CN101908997B - Airport environment monitoring method based on wireless sensor network - Google Patents

Airport environment monitoring method based on wireless sensor network Download PDF

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Publication number
CN101908997B
CN101908997B CN2010102648330A CN201010264833A CN101908997B CN 101908997 B CN101908997 B CN 101908997B CN 2010102648330 A CN2010102648330 A CN 2010102648330A CN 201010264833 A CN201010264833 A CN 201010264833A CN 101908997 B CN101908997 B CN 101908997B
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China
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surveillance center
wireless sensor
network
sensor network
monitoring
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CN2010102648330A
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CN101908997A (en
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吴玉成
程焱芳
胡磊
刘阳
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重庆大学
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Abstract

The invention discloses an airport environment monitoring method based on a wireless sensor network, which realizes the real-time monitoring and early warning treatment through building up a wireless sensor network and a dedicated virtual network. The wireless sensor network comprises a network coordinator, a terminal unit and a monitoring node, and the dedicated virtual network comprises a monitoring center, a handheld device and a security system. The airport environment monitoring method is characterized in that the dedicated virtual network is utilized in the monitoring center to ensure the confidentiality and security of data information, the wireless sensor network can adopt different wireless channel access mechanisms under different conditions and can ensure that the monitoring node reports effective environment information to the monitoring center in real time in occurrence of emergencies, a GPRS (General Packet Radio Service) protocol is utilized between the wireless sensor network and the dedicated virtual network so as to enlarge the transmission distance of data, and the monitoring center can carry out the real-time judgment and early warning treatment to the loaded environment information so that an airport security system can be more intelligent and perfect, and accidents can be stopped accurately in real time.

Description

A kind of airport environment monitoring method based on wireless sensor network

Technical field

The present invention relates to wireless sensor network technology, specifically, is a kind of airport environment monitoring method based on wireless sensor network.

Background technology

Wireless sensor network WSN(wireless sensor network) be the network that forms by the self-organizing mode by sensor node with perception, processing and wireless communication ability.Compare with traditional cable network, WSN has characteristics such as placement is flexible, expansion is easy, in fields such as military affairs, medical treatment and environmental monitorings broad prospect of application is arranged.WSN medium access control protocol mainly solves a plurality of nodes sharing channel problems, and when the decision node reaches how to share the medium transceive data.Typically have based on the MAC agreement of not having conflict time division multiple access (TDMA) and carrier sense multiple (CSMA/CA) agreement that collision avoidance function is arranged, but they respectively have pluses and minuses in actual environment, specifically be applicable to different applied environments.

And along with the development of air-transport industry, the pressure that airport security faces is increasing, and concerning domestic most of airports, the airport site safety relies on simple artificial guard, cause the low of the generation of airport security accident and treatment effeciency easily, influence the normal operation of air transport system.

Chinese patent application 200910185418.3 discloses a kind of remote monitoring terminal unit that merges mutually based on WSN and GPRS network, though mentioned in this patent document with wireless sensor network WSN and wireless universal packet service network GPRS(General Packet Radio Service) merge mutually and realize remote monitoring, but this patent document is only described in detail the concrete structure of equipment, only emphasized that this equipment can realize the fusion of WSN and GPRS network, thereby satisfy the wireless transmission of teledata, may be used on long distance control system, but in this patent document and unexposed wireless sensor network to be applied in a certain concrete environment data be how to transmit and handle, the also intelligent decision of not mentioned Monitoring Data and safe early warning, also there is certain degree of difficulty in the intellectual monitoring that wants to utilize the disclosed content of this patent document to realize airport environment.

The shortcoming of prior art is: artificial guard is adopted in existing airport environment monitoring mostly, consumes the manpower financial capacity, and intelligent degree is low, and the security protection leak is serious, causes the airport security accident easily.Though present wireless sensor network technology comparative maturity, but it is also relatively more rare specifically to be applied in this large-scale safety inspection of airport environment, monitor for airport environment, also there are many technical barriers in the transmission of data and processing in the layout of sensor network and the network, want to guarantee the real-time reliable transmission and the airport environment safety whether intelligent decision of airport environment Monitoring Data, or even be in airport environment and can make corresponding safety precaution action under the threatened status and all also have certain technological deficiency.

Summary of the invention

At the deficiencies in the prior art, the purpose of this invention is to provide a kind of airport environment monitoring method based on wireless sensor network, this method is to wish to have now ripe wireless sensor network technology to be applied to concrete airport environment monitoring, gather the airport environmental information in real time by the sensor node in the wireless sensor network, should guarantee the true reliable transmission of data, can judge airport environment again and whether be in a safe condition, also will make corresponding safety precaution action simultaneously according to the safe condition of airport environment.

For achieving the above object, the present invention proposes a kind of airport environment monitoring method based on wireless sensor network, its key is to carry out according to following steps:

The 1st step: build a wireless sensor network WSN, described wireless sensor network WSN is made up of a network coordinator, a N terminal equipment and M monitoring node, described N and M are the integer more than or equal to 1, a described M monitoring node is arranged in the airport environment, be used to gather the airport environmental information, described terminal equipment is used for obtaining the environmental information that described monitoring node gathers and this environmental information is uploaded to described network coordinator;

A described M monitoring node is distributed in around the airport at random in a large number, according to the energy-conservation and requirement network service real-time, arrange evenly that by artificial a large amount of terminal equipments is around monitoring node, it here is N, guarantee that monitoring node arrives described terminal equipment in 1 to 2 jumping communication distance, each terminal equipment can connect a plurality of monitoring joints or other-end equipment, can communicate by letter between the monitoring node, also can communicate by letter between the terminal equipment, terminal equipment is responsible for collecting the environmental information that described monitoring node is gathered, and set up the multi-hop backbone route, the environmental information of collecting is sent in the described network coordinator by backbone route, makes that the data that any one monitoring node detected among the described wireless sensor network WSN all can be by directly uploading or the mode of routing forwarding is sent in the described network coordinator in real time.

The 2nd step: build a VPN (virtual private network) VPN(Virtual Private Network), described virtual specialized network VPN is made of Surveillance center, safety-protection system and at least one handheld device, be provided with GPRS GPRS module on described Surveillance center, safety-protection system and any one handheld device, on the described GPRS module APN access card is installed, this APN access card is used to realize the real-time Data Transmission between described Surveillance center, safety-protection system and any one handheld device;

The 3rd step: described network coordinator is broadcasted first kind of mac layer frame form MAC1 according to the acquiescence mode in described wireless sensor network WSN, terminal equipment in the described wireless sensor network WSN is or/and after monitoring node receives described first kind of mac layer frame form MAC1, upload described environmental information according to time division multiple access TDMA wireless channel access way and give described network coordinator, described network coordinator encapsulates framing with the GPRS agreement with the environment letter that is obtained, and sends the GPRS Frame that is packaged into to described Surveillance center at last;

The 4th step: described Surveillance center receives and stores the GPRS Frame that described network coordinator is uploaded, resolve and obtain the effective environment value of information in the described GPRS Frame, the default Event triggered value and the described effective environment value of information of calling system compares, and judges whether safety of airport environment;

The effective environment value of information that receives when described Surveillance center is during less than the Event triggered value of described systemic presupposition, and Surveillance center judges that airport environment is in a safe condition, otherwise, judge that airport environment is in to suffer threatened status;

The 5th step: when described Surveillance center determines airport environment when being in a safe condition, return described the 4th step, described Surveillance center continues the GPRS Frame that described network coordinator is uploaded is handled and judged;

Be in when suffering threatened status when described Surveillance center determines airport environment, this Surveillance center is further according to threatening scene to judge that airport environment is in alert status or is in the emergency alarm state;

If airport environment is in alert status, described Surveillance center sends second control messages to described network coordinator, when described network coordinator receives second control messages of described Surveillance center transmission, this network coordinator is broadcasted second kind of mac layer frame form MAC2 in described wireless sensor network WSN, after terminal equipment in the described wireless sensor network WSN and monitoring node receive described second kind of mac layer frame form MAC2, avoid the CSMA/CA wireless channel to mix access way according to time division multiple access TDMA and carrier sense conflict and upload described environmental information to described network coordinator;

When if airport environment is in the emergency alarm state, described Surveillance center sends the 3rd control messages to described network coordinator, when described network coordinator receives the 3rd control messages of described Surveillance center transmission, this network coordinator is broadcasted the third mac layer frame form MAC3 in described wireless sensor network WSN, after terminal equipment in the described wireless sensor network WSN and monitoring node receive described the third mac layer frame form MAC3, avoid CSMA/CA wireless channel access way to upload described environmental information according to the carrier sense conflict and give described network coordinator;

The 6th step: when airport environment was in alert status or emergency alarm state, described Surveillance center controls described handheld device and/or described safety-protection system is taked the safety precaution action.

Adopt the GPRS technology to carry out transfer of data in the described VPN network, the real-time and the fail safe of data information transfer have been guaranteed, Surveillance center in the VPN network can store and handle the data that the network coordination is uploaded on the one hand, Surveillance center can also carry out intelligent decision to the data of accepting on the other hand, determine whether safety of airport environment, control described handheld device and safety-protection system simultaneously and take corresponding safety precaution action.

Network coordinator uploads to Surveillance center with grouped data, the packet that Surveillance center's storage receives.The default Event triggered value of calling system and the packet of reception compare then, judge whether safety of airport environment.If airport environment is in a safe condition, WSN adopts the TDMA wireless channel access way of acquiescence periodically to upload perception data and gives network coordinator.If the airport is in and suffers threatened status, then alert status or the emergency alarm state of being in judged by Surveillance center, issues different MAC control messages according to different conditions and gives network coordinator.Network coordinator is resolved control messages, and broadcasts new wireless channel access mechanism according to the requirement of Surveillance center in WSN.At alert status, wireless sensor network adopts the wireless channel of TDMA and CSMA/CA to mix access way and uploads perception data; At the emergency alarm state, WSN adopts the wireless channel access way of CSMA/CA to upload perception data.

Described wireless sensor network WSN adopts the mesh network topologies structure, and there are a communication link between any two at least in described network coordinator, any one terminal equipment and any one monitoring node;

If the communication distance of described monitoring node and described network coordinator is in 1 jumping scope, described monitoring node directly transmits environmental monitoring data to described network coordinator;

If the communication distance of described monitoring node and described network coordinator is beyond 1 jumping scope, described monitoring node is transmitted described environmental monitoring data by other monitoring node or terminal equipment;

Described terminal equipment is used for making up the backbone route link of described wireless sensor network WSN, also is used to receive the environmental monitoring data that described monitoring node is uploaded, and these data are forwarded in the described network coordinator by described backbone route link.

Communication link between each network node among the wireless sensor network WMN adopts and dynamically sets up the also mode of real-time servicing, communication in the network can be owing to the inefficacy of some routing node is interrupted, each monitoring node can communicate with terminal equipment or network coordinator in 1 to 2 jumps, and has lower time delay.And terminal equipment can connect 254 slave units at most, described slave unit is monitoring node or the other-end equipment that this terminal equipment 1 is jumped in the communication distance scope, slave unit also can be the network coordinator on this terminal equipment upper strata, described terminal equipment is responsible for collecting the data message of monitoring node, and set up the backbone route link of multi-hop, the data message of collecting is sent in the described network coordinator by the backbone route link, to guarantee the data in real time transmission in the whole network.

Described monitoring node manually is arranged in the airport environment that needs monitoring, that its arrangement is divided into is buried, ground is distributed and distributed in midair, at least a sensor assembly of the inner employing of described monitoring node, described sensor assembly is one or more combinations in temperature/humidity sensor, pressure sensor, speed/displacement/height sensor, image/sensor noise, wind direction/air velocity transducer and the pernicious gas/dust sensor.

Monitoring node is according to the different transducer of content choice of varying environment needs monitorings, such as in order to monitor whether personnel's illegal invasion is arranged, can installation diagram picture/noise transducer, and in order to monitor the situation of change of airport weather, temperature/humidity sensor can be installed.

Described terminal equipment is used to realize the data routing function of described wireless sensor network WSN, also is used to realize the positioning function and the warning function of terminal equipment, and described warning function is divided into audio alert and light warning.

Positioning function by terminal equipment, Surveillance center is easy to judge the geographical position that the threat incident takes place in the airport environment, be convenient to take corresponding security measure, warning function then is can send alarm when airport environment is in threatened status, and reminds people is taken care or emergency evacuation such as carrying by audio alert or light warning.

Described Surveillance center is provided with the prediction graphics module, when determining the airport surrounding enviroment, Surveillance center is in when suffering threatened status, { t-△ t calls in described Surveillance center, the effective environment value of information of being stored in the t} time period threatens the development trend of things and draws out the action indicator diagram by described prediction graphics module analysis;

Described Surveillance center sends to described handheld device with described action indicator diagram, is used to point out the Field Security Personnel to carry out safety inspection;

Described Surveillance center also sends to described safety-protection system with described action indicator diagram, is used to point out safety-protection system to take the safety precaution action.

Just because of described terminal equipment has positioning function, comprised the geographical position that produces these data in the data of uploading by this terminal equipment, when receiving these data, described Surveillance center can recognize the environmental aspect in this geographical position, Surveillance center passes through { t-△ t, information in the t} time period is analyzed, promptly know the variation tendency of airport environment in a period of time before this moment △ t, can draw out corresponding action indicator diagram by described prediction graphics module, Surveillance center's indicator diagram of will taking action sends in handheld device or the safety-protection system, can point out the security protection personnel to take the safety precaution action.

Compared with prior art, the invention has the beneficial effects as follows:

At first, Surveillance center adopts the VPN private network, is beneficial to the confidentiality and the fail safe of data message;

Secondly, wireless sensor network WSN adopts different wireless channel access mechanisms under different situations, can guarantee monitoring node in case of emergency real-time to Surveillance center's report effective environmental information;

Once more, network coordinator among the wireless sensor network WSN adopts GPRS communication protocol and VPN virtual private network (VPN) communication, make the data message of WSN network realize remote the transmission, transmission performance is more stable simultaneously, is convenient to Surveillance center the airport surrounding enviroment are realized remote monitoring;

At last, Surveillance center can carry out real-time judge and early warning processing to the airport environment information that wireless sensor network WSN uploads, and has strengthened the intelligent and integrity of airport security protection system, can effectively reduce the airport security accident rate.

Description of drawings

Fig. 1 is the network configuration topological diagram among the present invention;

Fig. 2 is the functional block diagram of Surveillance center among Fig. 1;

Fig. 3 is the functional block diagram of network coordinator among Fig. 1;

Fig. 4 is the functional block diagram of terminal equipment among Fig. 1;

Fig. 5 is the functional block diagram of monitoring node among Fig. 1;

Fig. 6 is first kind of mac layer frame form MAC1 described in the present invention;

Fig. 7 is second kind of mac layer frame form MAC2 described in the present invention;

Fig. 8 is the third mac layer frame form MAC3 described in the present invention;

Fig. 9 is the control flow chart of Surveillance center among Fig. 1;

Figure 10 is the control flow chart that network coordinator is changed the channel access mechanism among Fig. 1.

Embodiment

Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention and operation principle thereof are described in detail.

The present invention proposes a kind of airport environment monitoring method based on wireless sensor network, and its key step is as follows:

The 1st step: build a wireless sensor network WSN, described wireless sensor network WSN is made up of a network coordinator, a N terminal equipment and M monitoring node, described N and M are the integer more than or equal to 1, a described M monitoring node is arranged in the airport environment, be used to gather the airport environmental information, described terminal equipment is used for obtaining the environmental information that described monitoring node gathers and this environmental information is uploaded to described network coordinator;

As shown in Figure 1, monitoring node is 7 among the figure, and terminal equipment is 4, and here just schematically, the number of monitoring node and terminal equipment can be set according to the range size of airport environment and the specifying information of required monitoring.Described wireless sensor network WSN adopts the mesh network topologies structure, and there are a communication link between any two at least in described network coordinator, any one terminal equipment and any one monitoring node;

If the communication distance of described monitoring node and described network coordinator is in 1 jumping scope, described monitoring node directly transmits environmental monitoring data to described network coordinator;

If the communication distance of described monitoring node and described network coordinator is beyond 1 jumping scope, described monitoring node is transmitted described environmental monitoring data by other monitoring node or terminal equipment;

Described terminal equipment is used for making up the backbone route link of described wireless sensor network WSN, also is used to receive the environmental monitoring data that described monitoring node is uploaded, and these data are forwarded in the described network coordinator by described backbone route link.

The 2nd step: build a VPN (virtual private network) VPN, described VPN (virtual private network) VPN is made of Surveillance center, safety-protection system and at least one handheld device, be provided with GPRS GPRS module on described Surveillance center, safety-protection system and any one handheld device, on the described GPRS module APN access card is installed, this APN access card is used to realize the real-time Data Transmission between described Surveillance center, safety-protection system and any one handheld device;

The inside of Surveillance center, handheld device and safety-protection system all is equipped with the GPRS module, apply for vpn service by the airport to China Mobile, for the GPRS module of Surveillance center, handheld device and safety-protection system is installed the APN card, thereby can constitute a VPN private network to Surveillance center, plural handheld device and safety-protection system.Like this, can mutual communication between Surveillance center and handheld device, Surveillance center and terminal equipment and handheld device and the terminal equipment, guaranteed the real-time and the fail safe of data information transfer.Utilize the form of this VPN private network, handheld device not only can be communicated by letter with Surveillance center, can also carry out real-time communicating by letter with safety-protection system, more helps in time safeguarding under critical environment the safety on airport.Simultaneously, the VPN private network helps the confidentiality of transfer of data, relatively is fit to the requirement in this high secure environment place, airport.Simultaneously, in case the VPN private network breaks down, safeguard also very convenient.

Arrive shown in Figure 5 as Fig. 2, described Surveillance center, network coordinator, terminal equipment and monitoring node are provided with a microprocessor that is used to carry out data processing and control, be connected with the judge module of trigger event on the microprocessor of wherein said Surveillance center, power module, GPRS wireless communication module and prediction graphics module, be connected with wireless radio-frequency communication module on the microprocessor of described network coordinator, power module and GPRS wireless communication module, be connected with wireless radio-frequency communication module on the microprocessor of described terminal equipment, power module and illumination module, the module of blowing a whistle, the microprocessor of described monitoring node is connected with wireless radio-frequency communication module, power module, sensor assembly, network coordinator, wireless radio-frequency communication module on terminal equipment and the monitoring node is used to be implemented in the radio communication in the wireless sensor network WSN, the working frequency range of wireless radio-frequency communication module adopts 2.4GHz, and the GPRS module on the network coordinator this be used to realize and remote monitoring center between carry out real-time transfer of data.

Described monitoring node manually is arranged in the airport environment that needs monitoring, the position of arranging can picked at random, that its arrangement is divided into is buried, ground is distributed and distributed in midair, at least a sensor assembly of the inner employing of described monitoring node, described sensor assembly is divided into temperature/humidity sensor, pressure sensor, speed/displacement/height sensor, image/sensor noise, wind direction/air velocity transducer and pernicious gas/dust sensor, and choosing according to concrete monitoring of environmental of transducer requires to determine.

Described terminal equipment is used to realize the data routing function of described wireless sensor network WSN, also is used to realize the positioning function and the warning function of terminal equipment, can realize light warning and audio alert by the illumination module and the module of blowing a whistle.

Described Surveillance center is provided with the judge module and the prediction graphics module of trigger event, the data that wireless sensor network WSN can be uploaded are carried out incident and are judged, whether determine airport environment is in a safe condition, if airport environment is threatened, then can depict the development trend of threat incident by the prediction graphics module.

The 3rd step: described network coordinator is broadcasted first kind of mac layer frame form MAC1 according to the acquiescence mode in described wireless sensor network WSN, after terminal equipment in the described wireless sensor network WSN and monitoring node receive described first kind of mac layer frame form MAC1, upload described environmental information according to time division multiple access TDMA wireless channel access way and give described network coordinator, described network coordinator encapsulates framing according to the GPRS agreement with the environment letter that is obtained, and sends the GPRS Frame that is packaged into to described Surveillance center at last.

Described network coordinator is responsible for receiving, all data-messages in the fusing wireless sensing device network WSN, upload to described Surveillance center by the GPRS module according to GPRS communication protocol then, realized the communication between wireless sensor network WSN and the professional virtual network VPN.

The 4th step: described Surveillance center receives and stores the GPRS Frame that described network coordinator is uploaded, resolve and obtain the effective environment value of information in the described GPRS Frame, the default Event triggered value and the described effective environment value of information of calling system compares, and judges whether safety of airport environment;

The effective environment value of information that receives when described Surveillance center is during less than the Event triggered value of described systemic presupposition, and Surveillance center judges that airport environment is in a safe condition, otherwise, judge that airport environment is in to suffer threatened status;

The 5th step: when described Surveillance center determines airport environment when being in a safe condition, return described the 4th step, the access mechanism of MAC layer does not change between interior each node of wireless sensor network WSN, and the GPRS Frame that the continuation of described Surveillance center is uploaded described network coordinator is handled and judged;

Be in when suffering threatened status when described Surveillance center determines airport environment, this Surveillance center is further according to threatening scene to judge that airport environment is in alert status or is in the emergency alarm state;

Usually scope belongs to safe range beyond 10 meters on the regulation airport periphery, and scope belongs to early warning range in 10 meters on the airport periphery, and the airport scope is with the interior emergency alarm scope that belongs to.

If the scene that threatens incident is in the scope in 10 meters on the airport periphery, then Surveillance center determines airport environment and is in alert status, described Surveillance center sends second control messages to described network coordinator, when described network coordinator receives second control messages of described Surveillance center transmission, this network coordinator is broadcasted second kind of mac layer frame form MAC2 in described wireless sensor network WSN, after terminal equipment in the described wireless sensor network WSN and monitoring node receive described second kind of mac layer frame form MAC2, avoid the CSMA/CA wireless channel to mix access way according to time division multiple access TDMA and carrier sense conflict and upload described environmental information to described network coordinator;

If the scene of the incident of threat is in the scope of airport, then Surveillance center determines airport environment and is in the emergency alarm state, described Surveillance center sends the 3rd control messages to described network coordinator, when described network coordinator receives the 3rd control messages of described Surveillance center transmission, this network coordinator is broadcasted the third mac layer frame form MAC3 in described wireless sensor network WSN, after terminal equipment in the described wireless sensor network WSN and monitoring node receive described the third mac layer frame form MAC3, avoid CSMA/CA wireless channel access way to upload described environmental information according to the carrier sense conflict and give described network coordinator;

Described first kind of mac layer frame form MAC1 as shown in Figure 6, be that wireless sensor network WSN adopts the MAC1 access mechanism, network coordinator among the wireless sensor network WSN is divided into T1 to Tn little time slot with each frame according to the form of TDMA, and distribute a time slot for each child node of each interior father node of WSN network and each father node correspondence, each child node sends data-message to the father node of oneself in the time slot of oneself.

Described second kind of mac layer frame form MAC2 as shown in Figure 7, be that wireless sensor network WSN adopts the MAC2 access mechanism, network coordinator in the wireless sensor network WSN is divided into two parts with the time slot of each frame: the first half time slot is divided into T1 to Tn little time slot according to the form of TDMA, and the time slot average mark that these are little gives each father node in the WSN and each child node of each father node correspondence, and each child node uploads data on the father node of oneself at the time slot of oneself.Remaining that part of time slot adopts the form of CSMA/CA to distribute to the successful node of competition, have only when a certain child node has bursty data just can send challenge message, have the node of burst transfers of data in the time slot that competition obtains, can send bursty data like this to father node.

Described the third mac layer frame form MAC3 as shown in Figure 8, be that wireless sensor network WSN adopts the MAC3 access mechanism, this moment, Surveillance center needed more in good time grasp to threaten the development trend of things, wireless sensor network WSN mainly is responsible for uploading bursty data, so all nodes in the wireless sensor network WSN are all with the mode access channel of CSMA/CA, and in the time slot of competition gained, upload data-message.

Described child node can be the monitoring node in the wireless sensor network WSN, also can be the terminal equipment that is used for data forwarding, and described father node can be a network coordinator, also can be the terminal equipment in the backbone route link.

How the concrete control flow of described Surveillance center and network coordinator change the channel access mechanism can be by Fig. 9 and the further detail knowledge of Figure 10.

The 6th step: when airport environment was in alert status or emergency alarm state, described Surveillance center controls described handheld device and/or described safety-protection system is taked the safety precaution action.

Described monitoring center is provided with the prediction graphics module, when determining airport environment, Surveillance center is in when suffering threatened status, { t-△ t calls in described Surveillance center, the effective environment value of information of being stored in the t} time period threatens the development trend of things and draws out the action indicator diagram by described prediction graphics module analysis;

Described Surveillance center sends to described handheld device with described action indicator diagram, can point out the Field Security Personnel to carry out safety inspection;

Described Surveillance center also sends to described safety-protection system with described action indicator diagram, can point out safety-protection system to take the safety precaution action.

Usually Surveillance center extract effective environmental information p, t, u}, wherein p is a positional information, t is the time of reception information, u be the environmental information of correspondence.Surveillance center preserves current time t and reaches the data message of △ t scope before, call inner state of affairs prediction module, according to t-△ t, t} effective information during this period of time carries out state of affairs trend analysis, analyzes content to be: the △ t threat objects direction of motion and speed during this period of time; The form of threat objects, destruction dynamics and in the time { zone that threat objects may arrive in the t, t+ △ t}; Threaten things may adopt what resistance measure; Current what weaponry that should adopt is prevented the threat things, whether needs to increase the accent security personnel.In VPN private network inside, handheld device and safety-protection system are handed down to according to analysis result drafting action indicator diagram in Surveillance center, the Field Security Personnel is according to the action indicator diagram that receives, rush for in-situ processing and threaten incident, safety-protection system also takes the circumstances into consideration to increase the security protection weapon of transferring security personnel or preparation to need simultaneously, and the intelligent monitoring and the real-time and effective accident that finally reach airport environment are handled.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (5)

1. airport environment monitoring method based on wireless sensor network is characterized in that carrying out according to following steps:
The 1st step: build a wireless sensor network WSN, described wireless sensor network WSN is made up of a network coordinator, a N terminal equipment and M monitoring node, described N and M are the integer more than or equal to 1, a described M monitoring node is arranged in the airport environment, be used to gather the airport environmental information, described terminal equipment is used for obtaining the environmental information that described monitoring node gathers and this environmental information is uploaded to described network coordinator;
The 2nd step: build a VPN (virtual private network) VPN, described VPN (virtual private network) VPN is made of Surveillance center, safety-protection system and at least one handheld device, be provided with GPRS GPRS module on described Surveillance center, safety-protection system and any one handheld device, on the described GPRS module APN access card is installed, this APN access card is used to realize the real-time Data Transmission between described Surveillance center, safety-protection system and any one handheld device;
The 3rd step: described network coordinator is broadcasted first kind of mac layer frame form MAC1 according to the acquiescence mode in described wireless sensor network WSN, after terminal equipment in the described wireless sensor network WSN and monitoring node receive described first kind of mac layer frame form MAC1, upload described environmental information according to time division multiple access TDMA wireless channel access way and give described network coordinator, described network coordinator encapsulates framing according to the GPRS agreement with the environment letter that is obtained, and sends the GPRS Frame that is packaged into to described Surveillance center at last;
The 4th step: described Surveillance center receives and stores the GPRS Frame that described network coordinator is uploaded, resolve and obtain the effective environment value of information in the described GPRS Frame, the default Event triggered value and the described effective environment value of information of calling system compares, and judges whether safety of airport environment;
The effective environment value of information that receives when described Surveillance center is during less than the Event triggered value of described systemic presupposition, and Surveillance center judges that airport environment is in a safe condition, otherwise, judge that airport environment is in to suffer threatened status;
The 5th step: when described Surveillance center determines airport environment when being in a safe condition, return described the 4th step, described Surveillance center continues the GPRS Frame that described network coordinator is uploaded is handled and judged;
Be in when suffering threatened status when described Surveillance center determines airport environment, this Surveillance center is further according to threatening scene to judge that airport environment is in alert status or is in the emergency alarm state;
If airport environment is in alert status, described Surveillance center sends second control messages to described network coordinator, when described network coordinator receives second control messages of described Surveillance center transmission, this network coordinator is broadcasted second kind of mac layer frame form MAC2 in described wireless sensor network WSN, after terminal equipment in the described wireless sensor network WSN and monitoring node receive described second kind of mac layer frame form MAC2, avoid the CSMA/CA wireless channel to mix access way according to time division multiple access TDMA and carrier sense conflict and upload described environmental information to described network coordinator;
When if airport environment is in the emergency alarm state, described Surveillance center sends the 3rd control messages to described network coordinator, when described network coordinator receives the 3rd control messages of described Surveillance center transmission, this network coordinator is broadcasted the third mac layer frame form MAC3 in described wireless sensor network WSN, terminal equipment in the described wireless sensor network WSN is or/and after monitoring node receives described the third mac layer frame form MAC3, avoid CSMA/CA wireless channel access way to upload described environmental information according to the carrier sense conflict and give described network coordinator;
The 6th step: when airport environment was in alert status or emergency alarm state, described Surveillance center controls described handheld device and/or described safety-protection system is taked the safety precaution action.
2. a kind of airport environment monitoring method according to claim 1 based on wireless sensor network, it is characterized in that: described wireless sensor network WSN adopts the mesh network topologies structure, and there are a communication link between any two at least in described network coordinator, any one terminal equipment and any one monitoring node;
If the communication distance of described monitoring node and described network coordinator is in 1 jumping scope, described monitoring node directly transmits environmental monitoring data to described network coordinator;
If the communication distance of described monitoring node and described network coordinator is beyond 1 jumping scope, described monitoring node is transmitted described environmental monitoring data by other monitoring node or terminal equipment;
Described terminal equipment is used for making up the backbone route link of described wireless sensor network WSN, also is used to receive the environmental monitoring data that described monitoring node is uploaded, and these data are forwarded in the described network coordinator by described backbone route link.
3. a kind of airport environment monitoring method according to claim 1 based on wireless sensor network, it is characterized in that: described monitoring node manually is arranged in the airport environment of needs monitoring, that its arrangement is divided into is buried, ground is distributed and distributed in midair, at least a sensor assembly of the inner employing of described monitoring node, described sensor assembly is one or more combinations in temperature/humidity sensor, pressure sensor, speed/displacement/height sensor, image/sensor noise, wind direction/air velocity transducer or the pernicious gas/dust sensor.
4. a kind of airport environment monitoring method according to claim 1 based on wireless sensor network, it is characterized in that: described terminal equipment is used to realize the data routing function of described wireless sensor network WSN, also be used to realize the positioning function and the warning function of terminal equipment, described warning function is divided into audio alert and light warning.
5. a kind of airport environment monitoring method according to claim 4 based on wireless sensor network, it is characterized in that: described Surveillance center is provided with the prediction graphics module, when determining airport environment, Surveillance center is in when suffering threatened status, { t-△ t calls in described Surveillance center, the effective environment value of information of being stored in the t} time period threatens the development trend of things and draws out the action indicator diagram by described prediction graphics module analysis;
Described Surveillance center sends to described handheld device with described action indicator diagram, is used to point out the Field Security Personnel to carry out safety inspection;
Described Surveillance center also sends to described safety-protection system with described action indicator diagram, is used to point out safety-protection system to take the safety precaution action.
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