CN115133980A - Method, system and computer readable medium for detecting satellite network node fault - Google Patents
Method, system and computer readable medium for detecting satellite network node fault Download PDFInfo
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Abstract
The invention relates to a method, a system and a computer readable medium for detecting satellite network node faults. The satellite network comprises a first satellite and a plurality of second satellites, and the detection method comprises the following steps: each second satellite and the first satellite establish an inter-satellite link; each second satellite monitors the establishment process of the inter-satellite link, and when the establishment process of the inter-satellite link is abnormal, the second satellite records the state of the first satellite as a possible fault state; the second satellite initiates broadcasting to all satellites in the satellite network, and the broadcast information comprises the possible fault state of the first satellite; and each satellite in the satellite network records the number of the received possible fault states, and when the number reaches a preset threshold value, each satellite in the satellite network records the state of the first satellite as the fault state. According to the invention, in a multi-node satellite network based on time division space division multiplexing, autonomous detection and treatment are carried out on the availability of satellite nodes, and the influence domain is reduced.
Description
Technical Field
The invention mainly relates to the field of intelligent operation of satellite constellation networks in aerospace, in particular to a method and a system for detecting a satellite network node fault and a computer readable medium.
Background
With the increase of service demands of Global communication, navigation, remote sensing, etc., many countries and organizations have actively deployed and constructed satellite networks that can cover the world, such as iridium satellite System, GPS (Global Positioning System), beidou System, StarLink (star link plan), etc. In order to realize all-weather operation control and global service data transmission of the satellite, the satellite is provided with special inter-satellite link loads, such as a parabolic antenna, a phased array antenna, a laser communication terminal and other equipment, a wireless inter-satellite link is established between the satellite and the satellite, and then all the satellites are connected in series to form a satellite network.
Currently, satellite networks have several communication forms: a polling broadcast mode represented by a GPS system, wherein satellites in a satellite network alternately transmit broad-beam broadcast signals according to a time beat, and the rest satellites receive the signals; secondly, a time division space division multiplexing electric scanning phased array mode represented by a Beidou system is adopted, satellites in a satellite network send narrow beam signals to different satellites in different time slices according to the plan of a ground control center, and the connection state of the whole satellite network is continuously switched along with time; third, a laser inter-satellite link system represented by StarLink is used, and the satellites are connected by relatively fixed laser signals.
The above satellite network forms have various characteristics, but the operation performance of the satellite network is affected by the failure of the satellite nodes in the satellite network. In particular, in a time division system satellite network, because all satellites in the satellite network continuously switch the pointing direction and the connection relation of signals according to second-level time slices, when a certain satellite node in the satellite network fails, a data transmission path planned in advance by a ground control center is greatly affected, and therefore the failed satellite node needs to be identified in time, a data path needs to be planned again, and the failed satellite needs to be isolated.
At present, the main methods adopted for monitoring and handling the availability state of the satellite node are as follows: and the ground control center monitors the states of all satellites in the satellite network, and when the satellite nodes are found to have faults and the faults cannot be eliminated in a short period, the ground control center plans the connection relation and the data path of the satellite network again, injects instruction data to the satellites and isolates the faulty satellites. The method has the obvious defects that firstly, a ground control center is required to monitor the health state of all satellites in a satellite network all day long, corresponding manpower and material resources are required to guarantee, the operation of the satellite network depends heavily on the control of the ground control center, and intelligent autonomous operation cannot be realized; and secondly, when the satellite node fails, the ground control center is required to recalculate the connection relation and the data transmission path between the satellites and update all the satellites, so that the response speed is low.
Disclosure of Invention
The technical problem to be solved by the application is to provide a method, a system and a computer readable medium for detecting satellite network node faults, wherein in a multi-node satellite network based on time division and space division multiplexing, the availability of satellite nodes is autonomously detected and treated, the satellite network can intelligently identify the faulty satellite nodes, and the faulty satellite nodes are automatically isolated in the running process of the satellite network, so that the influence domain is reduced.
The technical solution adopted by the present application to solve the above technical problem is a method for detecting a node fault in a satellite network, where the satellite network includes a first satellite and a plurality of second satellites, and includes: each second satellite and the first satellite establish an inter-satellite link; each second satellite monitors the establishment process of the inter-satellite link, and when the establishment process of the inter-satellite link is abnormal, the second satellite records the state of the first satellite as a possible fault state; the second satellite initiates broadcasting to all satellites in the satellite network, and the broadcast information comprises the possible fault state of the first satellite; and each satellite in the satellite network records the number of the received possible fault states, and when the number reaches a preset threshold value, each satellite in the satellite network records the state of the first satellite as the fault state.
In an embodiment of the present application, the step of the second satellite initiating a broadcast to all satellites in the satellite network comprises: the broadcasting mode comprises flood broadcasting to a satellite network, the broadcasting information of the flood broadcasting comprises survival hop number control words, the survival hop number control words are automatically reduced by one after passing through the satellite, and when the survival hop number control words are zero, the broadcasting information is automatically lost.
In an embodiment of the present application, the step of establishing an inter-satellite link between each second satellite and the first satellite includes: and the first satellite establishes an inter-satellite link with each second satellite respectively according to a time division polling mode.
In an embodiment of the present application, each satellite in the satellite network includes a link establishment schedule, the link establishment schedule includes an inter-satellite link plan for each satellite to establish a pairing with a different satellite, and the step of establishing an inter-satellite link between each second satellite and the first satellite includes: and each second satellite establishes an inter-satellite link with the first satellite according to the link establishment schedule.
In one embodiment of the present application, each satellite in the satellite network includes a network node availability table, the network node availability table includes an availability status of each satellite in the satellite network, the availability status includes available or unavailable, each second satellite determines whether to establish an inter-satellite link with the first satellite according to the network node availability table, and when the availability status of the first satellite in the network node availability table of the second satellite itself is available, the second satellite establishes an inter-satellite link with the first satellite.
In an embodiment of the present application, when each satellite in the satellite network records that the state of the first satellite is the failure state, each satellite in the satellite network updates the availability state of the first satellite in its own network node availability table to be unavailable.
In an embodiment of the present application, the step of establishing an inter-satellite link between each second satellite and the first satellite includes: the second satellite establishes an inter-satellite link with the first satellite for a preset number of times in the first period.
In an embodiment of the present application, the step of determining that an inter-satellite link establishment process is abnormal includes: the second satellite is unsuccessful in establishing the inter-satellite link with the first satellite for a preset number of times in the first period.
In an embodiment of the present application, after the step of recording, by each satellite in the satellite network, that the state of the first satellite is the failure state, the method further includes: each satellite in the satellite network does not establish an inter-satellite link with the first satellite.
In an embodiment of the present application, after the step of recording, by each satellite in the satellite network, that the state of the first satellite is the failure state, the method further includes: each satellite in the satellite network does not generate data destined for the first satellite.
In an embodiment of the present application, after the step of recording, by each satellite in the satellite network, that the state of the first satellite is the failure state, the method further includes: each satellite in the satellite network does not forward data through the first satellite.
In an embodiment of the present application, after the step of recording, by each satellite in the satellite network, that the state of the first satellite is the failure state, the method further includes: each satellite in the satellite network discards data destined for the first satellite.
The present application further provides a system for detecting a satellite network node fault, which includes: a memory for storing instructions executable by the processor; and a processor for executing instructions to implement the method for detecting a satellite network node failure as above.
The present application further provides a computer readable medium storing a computer program code, which when executed by a processor implements the above method for detecting a failure of a satellite network node.
According to the technical scheme, in the process of establishing the inter-satellite link between the second satellite and the first satellite, the second satellite can preliminarily judge whether the first satellite has a fault according to the link establishment condition, and preliminary autonomous detection is achieved; if the second satellite judges that the first satellite is possibly in fault, the second satellite broadcasts the information that the first satellite is possibly in fault to other satellites in the satellite network, and when each satellite in the satellite network receives the information that the first satellite is possibly in fault and the broadcast information reaches a certain amount, each satellite in the satellite network performs multi-party confirmation according to the broadcast information, and finally the first satellite is determined to be in a fault state. The method for repeatedly judging and confirming can avoid misjudgment, the satellite can autonomously and correctly detect the fault node in the satellite network, and resources of a ground control center are saved.
The invention has the advantages that: the situation of the built link satellite is monitored by satellites in the satellite network based on the time division system, flooding broadcast early warning of the satellite with possible fault is automatically initiated, all satellite nodes in the satellite network judge whether the satellite has the fault or not by adopting a voting mode based on broadcast information, and the fault satellite is automatically isolated. The satellite network fault node automatic detection and treatment are realized, the satellite node can automatically shield a fault data transmission path to isolate a fault satellite after a certain node in the satellite network has a fault without depending on the processing of a ground control center, and the intelligent operation level of the satellite network is improved.
Drawings
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, wherein:
fig. 1 is an exemplary flow chart of a method for detecting a satellite network node failure according to an embodiment of the present application;
FIG. 2 is an exemplary diagram of a network node availability table according to one embodiment of the present application;
FIG. 3 is an exemplary flow chart of a method for detecting a satellite network node failure according to an embodiment of the present application;
fig. 4 is a system block diagram of a system for detecting a satellite network node failure according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments disclosed below.
As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" are intended to cover only the explicitly identified steps or elements as not constituting an exclusive list and that the method or apparatus may comprise further steps or elements.
Flowcharts are used herein to illustrate the operations performed by systems according to embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed in the exact order in which they are performed. Rather, various steps may be processed in reverse order or simultaneously. Meanwhile, other operations are added to or removed from these processes.
The application provides a method for detecting a node failure of a satellite network, wherein the satellite network comprises a first satellite and a plurality of second satellites, and illustratively, in some cases, the first satellite is a failed satellite and the second satellites are non-failed satellites. It should be noted that the second satellite in this application refers to a satellite that needs to establish an inter-satellite link with the first satellite.
The method for detecting the satellite network node fault is mainly applied to a communication scene among satellites in a multi-node satellite network based on time division space division multiplexing. It should be noted that the method of the present application may be implemented in a constellation of navigation satellites. In some embodiments, the method of the present application may also be performed in a plurality of constellations of navigation satellites having communication connections with each other, and the present application is not limited thereto. In a multi-node satellite network based on time division and space division multiplexing, the time division multiplexing comprises the step that a satellite sends signals to different satellites in different time slices, the connection state of the whole satellite network is continuously switched along with time, and the space division multiplexing comprises the connection among different satellites and different directed airspaces. The method can realize the autonomous control of the space-based satellite, does not need the manual intervention of a ground control center, and improves the intelligent operation level of the satellite network.
Fig. 1 is an exemplary flowchart of a method for detecting a satellite network node fault according to an embodiment of the present application, and referring to fig. 1, the method for detecting a satellite network node fault according to the embodiment includes the following steps:
step S110: each second satellite establishes an inter-satellite link with the first satellite.
Step S120: and each second satellite monitors the establishment process of the inter-satellite link, and when the establishment process of the inter-satellite link is abnormal, the second satellite records the state of the first satellite as a possible fault state.
Step S130: the second satellite initiates a broadcast to all satellites in the satellite network, the broadcast information including a possible fault condition of the first satellite.
Step S140: each satellite in the satellite network records the number of received possible fault states, and when the number reaches a preset threshold value, each satellite in the satellite network records the state of the first satellite as a fault state.
The above steps S110 to S140 will be described in detail.
In step S110, each second satellite establishes an inter-satellite link with the first satellite.
The communication between the satellites needs to be established, the inter-satellite link comprises a wireless link with data transmission and ranging functions between the satellites, and the inter-satellite link enables a plurality of satellites to form an organic whole to form a constellation system, so that the working capacity of a single satellite can be expanded.
In some embodiments, the step of establishing an inter-satellite link with the first satellite by each second satellite comprises: and the first satellite establishes an inter-satellite link with each second satellite respectively according to a time-division polling mode.
The first satellite establishes a link with each second satellite in the plan in a time-division polling mode according to the plan of the ground control center, wherein the time-division polling mode comprises that the first satellite establishes an inter-satellite link with only a single second satellite in a time slice (for example, a time period of 3 seconds), the time slice is a minimum working time period of the satellite, and the first satellite polls the next second satellite to establish the link no matter the first satellite and the second satellite which needs to establish the link at present succeed or fail, the time slice is used up. The inter-satellite link is efficiently established between the first satellite and the second satellite needing to establish the link according to the plan of the ground control center by adopting a time-division polling mode, so that the problem that subsequent link establishment tasks cannot be completed due to repeated attempts for a long time when the link establishment between the first satellite and a certain satellite node fails can be avoided, and meanwhile, the transmission of data in a satellite network is completed.
In some embodiments, each satellite in the satellite network includes a link establishment schedule including an inter-satellite link schedule for each satellite establishing a pairing with a different satellite, the step of each second satellite establishing an inter-satellite link with the first satellite including: and each second satellite establishes an inter-satellite link with the first satellite according to the link establishment schedule.
The ground control center sets a link establishment schedule for each satellite, and each second satellite in the satellite network judges whether to establish an inter-satellite link with the first satellite according to the content of the link establishment schedule. The link establishment schedule is set for each satellite, so that the link establishment work among the satellites can be carried out in order, and the occurrence of link establishment errors is avoided.
Illustratively, taking a time division system satellite network of a Beidou navigation satellite as an example, each satellite is provided with Ka-band phased array equipment, according to a link establishment planning table planned in advance by a ground control center, the satellite continuously switches signal direction according to a time slice of 3 seconds, paired inter-satellite links are established with different satellites, and satellites in the whole satellite network cooperatively work according to the mode, so that a time-varying space-division multiplexing satellite network is established. And the service data is transmitted in the satellite network according to a path planned in advance by the ground control center.
Fig. 2 is an exemplary diagram of a network node availability table according to an embodiment of the present application.
In some embodiments, each satellite in the network of satellites includes a network node availability table including an availability status of each satellite in the network of satellites, the availability status including available or unavailable, each second satellite determines whether to establish an inter-satellite link with the first satellite based on the network node availability table, and the second satellite establishes an inter-satellite link with the first satellite when the availability status of the first satellite in its own network node availability table is available.
Illustratively, referring to fig. 2, each satellite in the satellite network stores a network node availability table 200, and the network node availability table 200 is a table, that is, each satellite stores a table having elements of a node number 210, a satellite number 220, a satellite type 230, a satellite availability 240, and the like, wherein the availability status of the satellite availability 240 includes available 241 or unavailable 242. In the network node availability table 200, for a certain satellite, the availability status of the satellite availability 240 can only exist in one of two states, available 241 and unavailable 242. The elements in the network node availability table 200 describe the availability status of all satellite nodes in the satellite network.
Typically, the network node availability table 200 is maintained by a ground control center, which maintains the table by collecting the status of each satellite, network entry or network exit plans, and transmits the network node availability table 200 to all satellites in the satellite network by means of instruction injection.
Each second satellite determines whether to establish an inter-satellite link with the first satellite based on the satellite availability 240 in the network node availability table 200, and establishes an inter-satellite link with the first satellite when the availability status of the first satellite in the network node availability table 200 stored by the second satellite itself is available 241. When a second satellite in the satellite network autonomously determines that a satellite, for example, the first satellite, has a "failed" status, the second satellite autonomously maintains its stored network node availability table 200, and the second satellite automatically updates 242 the availability status of the failed satellite in the network node availability table 200 to unavailable.
The second satellite can obtain the availability state of each other satellite in the satellite network by retrieving the network node availability table 200 stored by the second satellite, so that autonomous judgment is realized, and the resources of the ground control center are saved.
In some embodiments, the step of establishing an inter-satellite link with the first satellite by each second satellite comprises: the second satellite establishes an inter-satellite link with the first satellite continuously according to preset times in the first period.
In the process of establishing the inter-satellite link between the second satellite and the first satellite, a certain link establishment condition is set for the link establishment process, so that the second satellite continuously establishes the inter-satellite link with the first satellite according to a certain number of times only in a period of time (namely a first period), and the problem that the subsequent link establishment task with other satellites cannot be completed because the second satellite always tries to establish the link with the first satellite endlessly after the current link establishment fails is avoided. And the second satellite can finally complete all link establishment tasks according to the planning of the ground control center, so that the satellite network can normally operate.
In step S120, each second satellite monitors the establishment process of the inter-satellite link, and when the establishment process of the inter-satellite link is abnormal, the second satellite records the state of the first satellite as a possible failure state.
In the process of establishing the inter-satellite link between the second satellite and the first satellite, the link between the second satellite and the first satellite is not established successfully, the establishment process of the inter-satellite link is abnormal, the second satellite preliminarily judges that the first satellite has a fault, and the second satellite records the possible fault state of the first satellite, so that the second satellite can conveniently and repeatedly judge subsequently to confirm whether the first satellite has a fault indeed.
In some embodiments, in step S120, the step of determining that an abnormality occurs in the process of establishing the inter-satellite link includes: the second satellite is unsuccessful in establishing the inter-satellite link with the first satellite for a preset number of times in the first period.
For example, the step S120 may be used as a step of monitoring a link establishment failure of a link between satellites, a first period in the step S120 is 1 minute, and the preset number of times is 2 times, and in the process of monitoring the link establishment failure of the link between satellites, if a second satellite does not establish a link with a first satellite for 2 consecutive times within 1 minute, the second satellite marks a first satellite needing to establish a link as a "possible failure" state. The second satellite can timely find the abnormal link establishment with the first satellite according to a preset first period and preset times, so that subsequent disposal is facilitated, and the second satellite can complete all link establishment tasks according to the planning of the ground control center, so that the satellite network can normally operate.
In step S130, the second satellite initiates a broadcast to all satellites in the satellite network, the broadcast information including a possible fault state of the first satellite.
Illustratively, the second satellite transmits the broadcast information to all satellites in the satellite network in a broadcast mode, and when the second satellite judges that the state of the first satellite is a possible fault state, the broadcast information sent by the second satellite can reach all satellites in the satellite network in time, so that the communication efficiency between the satellites is improved.
In some embodiments, the step S130 of initiating broadcasting by the second satellite to all satellites in the satellite network includes: the broadcasting mode comprises flood broadcasting to a satellite network, broadcasting information of the flood broadcasting comprises survival hop count control words, the survival hop count control words are automatically reduced by one every time the survival hop count control words are transmitted by the satellite, and when the survival hop count control words are zero, the broadcasting information is automatically lost.
Illustratively, the step S130 may be used as a fault warning flooding broadcasting step. In the process of broadcasting the fault early warning flood, the second satellite marks the satellite number of the first satellite in the possible fault state to initiate the flood broadcasting of the full satellite network. It should be noted that, in the process of transmitting the broadcast information to all the satellites in the satellite network by the second satellite through the flood broadcast, the object of the flood broadcast does not include the second satellite itself. In the process of flood broadcasting, since a large amount of broadcast information may exist in the satellite network, a "broadcast storm" may occur when a large amount of broadcast information occurs in the satellite network for a long time. That is, when a broadcast storm occurs, the data transmission bandwidth of the satellite network is occupied by a large amount of broadcast information for a long time, normal point-to-point communication between the satellites cannot be performed normally, and the operation condition of the whole satellite network is affected.
The number of satellites in the whole satellite network is large, the distribution of the satellites covers the whole world, the satellites move around the earth when in work, some satellites are distributed on the back of the earth, the satellites cannot be directly communicated sometimes due to the fact that the earth shields the satellites, and for the satellites which cannot be directly communicated mutually, information needs to be forwarded through other intermediate satellites in the communication process to assist in information transmission. In the process of forwarding the broadcast information between the satellites, a survival hop count control word may be set, and the survival hop count control word has a value of, for example, the maximum number of times that the broadcast information needs to be forwarded. For example, if the satellite a needs to broadcast information to all satellites in the satellite network, the longest transmission path in the information transmission process needs x satellites to forward to reach all satellites in the satellite network, and the value of the survival hop count control word included in the information broadcast by the satellite a is x.
In some embodiments, when the second satellite initiates a flood broadcast to all satellites in the satellite network, the flood broadcast information includes a "survival hop count" control word, which is automatically reduced by one every time the survival hop count control word passes through the satellite, and when the survival hop count control word is reduced to zero, the flood broadcast information is automatically lost, and by setting the survival hop count control word, a "broadcast storm" can be avoided during communication of the satellite network, and communication between satellites in the satellite network can be enabled to operate normally.
In step S140, each satellite in the satellite network records the number of possible fault states received, and when the number reaches a preset threshold, each satellite in the satellite network records the state of the first satellite as a fault state.
Illustratively, the step S140 may be used as a voting judgment step. Setting the preset threshold value in step S140 to m, in the voting judgment process, after the second satellite receives the failure early warning flood broadcast, recording the number of the initiating satellite receiving the flood broadcast, knowing that the same satellite at least establishes an inter-satellite link with N different satellites within one link establishment period (e.g., 1 minute), and when the second satellite receives the failure early warning flood broadcast information of the same satellite from m satellites, that is, the number of the "possible failure" states received by the second satellite is m, and reaches the preset threshold value m, the second satellite marks the satellite as the "failure" state. In some embodiments, the preset threshold in step S140 may further include a "possible fault state" that the second satellite itself has recorded, and the preset threshold may be set autonomously as needed, which is not limited in this application.
Illustratively, through the foregoing step S130, each satellite in the satellite network receives the fault warning flood broadcast, and records the number of received possible fault states, and when the number reaches a preset threshold, each satellite in the satellite network marks the first satellite as a "fault" state. For the second satellite, the second satellite performs repeated confirmation by performing step S140, and the state of the first satellite can be correctly determined by combining the broadcast information of other satellites, so as to avoid erroneous determination.
In some embodiments, in step S140, when each satellite in the satellite network records the state of the first satellite as a failure state, each satellite in the satellite network updates the availability state of the first satellite in its network node availability table to unavailable.
Illustratively, referring to FIG. 2, when each satellite in the satellite network records the first satellite as a "failed" state, each satellite updates 242 its own network node availability table 200 regarding the availability status of the first satellite as unavailable. For example, in a satellite network, when a second satellite determines and records that a first satellite is in a "failed" state, the second satellite automatically updates 242 the availability status of the failed satellite within its network node availability table 200 to unavailable. The content of the network node availability table 200 of the second satellite is updated and maintained autonomously by the second satellite, and the subsequent second satellite can directly read the content of the network node availability table 200 to judge the availability state of each satellite in the satellite network in real time, so that a link establishment task with each satellite is carried out, the resources of a ground control center are saved, and meanwhile, the ground control center can also check and analyze the content of the network node availability table 200, thereby facilitating the further planning of satellite work tasks.
In some embodiments, the step S140, after the step of recording, by each satellite in the satellite network, that the state of the first satellite is the failure state, further includes: each satellite in the satellite network does not establish an inter-satellite link with the first satellite.
Illustratively, referring to fig. 2, each satellite in the satellite network does not establish an inter-satellite link with a first satellite whose availability status is unavailable 242 within its network node availability table 200. By the aid of the disposal means, each satellite in the satellite network can independently isolate the first satellite with the fault, resources of the ground control center are saved, and the ground control center does not need to actively inject isolation instructions to each satellite in the satellite network.
In some embodiments, in step S140, after the step of recording the state of the first satellite as the failure state by each satellite in the satellite network, the method further includes: each satellite in the satellite network does not generate data destined for the first satellite.
Illustratively, referring to fig. 2, when a first satellite having an availability status of 242 is present in the network node availability table 200 of each satellite in the satellite network itself, each satellite in the satellite network does not generate data for the first satellite having a destination node of 242 unavailable status. By the aid of the disposal means, each satellite in the satellite network can independently isolate the first satellite with the fault, resources of the ground control center are saved, and the ground control center does not need to actively inject isolation instructions to each satellite in the satellite network.
In some embodiments, the step S140, after the step of recording, by each satellite in the satellite network, that the state of the first satellite is the failure state, further includes: each satellite in the satellite network does not forward data through the first satellite.
Illustratively, referring to fig. 2, when a first satellite having an availability status of unavailable 242 is present in each satellite's own network node availability table 200 in the satellite network, each satellite in the satellite network does not select the first satellite having an unavailable 242 status when selecting a forwarding data path. By the aid of the disposal means, each satellite in the satellite network can independently isolate the first satellite with the fault, resources of the ground control center are saved, and the ground control center does not need to actively inject isolation instructions to each satellite in the satellite network.
In some embodiments, the step S140, after the step of recording, by each satellite in the satellite network, that the state of the first satellite is the failure state, further includes: each satellite in the satellite network discards data destined for the first satellite.
Illustratively, referring to FIG. 2, when a first satellite whose availability state is unavailable 242 is present in each satellite's own network node availability table 200 in the satellite network, each satellite in the satellite network automatically discards data upon receiving data for the first satellite whose purpose is the unavailable 242 state. By the aid of the disposal means, each satellite in the satellite network can independently isolate the first satellite with the fault, resources of the ground control center are saved, and the ground control center does not need to actively inject isolation instructions to each satellite in the satellite network.
Fig. 3 is an exemplary flowchart of a method for detecting a satellite network node failure according to an embodiment of the present application. Note that M in fig. 3 indicates the number of all satellites in the satellite network, satellite a corresponds to a first satellite of the present application, and satellites B to N correspond to a plurality of second satellites of the present application.
Exemplarily, the work flows of the detection method of the satellite network node failure and the handling method for various node failures of the present application are described in detail with reference to fig. 2 and fig. 3:
referring to fig. 2 and 3, step S310 is an initial stage of the operation of the satellite network. In this stage, after the ground control center performs link establishment planning on the entire satellite network according to the routine long pipe flow, the ground control center distributes the network node availability table 200 and the link establishment schedule of the satellite to all satellites in the satellite network. The satellite A establishes inter-satellite links with the satellite B to the satellite N respectively in different time slices according to a time division polling mode. Exemplarily, in step S311, the satellite a establishes an inter-satellite link with the satellite B; in step S312, a link between the satellite a and the satellite is established; in step S313, the satellite a establishes an inter-satellite link with the satellite N.
In step S320, the satellite performs inter-satellite link establishment failure monitoring. In step S320, when the satellite a fails, the link establishment between the satellite B and the satellite N and the satellite a is abnormal, and if the satellite does not continue to establish a link with the satellite a within a certain time, the satellite a is recorded as a "possible failure" state by the satellite. Exemplarily, in step S321, when the satellite B is unsuccessful in continuously establishing a link with the satellite a within a certain time, it indicates that an abnormality occurs in the link establishment, and the satellite B records the satellite a as a "possible failure" state; in step S322, when the satellite is not successful in building a link with the satellite a continuously within a certain time, it indicates that an abnormality occurs in building a link, and the satellite records the satellite a as a "possible failure" state; in step S323, when the satellite N is not successful in establishing a link with the satellite a continuously for a certain time, it indicates that an abnormality occurs in establishing the link, and the satellite N records the satellite a as a "possible failure" state.
In step S330, the satellite performs a fault warning flood broadcast. Through the foregoing step S320, after the satellites B to N mark the satellite a as the "possible failure" state, the satellites B to N respectively initiate the flood broadcast of the whole satellite network with the "possible failure" state, that is, the abnormal information. Illustratively, in step S331, satellite B flood broadcasts the "possible failure" status of satellite a to satellites a to M; in step S332, the satellite broadcasts the "possible failure" status of the satellite a to the satellites M in a flooding manner; in step S333, satellite N flood broadcasts the "possible failure" status of satellite a to satellites M.
In step S340, the satellite makes a voting decision. In order to avoid misjudgment, after the satellite receives the fault early warning flood broadcast, the satellite records the number of the satellite which receives the broadcast information, the satellite at least establishes an inter-satellite link with N different satellites in a link establishment period, and when the satellite receives the fault early warning flood broadcast information of more than m satellites to the satellite A, the satellite A is marked to be in a fault state. Illustratively, in step S341, when satellite B receives a "satellite a failure" message broadcast by more than m nodes, satellite B marks satellite a as a "failure" state; in step S342, when the satellite receives the "satellite a failure" message broadcast by more than m nodes, the satellite marks the satellite a in a "failure" state; in step S343, when the satellite M receives the "satellite a failure" message broadcast by more than M nodes, the satellite M marks the satellite a as the "failure" state.
In step S350, the satellite performs node failure handling. When the satellite A is marked to be in a 'failure' state, the satellite automatically updates the satellite availability 240 state of the satellite A in the network node availability table 200 of the satellite to be unavailable 242, and the satellite handles the satellite A in the 'unavailable' state. Exemplarily, the method for disposing the satellite a by the satellite B351 includes: in step S352, satellite B351 does not establish an inter-satellite link with satellite a; in step S353, the satellite B351 does not generate data destined for the satellite a; in step S354, satellite B351 does not forward the data through satellite a; in step S355, satellite B351 discards the data destined for satellite a. Preferably, step S352, step S353, step S354 and step S355 included in the above processing method are all used, and in actual cases, the step S352, step S353, step S354 and step S355 may be used alternatively or in combination, and the present application is not limited thereto. The handling method of the satellite a by the satellite 356 and the satellite M357 is the same as the satellite B351, and is not described herein again.
The method and the system monitor the condition of the built-up chain satellite through each satellite in the satellite network based on the time division system, autonomously initiate flood broadcast early warning of the satellite with the possible fault, judge whether the satellite is in the fault or not by adopting a voting mode based on broadcast information through all satellite nodes in the satellite network, and automatically isolate the fault satellite. The satellite network fault node automatic detection and treatment are realized, the satellite node can automatically shield a fault data transmission path to isolate a fault satellite after a certain node in the satellite network has a fault without depending on the processing of a ground control center, and the intelligent operation level of the satellite network is improved.
The application also includes a system for detecting a failure of a satellite network node, comprising a memory and a processor. Wherein the memory is to store instructions executable by the processor; the processor is configured to execute the instructions to implement the method for detecting a satellite network node failure described above.
Fig. 4 is a system block diagram of a system for detecting a satellite network node failure according to an embodiment of the present application. Referring to fig. 4, the satellite network node failure detection system 400 may include an internal communication bus 401, a processor 402, a Read Only Memory (ROM)403, a Random Access Memory (RAM)404, and a communication port 405. When implemented on a personal computer, the satellite network node failure detection system 400 may also include a hard disk 406. The internal communication bus 401 may enable data communication among the components of the satellite network node failure detection system 400. The processor 402 may make the determination and issue the prompt. In some embodiments, processor 402 may be comprised of one or more processors. The communication port 405 may enable the satellite network node failure detection system 400 to communicate data externally. In some embodiments, the satellite network node failure detection system 400 may send and receive information and data from the network through the communication port 405. The satellite network node failure detection system 400 may also include various forms of program storage units and data storage units, such as a hard disk 406, Read Only Memory (ROM)403 and Random Access Memory (RAM)404, capable of storing various data files for computer processing and/or communication use, as well as possibly program instructions for execution by the processor 402. The processor executes these instructions to implement the main parts of the method. The results processed by the processor are communicated to the user device through the communication port and displayed on the user interface.
The method for detecting a satellite network node fault may be implemented as a computer program, stored in the hard disk 406, and loaded into the processor 402 to be executed, so as to implement the method for detecting a satellite network node fault according to the present application.
The present application also includes a computer readable medium having stored thereon a computer program code which, when executed by a processor, implements the method of detection of a satellite network node failure as described above.
The method for detecting a satellite network node failure, when implemented as a computer program, may also be stored as an article of manufacture in a computer-readable storage medium. For example, computer-readable storage media can include but are not limited to magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips), optical disks (e.g., Compact Disk (CD), Digital Versatile Disk (DVD)), smart cards, and flash memory devices (e.g., electrically Erasable Programmable Read Only Memory (EPROM), card, stick, key drive). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media (and/or storage media) capable of storing, containing, and/or carrying code and/or instructions and/or data.
It should be understood that the above-described embodiments are illustrative only. The embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the processor may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, and/or other electronic units designed to perform the functions described herein, or a combination thereof.
Aspects of the present application may be embodied entirely in hardware, entirely in software (including firmware, resident software, micro-code, etc.) or in a combination of hardware and software. The above hardware or software may be referred to as "data block," module, "" engine, "" unit, "" component, "or" system. The processor may be one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), digital signal processing devices (DAPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, or a combination thereof. Furthermore, aspects of the present application may be represented as a computer product, including computer readable program code, embodied in one or more computer readable media. For example, computer-readable media may include, but are not limited to, magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips … …), optical disks (e.g., Compact Disk (CD), Digital Versatile Disk (DVD) … …), smart cards, and flash memory devices (e.g., card, stick, key drive … …).
The computer-readable medium may comprise a propagated data signal with the computer program code embodied therein, for example, on a baseband or as part of a carrier wave. The propagated signal may take any of a variety of forms, including electromagnetic, optical, and the like, or any suitable combination. The computer readable medium can be any computer readable medium that can communicate, propagate, or transport the program for use by or in connection with an instruction execution system, apparatus, or device. Program code on a computer readable medium may be propagated over any suitable medium, including radio, electrical cable, fiber optic cable, radio frequency signals, or the like, or any combination of the preceding.
Having thus described the basic concept, it should be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.
Also, this application uses specific language to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, certain features, structures, or characteristics may be combined as suitable in one or more embodiments of the application.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited. Further, although the terms used in the present application are selected from publicly known and used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Further, it is required that the present application is understood not only by the actual terms used but also by the meaning of each term lying within.
Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.
Claims (14)
1. A method for detecting a node failure in a satellite network, the satellite network including a first satellite and a plurality of second satellites, the method comprising:
each second satellite establishes an inter-satellite link with the first satellite;
each second satellite monitors the establishment process of the inter-satellite link, and when the establishment process of the inter-satellite link is abnormal, the second satellite records the state of the first satellite as a possible fault state;
the second satellite initiating a broadcast to all satellites in the satellite network, the broadcast information including the possible failure state of the first satellite; and
and each satellite in the satellite network records the number of the received possible fault states, and when the number reaches a preset threshold value, each satellite in the satellite network records the state of the first satellite as a fault state.
2. The method for detecting a satellite network node failure of claim 1, wherein the step of the second satellite initiating a broadcast to all satellites in the satellite network comprises: the broadcast mode includes to the flood broadcast of satellite network, the broadcast information of flood broadcast includes survival hop count control word, survival hop count control word is once only through satellite forwarding automatic subtract one, works as survival hop count control word is zero, broadcast information disappears automatically.
3. The method for detecting a satellite network node failure according to claim 1, wherein the step of establishing an inter-satellite link between each of the second satellites and the first satellite comprises: and the first satellite establishes the inter-satellite link with each second satellite respectively according to a time division polling mode.
4. The method of claim 1, wherein each satellite in the satellite network comprises a link establishment schedule, the link establishment schedule comprising an inter-satellite link schedule for each satellite establishing a pairing with a different satellite, the step of each second satellite establishing an inter-satellite link with the first satellite comprising: and each second satellite establishes the inter-satellite link with the first satellite according to the link establishment schedule.
5. The method according to claim 1, wherein each satellite in the satellite network includes a network node availability table, the network node availability table includes an availability status of each satellite in the satellite network, the availability status includes available or unavailable, each second satellite determines whether to establish the inter-satellite link with the first satellite according to the network node availability table, and the second satellite establishes the inter-satellite link with the first satellite when the availability status of the first satellite in the network node availability table of the second satellite itself is available.
6. The method according to claim 5, wherein each satellite in the satellite network updates the availability status of the first satellite in its own network node availability table to unavailable when each satellite in the satellite network records the status of the first satellite as a failure status.
7. The method for detecting a satellite network node failure according to claim 1, wherein the step of establishing an inter-satellite link between each of the second satellites and the first satellite comprises: and the second satellite establishes the inter-satellite link with the first satellite continuously according to preset times in a first period.
8. The method according to claim 7, wherein the step of determining that the inter-satellite link establishment process is abnormal comprises: and the second satellite establishes the inter-satellite link with the first satellite continuously according to the preset times in the first period, wherein the inter-satellite link is not successful.
9. The method for detecting a failure in a node of a satellite network according to claim 1, wherein after the step of recording the state of the first satellite as a failure state by each satellite in the satellite network, further comprising: each satellite in the satellite network does not establish the inter-satellite link with the first satellite.
10. The method for detecting a failure of a satellite network node as claimed in claim 1, further comprising, after the step of each satellite in the satellite network recording the state of the first satellite as a failure state: each satellite in the satellite network does not generate data destined for the first satellite.
11. The method for detecting a failure in a node of a satellite network according to claim 1, wherein after the step of recording the state of the first satellite as a failure state by each satellite in the satellite network, further comprising: each satellite in the satellite network does not forward data through the first satellite.
12. The method for detecting a failure of a satellite network node as claimed in claim 1, further comprising, after the step of each satellite in the satellite network recording the state of the first satellite as a failure state: each satellite in the satellite network discards data destined for the first satellite.
13. A system for detecting a failure of a satellite network node, comprising:
a memory for storing instructions executable by the processor;
a processor for executing the instructions to implement the method of detecting a satellite network node failure as claimed in any one of claims 1 to 12.
14. A computer-readable medium having stored thereon computer program code, wherein the computer program code realizes the method for detecting a failure of a satellite network node according to any one of claims 1-12 when executed by a processor.
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