CN106533541B - Information sharing method and device in Information Network - Google Patents

Abstract

The present invention provides information sharing method and device in a kind of Information Network, this method includes that present satellites obtain the current credit value of target satellite；The current credit value of credit value and target satellite based on present satellites, judges whether target satellite is reliable；If it is judged that target satellite is reliable, then shared negotiation is carried out with target satellite；When the shared negotiation result for receiving target satellite feedback is to be shared, present satellites and target satellite carry out physical layer information and share；After carrying out information sharing with target satellite, the credit value of present satellites is updated.This method can effectively prevent propagation of the false physical layer information in spatial network, reduce influence of the false physical layer information to network, it alleviates in existing spatial network, when inter-satellite information sharing, the larger technical problem of the probability of the deceptive information provided.

Description

Information sharing method and device in spatial information network

technical field

The present invention relates to the technical field of satellite communications, in particular to a method and device for sharing information in a space information network.

Background technique

With the increase of satellite business, the traditional single-satellite transmission mode can no longer meet the requirements. In order to improve the transmission efficiency of satellites, it is necessary to communicate between satellites and between satellites and ground stations. The traditional ground networking of satellites moving at high speed is no longer applicable. With the development of satellite technology and the increase in the number of satellites, new requirements have also been put forward for satellite networking technology. Information sharing in satellite space networks is a part of satellite networking technology. In the space network, the link information and channel conditions between satellites and satellites (such as relay satellites) and between satellites and ground stations are of great significance for satellite networking transmission.

Different from the terrestrial network, the satellites in the space network move at high speed, and the connection relationship between any two points in the network is dynamic and time-varying. At the same time, the factors that affect the inter-satellite and satellite-ground channel conditions are very complex (such as climatic conditions), which makes the information sharing in the space network depend on the cooperative transmission between satellites. In the process of information sharing, satellites can obtain some physical characteristics of the transmission channel, and make full use of the physical layer information of the space network (mainly including the topology, link information, and channels between satellites), which can make the bit error rate of information transmission the lowest, The transmission path delay may be the smallest, which can improve transmission efficiency. Therefore, the real physical layer information is very important for efficient transmission. In order to improve the transmission efficiency, the satellite will usually notify the control node in the space network of its own link and channel information, but there may also be some nodes, in order to expand their own interests (such as: higher width, smaller delay) ), providing false physical layer information.

At present, many information sharing mechanisms have been proposed, such as: storage broadcast mechanism. But the scenarios for these mechanisms are limited to terrestrial networks. In the existing mechanisms, it is assumed that each satellite adopts a cooperative and cooperative manner to achieve a win-win situation in order to maximize the overall interests (eg, minimum transmission delay, maximum throughput, etc.). However, once malicious nodes (ie satellites) appear in order to obtain additional bandwidth or reduce delay, false channel or link information will be generated. In the existing space network, satellites have a high probability of providing false information.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a method and device for sharing information in a space information network, so as to alleviate the technical problem that the probability of satellites providing false information is high in the existing space network.

In a first aspect, an embodiment of the present invention provides an information sharing method in a spatial information network, including:

The current satellite obtains the current credit value of the target satellite, wherein the credit value is obtained by updating the control center of the space network according to the historical data transmitted by each satellite, and the target satellite is the current satellite according to the topology of the space network. relationship selected;

Based on the credit value of the current satellite and the current credit value of the target satellite, determine whether the target satellite is reliable;

If it is determined that the target satellite is reliable, a sharing negotiation is performed with the target satellite;

When the sharing negotiation result fed back by the target satellite is received, the current satellite and the target satellite share physical layer information;

After the current satellite shares information with the target satellite, the credit value of the current satellite is updated, so that the current satellite passes the updated credit value of the current satellite in the next time slot of the current time slot. value to perform a shared operation.

In conjunction with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein updating the credit value of the current satellite includes:

updating the number of satellites that share information with the current satellite in the space network to obtain the updated number of satellites;

Judging whether the number of satellites after the update satisfies the update condition, wherein the update condition is used to update the credit value of the current satellite;

If it is determined that the update condition is satisfied, the credit value of the current satellite is updated.

In conjunction with the first aspect, the embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein, after determining that the target satellite is reliable, the method further includes:

The current satellite obtains a shared information probability distribution vector, and the shared information probability distribution vector includes the probability of the current satellite sharing information with each satellite in the space network;

The current satellite determines whether to share information with the target satellite according to the probability distribution vector of the shared information, and if it is determined to be yes, performs a sharing negotiation with the target satellite.

In conjunction with the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein after the current satellite and the target satellite share physical layer information, the method further includes:

Update the shared information probability distribution vector, so that the current satellite determines whether the current satellite communicates with the target satellite through the updated shared information probability distribution vector in the next time slot of the current time slot shared.

In conjunction with the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein updating the shared information probability distribution vector includes:

Determine 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 to indicate whether the current satellite can provide real physical layer information;

determining the 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;

Based on the utility function of the current satellite, update 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;

Determine 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 n represents the tolerance of the current satellite, represents the observation state of the current satellite in the current time slot, represents the observation state of the current satellite in the next time slot;

If it is determined that the preset condition is met, the probability of sharing information of the current satellite in the next time slot is determined, and the probability of sharing information of the next time slot is determined to be the updated shared information probability.

In conjunction with the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the utility of the current satellite in the current time slot is determined based on a state parameter of the current satellite in the current time slot Functions include:

According to the formula Construct the utility function of the current satellite in the current time slot, wherein when the state parameter is , it means that the current satellite provides real physical layer information in the previous time slot of the current time slot, when the state parameter is When it means that the current satellite provides real physical layer information in the current time slot, when the state parameter is , it means that the current satellite provides false physical layer information in the last time slot, when the state parameter is , indicates that the current satellite provides false physical layer information in the current time slot, c indicates the energy consumption when the current satellite shares the physical layer information, G indicates the preset reward of the current satellite, p _ij indicates the current satellite The probability that a satellite is in communication with the target satellite.

With reference to the first aspect, the embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein, based on the utility function of the current satellite, the observation state of the current satellite in the current time slot is updated , and obtaining the observation status of the current satellite in the next time slot includes:

Based on the utility function of the current satellite in the current time slot, according to the formula Update the observation state of the current satellite in the current time slot, and update the observation state of the current satellite in the next time slot, wherein, represents the observation state of the current satellite in the current time slot, represents the utility function of the current satellite in the current time slot, represents the learning rate of the current satellite in the current time slot, indicates that the current satellite and the target satellite share information in the current time slot, Indicates that the current satellite does not share information with the target satellite in 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, wherein determining the probability of sharing information of the current satellite in the next time slot includes:

According to the formula determine the shared information probability of the current satellite in the next time slot, wherein, Indicates the exploration capability of the current satellite in the current time slot, where the exploration capability is the capability of the current satellite to detect the detection target.

In a second aspect, an embodiment of the present invention further provides an information sharing device in a spatial information network, including:

The acquisition module, the current satellite acquires the current credit value of the target satellite, wherein the credit value is obtained by the control center of the space network updated according to the historical transmission data of each satellite, and the target satellite is the current satellite according to the space network. The topology relationship of the network is selected;

Judging module, based on the credit value of the current satellite and the current credit value of the target satellite, to determine whether the target satellite is reliable;

a sharing negotiation module, if it is judged that the target satellite is reliable, it performs a sharing negotiation with the target satellite;

an information sharing module, configured to perform physical layer information sharing between the current satellite and the target satellite when the sharing negotiation result fed back by the target satellite is received;

The credit value update module, after the current satellite shares information with the target satellite, updates the credit value of the current satellite, so that the current satellite passes the update after the update in the next time slot of the current time slot. Perform the sharing operation based on the credit value of the current satellite.

In conjunction with the second aspect, an embodiment of the present invention provides a first possible implementation manner of the second aspect, wherein the credit value update module includes:

an update submodule, which updates the number of satellites that share information with the current satellite in the space network, and obtains the updated number of satellites;

a first judging submodule for judging whether the number of satellites after the update satisfies an update condition, wherein the update condition is used to update the credit value of the current satellite;

The credit value update sub-module, if it is determined that the update condition is met, updates the credit value of the current satellite.

The embodiment of the present invention brings the following beneficial effects: a method and device for sharing information in a space information network provided by the embodiment of the present invention, the information sharing method in the space information network comprises: the current satellite obtains the current credit value of the target satellite, wherein , the credit value is obtained by the control center of the space network based on the historical transmission data of each satellite, and the target satellite is selected by the current satellite according to the topological relationship of the space network; based on the credit value of the current satellite and the current credit value of the target satellite, the judgment Whether the target satellite is reliable; if it is judged that the target satellite is reliable, it will conduct sharing negotiation with the target satellite; when the sharing negotiation result fed back by the target satellite is shared, the current satellite will share the physical layer information with the target satellite; After the target satellite performs information sharing, the credit value of the current satellite is updated, so that the current satellite is determined to perform the sharing operation by the updated credit value of the current satellite in the next time slot of the current time slot;

Compared with the existing space network, when the information is shared between satellites, the probability of providing false information is higher, in the present invention, the current satellite first obtains the current credit value of the target satellite, and then judges the target satellite based on the current credit value of the target satellite. Whether it is reliable, if it is reliable, the current satellite and the target satellite conduct sharing negotiation, and then when the sharing negotiation result fed back by the target satellite is sharing, the current satellite and the target satellite share physical layer information, and finally, after the information is shared, according to the sharing result Update the credit value of the current satellite. The method can make the information sharing between satellite groups in the space network more reliable, effectively prevent the spread of false physical layer information in the space network, and reduce the impact of false physical layer information on the network, that is, alleviate the existing In the space network, there is a high probability that satellites provide false information.

Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent 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 description, claims and drawings.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

1 is a flowchart of a method for sharing information in a spatial information network according to an embodiment of the present invention;

2 is a flowchart of updating the credit value of a current satellite provided by an embodiment of the present invention;

3 is a flowchart of another method for sharing information in a space network after judging that the target satellite is reliable, provided by an embodiment of the present invention;

4 is a flowchart of updating a shared information probability distribution vector provided by 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-first acquisition module; 12-first judgment module; 13-share negotiation module; 14-information sharing module; 15-credit value update module.

Detailed ways

In order to make the purposes, 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. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

At present, in the prior art, the information sharing in the space network generally does not consider the credibility of the information, so the probability of false information spreading is relatively high. Based on this, an information sharing method in a space information network provided by an embodiment of the present invention can make information sharing between two satellites in a space network more reliable, and effectively prevent false physical layer information from being shared in the space network. Propagation, reducing the impact of false physical layer information on the network.

In order to facilitate the understanding of this embodiment, a method for sharing information in a spatial information network disclosed in the embodiment of the present invention is first introduced in detail.

An information sharing method in a spatial information network, with reference to FIG. 1 , the method includes:

S101, the current satellite obtains the current credit value of the target satellite, wherein the credit value is obtained by the control center of the space network according to the historical transmission data of each satellite, and the target satellite is selected by the current satellite according to the topological relationship of the space network;

In the embodiment of the present invention, the space network is formed by a network of multiple satellites. The information shared by the information sharing here is mainly the physical layer information of the space network, and the physical layer information mainly includes the topology structure, link information and channel information between satellites. The real physical layer information is very important for the efficient transmission of networking, and the false physical layer information will affect the access selection of other satellites, the channel allocation of the relay satellites, and the routing selection in the space network, etc. The delay becomes large and even paralyzed.

In the embodiment of the present invention, the concept of satellite credit value is introduced, and the probability of sharing real physical layer information between satellites can be increased through the analysis of the credit value, and the spread of false physical layer information in the space network can be effectively prevented. Specifically, the credit value of each satellite can be stored by a control center, and each satellite can obtain the credit value of other satellites from the control center, wherein the control center can be a relay satellite or other satellites, the present invention implements The example does not impose specific restrictions on it.

In addition, it should be noted that the credit value of the satellite is not static, and the credit value of the satellite changes with time. That is to say, if in the current time slot, the credit values of the current satellite and the target satellite are large enough, two able to 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 can still meet the conditions for information sharing, that is, if the current time slot and the target satellite share information, it does not mean that the In a time slot, the two satellites can still share information, so the information sharing between satellites in the present invention is an iterative algorithm that changes with the time slot.

S102. Based on the credit value of the current satellite and the current credit value of the target satellite, determine whether the target satellite is reliable; if it is determined that the target satellite is unreliable, go to step S1031; if it is determined that the target satellite is reliable, go to step S1032.

After the current satellite obtains the credit value of the target satellite, it is determined whether the target satellite is reliable, that is, whether the credit value of the target satellite meets the preset threshold for information sharing between the current satellite and other satellites.

S1031, the current satellite and the target satellite do not share information;

S1032, the current satellite and the target satellite conduct sharing negotiation;

If the credit value of the target satellite satisfies the preset threshold for information sharing between the current satellite and other satellites, it can be concluded that the target satellite is reliable and will conduct sharing negotiation with the target satellite. Specifically, the purpose of the sharing negotiation is to determine whether the credit value of the current satellite is not. It also meets the preset threshold for information sharing between the target satellite and other satellites. That is to say, after the current satellite determines that the target satellite is reliable, the current satellite has the willingness to share information with the target satellite, and at the same time, it is also necessary to determine whether the target satellite also has the willingness to share information with the target satellite. Wherein, the present invention does not specifically limit the preset thresholds for information sharing between the current satellite and the target satellite and other satellites.

S104. When the sharing negotiation result fed back by the target satellite is shared, the current satellite and the target satellite perform physical layer information sharing;

When the sharing negotiation result fed back by the target satellite is to share, it means that the target satellite also has the willingness to share information with the current satellite, and then the current satellite and the target satellite share information.

S105. Update the credit value of the current satellite, so that the current satellite performs the sharing operation by using the updated credit value of the current satellite in the next time slot of the current time slot.

After information sharing, the current satellite updates its own credit value, and through the updated credit value of the current satellite, it can be further determined whether the current satellite in the next time slot is reliable, and then the sharing operation of the next time slot is completed. In the same way, the target satellite will also update its own credit value.

An information sharing method in a space information network provided by an embodiment of the present invention, the information sharing method in the space information network includes: the current satellite obtains the current credit value of the target satellite, wherein the credit value is the control center of the space network according to the history of each satellite. The transmitted data is updated to obtain that the target satellite is the current satellite selected according to the topological relationship of the space network; based on the credit value of the current satellite and the current credit value of the target satellite, it is judged whether the target satellite is reliable; if it is judged that the target satellite is reliable, then Carry out sharing negotiation with the target satellite; when the sharing negotiation result fed back by the target satellite is shared, the current satellite shares the physical layer information with the target satellite; after the current satellite shares information with the target satellite, the credit value of the current satellite is performing an update, so that the current satellite is determined to perform a sharing operation in the next time slot of the current time slot by determining the credit value of the current satellite after the update;

Compared with the existing space network, when the information is shared between satellites, the probability of providing false information is higher, in the embodiment of the present invention, the current satellite first obtains the current credit value of the target satellite, and then based on the current credit value of the target satellite. Determine whether the target satellite is reliable, among which, if it is reliable, the current satellite and the target satellite conduct sharing negotiation, and then when the sharing negotiation result fed back by the target satellite is to share, the current satellite and the target satellite share physical layer information, and finally, in the information sharing After that, update the credit value of the current satellite.

The information sharing method in the space information network provided in the embodiment of the present invention can make the information sharing among the satellite groups in the space network more reliable, effectively prevent the spread of false physical layer information in the space network, and reduce the false physical layer information. The impact of information on the network alleviates the technical problem that satellites provide false information in the existing space network.

The above content briefly describes the information sharing method in the spatial information network as a whole, and the steps involved are described in detail below. Referring to Figure 2, updating the credit value of the current satellite includes:

S201. Update the number of satellites in the space network that share information with the current satellite to obtain the updated number of satellites;

After the current satellite shares information with the target satellite, the number of satellites that share information with the current satellite is updated. Among them, the number of satellites sharing information with the current satellite is updated to obtain

S202, judging whether the number of satellites after the update satisfies the update condition, wherein the update condition is used to update the credit value of the current satellite; if it is judged that the update condition is met, go to step S2031, if it is judged that the update condition is not met, go to step S202 S2032;

The above update conditions are in, Represents the number of satellites that share information with the current satellite after the update, and n _th represents the threshold of the number of satellites that share information with the current satellite.

S2031. Update the credit value of the current satellite.

After judging that the number of satellites after the update meets the update conditions, the credit value of the current satellite is calculated according to the formula to update where, is the credit value of the current satellite in the current time slot, is the credit value of the current satellite in the next time slot, Δr _i is the credit value step of the current satellite, which is preset, and its value is greater than 0, which increases the credit value of the current satellite and encourages the current satellite to communicate with other satellites. shared. This credit value is used to determine whether the current satellite is reliable for the next time slot.

S2032, do not update the credit value of the current satellite.

Further, with reference to FIG. 3, after judging that the target satellite is reliable, the method further includes:

S301, the current satellite obtains a shared information probability distribution vector, and the shared information probability distribution vector includes the probability of the current satellite and each satellite in the space network sharing information;

After judging that the target satellite is reliable based on the credit value of the target satellite, the present invention also adds an information sharing condition, that is, the sharing information probability distribution vector.

For the space network, the probability distribution _vector of the shared information of the current satellite is _{qi = [q i1 , q i2 ......} In the example, i represents the current satellite, j represents the target satellite, and q _ij can represent the probability of the current satellite and the target satellite sharing information. After each information sharing, the value of _qi is updated.

S302, the current satellite judges whether to share information with the target satellite according to the probability distribution vector of the shared information; if it is judged to be yes, go to step S303, if it is judged to be no, go to step S304;

S303, the current satellite and the target satellite conduct sharing negotiation;

S304, the current satellite does not perform sharing negotiation with the target satellite.

After obtaining the shared information probability distribution vector, qi _ij determines whether to share information with the target satellite, and if it is judged to be yes, then performs 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 q _j , and according to the i-th component q _ji in the shared information probability distribution vector, it is judged whether to share information with the current satellite. Then the current satellite and the target satellite can share information.

At this time, the jth component of a _i =[a _i1 ,a _i2 ......a _iN ] in the current satellite is 1, that is, a _ij =1, that is, the current satellite and the target satellite share information.

Further, after the physical layer information is shared between the current satellite and the target satellite, the method further includes:

The shared information probability distribution vector is updated, so that the current satellite determines whether the current satellite performs information sharing with the target satellite through the updated shared information probability distribution vector in the next time slot of the current time slot.

Specifically, after the physical layer information is shared between the current satellite and the target satellite, updating the shared information probability distribution vector is essentially the jth component in the update vector.

Further, referring to Figure 4, updating the shared information probability distribution vector includes:

S401, determine the 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 to indicate whether the current satellite can provide real physical layer information;

Each satellite has two states, where s ₀ indicates that the satellite provides real physical layer information, and s ₁ indicates that the satellite provides false physical layer information. Each satellite has an initial (or the last time slot of the current time slot) state parameter, the credit value is between 0 and 1, and the obtained current credit value is used to determine the current satellite at the current time according to the random algorithm. slot state parameters.

S402, determine the 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 formula Construct the utility function of the current satellite in the current time slot, where the state parameter is , it means that the current satellite provides real physical layer information in the previous time slot of the current time slot, when the state parameter is , it means that the current satellite provides real physical layer information in the current time slot, when the state parameter is , it means that the current satellite provides false physical layer information in the last time slot, when the state parameter is When , indicates that the current satellite provides false physical layer information in the current time slot, c indicates the energy consumption when the current satellite shares the physical layer information, G indicates the preset reward of the current satellite, and p _ij indicates the probability that the current satellite is connected to the target satellite.

After the state parameters of the current satellite in the current time slot are determined, and the state parameters of the current satellite in the previous time slot of the current time slot are known, so the utility function of the current satellite in the current time slot can be determined according to the two state parameters, Specifically, the two state parameters can be substituted into the formula of the above utility function.

Among them, in order to motivate 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 that the current satellite is connected to the target satellite can be calculated through the satellite link model:

G=(V,E,P), where G represents the topological structure of the distributed constellation, V represents the nodes in the space network, namely satellites, which is a set of points; E represents the communication link between satellites, according to whether the distance If it is less than the communication distance, it determines whether the link exists or not, and represents the set of edges; P represents the probability that two satellites are connected, and the element p _ij of P represents the probability that the current satellite is connected to the target satellite.

There are two situations in which the link is interrupted:

(1) When the current satellite and other satellites in the space network are not visible;

(2) When the channel SNR is less than a certain threshold γ.

Consider the connection between the current satellite and the target satellite:

The channel model between satellites is the Rayleigh model, and the signal-to-noise ratio is expressed as:

in,

The probability of connection interruption is:

Among them, Δ represents the sum of the interference of other satellites and noise interference, the channel between satellites obeys the Rayleigh channel model, so h _ij obeys the exponential distribution, and a _ij is the channel loss parameter.

S403, based on the utility function of the current satellite, update 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;

In the embodiment of the present invention, based on the utility function of the current satellite in the current time slot, according to the formula Update the observation state of the current satellite in the current time slot, and update the observation state of the current satellite in the next time slot, where, represents the observation status of the current satellite in the current time slot, represents the utility function of the current satellite in the current time slot, represents the learning rate of the current satellite in the current time slot, Indicates that the current satellite and the target satellite share information in the current time slot, Indicates that the current satellite does not share information with the target satellite in the current time slot.

Specifically, after obtaining the utility function of the current satellite in the current time slot, according to the condition of whether the current satellite has shared information with the target satellite in the current time slot, the observation state of the current satellite in the current time slot is updated to obtain the current The observation status of the satellite in the next time slot. Specifically, the obtained utility function of the current satellite in the current time slot can be brought into the corresponding formula. in, Indicates the learning rate of the current satellite in the current time slot, which is a quantity characterizing the performance parameters of the current satellite and can be preset.

S404. Determine 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 η represents the tolerance of the current satellite, represents the observation status of the current satellite in the current time slot, Indicates the observation status 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 it is determined whether the two meet the preset conditions according to the observation state of the next time slot and the observation state of the current time slot. η represents the tolerance of the current satellite, and the size of the value is also preset.

S405. If it is determined that the preset condition is met, determine the shared information probability of the current satellite in the next time slot, and determine that the shared information probability of the next time slot is the updated shared information probability.

Specifically, according to the formula Determine the shared information probability of the current satellite in the next time slot, where, Indicates the exploration ability of the current satellite in the current time slot, and the exploration ability is the ability of the current satellite to detect the detection target.

If the observation state of the next time slot and the observation state of the current time slot meet the preset conditions: According to the formula Determine the probability of sharing information for the current satellite in the next time slot in, is the observation state of the current time slot, which has been obtained before, Indicates the exploration ability of the current satellite in the current time slot, and the exploration ability is the ability of the current satellite to detect the detection target, which is also a preset value.

The embodiment of the present invention provides an information sharing method in a space information network. The key point is that the credibility of the satellite shared information is fully considered, and each satellite is made to select a credible satellite for information sharing through the credit value, which effectively avoids The propagation of false physical layer information in the space network. The scheme effectively reduces the harm of malicious nodes to the space network, and the cooperative selection method based on credit value ensures the credibility of information sharing in the space network and the efficiency of network transmission. This method has better fairness and scalability, and thus has better deployability characteristics.

Further, an embodiment of the present invention also provides an information sharing apparatus in a spatial information network, referring to FIG. 5 , including:

The first acquisition module 11, the current satellite acquires the current credit value of the target satellite, wherein, the credit value is obtained by the control center of the space network according to the historical transmission data of each satellite, and the target satellite is the current satellite selected according to the topological relationship of the space network. out;

The first judgment module 12, based on the credit value of the current satellite and the current credit value of the target satellite, judges whether the target satellite is reliable;

The sharing negotiation module 13, if it is judged that the target satellite is reliable, performs sharing negotiation with the target satellite;

The information sharing module 14 is used to share 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;

The credit value updating module 15, after the current satellite performs information sharing with the target satellite, updates the credit value of the current satellite, so that the current satellite performs the sharing operation by updating the credit value of the current satellite in the next time slot of the current time slot .

The credit value update module 15 includes:

Update the sub-module, update the number of satellites that share information with the current satellite in the space network, and obtain the updated number of satellites;

The first judgment submodule is used to judge whether the number of satellites after the update meets the update condition, wherein the update condition is used to update the credit value of the current satellite;

The credit value update sub-module, if it is judged that the update condition is met, updates the credit value of the current satellite.

The information sharing device in the space network also includes:

The second obtaining module, the current satellite obtains a probability distribution vector of shared information, and the probability distribution vector of shared information includes the probability that the current satellite and each satellite in the space network share information;

In the second judgment module, the current satellite judges whether to share information with the target satellite according to the probability distribution vector of the shared information, and if it is judged to be yes, negotiate with the target satellite for sharing.

The information sharing device in the space network also includes:

The updating module is used for updating the shared information probability distribution vector, so that the current satellite determines whether the current satellite performs information sharing with the target satellite through the updated shared information probability distribution vector in the next time slot of the current time slot.

Update modules include:

The first determination submodule determines the 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 to indicate whether the current satellite can provide real physical layer information;

The second determines the submodule, determines the 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 update sub-module, based on the utility function of the current satellite, updates the observation state of the current satellite in the current time slot, and obtains the observation state of the current satellite in the next time slot;

The second judgment sub-module is used to judge whether the observation state of the next time slot and the observation state of the current time slot satisfy the preset condition, wherein the preset condition is η represents the tolerance of the current satellite, represents the observation status of the current satellite in the current time slot, Indicates the observation status of the current satellite in the next time slot;

The third determination sub-module determines the shared information probability of the current satellite in the next time slot, and determines the shared information probability of the next time slot as the updated shared information probability if it is determined that the preset condition is met.

The second determination submodule includes:

Building units for formulas based on Construct the utility function of the current satellite in the current time slot, where the state parameter is , it means that the current satellite provides real physical layer information in the previous time slot of the current time slot, when the state parameter is , it means that the current satellite provides real physical layer information in the current time slot, when the state parameter is , it means that the current satellite provides false physical layer information in the last time slot, when the state parameter is When , indicates that the current satellite provides false physical layer information in the current time slot, c indicates the energy consumption when the current satellite shares the physical layer information, G indicates the preset reward of the current satellite, and p _ij indicates the probability that the current satellite is connected to the target satellite.

Update submodules include:

Update unit, based on the utility function of the current satellite in the current time slot, according to the formula Update the observation state of the current satellite in the current time slot, and update the observation state of the current satellite in the next time slot, where, represents the observation status of the current satellite in the current time slot, represents the utility function of the current satellite in the current time slot, represents the learning rate of the current satellite in the current time slot, Indicates that the current satellite and the target satellite share information in the current time slot, Indicates that the current satellite does not share information with the target satellite in the current time slot.

The third determination sub-module includes:

Determining the unit for use according to the formula Determine the shared information probability of the current satellite in the next time slot, where, Indicates the exploration ability of the current satellite in the current time slot, and the exploration ability is the ability of the current satellite to detect the detection target.

An apparatus for sharing information in a space network provided by an embodiment of the present invention includes a computer-readable storage medium storing program codes, and the instructions included in the program codes can be used to execute the methods described in the foregoing method embodiments. For implementation, reference may be made to the method embodiments, which will not be repeated here.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, for the specific working process of the system and device described above, reference may be made to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In addition, in the description of the embodiments of the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store 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. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

Finally, it should be noted that the above-mentioned embodiments are only specific implementations of the present invention, and are used to illustrate the technical solutions of the present invention, but not to limit them. The protection scope of the present invention is not limited thereto, although referring to the foregoing The embodiment has been described in detail the present invention, those of ordinary skill in the art should understand: any person skilled in the art who is familiar with the technical field within the technical scope disclosed by the present invention can still modify the technical solutions described in the foregoing embodiments. Or can easily think of changes, or equivalently replace some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered in the present invention. within the scope of protection. Therefore, the protection scope of the present invention should be based on 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 through the updated credit value of the current satellite in the time slot next to the current time slot.

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 3, 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, p_ijRepresenting a probability that the current satellite is connected to the target satellite.

7. The method of claim 5, wherein updating the observation state of the current satellite at the current time slot based on the utility function of the current satellite, and 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.