CN115021794B - Satellite mixed networking communication method and system of very high frequency data exchange system - Google Patents
Satellite mixed networking communication method and system of very high frequency data exchange system Download PDFInfo
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- CN115021794B CN115021794B CN202210551319.8A CN202210551319A CN115021794B CN 115021794 B CN115021794 B CN 115021794B CN 202210551319 A CN202210551319 A CN 202210551319A CN 115021794 B CN115021794 B CN 115021794B
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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
- H04B7/18513—Transmission in a satellite or space-based system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application discloses a satellite hybrid networking communication method and system of a very high frequency data exchange system, and relates to the technical field of very high frequency data exchange systems. The method comprises the following steps: establishing a very high frequency low-orbit constellation system which is communicated with a very high frequency shore station and a very high frequency shipborne terminal; when the very high frequency shipborne terminal performs very high frequency communication, judging whether the very high frequency shipborne terminal is in the network coverage area of the very high frequency shore station; when the very high frequency shipborne terminal is not in the network coverage area of the very high frequency shore station, a communication link is established with the very high frequency low rail constellation system for communication. The application can form a unified system network by the shore base station, the satellite base station and the shipborne terminal, and comprehensively allocate the use of the shore base and satellite base frequency resources.
Description
Technical Field
The application relates to the technical field of very high frequency data exchange systems, in particular to a satellite hybrid networking communication method and system of a very high frequency data exchange system.
Background
At present, a low-orbit satellite network is generally formed by adopting a mode without inter-satellite links or with inter-satellite links, and then a certain number of ground gateway earth stations are matched to form a unified network to provide services to the outside. However, due to the limited geographical location factor, the problem of global coverage communication cannot be met by only building gateway earth stations in China areas, and the method has the defect of high networking cost and basically cannot realize overseas real-time communication.
Disclosure of Invention
The application aims to solve the problems that the networking cost of the existing low-orbit satellite network networking communication scheme is high and the overseas real-time communication can not be realized basically, and provides a satellite hybrid networking communication method and system of a very high frequency data exchange system.
In a first aspect, a satellite hybrid networking communication method of a very high frequency data exchange system is provided, including:
establishing a very high frequency low-orbit constellation system which is communicated with a very high frequency shore station and a very high frequency shipborne terminal;
when the very high frequency shipborne terminal performs very high frequency communication, judging whether the very high frequency shipborne terminal is in the network coverage area of the very high frequency shore station or not;
and when the very high frequency shipborne terminal is not in the network coverage range of the very high frequency shore station, establishing a communication link with the very high frequency low-orbit constellation system to perform communication.
In one possible implementation of the first aspect, the vhf low rail constellation system includes: the very high frequency satellite base stations with the same orbit height but at least three orbit inclinations are used for covering all latitude ranges of the whole world.
In one possible implementation of the first aspect, data transmission is performed between the vhf shore station, the vhf on-board terminal, and the vhf low-rail constellation system through a preset radio frequency band.
In one possible implementation of the first aspect, the method further includes:
and when the very high frequency shipborne terminal is in the network coverage range of the target very high frequency shore station, establishing a communication link between the very high frequency shipborne terminal and the target very high frequency shore station.
In one possible implementation of the first aspect, the method establishes a communication link with the vhf low rail constellation system to perform communication, specifically includes:
the VHF shipborne terminal listens to bulletin board information of a VHF satellite base station in the VHF low-rail constellation system, and judges whether a gateway station exists in the network coverage area of the VHF satellite base station according to the bulletin board information;
when a gateway station is arranged in the network coverage area of the very high frequency satellite base station, establishing a communication link between the very high frequency shipborne terminal and the gateway station;
when no gateway station exists in the network coverage area of the very high frequency satellite base station, the route searches for the adjacent gateway station nearest to the same track through inter-satellite link transmission between the same track, and a communication link between the very high frequency shipborne terminal and the adjacent gateway station is established.
In a second aspect, a satellite hybrid networking communication system of a very high frequency data exchange system is provided, comprising: very high frequency low rail constellation system, very high frequency bank station and very high frequency on-board terminal, wherein:
the very high frequency low rail constellation system is used for communicating with a very high frequency shore station and a very high frequency shipborne terminal;
the VHF shipborne terminal is used for judging whether the VHF shipborne terminal is in the network coverage range of the VHF shore station or not when the VHF communication is carried out; and when the very high frequency shipborne terminal is not in the network coverage range of the very high frequency shore station, establishing a communication link with the very high frequency low-orbit constellation system to perform communication.
In one possible implementation of the second aspect, the very high frequency low rail constellation system includes: very high frequency satellite base stations with the same orbit height but at least three orbit inclinations, and the very high frequency satellite base stations with all orbit inclinations are used for covering all global ranges.
In one possible implementation of the second aspect, data transmission is performed between the vhf shore station, the vhf shipboard terminal and the vhf low rail constellation system through a preset radio frequency band.
In one possible implementation of the second aspect, the vhf on-board terminal is further configured to establish a communication link between the vhf on-board terminal and a target vhf shore station when within network coverage of the target vhf shore station.
In one possible implementation manner of the second aspect, the vhf shipboard terminal is specifically configured to listen to bulletin board information of a vhf satellite base station in the vhf low-rail constellation system, and determine whether a gateway station is located in a network coverage area of the vhf satellite base station according to the bulletin board information; when a gateway station is arranged in the network coverage area of the very high frequency satellite base station, establishing a communication link between the very high frequency shipborne terminal and the gateway station; when no gateway station exists in the network coverage area of the very high frequency satellite base station, the route searches for the adjacent gateway station nearest to the same track through inter-satellite link transmission between the same track, and a communication link between the very high frequency shipborne terminal and the adjacent gateway station is established.
By establishing a very high frequency low orbit constellation system, a shore base station, a satellite base station and a shipborne terminal can form a unified system network, so that the shore base and satellite base frequency resource use is comprehensively allocated.
Additional aspects of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
FIG. 1 is a schematic flow chart of a satellite hybrid networking communication method according to an embodiment of the present application;
FIG. 2 is a flow chart of a satellite hybrid networking communication method according to another embodiment of the present application;
FIG. 3 is a schematic view of three orbital tilt coverage ranges provided by other embodiments of the satellite hybrid networking communication method of the application;
FIG. 4 is a schematic diagram of a connection relationship provided by an embodiment of a satellite hybrid networking communication system according to the present application;
fig. 5 is a schematic diagram of connection relationships provided in other embodiments of the satellite hybrid networking communication system of the present application.
Detailed Description
The principles and features of the present application are described below with reference to the drawings, the illustrated embodiments are provided for illustration only and are not intended to limit the scope of the present application.
The very high frequency data exchange system (VDES) comprises an Automatic Identification System (AIS), special application messages (ASM) and very high frequency data exchange (VDE), and the satellite mixed networking communication method provided by the application is realized based on the very high frequency data exchange system, and can be composed of a ground shore base (VDE-TER) and a satellite air base (VDE-SAT) so as to realize information transmission and exchange among three parts of a satellite base, a shore base and a ship and offshore security information broadcasting.
The satellite space-based network can be a low-orbit satellite network and consists of a satellite constellation, a gateway earth station, a system control center, a network control center, a ship station terminal and the like. At present, a low-orbit satellite network generally adopts a mode of no inter-satellite link or inter-satellite link to form a low-orbit satellite networking, and then is matched with a certain number of ground gateway earth stations to form a unified network so as to provide services to the outside, but the mode of constructing gateway earth stations only in China areas can not meet the problem of global coverage communication due to the limited geographical position factors, the networking cost is higher, and the real-time communication problem outside the sea can not be basically realized.
The constellation system with inter-satellite links is characterized in that a communication link is established between space satellites and satellites, required communication data are transmitted to gateway earth stations capable of falling to the ground, so that a closed-loop communication link is realized, the deployment quantity of the satellite gateway earth stations can be greatly reduced, but a great technical problem still exists at present, the inter-satellite link communication technology cannot be well broken through, most of inter-satellite link communication between satellites which are relatively stable in the same orbit can only be realized, and stable transmission is still difficult to realize among satellites in different orbits; the other is a constellation system without inter-satellite links, and the satellites and the satellite groups can only carry out networking communication through gateway earth stations, so that a sufficient number of satellites are required to cover, and at least one gateway earth station needs to be built under the same satellite so as to support networking communication, thereby causing huge satellite networking engineering quantity. The method has the advantages that the method has simple networking and low technical requirements, but the network construction cost is increased, and the purpose of real-time communication can be realized only when all constellation networks are deployed.
Based on the above problems, the application provides a satellite hybrid networking communication method and a corresponding system, which make full use of the characteristics of the existing shore base station and combined with the offshore wireless communication to form a networking with a low-orbit satellite constellation, so that the connection capability of the satellite network is greatly improved, the cost and the construction time of a new station are saved, and simultaneously, the application provides a rapid optimal route selection when the satellite base and the shore base communication route are selected during the very high frequency data communication of the ship station, and provides a solution to the problem of realizing the network integration of the satellite base and the shore base in the ship communication in the same coverage area, and the application is described below with specific examples.
As shown in fig. 1, a flow chart provided for an embodiment of a satellite hybrid networking communication method of the present application, where the satellite hybrid networking communication method of the vhf data exchange system includes:
s1, establishing a very high frequency low-orbit constellation system which is communicated with a very high frequency shore station and a very high frequency shipborne terminal;
it should be noted that, the vhf shore station refers to a shore station having a vhf data exchange system or using the vhf data exchange system to perform communication, and the vhf shipborne terminal and the vhf low-rail constellation system are the same and will not be described again.
The track height of the vhf low-rail constellation system may be set according to practical requirements, for example, typically, the low rail may be 900km.
S2, when the very high frequency shipborne terminal performs very high frequency communication, judging whether the very high frequency shipborne terminal is in the network coverage area of the very high frequency shore station;
specifically, the vhf shipboard terminal may monitor bulletin board information broadcast by the vhf shore station, and if bulletin board information of a certain vhf shore station is monitored, it may be considered to be within network coverage of the vhf shore station.
It should be noted that, because the satellite base coverage area is larger, when the satellite base station along the sea is provided in the satellite coverage area, the satellite base downlink signal may interfere with the satellite base communication along the sea, in order to enable the satellite base station and the satellite base station to better cooperatively communicate with the shipborne terminal, the resource allocation principle of the satellite base station over the satellite base station is better complied, optionally, in the overlapping coverage areas of both sides, the resource allocation of the VDES will be performed by the satellite base station to allocate bulletin board information in an overall way, and meanwhile, the resource allocation information of the satellite base bulletin board is shared to the satellite base network, so that the satellite base communication and the satellite base communication form a unified cooperative network.
And S3, when the very high frequency shipborne terminal is not in the network coverage area of the very high frequency shore station, establishing a communication link with the very high frequency low-orbit constellation system to perform communication.
It should be understood that when the very high frequency shipborne terminal performs VDES communication, the shipborne terminal is preferentially judged whether to be in the coverage area of the shore-based network according to the resource allocation principle that the shore station takes precedence over the satellite-based network, if so, the shore-based bulletin board information is preferentially selected, the shore-based communication time slot and the frequency resource are applied, and a ship-shore communication link is established; if the satellite is not in the coverage area of the shore-based network, the satellite-based bulletin board information is listened to and selected, the satellite-based communication time slot and frequency resource are applied, whether an available gateway station exists in the satellite coverage area is judged, and if the gateway station exists in the satellite coverage area, a communication link network of the satellite and the shore is established, so that VDES communication data transmission is realized.
Because the shore base stations are distributed along the sea and the quantity is huge, the method fully utilizes the existing shore base stations, can quickly and effectively form satellite landing links of the same-orbit signals, optimizes satellite communication routes and reduces satellite network communication time delay as much as possible.
According to the satellite hybrid networking communication method, the very high frequency low-orbit constellation system is established, so that a shore base station, a satellite base station and a shipborne terminal can form a unified system network, and the shore base station and satellite base frequency resources are comprehensively allocated.
Optionally, in some possible embodiments, the very high frequency low rail constellation system includes: the very high frequency satellite base stations with the same orbit height but at least three orbit inclinations are used for covering all latitude ranges of the whole world.
It should be noted that, due to the consideration of economic benefit, most of low-orbit communication satellite networks transmitted in China currently only consider low-orbit satellite deployment within 50 degrees of north-south latitude, which is dense in navigation, and for high-latitude and high-inclination satellites, communication coverage of the north-south polar region cannot be realized. Thus, alternatively, three kinds of orbital tilt angles may be set respectively, that is, a low tilt angle orbit, a 0 tilt angle orbit, and a high tilt angle orbit, for example, assuming that a latitude range that a satellite can cover is ±20°, the low tilt angle orbit may be a 30 degree tilt angle orbit, and the high tilt angle orbit may be a 70 degree tilt angle orbit, so that the low tilt angle orbit and the 0 tilt angle orbit can realize real-time coverage within the latitude range ±50°, the high tilt angle orbit can realize real-time coverage of a high latitude, and the three kinds of orbital tilt angles cooperate to realize real-time coverage in a global range.
As shown in fig. 3, three kinds of orbital tilt coverage areas provided for other embodiments of the satellite hybrid networking communication method of the application are shown, a circle covering the earth represents the coverage area of each satellite, and a circle surrounding the earth represents the orbit of the satellite.
Optionally, in some possible embodiments, data transmission is performed between the vhf shore station, the vhf shipboard terminal and the vhf low rail constellation system through a preset radio frequency band.
It should be noted that, the existing shore base station may be upgraded by performing VDES station communication and satellite communication to match with a VDES low orbit constellation system, and perform data transmission in the same specific radio frequency band, so as to form a converged network of the shore base station and the satellite base of the VDES.
By adopting the constellation networking mode of three different orbit inclinations, the maximum satellite coverage capacity is realized under the condition of minimum satellite resources, the three different orbit inclinations respectively meet the requirements of different key shipping communication guarantees, not only can hot spot shipping routes be effectively guaranteed, but also the routes of north-south polar channels are added, and under the condition of the prior art capacity, the common orbit inter-satellite link communication which is easy to realize is adopted so as to reduce the construction requirements of gateway earth stations as much as possible. Meanwhile, the resources of the existing coastal base stations are fully utilized, the integration communication of the satellite-shore network is realized, the VDES communication network of the satellite-shore integration is further formed, the repeated investment construction of the newly-built gateway station is reduced economically, and the energy and construction cost are saved.
Referring to fig. 2, a flow chart is provided for other embodiments of the satellite hybrid networking communication method according to the present application, and some alternative embodiments of the present application are described below with reference to fig. 2.
Optionally, in some possible embodiments, as shown in fig. 2, further including:
and when the very high frequency shipborne terminal is in the network coverage range of the target very high frequency shore station, establishing a communication link between the very high frequency shipborne terminal and the target very high frequency shore station.
Specifically, the vhf shipborne terminal may monitor the bulletin board information broadcasted by the vhf shore station, and when the bulletin board information of a shore station is monitored, may apply for a communication time slot and a frequency resource of the shore station, and establish a shipboard communication link according to the communication time slot and the frequency resource.
Optionally, in some possible embodiments, as shown in fig. 2, a communication link is established with a very high frequency low rail constellation system to perform communication, which specifically includes:
the VHF shipborne terminal listens to bulletin board information of a VHF satellite base station in a VHF low-rail constellation system, and judges whether a gateway station exists in the network coverage area of the VHF satellite base station according to the bulletin board information;
when a gateway station is arranged in the network coverage area of the very high frequency satellite base station, a communication link between the very high frequency shipborne terminal and the gateway station is established;
when no gateway station exists in the network coverage area of the very high frequency satellite base station, the route searches for the nearest adjacent gateway station in the same track through inter-satellite link transmission between the same track, and a communication link between the very high frequency shipborne terminal and the adjacent gateway station is established.
It should be understood that in the coverage area of the satellite-based network, the shipborne terminal can only relay communication through the satellite, select the satellite-based bulletin board information, and establish the satellite communication data link, in most cases, the satellite cannot be directly connected with the satellite gateway station in ocean-going sea, and can only transmit through the inter-satellite link between the same orbits, and the route searches for the gateway station which is available closest to the same orbit.
As shown in fig. 4, a schematic connection diagram is provided for an embodiment of a satellite hybrid networking communication system according to the present application, where the satellite hybrid networking communication system of the high frequency data exchange system includes: very high frequency low rail constellation system, very high frequency bank station and very high frequency on-board terminal, wherein:
the very high frequency low rail constellation system is used for communicating with a very high frequency shore station and a very high frequency shipborne terminal;
the VHF shipborne terminal is used for judging whether the VHF shipborne terminal is in the network coverage of the VHF shore station or not when the VHF communication is carried out; when the very high frequency shipborne terminal is not in the network coverage area of the very high frequency shore station, a communication link is established with the very high frequency low rail constellation system for communication.
As shown in fig. 4, the shore station and the low-orbit constellation system can realize data transmission with the big data cloud through the gateway, and the big data user can acquire data through the big data cloud.
It should be understood that the satellite hybrid networking communication system of the present application may be divided into a space segment, a user segment and a ground segment, as shown in fig. 5, where the space segment includes a plurality of traffic-specific satellites to form a very high frequency low-orbit constellation system, the traffic-specific satellites may communicate with each other through inter-satellite links, the user segment may include a plurality of very high frequency shipboard terminals to communicate with the traffic-specific satellites through the user links, the ground segment includes a plurality of ground gateway stations to communicate with the traffic-specific satellites through feeder links, and in addition, the ground segment may further be provided with a network control center for controlling the communication process, and the ground gateway stations may communicate with the network control center through a ground network dedicated line.
According to the satellite hybrid networking communication system provided by the embodiment, the very high frequency low-orbit constellation system is established, so that the shore base station, the satellite base station and the shipborne terminal form a unified system network, and the shore base and satellite base frequency resources are comprehensively allocated.
Optionally, in some possible embodiments, the very high frequency low rail constellation system includes: very high frequency satellite base stations with the same orbit height but at least three orbit inclinations, and the very high frequency satellite base stations with all orbit inclinations are used for covering all global ranges.
Optionally, in some possible embodiments, data transmission is performed between the vhf shore station, the vhf shipboard terminal and the vhf low rail constellation system through a preset radio frequency band.
Optionally, in some possible embodiments, the vhf on-board terminal is further configured to establish a communication link between the vhf on-board terminal and the target vhf shore station when within network coverage of the target vhf shore station.
Optionally, in some possible embodiments, the vhf shipborne terminal is specifically configured to listen to bulletin board information of a vhf satellite base station in the vhf low-rail constellation system, and determine whether a gateway station is in a network coverage area of the vhf satellite base station according to the bulletin board information; when a gateway station is arranged in the network coverage area of the very high frequency satellite base station, a communication link between the very high frequency shipborne terminal and the gateway station is established; when no gateway station exists in the network coverage area of the very high frequency satellite base station, the route searches for the nearest adjacent gateway station in the same track through inter-satellite link transmission between the same track, and a communication link between the very high frequency shipborne terminal and the adjacent gateway station is established.
It should be understood that the foregoing embodiments are product embodiments corresponding to the previous method embodiments, and the description of the product embodiments may refer to the description of the previous method embodiments, and will not be repeated herein.
It is understood that any combination of the above embodiments can be made by a person skilled in the art without departing from the concept of the application, and the combination is within the scope of the application.
The reader will appreciate that in the description of this specification, a description of terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the method embodiments described above are merely illustrative, e.g., the division of steps is merely a logical function division, and there may be additional divisions of actual implementation, e.g., multiple steps may be combined or integrated into another step, or some features may be omitted or not performed.
The above-described method, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application is essentially or a part contributing to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-only memory (ROM), a random access memory (RAM, randomAccessMemory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The present application is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present application, and these modifications and substitutions are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (8)
1. A satellite hybrid networking communication method for a very high frequency data exchange system, comprising:
establishing a very high frequency low-orbit constellation system which is communicated with a very high frequency shore station and a very high frequency shipborne terminal;
when the very high frequency shipborne terminal performs very high frequency communication, judging whether the very high frequency shipborne terminal is in the network coverage area of the very high frequency shore station or not;
when the very high frequency shipborne terminal is not in the network coverage area of the very high frequency shore station, a communication link is established with the very high frequency low rail constellation system for communication;
wherein, the very high frequency low rail constellation system includes: the very high frequency satellite base stations with the same orbit height but at least three orbit inclinations are used for covering all latitude ranges of the whole world.
2. The method for satellite hybrid networking of vhf data exchange system according to claim 1, wherein data transmission is performed among the vhf shore station, the vhf shipboard terminal and the vhf low orbit constellation system through a preset radio frequency band.
3. The method for satellite hybrid networking communication of a very high frequency data exchange system of claim 1, further comprising:
and when the very high frequency shipborne terminal is in the network coverage range of the target very high frequency shore station, establishing a communication link between the very high frequency shipborne terminal and the target very high frequency shore station.
4. A satellite hybrid networking communication method for a vhf data exchange system according to any one of claims 1 to 3, characterized by establishing a communication link with the vhf low orbit constellation system for communication, comprising in particular:
the VHF shipborne terminal listens to bulletin board information of a VHF satellite base station in the VHF low-rail constellation system, and judges whether a gateway station exists in the network coverage area of the VHF satellite base station according to the bulletin board information;
when a gateway station is arranged in the network coverage area of the very high frequency satellite base station, establishing a communication link between the very high frequency shipborne terminal and the gateway station;
when no gateway station exists in the network coverage area of the very high frequency satellite base station, the route searches for the adjacent gateway station nearest to the same track through inter-satellite link transmission between the same track, and a communication link between the very high frequency shipborne terminal and the adjacent gateway station is established.
5. A satellite hybrid networking communication system for a very high frequency data exchange system, comprising: very high frequency low rail constellation system, very high frequency bank station and very high frequency on-board terminal, wherein:
the very high frequency low rail constellation system is used for communicating with a very high frequency shore station and a very high frequency shipborne terminal;
the VHF shipborne terminal is used for judging whether the VHF shipborne terminal is in the network coverage range of the VHF shore station or not when the VHF communication is carried out; when the very high frequency shipborne terminal is not in the network coverage area of the very high frequency shore station, a communication link is established with the very high frequency low rail constellation system for communication;
wherein, the very high frequency low rail constellation system includes: the very high frequency satellite base stations with the same orbit height but at least three orbit inclinations are used for covering all latitude ranges of the whole world.
6. The system according to claim 5, wherein the vhf shore station, the vhf shipboard terminal, and the vhf low orbit constellation are configured to transmit data via a predetermined radio frequency band.
7. The system of claim 5, wherein the vhf on-board terminal is further configured to establish a communication link between the vhf on-board terminal and the target vhf shore when within network coverage of the target vhf shore.
8. The system according to any one of claims 5 to 7, wherein the vhf shipboard terminal is specifically configured to listen to bulletin board information of a vhf satellite base station in the vhf low orbit constellation system, and determine whether a gateway station is located in a network coverage area of the vhf satellite base station according to the bulletin board information; when a gateway station is arranged in the network coverage area of the very high frequency satellite base station, establishing a communication link between the very high frequency shipborne terminal and the gateway station; when no gateway station exists in the network coverage area of the very high frequency satellite base station, the route searches for the adjacent gateway station nearest to the same track through inter-satellite link transmission between the same track, and a communication link between the very high frequency shipborne terminal and the adjacent gateway station is established.
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