CN111162833B - Low-orbit satellite information forwarding method, device and system, controller and medium - Google Patents
Low-orbit satellite information forwarding method, device and system, controller and medium Download PDFInfo
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- CN111162833B CN111162833B CN202010267200.9A CN202010267200A CN111162833B CN 111162833 B CN111162833 B CN 111162833B CN 202010267200 A CN202010267200 A CN 202010267200A CN 111162833 B CN111162833 B CN 111162833B
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- 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
- H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
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- 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
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- 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
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Abstract
The invention relates to a method, a device and a system for forwarding low-orbit satellite information, a controller and a medium, wherein the method comprises the steps of receiving and processing a first signal sent by a sending end to generate message information; determining a corresponding output channel based on the message information and a preset forwarding flow table; and processing the message information, generating a second signal, and sending the second signal to a receiving end through the output channel. The invention enables the low-orbit satellite to have the function of on-satellite information forwarding, reduces the cost and improves the communication speed and the utilization rate of satellite resources.
Description
Technical Field
The invention relates to the technical field of low-orbit satellite communication, in particular to a low-orbit satellite information forwarding method, device and system, a controller and a medium.
Background
A low Earth Orbit (L ow Earth Orbit) satellite, L EO for short, forms a space network, and the low Earth Orbit satellite covers an area on Earth by radio, and users in the area can access the satellite to realize various forms of communication.
The information processing and forwarding of the traditional communication satellite are usually completed on the ground, and the satellite only carries out transparent forwarding. During low-orbit (500-1000 km) operation, the time for flying over the ground station every time is only a few minutes, and at other times, the transparent forwarding communication satellite cannot work. In addition, a large number of ground stations are needed to complete global coverage, and the satellites can have a transparent forwarding function only by keeping the ground stations below each satellite all the time, so that the cost is extremely high. Therefore, the low earth orbit satellite constellation forwarding resources cannot be allocated, congestion can only continue to be blocked, and idle satellite resources can be always idle and cannot be allocated to a busy network segment completely determined by ground requirements.
Disclosure of Invention
The invention aims to provide a method, a device and a system for forwarding information of a low-earth orbit satellite, a controller and a medium, so that the low-earth orbit satellite has an on-satellite information forwarding function, the cost is reduced, and the communication speed and the satellite resource utilization rate are improved.
In order to solve the above technical problem, according to an aspect of the present invention, there is provided a low-earth orbit satellite information forwarding method, including:
receiving and processing a first signal sent by a sending end to generate message information;
determining a corresponding output channel based on the message information and a preset forwarding flow table;
and processing the message information, generating a second signal, and sending the second signal to a receiving end through the output channel.
Further, the receiving and processing the first signal sent by the sending end to generate message information includes:
receiving a first signal sent by a sending end;
converting the first signal into a first analog signal of L frequency band;
converting the first analog signal to a first digital signal;
and demodulating, decoding and protocol analyzing the first digital signal to generate the message information.
Further, determining a corresponding output channel based on the message information and a preset forwarding flow table includes:
the message header of the message information is directly moved to a user state from a kernel state by bypassing an operating system protocol stack;
and matching the mapping definition of the data source and the data destination according to the message header and the forwarding flow table so as to obtain a corresponding output channel.
Further, the processing the message information to generate a second signal includes:
carrying out protocol encapsulation, coding and modulation on the message information to generate a second digital signal;
converting the second digital signal into an L frequency band second analog signal;
converting the second analog signal to a second signal.
Further, the first signal and the second signal are both high-frequency electromagnetic signals, the transmitting end is a ground terminal or a low-orbit satellite, and the receiving end is a ground terminal or a low-orbit satellite.
According to another aspect of the present invention, there is provided a low earth orbit satellite information transmitting apparatus, installed on a low earth orbit satellite, comprising:
the information receiving module is configured to receive and process a first signal sent by a sending end to generate message information;
the output channel determining module is configured to determine a corresponding output channel based on the message information and a preset forwarding flow table;
and the information sending module is configured to process the message information, generate a second signal and send the second signal to a receiving end through the output channel.
Further, the information receiving module and the information sending module both comprise an antenna module, a frequency converter, an AD/DA converter and a baseband module, wherein,
in the information receiving process:
the antenna module is used for receiving a first signal sent by a sending end;
the frequency converter is used for converting the first signal into a first analog signal of L frequency band;
the AD/DA converter is used for converting the first analog signal into a first digital signal;
the baseband module is used for demodulating, decoding and protocol analyzing the first digital signal to generate the message information;
in the information sending process:
the baseband module is used for generating a second digital signal after carrying out protocol encapsulation, code adding and modulation on the message information;
the AD/DA converter is used for converting the second digital signal into an L frequency band second analog signal;
the frequency converter is used for converting the second analog signal into a second signal;
the antenna module is used for sending the second signal to a receiving end through the output channel.
Furthermore, the antenna module comprises an inter-satellite antenna and a satellite-ground antenna, the inter-satellite antenna is used for communicating with a low-orbit satellite, and the satellite-ground antenna is used for communicating with a ground transmitting end or a ground receiving end.
Further, the output channel determination module includes:
the driving unit is configured to directly move the message header of the message information from the kernel state to the user state by bypassing an operating system protocol stack;
and the output channel determining unit is configured to match the mapping definition of the data source and the data destination according to the message header and the forwarding flow table, so as to obtain a corresponding output channel.
Further, the first signal and the second signal are both high-frequency electromagnetic signals, the transmitting end is a ground terminal or a low-orbit satellite, and the receiving end is a ground terminal or a low-orbit satellite.
According to another aspect of the present invention, there is provided a low earth orbit satellite information forwarding system, comprising a ground station controller installed on the ground and a plurality of low earth orbit satellites, each of the low earth orbit satellites being installed with the low earth orbit satellite information forwarding device, the low earth orbit satellites being connected by a physical link, the ground station controller communicating with an overhead satellite of the low earth orbit satellites, the low earth orbit satellites being connected to each other to be able to forward information through the low earth orbit satellite information forwarding devices.
According to yet another aspect of the invention, a controller is provided comprising a memory and a processor, the memory storing a computer program enabling the implementation of the steps of the method when the program is executed by the processor.
According to yet another aspect of the invention, a computer-readable storage medium is provided for storing a computer program, which when executed by a computer or processor, performs the steps of the method.
Compared with the prior art, the invention has obvious advantages and beneficial effects. By means of the technical scheme, the low-orbit satellite information forwarding method, the device, the system, the controller and the medium can achieve considerable technical progress and practicability, have wide industrial utilization value and at least have the following advantages:
the invention enables the low-orbit satellite to have the on-satellite information forwarding function and the on-satellite data packet processing capability, can realize global coverage through the network control of the single ground station low-orbit satellite, can realize information forwarding and inter-satellite communication without arranging a large number of ground stations on the ground stations, reduces the cost, and improves the communication speed and the satellite resource utilization rate.
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 in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a flow chart illustrating a method for forwarding low earth orbit satellite information according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an information forwarding apparatus for a low-earth orbit satellite according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an information forwarding apparatus for a low earth orbit satellite according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an output channel determination process in a low-earth orbit satellite information forwarding process according to an embodiment of the present invention.
[ notation ] to show
1: the information receiving module 2: output channel determination module
3: the information sending module 11: antenna module
12: the frequency converter 13: AD/DA converter
14: the baseband module 111: inter-satellite antenna
112: satellite-ground antenna 21: drive unit
22: output channel determination unit
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the predetermined objects, the following detailed description of the embodiments and effects of a method, an apparatus, a system, a controller and a medium for transmitting low-earth orbit satellite information according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
The embodiment of the invention provides a low earth orbit satellite information forwarding method, as shown in fig. 1, comprising the following steps:
step S1, receiving and processing the first signal sent by the sending end to generate message information;
the message information includes information such as data source information, data destination information, and data to be forwarded.
Step S2, determining a corresponding output channel based on the message information and a preset forwarding flow table;
the data flow table can store the address segment and forwarding outlet information corresponding to the address segment.
And step S3, processing the message information, generating a second signal, and sending the second signal to a receiving end through the output channel.
The method of the embodiment of the invention ensures that the low-orbit satellite has the function of on-satellite information forwarding, reduces the cost and improves the communication speed and the utilization rate of satellite resources.
As an example, the first signal and the second signal are both high-frequency electromagnetic signals, the transmitting end is a ground terminal or a low-earth orbit satellite, and the receiving end is a ground terminal or a low-earth orbit satellite, where the ground terminal includes a mobile phone, a notebook, a vehicle-mounted computer, and the like.
As an example, the step S1 includes:
step S11, receiving a first signal sent by a sending end;
step S12, converting the first signal into a L frequency band first analog signal;
step S13, converting the first analog signal into a first digital signal;
step S14, demodulating, decoding, and analyzing the first digital signal to generate the message information.
As an example, the step S2 includes:
step S21, directly moving the message header of the message information from the kernel mode to the user mode by bypassing the protocol stack of the operating system;
and step S22, obtaining a corresponding output channel according to the mapping definition of the message header and the forwarding flow table matching the data source and the data destination, so as to move the data to the matching mapping definition outlet to send out the data.
Specifically, as shown in fig. 4, in step S21-step S22, the operating system includes two parts, one part is in a user mode, and the other part is in a kernel mode, and the header of the packet arriving at the network port can be directly moved to the forwarding logic in the user mode by bypassing the protocol stack of the operating system through a high-speed driver, so that a large amount of operating system interrupt processing overhead and memory copy overhead can be saved. After the forwarding logic of the user mode receives the moved message header, the mapping definitions of the data source and the data destination are matched through the definition of the forwarding flow table, and the data is moved to the matched mapping definition outlet from the high-speed drive to be sent out, which can be embodied as selecting a corresponding antenna to send out.
As an example, the step S3 includes:
step S31, carrying out protocol encapsulation, code adding and modulation on the message information to generate a second digital signal;
step S32, converting the second digital signal into a L frequency band second analog signal;
step S33, converting the second analog signal into a second signal;
and step S34, sending the second signal to a receiving end through the output channel.
By the method, the sending end can forward information to the receiving end through one satellite or forward information among multiple satellites to the receiving end, and information forwarding efficiency and satellite resource utilization rate are improved.
The embodiment of the invention also provides a low orbit satellite information forwarding device, as shown in fig. 2, which is installed on a low orbit satellite and comprises an information receiving module 1, an output channel determining module 2 and an information sending module 3, wherein the information receiving module 1 is configured to receive and process a first signal sent by a sending end to generate message information, and the message information comprises information such as data source information, data destination information and carried data to be forwarded. The output channel determining module 2 is configured to determine a corresponding output channel based on the packet information and a preset forwarding flow table, where the data flow table may store an address segment and forwarding exit information corresponding to the address segment. The information sending module 3 is configured to process the message information, generate a second signal, and send the second signal to a receiving end through the output channel.
The device of the embodiment of the invention enables the low-orbit satellite to have the function of on-satellite information forwarding, reduces the cost and improves the communication speed and the utilization rate of satellite resources.
As an example, the first signal and the second signal are both high-frequency electromagnetic signals, the transmitting end is a ground terminal or a low-earth satellite, and the receiving end is a ground terminal or a low-earth satellite.
As shown in fig. 3, the information receiving module 1 and the information sending module 3 each include an antenna module 11, a frequency converter 12, an AD/DA converter 13 (analog-to-digital/digital-to-analog converter), and a baseband module 14, wherein,
in the process of receiving information, the antenna module 11 is configured to receive a first signal sent by a sending end, the frequency converter 12 is configured to convert the first signal into a first analog signal in an L frequency band, the AD/DA converter 13 is configured to convert the first analog signal into a first digital signal, and the baseband module 14 is configured to demodulate, decode, and analyze a protocol of the first digital signal to generate the message information.
In the process of sending information, the baseband module 14 is configured to perform protocol encapsulation, code adding, and modulation on the message information to generate a second digital signal, the AD/DA converter 13 is configured to convert the second digital signal into a L frequency band second analog signal, the frequency converter 12 is configured to convert the second analog signal into a second signal, and the antenna module 11 is configured to send the second signal to a receiving end through the output channel.
As an example, as shown in fig. 3, the antenna module 11 includes an inter-satellite antenna 111 and a satellite-ground antenna 112, where the inter-satellite antenna 111 is used for communicating with a low earth orbit satellite, and the satellite-ground antenna 112 is used for communicating with a ground transmitting end or a ground receiving end. The antenna module 11 may be connected to the frequency converter 12 by a copper wire, and the frequency converter 12 may be connected to the AD/DA converter 13 daughter card by a copper wire, and the AD/DA daughter card is connected to the baseband module 14 by a high-speed serial bus (PCIE) interface.
The output channel determination module 2 may be disposed on a forwarding board, a Central Processing Unit (CPU) on the forwarding board is a general-purpose architecture, such as an ARM or RISC-V, and with the addition of various interfaces, a software system running on the forwarding board may be an L inux operating system.
As an example, the output channel determining module 2 includes a driving unit 21 and an output channel determining unit 22, where the driving unit 21 is configured to directly move a packet header of the packet information from a kernel state to a user state by bypassing an operating system protocol stack; the output channel determining unit 22 is configured to match the mapping definitions of the data source and the data destination according to the header and the forwarding flow table, so as to obtain a corresponding output channel.
As shown in fig. 4, the operating system includes two parts, one part is in a user mode, the other part is in a kernel mode, and the output channel determining module 2 can bypass the header of the packet arriving at the network port by the operating system protocol stack through the high-speed driver and directly move the header to the forwarding logic in the user mode, so that a large amount of operating system interrupt processing overhead and memory copy overhead can be saved. After the forwarding logic of the user mode receives the moved message header, the mapping definitions of the data source and the data destination are matched through the definition of the forwarding flow table, and the data is moved to the matched mapping definition outlet from the high-speed drive to be sent out, which can be embodied as selecting a corresponding antenna to send out.
It should be noted that, in order to prevent some constituent units in the low earth orbit satellite information forwarding device from suddenly failing and affecting the use of the low earth orbit satellite information forwarding device, a redundancy design may be performed, that is, a set of information receiving module 1, output channel determining module 2 and information sending module 3 are additionally arranged on the earth satellite, and when a unit therein fails, the earth satellite can be switched to another corresponding unit to continue to operate.
By the device provided by the embodiment of the invention, the sending end can forward information to the receiving end through one satellite, and also can forward information among satellites to the receiving end through a plurality of satellites, so that the information forwarding efficiency and the satellite resource utilization rate are improved.
The embodiment of the invention also provides a low-orbit satellite information forwarding system, which comprises a ground station controller and a plurality of low-orbit satellites, wherein the ground station controller and the low-orbit satellites are arranged on the ground, each low-orbit satellite is provided with the low-orbit satellite information forwarding device, the low-orbit satellites are connected by adopting a physical link, the ground station controller is communicated with overhead satellites in the low-orbit satellites, and the mutually connected low-orbit satellites can forward information by the low-orbit satellite information forwarding devices. The low-orbit satellite information forwarding system can ensure the information interaction of the control system in the ground station to all low-orbit satellites as long as the ground station is ensured to have the satellite to pass the top all the time, thereby realizing the whole network control. The scheme not only can greatly reduce the cost and the complexity, but also can enable the whole satellite to have more flexibility and can meet the requirement of network bandwidth which changes all the time.
The embodiment of the invention also provides a controller, which comprises a memory and a processor, wherein the memory stores a computer program, and the program can realize the steps of the low-orbit satellite information forwarding method when being executed by the processor.
Embodiments of the present invention also provide a computer-readable storage medium for storing a computer program, which when executed by a computer or a processor implements the steps of the low-earth orbit satellite information forwarding method.
The embodiment of the invention enables the low-orbit satellite to have the on-satellite information forwarding function and the on-satellite data packet processing capability, can realize global coverage through the network control of the single ground station low-orbit satellite, can realize information forwarding and inter-satellite communication without arranging a large number of ground stations on the ground stations, reduces the cost, and improves the communication speed and the satellite resource utilization rate.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A method for forwarding low-earth orbit satellite information is characterized by comprising the following steps:
receiving and processing a first signal sent by a sending end to generate message information;
determining a corresponding output channel based on the message information and a preset forwarding flow table;
processing the message information, generating a second signal, and sending the second signal to a receiving end through the output channel;
wherein, the determining the corresponding output channel based on the message information and the preset forwarding flow table includes:
directly moving the message header of the message information from the kernel state to the forwarding logic of the user state by bypassing an operating system protocol stack through high-speed driving;
and the forwarding logic of the user mode obtains a corresponding output channel according to the message header, the mapping definition of the forwarding flow table matched data source and the data destination, and moves the information to be sent from the high-speed drive to the output channel.
2. The method of claim 1, wherein the low-earth orbit satellite information is transmitted from the satellite base station,
the receiving and processing of the first signal sent by the sending end to generate message information includes:
receiving a first signal sent by a sending end;
converting the first signal into a first analog signal of L frequency band;
converting the first analog signal to a first digital signal;
and demodulating, decoding and protocol analyzing the first digital signal to generate the message information.
3. The method of claim 1, wherein the low-earth orbit satellite information is transmitted from the satellite base station,
the processing the message information to generate a second signal includes:
carrying out protocol encapsulation, coding and modulation on the message information to generate a second digital signal;
converting the second digital signal into an L frequency band second analog signal;
converting the second analog signal to a second signal.
4. The method according to any one of claims 1 to 3,
the first signal and the second signal are both high-frequency electromagnetic signals, the transmitting end is a ground terminal or a low-orbit satellite, and the receiving end is a ground terminal or a low-orbit satellite.
5. An information repeater for a low earth orbit satellite, which is installed in the low earth orbit satellite, comprising:
the information receiving module is configured to receive and process a first signal sent by a sending end to generate message information;
the output channel determining module is configured to determine a corresponding output channel based on the message information and a preset forwarding flow table;
the information sending module is configured to process the message information, generate a second signal and send the second signal to a receiving end through the output channel;
the output channel determination module includes:
the driving unit is configured to directly move the message header of the message information from the kernel state to the forwarding logic of the user state by bypassing the protocol stack of the operating system through high-speed driving;
and the output channel determining unit is configured to obtain a corresponding output channel by the forwarding logic of the user mode according to the message header, the mapping definition of the forwarding flow table matched data source and the mapping definition of the data destination, and move the information to be sent from the high-speed drive to the output channel.
6. The low-earth-orbit satellite information forwarding apparatus of claim 5,
the information receiving module and the information sending module respectively comprise an antenna module, a frequency converter, an AD/DA converter and a baseband module, wherein,
in the information receiving process:
the antenna module is used for receiving a first signal sent by a sending end;
the frequency converter is used for converting the first signal into a first analog signal of L frequency band;
the AD/DA converter is used for converting the first analog signal into a first digital signal;
the baseband module is used for demodulating, decoding and protocol analyzing the first digital signal to generate the message information;
in the information sending process:
the baseband module is used for generating a second digital signal after carrying out protocol encapsulation, code adding and modulation on the message information;
the AD/DA converter is used for converting the second digital signal into an L frequency band second analog signal;
the frequency converter is used for converting the second analog signal into a second signal;
the antenna module is used for sending the second signal to a receiving end through the output channel.
7. The low-earth-orbit satellite information forwarding apparatus of claim 6,
the antenna module comprises an inter-satellite antenna and a satellite-ground antenna, the inter-satellite antenna is used for communicating with a low-orbit satellite, and the satellite-ground antenna is used for communicating with a ground transmitting end or a ground receiving end.
8. The low-earth-orbit satellite information forwarding apparatus according to any one of claims 5 to 7,
the first signal and the second signal are both high-frequency electromagnetic signals, the transmitting end is a ground terminal or a low-orbit satellite, and the receiving end is a ground terminal or a low-orbit satellite.
9. An information retransmission system for low earth orbit satellites, comprising a ground station controller installed on the ground and a plurality of low earth orbit satellites, wherein each of the low earth orbit satellites is installed with the information retransmission device for low earth orbit satellites according to any one of claims 5 to 8, the low earth orbit satellites are connected by physical links, the ground station controller communicates with overhead satellites of the low earth orbit satellites, and the interconnected low earth orbit satellites can retransmit information by the information retransmission device for low earth orbit satellites.
10. A controller comprising a memory and a processor, characterized in that the memory stores a computer program which, when executed by the processor, is capable of carrying out the steps of the method of any one of claims 1 to 4.
11. A computer-readable storage medium for storing a computer program, the program implementing the steps of the method according to any one of claims 1 to 4 when executed by a computer or processor.
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| CN101908920B (en) * | 2010-07-22 | 2013-01-02 | 北京邮电大学 | Working method for satellite communication system based on single channel per carrier time division multiple access |
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