CN105281821A - Satellite channel intelligent switching method and system - Google Patents
Satellite channel intelligent switching method and system Download PDFInfo
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- CN105281821A CN105281821A CN201410243586.4A CN201410243586A CN105281821A CN 105281821 A CN105281821 A CN 105281821A CN 201410243586 A CN201410243586 A CN 201410243586A CN 105281821 A CN105281821 A CN 105281821A
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Abstract
The invention discloses a satellite channel intelligent switching method and system. The method comprises the steps that a primary TDM/TDMA satellite channel intelligent switching control subsystem is set; a multiplexing satellite channel intelligent switching control subsystem with multiplexing of control information and business is set; when a fault of the primary TDM/TDMA dedicated satellite channel intelligent switching control subsystem is detected, the working state of the multiplexing satellite channel intelligent switching control subsystem is switched to a primary working state by a switchover module; and after the primary TDM/TDMA satellite channel intelligent switching control subsystem recovers and is confirmed to be stable through detection, the working state of the primary TDM/TDMA satellite channel intelligent switching control subsystem is switched to the primary working state by the switchover module.
Description
Technical field
The present invention relates to satellite communication field, particularly a kind of satellite channel intelligence switching method and system.
Background technology
Existing fiber optic cable communications, satellite communication and short wave communication are the Primary communication modes of army, because this several communication can not be merged, cause the communication efficiency of army lower.
It is the direction that army communicates that fiber optic cable communications, satellite communication and short wave communication fusion formation are comprised cable network, satellite network with the large data network of shortwave net.
But this large data network is formed also has many technical problems to need to solve, one of them is exactly the satellite channel intelligence switching method and the system that how to provide a kind of dependable performance.
Summary of the invention
The object of this invention is to provide a kind of satellite channel intelligence switching method and system, the reliability exchanged to provide satellite channel.
According to a first aspect of the invention, satellite channel intelligence switching method of the present invention comprises the following steps:
Primary TDM/TDMA satellite channel intelligence is set and exchanges control subsystem;
Arrange and the multiple connection satellite channel intelligence of control information together with business multiple connection is exchanged control subsystem;
Wherein, when detecting that primary TDM/TDMA specific satellite channel intelligence exchanges control subsystem fault, multiple connection satellite channel intelligence is exchanged control subsystem and is switched to primary operating state by handover module;
Wherein, when detection primary TDM/TDMA satellite channel intelligence exchange control subsystem recovers and confirms stable after, the switching of primary TDM/TDMA satellite channel intelligence exchange control subsystem is got back to primary operating state by handover module.
According to a second aspect of the invention, satellite channel intelligence switching system of the present invention comprises:
Primary TDM/TDMA satellite channel intelligence exchanges control subsystem;
The multiple connection satellite channel intelligence of control information together with business multiple connection is exchanged control subsystem;
For described primary TDM/TDMA satellite channel intelligence is exchanged the handover module that one of control subsystem and multiple connection satellite channel intelligence exchange control subsystem are switched to primary operating state;
Wherein, when detecting that primary TDM/TDMA specific satellite channel intelligence exchanges control subsystem fault, multiple connection satellite channel intelligence is exchanged control subsystem and is switched to primary operating state by handover module;
Wherein, when detection primary TDM/TDMA satellite channel intelligence exchange control subsystem recovers and confirms stable after, the switching of primary TDM/TDMA satellite channel intelligence exchange control subsystem is got back to primary operating state by handover module.
Preferably, multiple connection satellite channel intelligence exchange control system comprises central station, satellite business channel and remote terminal, wherein central station system by the control command of remote terminal by multiplexer together with the miscellaneous service multiple connection to remote terminal, utilize traffic carrier to deliver to remote terminal; Remote terminal, by passing to the information of central station together with the business multiple connection at this station, utilizes traffic carrier to be sent to central station.
Preferably, primary TDM/TDMA specific satellite channel intelligence exchange control system comprises central station and remote terminal, and wherein central station adopts a TDM to go out continuously to channel, and all remote terminals share this channel, therefrom select the data issuing our station after reception; All remote terminals share a TDMA carrier wave as entering to channel, and each remote terminal sends information to central station at respective specific time slot.
Relative to prior art, Advantageous Effects of the present invention is, ensures the transmitting of satellite network management system control information.
Below in conjunction with accompanying drawing, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of satellite channel of the present invention intelligence switching system;
Fig. 2 is the schematic diagram that multiple connection satellite channel of the present invention intelligence exchanges control subsystem;
Fig. 3 is the schematic diagram that primary TDM/TDMA satellite channel intelligence of the present invention exchanges control subsystem.
Embodiment
Fig. 1 shows the system realized by satellite channel intelligence switching method of the present invention: described method comprises:
Primary TDM/TDMA satellite channel intelligence is set and exchanges control subsystem;
Arrange and the multiple connection satellite channel intelligence of control information together with business multiple connection is exchanged control subsystem;
Wherein, when detecting that primary TDM/TDMA specific satellite channel intelligence exchanges control subsystem fault, multiple connection satellite channel intelligence is exchanged control subsystem and is switched to primary operating state by handover module;
Wherein, when detection primary TDM/TDMA satellite channel intelligence exchange control subsystem recovers and confirms stable after, the switching of primary TDM/TDMA satellite channel intelligence exchange control subsystem is got back to primary operating state by handover module.
As shown in Figure 1, satellite channel intelligence switching system of the present invention comprises: primary TDM/TDMA satellite channel intelligence exchanges control subsystem; The multiple connection satellite channel intelligence of control information together with business multiple connection is exchanged control subsystem; For described primary TDM/TDMA satellite channel intelligence is exchanged the handover module that one of control subsystem and multiple connection satellite channel intelligence exchange control subsystem are switched to primary operating state; Wherein, when detecting that primary TDM/TDMA specific satellite channel intelligence exchanges control subsystem fault, multiple connection satellite channel intelligence is exchanged control subsystem and is switched to primary operating state by handover module; Wherein, when detection primary TDM/TDMA satellite channel intelligence exchange control subsystem recovers and confirms stable after, the switching of primary TDM/TDMA satellite channel intelligence exchange control subsystem is got back to primary operating state by handover module.
Fig. 2 shows multiple connection satellite channel of the present invention intelligence and exchanges control subsystem, as shown in Figure 2, what multiple connection satellite channel intelligence exchanged control subsystem employing is all business device, after connecting relevant device interface, namely satellite channel intelligence exchange control system links up, the separate transmission of each far-end satellite earth station information, utilize Traffic Channel, do not need specific satellite channel.
Control information and the business information of multiple connection satellite channel intelligence exchange control subsystem share satellite business channel, thus when Traffic Channel adjusts unsuccessfully, this remote terminal can be caused temporarily not controlled.When traffic carrier switches, the solution taked of feature for multiple connection satellite channel intelligence exchange control system have following some:
A, order and send associated remote ends watch-dog to by existing multiple connection satellite channel intelligence exchange control system;
B, remote monitoring equipment utilization error correction information judge, require to resend during mistake, ensure that the order that remote monitoring equipment receives is correct;
C, remote monitoring equipment, according to order amendment remote terminal relevant devices parameter, preserve the original running parameter of equipment simultaneously;
Remote monitoring equipment fetch equipment new state after d, amendment, if Discovery Status is abnormal, then amendment before repeating, if it is still abnormal repeatedly to revise state, returns to the operating state of preserving before changing;
E, central station judge whether the equipment state that this subcommand will be revised changes, and retain former work relevant parameter simultaneously.After discovering device state changes (confirming that remote equipment parameter is successfully modified), relevant devices is set to new argument, fetch equipment new state, if Discovery Status is abnormal, amendment before then repeating, if repeatedly state is still abnormal after amendment, return to the operating state of preserving before changing;
If f system detects within a certain period of time find that new link connection is normally not open-minded, the operating state that remote terminal and central station are preserved before all automatically restoring to and changing, recovers the proper communication of control information.
Fig. 3 shows primary TDM/TDMA specific satellite channel intelligence of the present invention and exchanges control subsystem, and as shown in Figure 3, central station T completes function and is: with the station clock of central station for clock source, produces the time reference of satellite channel intelligence exchange control system; Receive data and be converted to the transmission of TDM synchrodata; Catch the TDMA carrier wave that each remote terminal is launched, synchronizing TDMA data, TDMA separate frame, are sent to central station system after format conversion.Remote terminal completes function: from the TDM carrier wave received, extraction time the clock reference that sends as remote terminal TDMA carrier wave of benchmark, realize the whole network clock synchronous of the intelligent exchange control system of TDM/TDMA satellite channel, complete TDMA framing.
Because primary TDM/TDMA specific satellite channel intelligence of the present invention exchanges control subsystem up employing TDMA mode, so satellite burst MODEM must be used.Satellite burst MODEM preferably adopts TDMA working method at a slow speed.
When TDMA working method at a slow speed, user can create self-defining packet and sufficiently long preamble, thus utilizes standard satellite MODEM to receive this packet.The length requirement of preamble guarantees to make carrier lock, as shown in table 1.Satellite MODEM happens suddenly carrier wave by RTS control transmitting/closedown.This working method is adopted based on existence conditions satellite burst MODEM.
Frame structure of the present invention makes an explanation below.
A, frame structure design principle
Time division multiple access (TDMA) mode distinguishes different address with different time-gap, and each remote terminal only transmits in bursts in regulation time slot; In time, require these signals by regulation order successively by satellite repeater, non-overlapping copies, any moment is by the signal only having a station to send of satellite repeater.Therefore, need design tdma frame structure, the control signal avoiding different website to send is overlapping on satellite repeater; And improve satellite channel intelligence exchange control system utilance, reduce transponder free time.
Consider carrier acquisition time and transmission information amount, satellite channel intelligence exchange control system carrier information speed is chosen to be 64kbps, TDM carrier wave selects QPSK modulation, FEC3/4 error correction, and TDMA carrier wave selects BPSK modulation, FEC1/2 error correction, and carrier acquisition time is 60ms at least.Initial stage network size considers 8 far-end satellite earth stations.For reducing complexity, compressed information transmission cycle, time slot allocation selects fixing preassignment mode.Design adopts stratification frame structure, and be made up of frame, framing and time slot, its least unit is time slot.
B, protection time slot are determined
During TDMA carrier operation, must have unified time reference, each website time slot must be synchronous with time reference.Central station as time reference utilizes the TDM carrier wave of transmission continuously, periodically for each remote terminal provides time reference.Timing problem is a key issue of TDMA mode work, mainly comprises the process of two aspects:
A, when starting to launch, ensure that this burst accurately falls into the time slot of specifying, and other time slots can not be strayed into cause interference;
B, each point stand in the time slot work of specifying, maintain strict time relationship between them, and the phenomenon that can not overlap.Because the radio wave propagation air line distance of each remote terminal and central station distance satellite there are differences each other.Make central station send to the TDM carrier wave of satellite, each remote terminal receives and the TDMA carrier clock benchmark extracted exists deviation each other, and the information causing each remote terminal to be sent on satellite repeater may be overlapping.The simplest method adopts protection time slot to overcome its impact exactly.Guard time is greater than 2 times of the deviate of this maximum possible.
According to nationwide satellite time delay statistical conditions, then consider certain satellite drift, clock skew, guard time should be not less than 30ms.
C, frame structure are determined
Frame length is chosen and will be considered following principal element: frame efficiency and Time Delay of Systems; Business datum segment length is the integral multiple of 8bit; The station number of the scale of network and the interior work of network, frame longer frame efficiency is higher, and open ended station number is more; Capturing carrier and Clock Extraction time.Design and divide frame period identical to TDMA carrier wave to the TDM carrier frame cycle with entering.
Capturing carrier lock in time: Ts=512 × 8/64=64 (ms) >60ms;
Guard time: Tp=252 × 8/64=31.5 (ms) >30ms;
Single remote terminal tdma frame cycle: T=(512+4+1200+252) × 8/64=246ms;
The single remote terminal one frame internal information transmission time: Ti=1200 × 8/64=150ms;
Single remote terminal tdma frame efficiency: η=Ti/T=150/246 ≈ 61%;
8 remote terminal tdma frame frame periods are: Tf=8T=1.968s.
Satellite 2 jumps maximum delay Td=540ms, then central station issues commands to and receives required maximum time: the Tmax=Tf+Td=1.968+0.54=2.5s of response.
Remote terminal and TDM/TDMA satellite channel intelligence exchange control system asynchronous serial port information transmission rate RRT elect 2.4kbps as, then remote terminal maximum amount of data: DR=RRT × (Tf+Td/2)=5.3712kb within an acknowledge cycle.
Remote terminal data launch transmission rate needed for DR data in the transmission time Ti of our station, i.e. maximum receiving velocity: RRT=RCR=DR/Ti=35.8kbps needed for JC-SAT channel intelligence exchange control system asynchronous serial port.
JC-SAT channel intelligence exchange control system asynchronous serial port receiving velocity selects asynchronous 38.4kbps standard speed; Transmission rate considers the amount of information of all remote terminals of management, and follows the consistency principle, also selects 38.4kbps; Each remote terminal receiving center station TDM continuous carrier, final asynchronous interface receiving velocity is identical with central station transmission rate is also 38.4kbps.
In addition, the present invention completes above-mentioned functions by TDM/TDMA link adapter, interface conversion, TDM and TDMA framing solution frame, data syn-chronization, exchanges data and remote terminal satellite burst Modem carrier Control between link adapter completion system and satellite channel intelligence exchange control system specific satellite burst modem (Modem).
Although be explained in detail the present invention above; but the present invention is not limited thereto; those skilled in the art can principle according to the present invention modify, and therefore, all various amendments carried out according to principle of the present invention all should be understood to fall into protection scope of the present invention.
Claims (4)
1. a satellite channel intelligence switching method, is characterized in that, comprise the following steps:
Primary TDM/TDMA satellite channel intelligence is set and exchanges control subsystem;
Arrange and the multiple connection satellite channel intelligence of control information together with business multiple connection is exchanged control subsystem;
Wherein, when detecting that primary TDM/TDMA specific satellite channel intelligence exchanges control subsystem fault, multiple connection satellite channel intelligence is exchanged control subsystem and is switched to primary operating state by handover module;
Wherein, when detection primary TDM/TDMA satellite channel intelligence exchange control subsystem recovers and confirms stable after, the switching of primary TDM/TDMA satellite channel intelligence exchange control subsystem is got back to primary operating state by handover module.
2. a satellite channel intelligence switching system, is characterized in that, comprising:
Primary TDM/TDMA satellite channel intelligence exchanges control subsystem;
The multiple connection satellite channel intelligence of control information together with business multiple connection is exchanged control subsystem;
For described primary TDM/TDMA satellite channel intelligence is exchanged the handover module that one of control subsystem and multiple connection satellite channel intelligence exchange control subsystem are switched to primary operating state;
Wherein, when detecting that primary TDM/TDMA specific satellite channel intelligence exchanges control subsystem fault, multiple connection satellite channel intelligence is exchanged control subsystem and is switched to primary operating state by handover module;
Wherein, when detection primary TDM/TDMA satellite channel intelligence exchange control subsystem recovers and confirms stable after, the switching of primary TDM/TDMA satellite channel intelligence exchange control subsystem is got back to primary operating state by handover module.
3. system according to claim 2, is characterized in that, multiple connection satellite channel intelligence exchange control system comprises central station, satellite business channel and remote terminal;
Wherein, central station system by the control command of remote terminal by multiplexer together with the miscellaneous service multiple connection to remote terminal, utilize traffic carrier to deliver to remote terminal; Remote terminal, by passing to the information of central station together with the business multiple connection at this station, utilizes traffic carrier to be sent to central station.
4. system according to claim 2, is characterized in that, primary TDM/TDMA specific satellite channel intelligence exchange control system comprises central station and remote terminal;
Wherein, central station adopts a TDM to go out continuously to channel, and all remote terminals share this channel, therefrom select the data issuing our station after reception; All remote terminals share a TDMA carrier wave as entering to channel, and each remote terminal sends information to central station at respective specific time slot.
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| CN201410243586.4A CN105281821A (en) | 2014-06-04 | 2014-06-04 | Satellite channel intelligent switching method and system |
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| CN201410243586.4A CN105281821A (en) | 2014-06-04 | 2014-06-04 | Satellite channel intelligent switching method and system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109526061A (en) * | 2018-12-28 | 2019-03-26 | 四川安迪科技实业有限公司 | A kind of channel width lossless switching method based on satellite communication |
| CN109818667A (en) * | 2018-12-26 | 2019-05-28 | 中国电子科技集团公司第二十研究所 | It is a kind of based on star upper signal channel exchange remote equipment enter network control method |
| CN111459013A (en) * | 2020-04-10 | 2020-07-28 | 中国南方电网有限责任公司超高压输电公司广州局 | Switching system of submarine cable oil pump station equipment signal |
| CN114867095A (en) * | 2022-05-18 | 2022-08-05 | 西安言集傲威信息科技有限公司 | Time slot synchronization method for TDMA/MF-TDMA satellite communication system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818667A (en) * | 2018-12-26 | 2019-05-28 | 中国电子科技集团公司第二十研究所 | It is a kind of based on star upper signal channel exchange remote equipment enter network control method |
| CN109818667B (en) * | 2018-12-26 | 2021-05-04 | 中国电子科技集团公司第二十研究所 | Remote equipment network access control method based on-satellite channel exchange |
| CN109526061A (en) * | 2018-12-28 | 2019-03-26 | 四川安迪科技实业有限公司 | A kind of channel width lossless switching method based on satellite communication |
| CN111459013A (en) * | 2020-04-10 | 2020-07-28 | 中国南方电网有限责任公司超高压输电公司广州局 | Switching system of submarine cable oil pump station equipment signal |
| CN114867095A (en) * | 2022-05-18 | 2022-08-05 | 西安言集傲威信息科技有限公司 | Time slot synchronization method for TDMA/MF-TDMA satellite communication system |
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Application publication date: 20160127 |