CN101674125A - Distributed frequency control method of multi-frequency time division multiple access satellite communication system - Google Patents
Distributed frequency control method of multi-frequency time division multiple access satellite communication system Download PDFInfo
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- CN101674125A CN101674125A CN200910075607A CN200910075607A CN101674125A CN 101674125 A CN101674125 A CN 101674125A CN 200910075607 A CN200910075607 A CN 200910075607A CN 200910075607 A CN200910075607 A CN 200910075607A CN 101674125 A CN101674125 A CN 101674125A
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Abstract
The invention discloses a distributed frequency control method of a multi-frequency time division multiple access satellite communication system, which relates to a whole network frequency control technology in the field of satellite communication. The distributed frequency control method adopts the distributed whole network frequency control which takes the receiving frequency of a main station as the reference, thereby effectively reducing the complexity of the main station and improving the autonomous operation control abilities of all stations in the network on the basis of effectively eliminating the frequency drift caused by the clock difference of all the stations in the whole network and the frequency difference caused by satellite transponder signals and protecting the reliable operation of the whole network. The distributed frequency control method has the advantages of simple realization and reliable operation, thereby being especially applicable to a multi-frequency time division multiple access mesh network system which is based on a satellite transparent transponder for communication.
Description
Technical field
The present invention relates to the control method for frequency in multi-frequency time division multiple access (MF-TDMA) satellite communication field, be specially adapted to the netted group network system of MF-TDMA based on the communication of satellite Transparent Transponder.
Background technology
The MF-TDMA satellite communication system has access and exchange capacity flexibly, flexible net structure and virtual subnet ability, satellite resource utilance and extension of network ability efficiently, can satisfy preferably between middle speed node and based on group-net communication between the user of data service, at home and abroad be widely used gradually in the satellite communication, it is a kind of two-dimentional multi-access mode that frequency division and time-division combine that adopts, and utilizes frequency hopping transmission and reception, variable Rate and virtual circuit technology can realize the flexible networking of big or small terminal room at class of business and site type.
The centralized FREQUENCY CONTROL technology of general employing in the MF-TDMA satellite communication system.Under the centralized control, receive each professional station by main website and send signal acquisition frequency departure, then by being handed down to each professional station with reference to burst, the closed loop frequency adjustment of realization main website assist type.Yet its deficiency is that main website process information amount is bigger when network size is big, realizes complicatedly, and realization of each professional station FREQUENCY CONTROL main website that places one's entire reliance upon is unfavorable for autonomous operation control at each professional station.
Summary of the invention
Technical problem to be solved by this invention be to avoid the weak point in the above-mentioned background technology and provide the control of a kind of distributed frequency down the satellite communication main website realize simple, the method for MF-TDMA satellite communication system distributed frequency control that each professional station can autonomous operation.The present invention use design based on the distributed the whole network control method for frequency of main website receive frequency as benchmark, utilize the carrier wave saltus step of MF-TDMA satellite communication system to send and the characteristics that receive and carrier wave on duty is provided with, each earth station can monitor the burst that the part our station sends to other station.Respectively the station is adjusted our station and is sent frequency deviation by the difference between the reference burst frequency deviation of relatively our station transmission signal frequency deviation and main website transmission, realizes the Autonomous Control of respectively standing.
Characteristics such as the present invention also has the main website of reduction complexity and improves each professional station autonomous operation control ability in the network, and whole network operation reliability is improved, and cost reduces, and designing for manufacturing is simple and easy.
The object of the present invention is achieved like this, comprises step:
1. the reference burst of satellite communication main website internal loopback our station transmission utilizes the transmission frequency of proofreading and correct the satellite communication main website with reference to burst;
2. the satellite communication main website is by sending the transmission frequency deviation information that issues the satellite communication main website with reference to the professional station of burst each satellite communication in satellite communication system;
3. the professional station of each satellite communication receives the reference burst that the satellite communication main website sends, and obtains with reference to the receive frequency deviation of burst with reference to the satellite communication main website transmission frequency deviation information that carries in the burst information;
4. the receive frequency at the professional station of each satellite communication is adjusted with reference to the receive frequency deviation of burst according to obtaining, and adjusted receive frequency is the receive frequency and the receive frequency deviation sum value that obtains with reference to burst at the professional station of satellite communication;
5. the professional station of each satellite communication is according to the pre-compensation value that obtains to obtain with reference to the receive frequency deviation of burst and satellite communication main website transmission frequency deviation the professional transmission frequency of standing of satellite communication, pre-compensation value multiply by behind the preset value difference with satellite communication main website transmission frequency deviation for obtaining receive frequency deviation with reference to burst, and the transmission frequency behind the precompensation of the professional station of satellite communication is the transmission frequency at the professional station of satellite communication and the difference of pre-compensation value;
6. the professional station of each satellite communication receives the data burst signals that our station sends, and obtains the frequency departure of data burst signals; The difference of the frequency departure of calculated data burst and predetermined frequency deviation threshold value according to the size of difference with preset algorithm, obtains the adjustment amount of our station transmission frequency deviation, adjusts transmission frequency according to the adjustment amount of frequency departure;
Carry out the control of multi-frequency time division multiple access satellite communication system distributed frequency.
The present invention the 6. algorithm that presets described in the step is:
Δf
T＝η×int(Δf，100) (1)
Δ f in the formula (1)
TBe the frequency departure adjustment amount, unit is a hertz; η is for adjusting the factor, η when multi-frequency time division multiple access satellite communication system is operated in the Ku frequency range=1.2, η when being operated in the Ka frequency range=1.5; Int (a, b) expression numerical value a is divided by the integer part of b; Δ f is the frequency departure of data burst signals and the difference of predetermined frequency deviation threshold value, and unit is a hertz.
The present invention compares background technology and has following advantage:
1, the distributed frequency control technology of the present invention's employing effectively reduces the complexity of main website.
2, the distributed frequency control technology of the present invention's employing has improved the autonomous operation control ability at each professional station in the network.
3, the distributed frequency control technology of the present invention's employing improves network operation reliability, and cost reduces, and designing for manufacturing is simple and easy.
Description of drawings
Fig. 1 is a workflow diagram of the present invention.
Fig. 2 is a multicarrier frame structure schematic diagram of the present invention.
Embodiment
With reference to Fig. 1, Fig. 2, the present invention mainly comprises 1, main website calibration reference burst frequency deviation; 2, the precompensation transmission frequency of respectively standing; 3, the Autonomous Control of respectively standing is adjusted transmission frequency.
System is a benchmark with the main website receive frequency, and the main website internal loopback is proofreaied and correct transmission frequency with reference to burst, till the reference burst frequency deviation that receives is less than set point.
Main website is by issuing our station transmission frequency deviation with reference to burst.Each station receives with reference to burst, estimates with reference to the burst frequency deviation, utilizes reference the burst frequency deviation of this estimation and the frequency deviation value that main website issues, the precompensation transmission frequency, with eliminate satellite repeater and stand between the time clock correction frequency deviation that causes.
In normal course of communications, utilize the carrier wave saltus step of MF-TDMA satellite communication system to send and the characteristics that receive and carrier wave on duty is provided with, each earth station can monitor the burst that the part our station sends to other station, the multicarrier frame structure as shown in Figure 2, Fig. 2 is a multicarrier frame structure schematic diagram of the present invention.Each station utilizes carrier supervision on duty partly to send to the burst at other station, and estimates that our station sends the frequency deviation of signal.Utilize our station to send the frequency deviation of signal and the difference between reference burst frequency deviation, the different transmission frequency of revising our stations realize respectively autonomous closed loop frequency control at station.
Workflow of the present invention as shown in Figure 1, Fig. 1 is a workflow diagram of the present invention, comprises that step is as follows:
1. the reference burst of satellite communication main website internal loopback our station transmission utilizes the transmission frequency of proofreading and correct the satellite communication main website with reference to burst.
2. the satellite communication main website is by sending the transmission frequency deviation information that issues the satellite communication main website with reference to the professional station of burst each satellite communication in satellite communication system.
3. the professional station of each satellite communication receives the reference burst that the satellite communication main website sends, and obtains with reference to the receive frequency deviation of burst with reference to the satellite communication main website transmission frequency deviation information that carries in the burst information.
4. the receive frequency at the professional station of each satellite communication is adjusted with reference to the receive frequency deviation of burst according to obtaining, and adjusted receive frequency is the receive frequency and the receive frequency deviation sum value that obtains with reference to burst at the professional station of satellite communication.
5. the professional station of each satellite communication is according to the pre-compensation value that obtains to obtain with reference to the receive frequency deviation of burst and satellite communication main website transmission frequency deviation the professional transmission frequency of standing of satellite communication, pre-compensation value multiply by behind the preset value η difference with satellite communication main website transmission frequency deviation for obtaining receive frequency deviation with reference to burst, transmission frequency behind the precompensation of the professional station of satellite communication is the transmission frequency at the professional station of satellite communication and the difference of pre-compensation value, wherein preset value η is for adjusting the factor, η when multi-frequency time division multiple access satellite communication system is operated in the Ku frequency range=1.2, η when being operated in the Ka frequency range=1.5.
6. the professional station of each satellite communication receives the data burst signals that our station sends, and obtains the frequency departure of data burst signals; According to presetting algorithm computation frequency departure adjustment amount, adjust transmission frequency according to the adjustment amount of frequency departure; The present invention of this step presets algorithm
Δf
T＝η×int(Δf，100) (1)
Δ f in the formula (1)
TBe the frequency departure adjustment amount, unit is a hertz; η is for adjusting the factor, η when multi-frequency time division multiple access satellite communication system is operated in the Ku frequency range=1.2, η when being operated in the Ka frequency range=1.5; Int (a, b) expression numerical value a is divided by the integer part of b; Δ f is the frequency departure of data burst signals and the difference of predetermined frequency deviation threshold value, and unit is a hertz.
Carry out the control of multi-frequency time division multiple access satellite communication system distributed frequency.
Claims (2)
1, a kind of distributed frequency control method of multi-frequency time division multiple access satellite communication system is characterized in that comprising step:
1. the reference burst of satellite communication main website internal loopback our station transmission utilizes the transmission frequency of proofreading and correct the satellite communication main website with reference to burst;
2. the satellite communication main website is by sending the transmission frequency deviation information that issues the satellite communication main website with reference to the professional station of burst each satellite communication in satellite communication system;
3. the professional station of each satellite communication receives the reference burst that the satellite communication main website sends, and obtains with reference to the receive frequency deviation of burst with reference to the satellite communication main website transmission frequency deviation information that carries in the burst information;
4. the receive frequency at the professional station of each satellite communication is adjusted with reference to the receive frequency deviation of burst according to obtaining, and adjusted receive frequency is the receive frequency and the receive frequency deviation sum value that obtains with reference to burst at the professional station of satellite communication;
5. the professional station of each satellite communication is according to the pre-compensation value that obtains to obtain with reference to the receive frequency deviation of burst and satellite communication main website transmission frequency deviation the professional transmission frequency of standing of satellite communication, pre-compensation value multiply by behind the preset value difference with satellite communication main website transmission frequency deviation for obtaining receive frequency deviation with reference to burst, and the transmission frequency behind the precompensation of the professional station of satellite communication is the transmission frequency at the professional station of satellite communication and the difference of pre-compensation value;
6. the professional station of each satellite communication receives the data burst signals that our station sends, and obtains the frequency departure of data burst signals; The difference of the frequency departure of calculated data burst and predetermined frequency deviation threshold value according to the size of difference with preset algorithm, obtains the adjustment amount of our station transmission frequency deviation, adjusts transmission frequency according to the adjustment amount of frequency departure;
Carry out the control of multi-frequency time division multiple access satellite communication system distributed frequency.
2, a kind of distributed frequency control method of multi-frequency time division multiple access satellite communication system according to claim 1 is characterized in that: the 6. the algorithm that presets described in the step be
Δf
T＝η×int(Δf，100) (1)
Δ f in the formula (1)
TBe the frequency departure adjustment amount, unit is a hertz; η is for adjusting the factor, η when multi-frequency time division multiple access satellite communication system is operated in the Ku frequency range=1.2, η when being operated in the Ka frequency range=1.5; Int (a, b) expression numerical value a is divided by the integer part of b; Δ f is the frequency departure of data burst signals and the difference of predetermined frequency deviation threshold value, and unit is a hertz.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904629A (en) * | 2012-11-12 | 2013-01-30 | 中国电子科技集团公司第五十四研究所 | Parameter agility time division multiple access (TDMA) communication method |
| CN103580766A (en) * | 2013-11-22 | 2014-02-12 | 中国电子科技集团公司第五十四研究所 | Frequency control method of heterogeneous station type of multi-frequency TDMA (time division multiple access) satellite communication system |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2874147B1 (en) * | 2004-08-05 | 2006-09-22 | Cit Alcatel | DEVICE FOR ALLOCATING SHARED RESOURCES OF A COMMUNICATION NETWORK BY ALLOCATING TEMPORAL INTERVALS OF A DYNAMICALLY ADAPTABLE TIME / FREQUENCY PLAN |
| EP2104983B1 (en) * | 2006-10-03 | 2014-02-26 | ViaSat, Inc. | Upstream resource allocation for satellite communications |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904629A (en) * | 2012-11-12 | 2013-01-30 | 中国电子科技集团公司第五十四研究所 | Parameter agility time division multiple access (TDMA) communication method |
| CN102904629B (en) * | 2012-11-12 | 2015-02-18 | 中国电子科技集团公司第五十四研究所 | Parameter agility time division multiple access (TDMA) communication method |
| CN103580766A (en) * | 2013-11-22 | 2014-02-12 | 中国电子科技集团公司第五十四研究所 | Frequency control method of heterogeneous station type of multi-frequency TDMA (time division multiple access) satellite communication system |
| CN103580766B (en) * | 2013-11-22 | 2017-02-08 | 中国电子科技集团公司第五十四研究所 | Frequency control method of heterogeneous station type of multi-frequency TDMA (time division multiple access) satellite communication system |
| 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 |
| 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 |
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