CN106533541A - Method and device for information sharing in spatial information network - Google Patents

Method and device for information sharing in spatial information network Download PDF

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Publication number
CN106533541A
CN106533541A CN201710008750.7A CN201710008750A CN106533541A CN 106533541 A CN106533541 A CN 106533541A CN 201710008750 A CN201710008750 A CN 201710008750A CN 106533541 A CN106533541 A CN 106533541A
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satellite
current
time slot
information
current satellite
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CN106533541B (en
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任勇
王景璟
姜春晓
张鑫
郭强
王新
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Tsinghua University
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Tsinghua University
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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
    • 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
    • H04B7/18523—Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service
    • 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
    • H04B7/18523—Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service
    • H04B7/18526—Arrangements for data linking, networking or transporting, or for controlling an end to end session
    • 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
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18569—Arrangements for system physical machines management, i.e. for construction operations control, administration, maintenance
    • H04B7/18573—Arrangements for system physical machines management, i.e. for construction operations control, administration, maintenance for operations control, administration or maintenance

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  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computing Systems (AREA)
  • Radio Relay Systems (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

The invention provides a method and a device for information sharing in a spatial information network. The method comprises the following steps that a current satellite obtains a current credit value of a target satellite; the current satellite judges whether the target satellite is reliable based on the credit value of the current satellite and the current credit value of the target satellite; if the target satellite is judged to be reliable, the current satellite carries out sharing negotiation with the target satellite; when a received sharing negotiation result which is fed back by the target satellite is to carry out sharing, the current satellite carries out physical layer information sharing with the target satellite; and after the current satellite carries out information sharing with the target satellite, the credit value of the current satellite is updated. According to the method, the propagation of the false physical layer information in a spatial network can be effectively prevented, the influence of the false physical layer information on the network is reduced, and a technical problem of larger probability of the false information which is provided when the information between the satellites is shared in the existing spatial network is alleviated.

Description

Information sharing method and device in spatial information network
Technical Field
The present invention relates to the technical field of satellite communications, and in particular, to a method and an apparatus for sharing information in a spatial information network.
Background
With the increase of satellite services, the traditional single-satellite transmission mode cannot meet the requirements. In order to improve the transmission efficiency of the satellite, communication between the satellite and the ground station is required, and the satellite and the ground station are not applicable to the traditional ground networking of the satellite moving at high speed. With the development of satellite technology and the increase of the number of satellites, new requirements are also put on satellite networking technology, and information sharing in a satellite space network is part of the satellite networking technology. In a space network, link information and channel conditions between a satellite and a satellite (such as a relay satellite) and between the satellite and a ground station have important significance for satellite networking transmission.
Unlike a ground network, a satellite in a space network moves at a high speed, and the connection relationship between any two points in the network is dynamically time-varying. Meanwhile, factors influencing the inter-satellite and inter-satellite channel conditions are very complex (such as weather conditions), so that information sharing in a space network depends on cooperative transmission among satellites. The satellite can acquire some physical characteristics of a transmission channel in the information sharing process, and physical layer information (mainly comprising a topological structure, link information and a channel between the satellites) of a space network is fully utilized, so that the error rate of information transmission is lowest, the path delay of transmission is possibly minimum, and the transmission efficiency can be improved. Therefore, real physical layer information is very important for efficient transmission. In order to improve transmission efficiency, the satellite usually reports its own link condition and channel condition to the control nodes in the space network, but there may be some nodes that provide false physical layer information in order to extend its benefits (e.g., higher bandwidth, less delay).
Many information sharing mechanisms have been proposed, such as: the broadcast mechanism is stored. But the scenarios for these mechanisms are limited to terrestrial networks. In the existing mechanism, it is assumed that the overall benefit between the satellites is maximized (such as minimum transmission delay, maximum throughput, etc.), and a cooperative manner is adopted, so as to achieve a win-win situation. However, in the existing spatial network, the probability of false information provided by the satellite is high, and false channel or link information is generated once a malicious node (i.e. the satellite) is present in order to acquire extra bandwidth or reduce time delay.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an information sharing method and apparatus in a spatial information network, so as to alleviate the technical problem of the existing spatial network that the probability of providing false information by a satellite is relatively high.
In a first aspect, an embodiment of the present invention provides an information sharing method in a spatial information network, including:
the method comprises the steps that a current satellite obtains a current credit value of a target satellite, wherein the credit value is obtained by updating a control center of a space network according to data transmitted by each satellite in history, and the target satellite is selected by the current satellite according to a topological relation of the space network;
judging whether the target satellite is reliable or not based on the credit value of the current satellite and the current credit value of the target satellite;
if the target satellite is judged to be reliable, sharing negotiation is carried out with the target satellite;
when the sharing negotiation result fed back by the target satellite is received to be shared, the current satellite and the target satellite share physical layer information;
and after the current satellite shares information with the target satellite, updating the credit value of the current satellite, so that the current satellite performs sharing operation in the next time slot of the current time slot through the updated credit value of the current satellite.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where updating the credit value of the current satellite includes:
updating the number of satellites in the space network which share information with the current satellite to obtain the updated number of satellites;
judging whether the number of the updated satellites meets an updating condition or not, wherein the updating condition is used for updating the credit value of the current satellite;
and if the updating condition is judged to be met, updating the credit value of the current satellite.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where after determining that the target satellite is reliable, the method further includes:
the current satellite acquires a shared information probability distribution vector, wherein the shared information probability distribution vector comprises the probability of information sharing between the current satellite and each satellite in the space network;
and the current satellite judges whether to share information with the target satellite according to the probability distribution vector of the shared information, and if so, the current satellite performs sharing negotiation with the target satellite.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where after the current satellite and the target satellite perform physical layer information sharing, the method further includes:
and updating the shared information probability distribution vector so that the current satellite determines whether the current satellite shares information with the target satellite through the updated shared information probability distribution vector in the time slot next to the current time slot.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where updating the shared information probability distribution vector includes:
determining a state parameter of the current satellite at the current time slot based on the credit value of the current satellite at the current time slot, wherein the state parameter is used for indicating whether the current satellite can provide real physical layer information or not;
determining a utility function of the current satellite at the current time slot based on the state parameter of the current satellite at the current time slot;
updating the observation state of the current satellite in the current time slot based on the utility function of the current satellite to obtain the observation state of the current satellite in the next time slot;
judging whether the observation state of the next time slot and the observation state of the current time slot meet preset conditions or not, wherein the preset conditions areη indicate the tolerance of the current satellite,represents an observation state of the current satellite at the current time slot,representing an observation state of the current satellite at the next time slot;
and if the preset condition is met, determining the shared information probability of the current satellite in the next time slot, and determining the shared information probability of the next time slot as the updated shared information probability.
With reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where determining, based on the state parameter of the current satellite at the current time slot, a utility function of the current satellite at the current time slot includes:
according to the formulaConstructing a utility function of the current satellite in the current time slot, wherein when the state parameter isWhen the state parameter is equal to the current time slot, the current satellite provides real physical layer information at the time slot which is the last time slot of the current time slotWhen the state parameter is equal toWhen the state parameter is the last time slot, the current satellite provides false physical layer informationIndicates that the current satellite provides spurious physics at the current time slotLayer information, c represents energy consumption when the current satellite shares physical layer information, G represents a preset reward of the current satellite, and pijRepresenting a probability that the current satellite is connected to the target satellite.
With reference to the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where updating the observation state of the current satellite in the current time slot based on the utility function of the current satellite, and obtaining the observation state of the current satellite in the next time slot includes:
based on utility function of the current satellite at the current time slot, according to formulaUpdating the observation state of the current satellite in the current time slot to obtain the observation state of the current satellite in the next time slot, wherein,represents an observation state of the current satellite at the current time slot,a utility function representing the current satellite at the current time slot,represents a learning rate of the current satellite at the current time slot,indicating that the current satellite shares information with the target satellite at the current time slot,indicating that the current satellite does not share information with the target satellite at the current time slot.
With reference to the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where determining a probability of information sharing of the current satellite in the next time slot includes:
according to the formulaDetermining the probability of sharing information for the current satellite at the next time slot, wherein,and representing the exploration capability of the current satellite in the current time slot, wherein the exploration capability is the capability of the current satellite to explore an exploration target.
In a second aspect, an embodiment of the present invention further provides an information sharing apparatus in a spatial information network, including:
the system comprises an acquisition module, a data acquisition module and a data transmission module, wherein the current satellite acquires a current credit value of a target satellite, the credit value is obtained by updating a control center of a space network according to data transmitted by each satellite in history, and the target satellite is selected by the current satellite according to a topological relation of the space network;
the judging module is used for judging whether the target satellite is reliable or not based on the credit value of the current satellite and the current credit value of the target satellite;
the sharing negotiation module carries out sharing negotiation with the target satellite if the target satellite is judged to be reliable;
the information sharing module is used for sharing the physical layer information between the current satellite and the target satellite when the sharing negotiation result fed back by the target satellite is received;
and the credit value updating module is used for updating the credit value of the current satellite after the current satellite shares information with the target satellite so that the current satellite performs sharing operation through the updated credit value of the current satellite in a time slot next to the current time slot.
With reference to the second aspect, an embodiment of the present invention provides a first possible implementation manner of the second aspect, where the credit value updating module includes:
the updating submodule updates the number of satellites in the space network, which share information with the current satellite, so as to obtain the updated number of satellites;
the first judgment submodule is used for judging whether the number of the updated satellites meets an updating condition or not, wherein the updating condition is used for updating the credit value of the current satellite;
and the credit value updating submodule updates the credit value of the current satellite if the updating condition is judged to be met.
The embodiment of the invention has the following beneficial effects: the embodiment of the invention provides an information sharing method and device in a spatial information network, wherein the information sharing method in the spatial information network comprises the following steps: the current satellite acquires a current credit value of a target satellite, wherein the credit value is obtained by updating a control center of a space network according to data transmitted by each satellite in history, and the target satellite is selected by the current satellite according to a topological relation of the space network; judging whether the target satellite is reliable or not based on the credit value of the current satellite and the current credit value of the target satellite; if the target satellite is judged to be reliable, sharing negotiation is carried out with the target satellite; when the sharing negotiation result fed back by the target satellite is received as sharing, the current satellite and the target satellite share physical layer information; after the current satellite shares information with the target satellite, updating the credit value of the current satellite so that the current satellite determines to execute sharing operation in the next time slot of the current time slot through the updated credit value of the current satellite;
compared with the prior space network which has higher probability of providing false information when information is shared among satellites, the method comprises the steps that the current satellite firstly obtains the current credit value of the target satellite, then whether the target satellite is reliable is judged based on the current credit value of the target satellite, if the target satellite is reliable, the current satellite and the target satellite carry out sharing negotiation, then when the sharing negotiation result fed back by the target satellite is sharing, the current satellite and the target satellite carry out physical layer information sharing, and finally, after the information is shared, the credit value of the current satellite is updated according to the sharing result. The method can ensure that the information sharing among the satellite groups in the space network is more reliable, effectively prevents the propagation of the false physical layer information in the space network, reduces the influence of the false physical layer information on the network, and relieves the technical problem of higher probability of providing the false information by the satellite in the existing space network.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of an information sharing method in a spatial information network according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating updating a credit value of a current satellite according to an embodiment of the present invention;
fig. 3 is a flowchart of another method for sharing information in a spatial network after determining that a target satellite is reliable according to an embodiment of the present invention;
fig. 4 is a flowchart of updating a probability distribution vector of shared information according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an information sharing apparatus in a spatial information network according to an embodiment of the present invention.
Icon:
11-a first acquisition module; 12-a first judgment module; 13-a shared negotiation module; 14-an information sharing module; 15-credit update module.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, in the prior art, the credibility of information is generally not considered in the sharing of information in a spatial network, so that the propagation probability of false information is high. Based on this, the method for sharing information in the spatial information network provided by the embodiment of the invention can enable the information sharing between two satellites in the spatial network to be more reliable, effectively prevent the propagation of false physical layer information in the spatial network, and reduce the influence of the false physical layer information on the network.
To facilitate understanding of the embodiment, first, a detailed description is given to an information sharing method in a spatial information network disclosed in the embodiment of the present invention.
An information sharing method in a spatial information network, referring to fig. 1, the method comprising:
s101, the current satellite acquires the current credit value of a target satellite, wherein the credit value is obtained by updating the control center of the space network according to data transmitted by each satellite in history, and the target satellite is selected by the current satellite according to the topological relation of the space network;
in an embodiment of the invention, the spatial network is formed by a plurality of satellite networks. The information shared by the information sharing is mainly physical layer information of a space network, and the physical layer information mainly comprises a topological structure between satellites, link information and channel information. Real physical layer information is very important for efficient networking transmission, and false physical layer information affects access selection of other satellites, channel allocation of relay satellites, routing selection in a space network and the like, so that the time delay of the whole space network is increased and even broken down.
In the embodiment of the invention, the concept of satellite credit value is introduced, the probability of sharing real physical layer information among satellites can be increased through the analysis of the credit value, and the propagation of false physical layer information in a space network is effectively prevented. Specifically, the credit value of each satellite may be stored by a control center, and each satellite may obtain the credit values of other satellites from the control center, where the control center may be a relay satellite or other satellites, which is not particularly limited by the embodiment of the present invention.
In addition, it should be noted that the credit value of the satellite is not constant, and the credit value of the satellite changes with time, that is, if the credit values of the current satellite and the target satellite are large enough in the current time slot, the two satellites can share information. However, it should be noted that this does not mean that the credit values of the current satellite and the target satellite in the next time slot still satisfy the condition of information sharing, that is, if the current satellite and the target satellite in the current time slot share information and do not represent the next time slot, information sharing between the two satellites can still be performed, so the information sharing between the satellites in the present invention is an iterative algorithm that changes with the time slot.
S102, judging whether the target satellite is reliable or not based on the credit value of the current satellite and the current credit value of the target satellite; if it is determined that the target satellite is unreliable, step S1031 is performed, and if it is determined that the target satellite is reliable, step S1032 is performed.
After the current satellite acquires the credit value of the target satellite, whether the target satellite is reliable or not is judged, namely whether the credit value of the target satellite meets a preset threshold value for information sharing between the current satellite and other satellites or not is judged.
S1031, the current satellite and the target satellite do not share information;
s1032, sharing negotiation is carried out between the current satellite and the target satellite;
and if the credit value of the target satellite meets a preset threshold value for information sharing between the current satellite and other satellites, obtaining that the target satellite is reliable, and performing sharing negotiation with the target satellite. That is, after the current satellite determines that the target satellite is reliable, the current satellite has an intention to share information with the target satellite, and at the same time, also determines whether the target satellite has an intention to share information with the target satellite. The preset threshold for information sharing between the current satellite and the target satellite and between other satellites is not particularly limited.
S104, when the sharing negotiation result fed back by the target satellite is received and sharing is carried out, the current satellite and the target satellite carry out physical layer information sharing;
when the sharing negotiation result fed back by the target satellite is received as sharing, the target satellite also has the intention of information sharing with the current satellite, and then the current satellite and the target satellite share information.
And S105, updating the credit value of the current satellite so that the current satellite performs sharing operation through the updated credit value of the current satellite in the time slot next to the current time slot.
After information sharing is carried out, the current satellite updates the credit value of the current satellite, whether the current satellite is reliable in the next time slot or not can be further determined through the credit value of the current satellite after updating, and then sharing operation of the next time slot is completed. Similarly, the target satellite updates its credit value.
The embodiment of the invention provides an information sharing method in a spatial information network, which comprises the following steps: the current satellite acquires a current credit value of a target satellite, wherein the credit value is obtained by updating a control center of a space network according to data transmitted by each satellite in history, and the target satellite is selected by the current satellite according to a topological relation of the space network; judging whether the target satellite is reliable or not based on the credit value of the current satellite and the current credit value of the target satellite; if the target satellite is judged to be reliable, sharing negotiation is carried out with the target satellite; when the sharing negotiation result fed back by the target satellite is received as sharing, the current satellite and the target satellite share physical layer information; after the current satellite shares information with the target satellite, updating the credit value of the current satellite so that the current satellite determines to execute sharing operation in the next time slot of the current time slot through the updated credit value of the current satellite;
compared with the prior space network that the probability of providing false information is higher when information is shared among satellites, in the embodiment of the invention, the current satellite firstly acquires the current credit value of the target satellite, and then judges whether the target satellite is reliable or not based on the current credit value of the target satellite, wherein if the current satellite is reliable, the current satellite and the target satellite perform sharing negotiation, further when the sharing negotiation result fed back by the target satellite is sharing, the current satellite and the target satellite perform physical layer information sharing, and finally, the credit value of the current satellite is updated after the information sharing.
The information sharing method in the spatial information network provided by the embodiment of the invention can ensure that the information sharing among the satellite groups in the spatial network is more reliable, effectively prevents the propagation of false physical layer information in the spatial network, reduces the influence of the false physical layer information on the network, and relieves the technical problem of higher probability of providing the false information by the satellite in the existing spatial network.
The above-mentioned content makes a brief description of the information sharing method in the spatial information network as a whole, and the following describes the steps involved in the method in detail. Referring to fig. 2, updating the credit value of the current satellite includes:
s201, updating the number of satellites in the space network for information sharing with the current satellite to obtain the updated number of satellites;
and after the current satellite shares information with the target satellite, updating the number of satellites sharing information with the current satellite. Wherein, the number of the satellites sharing the information with the current satellite is updated to obtain
S202, judging whether the number of the updated satellites meets an updating condition or not, wherein the updating condition is used for updating the credit value of the current satellite; if the update condition is judged to be satisfied, executing step S2031, and if the update condition is judged not to be satisfied, executing step S2032;
the above-mentioned update condition isWherein,indicating the number of satellites that share information with the current satellite after updating, nthA threshold value representing the number of satellites sharing information with the current satellite.
And S2031, updating the credit value of the current satellite.
After judging that the number of the updated satellites meets the updating condition, the credit value of the current satellite is calculated according to a formulaThe update is performed, wherein,the credit value for the current satellite for the current time slot,for the credit, Δ r, of the current satellite in the next time slotiThe step of the credit value of the current satellite is preset, and the value of the step is larger than 0, so that the credit value of the current satellite is increased, and the current satellite is encouraged to share information with other satellites. The credit value is used to determine whether the current satellite is reliable for the next time slot.
And S2032, not updating the credit value of the current satellite.
Further, referring to fig. 3, after determining that the target satellite is reliable, the method further includes:
s301, the current satellite acquires a shared information probability distribution vector, wherein the shared information probability distribution vector comprises the probability of information sharing between the current satellite and each satellite in a space network;
after the target satellite is judged to be reliable based on the credit value of the target satellite, the invention also adds an information sharing condition, namely a shared information probability distribution vector.
For the space network, the probability distribution vector of the shared information of the current satellite is qi＝[qi1,qi2......qiN]，qijDenotes qiI denotes the current satellite, j denotes the target satellite, q, in the present embodimentijMay represent the probability that the current satellite and the target satellite share information. After each information sharing, q is updatediThe value of (c).
S302, judging whether the current satellite shares information with the target satellite according to the probability distribution vector of the shared information; if yes, executing step S303, and if no, executing step S304;
s303, sharing negotiation is carried out between the current satellite and the target satellite;
and S304, the current satellite does not share and negotiate with the target satellite.
After obtaining the probability distribution vector of the shared information, the probability distribution vector is calculated by qijAnd determining whether to share information with the target satellite, and if so, performing sharing negotiation with the target satellite.
In addition, the sharing negotiation includes that the target satellite can also obtain its own shared information probability distribution vector qjAccording to the ith component q in the probability distribution vector of the shared informationjiAnd judging whether to share information with the current satellite, if so, sharing the information between the current satellite and the target satellite.
At this time, for a in the current satellitei＝[ai1,ai2......aiN]The jth component is 1, i.e., aijI.e. the current satellite shares information with the target satellite 1.
Further, after the current satellite and the target satellite share the physical layer information, the method further includes:
and updating the shared information probability distribution vector so that the current satellite determines whether the current satellite shares information with the target satellite through the updated shared information probability distribution vector in the time slot next to the current time slot.
Specifically, after the current satellite and the target satellite share the physical layer information, the updated shared information probability distribution vector is substantially the jth component in the updated vector.
Further, referring to fig. 4, updating the shared information probability distribution vector includes:
s401, determining a state parameter of a current satellite in a current time slot based on a credit value of the current satellite in the current time slot, wherein the state parameter is used for indicating whether the current satellite can provide real physical layer information;
each satellite has two states, where s0Indicating that the satellite provides true physical layer information, s1Indicating that the satellite provides false physical layer information. Each satellite has an initial state parameter (or the last time slot of the current time slot), the credit value is a value between 0 and 1, and the state parameter of the current satellite in the current time slot is determined by the acquired current credit value according to a random algorithm.
S402, determining a utility function of the current satellite in the current time slot based on the state parameter of the current satellite in the current time slot;
according to the formulaConstructing a utility function of the current satellite in the current time slot, wherein the state parameter isWhen the current satellite provides real physical layer information in the time slot which is the last time slot of the current time slot, and the state parameter isWhen the state parameter isTime, indicates the last timeThe current satellite provides false physical layer information when the state parameter isWhen the current satellite provides false physical layer information at the current time slot, c represents the energy consumption when the current satellite shares the physical layer information, G represents the preset reward of the current satellite, and pijRepresenting the probability that the current satellite is connected to the target satellite.
After the state parameter of the current satellite in the current time slot is determined, the state parameter of the current satellite in the last time slot of the current time slot is known, so that the utility function of the current satellite in the current time slot can be determined according to the two state parameters, and specifically, the two state parameters are substituted into the formula of the utility function.
Wherein, in order to stimulate each satellite to provide real physical layer information, the preset reward of the current satellite is set as G, and if the current satellite provides false physical layer information, the reward is 0.
Specifically, the probability of the communication between the current satellite and the target satellite can be calculated by a satellite link model:
g ═ V, E, P, where G denotes the topology of the distributed constellation and V denotes the nodes in the spatial network, i.e. the satellites, as a set of points; e represents a communication link between the satellites, determines whether the link exists according to whether the distance is smaller than the communication distance, and represents an edge set; p denotes the probability of two satellite connections, element P of PijRepresenting the probability that the current satellite is connected to the target satellite.
There are two cases of link outage:
(1) when the current satellite is not visible to other satellites in the spatial network;
(2) when the channel signal-to-noise ratio is less than a certain threshold value gamma.
Consider the connection between the current satellite and the target satellite:
the channel model between satellites is a rayleigh model, and the signal-to-noise ratio is expressed as:
wherein,
the probability of a connection interruption is:
where Δ represents the sum of interference and noise interference of other satellites, and the channel between satellites follows the Rayleigh channel model, so hijSubject to an exponential distribution, aijIs a channel loss parameter.
S403, updating the observation state of the current satellite in the current time slot based on the utility function of the current satellite to obtain the observation state of the current satellite in the next time slot;
in the embodiment of the invention, based on the utility function of the current satellite in the current time slot, the utility function is calculated according to the formulaUpdating the observation state of the current satellite in the current time slot to obtain the observation state of the current satellite in the next time slot, wherein,indicating the current satellite's observation state at the current time slot,represents the utility function of the current satellite at the current time slot,indicating the learning rate of the current satellite at the current time slot,indicating that the current satellite shares information with the target satellite at the current time slot,indicating that the current satellite does not share information with the target satellite at the current time slot.
Specifically, after the utility function of the current satellite in the current time slot is obtained, the observation state of the current satellite in the current time slot is updated according to the condition that whether the current satellite shares information with the target satellite in the current time slot, and the observation state of the current satellite in the next time slot is obtained through updating. Specifically, the utility function of the current satellite in the current time slot is obtained and is substituted into a corresponding formula. Wherein,the learning rate of the current satellite in the current time slot is represented, which is a quantity characterizing the performance parameter of the current satellite and can be preset.
S404, judging whether the observation state of the next time slot and the observation state of the current time slot meet a preset condition, wherein the preset condition isη indicate the tolerance of the current satellite,indicating the current satellite's observation state at the current time slot,representing the observation state of the current satellite in the next time slot;
after the observation state of the current satellite in the next time slot is obtained, the observation state of the current satellite in the current time slot is also known, and whether the observation state of the current satellite in the next time slot and the observation state of the current time slot meet the preset condition or not is judged according to the observation state of the next time slot and the observation state of the current time slotη indicate the tolerance of the current satellite, the size of the value is also preset.
S405, if the preset condition is judged to be met, determining the shared information probability of the current satellite in the next time slot, and determining the shared information probability of the next time slot as the updated shared information probability.
In particular, according to the formulaDetermining the probability of sharing information of the current satellite in the next time slot, wherein,the exploration capability of the current satellite in the current time slot is shown, and the exploration capability is the capability of the current satellite in exploring an exploration target.
If the observation state of the next time slot and the observation state of the current time slot meet the preset condition:according to the formulaDetermining the probability of sharing information of the current satellite in the next time slotWherein,the observed state of the current time slot, which has been previously found,the method includes the steps that the exploration capacity of the current satellite in the current time slot is shown, wherein the exploration capacity is the capacity of the current satellite for exploring an exploration target and is also a preset value.
The embodiment of the invention provides an information sharing method in a spatial information network, which has the key points that the credibility of satellite sharing information is fully considered, each satellite selects credible satellites as much as possible to share the information through a credit value, and the propagation of false physical layer information in the spatial network is effectively avoided. The scheme effectively reduces the harm of malicious nodes to the space network, and meanwhile, the credibility of information sharing in the space network is ensured by the cooperation selection method based on the credit value, and the high efficiency of networking transmission is ensured. The method has better fairness and expandability, thereby having better deployable characteristics.
Further, an embodiment of the present invention further provides an information sharing apparatus in a spatial information network, and with reference to fig. 5, the apparatus includes:
the first acquisition module 11 is used for acquiring a current credit value of a target satellite by a current satellite, wherein the credit value is obtained by updating a control center of a space network according to data transmitted by each satellite in history, and the target satellite is selected by the current satellite according to a topological relation of the space network;
the first judging module 12 judges whether the target satellite is reliable or not based on the credit value of the current satellite and the current credit value of the target satellite;
the sharing negotiation module 13, if the target satellite is judged to be reliable, carries out sharing negotiation with the target satellite;
the information sharing module 14 is configured to, when the sharing negotiation result fed back by the target satellite is received as sharing, perform physical layer information sharing between the current satellite and the target satellite;
and a credit value updating module 15, which updates the credit value of the current satellite after the current satellite shares information with the target satellite, so that the current satellite performs a sharing operation in a time slot next to the current time slot by the credit value of the current satellite after updating.
The credit update module 15 includes:
the updating submodule updates the number of satellites sharing information with the current satellite in the space network to obtain the updated number of satellites;
the first judgment submodule is used for judging whether the number of the updated satellites meets an updating condition or not, wherein the updating condition is used for updating the credit value of the current satellite;
and the credit value updating submodule updates the credit value of the current satellite if the credit value updating submodule judges that the updating condition is met.
The device for sharing information in the spatial network further comprises:
the second acquisition module is used for acquiring a shared information probability distribution vector by the current satellite, wherein the shared information probability distribution vector comprises the probability of information sharing between the current satellite and each satellite in the space network;
and the second judgment module judges whether the current satellite shares information with the target satellite according to the probability distribution vector of the shared information, and if so, the current satellite shares negotiation with the target satellite.
The device for sharing information in the spatial network further comprises:
and the updating module is used for updating the shared information probability distribution vector so that the current satellite determines whether the current satellite shares information with the target satellite through the updated shared information probability distribution vector in the next time slot of the current time slot.
The update module includes:
the first determining submodule determines a state parameter of the current satellite in the current time slot based on the credit value of the current satellite in the current time slot, wherein the state parameter is used for indicating whether the current satellite can provide real physical layer information or not;
the second determining submodule determines a utility function of the current satellite in the current time slot based on the state parameter of the current satellite in the current time slot;
the updating submodule updates the observation state of the current satellite in the current time slot based on the utility function of the current satellite to obtain the observation state of the current satellite in the next time slot;
a second judging submodule for judging whether the observation state of the next time slot and the observation state of the current time slot satisfy a preset condition, wherein the preset condition is thatη indicate the tolerance of the current satellite,indicating the current satellite's observation state at the current time slot,representing the observation state of the current satellite in the next time slot;
and the third determining submodule determines the shared information probability of the current satellite in the next time slot if the third determining submodule judges that the preset condition is met, and determines the shared information probability of the next time slot as the updated shared information probability.
The second determination submodule includes:
a construction unit for constructing a formulaConstructing a utility function of the current satellite in the current time slot, wherein the state parameter isWhen the current satellite provides real physical layer information in the time slot which is the last time slot of the current time slot, and the state parameter isWhen the state parameter isWhen the state parameter is false, the current satellite provides false physical layer information in the last time slotWhen the current satellite provides false physical layer information at the current time slot, c represents the energy consumption when the current satellite shares the physical layer information, G represents the preset reward of the current satellite, and pijRepresenting the probability that the current satellite is connected to the target satellite.
The update submodule includes:
an updating unit based on the utility function of the current satellite in the current time slot according to the formulaUpdating the observation state of the current satellite in the current time slot to obtain the observation state of the current satellite in the next time slot, wherein,indicating the current satellite's observation state at the current time slot,represents the utility function of the current satellite at the current time slot,indicating the learning rate of the current satellite at the current time slot,indicating that the current satellite shares information with the target satellite at the current time slot,indicating that the current satellite does not share information with the target satellite at the current time slot.
The third determination submodule includes:
a determination unit for determining the formulaDetermining the probability of sharing information of the current satellite in the next time slot, wherein,the exploration capability of the current satellite in the current time slot is shown, and the exploration capability is the capability of the current satellite in exploring an exploration target.
The apparatus for sharing information in a spatial network provided in an embodiment of the present invention includes a computer-readable storage medium storing a program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiment, and specific implementation may refer to the method embodiment, which is not described herein again.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The functions, if implemented in the form of software functional units 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 invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. An information sharing method in a spatial information network is characterized by comprising the following steps:
the method comprises the steps that a current satellite obtains a current credit value of a target satellite, wherein the credit value is obtained by updating a control center of a space network according to data transmitted by each satellite in history, and the target satellite is selected by the current satellite according to a topological relation of the space network;
judging whether the target satellite is reliable or not based on the credit value of the current satellite and the current credit value of the target satellite;
if the target satellite is judged to be reliable, sharing negotiation is carried out with the target satellite;
when the sharing negotiation result fed back by the target satellite is received to be shared, the current satellite and the target satellite share physical layer information;
and after the current satellite shares information with the target satellite, updating the credit value of the current satellite, so that the current satellite performs sharing operation in the next time slot of the current time slot through the updated credit value of the current satellite.
2. The method of claim 1, wherein updating the credit value for the current satellite comprises:
updating the number of satellites in the space network which share information with the current satellite to obtain the updated number of satellites;
judging whether the number of the updated satellites meets an updating condition or not, wherein the updating condition is used for updating the credit value of the current satellite;
and if the updating condition is judged to be met, updating the credit value of the current satellite.
3. The method of claim 1, wherein after determining that the target satellite is reliable, the method further comprises:
the current satellite acquires a shared information probability distribution vector, wherein the shared information probability distribution vector comprises the probability of information sharing between the current satellite and each satellite in the space network;
and the current satellite judges whether to share information with the target satellite according to the probability distribution vector of the shared information, and if so, the current satellite performs sharing negotiation with the target satellite.
4. The method of claim 1, wherein after the physical layer information sharing between the current satellite and the target satellite, the method further comprises:
and updating the shared information probability distribution vector so that the current satellite determines whether the current satellite shares information with the target satellite through the updated shared information probability distribution vector in the time slot next to the current time slot.
5. The method of claim 4, wherein updating the shared information probability distribution vector comprises:
determining a state parameter of the current satellite at the current time slot based on the credit value of the current satellite at the current time slot, wherein the state parameter is used for indicating whether the current satellite can provide real physical layer information or not;
determining a utility function of the current satellite at the current time slot based on the state parameter of the current satellite at the current time slot;
updating the observation state of the current satellite in the current time slot based on the utility function of the current satellite to obtain the observation state of the current satellite in the next time slot;
judging whether the observation state of the next time slot and the observation state of the current time slot meet preset conditions or not, wherein the preset conditions areη indicate the tolerance of the current satellite,represents an observation state of the current satellite at the current time slot,representing an observation state of the current satellite at the next time slot;
and if the preset condition is met, determining the shared information probability of the current satellite in the next time slot, and determining the shared information probability of the next time slot as the updated shared information probability.
6. The method of claim 5, wherein determining the utility function for the current satellite at the current time slot based on the state parameter of the current satellite at the current time slot comprises:
according to the formulaConstructing a utility function of the current satellite in the current time slot, wherein when the state parameter isWhen the state parameter is equal to the current time slot, the current satellite provides real physical layer information at the time slot which is the last time slot of the current time slotWhen the state parameter is equal toWhen the state parameter is the last time slot, the current satellite provides false physical layer informationRepresenting that the current satellite provides false physical layer information at the current time slot, c representing energy consumption when the current satellite shares the physical layer information, G representing a preset reward of the current satellite, pijRepresenting a probability that the current satellite is connected to the target satellite.
7. The method of claim 3, wherein updating the observation state of the current satellite at the current time slot based on the utility function of the current satellite, and wherein obtaining the observation state of the current satellite at the next time slot comprises:
based on utility function of the current satellite at the current time slot, according to formulaUpdating the observation state of the current satellite in the current time slot to obtain the observation state of the current satellite in the next time slot, wherein,represents an observation state of the current satellite at the current time slot,a utility function representing the current satellite at the current time slot,represents a learning rate of the current satellite at the current time slot,indicating that the current satellite shares information with the target satellite at the current time slot,indicating that the current satellite does not share information with the target satellite at the current time slot.
8. The method of claim 5, wherein determining the probability of information sharing for the current satellite in the next time slot comprises:
according to the formulaDetermining the probability of sharing information for the current satellite at the next time slot, wherein,and representing the exploration capability of the current satellite in the current time slot, wherein the exploration capability is the capability of the current satellite to explore an exploration target.
9. An information sharing apparatus in a spatial information network, comprising:
the system comprises an acquisition module, a data acquisition module and a data transmission module, wherein the current satellite acquires a current credit value of a target satellite, the credit value is obtained by updating a control center of a space network according to data transmitted by each satellite in history, and the target satellite is selected by the current satellite according to a topological relation of the space network;
the judging module is used for judging whether the target satellite is reliable or not based on the credit value of the current satellite and the current credit value of the target satellite;
the sharing negotiation module carries out sharing negotiation with the target satellite if the target satellite is judged to be reliable;
the information sharing module is used for sharing the physical layer information between the current satellite and the target satellite when the sharing negotiation result fed back by the target satellite is received;
and the credit value updating module is used for updating the credit value of the current satellite after the current satellite shares information with the target satellite so that the current satellite performs sharing operation through the updated credit value of the current satellite in a time slot next to the current time slot.
10. The apparatus of claim 9, wherein the credit update module comprises:
the updating submodule updates the number of satellites in the space network, which share information with the current satellite, so as to obtain the updated number of satellites;
the first judgment submodule is used for judging whether the number of the updated satellites meets an updating condition or not, wherein the updating condition is used for updating the credit value of the current satellite;
and the credit value updating submodule updates the credit value of the current satellite if the updating condition is judged to be met.
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CN105846884A (en) * 2016-03-01 2016-08-10 山东航天电子技术研究所 Network communication method applicable to space-based network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8320829B1 (en) * 2009-06-22 2012-11-27 The Boeing Company Enabling on-demand inter-spacecraft resource sharing and coordination
CN105337655A (en) * 2015-10-21 2016-02-17 北京华胜天成信息技术发展有限公司 Satellite confirmation method, controller and satellite confirmation system
CN105846884A (en) * 2016-03-01 2016-08-10 山东航天电子技术研究所 Network communication method applicable to space-based network

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