On-satellite autonomous random access and service method for satellite network in earth-moon space

Abstract

The invention discloses an on-satellite autonomous random access and service method for a satellite network in earth-moon space. A satellite antenna in a network node periodically scans the earth-moon airspace and broadcasts access information of a satellite in the space; after the user receives the satellite broadcast information, sending user access application information; the satellite network receives user condition access information and transmits application access information to the constellation network random access planning node; judging a service mode and service time of the user according to the user access application information, and generating user and guide star visibility information; the satellite performs service planning according to the user service application information and the visibility information and generates receipt information; the satellite network broadcasts receipt information to the user; and the user receives the satellite receipt and sends receipt confirmation information to perform service access. According to the random access service system constructed by the invention, the constellation is ensured to provide efficient and reliable communication and navigation services through the scheduling of earth-moon satellite network resources according to user requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of communication navigation in the terrestrial-lunar space, and in particular to an autonomous on-board random access and service method for a satellite network in the terrestrial-lunar space. Background Art

[0002] With the gradual development of space exploration activities, the current satellite network service scope has expanded from near-Earth space to deep space beyond the Earth, Moon and Moon. At present, the spacecraft services in the Earth-Moon space and beyond have the following characteristics: First, the service content is relatively simple, mainly focusing on measurement and control communications, which are used to ensure the normal operation of spacecraft and the return of business data; second, the service nodes are mainly ground stations, supplemented by near-Earth space satellites, and mainly provide services to users through near-Earth space (ground and geosynchronous orbit nodes); third, the application method is relatively simple, mostly through planned access, and users are served by pre-allocating resources to users through ground stations. However, with the increase in deep space exploration missions in the future, there will be huge changes in the service scope, the number of service users, and the service application method. It is necessary to build an Earth-Moon space communication and navigation network to provide Earth-Moon space users with diverse, easy-to-use, and high-quality Earth-Moon space communication and navigation services.

[0003] The integrated network of Earth-Moon space communication and navigation has the characteristics of "six complexities". First, the node categories are complex and there are many types of communication terminals carried on the nodes. Second, the networking form is complex. It not only needs to be able to meet the needs of link establishment between Earth-Moon space user satellites and communication and navigation satellites, but also needs to meet the needs of link establishment between inter-satellite links between communication and navigation satellites, and satellite-to-ground links between communication and navigation satellites and ground stations. Third, the integrated network of communication and navigation is dynamic in time and space, and the relative position relationship between satellites and between satellites and ground facilities is constantly changing. Fourth, node resources are limited. Due to the weight and volume of satellites, the number of antennas installed on each satellite is limited. Fifth, due to the development of aerospace-grade processors, the on-board computing power is also limited, and it is difficult to support on-board computing needs that are too complex or time-consuming. Sixth, it is necessary to take into account both measurement and communication needs. These characteristics have brought challenges to the network design of the Earth-Moon communication and navigation system. Traditional network design cannot effectively meet the multi-type service needs in the large-scale space of the Earth and the Moon.

[0004] In order to design a reasonable and feasible Earth-Moon space service network and maximize the system's functions under the constraints of limited space-based resources, it is necessary to monitor space-based resources at any time and process them in real time as much as possible. The traditional ground-based measurement and control service system and business management system are difficult to effectively solve the Earth-Moon network management problems. Frequent link interruptions, long and variable time delays, high bit error rates and packet loss rates, asymmetric uplink and downlink rates, and limited node resources have seriously tested the design capabilities of the Earth-Moon network. Summary of the invention

[0005] The present invention provides an autonomous on-board access and service method for a satellite network in cis-lunar space, and constructs a reasonable on-board access service system in response to the communication and navigation application requirements of cis-lunar space. According to user needs, the cis-lunar satellite network resources are dispatched to ensure that the constellation can provide efficient and reliable communication and navigation services.

[0006] In a first aspect, a satellite network autonomous on-board access and service method for Earth-Moon space is provided, comprising:

[0007] S1, the satellite antenna in the network node periodically scans the Earth-Moon space, broadcasts the access information of the satellite in space, and is used to receive the access information requested by the user;

[0008] S2, after the user receives the satellite broadcast information, calculates the relative direction and distance of the satellite to the user, confirms the satellite access receiving time slot, and then sends the user access application information;

[0009] S3: The satellite network receives the user's application for access and transmits the application for access to the node that can perform constellation network random access planning;

[0010] S4, judging the user's service mode and service time according to the user's access application information, and generating the user's and the communication guide satellite's visibility information; the satellite performs service planning according to the user's service application information and the user's and the satellite's visibility information, and generates receipt information;

[0011] S5, the satellite network broadcasts receipt information to the user;

[0012] S6, the user receives the satellite receipt in the regular receiving mode, sends the receipt confirmation information, extracts the satellite message to the user, extracts the planning results to the management and control system, and accesses the service; if the receipt information is received, the service starts for the user; if the satellite does not receive the receipt information, the allocated service time slot is recovered for other planning.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the information broadcast in step S1 includes satellite ID, scanning wave position information, the time of the next scan to the wave position, and each node telegram; in step S1, a transmit and receive duplex time slot is used, the transmit time slot is used for one-way navigation information and satellite simplified almanac information broadcasting, and the receive time slot is used for receiving user access application information.

[0014] In combination with the first aspect, in certain implementations of the first aspect, in step S2, after receiving the communication guide satellite broadcast signal, the user parses the broadcast signal and obtains the next broadcast time slot of the broadcast signal; when the next broadcast signal is broadcast, the user provides service application information, and the application information includes the signal broadcast time, the communication guide satellite ID of the broadcast destination, the user's orbital information, the user's application service type, and the user's application service start time.

[0015] In combination with the first aspect, in certain implementations of the first aspect, in step S3, for a distributed network, the access application information is synchronized to the entire network; for a centralized network, the access application information is transmitted to a core node.

[0016] In combination with the first aspect, in some implementations of the first aspect, in step S4, judging the service mode and service time of the user according to the user application access information, and generating the user and the communication guide star visibility information, including:

[0017] Each satellite receives the user's application information, extracts the user's satellite status information, and performs user orbit prediction;

[0018] Satellite orbit prediction is performed based on the satellite’s own orbit information stored on board;

[0019] Unify the satellite orbit prediction and user orbit prediction results to generate future visibility information of users and satellites;

[0020] Step S4 also includes:

[0021] According to the link planning results, a routing table in the network is generated, which includes multiple rows of routing table entries. Each row of routing table entries is used to indicate that a data frame is sent from a source node x to a destination node y, and the source node x transfers the data frame to the next hop node z through the transmitting antenna k. The receiving antenna of the next hop node z is labeled n.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the rule for querying the continuous link routing table is that if the source node label in the routing table entry is the same as the label of the local satellite, and the destination node label in the routing table entry is the same as the destination node label of the data frame, the data frame is sent to the next hop node z via the antenna k of the local satellite, where the next hop node z uses antenna n to receive the data frame.

[0023] In combination with the first aspect, in certain implementations of the first aspect, the time-division link routing table is also used to indicate the routing activation time t; the rule for querying the time-division link routing table entry is that if the source node label in the routing table entry is the same as the label of the local satellite, the destination node label in the routing table entry is the same as the destination node label of the data frame, and the current time is the routing table activation time, the data frame is sent to the next hop node z via the antenna k of the local satellite, where the next hop node z uses antenna n to receive the data frame.

[0024] In combination with the first aspect, in certain implementations of the first aspect, in step S5, the time-division link planning result receipt includes:

[0025] Planning table number, number of time slots, source node number, planning table effective time, planning table duration, N time slot service information, each time slot service information includes the time slot start time, time slot length, transmitting antenna number, target node, receiving and transmitting status, and service rate.

[0026] In combination with the first aspect, in certain implementations of the first aspect, in step S5, the time-division link planning result receipt includes: the number of link building planning targets, the source node, the channel ID, the effective time point of the planning table, the duration of the planning table, and M link building target information. Each link building target information includes the link building target service start time, the link building target service duration, the target node, the target identification word, and the service rate.

[0027] In combination with the first aspect, in some implementations of the first aspect, in step S6, the satellite provides a service to the user, wherein for a time-division link, the user adopts a user-send-first-receive-later mode according to a satellite planning result, estimates the orbit information of the transmitting satellite and the receiving satellite, calculates the distance between the transmitting and receiving satellites, and obtains the propagation delay t between the transmitting and receiving parties. Broadcast ; Based on the propagation delay, the transmission time slot is advanced by t Broadcast , receiving time slot lag t Broadcast .

[0028] Compared with the prior art, the solution provided by the present invention includes at least the following beneficial technical effects:

[0029] (1) The present invention realizes random access for users in the cis-lunar space, can support manned and unmanned deep space exploration missions in the cis-lunar space, and comprehensively improves the autonomy and flexibility of user services.

[0030] (2) The random access method of the present invention is applicable to random access of various links such as time-division links and continuous links.

[0031] (3) Through this ad hoc access method, users can apply for communications, navigation, measurement and control and other services from the Earth-Moon space infrastructure, which will serve as an effective support for the construction of future Earth-Moon space infrastructure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The present invention is a flow chart of an autonomous on-board access and service method for a satellite network in cis-lunar space.

[0033] Figure 2 This is a schematic diagram of the scanning wave position. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1As shown, the present invention provides an autonomous on-board access and service method for a satellite network in Earth-Moon space, comprising the following steps.

[0036] S1, the satellite antenna in the network node periodically scans the Earth-Moon space and broadcasts the access information of the satellite in space to receive the access information requested by the user.

[0037] The broadcast signal contains satellite ID, scanning wave position information, the next scanning wave position time, and each node message. It adopts the duplex time slot, the transmitting time slot is used for one-way navigation information and satellite simplified almanac information broadcasting, and the receiving time slot is used for receiving user access application information. Figure 2 Taking the satellite deployed at the Earth-Moon Lagrange L4 point as an example, the scanning wave position style is demonstrated. (Note: The wave position coordinates have the ability to be configured on demand, and the wave position can be freely configured according to user needs).

[0038] S2: After the user receives the satellite broadcast information, calculates the relative direction and distance of the satellite to the user, confirms the satellite access receiving time slot, and then sends the user access application information.

[0039] Specifically, after receiving the communication satellite broadcast signal, the user parses the broadcast signal and obtains the next broadcast time slot of the broadcast signal; 2) when the next broadcast signal is broadcast, the user provides service application information, and the application information includes the signal broadcast time, the broadcast destination communication satellite ID, the user's orbital information, the user's application service type, and the user's application service start time.

[0040] S3: The satellite network receives the user's application for access and transmits the application for access to the node that can perform constellation network random access planning.

[0041] For distributed networks, the access application information will be synchronized to the entire network to ensure that the initial information for planning the entire network is exactly the same; for centralized networks, the access application information will be transmitted to the core node.

[0042] S4, according to the user's application access information, determine the user's service mode and service time, and generate the user and the communication satellite visibility information. The satellite performs service planning based on the user's service application information and the user and satellite visibility information, and generates receipt information. The specific steps are as follows.

[0043] 1) Each satellite receives the user's application information, extracts the user's satellite status information, and performs user orbit prediction;

[0044] 2) Predict the satellite orbit based on the satellite’s own orbit information stored on board.

[0045] 3) Unify the satellite orbit prediction and user orbit prediction results to generate future visibility information of users and satellites.

[0046] 4) The satellite performs service planning based on user service application information and user and satellite visibility information. For distributed networks, the planning results will be synchronized to the entire network to ensure that the entire network planning results are announced to the entire network. For centralized networks, the planning results will be distributed to the entire network by the core nodes.

[0047] 5) Generate a routing table in the network based on the link planning results. A routing table includes multiple rows of routing table entries. The meaning of each row of routing table entries is that if a data frame needs to be sent from source node x to destination node y, the source node x needs to transfer the data frame to the next hop node z through the transmitting antenna k. The receiving antenna of the next hop node z is numbered n. The last column is the time to enable the routing information. If it is a continuous link routing table, there is no last column. The time-division link routing table is shown in Table 1, and the continuous link routing table is shown in Table 2.

[0048] Table 1 Continuous link routing table

[0049]

[0050] Table 2 Time-division link routing table

[0051]

[0052] When querying the continuous link routing table entry, the query rule is that if the source node label in the routing table entry is the same as the label of the local satellite, and the destination node label in the routing table entry is the same as the destination node label of the data frame, the data frame will be sent to the next hop node z through the antenna k of the local satellite, where the next hop node z uses antenna n to receive the data frame.

[0053] When querying the time-division link routing table entry, the query rule is that if the source node label in the routing table entry is the same as the label of the local satellite, the destination node label in the routing table entry is the same as the destination node label of the data frame, and the current time is the routing table activation time, the data frame will be sent to the next hop node z through the antenna k of the local satellite, where the next hop node z uses antenna n to receive the data frame.

[0054] S5, the satellite network broadcasts receipt information to the user.

[0055] For time-division links, the main task is to plan the time slot resources of the entire network. The planning receipt results are shown in Table 3.

[0056] For continuous links, the link and beam resources of the entire network are planned to generate planning results for sustainable link establishment. The planning receipt results are shown in Table 4.

[0057] Table 3 Time-division link planning result receipt

[0058]

[0059] Table 4 Continuous link planning result receipt

[0060]

[0061] S6, the user receives the satellite receipt in the regular receiving mode, sends the receipt confirmation information, extracts the satellite message to the user, extracts the planning results to the management and control system, and accesses the service; if the satellite does not receive the receipt information, it recycles the allocated service time slot for other planning. If the receipt information is received, the service starts for the user.

[0062] S7, satellite provides services to users.

[0063] For time-division links, users adopt the mode of sending first and receiving later according to the satellite planning results. By estimating the orbit information of the transmitting and receiving satellites, calculating the distance between the transmitting and receiving satellites, and processing the speed of light, the rough propagation delay t between the sending and receiving parties can be obtained. Broadcast Based on the propagation delay, the transmission time slot is advanced by t Broadcast , receiving time slot lag t Broadcast , ensuring that the user's transmission and reception can be aligned with the satellite's transmission and reception time slots.

[0064] Although the present invention is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. An autonomous on-board access and service method for a satellite network in Earth-Moon space, characterized in that: include: S1, the satellite antenna in the network node periodically scans the Earth-Moon space, broadcasts the access information of the satellite in space, and is used to receive the access information requested by the user; S2, after the user receives the satellite broadcast information, calculates the relative direction and distance of the satellite to the user, confirms the satellite access receiving time slot, and then sends the user access application information; S3: The satellite network receives the user's application for access and transmits the application for access to the node that can perform constellation network random access planning; S4, judging the user's service mode and service time according to the user's access application information, and generating the user's and the communication guide satellite's visibility information; the satellite performs service planning according to the user's service application information and the user's and the satellite's visibility information, and generates receipt information; S5, the satellite network broadcasts receipt information to the user; S6, the user receives the satellite receipt in the regular receiving mode, sends the receipt confirmation information, extracts the satellite message to the user, extracts the planning results to the management and control system, and accesses the service; If the receipt information is received, the service will be started for the user; if the satellite receiver does not receive the receipt information, the allocated service time slot will be recovered for other planning.

2. The method according to claim 1, characterized in that: The information broadcast in step S1 includes satellite ID, scanning wave position information, the time of the next scan to the wave position, and each node message; in step S1, a transceiver duplex time slot is used, the transmitting time slot is used for one-way navigation information and satellite simplified almanac information broadcasting, and the receiving time slot is used for receiving user access application information.

3. The method according to claim 1, characterized in that In step S2, after receiving the communication satellite broadcast signal, the user parses the broadcast signal and obtains the next broadcast time slot of the broadcast signal; when the next broadcast signal is broadcast, the user provides service application information, and the application information includes the signal broadcast time, the broadcast target communication satellite ID, the user's orbital information, the user's application service type, and the user's application service start time.

4. The method according to claim 1, characterized in that In step S3, for a distributed network, the access application information is synchronized to the entire network; for a centralized network, the access application information is transmitted to the core node.

5. The method according to claim 1, characterized in that In step S4, the service mode and service time of the user are determined according to the user's application access information, and the visibility information of the user and the communication guide star is generated, including: Each satellite receives the user's application information, extracts the user's satellite status information, and performs user orbit prediction; Satellite orbit prediction is performed based on the satellite’s own orbit information stored on board; Unify the satellite orbit prediction and user orbit prediction results to generate future visibility information of users and satellites; Step S4 also includes: According to the link planning results, a routing table in the network is generated, which includes multiple rows of routing table entries. Each row of routing table entries is used to indicate that a data frame is sent from a source node x to a destination node y, and the source node x transfers the data frame to the next hop node z through the transmitting antenna k. The receiving antenna of the next hop node z is labeled n.

6. The method according to claim 1, characterized in that The rule for querying the continuous link routing table is that if the source node label in the routing table entry is the same as the label of the local satellite, and the destination node label in the routing table entry is the same as the destination node label of the data frame, the data frame will be sent to the next hop node z through the antenna k of the local satellite, where the next hop node z uses antenna n to receive the data frame.

7. The method according to claim 1, characterized in that The time-division link routing table is also used to indicate the routing activation time t; the rule for querying the time-division link routing table entry is that if the source node label in the routing table entry is the same as the label of the local satellite, the destination node label in the routing table entry is the same as the destination node label of the data frame, and the current time is the routing table activation time, the data frame is sent to the next hop node z through the antenna k of the local satellite, where the next hop node z uses antenna n to receive the data frame.

8. The method according to claim 1, characterized in that: In step S5, the time-division link planning result receipt includes: Planning table number, number of time slots, source node number, planning table effective time, planning table duration, N time slot service information, each time slot service information includes the time slot start time, time slot length, transmitting antenna number, target node, receiving and transmitting status, and service rate.

9. The method according to claim 1, characterized in that: In step S5, the time-division link planning result receipt includes: the number of link building planning targets, source node, channel ID, planning table effective time point, planning table duration, M link building target information, each link building target information includes the link building target service start time, link building target service duration, target node, target identification word, and service rate.

10. The method according to claim 1, characterized in that In step S6, the satellite provides services to the user. For the time-division link, the user adopts the mode of sending first and receiving later according to the satellite planning results, estimates the orbit information of the transmitting satellite and the receiving satellite, calculates the distance between the transmitting and receiving satellites, and obtains the propagation delay t between the transmitting and receiving parties. Broadcast ; Based on the propagation delay, the transmission time slot is advanced by t Broadcast , receiving time slot lag t Broadcast .

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