CN103347164A - Satellite resource real-time management method for satellite video conference - Google Patents
Satellite resource real-time management method for satellite video conference Download PDFInfo
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Abstract
Disclosed is a satellite resource real-time management method for a satellite video conference. The method includes the steps of conference establishment, frequency assignment by a satellite webmaster, MODEM adjustment, data link establishment, and presentation or selection in the video conference. Through establishment of a communication mechanism between a video conference system and the satellite webmaster, a satellite link and bandwidth can be controlled in real time according to needs of the video conference system, and therefore real-time performance and automation degrees of the video conference are improved. According to the satellite resource real-time management method for the satellite video conference, the problems that the satellite webmaster needs to be controlled manually in the video conference, misoperation can be easily caused and progress of the video conference is affected in the prior art are solved, direct communication between the video conference system and the webmaster is achieved, and automatic configuration of MODEM resources and satellite bandwidth resources is achieved.
Description
Technical field
The present invention relates to satellite communication field, particularly relate to the management method of satellite resource in a kind of satellite video meeting.
Background technology
Present increasingly mature along with communication technology of satellite, the application of the video communication of using based on satellite network is also day by day popularized.VSAT is the very little satellite communication earth station of a kind of antenna aperture, claims miniature earth station or small global station again.The VSAT system is made up of outdoor unit and indoor unit.Outdoor unit is radio-frequency apparatus, comprises small aperture antenna, goes up low-converter and various amplifier; Indoor unit is intermediate frequency and baseband equipment, comprises modulator-demodulator, coder etc., its concrete composition because of the different slightly differences of type of service.The VSAT net can be divided into data communication network, voice communication network and telstar communication network three major types according to Business Nature.At present, domestic VSAT communication service operation open to the society.The user can rent one section satellite frequency and be used for communication, and this band frequency resource is in charge of by the satellite webmaster.When the user uses satellite resource, also to notify the satellite webmaster when using this band frequency to do carrier transmit to the satellite nms application.
A kind of implementation method of the fully automatic configuration of broadband video conference broadcasting service based on earth satellite station is disclosed among the Chinese patent literature CN101674529A, it is characterized in that may further comprise the steps: at first, by main meeting-place earth satellite station operator according to the actual requirements, the interior monitoring interface of slave station starts the application of broadcasting service to network management center; Secondly, after network management center receives main meeting-place earth satellite station application, issue this time communicate by letter employed key and the needed satellite resource of communicating by letter to the relevant earth satellite station of conference participation; The 3rd, by the roll-call of network management center's startup to the relevant earth satellite station broadcasting service communications status of conference participation; The 4th, in broadcasting service was carried out, main meeting-place earth satellite station operator can be as required dynamically to network management center's application or the release processing of organizing satellite resources more.Though this patent application provides a kind of independently TV conference system,, in its technical scheme, when holding video conference, need artificial control satellite webmaster, namely need be come to the application of satellite network tube hub by the operator of main meeting-place, and then carry out foundation and the dismounting of link.Like this, in the process of video conference, Artificial Control satellite webmaster has not only increased manually operated workload, also easily owing to the artificial misoperation of controlling produces mistake, has influenced the progress of video conference.
Summary of the invention
For this reason, the technical problem to be solved in the present invention is that the satellite video conference needs artificial control satellite webmaster in the prior art, be easy to generate misoperation, influence the problem of video conference progress, thereby the real-time management method of a kind of video conferencing system with the video conference satellite resource of the automatic configuration of webmaster direct communication, realization MODEM resource and satellite bandwidth resource is provided.
For solving the problems of the technologies described above, the invention provides a kind of real-time management method of video conference satellite resource: may further comprise the steps:
(1) conference creation: the video conferencing system controller is initiated request for conference to satellite webmaster demand frequency;
(2) satellite webmaster dividing frequency: the satellite webmaster is received conference creation application request, applies for that successfully the described satellite webmaster in back is distributed to the required frequency bandwidth of described video conferencing system controller;
(3) adjust MODEM and set up the satellite data link: the video conferencing system controller is received the frequency bandwidth that described meeting is required, begin to dial modem, the transmission frequency of the MODEM of a local described free time is set, and the receive frequency of the MODEM of all end side and this described transmission frequency are arranged consistent, set up by the one way data communication link of described video conference controller to described terminal; MCU is connected with a plurality of MODEM, is responsible for uploading, send or receiving of each remote point, and terminal of remote point is provided with a corresponding MODEM;
(4) speech or choosing in the video conference process are seen: in the video conference process, when needing to select speech or choosing to see terminal, described video conferencing system controller arranges the transmission frequency of the MODEM of idle receive frequency and far-end of a local MODEM consistent, described video conferencing system controller notifies described this speech or choosing to see the terminal transmits information code stream, and described video conferencing system controller sends to all participant terminals with described code stream.
Receive the request for conference of described video conferencing system controller initiation at satellite webmaster described in the step (1) after, described satellite webmaster gives corresponding answer according to current satellite frequency operating position, if can't satisfy the request of required frequency, then refuse this application, otherwise continue to reply request for conference, distribute corresponding frequencies, finish meeting; Described video conferencing system controller is enabled broadcast band after obtaining frequency resource from described satellite webmaster immediately, and in whole conference process, described broadcast band can not be closed, and can not reconfigure yet, and no longer needs additional management; In conference process, when enabling the passback frequency range or sending non-broadcasting code stream, described video conferencing system controller, is then enabled if the free time is arranged to the operating position of the corresponding passback of satellite webmaster inquiry frequency range.
Be used for managing video meeting and the required frequency resource of other Satellite Communication Systems at the satellite network pipe described in described (2) step.
Comprise broadcast band and passback frequency range in the required frequency bandwidth of video conferencing system controller described in described (2) step, described broadcast band is used for voice messaging code stream, audio mixing information code current, the signaling of broadcast terminal speech; Described passback frequency range is used for uploading with mutual election mutually of terminal code stream and sees.
The form of described passback frequency range comprises: nominative formula, auxilliary form, second code check; The nominative formula is used for the high definition passback, and auxilliary form is used for the SD passback, and two groups of passback frequency ranges can be applied for simultaneously.
Support a plurality of described MODEM at video conferencing system controller described in the step (3), in specific array, each described MODEM has the respective identification sign indicating number to each described MODEM operating position by respective record; The data of each described specific storage of array comprise three aspects: send the end points operating position, receive the end points operating position, the connection situation, described specific array record meeting Id, described this Id is for judging whether just in use sign of this sending/receiving end points, when if meeting need be used a sending/receiving MODEM, described video conferencing system controller is inquired about whole array, find the serial server of respective free MODEM correspondence that described MODEM is set, and record corresponding information, when discharging the MODEM resource, described video conferencing system controller empties corresponding information.
When setting the every relevant parameter of MODEM in step (3), (4), described video conferencing system controller uses serial server by data satellite link control MODEM, and described serial server is corresponding one by one with MODEM.
The operation of described group of MODEM in step (3), (4) also comprises following content:
1.1) registration, the main business of described MCU starts the back to the MODEM initiation registration of MCU side.Carry IP and the corresponding port of the serial server of this MODEM correspondence in the MODEM log-on message of MCU, this information of MODEM management module records, and answer " affirmation ".MCU receives that " affirmation " back is set to connect at the corresponding MODEM of database, and then this piece MODEM just can use.
1.2) bandwidth is set, described video conferencing system controller arrange in the bandwidth messages in comprise bandwidth and the type that will arrange;
1.3) send, described transmit operation is used for the transmission frequency of described MODEM is set, and described MODEM is set enters the transmission state;
1.4) stop to send, describedly stop transmit operation and be used for MODEM and be set to default frequency, and stop carrier wave and send;
1.5) receive, described reception operation has to arrange and receives frequency, revises and receive frequency, begin the function that receives, stop to receive, described reception message carries frequency point information, if value of frequency point is 0, then will receive frequency and become default value, and stop to receive, otherwise, revise receiving value of frequency point, continue to receive.
1.6) remove, described releasing operation will stop the transmission of MODEM instruction and data, and parameter resetting is resetted.
Set up up (transmission) passage operating in of described in step (3), (4) groups of MODEM, remove data feedback channel, set up descending (reception) passage, remove in the process of down going channel.
In described step (2) and step (3), described video conferencing system controller according to the required broadcast band of the required calculating of meeting and passback frequency range, and to the satellite nms application, discharges the resource of frequency range when meeting adjourned before conference creation.
Technique scheme of the present invention has the following advantages compared to existing technology:
1. the satellite resource real-time management method in the satellite video meeting of the present invention, may further comprise the steps: conference creation, satellite webmaster dividing frequency, adjust MODEM and set up the satellite data link, speech or choosing in the video conference process are seen, set up communication mechanism by video conferencing system and satellite webmaster, can control satellite link and bandwidth in real time according to the needs of video conferencing system, real-time and the automation of video conference have been improved, no longer need artificially to control foundation and the dismounting that network management system is finished link, can realize initiating the conference creation request automatically by the conference system controller.Solve satellite video meeting of the prior art and needed artificial control satellite webmaster, be easy to generate misoperation, influence the technical problem of video conference progress, the real-time management method of video conference satellite resource of the automatic configuration of a kind of video conferencing system and webmaster direct communication, realization MODEM resource and satellite bandwidth resource is provided.
2. the satellite resource real-time management method in the satellite video meeting of the present invention, the satellite webmaster distributes the required frequency of meeting as required automatically, realizes the bandwidth resources of satellite link are moved dynamic assignment, has improved operating efficiency.
3. the satellite resource real-time management method in the satellite video meeting of the present invention, video conferencing system controller (MCU) can be realized the management to the MODEM resource automatically, MCU dials corresponding MODEM automatically, sets up data link, has realized automated communications.In addition, can select high definition passback and/or SD passback according to the needs of video conference to image quality.Simultaneously, MCU supports a plurality of MODEM, records the use information of each MODEM simultaneously, makes things convenient for the MCU inquiry.
4. the satellite resource real-time management method in the satellite video meeting of the present invention, realize the operation of the MODEM of MCU by serial server, in addition, the operating function of dialling MODEM is perfect, can revise a plurality of parameter informations, MCU can discharge resource of frequency range closing session automatically in that meeting adjourned, has realized obtaining automatically and discharging of the automation of meeting and communication port.
Description of drawings
Content of the present invention is easier clearly to be understood in order to make, and below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein:
Fig. 1 is the flow chart of the satellite resource real-time management method in the satellite video meeting of the present invention.
Embodiment
Technical scheme of the present invention provides the satellite resource real-time management method in a kind of satellite video meeting, and this management method may further comprise the steps:
(1) conference creation,
(2) satellite webmaster dividing frequency,
(3) adjust MODEM and set up the satellite data link,
(4) speech/choosing is seen.
In step (1), at first, video conferencing system is initiated request for conference to described satellite webmaster demand frequency, and described satellite webmaster is the management software of mainly being responsible for the satellite frequency resource, so be referred to as the satellite webmaster.
In the step (2), described satellite webmaster is received the frequency application that video conferencing system is sent, and inquires about current frequency operating position, and gives the answer of satellite video conference system.The needed satellite frequency of each video conference comprises broadcast band and passback frequency range; Broadcasting frequency is used for broadcasting spokesman code stream, audio mixing code stream, signaling etc.; The passback frequency range is used for that the terminal code stream is uploaded, the phase mutual election is seen.When needing to create meeting, video conferencing system is according to the required bandwidth that calculates required broadcast band and passback frequency range of meeting, and to the satellite nms application, the satellite webmaster distributes respective bandwidth, and broadcast band is not closed namely enabling in whole conference process after the acquisition.When meeting adjourned, video conferencing system discharged broadcast band and passback frequency range.
A video conferencing system needs a broadcast band, the computing formula of described broadcast band: Bbrd=(Rmv+Rsv+ (N+1) * Ra) * 1024.Rmv is the primary key rate of meeting, and its value is for being also referred to as central point at MCU(video conferencing system controller) code check (this code check is arranged with network environment as required by the user) that arranges of lining deducts the code check of audio frequency.Rsv is second code check of meeting, is generally 512.Ra is the audio code rate of meeting, and according to different audio formats, its value is generally 48 or 64.N is the port number of mixer, and its value depends on the audio mixing ability of mixer and the passback way that meeting is supported, gets the smaller value of the two.
Return path is divided into many groups according to different-format, and every group can have a plurality of.Usually as required to three groups of described satellite nms application nominative formulas, auxilliary form, second code check.
Wherein, the quantity of nominative formula and auxilliary form frequency range is by the meeting template setting that is pre-configured in the described MCU.Can apply for nominative formula (being used for the high definition passback), two groups of passback frequency ranges of auxilliary form (being used for the SD passback) simultaneously.
Video conferencing system receives that frequency restoration is kept at information in the corresponding structure of described MCU.
In step (3), (4), video conferencing system is supported the MODEM(modulator-demodulator of a plurality of diplex operation modes).MCU is connected with a plurality of MODEM, is responsible for uploading and receiving of each remote point, and terminal of remote point has a MODEM.The operating position of each MODEM is recorded in the corresponding MODEM array of data of video conference.Each MODEM has corresponding sign (MODEMID), and MODEM array of data structure comprises three parts: 1. send the end points operating position, 2. receive the end points operating position, 3. data connect situation.In the MODEM array of data, there is corresponding data record MODEM to send the meeting identification (ID) of end points, these data are whether just in use signs of this MODEM, if this data value is 0 then this MODEM of explanation is in idle condition.When video conference needs a MODEM as the transmission end points, video conferencing system is consulted the MODEM array of data, meeting identification (ID) data value of searching MODEM transmission end points is 0 MODEM, dial MODEM according to the corresponding serial server of MODEMID coupling then, and with frequency, frequency, use information record, when meeting adjourned recorded information is emptied.To the management of the MODEM of the receiving terminal MODEM unanimity with transmitting terminal.
MODEM sets up in the satellite data link step in adjustment, " group MODEM " be the parameters of setting MODEM, start transmission, reception etc., it is the interface of MODEM that the user uses.By providing serial ports to receive every order of dialling MODEM.Video conferencing system is finished by serial server link (LinkStar) control via satellite MODEM and is dialled the MODEM operation.Wherein, serial server is corresponding one by one with MODEM, and the Ethernet interface of serial server inserts the network environment of video conferencing system, and the serial ports of serial server connects the serial ports of MODEM, adopts MODEM session to manage serial server in the present invention.
The MODEM operation of dialling in step (3), (4) also comprises concrete following steps:
2.1) registration (Regist), the main business of described MCU starts the back to the MODEM initiation registration of MCU side.Carry IP and the corresponding port value information of the serial server of this MODEM correspondence in the MODEM log-on message of MCU, this information of MODEM management module records, and answer " affirmation ".MCU receives that " affirmation " back is set to connect at the corresponding MODEM of database, and then this piece MODEM just can use.
2.2) bandwidth (SetBitRate) is set, described video conferencing system controller arrange in the bandwidth messages in comprise bandwidth and the type that will arrange;
2.3) sending (send), described transmit operation is used for the transmission frequency of described MODEM is set, and described MODEM is set enters the transmission state;
2.4) stop to send (StopSend), describedly stop transmit operation and be used for MODEM and be set to default frequency, and stop carrier wave and send;
2.5) reception (Receive), described reception operation has to arrange and receives frequency, revises and receive frequency, begin the function that receives, stop to receive, described reception message is carried frequency point information, if value of frequency point is 0, then will receive frequency and become default value, and stop to receive, otherwise, revise receiving frequency, continue to receive.
2.6) remove (Release), described releasing operation stops the transmission of MODEM instruction and data, and parameter resetting is resetted.
Operating in of described group of MODEM in step (3), (4) set up data feedback channel, removes data feedback channel, sets up down going channel, removed in the process of down going channel.
Wherein, set up data feedback channel and carry out when notice terminal (MT) begins to send code stream, be embodied in " NotifyMTSend " module of described MCU, this module is used for the notice terminal and begins to send code stream and stop to send code stream.At first according to the code rate selection frequency range of MT, select an idle MODEM of reception in the video conferencing system side then, it is locked on the identical frequency and frequency band with the transmission MODEM of MT side.
Remove data feedback channel and be in notice and carry out when MT stops to send code stream, specifically be embodied in equally in " NotifyMTSend " module.Stop the transmission MODEM of MT side and the reception MODEM operating state of video conferencing system side gets final product by the order of dialling MODEM, at this time up link is removed.The reception MODEM resource of video conferencing system side is released.
Set up down going channel and carry out when setting up descending exchange, be embodied in " ProcMODEMAtSwitchSrcToDst " module of described MCU, this module is used for code stream is distributed to the participant terminal.At first MCU selects idle transmission MODEM in the MCU side then according to the code rate selection frequency range that sends code stream, and it is locked on the identical frequency and frequency band with the reception MODEM of MT side, has so just set up down link.
There is a kind of situation to pay particular attention in described descending process, issue N(N if code stream will be both〉1) individual MT, though set up N bar down link, but the transmission MODEM of video conferencing system side has only one, this has benefited from " m_atSatSelAddrInfo " variable among the described MCU, and (this variable is in MCU, being used for record MODEM operating position) choosing of lining record sees that the source of MODEM realizes, be that same choosing sees that the source only uses one to send MODEM, even down going channel (exchange) may have many.
In existing session logic, setting up down going channel all is to see because sent the terminal choosing, stopping to realize when choosing is seen that be embodied in " ProcMODEMAtStopSelect " module of described MCU, this module is used for stopping one tunnel choosing and sees so remove down going channel.The reception MODEM of MT end is bound to cut off, and whether the transmission MODEM of MCU side discharges, and depends on whether to also have other MT at the code stream that receives it.
The dismounting down going channel is here realized and is unreasonable, selects module because " ProcMODEMAtStopSelect " module among the described MCU is an operation, is used for stopping one tunnel MODEM that responds and stop to respond, but not logic module.Here not makeing mistakes is because have only choosing to see that this service needed sets up descending exchange at present, just may go wrong when occurring new business demand later on.
Obviously, above-described embodiment only is for example clearly is described, and is not the restriction to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all execution modes exhaustive.And the apparent variation of being extended out thus or change still are among the protection range of the invention.
Claims (10)
1. the satellite resource real-time management method in the satellite video meeting is characterized in that, may further comprise the steps:
(1) conference creation: the video conferencing system controller is initiated request for conference to satellite webmaster demand frequency;
(2) satellite webmaster dividing frequency: the satellite webmaster is received conference creation application request, applies for that successfully the described satellite webmaster in back is distributed to the required frequency bandwidth of described video conferencing system controller;
(3) adjust MODEM and set up the satellite data link: the video conferencing system controller is received the frequency bandwidth that described meeting is required, begin to dial modem, the transmission frequency of the MODEM of a local described free time is set, and the receive frequency of the MODEM of all end side and this described transmission frequency are arranged consistent, set up by the one way data communication link of described video conference controller to described terminal; Described video conference controller is MCU, and described MCU is connected with a plurality of MODEM, is responsible for uploading, send or receiving of each remote point, and terminal of remote point is provided with a corresponding MODEM;
(4) speech or choosing in the video conference process are seen: in the video conference process, when needing to select speech or choosing to see terminal, described video conferencing system controller arranges the transmission frequency of the MODEM of idle receive frequency and far-end of a local MODEM consistent, described video conferencing system controller notifies described this speech or choosing to see the terminal transmits information code stream, and described video conferencing system controller sends to all participant terminals with described code stream.
2. the satellite resource real-time management method in the satellite video meeting according to claim 1, it is characterized in that: receive the request for conference of described video conferencing system controller initiation at satellite webmaster described in the step (1) after, described satellite webmaster gives corresponding answer according to current satellite frequency operating position, if can't satisfy the request of required frequency, then refuse this application, otherwise continue to reply request for conference, distribute corresponding frequencies, finish meeting; Described video conferencing system controller is enabled broadcast band after obtaining frequency resource from described satellite webmaster immediately, and in whole conference process, described broadcast band can not be closed, and can not reconfigure yet, and no longer needs additional management; In conference process, when enabling the passback frequency range or sending non-broadcasting code stream, described video conferencing system controller, is then enabled if the free time is arranged to the operating position of the corresponding passback of satellite webmaster inquiry frequency range.
3. according to the satellite resource real-time management method in any described satellite video meeting of claim 1-2, it is characterized in that, be used for managing video meeting and the required frequency resource of other Satellite Communication Systems at the satellite network pipe described in described (2) step.
4. according to the satellite resource real-time management method in any described satellite video meeting of claim 1-3, it is characterized in that, comprise broadcast band and passback frequency range in the required frequency bandwidth of video conferencing system controller described in described (2) step, described broadcast band is used for voice messaging code stream, audio mixing information code current, the signaling of broadcast terminal speech; Described passback frequency range is used for uploading with mutual election mutually of terminal code stream and sees.
5. according to the satellite resource real-time management method in any described satellite video meeting of claim 1-4, it is characterized in that the form of described passback frequency range comprises: nominative formula, auxilliary form, second code check; The nominative formula is used for the high definition passback, and auxilliary form is used for the SD passback, and two groups of passback frequency ranges can be applied for simultaneously.
6. according to the satellite resource real-time management method in any described satellite video meeting of claim 1-5, it is characterized in that, support a plurality of described MODEM at video conferencing system controller described in the step (3), in specific array, each described MODEM has the respective identification sign indicating number to each described MODEM operating position by respective record; The data of each described specific storage of array comprise three aspects: send the end points operating position, receive the end points operating position, the connection situation, described specific array record meeting Id, described this Id is for judging whether just in use sign of this sending/receiving end points, when if meeting need be used a sending/receiving MODEM, described video conferencing system controller is inquired about whole array, find the serial server of respective free MODEM correspondence that described MODEM is set, and record corresponding information, when discharging the MODEM resource, described video conferencing system controller empties corresponding information.
7. according to the satellite resource real-time management method in any described satellite video meeting of claim 1-6, it is characterized in that, when in step (3), (4), setting the every relevant parameter of MODEM, described video conferencing system controller uses serial server by data satellite link control MODEM, and described serial server is corresponding one by one with MODEM.
8. according to the satellite resource real-time management method in any described satellite video meeting of claim 1-7, it is characterized in that: the operation of described group of MODEM in step (3), (4) also comprises following content:
8.1) registration, the main business of described MCU starts the back to the MODEM initiation registration of MCU side, carry IP and the corresponding port of the serial server of this MODEM correspondence in the MODEM log-on message of MCU, this information of MODEM management module records, and answer " affirmation ", MCU receives that " affirmation " back is set to connect at the corresponding MODEM of database, and then this piece MODEM just can use;
8.2) bandwidth is set, described video conferencing system controller arrange in the bandwidth messages in comprise bandwidth and the type that will arrange;
8.3) send, described transmit operation is used for the transmission frequency of described MODEM is set, and described MODEM is set enters the transmission state;
8.4) stop to send, describedly stop transmit operation and be used for MODEM and be set to default frequency, and stop carrier wave and send;
8.5) receive, described reception operation has to arrange and receives frequency, revises and receive frequency, begin the function that receives, stop to receive, described reception message carries frequency point information, if value of frequency point is 0, then will receive frequency and become default value, and stop to receive, otherwise, revise receiving value of frequency point, continue to receive.
8.6) remove, described releasing operation will stop the transmission of MODEM instruction and data, and parameter resetting is resetted.
9. according to the satellite resource real-time management method in any described a kind of satellite video meeting of claim 1-8, it is characterized in that, set up up sendaisle operating in of described in step (3), (4) groups of MODEM, remove data feedback channel, set up descending receive path, remove in the process of down going channel.
10. according to the satellite resource real-time management method in any described a kind of satellite video meeting of claim 1-9, in described step (2) and step (3), described video conferencing system controller before conference creation according to the required broadcast band of the required calculating of meeting and the passback frequency range, and to the satellite nms application, discharge the resource of frequency range when meeting adjourned.
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| CN106789299A (en) * | 2016-12-29 | 2017-05-31 | 电信科学技术第研究所 | A kind of satellite remote station management system |
| CN111526433A (en) * | 2020-07-02 | 2020-08-11 | 南京凯瑞得信息科技有限公司 | Satellite communication end station roll call method |
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| CN101986619A (en) * | 2010-10-29 | 2011-03-16 | 南京丹奥科技有限公司 | Bandwidth reservation-based VSAT satellite communication system bandwidth distribution method |
| CN102883374A (en) * | 2012-10-15 | 2013-01-16 | 航天恒星科技有限公司 | Resource distribution method for satellite communication system |
| CN102891980A (en) * | 2012-11-01 | 2013-01-23 | 中国电子科技集团公司第五十四研究所 | Route allocation method of satellite IP (Internet Protocol) video conference system |
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| CN106789299A (en) * | 2016-12-29 | 2017-05-31 | 电信科学技术第研究所 | A kind of satellite remote station management system |
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| CN111526433A (en) * | 2020-07-02 | 2020-08-11 | 南京凯瑞得信息科技有限公司 | Satellite communication end station roll call method |
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