CN117081657A - Air-to-air fusion network-oriented safety emergency communication method and system - Google Patents

Abstract

The application provides an aerospace integration network-oriented safety emergency communication method and system, and a layering unmanned aerial vehicle networking scheme is completed through three stages. The unmanned aerial vehicle is divided into three types of a cluster head unmanned aerial vehicle, a main unmanned aerial vehicle and a slave unmanned aerial vehicle, the cluster head unmanned aerial vehicle is responsible for forwarding control information of a control center to each unmanned aerial vehicle, the main unmanned aerial vehicle is responsible for recovering local communication, and the slave unmanned aerial vehicle is used for expanding coverage. The unmanned aerial vehicles are mainly used for transmitting control signaling through the unmanned aerial vehicle networking links, and when the unmanned aerial vehicles cannot transmit information due to the fact that the unmanned aerial vehicles are far away, the unmanned aerial vehicles are switched to the Beidou communication links to communicate. The unmanned aerial vehicle system and the method have the advantages that unmanned aerial vehicles with lower cost are used for networking, the safety of the unmanned aerial vehicle networking is guaranteed, the safe transmission of control signaling is guaranteed, the efficiency is greatly improved, the safety of emergency communication is guaranteed, the sustainable time of the emergency communication is prolonged, the coverage range of the emergency communication is enlarged, and more reliable communication guarantee is provided for rescue and relief work.

Description

Air-to-air fusion network-oriented safety emergency communication method and system

Technical Field

The application belongs to the technical field of emergency communication, and particularly relates to an aerospace-oriented converged network safety emergency communication method and system.

Background

The Chinese operators are wide, natural disasters occur, and the serious natural disasters often cause large-area and long-time interruption of communication. How to quickly recover communication, eliminate 'communication island', ensure smooth communication in gold rescue time after disaster occurrence, and is a Shensheng responsibility which must be carried by communication management departments and communication enterprises. At present, in disaster relief, emergency communication vehicles are a main communication guarantee means and are widely deployed in various places throughout the country. When the sudden communication is interrupted, the nearest emergency communication vehicle provides emergency rescue, but the sudden natural disaster area is unpredictable, the time for the emergency vehicle to arrive at the site and be put into use is difficult to ensure, and the road damage caused by the disaster can also greatly delay the communication guarantee efficiency of the emergency vehicle. In addition, the coverage radius of the emergency communication vehicle can only reach a range of hundreds of meters, and the communication requirement of personnel in a large-scale disaster-stricken area is difficult to meet.

The traditional emergency communication means comprise radio station communication, digital signal cluster communication, satellite emergency communication and vehicle-mounted emergency communication. The traditional emergency communication means mainly takes a ground device, under the conditions of traffic paralysis and complex geographic environment, the traditional emergency communication system cannot fully exert the efficacy, and satellite communication vehicles, program-controlled exchange vehicles, microwave communication vehicles and the like are difficult to enter the field, so that the communication guarantee and support effects are influenced. Secondly, satellite communication resources are scarce, the cost is high, and the communication terminals are few; the communication of the radio station is easy to be interfered by environmental factors, so that signals cannot be normally returned, even transmitted signals cannot be received, and the working efficiency is seriously affected; the digital signal cluster has limited communication coverage, and the networking is limited by frequency resources.

Under the condition, the emergency communication scheme based on the unmanned aerial vehicle has developed, the defects of the traditional emergency communication scheme are overcome, and the loss caused by sudden disasters is minimized so as to maintain the stability of production and living orders. At present, two types of emergency communication schemes based on unmanned aerial vehicles exist on the market, namely, based on fixed wing unmanned aerial vehicles and tethered unmanned aerial vehicles. These two types of solutions solve some of the limitations suffered by conventional emergency communication schemes when in use. The fixed wing unmanned aerial vehicle has huge volume, higher requirements on conditions such as airports, general aviation control, expenses and the like, and long deployment period; the unmanned aerial vehicle has poor endurance, so that the duration of an emergency communication system is limited; the disaster-affected area cannot be completely covered due to limited coverage; because the signals are indiscriminately covered in the coverage range, the situation of communication blockage can occur in areas with dense people flow. Tethered unmanned aerial vehicles rely on cables to communicate with emergency vehicles, and are limited by the inability of the length and cost of the cables to fly over large distances. In addition, the two emergency communication means lack of a guarantee mechanism for user communication data safety and ground control signaling data safety, so that the data are at risk of being stolen and tampered.

Therefore, a new safety emergency communication scheme is researched, and the realization of safe and rapid networking in disaster areas is very necessary.

Disclosure of Invention

In order to solve the problems in the prior art, the application provides an aerospace fusion network-oriented safety emergency communication method and system. The technical problems to be solved by the application are realized by the following technical scheme:

in a first aspect, the application provides an aerospace-oriented converged network security emergency communication method, which comprises the following steps:

the method comprises the steps that in the preparation stage, a control center selects a networking unmanned aerial vehicle from a plurality of unmanned aerial vehicles, and safety authentication and key negotiation between the networking unmanned aerial vehicle and the control center, between the networking unmanned aerial vehicle and between the networking unmanned aerial vehicle and a Beidou satellite are carried out; the networking unmanned aerial vehicle is divided into a cluster head unmanned aerial vehicle, a master unmanned aerial vehicle and a slave unmanned aerial vehicle; the cluster head unmanned aerial vehicle is responsible for forwarding control information of the control center to each unmanned aerial vehicle, the main unmanned aerial vehicle is responsible for recovering local communication, and the auxiliary unmanned aerial vehicle is used for expanding coverage;

in the cruising stage, the control center issues a cruising task to the networking unmanned aerial vehicle so that the networking unmanned aerial vehicle reaches a target area; the networking unmanned aerial vehicle perceives the distribution state of the user equipment in the target area and feeds back the distribution state to the control center, and the control center generates an unmanned aerial vehicle deployment scheme;

and in the networking stage, the control center issues the generated unmanned aerial vehicle deployment scheme to the networking unmanned aerial vehicle positioned in the target area, and the networking unmanned aerial vehicle completes networking work to form an emergency network.

In a second aspect, the application provides an aerospace-oriented converged network security emergency communication system which comprises a control center and a plurality of unmanned aerial vehicles; the control center performs the following processes in combination with the unmanned aerial vehicle:

the method comprises the steps that in the preparation stage, a control center selects a networking unmanned aerial vehicle from a plurality of unmanned aerial vehicles, and safety authentication and key negotiation between the networking unmanned aerial vehicle and the control center, between the networking unmanned aerial vehicle and between the networking unmanned aerial vehicle and a Beidou satellite are carried out;

in the cruising stage, the control center issues a cruising task to the networking unmanned aerial vehicle so that the networking unmanned aerial vehicle reaches a target area; the networking unmanned aerial vehicle perceives the distribution state of the user equipment in the target area and feeds back the distribution state to the control center, and the control center generates an unmanned aerial vehicle deployment scheme;

and in the networking stage, the control center issues the generated unmanned aerial vehicle deployment scheme to the networking unmanned aerial vehicle positioned in the target area, and the networking unmanned aerial vehicle completes networking work to form an emergency network.

The beneficial effects are that:

1. aiming at the problem that the traditional safety emergency communication system cannot continue to recover communication after infrastructure is destroyed, the application constructs the air-to-ground integration network safety emergency communication method and system by organically combining the unmanned aerial vehicle and the base station and using the Beidou communication technology and the unmanned aerial vehicle networking technology, and provides more reliable communication guarantee for rescue and relief work.

2. Aiming at the problems of high use cost and low efficiency of a safety emergency communication system based on a fixed wing unmanned aerial vehicle, the application utilizes the unmanned aerial vehicle with lower relative cost to carry out networking, ensures the safety of the unmanned aerial vehicle networking, ensures the safe transmission of control signaling and can greatly improve the efficiency.

3. Aiming at the problem that a safe emergency communication system based on a tethered unmanned aerial vehicle cannot completely cover a disaster area, a layering networking mode is adopted to deploy a slave unmanned aerial vehicle under a main unmanned aerial vehicle, so that the coverage area is effectively enlarged, meanwhile, an unmanned aerial vehicle endurance time management system is designed, when a control center monitors that the endurance time of a certain unmanned aerial vehicle reaches a minimum threshold value, a new unmanned aerial vehicle is automatically dispatched to go to work and handover, and the sustainable time of emergency communication is improved.

4. The application has wide application scene, and is suitable for various scenes, including communication interruption conditions generated under emergency conditions such as important holidays, important conferences, large-scale games, important activities, accident disasters, natural disasters and the like.

The present application will be described in further detail with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic view of a specific scenario of an existing fixed wing unmanned aerial vehicle emergency communication system;

fig. 2 is a schematic diagram of a scene of an aerospace integration network security emergency communication method provided by an embodiment of the application.

Fig. 3 is a phase flow chart of a method for secure emergency communication of an aerospace integration network provided by an embodiment of the application;

fig. 4 is a schematic diagram of a link destroy-load sharing scenario of a group of unmanned aerial vehicles provided by an embodiment of the present application;

fig. 5 is a schematic diagram of an offline scenario of link destruction-accident of a group of unmanned aerial vehicles according to an embodiment of the present application;

fig. 6 is a schematic diagram of a group update scenario of a link destruction-resistant of a group of an unmanned aerial vehicle according to an embodiment of the present application;

FIG. 7 is a schematic diagram of an emergency communication scenario in a resume large activity scenario provided by an embodiment of the present application;

FIG. 8 is a schematic diagram of an emergency communication scenario in a recovery flood scenario provided by an embodiment of the present application;

fig. 9 is a schematic diagram of an emergency communication scenario in a forest disaster recovery situation provided by an embodiment of the present application.

Detailed Description

The present application will be described in further detail with reference to specific examples, but embodiments of the present application are not limited thereto.

Before describing the scheme of the application, the technical concept of the application and related expertise are specifically described.

The fixed wing unmanned aerial vehicle emergency communication system mainly comprises a macro base station, an unmanned aerial vehicle platform, a security gateway, an airborne base station, a return terminal and an SP-GW (Serving PDN-Gate Way). In the system structure, a backhaul terminal and an airborne base station are both deployed on an aircraft and used as data transmission and network coverage tools to respectively establish connection with a user terminal and a macro base station to form a signal transmission path. A specific scenario is shown in fig. 1. The following are key components and functions contained in the fixed wing unmanned aerial vehicle emergency communication system:

communication apparatus: including radio transmitters and receivers, for communicating with ground stations or other communication nodes over the radio frequency band. These devices should have a long communication range and stable signal transmission capability.

An antenna system: for receiving and transmitting communication signals. The antenna system should have high gain and directivity to enhance the transmission distance and reception sensitivity of signals.

Communication protocol: rules and standards defining the communication procedures and data formats. Common wireless communication protocols include Wi-Fi, cellular networks (e.g., 4G and 5G), and communication protocols over dedicated frequency bands.

Data link: for transmitting real-time data, such as position, attitude, sensor data, etc., between the drone and the ground station. The data link should have a high bandwidth and low latency to ensure timely transmission of critical data.

Emergency alert button: a button or switch mounted on the drone, upon the occurrence of an emergency, the operator may trigger the emergency communication system by depressing the button to notify the ground station and request assistance.

Fault diagnosis function: emergency communication systems may include fault detection and diagnostic functions for monitoring the status and performance of the communication device and providing an alarm or automatically switching to a standby communication device when a fault is found.

And (3) power backup: to ensure the reliability of the emergency communication system in the event of an unmanned power failure or other power problem, the system may be equipped with a backup power source or battery to provide continued communication capability.

The unmanned aerial vehicle platform with the fixed wings can simultaneously mount 4G/5G communication base stations, communication-in-motion equipment, cameras, radars and other task loads, the unmanned aerial vehicle takes off from an airport, operators remotely control the unmanned aerial vehicle to arrive and hover above a disaster area by utilizing satellite communication, and cellular coverage is provided for the disaster area through directional antennas arranged on the side surfaces of the aircraft, wherein the coverage can reach more than 50 square kilometers. The mobile communication equipment is connected with the satellite by utilizing the transmission link of the bearing base station and is connected with the ground cellular core network, so that services such as emergency broadcast disaster area user external communication and the like facing the disaster area can be provided.

Compared with a ground base station, the environment change adaptive capacity of the unmanned aerial vehicle base station is stronger. Thus, it may be deployed in an area where no information infrastructure or an information infrastructure is destroyed to provide emergency communication services in case of emergency. When serious natural disasters such as mountain floods, earthquakes, tsunamis, typhoons and the like occur, ground base stations are often destructively damaged, disaster area information infrastructure is seriously damaged, normal communication cannot be performed, and rescue action processes are delayed to different degrees. The emergency communication system based on the unmanned aerial vehicle has the advantages of being free from the limitation of disaster area information infrastructure and rapidly providing large-scale reliable communication for disaster areas.

Although the fixed wing unmanned aerial vehicle has strong adaptability, the unmanned aerial vehicle can take off remotely and control remotely and fly directly to the disaster area site without being influenced by the road interruption and other terrains caused by disaster, the fixed wing unmanned aerial vehicle has huge volume, has higher requirements on conditions such as airports, general aviation control, expenses and the like, and has long deployment period; the unmanned aerial vehicle has limited endurance time, so that the sustainable time of the emergency communication system is limited; the disaster-affected area cannot be completely covered due to limited coverage; because the signals are indiscriminately covered in the coverage range, the situation of communication blockage can occur in areas with dense people flow.

The space-sky fusion network-oriented safety emergency communication method and system provided by the application can well solve the defects of the existing emergency communication scheme, and the defects are as follows:

(1) The existing technical scheme has the disadvantages of higher cost and low efficiency. The fixed wing unmanned aerial vehicle is required to be equipped with a special unmanned aerial vehicle airport, the construction cost is high, the daily maintenance cost is high, most of time is spent on round trip when the task is executed, the time for actually providing service is less, and the efficiency is low. (2) the coverage of the existing technical scheme is limited. The traditional emergency communication system mostly depends on ground infrastructure, after ground base equipment is damaged, service cannot be continuously provided, the unmanned aerial vehicle-based emergency communication system is high in requirements on conditions such as airports, general aviation control and expenses, the deployment period is long, and the disaster-affected area cannot be completely covered due to limited coverage. (3) The existing technical scheme has defects in data security and privacy protection. In emergency communication, security and privacy protection of data are critical. However, the prior art may have security holes in the data transmission process, resulting in data leakage or malicious attack.

According to the application, unmanned aircrafts such as unmanned aircrafts and unmanned airships are organically combined with the base station, and the Beidou communication technology is used for constructing an aerospace integration network, so that strong support is provided for emergency communication. The safety of the unmanned aerial vehicle networking and the safety transmission of the control signaling are ensured by a set of unmanned aerial vehicle networking protocol based on a national cryptographic algorithm and a set of control signaling safety transmission protocol which are designed autonomously; the coverage range of emergency communication is increased and the sustainable time of the emergency communication is prolonged through an unmanned aerial vehicle dynamic distribution algorithm and an unmanned aerial vehicle endurance time management system which are designed autonomously; the lightweight security access authentication protocol based on the extended chebyshev chaotic mapping is designed autonomously, so that the problem of concurrent access of massive users is solved; and the positioning detection deception technology is realized, and the control center is ensured to obtain correct unmanned plane group dynamic position information. In addition, the systematicness of the application is greatly enhanced along with the further development of the communication technology and the unmanned aerial vehicle technology, and the system characteristics of iterative update are realized. From the cost aspect, the application adopts the group authentication ideas, the aggregation authentication codes and other technologies, reduces the calculation cost and the signaling cost of the authentication protocol, and proves that the protocol can operate efficiently and reliably through simulation test, and greatly reduces the calculation cost and the signaling cost on the premise of ensuring the safety.

The technical scheme of the application is described in detail below.

With reference to fig. 2 and fig. 3, the application provides an aerospace integration network security emergency communication method, which comprises the following steps:

the method comprises the steps that in the preparation stage, a control center selects a networking unmanned aerial vehicle from a plurality of unmanned aerial vehicles, and safety authentication and key negotiation between the networking unmanned aerial vehicle and the control center, between the networking unmanned aerial vehicle and between the networking unmanned aerial vehicle and a Beidou satellite are carried out;

in the cruising stage, the control center issues a cruising task to the networking unmanned aerial vehicle so that the networking unmanned aerial vehicle reaches a target area; the networking unmanned aerial vehicle perceives the distribution state of the user equipment in the target area and feeds back the distribution state to the control center, and the control center generates an unmanned aerial vehicle deployment scheme;

and in the networking stage, the control center issues the generated unmanned aerial vehicle deployment scheme to the networking unmanned aerial vehicle positioned in the target area, and the networking unmanned aerial vehicle completes networking work to form an emergency network.

Referring to fig. 2, the present application adopts a layering unmanned aerial vehicle networking scheme, and the unmanned aerial vehicles are classified into three types of cluster head unmanned aerial vehicles, master unmanned aerial vehicles and slave unmanned aerial vehicles. The cluster head unmanned aerial vehicle is responsible for forwarding control information of the control center to each unmanned aerial vehicle, the main unmanned aerial vehicle is a network service unmanned aerial vehicle and is responsible for recovering local communication, and the slave unmanned aerial vehicle is used for expanding coverage. The unmanned aerial vehicles are mainly used for transmitting control signaling through the unmanned aerial vehicle networking links, and when the unmanned aerial vehicles cannot transmit information due to the fact that the unmanned aerial vehicles are far away, the unmanned aerial vehicles are switched to the Beidou communication links to communicate. When the system is deployed, firstly, the emergency communication vehicle carries the unmanned aerial vehicle to reach a designated position, the signal intensity and the range of a coverage area are greatly enhanced by adopting a tethered unmanned aerial vehicle lift-off method, secondly, the main unmanned aerial vehicle flies to a disaster area to carry out networking so as to recover communication, and finally, a ground control center decides whether to dispatch the slave unmanned aerial vehicle to expand the coverage range of a communication link according to a scheduling algorithm. After networking is completed, the user equipment can realize communication with the outside through accessing the unmanned aerial vehicle.

In a specific embodiment of the present application, the aerospace-oriented converged network security emergency communication method further includes:

and in the maintenance stage, the control center issues a corresponding maintenance strategy to maintain the emergency network according to the current state of the emergency network.

During the running of the system, the ground control center monitors the state of the unmanned aerial vehicle in real time, namely, sends a new unmanned aerial vehicle to replace the unmanned aerial vehicle with the electric quantity about to be exhausted, or replaces the unmanned aerial vehicle which is lost in contact due to various reasons, so that the stability of a communication link is ensured.

In a specific embodiment of the present application, the control center selects a networking unmanned aerial vehicle from a plurality of unmanned aerial vehicles, and performs security authentication and key negotiation between the networking unmanned aerial vehicle and the control center, between the networking unmanned aerial vehicle and the networking unmanned aerial vehicle, and between the networking unmanned aerial vehicle and a Beidou satellite, including:

the control center selects three types of networking unmanned aerial vehicles of a cluster head unmanned aerial vehicle, a master unmanned aerial vehicle and a slave unmanned aerial vehicle from a plurality of unmanned aerial vehicles;

performing security authentication and key negotiation between the cluster head unmanned aerial vehicle and the control center, between the main unmanned aerial vehicle and the control center and between the main unmanned aerial vehicle and the cluster head unmanned aerial vehicle according to a pre-agreed encryption mode;

and carrying out security authentication between the three types of networking unmanned aerial vehicle and the Beidou satellite according to the authentication mode of the unmanned aerial vehicle and the Beidou satellite.

The preparation stage of the application specifically comprises the following steps: after the control center commands the vehicle to reach the edge of the emergency place, the preparation work is carried out. Firstly, a control center selects a tethered unmanned aerial vehicle as a cluster head unmanned aerial vehicle in unmanned aerial vehicles, and then safety authentication and key negotiation among the cluster head unmanned aerial vehicle and the control center, a main unmanned aerial vehicle and the control center and the main unmanned aerial vehicle and the cluster head unmanned aerial vehicle are completed. And secondly, authenticating each unmanned aerial vehicle with the Beidou satellite, and preparing for safe transmission of control signaling.

In a specific embodiment of the present application, the generating, by the control center, a deployment scenario of the unmanned aerial vehicle includes:

and the control center generates an unmanned aerial vehicle deployment scheme according to the distribution condition of the user equipment and by utilizing a scheduling algorithm.

The cruising phase of the application comprises in particular:

after the unmanned aerial vehicle is ready to be completed, the unmanned aerial vehicle flies to a target area under the command of a ground control center, during the period, the ground control center can monitor the position of the unmanned aerial vehicle in real time, so that the unmanned aerial vehicle is ensured not to be attacked, cruises above the target area after reaching the target area, the perceived distribution condition of user equipment is sent to the control center, and the control center generates a new unmanned aerial vehicle deployment scheme according to a scheduling algorithm.

In a specific embodiment of the present application, the issuing, by the control center, the generated deployment scenario of the unmanned aerial vehicle to the networking unmanned aerial vehicle located in the destination area, and the performing, by the networking unmanned aerial vehicle, networking work to form an emergency network includes:

judging whether the number of networking unmanned aerial vehicles positioned in the target area can meet the deployment scheme of the unmanned aerial vehicles or not;

if yes, the control center issues the generated unmanned aerial vehicle deployment scheme to the networking unmanned aerial vehicle located in the target area;

if not, the control center determines the number and types of the networking unmanned aerial vehicles to be supplemented according to the number of the networking unmanned aerial vehicles located in the target area and the unmanned aerial vehicle deployment scheme;

the control center dispatches the networking unmanned aerial vehicle to the corresponding position of the target area according to the quantity and the type of the networking unmanned aerial vehicles which are required to be supplemented, so that the dispatched networking unmanned aerial vehicle and the adjacent networking unmanned aerial vehicles finish safety authentication and networking work.

The networking stage of the application specifically comprises the following steps:

the control center sends the new unmanned aerial vehicle deployment scheme to each unmanned aerial vehicle, if the number of the unmanned aerial vehicles which are sent out can not realize the new deployment scheme, the control center sends out enough unmanned aerial vehicles again to the corresponding positions in the deployment scheme, and completes security authentication with the adjacent unmanned aerial vehicles, and networking work is completed.

In a specific embodiment of the present application, the issuing, by the control center, a corresponding maintenance policy according to the current state of the emergency network, to maintain the emergency network includes:

and the control center issues corresponding maintenance strategies to maintain the emergency network according to the three current states of the emergency network in group joining, unexpected offline and group updating.

After the emergency communication system is deployed, in order to dynamically cope with the change of the environment and maintain the robustness of the link, the application provides three event processing schemes.

The specific three event processing schemes are as follows:

first, the control center issues a corresponding maintenance policy to maintain the emergency network according to whether the current state of group joining occurs in the emergency network, which includes:

the control center confirms that the emergency network is in the current state of group joining if monitoring that the networking unmanned aerial vehicle is overlarge in load due to simultaneous access of a large number of users and exceeds a load threshold value;

the control center dispatches a plurality of newly-supplemented unmanned aerial vehicles to reach the appointed place of the target area, the newly-supplemented unmanned aerial vehicles and the adjacent networking unmanned aerial vehicles are networked, and connection is established between the newly-supplemented unmanned aerial vehicles and the networking unmanned aerial vehicles exceeding a load threshold; after the networking unmanned aerial vehicle exceeding the load threshold finishes user data exchange, the plurality of newly-supplemented unmanned aerial vehicles perform user connection switching so as to establish data connection with user equipment.

As shown in fig. 4, when the load of the unmanned aerial vehicle is too large due to simultaneous access of massive users, the control center dispatches a plurality of unmanned aerial vehicles to carry out load sharing, after the unmanned aerial vehicle reaches a designated place, the unmanned aerial vehicle firstly carries out networking with the adjacent unmanned aerial vehicle, then establishes connection with the unmanned aerial vehicle with the oversized load, after user data exchange is completed, user connection switching is carried out, and the expansibility of the network is greatly enhanced through the load sharing mode of the unmanned aerial vehicle.

Secondly, the control center issues a corresponding maintenance policy to maintain the emergency network according to the current state of whether the emergency network is unexpected offline, including:

if the cluster head unmanned aerial vehicle is offline accidentally, a main unmanned aerial vehicle connected with the cluster head unmanned aerial vehicle communicates with the control center through a Beidou satellite, and feeds back the current state that the emergency network is offline accidentally due to the offline of the cluster head unmanned aerial vehicle to the control center;

after receiving the current state that the cluster head unmanned aerial vehicle is offline and the emergency network is in unexpected offline, the control center sends a notification to other cluster head unmanned aerial vehicles located in a target area through Beidou satellites so as to inform the other unmanned aerial vehicles of the IDs of the standby cluster head unmanned aerial vehicles; dispatching the standby cluster head unmanned aerial vehicle to reach the appointed place of the target area, and carrying out security authentication and networking work with the main unmanned aerial vehicle;

if the non-cluster head unmanned aerial vehicle is offline accidentally, switching the networking unmanned aerial vehicle or user equipment connected with the non-cluster head unmanned aerial vehicle to an adjacent networking unmanned aerial vehicle;

if the control center monitors that the non-cluster head unmanned aerial vehicle is offline, confirming that an emergency network is in a current state of unexpected offline; and dispatching a new networking unmanned aerial vehicle to reach the appointed place of the target area, and carrying out security authentication and networking work with the adjacent networking unmanned aerial vehicle.

When an unexpected situation occurs, the unmanned aerial vehicle is damaged and is offline, and the control center should immediately send out a new unmanned aerial vehicle to replace the unmanned aerial vehicle.

(1) Unexpected offline of cluster head unmanned aerial vehicle

As shown in fig. 5, after the cluster head unmanned aerial vehicle is unexpectedly offline, the main unmanned aerial vehicle connected with the cluster head unmanned aerial vehicle continues to communicate with the control center through the Beidou satellite, after the control center detects that the cluster head unmanned aerial vehicle is out of line, the standby cluster head unmanned aerial vehicle immediately takes off, the ID of the new cluster head unmanned aerial vehicle is notified to other unmanned aerial vehicles through the Beidou satellite, and after the new cluster head unmanned aerial vehicle reaches a designated place, the safety certification is carried out with the main unmanned aerial vehicle, so that networking is completed.

(2) Unexpected offline of cluster head unmanned aerial vehicle

After unexpected offline of the unmanned aerial vehicle with the non-cluster head, the slave unmanned aerial vehicle or other unmanned aerial vehicles which are connected with the unmanned aerial vehicle are connected recently by the user, after the control center detects that the unmanned aerial vehicle is in a disconnection state, the control center immediately sends out a new unmanned aerial vehicle to the last place of the disconnection unmanned aerial vehicle, and after the unmanned aerial vehicle arrives to be networked with the nearby unmanned aerial vehicle, the user can continue to access.

Thirdly, the control center issues a corresponding maintenance policy to maintain the emergency network according to whether the current state of the group update occurs in the emergency network, which includes:

when the control center monitors that the duration of a certain networking unmanned aerial vehicle reaches a maximum threshold, the control center automatically dispatches a new networking unmanned aerial vehicle to a designated place for work handover; and carrying out protocol exchange between the new networking unmanned aerial vehicle and the networking unmanned aerial vehicle with the duration reaching the maximum threshold value, replacing the networking unmanned aerial vehicle with the duration reaching the maximum threshold value to be integrated into an emergency network, and notifying the networking unmanned aerial vehicle with the duration reaching the maximum threshold value to return to the ground control center.

In order to cope with the defect of limited unmanned aerial vehicle endurance time, the unmanned aerial vehicle endurance time management system is designed, and when a control center monitors that the unmanned aerial vehicle endurance time reaches a minimum threshold value, a new unmanned aerial vehicle is automatically dispatched to go to work and handover as shown in fig. 6. After the new unmanned aerial vehicle arrives at the appointed place, protocol exchange is carried out with the unmanned aerial vehicle with insufficient electric quantity, and after the unmanned aerial vehicle is replaced to be combined into a network, the unmanned aerial vehicle with insufficient electric quantity returns to the ground control center.

The application provides an aerospace-oriented converged network safety emergency communication system which comprises a control center and a plurality of unmanned aerial vehicles, wherein the control center is connected with the unmanned aerial vehicles; the control center performs the following processes in combination with the unmanned aerial vehicle:

the method comprises the steps that in the preparation stage, a control center selects a networking unmanned aerial vehicle from a plurality of unmanned aerial vehicles, and safety authentication and key negotiation between the networking unmanned aerial vehicle and the control center, between the networking unmanned aerial vehicle and between the networking unmanned aerial vehicle and a Beidou satellite are carried out;

in the cruising stage, the control center issues a cruising task issued to the networking unmanned aerial vehicle so that the networking unmanned aerial vehicle reaches a target area; the networking unmanned aerial vehicle perceives the distribution state of the user equipment in the target area and feeds back the distribution state to the control center, and the control center generates an unmanned aerial vehicle deployment scheme;

and in the networking stage, the control center issues the generated unmanned aerial vehicle deployment scheme to the networking unmanned aerial vehicle positioned in the target area, and the networking unmanned aerial vehicle completes networking work to form an emergency network.

The following describes specific details of the method and the system for the aerospace integration network security emergency communication through the practical application scene.

The following are three typical application scenarios for the present work.

As shown in fig. 7: when a large-scale activity is held in a certain place, the rapid increase of the flow of people may cause unstable or even interruption of communication, which is unfavorable for the outside to know the condition of the internal field of the activity in time and inconvenient for the propagation of the activity. In order to smoothly recover the communication of the movable site and ensure the smoothness of the communication, the application provides a cluster head unmanned aerial vehicle and two main unmanned aerial vehicles which fly to the upper air of the movable site and go to the deployment emergency communication system. Firstly, the safe networking among three unmanned aerial vehicles is completed, so that the communication range of the unmanned aerial vehicles is restored to cover the whole large-scale activity site. The control center completes the safe transmission of control signaling between the control center and the main unmanned aerial vehicle through the cluster head unmanned aerial vehicle. Then, the main unmanned aerial vehicle accesses to the nearby high-load base station and the remote low-load base station, and a large amount of user communication demands are shared to the remote base station, so that the workload of the nearby high-load base station is reduced, and finally, a reliable communication link is restored, so that an activity site can be communicated with the outside, and the wide spread of the activity is facilitated.

As shown in fig. 8: flood occurs in a certain area A, so that an island is formed in the area, the communication infrastructure is seriously damaged, communication signals in the area disappear, and emergency communication vehicles cannot enter in the first time. Disaster recovery personnel cannot be contacted with the outside, and disaster recovery personnel cannot accurately rescue the disaster, so that smooth expansion of various works such as disaster recovery after the disaster recovery is not facilitated. In order to recover the communication of the area in an emergency way, emergency rescue personnel can drive the emergency communication vehicle to reach the boundary of the disaster area and carry out the communication recovery work of the disaster area by constructing the space-to-day fusion network-oriented safety emergency communication method and system. First, the controllable range of the unmanned aerial vehicle is lifted by a lifting one-frame tethered unmanned aerial vehicle. Secondly, one cluster head unmanned aerial vehicle, two main unmanned aerial vehicles and four slave unmanned aerial vehicles fly to the upper air of the disaster area to finish the safe networking among the unmanned aerial vehicles and form a safe communication link among the unmanned aerial vehicles. The cluster head unmanned aerial vehicle is responsible for aggregating signaling sent by the main unmanned aerial vehicle to the control center so as to improve signaling transmission efficiency; the main unmanned plane is provided with a micro base station, so that local communication can be restored; the slave unmanned aerial vehicle is attached to the master unmanned aerial vehicle so as to enlarge the range of communication recovery. Then, in the flight process, the main unmanned aerial vehicle accesses to a base station which can normally work at a distance so as to improve the communication rate recovered by the system. In addition, under the condition of beyond-view distance, in order to ensure that the unmanned aerial vehicle receives the control signaling transmitted by the control center smoothly, the unmanned aerial vehicle and the control center carry out beyond-view distance transmission of the signaling by taking the Beidou satellite as a medium. So far, the deployment of the emergency communication system is completed, and the user can access the unmanned aerial vehicle to communicate with the outside. The unmanned aerial vehicle transfers the user data to a base station carried by the emergency communication vehicle or a remote base station, so that the user can get in touch with the outside.

As shown in fig. 9: in remote areas such as forests and mountain areas, due to poor local signals, when fire disasters or emergency situations such as personnel disconnection occur in the areas, communication is not smooth or communication is not easy to develop, work such as disaster relief and rescue is not easy to know the specific conditions of the disaster condition at the first time, the upper-level indication cannot be conveyed, and rescue work is not convenient to develop. In order to recover the communication link of the area as soon as possible, the application sends out one cluster head unmanned aerial vehicle and two main unmanned aerial vehicles to the deployment emergency communication system. Firstly, a control center transmits control signaling to an unmanned aerial vehicle through a Beidou satellite, the unmanned aerial vehicle carries out safe networking according to the fact that the unmanned aerial vehicle reaches the upper air of a corresponding area through command of the control center, and a checking result is returned to the control center through the Beidou satellite. The drone then forms a secure communication link. Then, rescue workers and disjunctor personnel can realize communication with the outside through accessing the unmanned aerial vehicle. The system smoothly provides reliable communication for the area, is beneficial to the efficient performance of rescue work and disaster relief work, further achieves the purpose of timely implementing emergency rescue, and reduces the loss caused by disaster.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Although the application is described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality.

The foregoing is a further detailed description of the application in connection with the preferred embodiments, and it is not intended that the application be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the application, and these should be considered to be within the scope of the application.

Claims (10)

1. The space-oriented converged network safety emergency communication method is characterized by comprising the following steps of:

the method comprises the steps that in the preparation stage, a control center selects a networking unmanned aerial vehicle from a plurality of unmanned aerial vehicles, and safety authentication and key negotiation between the networking unmanned aerial vehicle and the control center, between the networking unmanned aerial vehicle and between the networking unmanned aerial vehicle and a Beidou satellite are carried out; the networking unmanned aerial vehicle is divided into a cluster head unmanned aerial vehicle, a master unmanned aerial vehicle and a slave unmanned aerial vehicle; the cluster head unmanned aerial vehicle is responsible for forwarding control information of the control center to each unmanned aerial vehicle, the main unmanned aerial vehicle is responsible for recovering local communication, and the auxiliary unmanned aerial vehicle is used for expanding coverage;

in the cruising stage, the control center issues a cruising task to the networking unmanned aerial vehicle so that the networking unmanned aerial vehicle reaches a target area; the networking unmanned aerial vehicle perceives the distribution state of the user equipment in the target area and feeds back the distribution state to the control center, and the control center generates an unmanned aerial vehicle deployment scheme;

and in the networking stage, the control center issues the generated unmanned aerial vehicle deployment scheme to the networking unmanned aerial vehicle positioned in the target area, and the networking unmanned aerial vehicle completes networking work to form an emergency network.

2. The aerospace-oriented converged network security emergency communication method of claim 1, further comprising:

and in the maintenance stage, the control center issues a corresponding maintenance strategy to maintain the emergency network according to the current state of the emergency network.

3. The aerospace-oriented converged network security emergency communication method of claim 1, wherein the control center selects a networking unmanned aerial vehicle from a plurality of unmanned aerial vehicles, and performs security authentication and key negotiation between the networking unmanned aerial vehicle and the control center, between the networking unmanned aerial vehicle and the networking unmanned aerial vehicle, and between the networking unmanned aerial vehicle and a Beidou satellite, comprises:

the control center selects three types of networking unmanned aerial vehicles of a cluster head unmanned aerial vehicle, a master unmanned aerial vehicle and a slave unmanned aerial vehicle from a plurality of unmanned aerial vehicles;

performing security authentication and key negotiation between the cluster head unmanned aerial vehicle and the control center, between the main unmanned aerial vehicle and the control center and between the main unmanned aerial vehicle and the cluster head unmanned aerial vehicle according to a pre-agreed encryption mode;

and carrying out security authentication between the three types of networking unmanned aerial vehicle and the Beidou satellite according to the authentication mode of the unmanned aerial vehicle and the Beidou satellite.

4. The aerospace-oriented converged network security emergency communication method of claim 1, wherein the control center generating an unmanned aerial vehicle deployment scheme comprises:

and the control center generates an unmanned aerial vehicle deployment scheme according to the distribution condition of the user equipment and by utilizing a scheduling algorithm.

5. The aerospace-oriented converged network security emergency communication method of claim 1, wherein the control center issuing the generated unmanned aerial vehicle deployment scheme to the networking unmanned aerial vehicle located in the destination area, the networking unmanned aerial vehicle performing networking work to form an emergency network comprises:

judging whether the number of networking unmanned aerial vehicles positioned in the target area can meet the deployment scheme of the unmanned aerial vehicles or not;

if yes, the control center issues the generated unmanned aerial vehicle deployment scheme to the networking unmanned aerial vehicle located in the target area;

if not, the control center determines the number and types of the networking unmanned aerial vehicles to be supplemented according to the number of the networking unmanned aerial vehicles located in the target area and the unmanned aerial vehicle deployment scheme;

the control center dispatches the networking unmanned aerial vehicle to the corresponding position of the target area according to the quantity and the type of the networking unmanned aerial vehicles which are required to be supplemented, so that the dispatched networking unmanned aerial vehicle and the adjacent networking unmanned aerial vehicles finish safety authentication and networking work.

6. The aerospace-oriented converged network security emergency communication method of claim 2, wherein the control center issuing a corresponding maintenance policy to maintain the emergency network according to the current state of the emergency network comprises:

and the control center issues corresponding maintenance strategies to maintain the emergency network according to the three current states of the emergency network in group joining, unexpected offline and group updating.

7. The aerospace-oriented converged network security emergency communication method of claim 6, wherein the control center issuing a corresponding maintenance policy to maintain the emergency network according to whether the emergency network has a current state of group joining comprises:

the control center confirms that the emergency network is in the current state of group joining if monitoring that the networking unmanned aerial vehicle is overlarge in load due to simultaneous access of a large number of users and exceeds a load threshold value;

the control center dispatches a plurality of newly-supplemented unmanned aerial vehicles to reach the appointed place of the target area, the newly-supplemented unmanned aerial vehicles and the adjacent networking unmanned aerial vehicles are networked, and connection is established between the newly-supplemented unmanned aerial vehicles and the networking unmanned aerial vehicles exceeding a load threshold; after the networking unmanned aerial vehicle exceeding the load threshold finishes user data exchange, the plurality of newly-supplemented unmanned aerial vehicles perform user connection switching so as to establish data connection with user equipment.

8. The aerospace-oriented converged network security emergency communication method of claim 6, wherein the control center issuing a corresponding maintenance policy to maintain the emergency network according to whether the emergency network is in a current state of unexpected offline comprises:

if the cluster head unmanned aerial vehicle is offline accidentally, a main unmanned aerial vehicle connected with the cluster head unmanned aerial vehicle communicates with the control center through a Beidou satellite, and feeds back the current state that the emergency network is offline accidentally due to the offline of the cluster head unmanned aerial vehicle to the control center;

after receiving the current state that the cluster head unmanned aerial vehicle is offline and the emergency network is in unexpected offline, the control center sends a notification to other cluster head unmanned aerial vehicles located in a target area through Beidou satellites so as to inform the other unmanned aerial vehicles of the IDs of the standby cluster head unmanned aerial vehicles; dispatching the standby cluster head unmanned aerial vehicle to reach the appointed place of the target area, and carrying out security authentication and networking work with the main unmanned aerial vehicle;

if the non-cluster head unmanned aerial vehicle is offline accidentally, switching the networking unmanned aerial vehicle or user equipment connected with the non-cluster head unmanned aerial vehicle to an adjacent networking unmanned aerial vehicle;

if the control center monitors that the non-cluster head unmanned aerial vehicle is offline, confirming that an emergency network is in a current state of unexpected offline; and dispatching a new networking unmanned aerial vehicle to reach the appointed place of the target area, and carrying out security authentication and networking work with the adjacent networking unmanned aerial vehicle.

9. The aerospace-oriented converged network security emergency communication method of claim 6, wherein the control center issuing a corresponding maintenance policy to maintain the emergency network according to whether the emergency network has a current state of group update comprises:

when the control center monitors that the duration of a certain networking unmanned aerial vehicle reaches a maximum threshold, the control center automatically dispatches a new networking unmanned aerial vehicle to a designated place for work handover; and carrying out protocol exchange between the new networking unmanned aerial vehicle and the networking unmanned aerial vehicle with the duration reaching the maximum threshold value, replacing the networking unmanned aerial vehicle with the duration reaching the maximum threshold value to be integrated into an emergency network, and notifying the networking unmanned aerial vehicle with the duration reaching the maximum threshold value to return to the ground control center.

10. The aerospace integration network-oriented safety emergency communication system is characterized by comprising a control center and a plurality of unmanned aerial vehicles; the control center performs the following processes in combination with the unmanned aerial vehicle:

the method comprises the steps that in the preparation stage, a control center selects a networking unmanned aerial vehicle from a plurality of unmanned aerial vehicles, and safety authentication and key negotiation between the networking unmanned aerial vehicle and the control center, between the networking unmanned aerial vehicle and between the networking unmanned aerial vehicle and a Beidou satellite are carried out;

in the cruising stage, the control center issues a cruising task to the networking unmanned aerial vehicle so that the networking unmanned aerial vehicle reaches a target area; the networking unmanned aerial vehicle perceives the distribution state of the user equipment in the target area and feeds back the distribution state to the control center, and the control center generates an unmanned aerial vehicle deployment scheme;

and in the networking stage, the control center issues the generated unmanned aerial vehicle deployment scheme to the networking unmanned aerial vehicle positioned in the target area, and the networking unmanned aerial vehicle completes networking work to form an emergency network.