CN104320176A - Satellite communication system and forward calibration method thereof - Google Patents
Satellite communication system and forward calibration method thereof Download PDFInfo
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- CN104320176A CN104320176A CN201410673650.2A CN201410673650A CN104320176A CN 104320176 A CN104320176 A CN 104320176A CN 201410673650 A CN201410673650 A CN 201410673650A CN 104320176 A CN104320176 A CN 104320176A
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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
Abstract
The invention discloses a satellite communication system and a forward calibration method of the satellite communication system. According to the satellite communication system, a plurality of mutually orthogonal spread spectrum correction signals are generated on a ground station, and are transmitted to a satellite after being subjected to frequency division multiplexing as data of each forward channel. The correction signals in each channel are accessed to a coupling network on the back face of a forward transmitting antenna of the satellite after being subjected to frequency division multiplexing on the satellite, superposed signals of the correction signals are output and transmitted to the ground as backward channel data. The ground station carries out dispreading processing on the superposed spread spectrum correction signals to obtain time delay information, amplitude information and phase information of the forward channels, and therefore backward calibration is completed. According to the satellite communication system and the forward calibration method of the satellite communication system, multiple calibration stations are not needed, and therefore the complexity of system maintenance is reduced; the spread spectrum correction signals are generated on the ground instead of being directly generated on the satellite, and therefore the amount of equipment on the satellite is reduced.
Description
Technical field
The present invention relates to the calibration means in the satellite communication of a kind of satellite communication system and this satellite communication system, specifically a kind of satellite communication system and forward direction Calibration Method thereof.
Background technology
Based on the satellite communication system that terrestrial beam is formed, because satellite fl transmission wave beam is formed on ground, then to need by forward feeder links by terrestrial transmission on star after each channel data weighting, the data of multiple forward path are transferred on star by forward direction star ground feeding link by frequency division multiplexing mode synthesized wideband signal usually.After satellite reception to the broadband signal of forward feeder links, isolate the data of multiple forward path, and send into the forward emitted passage of satellite user section respectively, and then form wave beam.But, due to the impact of forward feeder links wireless channel and microwave components, the broadband signal different frequency range that frequency division multiplexing can be caused to synthesize experiences different channel fadings, namely satellite reception to different passages can experience different amplitude fadings, phase place change and time delay, affect the forward direction wave beam forming property of user segment.Therefore, need to take certain technological means to improve different passage different situation affected by environment in signal star ground transmitting procedure.Forward direction calibration refers to and adopts certain calibration means to ground station to the Signal transmissions in the forward link of satellite, to revise time delay, amplitude, the phase difference value between different forward path signals.
The forward direction Calibration Method of usual employing arranges calibration station on ground, calibration station is utilized to correct, the correction signal of forward link is sent by ground station, forward direction treatment channel on star, arrive different calibration stations, the amplitude obtained, phase place, time delay difference are passed to ground station by calibration station, complete the process of forward direction calibration.Traditional method equipment amount arranging calibration station correction channel signal is large, and make system complex, maintenance cost is also high, waste of manpower, material resources.
Summary of the invention
Based on the forward direction calibration means arranging calibration station outside traditional battle array, inter-channel level, phase place and delay inequality that the deformation etc. that spacing changes, feed itself causes due to variations in temperature of antenna deformation, feed and antenna causes are corrected, result is comparatively accurate, but cost is high, system complex, in order to address this problem, the present invention proposes the forward direction Calibration Method in a kind of satellite communication system and satellite communication thereof.
The present invention realizes like this, a kind of satellite communication system, it comprises at least one ground station and adopts the satellite of satellite communication with this ground station: this ground station comprises the first frequency division multiplexer, ground launch antenna, terrestrial receiving antenna, first separate frequency division multiplexer, channel correcting device, spread-spectrum signal generator, despreading processor; This satellite comprises forward direction processor on reception antenna on star, star, second and separates frequency division multiplexer, Forward receiving antenna, the second frequency division multiplexer, transmitting antenna, coupling network, filtering frequency converter on back processor, star on star;
The Form generation N number of mutually orthogonal spread spectrum correction signal of this spread-spectrum signal generator for making correction signal adopt spread-spectrum signal; This first frequency division multiplexer is used for N number of spread spectrum correction signal to be modulated to respectively in N number of forward data passage to carry out frequency division multiplexing; This ground launch antenna is used for the signal after this first frequency division multiplexer frequency division multiplexing to be sent to this satellite as transmitting of this ground station;
On this star, reception antenna is for receiving transmitting of this ground station; On this star, forward direction processor is used for carrying out forward direction process to transmitting of this ground station; This second solution frequency division multiplexer is used for carrying out solution frequency division multiplexing to the signal through forward direction process and isolates N number of correction signal, and N number of correction signal is sent into the coupling network at the radiating surface back side of this forward emitted antenna of satellite; This coupling network is connected with each forward emitted passage of this forward emitted antenna, and this coupling network exports the superposed signal of N number of correction signal; This filtering frequency converter carries out filtering to superposed signal and is converted to signal center's frequency of the back receive path of satellite; This second frequency division multiplexer is used for the superposition correction signal after frequency conversion to carry out frequency division multiplexing as the back receive path data of an individual passage and satellite; On this star, back processor is used for the signal after frequency division multiplexing to carry out filtering, amplification, frequency-conversion processing transmitting as this satellite, and transmitting of this satellite transfers to this ground station by transmitting antenna on this star;
This terrestrial receiving antenna is for receiving transmitting from this satellite; This first solution frequency division multiplexer is used for transmitting of this satellite to separate frequency division multiplexing acquisition superposition correction signal; The N number of mutually orthogonal spread spectrum correction signal that this despreading processor uses transmitting terminal to produce carries out despreading process, so obtain the amplitude fading of each forward path, phase place changes and Delay; This channel correcting device to be used for the amplitude fading of first forward path, phase place change and Delay, for benchmark, correcting the amplitude of other forward path data, phase place and time delay.
As the further improvement of such scheme, this second frequency division multiplexer is used for the superposition correction signal after frequency conversion to carry out frequency division multiplexing, the centre frequency maximum modulation of back receive path signal to f as the back receive path data of an individual passage and satellite
h, superposition correction signal is modulated to center frequency point f
h+ Δ, wherein Δ is the frequency interval of data channel and correction signal.
The present invention also provides the Calibration Method of the back in a kind of satellite communication, it is applied in above-mentioned satellite communication system, the different passage different distortions caused affected by environment in frequency division multiplexing mode channel signal process are adopted for compensating forward direction feed section between satellite from ground station, wherein: the forward direction Calibration Method in this satellite communication comprises the following steps:
The first step, ground station: produce N number of mutually orthogonal spread spectrum correction signal, and N number of correction signal is modulated in N number of forward data passage respectively carries out frequency division multiplexing, ground station carries out radio frequency processing the signal after frequency division multiplexing and uses antenna transmission to go out;
Second step, satellite: the signal receiving this ground station, carries out filtering, amplification, down-conversion, solution frequency division multiplexing, isolates N number of correction signal, and N number of correction signal is sent into the coupling network at this back side, forward emitted aerial radiation face; This coupling network is connected with each forward emitted passage, and this coupling network exports the superposed signal of N number of correction signal; Filtering is carried out to superposed signal and is converted to signal center's frequency of satellite back receive path; Superposition correction signal after frequency conversion is carried out frequency division multiplexing as the back receive path data of an individual passage and satellite; Signal after frequency division multiplexing is carried out filtering, amplification, frequency-conversion processing, transfers to ground station by star ground back feeding link;
3rd step, return to ground: solution frequency division multiplexing is carried out to the signal received and obtains superposition correction signal, and the N number of mutually orthogonal spread spectrum correction signal using transmitting terminal to produce carries out despreading process, and then obtain each forward path amplitude fading, phase place change and Delay, ground station, corrects the amplitude of other forward path data, phase place and time delay for benchmark with the amplitude fading of first forward path, phase place change and Delay.
As the further improvement of such scheme, the superposition correction signal after frequency conversion is carried out frequency division multiplexing as the back receive path data of an individual passage and satellite: the centre frequency maximum modulation of back receive path signal to f
h, superposition correction signal is modulated to center frequency point f
h+ Δ, wherein Δ is the frequency interval of data channel and correction signal.
Compared with prior art, tool of the present invention has the following advantages:
1, the forward direction Calibration Method of the present invention's employing is without the need to arranging multiple calibration station on ground, can reduce and builds and safeguard the series of problems that calibration station is brought;
2, the design of forward direction calibration in battle array of the present invention, makes coupling network itself be the part of On-Star system, greatly reduces space and the equipment amount of whole system, also reduce complexity simultaneously.
Accompanying drawing explanation
The structural representation of the satellite communication system that Fig. 1 provides for the embodiment of the present invention 1, is the schematic diagram of forward direction Calibration Method of the present invention.
Fig. 2 is Tu1Zhong ground station 10 calibration signal forward path frequency division multiplexing figure.
Fig. 3 is 10 superposition calibration signal schematic representations that on Fig. 1 culminant star, coupling network exports.
Fig. 4 is signal frequency domain schematic diagram after Fig. 1 culminant star upper channel frequency division multiplexing.
The structural representation of the satellite communication system that Fig. 5 provides for the embodiment of the present invention 2, i.e. the system framework figure of ground of the present invention multistation associating forward direction Calibration Method.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment 1:
Consult Fig. 1, Fig. 2, Fig. 3 and Fig. 4 in the lump, describe first embodiment of satellite communication system of the present invention, star communication system comprises at least one ground station 1 and adopts the satellite 2 of satellite communication with this ground station 1.In the present embodiment, there is a ground station 1 on ground, it is satellite 2 that ground station 1 has the data of 10 forward paths to need to be transferred on star, the data bandwidth of each passage is 7MHz, the mode of the data acquisition frequency division multiplexing of 10 passages is transmitted, consider the isolation of each passage, the interval of carrying out each adjacent frequency during frequency division multiplexing is taken as 10MHz.
Ground station 1 comprises spread-spectrum signal generator 12, first frequency division multiplexer 13, ground launch antenna 14, terrestrial receiving antenna 15, first solution frequency division multiplexer 16, channel correcting device 17, despreading processor 18.This satellite to comprise on star forward direction processor 23, second on reception antenna 22, star and to separate on frequency division multiplexer 24, Forward receiving antenna 25, coupling network 26, second frequency division multiplexer 27, star transmitting antenna 29, filtering frequency converter 30 on back processor 28, star.
The Form generation N number of mutually orthogonal spread spectrum correction signal of this spread-spectrum signal generator 12 for making correction signal adopt spread-spectrum signal; This first frequency division multiplexer 13 carries out frequency division multiplexing for N number of spread spectrum correction signal is modulated in N number of forward data passage respectively; This ground launch antenna 14 is for being sent to this satellite 2 using the signal after this first frequency division multiplexer 13 frequency division multiplexing as transmitting of this ground station 1.
On this star, reception antenna 22 is for receiving transmitting of this ground station 1; On this star, forward direction processor 23 is for carrying out forward direction process to transmitting of this ground station 1; This second solution frequency division multiplexer 24 isolates N number of correction signal for carrying out solution frequency division multiplexing to the signal through forward direction process, and N number of correction signal is sent into the coupling network 26 at the radiating surface back side of this forward emitted antenna 25 of satellite 2; This coupling network 26 is connected with each forward emitted passage of this forward emitted antenna 25, and this coupling network 26 exports the superposed signal of N number of correction signal; This filtering frequency converter 30 pairs of superposed signals are carried out filtering and are converted to signal center's frequency of the back receive path of satellite 2; This second frequency division multiplexer 27 is for carrying out frequency division multiplexing using the superposition correction signal after frequency conversion as the back receive path data of an individual passage and satellite 2; On this star back processor 28 for the signal after frequency division multiplexing being carried out filtering, amplification, frequency-conversion processing transmit as this satellite 2, transmitting of this satellite 2 transfers to this ground station 1 by transmitting antenna on this star 29.
This terrestrial receiving antenna 15 is for receiving transmitting from this satellite 2; This first solution frequency division multiplexer 16 is for separating frequency division multiplexing acquisition superposition correction signal by transmitting of this satellite 2; The N number of mutually orthogonal spread spectrum correction signal that this despreading processor 18 uses transmitting terminal to produce carries out despreading process, so obtain each forward path amplitude fading, phase place change and Delay; This channel correcting device 17 for the amplitude fading of first forward path, phase place change and Delay for benchmark, the amplitude of other forward path data, phase place and time delay are corrected.
Ground station 1 produces the mutually orthogonal spread spectrum correction signal of 10 7MHz bandwidth, signal as 10 forward paths carries out frequency division multiplexing, and after ground station's 1 pair of forward direction correction signal uses the first frequency division multiplexer 13 to carry out frequency division multiplexing, diagram 2 is shown in the frequency-region signal signal of signal A; Ground station 1 uses ground launch antenna 14 to launch signal A.
Satellite 2 uses reception antenna 22 on star to receive the signal of ground launch antenna 14, forward direction processor 23 pairs of signals on star are used to carry out the process such as filtering, amplification, frequency conversion, then use second to separate frequency division multiplexer 24 pairs of signals and carry out solution frequency division multiplexing, obtain 10 spread spectrum correction signals, and 10 spread spectrum correction signals are sent into the coupling network 26 at the forward emitted antenna 25 radiating surface back side of satellite 2; Coupling network 26 is connected with each forward emitted passage, and coupling network 26 exports the superposed signal of 10 spread spectrum correction signals, and diagram 3 is shown in by the frequency domain schematic diagram of superposition correction signal; Satellite 2 carries out filtering to superposition correction signal and is converted to signal center's frequency of the back receive path of satellite 2, satellite 2 carries out frequency division multiplexing using the superposition correction signal after frequency conversion as 10 back receive path data of an individual passage and satellite, diagram 4 is shown in by the frequency domain schematic diagram of the signal B after frequency division multiplexing, then use back processor 28 on star to carry out filtering, amplification, frequency-conversion processing to signal B, and use transmitting antenna 29 on star to launch.
Ground station 1 uses terrestrial receiving antenna 15 to receive the signal of transmitting antenna 29 on star, and use the first solution frequency division multiplexer 16 carry out solution frequency division multiplexing obtain 10 back channel signals and superposition correction signal, ground station 1 uses 10 spreading codes to carry out despreading process to superposition correction signal, and carry out amplitude with 10 the spread spectrum correction signals sent, phase place and time delay comparison, and then obtain the amplitude fading of 10 forward paths, phase place change and Delay, ground station 1 is with the amplitude fading of first forward path, phase place change and Delay are benchmark, to the amplitude of other channel datas, phase place and time delay correct, complete forward direction calibration work.
In the present invention, forward direction correction signal adopts mutually orthogonal multiple spread-spectrum signals, is superimposed and passes ground back by return link after coupling on star, and because spread-spectrum signal has orthogonality, then superposition can't affect the despreading process of ground station 1.In addition, in the present invention, forward direction correction signal is being transmitted on star of being produced by ground station 1, then has on star and pass ground station 1 back through return link after coupling, avoids the problem that traditional Calibration Method needs calibration station, thus simplifies system, just with later maintenance.
Embodiment 2:
An alternative embodiment of the invention is the scene adopting distributed ground station, refers to Fig. 5, surface deployment Liang Ge ground station and ground station 1 and ground station 24, and system forward has 80 channel datas to need by i.e. satellite 5 in terrestrial transmission to star.Back has 40 channel datas to need to be transferred to ground by star, and each forward path data and back channel data bandwidth are 7MHz.Star to configure on two directional receiving antennas and star reception antenna 2 52 on reception antenna 1 and star, point to ground station 1 and ground station 24 respectively.
40 forward path data are transmitted to reception antenna on star 1 in ground station 1, and the mode of the data acquisition frequency division multiplexing of 40 passages is transmitted, and considers the isolation of each passage, and the interval of carrying out each adjacent frequency during frequency division multiplexing is taken as 10MHz.Other 40 forward path data are transmitted to reception antenna on star 2 52 in ground station 24, and the mode of the data acquisition frequency division multiplexing of 40 passages is transmitted, and considers the isolation of each passage, and the interval of carrying out each adjacent frequency during frequency division multiplexing is taken as 10MHz.
The spread spectrum correction signal of the 7MHz bandwidth that ground station 24 generation 80 is mutually orthogonal, send into ground stations 1 for wherein 40, the signal as 40 forward paths carries out frequency division multiplexing.Ground station's one 3 pairs of forward direction correction signals use ground launch antenna 1 to launch after using the first frequency division multiplexer 1 to carry out frequency division multiplexing; Ground station 24 uses ground launch antenna 2 34 to launch after using the second frequency division multiplexer 2 32 to carry out frequency division multiplexing other 40 spread spectrum correction signals.
Satellite 2 uses reception antenna 1 on star to receive the signal of ground launch antenna 1, forward direction processor one 53 pairs of signals on star are used to carry out the process such as filtering, amplification, frequency conversion, then use second to separate frequency division multiplexer one 55 pairs of signals and carry out solution frequency division multiplexing, obtain 40 spread spectrum correction signals.Satellite 2 uses reception antenna 2 52 on star to receive the signal of ground launch antenna 2 34, forward direction processor 2 54 pairs of signals on star are used to carry out the process such as filtering, amplification, frequency conversion, then use second to separate frequency division multiplexer 2 56 pairs of signals and carry out solution frequency division multiplexing, obtain other 40 spread spectrum correction signals, amount to acquisition 80 spread spectrum correction signals.
Satellite 2 sends 80 the spread spectrum correction signals obtained into the coupling network 26 at the forward emitted antenna 25 radiating surface back side of satellite 2, and coupling network 26 is connected with each forward emitted passage, and coupling network 26 exports the superposed signal of 80 spread spectrum correction signals.Satellite 2 uses filtering frequency converter 30 carry out filtering and be converted to signal center's frequency of the back receive path of satellite 2 to superposition correction signal, satellite 2 uses the second frequency division multiplexer 27 to carry out frequency division multiplexing as 40 back receive path data of an individual passage and satellite the superposition correction signal after frequency conversion, then use back processor 28 on star to carry out filtering, amplification, frequency-conversion processing, and use transmitting antenna 29 on star to launch.
Ground station 24 uses terrestrial receiving antenna 15 to receive the signal of transmitting antenna 29 on star, and uses the first solution frequency division multiplexer 16 to carry out solutions frequency division multiplexing to obtain 40 back channel signals and superpose correction signal.Ground station 24 uses 80 spreading codes to carry out despreading process to superposition correction signal, and carry out amplitude, phase place and time delay comparison with 80 the spread spectrum correction signals sent, and then the amplitude fading of acquisition 80 forward paths, phase place change and Delay, ground station with the amplitude fading of first forward path, phase place change and Delay for benchmark, the amplitude of other channel datas, phase place and time delay are corrected, completes forward direction calibration work.
The present embodiment surface deployment Liang Ge ground station, being responsible for the transmission of part forward path signals respectively, is simple extension of the present invention.
In the present invention, forward direction correction signal adopts mutually orthogonal multiple spread-spectrum signals, is superimposed and passes ground back by return link after coupling on star, and because spread-spectrum signal has orthogonality, then superposition can't affect the despreading process of ground station.In addition, in the present invention, forward direction calibration signal is being transmitted on star of being produced by ground station, then has on star and pass ground back through return link after coupling, avoids the problem that traditional Calibration Method needs calibration station, thus simplifies system, just with later maintenance.
In sum, ground station of the present invention produces multiple mutually orthogonal spread spectrum correction signal, and to carry out after frequency division multiplexing by terrestrial transmission on star as each forward path data, after star being separated frequency division multiplexing, the correction signal in each passage is accessed the coupling network at the satellite forward emitted antenna back side, the superposed signal of output calibration signal, and as a back tunnel data transport to ground, the despreading process that ground station adds spread spectrum correction signal through the stack obtains forward path time delay, amplitude and phase information, and then completes back calibration.The present invention, without the need to arranging multiple calibration station, reduces the complexity of system maintenance; Spread spectrum correction signal produces on ground, instead of directly produces on star, reduces on-board equipment amount.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a satellite communication system, it comprises at least one ground station and adopts the satellite of satellite communication with this ground station: wherein, and this ground station comprises the first frequency division multiplexer, ground launch antenna, terrestrial receiving antenna, the first solution frequency division multiplexer, channel correcting device; This satellite comprises forward direction processor on reception antenna on star, star, second and separates frequency division multiplexer, Forward receiving antenna, the second frequency division multiplexer, transmitting antenna on back processor, star on star; It is characterized in that: this ground station also comprises spread-spectrum signal generator, despreading processor; This satellite also comprises coupling network, filtering frequency converter;
The Form generation N number of mutually orthogonal spread spectrum correction signal of this spread-spectrum signal generator for making correction signal adopt spread-spectrum signal; This first frequency division multiplexer is used for N number of spread spectrum correction signal to be modulated to respectively in N number of forward data passage to carry out frequency division multiplexing; This ground launch antenna is used for the signal after this first frequency division multiplexer frequency division multiplexing to be sent to this satellite as transmitting of this ground station;
On this star, reception antenna is for receiving transmitting of this ground station; On this star, forward direction processor is used for carrying out forward direction process to transmitting of this ground station; This second solution frequency division multiplexer is used for carrying out solution frequency division multiplexing to the signal through forward direction process and isolates N number of correction signal, and N number of correction signal is sent into the coupling network at the radiating surface back side of this forward emitted antenna of satellite; This coupling network is connected with each forward emitted passage of this forward emitted antenna, and this coupling network exports the superposed signal of N number of correction signal; This filtering frequency converter carries out filtering to superposed signal and is converted to signal center's frequency of the back receive path of satellite; This second frequency division multiplexer is used for the superposition correction signal after frequency conversion to carry out frequency division multiplexing as the back receive path data of an individual passage and satellite; On this star, back processor is used for the signal after frequency division multiplexing to carry out filtering, amplification, frequency-conversion processing transmitting as this satellite, and transmitting of this satellite transfers to this ground station by transmitting antenna on this star;
This terrestrial receiving antenna is for receiving transmitting from this satellite; This first solution frequency division multiplexer is used for transmitting of this satellite to separate frequency division multiplexing acquisition superposition correction signal; The N number of mutually orthogonal spread spectrum correction signal that this despreading processor uses transmitting terminal to produce carries out despreading process, so obtain the amplitude fading of each forward path, phase place changes and Delay; This channel correcting device to be used for the amplitude fading of first forward path, phase place change and Delay, for benchmark, correcting the amplitude of other forward path data, phase place and time delay.
2. satellite communication system as claimed in claim 1, it is characterized in that: this second frequency division multiplexer is used for the superposition correction signal after frequency conversion to carry out frequency division multiplexing, the centre frequency maximum modulation of back receive path signal to f as the back receive path data of an individual passage and satellite
h, superposition correction signal is modulated to center frequency point f
h+ Δ, wherein Δ is the frequency interval of data channel and correction signal.
3. the forward direction Calibration Method in a satellite communication, it is applied in satellite communication system as claimed in claim 1, adopting the different passage different distortions caused affected by environment in frequency division multiplexing mode channel signal process for compensating forward direction feed section between satellite from ground station, it is characterized in that: the back Calibration Method in this satellite communication comprises the following steps:
The first step, ground station: produce N number of mutually orthogonal spread spectrum correction signal, and N number of correction signal is modulated in N number of forward data passage respectively carries out frequency division multiplexing, ground station carries out radio frequency processing the signal after frequency division multiplexing and uses antenna transmission to go out;
Second step, satellite: the signal receiving this ground station, carries out filtering, amplification, down-conversion, solution frequency division multiplexing, isolates N number of correction signal, and N number of correction signal is sent into the coupling network at this back side, forward emitted aerial radiation face; This coupling network is connected with each forward emitted passage, and this coupling network exports the superposed signal of N number of correction signal; Filtering is carried out to superposed signal and is converted to signal center's frequency of satellite back receive path; Superposition correction signal after frequency conversion is carried out frequency division multiplexing as the back receive path data of an individual passage and satellite; Signal after frequency division multiplexing is carried out filtering, amplification, frequency-conversion processing, transfers to ground station by star ground back feeding link;
3rd step, return to ground: solution frequency division multiplexing is carried out to the signal received and obtains superposition correction signal, and the N number of mutually orthogonal spread spectrum correction signal using transmitting terminal to produce carries out despreading process, and then obtain each forward path amplitude fading, phase place change and Delay, ground station, corrects the amplitude of other forward path data, phase place and time delay for benchmark with the amplitude fading of first forward path, phase place change and Delay.
4. the forward direction Calibration Method in satellite communication as claimed in claim 3, is characterized in that: the superposition correction signal after frequency conversion is carried out frequency division multiplexing as the back receive path data of an individual passage and satellite: the centre frequency maximum modulation of back receive path signal to f
h, superposition correction signal is modulated to center frequency point f
h+ Δ, wherein Δ is the frequency interval of data channel and correction signal.
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| CN108683447A (en) * | 2018-04-09 | 2018-10-19 | 中国电子科技集团公司第三十八研究所 | A kind of satellite communication forward feeder links Doppler frequency difference removing method and system |
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