CN101674127B - Compound synchronization control method of multi-frequency time division multiple access satellite communication system - Google Patents
Compound synchronization control method of multi-frequency time division multiple access satellite communication system Download PDFInfo
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- CN101674127B CN101674127B CN2009100756107A CN200910075610A CN101674127B CN 101674127 B CN101674127 B CN 101674127B CN 2009100756107 A CN2009100756107 A CN 2009100756107A CN 200910075610 A CN200910075610 A CN 200910075610A CN 101674127 B CN101674127 B CN 101674127B
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Abstract
The invention discloses a compound synchronization control method of a multi-frequency time division multiple access satellite communication system, which relates to a synchronization control technology in the field of satellite communication. The compound synchronization control method adopts the method which combines auxiliary distance measurement with self-distance measurement, thereby being capable of effectively realizing the rapid initial capture timing of the system and effectively solving the simultaneously network access problem of a large number of earth stations; and the compound synchronization control method adopts the designed method which combines main station auxiliary closed-loop control with self-transmitting and self-receiving closed-loop control, thereby effectively realizing the precise synchronization and keeping timing of multiple types of the earth stations with different transmitting and receiving capabilities. The compound synchronization control method has the advantages of fast network access speed, multiple synchronization control ways, ability of adapting to a plurality of station types for working in a same network, no restriction by the capacity of the network and the like, thereby being particularly 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 synchronisation control means in multi-frequency time division multiple access (MF-TDMA) satellite communication field, be specially adapted to system based on the netted networking of MF-TDMA of satellite Transparent Transponder communication.
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; It in can satisfying preferably group-net communication between the user who leads; 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 to class of business and site type.
Yet because the MF-TDMA satellite communication system is easy to carry out dilatation through the expansion carrier number, and the different rates through each carrier wave is set is to support a large amount of different big or small type earth stations with net work.When network size is big, there be the difficulty or the chronic problem that networks of networking simultaneously.In addition, different big or small type earth stations have distinct transmit and receiving ability, adopt the method in traditional tdma system to be difficult to realize the synchronous maintenance at all stations.
Summary of the invention
Technical problem to be solved by this invention is to avoid weak point in the above-mentioned background technology and provides a kind of and can carry out quick initial acquisition, adapts to the MF-TDMA communication system compound synchronization control method that the polymorphic type site type keeps synchronously.The present invention utilizes carrier wave saltus step transmission and the reception of MF-TDMA satellite communication system, the characteristics such as occupation mode of all kinds of time slot channel (reference, control, range finding, data), and each earth stands in and carries out confirming synchronous control mode voluntarily according to communication capacity, interoperation relationships and communication log etc. before the initial acquisition.Auxiliary by main website, that the multiple mode of our station internal loopback is respectively stood in conjunction with realization Synchronization Control.Have respectively stand in the system quick initial acquisition regularly with have the precise synchronization maintenance timing of different emissions with all kinds of earth stations of receiving ability, and efficiently solve a large amount of earth stations problem that networks simultaneously.The present invention has into net spee, and synchronous control mode is more, can adapt to the same net work of polymorphic type site type, does not receive the advantages such as restriction of network capacity.
The objective of the invention is to realize like this, comprise step:
Initial acquisition
1. the professional station of each satellite communication receives the reference burst that the satellite communication main website sends, and resolves the frame plan information that carries with reference to burst, obtains ranging slot information, the free gap information of our station;
The judgment rule of 2. going into to move back net record, transmitting-receiving traffic rate ability, the sending probability that presets and presetting according to the professional station of satellite communication sends the range finding burst in each comfortable ranging slot of the professional station of satellite communication, the free time slot of our station;
3. the professional station of range finding timing error information, satellite communication that feeds back to the professional station range finding of satellite communication burst based on the satellite communication main website, the professional station of each satellite communication receives the range finding burst that our station sends and obtains the range finding timing error information; The professional station of each satellite communication judges whether range finding timing error value surpasses the threshold value of setting; If range finding timing error value surpasses threshold value is then adjusted our station based on the range finding timing error transmission timing value; Repeat 1. to arrive 3. process, till the range finding timing error is less than the threshold value of setting; If range finding timing error value does not surpass threshold value, then do not adjust the transmission timing value of our station, initial acquisition finishes, and changes the synchronous maintenance stage over to;
The synchronous maintenance stage
4. the professional station of each satellite communication receives the reference burst that the satellite communication main website sends; The frame plan information that parsing is carried with reference to burst; Plan in distributing to the control time slot of our station, to send the control burst based on frame, in distributing to the data slot of our station, send data burst signals;
5. the satellite communication main website receives the control burst that send at the professional station of each satellite communication; According to presetting rule; Feed back to the timing error information of the professional station control of the satellite communication burst of regular appointment; The professional station of the unspecified satellite communication of presetting rule receives the data burst signals acquisition timing error information that our station sends, and the professional station of each big or small type satellite communication is according to the transmission timing value of timing error information adjustment our station; In the communication process, carry out 4., 5. step, constantly adjust the transmission timing value of our station;
Carry out the compound Synchronization Control of multi-frequency time division multiple access satellite communication system.
The present invention compares background technology and has following advantage:
1, the present invention has adopted the auxiliary range finding and the associated methods of finding range certainly, has improved multistation and has gone into net spee simultaneously.
2, the present invention adopts the auxiliary closed-loop control of main website of design and the method that the internal loopback closed-loop control combines, and can adapt to the same net work of polymorphic type site type, and not receive the restriction of network capacity basically.
Description of drawings
Fig. 1 is a workflow diagram of the present invention.
Fig. 2 is a multicarrier frame structure sketch map of the present invention.
Embodiment
With reference to Fig. 1, Fig. 2, the present invention includes 1, under the cooperation of frame plan all kinds of time slot channels of comprehensive utilization, 2, the confirming of synchronous control mode, 3, the initial acquisition design, 4, keep design synchronously.
The multicarrier frame structure is as shown in Figure 2, and Fig. 2 is a multicarrier frame structure sketch map of the present invention.System all is provided with free data slot in the data slot of each carrier wave.If professional head of a station's time does not have professional transmission on our station carrier wave on duty, then main website will be free data slot channel of its periodic allocation.Professional station gains freedom behind the data slot channel, if there is non-real-time service to transmit, but service data transmission then; If there is not business data transmission, then send dummy data.The station that has the internal loopback ability among the present invention utilizes this free data slot to realize the synchronization control function of earth station.
Main website assist in synchronization control mode is adopted at the station that does not have the internal loopback ability.Utilization is controlled the time slot channel and is realized with reference to the time slot channel.Main website detects the control burst of sending at professional station, extracts synchronous error, through with reference to burst control information being sent back professional station, realizes the closed-loop control at professional station.
Initial acquisition is accomplished through range finding.The purpose of range finding is to survey the burst that our station sends and whether drop on assigned address through sending the range finding burst, and through with the error of relatively coming delivery time with reference to burst position.Utilize the error amount modified R TT value that obtains to reach the purpose that burst is accurately arranged.In order to prevent that the realization of disturbing or guaranteeing range finding is caused at other station, before sending the range finding burst, need to obtain the approximation of our station and intersatellite round chain-circuit time delay (RTT).Being similar to the worth acquisition mode of RTT has: 1 utilizes earth station position and satellite position to estimate moved back being similar to of preceding RTT value 3 RTT of the main website values of storing of net 2 last time.Range finding utilizes ranging slot or data slot to accomplish, and after earth station obtains time slot in the works from frame, sends the range finding burst with certain probability.Receive end and receive that the range finding burst obtains corresponding deviation, revises the RTT value according to deviate, till satisfying error requirements.
Control time slot of maintenance utilization synchronously or data slot adopt aforesaid main website to assist or the internal loopback closed-loop fashion realizes.
Workflow of the present invention is as shown in Figure 1, and Fig. 1 is a workflow diagram of the present invention, comprises that step is following:
Initial acquisition
1. the professional station of each satellite communication receives the reference burst that the satellite communication main website sends, and resolves the frame plan information that carries with reference to burst, obtains ranging slot information, the free gap information of our station.
The judgment rule of 2. going into to move back net record, transmitting-receiving communication capacity, the sending probability that presets and presetting according to the professional station of satellite communication sends the range finding burst in each comfortable ranging slot of the professional station of satellite communication, the free time slot of our station.The sending probability that embodiment presets is 0.2; The judgment rule that presets has the internal loopback ability and moves back the net time during less than 1 day for the satellite communication business stands in carrier wave on duty; The satellite communication business stands in sends the range finding burst in the free time slot of our station, otherwise the satellite communication business stands in the probability transmission range finding burst to preset in the ranging slot.
3. the professional station of range finding timing error information, satellite communication that feeds back to the professional station range finding of satellite communication burst based on the satellite communication main website, the professional station of each satellite communication receives the range finding burst that our station sends and obtains the range finding timing error information.The professional station of each satellite communication of embodiment judges whether range finding timing error value surpasses the threshold value of setting; If range finding timing error value surpasses threshold value is then adjusted our station according to the range finding timing error transmission timing value; Repeat 1. to arrive 3. process, till the range finding timing error is less than the threshold value of setting; If range finding timing error value does not surpass threshold value, then do not adjust the transmission timing value of our station, initial acquisition finishes, and changes the synchronous maintenance stage over to.
The synchronous maintenance stage
4. the professional station of each satellite communication receives the reference burst that the satellite communication main website sends; The frame plan information that parsing is carried with reference to burst; Plan in distributing to the control time slot of our station, to send the control burst according to frame, in distributing to the data slot of our station, send data burst signals.
5. the satellite communication main website receives the control burst that send at the professional station of each satellite communication; According to presetting rule; Feed back to the timing error information of the professional station control of the satellite communication burst of regular appointment; The professional station of the unspecified satellite communication of presetting rule receives the data burst signals acquisition timing error information that our station sends, and the professional station of each big or small type satellite communication is according to the transmission timing value of timing error information adjustment our station.The embodiment presetting rule is for to judge the satellite communication business stands in whether have the internal loopback ability on the carrier wave on duty separately, if there is the professional station of then this satellite communication to be the station of presetting rule appointment, if there is not the professional station of then this satellite communication to be the unspecified station of presetting rule; In the communication process, carry out 4., 5. step, constantly adjust the transmission timing value of our station.
Carry out the compound Synchronization Control of multi-frequency time division multiple access satellite communication system.
Claims (1)
1. compound synchronization control method of multi-frequency time division multiple access satellite communication system is characterized in that comprising step:
Initial acquisition
1. the professional station of each satellite communication receives the reference burst that the satellite communication main website sends, and resolves the frame plan information that carries with reference to burst, obtains ranging slot information, the free gap information of our station;
The judgment rule of 2. going into to move back net record, transmitting-receiving traffic rate ability, the sending probability that presets and presetting according to the professional station of satellite communication sends the range finding burst in each comfortable ranging slot of the professional station of satellite communication, the free time slot of our station;
3. the professional station of range finding timing error information, satellite communication that feeds back to the professional station range finding of satellite communication burst based on the satellite communication main website, the professional station of each satellite communication receives the range finding burst that our station sends and obtains the range finding timing error information; The professional station of each satellite communication judges whether range finding timing error value surpasses the threshold value of setting; If range finding timing error value surpasses threshold value is then adjusted our station based on the range finding timing error transmission timing value; Repeat 1. to arrive 3. process, till the range finding timing error is less than the threshold value of setting; If range finding timing error value does not surpass threshold value, then do not adjust the transmission timing value of our station, initial acquisition finishes, and changes the synchronous maintenance stage over to;
The synchronous maintenance stage
4. the professional station of each satellite communication receives the reference burst that the satellite communication main website sends; The frame plan information that parsing is carried with reference to burst; Plan in distributing to the control time slot of our station, to send the control burst based on frame, in distributing to the data slot of our station, send data burst signals;
5. the satellite communication main website receives the control burst that send at the professional station of each satellite communication; According to presetting rule; Feed back to the timing error information of the professional station control of the satellite communication burst of regular appointment; The professional station of the unspecified satellite communication of presetting rule receives the data burst signals acquisition timing error information that our station sends, and the professional station of each big or small type satellite communication is according to the transmission timing value of timing error information adjustment our station; In the communication process, carry out 4., 5. step, constantly adjust the transmission timing value of our station;
Wherein, The judgment rule that step presets in 2. has the internal loopback ability and moves back the net time during less than 1 day for the satellite communication business stands in carrier wave on duty; The satellite communication business stands in sends the range finding burst in the free time slot of our station, otherwise the satellite communication business stands in the probability transmission range finding burst to preset in the ranging slot;
Wherein, The 5. middle presetting rule of step is for to judge the satellite communication business stands in whether have the internal loopback ability on the carrier wave on duty separately; If it is the station of presetting rule appointment that the professional station of then this satellite communication is arranged, if there is not the professional station of then this satellite communication to be the unspecified station of presetting rule.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111711508A (en) * | 2020-04-26 | 2020-09-25 | 四川润泽经伟信息技术有限公司 | User interference system, method and device based on satellite communication countermeasure |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105515639B (en) * | 2015-12-02 | 2018-09-25 | 中国工程物理研究院电子工程研究所 | A kind of Utility Satellite high speed signal time synchronization method |
| CN118018101B (en) * | 2024-04-08 | 2024-06-04 | 中国电子科技集团公司第五十四研究所 | TDMA layered network construction method based on multi-station multi-carrier demodulation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111711508A (en) * | 2020-04-26 | 2020-09-25 | 四川润泽经伟信息技术有限公司 | User interference system, method and device based on satellite communication countermeasure |
| CN111711508B (en) * | 2020-04-26 | 2023-04-28 | 四川润泽经伟信息技术有限公司 | User interference system, method and device based on satellite communication countermeasure |
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