
Positive signal carries out frequency division multiplexing as an individual passage and the back receiving channel data of satellite 2；Back processor on the star
28 be used for the signal after frequency division multiplexing is filtered, amplified, frequency-conversion processing as the satellite 2 transmission signal, the satellite 2
Transmission signal is transmitted to the earth station 1 by transmitting antenna 29 on the star.
The terrestrial receiving antenna 15 is used to receive the transmission signal from the satellite 2；The first solution frequency division multiplexer 16 is used
Correction signal is superimposed in the transmission signal solution frequency division multiplexing of the satellite 2 is obtained；The despreading processor 18 is produced using transmitting terminal
N number of mutually orthogonal spread spectrum correction signal carry out despreading processing, and then obtain the amplitude fading of each forward path, phase
Position change and Delay；The channel correcting device 17 is used for the amplitude fading of first forward path, phase place change and time delay
On the basis of information, amplitude, phase and time delay to other forward path data are corrected.
Earth station 1 produces the mutually orthogonal spread spectrum correction signal of 10 7MHz bandwidth, is used as the signal of 10 forward paths
Carried out before frequency division multiplexing, 1 pair of earth station to correction signal using the first frequency division multiplexer 13 frequency of signal A after frequency division multiplexing
Domain signal hint is shown in diagram 2；Earth station 1 is launched signal A using ground launch antenna 14.
Satellite 2 receives the signal of ground launch antenna 14 using reception antenna 22 on star, using preceding to processor 23 on star
Signal is filtered, amplified, the processing such as frequency conversion, then solve frequency division multiplexer 24 using second solution frequency division carried out to signal and answer
With, 10 spread spectrum correction signals are obtained, and the radiating surface of Forward receiving antenna 25 back of the body of 10 spread spectrum correction signal feeding satellites 2
The coupling network 26 in face；Coupling network 26 is connected with each forward emitted passage, and coupling network 26 exports 10 spread spectrum correction letters
Number superposed signal, superposition correction signal frequency domain schematic diagram see diagram 3；2 pairs of superposition correction signals of satellite are filtered and become
Frequency is to signal center's frequency of the back receiving channel of satellite 2, and satellite 2 assign the superposition correction signal after frequency conversion as one
Individual passage and 10 back receiving channel data of satellite carry out the frequency domain signal of the signal B after frequency division multiplexing, frequency division multiplexing
Figure is shown in diagram 4, then signal B is filtered using back processor 28 on star, amplified, frequency-conversion processing, and is sent out using on star
Antenna 29 is penetrated to launch.
Earth station 1 receives the signal of transmitting antenna 29 on star using terrestrial receiving antenna 15, and is answered using the first solution frequency division
Solution frequency division multiplexing is carried out with device 16 and obtains 10 back channel signals and superposition correction signal, 1 pair of superposition correction signal of earth station
Despreading processing, which are carried out, using 10 spreading codes, and enter line amplitude, phase and time delay with 10 spread spectrum correction signals of transmission comparing,
And then amplitude fading, phase place change and the Delay of 10 forward paths are obtained, earth station 1 is with the width of first forward path
On the basis of degree decay, phase place change and Delay, amplitude, phase and time delay to other channel datas are corrected, and are completed
Forward direction calibration works.
In the present invention, forward direction correction signal uses mutually orthogonal multiple spread-spectrum signals, and one is superimposed upon after being coupled on star
Rise and ground is passed back by return link, because spread-spectrum signal has orthogonality, then superposition can't be influenceed at the despreading of earth station 1
Reason.In addition, forward direction correction signal is to be transmitted into by what earth station 1 produced on star in the present invention, then have coupled on star after through back
Link passes earth station 1 back, it is to avoid the problem of traditional Calibration Method needs calibration station, so as to simplify system design, just with it is rear
Phase safeguards.
Embodiment 2：
An alternative embodiment of the invention is the scene using distributed earth station, refers to Fig. 5, two ground of surface deployment
Mian Zhanji earth stations 1 and earth station 24, system forward have 80 channel datas to need by terrestrial transmission to star i.e. satellite 5.
Back has 40 channel datas to need to be transferred to ground on star, and each forward path data and back channel data bandwidth are
7MHz.It is reception antenna 2 52 on reception antenna 1 and star on star that two directional receiving antennas are configured on star, is respectively directed to ground
Face station 1 and earth station 24.
40 forward path data are transmitted to reception antenna on star 1 in earth station 1, and the data of 40 passages are using frequency
The mode of multiplexing is divided to be transmitted, it is considered to the isolation of each passage, the interval of each adjacent frequency is taken as when carrying out frequency division multiplexing
10MHz.Other 40 forward path data are transmitted to reception antenna on star 2 52 in earth station 24, and the data of 40 passages are used
The mode of frequency division multiplexing is transmitted, it is considered to the isolation of each passage, and the interval of each adjacent frequency takes when carrying out frequency division multiplexing
For 10MHz.
Earth station 24 produces the spread spectrum correction signal of 80 mutually orthogonal 7MHz bandwidth, 40 feedings ground therein
Stand 1, be used as the signal of 40 forward paths to carry out frequency division multiplexing.Before one 3 pairs of earth station the first frequency division is used to correction signal
Multiplexer 1 is launched after carrying out frequency division multiplexing using ground launch antenna 1；Earth station 24 is other 40 spread spectrums
Correction signal is launched after carrying out frequency division multiplexing using the second frequency division multiplexer 2 32 using ground launch antenna 2 34.
Satellite 2 receives the signal of ground launch antenna 1 using reception antenna 1 on star, using preceding to processing on star
The processing such as one 53 pairs of signals of device are filtered, amplified, frequency conversion, are then solved using second solution one 55 pairs of signals of frequency division multiplexer
Frequency division multiplexing, obtains 40 spread spectrum correction signals.Satellite 2 receives ground launch antenna 2 34 using reception antenna 2 52 on star
Signal, using being filtered to 2 54 pairs of signals of processor before on star, amplify, the processing such as frequency conversion, then solve frequency division using second
2 56 pairs of signals of multiplexer carry out solution frequency division multiplexing, obtain other 40 spread spectrums correction signal, and 80 spread spectrum corrections are obtained altogether
Signal.
Coupling of the satellite 2 the radiating surface back side of Forward receiving antenna 25 of 80 spread spectrum correction signal feeding satellites 2 of acquisition
Network 26 is closed, coupling network 26 is connected with each forward emitted passage, coupling network 26 exports 80 and spreads the folded of correction signal
Plus signal.2 pairs of superposition correction signals of satellite are filtered using filtering frequency converter 30 and are converted to the back receiving channel of satellite 2
Signal center's frequency, satellite 2 returns using the superposition correction signal after frequency conversion as 40 of an individual passage and satellite
Frequency division multiplexing is carried out using the second frequency division multiplexer 27 to receiving channel data, is then filtered using back processor 28 on star
Ripple, amplification, frequency-conversion processing, and launched using transmitting antenna on star 29.
Earth station 24 receives the signal of transmitting antenna 29 on star using terrestrial receiving antenna 15, and solves frequency division using first
Multiplexer 16 carries out solution frequency division multiplexing and obtains 40 back channel signals and superposition correction signal.24 pairs of superposition corrections of earth station
Signal carries out despreading processing using 80 spreading codes, and enters line amplitude, phase and time delay with 80 spread spectrum correction signals of transmission
Compare, and then obtain amplitude fading, phase place change and the Delay of 80 forward paths, earth station is with first forward path
Amplitude fading, phase place change and Delay on the basis of, amplitude, phase and time delay to other channel datas are corrected,
Worked before completing to calibration.
The present embodiment surface deployment Liang Ge earth stations, are each responsible for the transmission of part forward path signals, are of the invention
Simple extension.
In the present invention, forward direction correction signal uses mutually orthogonal multiple spread-spectrum signals, and one is superimposed upon after being coupled on star
Rise and ground is passed back by return link, because spread-spectrum signal has orthogonality, then superposition can't be influenceed at the despreading of earth station
Reason.In addition, forward direction calibration signal is to be transmitted into by what earth station produced on star in the present invention, then have coupled on star after through back chain
Pass ground back in road, it is to avoid the problem of traditional Calibration Method needs calibration station, so as to simplify system design, just tieed up with the later stage
Shield.
In summary, earth station of the present invention produces multiple mutually orthogonal spread spectrum correction signals, and logical as each forward direction
Track data is carried out after frequency division multiplexing by terrestrial transmission to star, and the correction signal in each passage is connect after solving frequency division multiplexing on star
Enter the coupling network at the satellite Forward receiving antenna back side, the superposed signal of output calibration signal, and be used as a back port number
According to ground is transferred to, earth station adds the despreading processing of spread spectrum correction signal to obtain forward path time delay, amplitude and phase through the stack
Position information, and then complete preceding to calibration.The present invention need not set multiple calibration stations, reduce the complexity of system maintenance；Spread spectrum
Correction signal is produced on ground, rather than directly produced on star, reduces on-board equipment amount.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (4)
1. a kind of satellite communication system, it includes at least one earth station and the satellite of satellite communication is used with the earth station：
Wherein, the earth station solves frequency division multiplexer including the first frequency division multiplexer, ground launch antenna, terrestrial receiving antenna, first, led to
Channel correction device；The satellite includes reception antenna on star, on star before to processor, the second solution frequency division multiplexer, Forward receiving antenna,
Back processor on second frequency division multiplexer, star, transmitting antenna on star；It is characterized in that：The earth station also includes spread-spectrum signal
Generator, despreading processor；The satellite also includes coupling network, filtering frequency converter；
The spread-spectrum signal generator is used for the N number of mutually orthogonal spread spectrum correction of Form generation for making correction signal using spread-spectrum signal
Signal；First frequency division multiplexer, which is used to N number of spread spectrum correction signal be modulated to respectively in N number of forward data passage, carries out frequency division
Multiplexing；The ground launch antenna be used for using the signal after the first frequency division multiplexer frequency division multiplexing as the earth station transmitting
Signal is sent to the satellite；
Reception antenna is used for the transmission signal for receiving the earth station on the star；It is used for before on the star to processor to the earth station
Transmission signal carries out preceding to processing；The second solution frequency division multiplexer is used for carrying out solution frequency division multiplexing point through the preceding signal to processing
Separate out and isolate N number of correction signal, and N number of correction signal send into satellite the Forward receiving antenna the radiating surface back side coupling
Close network；The coupling network is connected with each forward emitted passage of the Forward receiving antenna, and the coupling network exports N number of correction
The superposed signal of signal；The filtering frequency converter is filtered and is converted to the signal of the back receiving channel of satellite to superposed signal
Center frequency point；Second frequency division multiplexer is used to assign the superposition correction signal after frequency conversion as an individual passage and satellite
Back receiving channel data carry out frequency division multiplexing；Back processor is used to the signal after frequency division multiplexing be filtered on the star
Ripple, amplification, frequency-conversion processing as the satellite transmission signal, the transmission signal of the satellite by transmitting antenna on the star transmit to
The earth station；
The terrestrial receiving antenna is used to receive the transmission signal from the satellite；The first solution frequency division multiplexer is used for the satellite
Transmission signal solution frequency division multiplexing obtain superposition correction signal；The despreading processor is N number of mutually orthogonal using transmitting terminal generation
Spread spectrum correction signal carry out despreading processing, and then obtain amplitude fading, phase place change and the time delay of each forward path
Information；The channel correcting device is used on the basis of the amplitude fading of first forward path, phase place change and Delay, to it
Amplitude, phase and the time delay of his forward path data are corrected.
2. satellite communication system as claimed in claim 1, it is characterised in that：Second frequency division multiplexer is used for handle and passes through frequency conversion
Superposition correction signal afterwards carries out frequency division multiplexing as an individual passage and the back receiving channel data of satellite, and back is connect
The centre frequency maximum modulation of channel signal is received to fh, superposition correction signal is modulated to center frequency point fh+ Δ, wherein Δ are number
According to passage and the frequency interval of correction signal.
3. the forward direction Calibration Method in a kind of satellite communication, it is applied in satellite communication system as claimed in claim 1, is used
In compensation satellite and earth station between forward direction feed section use frequency division multiplexing mode channel signal during different passages by
The different distortions that ambient influnence is caused, it is characterised in that：Forward direction Calibration Method in the satellite communication comprises the following steps：
The first step, earth station：N number of mutually orthogonal spread spectrum correction signal is produced, and N number of correction signal is modulated to respectively N number of
Frequency division multiplexing is carried out in forward data passage, the signal after frequency division multiplexing is carried out radio frequency processing and launched using antenna by earth station
Go；
Second step, satellite：Receive the signal of the earth station, be filtered, amplify, down coversion, solution frequency division multiplexing, isolate N
Individual correction signal, and N number of correction signal sent into the coupling network at the Forward receiving aerial radiation face back side；The coupling network with
Each forward emitted passage is connected, and the coupling network exports the superposed signal of N number of correction signal；Superposed signal is filtered simultaneously
It is converted to signal center's frequency of satellite back receiving channel；It is individually logical using the superposition correction signal after frequency conversion as one
The back receiving channel data of road and satellite carry out frequency division multiplexing；Signal after frequency division multiplexing is filtered, amplified, at frequency conversion
Reason, by star back feeding link transmit to earth station；
3rd step, returns to ground：Solution frequency division multiplexing acquisition superposition correction signal is carried out to the signal of reception, and produced using transmitting terminal
Raw N number of mutually orthogonal spread spectrum correction signal carries out despreading processing, so obtain each forward path amplitude fading,
Phase place change and Delay, earth station on the basis of the amplitude fading of first forward path, phase place change and Delay,
Amplitude, phase and time delay to other forward path data are corrected.
4. the forward direction Calibration Method in satellite communication as claimed in claim 3, it is characterised in that：The superposition after frequency conversion
Correction signal carries out frequency division multiplexing as an individual passage and the back receiving channel data of satellite：Back receiving channel letter
Number centre frequency maximum modulation to fh, superposition correction signal is modulated to center frequency point fh+ Δ, wherein Δ be data channel with
The frequency interval of correction signal.
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| US10355774B2 (en) | 2015-04-10 | 2019-07-16 | Viasat, Inc. | End-to-end beamforming system |
| CN105915264B (en) * | 2016-05-20 | 2018-05-22 | 中国电子科技集团公司第十研究所 | The method of the double spread-spectrum code signals of multiplexing SMA links |
| CN108683447B (en) * | 2018-04-09 | 2021-02-19 | 中国电子科技集团公司第三十八研究所 | Method and system for eliminating Doppler frequency difference of forward feed link in satellite communication |
| CN113093190B (en) * | 2021-04-08 | 2023-06-16 | 中国电子科技集团公司第三十八研究所 | Airborne stripe SAR image positioning method based on high-precision combined inertial navigation system |
| CN113726461B (en) * | 2021-07-30 | 2023-06-06 | 中国电子科技集团公司第三十八研究所 | Ka frequency band broadband link modeling simulation system |
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