CN111835394B - Multi-ground-station cooperative satellite channel attenuation resisting system and method - Google Patents
Multi-ground-station cooperative satellite channel attenuation resisting system and method Download PDFInfo
- Publication number
- CN111835394B CN111835394B CN202010486510.XA CN202010486510A CN111835394B CN 111835394 B CN111835394 B CN 111835394B CN 202010486510 A CN202010486510 A CN 202010486510A CN 111835394 B CN111835394 B CN 111835394B
- Authority
- CN
- China
- Prior art keywords
- satellite
- ground
- data
- receiving
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18517—Transmission equipment in earth stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
Abstract
The embodiment of the invention provides a multi-ground station cooperative satellite channel attenuation resisting system and a method thereof, wherein the system comprises an adaptive modulation and coding device, a satellite software defined network controller and a ground station software defined network controller, and can adaptively change the channel attenuation resisting capability and control the network routing of a satellite and a ground station; judging the current channel attenuation according to a feed link of the satellite adaptive modulation and coding device, and automatically selecting a modulation and coding mode; changing a modulation coding mode, reducing the channel capacity to keep link connection under the condition of a severe channel, and preferentially ensuring the transmission of high-priority service data; the controller changes part of low priority data flow routes and forwards the low priority data flow routes to the ground station with better channel condition; and the ground controller adjusts the ground network routing table and forwards the data to the destination station through the ground backbone network. By applying the scheme provided by the embodiment of the invention, the atmospheric channel attenuation resistance and the service data guarantee resistance of the satellite communication system can be enhanced.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a multi-ground-station cooperative satellite channel attenuation resisting system and method.
Technical Field
The combination of the self-adaptive code modulation and the multi-site cooperation method is an effective method for overcoming satellite-ground channel attenuation of a satellite communication system. By introducing a software defined network technology, the satellite network and the ground station network are interconnected and intercommunicated, the satellite-ground heterogeneous network fusion is realized, and a routing strategy with stronger flexibility, more stable communication quality and more efficient service delivery are supported.
The adaptive modulation and coding technology can utilize the radio frequency resource of the satellite channel to the maximum extent on the premise of maximizing the channel capacity. Under extreme weather conditions, the adaptive modulation and coding scheme can enable the communication of the system not to be interrupted, but can greatly reduce the throughput of the system, thereby causing network congestion. Therefore, in combination with the multi-site cooperation method, the ground stations with good channel conditions are used for receiving part of the low-priority service data, and then the low-priority service data are forwarded to the destination node through the wired network among the ground stations. The scheme of the invention can increase the capability of the satellite communication system for resisting extreme weather under the condition of ensuring the requirements of service data with different priorities.
Disclosure of Invention
The embodiment of the invention aims to provide a multi-ground-station cooperative satellite channel attenuation resisting system and method so as to resist satellite-ground channel fading and improve system data transmission capacity. The specific technical scheme is as follows:
in one aspect of the present invention, there is provided a multi-ground-station cooperative satellite channel attenuation resisting system, including: adaptive modulation and coding device, satellite software defined network control system, ground station software defined network control system, in which,
the adaptive coding control device is used for acquiring channel fading of a satellite and a ground station, automatically selecting a modulation coding mode meeting the requirement of the system error rate, sending the selected modulation coding mode to the ground station user transmitting and receiving device, and ensuring communication under the condition of meeting the requirement of the system error rate;
the satellite software defined network control system is used for acquiring satellite-ground channel bandwidth capacity, load data volume required by the system and service priority, forwarding data through the satellite-ground link according to the data service priority order, changing the route of the residual data, and forwarding the data which cannot be accommodated by the channel to the rest ground stations with the residual bandwidth;
and the ground station software defined network control system is used for acquiring the routing topology among the ground stations and receiving a residual data routing table, and forwarding the data stream after the routing is changed to the destination station by the ground network according to the destination node of the data stream.
Optionally, the adaptive modulation and coding apparatus includes: an ACM mode selector, a code modulator, a satellite terminal comprehensive demodulator, wherein,
the ACM mode selector is used for receiving a return channel signal, selecting the optimal MODCOD and sending the MODCOD to the code modulator;
the code modulator is used for receiving the MODCOD and the data source sent by the ACM mode selector and modulating data into a laser emission signal according to the MODCOD code;
the satellite terminal comprehensive demodulator is used for receiving laser signals sent by a ground station, comprehensively demodulating the signals, including clock synchronization, frame synchronization and carrier synchronization, estimating the signal-to-noise ratio of the signals, selecting MODCOD according to the signal-to-noise ratio estimated value, and sending the selected MODCOD to a ground user.
Optionally, the satellite software-defined network control system includes: a satellite-borne SDN controller, an on-board optical switch, wherein,
the satellite-borne SDN controller is used for receiving satellite software and hardware resource information, estimating satellite-to-ground link bandwidth capacity according to MODCOD selected by the ACM mode selector, analyzing bandwidth and service priority required by service data, forwarding high-priority service data according to an original route, changing a route of low-priority data exceeding the current satellite channel capacity, and updating a route flow table of the on-board optical switch;
the on-board optical switch is used for receiving a routing flow table sent by the satellite-borne SDN controller and forwarding data according to the flow table.
Optionally, the ground station software-defined network control system includes: an SDN controller, an optical switch, a fiber link, wherein,
the SDN controller is used for receiving software and hardware information in a ground network, abstracting network, cache and computing resources into a resource pool according to the software and hardware information, and dynamically allocating the resources according to the requirements of users;
the optical switch is used for forwarding data flow received by the ground station from a satellite, receiving control information and a flow table sent by the SDN controller, and forwarding the data flow to a destination node according to the flow table.
Optionally, the system further includes: a ground control center, wherein,
the ground control center is used for receiving information of the satellite software definition control system and the ground software definition control system, monitoring the satellite and the ground network, calculating the channel capacity and the occupation situation of all ground stations, and sending the information to the satellite software definition system.
Optionally, the system further includes: geosynchronous orbit satellites and low orbit satellites, wherein,
the geosynchronous orbit satellite is used for deploying a satellite SDN controller, collecting satellite network information, managing a satellite network according to the network information and a preset management strategy and sending control information to other low-orbit satellites;
and the low orbit satellite is used for receiving the data access request of the ground station and the control information, and receiving and forwarding the data sent by the ground station according to the control information.
Optionally, the system further includes: an active ground station and a standby ground station, wherein,
the active ground station is used for receiving satellite transmission data and forwarding the received data to a destination node through a ground software defined network;
and the standby ground station is used for receiving the control information of the satellite software defined controller and assisting the active ground station with serious satellite-ground channel attenuation to transmit part or all of the data.
In another aspect of the present invention, there is also provided a radio frequency signal generating method, including:
receiving signals transmitted to a satellite by a ground station;
comprehensively demodulating the signals, and estimating the signal-to-noise ratio of the signals in real time;
transmitting the data back to the ground station, and selecting an optimal modulation coding mode by utilizing the signal-to-noise ratio of the estimated signal;
according to the selected modulation coding scheme, carrying out coding modulation on the service data and forwarding the service data to the satellite node;
and repeating the process, estimating the signal-to-noise ratio of the signal in real time, and updating the used modulation coding scheme.
In another aspect of the present invention, there is also provided a multi-site assistance method, including:
acquiring network data load information including data destination nodes, priority, data volume and the like;
calculating the current satellite-ground channel capacity, and preferentially forwarding high-priority service data;
inquiring available cooperative site channel residual capacity information, changing inter-satellite routing of low-priority service data, and forwarding to a cooperative site through a cooperative site satellite-ground link;
and transmitting the assistance forwarding data to the destination node by using a wired network between the ground stations.
The multi-ground-station cooperative satellite channel attenuation resisting system and method provided by the embodiment of the invention can estimate the signal-to-noise ratio of satellite-ground channel signals in real time; selecting a proper modulation coding scheme according to the estimated signal-to-noise ratio, and synchronously using the modulation coding scheme by the ground station and the satellite; acquiring load information of data to be forwarded by the channel, calculating channel capacity according to a modulation coding scheme, and searching available cooperative stations through a controller if overload exceeds the channel capacity adopting the current modulation coding scheme; the channel transmits the high priority service data preferentially; changing the route between the rest data satellites, and receiving data through the cooperative ground station; the low priority data is forwarded to the destination node via a wired link between the ground stations. By applying the scheme provided by the embodiment of the invention, the satellite-ground channel condition can be detected in real time, and the optimal modulation coding scheme meeting the service QoS requirement is selected according to the current situation; when the channel capacity is seriously faded, a multi-site cooperation scheme can be adopted, the inter-satellite route is changed, the rest low-priority load data is shunted and forwarded to the cooperation ground sites, and then the rest low-priority load data is sent to a target node through the inter-ground site network, so that the QoS and time delay requirements of high-priority data services are ensured, and the whole data transmission capacity of the system is also ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a multi-ground-station cooperative satellite channel fading resisting system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a satellite adaptive coded modulation system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a cooperative multi-ground-station satellite channel fading resisting system according to an embodiment of the present invention, and is also an abstract drawing;
fig. 4 is a flowchart of a system for resisting satellite channel fading through cooperation of multiple ground stations according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a multi-ground-station cooperative satellite channel fading resisting system according to an embodiment of the present invention is shown, where the system includes: an adaptive modulation and coding apparatus 100, a satellite software-defined network control apparatus 200, a ground station software-defined network control apparatus 300, wherein,
the adaptive coding control device 100 is configured to acquire channel fading of a satellite and a ground station, automatically select a modulation and coding mode meeting the system bit error rate requirement, send the selected modulation and coding mode to a ground station user transmitting and receiving device, send data to a satellite network where the satellite software-defined network control device 200 is located under the condition that the system bit error rate requirement is met, forward the data to the ground station software-defined network control device 300, and finally send the data to a destination node.
The satellite software-defined network control device 200 is configured to obtain bandwidth capacity of a satellite-ground channel, load data amount required by the system, and service priority, forward data through the satellite-ground link according to the data service priority order, change remaining data routes, and forward data that cannot be accommodated by the channel to the ground station software-defined network control device 300 of the remaining ground stations with the remaining bandwidth.
The ground station software-defined network control device 300 is configured to obtain a routing topology between ground stations and receive a remaining data routing table, and forward the data stream after the routing is changed to a destination station by the ground network according to a node of the data stream.
The Adaptive Code Modulation (ACM) mode is a means for maximizing the utilization of the radio frequency resources of the satellite channel on the premise of maximizing the channel capacity. Under extreme meteorological conditions, the ACM scheme can enable communication of the system to be uninterrupted, but greatly reduces system throughput and causes network congestion, so that a multi-site assistance strategy is required to forward residual data, and the data management capability of the communication system is improved.
Referring to fig. 2, which shows a schematic structural diagram of a satellite adaptive coding control apparatus 100 according to an embodiment of the present invention, the adaptive coding control apparatus 100 may include: a modulation code selector 101, a code modulator 102, a satellite terminal comprehensive demodulator 103, a channel estimation 104, wherein,
the modulation code selector 101 is configured to receive a channel signal returned by the channel estimation 104, select an optimal MODCOD, and send the MODCOD to the code modulator 102;
and the code modulator 102 is configured to receive the modulation and coding format sent by the ACM mode selector, modulate data into a laser emission signal according to the data source code, and send the laser emission signal to the comprehensive demodulator 103 at the satellite receiving end via the satellite-to-ground channel.
The satellite terminal comprehensive demodulator 103 is used for receiving the laser signal sent by the ground station, comprehensively demodulating the signal, including clock synchronization, frame synchronization and carrier synchronization, and performing channel estimation 104 on the signal.
And estimating the signal-to-noise ratio of the signal, selecting a modulation and demodulation scheme according to the signal-to-noise ratio estimation value, and sending the selected modulation and demodulation scheme to a ground user.
In one implementation, after the adaptive modulation and coding eliminates 6 modulation and coding schemes with lower efficiency from 28 modulation and coding schemes in the DVB-S2 system, the E-level basis is adopteds/N0The interval mode is selected to be 8, and the selection range of the modulation and coding schemes is { QPSK 1/4, QPSK 3/5, QPSK5/6, 8PSK 2/3, 16APSK 2/3, 16APSK 4/5, 32APSK 3/4 and 32APSK 9/10 }.
In an implementation manner of the embodiment of the present invention, the satellite software defined network control system 200 includes: a satellite-borne SDN controller, an on-board optical switch, wherein,
and the satellite-borne SDN controller is used for receiving satellite software and hardware resource information, estimating satellite-to-ground link bandwidth capacity according to the MODCOD selected by the ACM mode selector, analyzing bandwidth and service priority required by service data, forwarding high-priority service data according to the original route, changing the route of low-priority data exceeding the current satellite channel capacity, and updating the route flow table of the on-board optical switch.
And the on-board optical switch is used for receiving the routing flow table sent by the on-board SDN controller and forwarding data according to the flow table.
In an implementation manner of the embodiment of the present invention, the ground software defined network control system 300 includes: an SDN controller, an optical switch, a fiber link, wherein,
and the SDN controller is used for receiving software and hardware information in the ground network, abstracting network, cache and computing resources into a resource pool according to the software and hardware information, and dynamically allocating the resources according to the requirements of users.
And the optical switch is used for forwarding the data flow from the satellite received by the ground station, receiving the control information and the flow table sent by the SDN controller, and forwarding the data flow to the destination node according to the flow table.
In an implementation manner of the embodiment of the present invention, the system further includes: a ground control center, a geosynchronous orbit satellite, a low orbit satellite, a ground station, wherein,
and the ground control center is used for receiving information of the satellite software definition control system and the ground software definition control system, monitoring the satellite and the ground network, calculating the channel capacity and the occupation situation of all ground stations, and sending the information to the satellite software definition system.
The geosynchronous orbit satellite is used for deploying a satellite SDN controller, collecting satellite network information, managing a satellite network according to the network information and a preset management strategy and sending control information to other low-orbit satellites.
And the low-orbit satellite is used for receiving the data access request of the ground station and the control information, and receiving and forwarding the data sent by the ground station according to the control information.
The ground stations are divided into active ground stations and standby ground stations, and the active ground stations are used for receiving satellite transmission data and forwarding the received data to a target node through a ground software defined network; and the standby ground station is used for receiving the control information of the satellite software defined controller and assisting the active ground station with serious satellite-ground channel attenuation to forward part or all of the data.
Referring to fig. 3, a schematic structural diagram of a multi-ground-station cooperative satellite channel fading resisting system according to an embodiment of the present invention is shown, where the system includes:
the data source comprises: a satellite terminal 401, an original data route 402, and an assisted forwarding data route 403;
a satellite software defined network 420 comprising: low orbit satellites 421 and 422, a satellite software defined network control system 200;
a ground software defined network 430 comprising: ground stations 431 and 432, ground control management center 433, and ground network SDN controller 434.
In a scene, the satellite terminal 401 is a data transmission source and transmits the data to the low-orbit satellite 421, the low-orbit satellite 422 and the ground station 431 are provided with the adaptive modulation and coding device 100, and a modulation and coding scheme suitable for current channel fading is automatically selected. Meanwhile, the satellite software defined network control system 200 of the satellite communication network composed of the low- orbit satellites 421 and 422, and the like acquires network data load information including data destination nodes, priority, data volume and the like, and estimates the upper limit L of the link capacity of the link after the link uses the selected modulation coding schememAnd detecting the length L of the data waiting to be forwarded in the link, comparing the relation between the length of the data waiting and the upper limit of the link capacity, and taking corresponding measures.
When L ism>When L, the data route is not changed; when L is>LmThen, calculating the residual link capacity L of all ground stationsnMatching the remaining data to be forwarded with the collaboration site, and changing the data to exceed the upper limit LmThe inter-satellite route of the low-priority data is sent to the cooperative station, and the satellite-borne software definition controller sends control information and issues an updated flow table. And repeating the process, continuously monitoring the satellite-ground link state, selecting a proper modulation and coding mode, and calculating the link capacity according to the modulation and coding mode, and then using a satellite software defined controller to transfer resources to assist in forwarding the service data.
When the satellite-ground link suffers from severe attenuation, the ground station 431 is the original best receiving ground station, and the ground station 432 is an assisting ground station and undertakes the receiving and forwarding work of part of low-priority service data;
the ground network where the ground stations 431 and 432 are located is deployed with a ground software defined network system 430, and the ground SDN network controller 434 issues a routing flow table and control information to the optical switch according to a destination address of data after the ground stations receive the data, and forwards the data through an optical fiber link between the ground stations.
The decision process of the multi-site assistance strategy is operated in an application layer of the SDN network, and the decision can be considered from the aspects of data flow requirements, flow monitoring, performance indexes of a satellite network and a ground backbone network, network operator policies and the like. Specifically, SDN applications need to obtain QoS and priority requirements of data flows, specify services active in satellite and terrestrial networks and resources occupied by them, and obtain the needs of network operators in emergency and premium users.
When the data stream meets the switching requirement, the SDN application informs the corresponding satellite terminal and the receiving antenna to switch respective frequencies, and updates forwarding rules in a gateway and a backbone network. The combination of application programming and network function virtualization in the SDN can more efficiently manage network rich network functions, and allows forwarding rules matched with data packets to be dynamically deployed according to requirements.
Referring to fig. 4, a flowchart of a method for multiple ground stations to cooperate to resist satellite channel fading according to an embodiment of the present invention is shown, where the method includes:
s500, the satellite terminal performs comprehensive decoding and channel estimation on the received signal to obtain a satellite-ground channel state;
s510, selecting a proper modulation coding scheme according to the alternative MODCOD in the adaptive modulation coding scheme according to the acquired channel information;
s520, estimating the upper limit L of the link capacity after the link uses the selected modulation coding schemem；
S530, detecting the length L of data waiting to be forwarded in a link;
s540, comparing the relation between the length of the waiting data and the upper limit of the link capacity: l ism>When L is S550, L>LmThen S560 is adopted;
s550, not changing the data route;
s560, calculating the residual link capacity L of all ground stationsn；
S570, matching the remaining data to be forwarded and the cooperative sites;
s580, changing beyond LmInter-satellite routing of data to collaboration sites;
and S590, the satellite-borne software definition controller sends the control information and issues the updated flow table, and the S500 is repeated.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the method, electronic device, communication medium, and computer program product embodiments, the description is relatively simple as they are substantially similar to the system embodiments, and reference may be made to some descriptions of the method embodiments for relevant points.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. A multi-ground-site cooperative satellite channel fading resisting system is characterized in that the system comprises an adaptive modulation and coding device, a satellite software defined network control system and a ground site software defined network control system, wherein,
the adaptive modulation and coding device is used for acquiring channel fading of a satellite and a ground station, automatically selecting a modulation and coding mode meeting the requirement of the system error rate, sending the selected modulation and coding mode to the ground station user transmitting and receiving device, and ensuring communication under the condition of meeting the requirement of the system error rate;
the satellite software defined network control system comprises: the system comprises a satellite-borne SDN controller and an on-board optical switch, wherein the satellite-borne SDN controller and the on-board optical switch are used for acquiring satellite-to-ground channel bandwidth capacity, load data volume required by the system and service priority, forwarding data through a satellite-to-ground link between a satellite and a ground station according to a data service priority sequence, changing a residual data route, and forwarding data which cannot be accommodated by a channel to the rest ground stations with residual bandwidth;
the ground site software defined network control system comprises: and the SDN controller, the optical switch and the optical fiber link are used for acquiring the routing topology among ground stations, receiving a residual data routing table and forwarding the data flow after the routing is changed to a target station by a ground network according to a target node of the data flow.
2. The system of claim 1, wherein said adaptive modulation and coding means comprises: an ACM mode selector, a code modulator, a satellite terminal comprehensive demodulator, wherein,
the ACM mode selector is used for receiving a return channel signal, selecting the optimal MODCOD and sending the MODCOD to the code modulator;
the code modulator is used for receiving the MODCOD and the data source sent by the ACM mode selector and modulating data into a laser emission signal according to the MODCOD code;
the satellite terminal comprehensive demodulator is used for receiving laser signals sent by a ground station, comprehensively demodulating the signals, including clock synchronization, frame synchronization and carrier synchronization, estimating the signal-to-noise ratio of the signals, selecting MODCOD according to the signal-to-noise ratio estimated value, and sending the selected MODCOD to a ground user.
3. The system of claim 2, wherein the satellite software defined network control system comprises: a satellite-borne SDN controller, an on-board optical switch, wherein,
the satellite-borne SDN controller is used for receiving satellite software and hardware resource information, estimating satellite-to-ground link bandwidth capacity according to MODCOD selected by the ACM mode selector in claim 2, analyzing bandwidth and service priority required by service data, forwarding high-priority service data according to an original route, changing a route of low-priority data exceeding the current satellite channel capacity, and updating a route flow table of the on-board optical switch;
the on-board optical switch is used for receiving a routing flow table sent by the satellite-borne SDN controller and forwarding data according to the flow table.
4. The system of claim 1, wherein the ground site software defined network control system comprises: an SDN controller, an optical switch, a fiber link, wherein,
the SDN controller is used for receiving software and hardware information in a ground network, abstracting network, cache and computing resources into a resource pool according to the software and hardware information, and dynamically allocating the resources according to the requirements of users;
the optical switch is used for forwarding data flow received by the ground station from a satellite, receiving control information and a flow table sent by the SDN controller, and forwarding the data flow to a destination node according to the flow table.
5. The system of any of claims 1-4, further comprising: a ground control center, wherein,
the ground control center is used for receiving information of the satellite software definition control system and the ground software definition control system, monitoring the satellite and the ground network, calculating the channel capacity and the occupation situation of all ground stations, and sending the information to the satellite software definition system.
6. The system of claim 3, wherein the system further comprises: geosynchronous orbit satellites and low orbit satellites, wherein,
the geosynchronous orbit satellite is used for deploying a satellite SDN controller, collecting satellite network information, managing a satellite network according to the network information and a preset management strategy and sending control information to other low-orbit satellites;
and the low orbit satellite is used for receiving the data access request of the ground station and the control information, and receiving and forwarding the data sent by the ground station according to the control information.
7. The system of claim 4, wherein the system further comprises: an active ground station and a standby ground station, wherein,
the active ground station is used for receiving satellite transmission data and forwarding the received data to a destination node through a ground software defined network;
and the standby ground station is used for receiving the control information of the satellite software defined controller and assisting the active ground station with serious satellite-ground channel attenuation to transmit part or all of the data.
8. The system of claim 7, wherein the adaptive modulation and coding method comprises:
receiving signals transmitted by an active ground station to a satellite;
comprehensively demodulating signals sent by the active ground station, and estimating the signal-to-noise ratio of the signals in real time;
transmitting the signal-to-noise ratio estimation value back to the ground station, and selecting an optimal modulation coding mode by using the signal-to-noise ratio estimation value;
according to the selected modulation coding scheme, carrying out coding modulation on the service data and forwarding the service data to the satellite node;
and repeating the process, estimating the signal-to-noise ratio of the signal in real time, and updating the used modulation coding scheme.
9. A multi-site assistance method, the method comprising:
acquiring network data load information including a data destination node, priority and data volume, comparing the relation between the length of waiting data and the upper limit of link capacity and taking corresponding measures;
calculating the current satellite-ground channel capacity by using a ground control center, and preferentially forwarding service data displayed as high priority in network data load information;
inquiring available collaboration site channel residual capacity information, using a backup route of low-priority service data calculated by a satellite-borne software definition controller, and forwarding the backup route to a collaboration site through a collaboration site satellite-ground link;
and starting a wired network between the cooperative stations, and forwarding data to a destination node through the assisting station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010486510.XA CN111835394B (en) | 2020-06-01 | 2020-06-01 | Multi-ground-station cooperative satellite channel attenuation resisting system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010486510.XA CN111835394B (en) | 2020-06-01 | 2020-06-01 | Multi-ground-station cooperative satellite channel attenuation resisting system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111835394A CN111835394A (en) | 2020-10-27 |
| CN111835394B true CN111835394B (en) | 2022-03-08 |
Family
ID=72897500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010486510.XA Active CN111835394B (en) | 2020-06-01 | 2020-06-01 | Multi-ground-station cooperative satellite channel attenuation resisting system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111835394B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910537B (en) * | 2020-11-13 | 2022-09-27 | 中国空间技术研究院 | Method and device for determining satellite communication adaptive coding modulation mode |
| CN113014310B (en) * | 2021-02-23 | 2023-02-21 | 重庆邮电大学 | Airborne broadband satellite communication channel simulation system based on DVB-RCS2 and application method |
| CN113271142B (en) * | 2021-06-03 | 2022-06-07 | 中国科学院软件研究所 | Operation control system and operation control method of software defined satellite |
| CN113411166A (en) * | 2021-06-18 | 2021-09-17 | 北京邮电大学 | Joint adaptive coding modulation system and method for satellite-ground laser link |
| CN115883009A (en) * | 2021-09-29 | 2023-03-31 | 元祚国际科技发展有限公司 | Satellite telemetering data transmission method and related equipment |
| CN113708828B (en) * | 2021-10-27 | 2022-02-08 | 武汉兴图新科电子股份有限公司 | Beidou third-order short message channel scheduling method and system |
| CN115549755B (en) * | 2022-09-13 | 2024-05-07 | 中国电子科技集团公司第五十四研究所 | Ka frequency band rain attenuation resisting method based on task-driven automatic inter-station switching |
| CN117856877A (en) * | 2024-03-06 | 2024-04-09 | 广东世炬网络科技有限公司 | Data transfer method, device, equipment and storage medium in NTN (network time network) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100886903B1 (en) * | 2006-12-06 | 2009-03-09 | 한국전자통신연구원 | Method and system for a effective adaptive coding and modulation in satellite communication system |
| CN105959232B (en) * | 2016-06-16 | 2018-07-10 | 清华大学 | A kind of satellite network method for routing based on software defined network control points optimization |
| CN105933174B (en) * | 2016-07-12 | 2018-10-19 | 重庆邮电大学 | A kind of precomputation restoration methods based on apart from adaptive routing and frequency spectrum distribution |
| CN107346988B (en) * | 2017-06-20 | 2019-12-13 | 大连大学 | Delay/disconnection tolerant network routing calculation method based on low earth orbit satellite network |
| US10523312B1 (en) * | 2018-07-03 | 2019-12-31 | Asia Satellite Telecommunications Company Limited | High throughput satellites and methods of operating high throughput satellites for relaying data between low earth orbit satellites to endpoints |
| CN109379167B (en) * | 2018-09-30 | 2021-07-13 | 北京空间飞行器总体设计部 | Adaptive variable coding modulation data transmission system and method for near-earth remote sensing satellite |
-
2020
- 2020-06-01 CN CN202010486510.XA patent/CN111835394B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111835394A (en) | 2020-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111835394B (en) | Multi-ground-station cooperative satellite channel attenuation resisting system and method | |
| Farserotu et al. | A survey of future broadband multimedia satellite systems, issues and trends | |
| Darwish et al. | LEO satellites in 5G and beyond networks: A review from a standardization perspective | |
| Taleb et al. | Explicit load balancing technique for NGEO satellite IP networks with on-board processing capabilities | |
| Wood | Internetworking with satellite constellations | |
| CN101573889B (en) | Web/bulk transfer preallocation of upstream resources in satellite communication system | |
| US20070109985A1 (en) | User terminal employing quality of service path determination and bandwidth saving mode for a satellite ISP system using non-geosynchronous orbit satellites | |
| US20010026537A1 (en) | Satellite internet backbone network system using virtual onboard switching | |
| Giambene | Resource management in satellite networks | |
| Taleb et al. | Recent trends in IP/NGEO satellite communication systems: transport, routing, and mobility management concerns | |
| WO2019204312A1 (en) | Maintaining and distributing state due to temporary failures in a shared bandwidth network | |
| Le-Ngoc et al. | Interactive multimedia satellite access communications | |
| CA3115764A1 (en) | Bonding and redundancy for satellite transport paths | |
| US6167028A (en) | Methods and apparatus for facilitating transmission of cells having multiple priorities in a cell relay network | |
| KR20080030331A (en) | Hierarchical channel adaptive packet scheduling mechanism for satellite networks | |
| US6661996B1 (en) | Satellite communication system providing multi-gateway diversity to a mobile user terminal | |
| Kota | Broadband satellite networks: trends and challenges | |
| US20020054576A1 (en) | Distributed asynchronous transfer mode (ATM) switch architecture for satellites | |
| US7701894B2 (en) | Switching system, a transmission device, a transmission method, and a switching method for satellites | |
| CN112187340A (en) | Rerouting method for guaranteeing QoS of low-orbit constellation network | |
| Barsocchi et al. | Radio resource management across multiple protocol layers in satellite networks: A tutorial overview | |
| Durresi et al. | Routing of real-time traffic in a transformational communications architecture | |
| Xilouris et al. | Dynamic bandwidth allocation for LAN-2-LAN interconnection using DVB-S satellite transmission | |
| Kota et al. | Multimedia satellite networks and TCP/IP traffic transport | |
| Celandroni et al. | Suitability of DAMA and contention-based satellite access schemes for TCP traffic in mobile DVB-RCS |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |