CN210807274U - Low earth orbit satellite network structure - Google Patents
Low earth orbit satellite network structure Download PDFInfo
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- CN210807274U CN210807274U CN201922002300.4U CN201922002300U CN210807274U CN 210807274 U CN210807274 U CN 210807274U CN 201922002300 U CN201922002300 U CN 201922002300U CN 210807274 U CN210807274 U CN 210807274U
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Abstract
The utility model relates to a low orbit satellite network structure, low orbit satellite network structure includes that a first controller and a plurality of distribution installed on ground are at the orbital low orbit satellite of earth low orbit warp, wherein, adopt the physics link to connect between the low orbit satellite, first controller with the satellite of crossing in a plurality of low orbit satellites communicates, can communicate between interconnect's the low orbit satellite. The utility model discloses simplify low orbit satellite network structure, reduced system's deployment cost by a wide margin, and improved the flexibility of network.
Description
Technical Field
The utility model relates to a low orbit satellite communication technical field especially relates to a low orbit satellite network structure.
Background
The Low Earth Orbit (LEO) Low Earth Orbit network is a space network formed by a plurality of Low Earth Orbit (LEO) Low Earth Orbit satellites, and the height of the Low Earth Orbit satellites is 500KM-1000KM from the ground. With the success of satellite miniaturization, the manufacturing and transmission costs of low earth orbit satellites continue to decrease, which makes it possible to build switching networks within space with low earth orbit satellites. The network operation mode of the existing low earth orbit satellite network is that the satellites are arranged according to a certain orbit, one satellite is generally provided with a ground station, and ground terminal equipment held by a user transmits radio and performs one-hop forwarding through the satellite passing the top currently, so that communication between the user and the user or access to the internet by the user is realized, for example, an iridium satellite system, as shown in fig. 1.
Therefore, in the existing low-earth-orbit network system, the management and control of the satellite are completed by the ground station, the management and control of the satellite can be performed only when the satellite passes through the ground station, the satellite needs to have autonomous capability in other time to autonomously complete network forwarding tasks, no or a small number of inter-satellite links exist among the satellites (for example, 2 inter-satellite links for experiments on an iridium satellite system), the networking capability is not provided, the ground stations need to interact with each other and the existing ground network needs to be rented, however, the cost consumption is huge and the maintenance difficulty is increased no matter the ground station is deployed globally or expensive bandwidth is rented, so that the cost control cannot be effectively realized by the traditional satellite network design, the network flexibility is poor, and the network operation income is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a low orbit satellite network structure has simplified low orbit satellite network structure, has reduced the system deployment cost by a wide margin, and has improved the flexibility of network.
In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided a low-earth satellite network structure comprising a first controller installed on the ground and a plurality of low-earth satellites distributed on the earth at low-earth orbit,
the low-orbit satellites are connected through physical links, the first controller is communicated with overhead satellites in the low-orbit satellites, and the low-orbit satellites connected with each other can be communicated with each other.
Further, the physical link includes a laser link and a radio link.
Furthermore, the physical topology of the low-earth-orbit satellite network structure is a lattice topology structure which is connected end to end and comprises a plurality of rings.
Further, the system comprises one or more second controllers installed on the ground and used for replacing the first controllers to communicate with the overhead low-orbit satellite when the first controllers fail.
Furthermore, each low orbit satellite is provided with a network switching module and a space communication module, wherein,
the network switching module is used for receiving control information of a control plane sent by the first controller, converting the control information into a corresponding control instruction and sending the control instruction to the space communication module, and receiving data forwarding control information sent by the first controller, converting the data forwarding control information into a corresponding data forwarding instruction and sending the data forwarding instruction to the space communication module;
the space communication module is used for forwarding control information of the control plane to the corresponding satellite according to the received control instruction and forwarding data to the corresponding satellite or ground terminal according to the received data forwarding instruction.
Further, the network switching module comprises a control plane management interface, a data plane management interface, a management process unit and a control agent unit, wherein,
the control plane management interface is respectively connected with the first controller and the management process unit, and is used for receiving control information of the control plane sent by the first controller and sending the control information to the management process unit;
the data plane management interface is respectively connected with the first controller and the management process unit, and is used for receiving data forwarding control information sent by the first controller and sending the data forwarding control information to the management process unit;
the management process unit is used for generating or rewriting a control information flow table according to the received control information of the control plane, generating or rewriting a data forwarding flow table according to the received data forwarding control information, and forwarding the control information and the data forwarding control information of the control plane to the control agent unit;
the control agent unit is respectively connected with the management process unit and the soft switch path unit and is used for analyzing the control information of the control plane, converting the control information into a control instruction, forwarding the control information of the control plane to a corresponding satellite according to a control information flow table and the control instruction, analyzing data forwarding control information, converting the control information into a data forwarding instruction, and sending the data forwarding flow table to a hardware unit corresponding to the space communication module through the soft switch path according to the data forwarding flow table;
the soft switch access unit is respectively connected with the network card equipment and the control agent unit, and is used for analyzing the data message received from the network card equipment and matching the data forwarding flow table.
Further, the space communication module comprises an antenna, a conversion unit, a baseband and a network card device which are connected in sequence, wherein,
the network card equipment is used for converting the data format of the data to be forwarded and supporting the required access function, and the access function comprises a TDMA function;
the baseband is used for carrying out coding modulation of a digital domain on data to be transmitted and transmitting the data to the digital/analog conversion subunit, and is also used for demodulating and decoding digital signals received from the analog/digital conversion subunit and transmitting the digital signals to the network card equipment;
the conversion unit comprises a digital-to-analog conversion subunit and an analog-to-digital conversion subunit, wherein the digital-to-analog conversion subunit is used for converting a digital signal into an analog signal, and the analog-to-digital conversion subunit is used for converting the analog signal into a digital signal;
the antenna is used for receiving and transmitting modulated radio waves.
Further, the network switching module further includes:
and the fault recovery unit is used for rewriting the control information flow table and making a recovery decision when the network has a fault.
Further, the network switching module further includes:
the system management interface is used for monitoring the health condition of the operating system and managing and recovering;
the core network management interface is used for interacting user management information with the core network module;
the user management unit is used for authenticating and charging users during network operation and sending QOS control information to the management process unit;
the management process unit is also used for generating or rewriting a QOS strategy according to the QOS control information.
Compared with the prior art, the utility model obvious advantage and beneficial effect have. Borrow by above-mentioned technical scheme, the utility model relates to a low orbit satellite network structure can reach comparable technical advancement and practicality to have the wide use value in the industry, it has following advantage at least:
the utility model discloses need not the ground station deployment of global scope, also need not to rent ground network, through establish the link between the low orbit satellite and realize communicating with same ground station, can establish the low orbit satellite network, simplified low orbit satellite network structure, reduced system's deployment cost by a wide margin, improved the flexibility of network; furthermore, the utility model discloses a control plane and data plane separation have realized the controllable in-band control of control plane to the fault-tolerant ability and the coordination ability of low earth orbit satellite network have been strengthened.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a conventional low earth orbit satellite network;
fig. 2 is a schematic diagram of a low earth orbit satellite network according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a service process of a low earth orbit satellite network structure according to an embodiment of the present invention;
fig. 4(a) is a physical topology structure diagram of a low earth orbit satellite network according to an embodiment of the present invention;
fig. 4(b) is a logical topology structure diagram of a low earth orbit satellite network according to an embodiment of the present invention;
fig. 4(c) is a schematic data flow path diagram of a low earth orbit satellite network according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a low earth orbit satellite network and a ground gateway 4 according to an embodiment of the present invention.
[ notation ] to show
1: the first controller 2: low earth orbit satellite
3: the mobile terminal 4: ground gateway
21: the network switching module 22: space communication module
211: control plane management interface 212: data plane management interface
213: the management process unit 214: control agent unit
215: the failure recovery unit 216: system management interface
217: core network management interface 218: user management unit
221: antenna 222: conversion unit
223: base band 224: network card device
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the intended purpose of the present invention, the following detailed description will be given with reference to the accompanying drawings and preferred embodiments of a low-earth orbit satellite network structure and its effects.
The embodiment of the utility model provides a low earth orbit satellite network structure, as shown in figure 2, including a first controller 1 and a plurality of distribution that install on ground at the orbital low earth orbit satellite 2 of earth low orbit warp, wherein, adopt the physics link to connect between the low earth orbit satellite 2, first controller 1 with the satellite of crossing in a plurality of low earth orbit satellites 2 communicates, can communicate between interconnect's the low earth orbit satellite 2. Wherein the physical link may be a laser link and a radio link.
The utility model discloses satellite among the low earth orbit satellite network structure can form the intersatellite link with neighbouring satellite, and two arbitrary satellites on the whole network can both rely on one to jump or jump the intersatellite link realization communication more. On the basis, a globally unique first controller 1 is set on the ground, the first controller 1 is located at a ground station, the controller is connected with a satellite passing the top at a certain moment and is connected with all satellites in the whole network through inter-satellite links, control information is interacted, before the first controller 1 is located outside the coverage range of the current satellite, the first controller 1 completes connection with the next satellite passing the top, namely switching is completed, control information interaction is achieved by using a new satellite passing the top, and therefore full-time whole network management and control can be achieved. As an example, the low earth orbit satellite network structure further includes one or more second controllers installed on the ground to communicate with the over-top low earth orbit satellite 2 instead of the first controller 1 when the first controller 1 fails, so that the stability and reliability of the low earth orbit satellite network structure can be improved.
The embodiment of the utility model provides a low orbit satellite network structure has the logical only network controller in the whole network, and first controller 1 promptly need not the ground station deployment of global scope, also need not to rent ground network, through establish the link between low orbit satellite 2 and realize with same ground station communication, can establish low orbit satellite network and simplified low orbit satellite network structure, reduced the system deployment cost by a wide margin, and improved the flexibility of network.
Fig. 3 shows the utility model discloses the service method of low earth orbit satellite network structure, similar with mobile network, mobile terminal 3 (can deploy on vehicle, mobile device etc.) can communicate with the satellite that crosses through the radio, after the satellite that crosses is crossed in the information access, can reach ground gateway 4 through one jump or many jump intersatellite link, and ground gateway 4 forwards information to internet or assembles the back with information and forwards to user terminal through satellite network, from this can know, the utility model discloses low earth orbit satellite network structure can be compatible current network system.
Fig. 4(a) -4 (c) show the networking mode of the low earth orbit satellite network according to the embodiment of the present invention, and fig. 4(a) is the physical topology structure of the low earth orbit satellite network, which is a lattice-like network with a plurality of rings connected end to end. The physical topology is characterized in that the routing between the same pair of nodes is extremely rich, and the transmission of the service flow in the network can select different paths because of flexible adjustment capability. The utility model discloses the phase separation is forwardded with the network to network control on the satellite of low earth orbit satellite network structure, only receives on the satellite node promptly and forwardding the instruction and accomplish according to the instruction and forwardding, and the formation (the strategy of forwardding) of forwardding the instruction is accomplished by first controller 1. This has the advantage that, in addition to the first controller 1 enabling full network information collection to form better decisions, frequent broadcasts caused by the conventional "self-learning" procedure can be avoided as much as possible. This also makes all satellites work in two-layer exchange state, without setting network segment and route domain, thus further improving the forwarding speed and reducing the control complexity.
The existing ground commercial network also has a technology of separating control and forwarding, and is characterized in that control information needs to be interacted through an independent control network. However, in a space network such as a low earth orbit satellite network, due to resource limitation, it is difficult to physically separate a management network or add a management channel, because a new transceiver needs to be added, which may cause severe interference in space, and increase system load and management cost, etc., so that existing inter-satellite links can be used to multiplex control information and data information together, and a logical channel is reserved for the control information to form a plane for control information flow, which is also called in-band (in-band) control. In the traditional in-band control, the information flow of the control plane is uncontrolled, and the forwarding of the control information depends on the traditional self-learning and needs the whole network broadcasting. Because a large number of loops exist in the physical topology of the low-earth orbit satellite network, a network storm is inevitably formed through self-learning of the whole network broadcast, and further port blockage is caused, so that data communication is influenced, which cannot be tolerated. Therefore, it is necessary to redesign the in-band control, and the core principle of this design is to let the control plane (i.e. the whole of the control channel) be controlled by the first controller 1, and the control result of the first controller 1 to the control plane does not affect the data forwarding function at all. On the basis of the physical topology of the low-earth orbit satellite network shown in fig. 4(a), the forwarding flow table for the control information is designed for each node so that the control channels form a tree-shaped control plane, as shown in fig. 4(b), the control plane topology is basically unchanged in normal operation, but when the network size changes or a network failure occurs, the control plane is adjusted. Fig. 4(c) is a diagram illustrating that a unified controller is used to control a route between any two points, so that an optimal path configuration can be completed without forming a loop and a network storm.
In order to realize the separation of the control plane and the data plane, the control plane can be controlled in-band control, and a low-orbit satellite network with high flexibility, strong fault-tolerant capability and strong coordination capability is realized on the basis, and a satellite of the low-orbit satellite network is required to be provided with corresponding module support. Fig. 5 illustrates a detailed structure of a satellite node and a ground gateway 4 node in a low earth orbit satellite network, and the detailed description of each part of the satellite node is first described below:
as an example, each of the low-earth orbit satellites 2 is installed with a network switching module 21 and a space communication module 22, it should be noted that, in order to illustrate a plurality of satellites included in a low-earth orbit satellite network structure, fig. 5 shows a plurality of space communication modules 22, and each space communication module 22 corresponds to one satellite, but since there are many constituent units in the network switching module 21, all constituent units in each network switching module 21 are not shown one by one, but it can be understood that each low-earth orbit satellite structure includes one network switching module 21 and one space communication module 22. The network switching module 21 is configured to receive control information of a control plane sent by the first controller 1, convert the control information into a corresponding control instruction, and send the control instruction to the spatial communication module 22, and receive data forwarding control information sent by the first controller 1, convert the control information into a corresponding data forwarding instruction, and send the data forwarding instruction to the spatial communication module 22; the space communication module 22 is configured to forward control information of the control plane to a corresponding satellite according to the received control instruction, and forward data to the corresponding satellite or ground terminal according to the received data forwarding instruction.
The network switching module 21 includes a control plane management interface 211, a data plane management interface 212, a management process unit 213, and a control agent unit 214, where the control plane management interface 211 is connected to the first controller 1 and the management process unit 213, respectively, and is configured to receive control information of a control plane sent by the first controller 1 and send the control information to the management process unit 213; the data plane management interface 212 is respectively connected to the first controller 1 and the management process unit 213, and is configured to receive data forwarding control information sent by the first controller 1 and send the data forwarding control information to the management process unit 213; the management process unit 213 has a globally unique and fixed IP address, and is configured to generate or rewrite a control information flow table according to the received control information of the control plane, generate or rewrite a data forwarding flow table according to the received data forwarding control information, and forward the control information and the data forwarding control information of the control plane to the control agent unit 214, and the like; the control agent unit 214 is connected to the management process unit 213 and the soft switch path unit, and configured to analyze the control information of the control plane, convert the control information into a control instruction, forward the control information of the control plane to a corresponding satellite according to a control information flow table and the control instruction, analyze data forwarding control information, convert the control information into a data forwarding instruction, and send the data forwarding flow table to a hardware unit corresponding to the spatial communication module 22 through the soft switch path, where the control instruction and the data forwarding instruction are hardware instructions, and may perform cooperative control on hardware devices in the spatial communication module 22; the soft switch path unit is connected to the network card device 224 and the control agent unit 214, and is configured to parse the data packet received from the network card device 224 and match the data forwarding flow table. Wherein the flow table: refers to a forwarding table for a traffic flow, and typically includes fields identifying the flow and to which port the corresponding action is directed, etc.
As an example, the network switching module 21 further includes a failure recovery unit 215, configured to rewrite the flow table of control information and make a recovery decision when a network fails, and the recovery decision is not controlled by the first controller 1. The network switching module 21 may further include a system management interface 216, a core network management interface 217, and a user management unit 218, where the system management interface 216 is used to monitor, manage, and recover the health status of the operating system; the core network management interface 217 is used for interacting user management information with the core network module; the user management unit 218 is used for performing user authentication and charging during network operation, and sending quality of service (QOS) control information to the management process unit 213; the management process unit 213 is further configured to generate or rewrite a QOS policy according to the QOS control information.
As an example, the spatial communication module 22 includes an antenna 221, a conversion unit 222, a baseband 223 and a network card device 224, which are connected in sequence, where the network card device 224 is configured to convert a data format of data to be forwarded and support a required access function, and the access function includes a Time Division Multiple Access (TDMA) technology; the baseband 223 is configured to perform coding modulation in a digital domain on data to be transmitted and transmit the data to the digital-to-analog conversion subunit, and is further configured to demodulate and decode a digital signal received from the analog-to-digital conversion subunit and transmit the digital signal to the network card device 224; the conversion unit 222 includes a digital/analog conversion subunit for converting a digital signal into an analog signal and an analog/digital conversion subunit for converting an analog signal into a digital signal; the antenna 221 is used for receiving and transmitting modulated radio waves.
The ground gateway 4 node is provided with an air antenna 221 for overhead satellite interaction data; the main difference with the satellite node is that, in order to be compatible with the ground network, the switching equipment in the 4 nodes of ground gateway can directly adopt commercial switch, has embodied the embodiment of the utility model discloses the compatibility of low earth orbit satellite network mechanism and current network.
Based on the satellite node structure shown in fig. 5, taking a video service as an example, an embodiment of a network operation process is described step by step:
(1) the user requests a video service, the video server sends the content to the corresponding gateway, the gateway completes the user authentication, and the rate limitation is carried out according to the payment standard of the user;
(2) the gateway sends the video stream forwarding intention to the first controller 1, the first controller 1 designs a video transmission path and a QoS strategy and sends control information (forwarding through a control plane) to a related satellite, and after configuration is successful, the gateway sends the control information to the overhead satellite through an air antenna;
(3) in the overhead satellite, radio waves carrying video streams are received by an antenna 221 and then sequentially pass through an analog/digital conversion unit 222, a baseband 223 and a network card device 224 to reach a soft switch path;
(3) in the operating system, before the video stream arrives, the data forwarding control information is received by the data forwarding management interface, and a data forwarding stream table is added or rewritten; in addition, the control agent unit 214 cooperatively controls the antenna angle, the analog/digital and digital/analog conversion rate, the baseband coding and decoding method and modulation format, and the QoS policy of the network card, so as to ensure the high-reliability data receiving and transmitting; after the video stream arrives, the video stream can be forwarded to the specified network card device 224 only by forwarding the stream table according to the data;
(4) the network card device 224 queues and forwards the video stream according to the priority of the video stream according to the QoS policy, and sends the video stream to the baseband 223, the digital/analog conversion unit 222, and to the adjacent satellite or ground terminal via the antenna 221.
The low-orbit satellite network structure provided by the embodiment of the utility model does not need the arrangement of ground stations in the global scope and rents ground networks, and can be used for constructing the low-orbit satellite network by establishing links between low-orbit satellites and realizing the communication with the same ground station, thereby simplifying the low-orbit satellite network structure, greatly reducing the system arrangement cost and improving the flexibility of the network; furthermore, the utility model discloses a low earth orbit satellite network structure's control plane and data plane separation have realized the controllable in-band control of control plane to the fault-tolerant ability and the coordination ability of low earth orbit satellite network have been strengthened.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.
Claims (9)
1. A low-earth-orbit satellite network structure is characterized in that,
comprises a first controller arranged on the ground and a plurality of low-orbit satellites distributed on the earth in low-orbit meridian orbits, wherein,
the low-orbit satellites are connected through physical links, the first controller is communicated with overhead satellites in the low-orbit satellites, and the low-orbit satellites connected with each other can be communicated with each other.
2. The low-earth-orbit satellite network structure of claim 1,
the physical link includes a laser link and a radio link.
3. The low-earth-orbit satellite network structure of claim 1,
the physical topology of the low-earth-orbit satellite network structure is a lattice topology structure which is connected end to end and comprises a plurality of rings.
4. The low-earth-orbit satellite network structure of claim 1,
one or more second ground-mounted controllers are also included for communicating with overhead low earth orbit satellites in lieu of the first controller in the event of a failure of the first controller.
5. The low-earth-orbit satellite network structure of any one of claims 1 to 4,
each low earth orbit satellite is provided with a network switching module and a space communication module, wherein,
the network switching module is used for receiving control information of a control plane sent by the first controller, converting the control information into a corresponding control instruction and sending the control instruction to the space communication module, and receiving data forwarding control information sent by the first controller, converting the data forwarding control information into a corresponding data forwarding instruction and sending the data forwarding instruction to the space communication module;
the space communication module is used for forwarding control information of the control plane to the corresponding satellite according to the received control instruction and forwarding data to the corresponding satellite or ground terminal according to the received data forwarding instruction.
6. The low-earth-orbit satellite network structure of claim 5,
the network switching module comprises a control plane management interface, a data plane management interface, a management process unit and a control agent unit, wherein,
the control plane management interface is respectively connected with the first controller and the management process unit, and is used for receiving control information of the control plane sent by the first controller and sending the control information to the management process unit;
the data plane management interface is respectively connected with the first controller and the management process unit, and is used for receiving the data forwarding control information sent by the first controller and sending the data forwarding control information to the management process
The management process unit is used for generating or rewriting a control information flow table according to the received control information of the control plane, generating or rewriting a data forwarding flow table according to the received data forwarding control information, and forwarding the control information and the data forwarding control information of the control plane to the control agent unit;
the control agent unit is respectively connected with the management process unit and the soft switch access unit and is used for analyzing the control information of the control plane, converting the control information into a control instruction, forwarding the control information of the control plane to a corresponding satellite according to a control information flow table and the control instruction, analyzing data forwarding control information, converting the data forwarding control information into a data forwarding instruction, and sending the data forwarding flow table to a hardware unit corresponding to the space communication module through a software switch access according to the data forwarding flow table;
the soft switch access unit is respectively connected with the network card equipment and the control agent unit, and is used for analyzing the data message received from the network card equipment and matching the data forwarding flow table.
7. The low-earth-orbit satellite network structure of claim 6,
the space communication module comprises an antenna, a conversion unit, a baseband and a network card device which are connected in sequence, wherein,
the network card equipment is used for converting the data format of the data to be forwarded and supporting the required access function, and the access function comprises a TDMA function;
the baseband is used for carrying out coding modulation of a digital domain on data to be transmitted and transmitting the data to the digital/analog conversion subunit, and is also used for demodulating and decoding digital signals received from the analog/digital conversion subunit and transmitting the digital signals to the network card equipment;
the conversion unit comprises a digital-to-analog conversion subunit and an analog-to-digital conversion subunit, wherein the digital-to-analog conversion subunit is used for converting a digital signal into an analog signal, and the analog-to-digital conversion subunit is used for converting the analog signal into a digital signal;
the antenna is used for receiving and transmitting modulated radio waves.
8. The low-earth-orbit satellite network structure of claim 6,
the network switching module further comprises:
and the fault recovery unit is used for rewriting the control information flow table and making a recovery decision when the network has a fault.
9. The low-earth-orbit satellite network structure of claim 6,
the network switching module further comprises:
the system management interface is used for monitoring the health condition of the operating system and managing and recovering;
the core network management interface is used for interacting user management information with the core network module;
the user management unit is used for authenticating and charging users during network operation and sending QOS control information to the management process unit;
the management process unit is also used for generating or rewriting a QOS strategy according to the QOS control information.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110830104A (en) * | 2019-11-19 | 2020-02-21 | 北京前沿探索深空科技有限公司 | Low earth orbit satellite network structure, networking method, controller and medium |
| CN111541479A (en) * | 2020-06-22 | 2020-08-14 | 北京前沿探索深空科技有限公司 | Low earth orbit satellite mobile network terminal switching method, electronic equipment and medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110830104A (en) * | 2019-11-19 | 2020-02-21 | 北京前沿探索深空科技有限公司 | Low earth orbit satellite network structure, networking method, controller and medium |
| CN111541479A (en) * | 2020-06-22 | 2020-08-14 | 北京前沿探索深空科技有限公司 | Low earth orbit satellite mobile network terminal switching method, electronic equipment and medium |
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