CN112019255B - Transparent and processing mixed low-orbit inter-satellite networking communication system and method - Google Patents
Transparent and processing mixed low-orbit inter-satellite networking communication system and method Download PDFInfo
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- CN112019255B CN112019255B CN202010840937.5A CN202010840937A CN112019255B CN 112019255 B CN112019255 B CN 112019255B CN 202010840937 A CN202010840937 A CN 202010840937A CN 112019255 B CN112019255 B CN 112019255B
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Abstract
One embodiment of the invention discloses a transparent and processing mixed low-orbit inter-satellite networking communication system and method. The system comprises: the satellite system comprises a main node satellite and an attached node satellite, wherein the main node satellite is used for transmitting user information carrying target satellite information, and allocating resources of the attached node satellite and performing beam control; and the additional node satellite is used for transmitting the user information carrying the target satellite information to the main node satellite or the ground gateway station. The system can greatly reduce the total configuration number of the inter-satellite communication terminals on the premise of ensuring relatively ideal networking performance, and has less average routing hops, better performance and less cost increase.
Description
Technical Field
The present invention relates to the field of satellite communications. And more particularly, to a transparent and handling hybrid low-earth-orbit inter-satellite networking communication system and method.
Background
In a low-earth satellite communication system, the technical trend is to adopt an inter-satellite link to realize inter-satellite networking, so that shorter end-to-end communication time delay can be obtained, the problem of inflexible arrangement of ground gateway stations can be solved, and a small number of ground stations can be relied on during constellation operation.
For a transparent forwarding satellite system, the absence of inter-satellite links leads to the fact that the extension range of the ground service completely depends on the arrangement of ground gateway stations. Each satellite only carries 2 sets of inter-satellite links, still depends on the layout of the ground gateway station, and has the problems of large time delay, multiple hops, incapability of flow equalization and the like. Each satellite carries 4 sets of inter-satellite links, so that a good networking effect can be obtained, but the weight, power consumption and cost of the satellite are greatly improved.
Disclosure of Invention
In view of the above, a first embodiment of the present invention provides a transparent and processing hybrid low-earth-orbit inter-satellite networking communication system, comprising a main node satellite and an additional node satellite, wherein,
the main node satellite is used for transmitting user information carrying target satellite information, allocating resources of the auxiliary node satellite and performing beam control;
and the additional node satellite is used for transmitting the user information carrying the target satellite information to the main node satellite or the ground gateway station.
In one embodiment, the master node satellite comprises a feed side beam, a user side beam, an inter-satellite communication terminal, an inter-satellite processing unit and an on-board router, wherein,
the user side wave beam is used for receiving the user information carrying the target satellite information and sending the user information to the inter-satellite processing unit;
the inter-satellite communication terminal is used for transmitting the user information between the satellite and the satellite;
the feed side wave beam is used for sending the user information to the ground gateway station;
the inter-satellite processing unit is used for processing the beam information from the user side, the terminal signal or the feed side;
and the satellite-borne router is used for connecting the user side wave beam, the inter-satellite data processing unit and the feed side wave beam and selecting a transmission path according to the processing result of the inter-satellite processing unit.
In one embodiment, the additional node satellite includes a feed side beam, a user side beam, an inter-satellite communications terminal, and a switch, wherein,
the user side wave beam is used for receiving user information carrying target satellite information;
the inter-satellite communication terminal is used for transmitting the user information between the satellite and the satellite;
the feed side wave beam is used for sending the user information to a ground gateway station;
and the selector switch is used for switching the transmission mode of the user information.
In a specific embodiment, the transmission mode includes:
and transmitting through the inter-satellite communication terminal and the feed side beam.
A second embodiment of the present invention provides a method for transparent and processing hybrid low-earth-orbit inter-satellite networking communication, comprising:
step 1: utilizing the transparent and hybrid low earth orbit satellite inter-satellite networking communication system of any one of the first aspects;
step 2: acquiring satellite information of which the coverage area comprises the position of a user;
and step 3: judging whether the satellite comprises a ground gateway station or not;
and 4, step 4: and establishing communication between the user and the target satellite according to the satellite and whether the ground gateway station is included.
In a specific embodiment, the step 4 includes:
if the satellite is an attached node satellite and does not contain the ground gateway station, the attached node satellite transmits the user information to a main node satellite, and the main node satellite is responsible for distributing target satellite access information to the user and establishing communication;
if the satellite is an attached node satellite and comprises the ground gateway station, the attached node satellite transmits the user information to the ground gateway station, and the ground gateway station is responsible for distributing access information of a target satellite to users and establishing communication;
if the satellite is a main node satellite and does not contain the ground gateway station, the satellite is responsible for distributing target satellite access information to the user and establishing communication;
if the satellite is a main node satellite and comprises the ground gateway station, the main node is responsible for transmitting user information to the ground gateway station through self-feeding side wave beams, and the ground gateway station is responsible for establishing communication between a user and a target satellite.
In one embodiment, the additional node satellite transmitting the user information to the main node satellite comprises:
the transfer switch of the satellite with the node switches the transmission mode to be transmitted through the inter-satellite communication terminal, and the satellite with the node transfers the user information to the inter-satellite communication terminal of the main node satellite through the inter-satellite communication terminal.
In one embodiment, the transmitting of the user information by the satellite to the ground gateway station comprises:
the transfer mode is switched to the feeding side wave beam by the transfer switch of the additional node satellite, and the additional node satellite transmits the user information to the ground gateway station through the feeding side wave beam.
The invention has the following beneficial effects:
the invention can greatly reduce the total configuration number of the inter-satellite communication terminals on the premise of ensuring more ideal networking performance, and has less average routing hops, better performance and less cost increase. Compared with the condition that each satellite carries 4 sets of inter-satellite links, the total number of inter-satellite communication terminals can be greatly reduced, the average route hop count is less, compared with the condition that each satellite carries 2 sets of inter-satellite links, the route hop count can be greatly reduced, the flow can be balanced, and the number of the required inter-satellite links is equivalent.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 illustrates a hybrid low-earth-orbit inter-satellite networking communication system capable of implementing one embodiment of the present invention.
Fig. 2 illustrates a method of transparent and process hybrid low-earth-orbit inter-satellite networking communications according to an embodiment of the invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Example 1-a transparent and handling hybrid Low-Earth inter-satellite networking communication System
As shown in fig. 1, an embodiment of the present invention provides a transparent and processing hybrid low-earth-orbit inter-satellite networking communication system, where different inter-satellite communication terminals are configured on different satellites, nodes in a constellation are divided into a master node satellite 10 and an additional node satellite 15, each master node satellite is divided into one group with 1 master node satellite and 4 additional node satellites, and the satellites are connected by inter-satellite links.
The main node satellite comprises 1-2 feed side beams 101, a plurality of user side beams 103, 8 inter-satellite communication terminals 105, 8 inter-satellite processing units 107 and 1 satellite-borne router 109, wherein the 8 inter-satellite communication terminals 105 comprise 6 sets of terminals with two-dimensional acquisition and tracking capabilities, and 2 sets of terminals without acquisition and tracking capabilities, so that communication between the satellite and the satellite is realized. The user side beam 103 is used for receiving the user information carrying the target satellite information and sending the user information to the inter-satellite processing unit; an inter-satellite communication terminal 105 for transmitting the user information between the satellite and the satellite; a feed side beam 101 for transmitting the user information to the ground gateway station; an inter-satellite processing unit 107, configured to process the user-side beam, inter-satellite communication terminal signal, or feed-side beam information; and the satellite-borne router is used for connecting the user side wave beam, the inter-satellite data processing unit and the feed side wave beam and selecting a transmission path according to the processing result of the inter-satellite processing unit. The satellite-borne router 109 is used for connecting user side beams, 8 inter-satellite data processing units and feed side beams; the master node also has the capability of controlling and allocating resources such as beams of the attached nodes and is responsible for allocating the resources such as beams, frequencies, time slots and the like of the attached nodes and controlling the beams.
The additional node satellite 15 includes a number of user side beams 151, 1-2 feed side beams 153, 1 inter-satellite communications terminal 157, and 1 switch 159. A user-side beam 151 for receiving user information carrying target satellite information; an inter-satellite communication terminal 157 for transmitting the user information between satellites; a feed side beam 153 for transmitting the user information to a ground gateway station; and a switch 159 for switching the transmission mode of the user information, that is, switching between transmission via the inter-satellite communication terminal and transmission via the feeding side beam.
The method can greatly reduce the total configuration number of the inter-satellite communication terminals on the premise of ensuring relatively ideal networking performance, can greatly reduce the total number of the inter-satellite communication terminals compared with the condition that each satellite carries 4 sets of inter-satellite links, has less average route hops, can greatly reduce the route hops compared with the condition that each satellite carries 2 sets of inter-satellite links, can carry out flow balance, and has equivalent required inter-satellite links.
Example 2-a transparent and Process hybrid Low-Earth inter-satellite networking communication method
As shown in fig. 2, one embodiment of the present invention provides a hybrid low-earth-orbit inter-satellite networking communication method for transparency and processing.
When the user sends a communication request, the user information containing the target satellite information is immediately sent to the satellite with the coverage range including the position of the user, and whether the satellite contains the ground gateway station or not is judged.
The target satellite may be a main node satellite, an additional node satellite, or a ground gateway station, and is not limited specifically herein.
If the satellite is an attached node satellite and the satellite does not have a ground gateway station, a user side beam of the attached node satellite receives user information and then sends the user information to an inter-satellite communication terminal, meanwhile, a change-over switch is switched to transmit the user information through the inter-satellite communication terminal, the communication terminal of the attached node satellite sends the user information to a user terminal of a main node satellite, the inter-satellite communication terminal of the main node satellite transmits the user information to an inter-satellite processing unit, the inter-satellite processing unit analyzes information of a target satellite contained in the user information and analyzes the beam, frequency and other resources of the target satellite, and then a satellite-borne router of the main node satellite distributes local related beam information to which the user information needs to go to the user according to a processing result of the inter-satellite processing unit, so that the communication between the user and the target satellite is established.
If the satellite is an attached node satellite and the satellite comprises a ground gateway station, after user information is received by a user side beam of the attached node satellite, the change-over switch can be switched to transmit the user information through a feeder side beam, the attached node satellite transmits the user information to the ground gateway station through a feeder side beam circuit, and the ground gateway station is responsible for distributing required places for the user information, so that communication between a user and a target satellite is established.
If the satellite is a main node satellite and the satellite has no ground gateway station, user side wave beams of the main node satellite receive user information, the user information is sent to an inter-satellite processing unit to analyze information of a target satellite contained in the user information and analyze resources such as wave beams, frequency and the like of the target satellite, and then a satellite-borne router of the main node satellite distributes relevant wave beam information of a place where the user information needs to go to the user according to a processing result of the inter-satellite processing unit, so that communication between the user and the target satellite is established.
If the satellite is a main node satellite and comprises a ground gateway station, after the user side wave beam of the main node satellite receives the information, the satellite-borne router sends the user information to the ground gateway station through the feed side wave beam, and the ground gateway station is responsible for distributing the required place for the user information, so that the communication between the user and the target satellite is established.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (7)
1. A transparent and processing hybrid low-earth-orbit inter-satellite networking communication system comprising a primary node satellite and an additional node satellite, wherein,
the satellite system comprises a main node satellite, a satellite system and a satellite system, wherein the main node satellite is used for receiving user information from an attached node satellite when a satellite covering a user is the attached node satellite and does not contain a ground gateway station, distributing target satellite access information to the user to establish communication, distributing the target satellite access information to the user when the satellite covering the user is the main node satellite and does not contain the ground gateway station, establishing communication, transmitting the user information carrying the target satellite information to the ground gateway station to establish communication when the satellite covering the user is the main node satellite and contains the ground gateway station, and distributing resources of the attached node satellite and performing beam control;
the satellite with the additional node is used for transmitting the user information carrying the target satellite information to the main node satellite when the satellite covering the user is the satellite with the additional node and does not contain the ground gateway station; and when the satellite covering the user is an attached node satellite and contains the ground gateway station, transmitting the user information carrying the target satellite information to the ground gateway station.
2. The system of claim 1, wherein the master node satellite comprises a feed side beam, a user side beam, an inter-satellite communications terminal, an inter-satellite processing unit, and an on-board router, wherein,
the user side wave beam is used for receiving the user information carrying the target satellite information and sending the user information to the inter-satellite processing unit;
the inter-satellite communication terminal is used for transmitting the user information between the satellite and the satellite;
the feed side wave beam is used for sending the user information to the ground gateway station;
the inter-satellite processing unit is used for processing the beam information from the user side, the terminal signal or the feed side;
and the satellite-borne router is used for connecting the user side wave beam, the inter-satellite data processing unit and the feed side wave beam and selecting a transmission path according to the processing result of the inter-satellite processing unit.
3. The system of claim 1, wherein the additional node satellite comprises a user side beam, an inter-satellite communications terminal, a feed side beam, and a switch, wherein,
the user side wave beam is used for receiving user information carrying target satellite information;
the inter-satellite communication terminal is used for transmitting the user information between the satellite and the satellite;
the feed side wave beam is used for sending the user information to a ground gateway station;
and the selector switch is used for switching the transmission mode of the user information.
4. The system of claim 3, wherein the transmission means comprises:
and transmitting through the inter-satellite communication terminal and the feed side beam.
5. A method for transparent and handling hybrid low-earth-orbit inter-satellite networking communications, comprising:
step 1: utilizing the hybrid low-earth-orbit inter-satellite networking communication system of any one of claims 1-4;
step 2: acquiring satellite information of which the coverage area comprises the position of a user;
and step 3: judging whether the satellite comprises a ground gateway station or not;
and 4, step 4: establishing communication between a user and a target satellite according to the satellite and whether the ground gateway station is included, wherein the step 4 comprises the following steps:
if the satellite is an attached node satellite and does not contain the ground gateway station, the attached node satellite transmits the user information to a main node satellite, and the main node satellite is responsible for distributing target satellite access information to users and establishing communication;
if the satellite is an attached node satellite and comprises the ground gateway station, the attached node satellite transmits the user information to the ground gateway station, and the ground gateway station is responsible for distributing access information of a target satellite to users and establishing communication;
if the satellite is a main node satellite and does not contain the gateway station, the satellite is responsible for distributing target satellite access information to the user and establishing communication;
if the satellite is a main node satellite and comprises the ground gateway station, the main node is responsible for transmitting user information to the ground gateway station through self-feeding side wave beams, and the ground gateway station is responsible for establishing communication between a user and a target satellite.
6. The method of claim 5, wherein the additional node satellite transmitting the user information to the primary node satellite comprises:
the transfer mode of the transfer switch of the satellite with the node is switched to be transferred through the inter-satellite communication terminal, and the satellite with the node transfers the user information to the inter-satellite communication terminal of the main node satellite through the inter-satellite communication terminal.
7. The method of claim 5, wherein the transmitting the user information to the ground gateway station by the satellite comprises:
the transfer mode is switched to the feeding side wave beam by the transfer switch of the additional node satellite, and the additional node satellite transmits the user information to the ground gateway station through the feeding side wave beam.
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| CN114285456B (en) * | 2021-12-21 | 2023-02-28 | 西安电子科技大学 | Wave beam hopping communication method and satellite load equipment for low-orbit satellite communication system |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6442147B1 (en) * | 1997-04-18 | 2002-08-27 | Nortel Networks Limited | Connectionless communications network |
| US7366125B1 (en) * | 2003-07-24 | 2008-04-29 | Bbn Technologies Corp. | Extensible satellite communication system |
| CN105375961A (en) * | 2015-11-26 | 2016-03-02 | 中国空间技术研究院 | Satellite frequency-band sharing method based on beam hopping mode |
| CN107689826A (en) * | 2016-08-05 | 2018-02-13 | 北京信威通信技术股份有限公司 | A kind of method, apparatus and satellite system of ground core network roaming |
| CN109995420A (en) * | 2019-01-23 | 2019-07-09 | 长沙天仪空间科技研究院有限公司 | A kind of inter-satellite space communication system and method |
| CN110072264A (en) * | 2019-05-28 | 2019-07-30 | 重庆邮电大学 | A kind of LEO Satellite switching method |
| CN110518963A (en) * | 2019-09-04 | 2019-11-29 | 航天科工空间工程发展有限公司 | Low rail wideband satellite communication system connectivity tasks planing method |
| CN111106865A (en) * | 2018-10-25 | 2020-05-05 | 华为技术有限公司 | Communication method, device and system based on satellite network |
| CN111416657A (en) * | 2020-03-19 | 2020-07-14 | 西安电子科技大学 | Satellite network route updating maintenance system and maintenance method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103685023B (en) * | 2013-11-18 | 2017-01-18 | 中国空间技术研究院 | Broadband satellite communication system and method based on satellite-borne IP switching |
-
2020
- 2020-08-20 CN CN202010840937.5A patent/CN112019255B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6442147B1 (en) * | 1997-04-18 | 2002-08-27 | Nortel Networks Limited | Connectionless communications network |
| US7366125B1 (en) * | 2003-07-24 | 2008-04-29 | Bbn Technologies Corp. | Extensible satellite communication system |
| CN105375961A (en) * | 2015-11-26 | 2016-03-02 | 中国空间技术研究院 | Satellite frequency-band sharing method based on beam hopping mode |
| CN107689826A (en) * | 2016-08-05 | 2018-02-13 | 北京信威通信技术股份有限公司 | A kind of method, apparatus and satellite system of ground core network roaming |
| CN111106865A (en) * | 2018-10-25 | 2020-05-05 | 华为技术有限公司 | Communication method, device and system based on satellite network |
| CN109995420A (en) * | 2019-01-23 | 2019-07-09 | 长沙天仪空间科技研究院有限公司 | A kind of inter-satellite space communication system and method |
| CN110072264A (en) * | 2019-05-28 | 2019-07-30 | 重庆邮电大学 | A kind of LEO Satellite switching method |
| CN110518963A (en) * | 2019-09-04 | 2019-11-29 | 航天科工空间工程发展有限公司 | Low rail wideband satellite communication system connectivity tasks planing method |
| CN111416657A (en) * | 2020-03-19 | 2020-07-14 | 西安电子科技大学 | Satellite network route updating maintenance system and maintenance method |
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