CN111615095B - Crowd interaction situation awareness method and system for primary and secondary schools - Google Patents
Crowd interaction situation awareness method and system for primary and secondary schools Download PDFInfo
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- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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Abstract
The invention relates to the technical field of crowd interaction situation awareness, and provides a crowd interaction situation awareness method and system for primary and secondary schools, wherein the method comprises the following steps: s1: establishing a first frequency point for communication between the wearable terminals and a second frequency point for communication between the wearable terminals and the area reader-writer; s2: the wearable terminal acquires the number N of people in the current area from the area reader-writer; s3: the wearable terminal broadcasts short packets to other wearable terminals in the area and receives the short packets broadcast by the other wearable terminals; s4: the wearable terminal sends the long package to an area reader-writer; s5: the regional reader-writer analyzes the number of people in the current moment of the current region according to the long packet, and updates the number of people N; s6: and uploading the regional situation data packet to a school comprehensive management platform by the regional reader-writer, and constructing a crowd interaction situation perception model for primary and secondary schools. The method solves the problems that the existing method is poor in positioning precision, high in cost and not suitable for school scenes.
Description
Technical Field
The invention relates to the technical field of crowd interaction situation awareness, in particular to a crowd interaction situation awareness method and system for primary and secondary schools.
Background
The personnel interaction situation can be realized in principle by accurate positioning, i.e. if the position information of two students basically coincide, the interaction situation of two persons can be considered to occur. Currently, there are two main types of area (indoor) positioning technologies:
1. indoor positioning technology based on external confidence source
The implementation of the technology depends on an external information source, and mainly comprises Ultra Wide Band (UWB), wiFi, bluetooth and the like.
(1)UWB
The UWB positioning technology is used for transmitting the pulse signal power spectrum density of the data is extremely low, and the pulse width is extremely narrow, so that the UWB positioning technology has the characteristics of high time resolution, strong space penetrating power and the like, and can obtain the distance measurement and positioning precision which are superior to centimeter level under the line of sight (LOS) environment. In the present case, UWB devices are expensive and relatively expensive to deploy.
(2)WiFi
The method mainly comprises a distance measurement intersection method and a fingerprint matching method. The method comprises the steps of converting the signal attenuation intensity of a WiFi signal from an access point to a receiver into a distance between the two signals by using a signal intensity attenuation model, and estimating the position of the receiver according to the distance constraint between more than three access points and the receiver by adopting a triangulation method. The method has the advantages that a maintenance data fingerprint database is not required to be established, and the positioning precision is higher than the precision of the fingerprint database; the method has the defects that the signal intensity attenuation model is strongly related to the indoor environment, and the accurate signal intensity attenuation model is difficult to obtain because the indoor environment is complex and changeable and the non-line-of-sight phenomenon is serious. The fingerprint matching method is to establish a mapping relation between position information which is difficult to directly measure and signal characteristics (such as wireless signal strength) which are easy to acquire, namely, establish exclusive signal characteristic fingerprints corresponding to the position coordinates of each indoor scene, so as to match and estimate the spatial position of a target to be measured. The method has the advantages that the channel attenuation model does not need to be solved, and the method has the disadvantage that a great deal of manpower is consumed in constructing the fingerprint library.
(3) Bluetooth (R)
The Bluetooth positioning is divided into a distance measurement intersection method and a fingerprint matching method, which are the same as the WiFi positioning principle. Most of the intelligent mobile phone terminals are provided with Bluetooth modules, so that the intelligent mobile phone terminals are convenient to popularize in a large range and deploy field equipment; however, the positioning technology based on bluetooth is easy to be interfered by external noise signals, has poor signal stability and has a small communication range. The most commonly used Bluetooth positioning technology is a Bluetooth 4.0-based low-power Bluetooth technology, and the technology has the characteristics of low power consumption, higher connection speed, high transmission rate, stable, safe and interference-free signal transmission and the like. However, bluetooth beacons are required to be deployed in high density, and the software cost is high, so that the cost is high. Often in combination with WiFi to achieve small area enhancements for indoor positioning.
2. Indoor positioning technology based on natural information source
The technology can realize positioning by only relying on a sensor of the terminal, and comprises inertial navigation, geomagnetic navigation and the like. Along with the continuous progress of indoor positioning technology, positioning accuracy is gradually improved to the level of meters and even sub-meters, and the consumer market level is started.
In view of the current state of the positioning technology, the positioning accuracy is deviated, the cost is high, or the method is not applicable to school scenes (mobile phones are not allowed to be carried, and the like), and the problem of personnel interaction situation perception in campus scenes is solved by applying the area positioning technology.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a crowd interaction situation awareness method and system for middle and primary schools, which are researched by adopting a short-distance wireless communication technology and a final situation model is obtained. The method has the advantages of high positioning accuracy and low cost, and is particularly suitable for school scenes.
The above object of the present invention is achieved by the following technical solutions:
a crowd interaction situation awareness method for primary and secondary schools comprises the following steps:
s1: establishing a wearable terminal provided for students in middle and primary schools to wear, establishing a first frequency point for the wearable terminal to communicate with each other, and establishing a second frequency point for the wearable terminal to communicate with an area reader-writer, wherein the area reader-writer is equipment which is arranged in each area and performs data interaction with the wearable terminal;
s2: the wearable terminal acquires the number N of people in the current area from the area reader-writer by using the second frequency point;
s3: the wearable terminal switches to a first frequency point, monitors a current wireless channel, broadcasts and sends short packets to other wearable terminals in an area when the channel is idle, and receives records and analyzes the short packets broadcasted by the other wearable terminals in the area after the short packets are sent;
S4: the wearable terminal packs the information comprising the ID of the terminal, the short packet broadcasted by the wearable terminal in the recorded area and the current time stamp into a long packet, and sends the second frequency to the area reader;
s5: the regional reader-writer analyzes and calculates the number of people in the current moment of the current region according to the long packet in a period of time, updates the number N of people in the current region, and jumps to S2;
s6: and the regional reader-writer packages the data comprising the long package and the position information into a regional situation data package, uploads the regional situation data package to a school comprehensive management platform, and combines a school three-dimensional simulation map to construct a crowd interaction situation perception model oriented to middle and primary schools.
Further, in step S3, the current wireless channel is monitored, and when the channel is idle, short packets are broadcast and sent to other wearable terminals in the area, specifically:
monitoring a current radio channel, when the channel is busy, at [1, N]Starting a dormancy timer to enable the wearable terminal to enter a dormancy waiting mode, wherein the timing duration of the dormancy timer is as follows: t (T) TX When the dormancy timer is finished, continuing to monitor the current wireless channel until the channel is idle, wherein the unit time length is the unit time length for the wearable terminal to broadcast the short message The duration of the packet;
and when the channel is idle, broadcasting and transmitting the short packet to other wearable terminals in the area by using the first frequency point.
Further, in step S3, after the short packet is sent, the method further includes receiving the short packet broadcast by the other wearable terminals in the recording and parsing area, and further includes:
starting the short packets broadcast by other wearable terminals in a receiving area of a receiving timer, wherein the timing duration of the receiving timer is set as T RX Time length of =n x unit.
Further, the specific format of the short packet is as follows: type code + ID of the wearable terminal + sum check code;
the type code is the model of the wearable terminal, and the accuracy of the transmission data in the short packet is verified through the summation check code.
Further, the specific format of the long packet is as follows: the ID of the wearable terminal, the ID of the area reader-writer, the current timestamp, the collection of all IDs of the wearable terminal in the area obtained through analysis and the CRC check code.
Further, the specific format of the area situation data packet is as follows: and the set of all received long packets sent by the wearable terminal is plus the position information of the area reader-writer.
A crowd interaction situational awareness system for primary and secondary schools, comprising: the system comprises a communication basic equipment building module, an area personnel number acquisition module, a short packet sending and receiving module, a long packet sending module, an area personnel number updating module and an interactive situation perception model building module;
the communication basic equipment establishing module is used for establishing a wearable terminal provided for students in middle and primary schools to wear, establishing a first frequency point for the wearable terminal to communicate with each other, and establishing a second frequency point for the wearable terminal to communicate with an area reader-writer, wherein the area reader-writer is equipment which is arranged in each area and performs data interaction with the wearable terminal;
the regional personnel number acquisition module is used for providing the second frequency point for the wearable terminal and acquiring the personnel number N in the current region from the regional reader-writer;
the short packet sending and receiving module is used for providing the wearable terminal with a first frequency point, monitoring a current wireless channel, broadcasting and sending short packets to other wearable terminals in an area when the channel is idle, and receiving and recording and analyzing the short packets broadcasted by the other wearable terminals in the area after the short packet is sent;
A long packet sending module, configured to provide the wearable terminal with information including an ID of the terminal, the short packet broadcasted by the wearable terminal in the recorded area, and a current timestamp, package the information into a long packet, and send the long packet to the area reader-writer at the second frequency point;
the regional personnel number updating module is used for providing the regional reader-writer with the personnel number in the current time of the current region according to the long packet in a period of time, analyzing and calculating the personnel number in the current time of the current region, and updating the personnel number N in the current region;
the interactive situation awareness model building module is used for providing the regional reader-writer with the data comprising the long package and the position information to be packed into a regional situation data package, uploading the regional situation data package to a school integrated management platform, and combining a school three-dimensional simulation map to build a crowd interactive situation awareness model oriented to middle and primary schools.
Further, the short packet sending and receiving module further includes:
the short packet sending unit is configured to monitor a current wireless channel, and broadcast and send a short packet to the other wearable terminals in the area when the channel is idle, where the short packet sending unit specifically includes: monitoring a current radio channel, when the channel is busy, at [1, N ]Starting a dormancy timer to enable the wearable terminal to enter a dormancy waiting mode, wherein the timing duration of the dormancy timer is as follows: t (T) TX When the dormancy timer ends, the current wireless channel continues to be monitored,until the channel is idle, wherein the unit time length is the time length of broadcasting the short packet by the wearable terminal; when the channel is idle, broadcasting and transmitting the short packet to other wearable terminals in the area by using the first frequency point;
and a short packet receiving unit, configured to receive, after the short packet is sent, the short packet that is recorded and parsed and broadcast by the other wearable terminals in the area, where a manner of receiving the short packet is as follows: starting the short packets broadcast by other wearable terminals in a receiving area of a receiving timer, wherein the timing duration of the receiving timer is set as T RX Time length of =n x unit.
Further, the crowd interaction situation awareness system facing the primary and secondary schools further comprises: the data packet establishing module is used for establishing data packets including short packets, long packets and area situation data packets;
the data packet establishing module further includes:
The short packet establishing unit establishes the short packet which is broadcasted and sent to other wearable terminals by the wearable terminal, and the specific format of the short packet is as follows: the type code is the model of the wearable terminal, and the accuracy of the transmission data in the short packet is verified through the summation check code;
the long packet establishing unit establishes the long packet sent by the wearable terminal to the area reader-writer, and the specific format of the long packet is as follows: the ID of the wearable terminal, the ID of the area reader-writer, the current timestamp, the collection of all IDs of the wearable terminal in the area obtained through analysis and the CRC check code;
the regional situation data packet establishing unit establishes the regional situation data packet sent by the regional reader-writer to the school comprehensive management platform, wherein the specific format of the regional situation data packet is as follows: and the set of all received long packets sent by the wearable terminal is plus the position information of the area reader-writer.
Compared with the prior art, the invention has at least one of the following beneficial effects:
(1) The crowd interaction situation awareness method for primary and secondary schools comprises the following steps: s1: establishing a wearable terminal provided for students in middle and primary schools to wear, establishing a first frequency point for the wearable terminal to communicate with each other, and establishing a second frequency point for the wearable terminal to communicate with an area reader-writer, wherein the area reader-writer is equipment which is arranged in each area and performs data interaction with the wearable terminal; s2: the wearable terminal acquires the number N of people in the current area from the area reader-writer by using the second frequency point; s3: the wearable terminal switches to a first frequency point, monitors a current wireless channel, broadcasts and sends short packets to other wearable terminals in an area when the channel is idle, and receives records and analyzes the short packets broadcasted by the other wearable terminals in the area after the short packets are sent; s4: the wearable terminal packs the information comprising the ID of the terminal, the short packet broadcasted by the wearable terminal in the recorded area and the current time stamp into a long packet, and sends the second frequency to the area reader; s5: the regional reader-writer analyzes and calculates the number of people in the current moment of the current region according to the long packet in a period of time, updates the number N of people in the current region, and jumps to S2; s6: and the regional reader-writer packages the data comprising the long package and the position information into a regional situation data package, uploads the regional situation data package to a school comprehensive management platform, and combines a school three-dimensional simulation map to construct a crowd interaction situation perception model oriented to middle and primary schools. The technical scheme has high positioning precision and low cost, and is particularly suitable for application scenes such as middle and primary school students and the like which cannot carry mobile phones.
(2) And establishing a first frequency point for the wearable terminals to communicate with each other, and establishing a second frequency point for the wearable terminals to communicate with an area reader-writer. According to the technical scheme, communication between the wearable terminals is separated from communication between the wearable terminals and the area reader-writer, and the communication is carried out on different frequency points respectively, so that the orderly communication between the devices is ensured.
(3) And packaging the data comprising the long package and the position information into a regional situation data package through a regional reader-writer, uploading the regional situation data package to a school comprehensive management platform, and constructing a crowd interaction situation perception model oriented to middle and primary schools by combining a school three-dimensional simulation map. According to the technical scheme, the crowd interaction situation perception model oriented to middle and primary schools is built by combining the three-dimensional simulation map, the crowd interaction situation is clearly shown on the three-dimensional model map, school management staff can clearly see the crowd interaction situation, and the data packet uploaded by the regional reader-writer does not need to be analyzed by wasting manpower.
(4) By when the channel is busy, in [1, N]Starting a dormancy timer to enable the wearable terminal to enter a dormancy waiting mode, wherein the timing duration of the dormancy timer is as follows: t (T) TX And when the dormancy timer is ended, continuing to monitor the current wireless channel until the channel is idle, wherein the unit time is the time for broadcasting the short packet by the wearable terminal. According to the technical scheme, the timing duration of the dormancy timer is designed to be R-unit duration by selecting one random number R, and because the time of dormancy is different each time, the communication time of each wearable terminal can be ensured not to conflict, and the problem that all the wearable terminals concentrate on the same time point to send short packets, so that frequency point congestion is caused and the short packets of the wearable terminals are not sent out is avoided.
(5) By adding the summation check code in the short packet and adding the CRC check code in the long packet, the accuracy of the data packet is ensured.
Drawings
FIG. 1 is an overall flow chart of a crowd interaction situation awareness method for primary and secondary schools;
FIG. 2 is a detailed flow chart of a crowd interaction situation awareness model oriented to primary and secondary schools;
FIG. 3 is an overall structure diagram of the crowd interaction situation awareness system for primary and secondary schools;
fig. 4 is a block diagram of a short packet sending and receiving module in a crowd interaction situation awareness system for primary and secondary schools;
Fig. 5 is a block diagram of a data packet building module in a crowd interaction situation awareness system for primary and secondary schools.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
In the existing positioning technology, the problems of poor positioning accuracy and high cost exist. And the most serious problem is that aiming at students in middle and primary schools, mobile phones are not allowed to be carried during the course, and positioning and interaction situation sensing cannot be performed through the mobile phones, so that crowd interaction situation sensing aiming at the students in middle and primary schools cannot be performed.
Based on the application scene, the core thought of the invention is as follows: the brand new crowd interaction situation sensing method for middle and primary schools is designed, and interaction situation sensing among the crowds of the middle and primary schools can be achieved by enabling students to wear a simple and cheap wearable terminal and installing an area reader-writer in an appointed area. Further, the perceived interactive situation is uploaded to a school comprehensive management platform through the area reader-writer, and a crowd interactive situation perception model facing primary and secondary schools is built by combining a three-dimensional simulation map of the school, so that management staff of the school can clearly see the interactive situation of students at a glance.
The invention has the remarkable characteristics that: the mobile phone interaction method is particularly suitable for the crowd of students in middle and primary schools who cannot carry mobile phones, interaction situation perception of personal rights can be achieved by simply wearing one wearable terminal, equipment cost is low, and perception accuracy is high.
First embodiment
Fig. 1 shows a specific flow chart of the crowd interaction situation awareness method for primary and secondary schools. It comprises the following steps:
s1: establishing a wearable terminal provided for students in middle and primary schools to wear, establishing a first frequency point for the wearable terminal to communicate with each other, and establishing a second frequency point for the wearable terminal to communicate with an area reader-writer, wherein the area reader-writer is equipment which is arranged in each area and performs data interaction with the wearable terminal.
In particular, in this embodiment, since the main application object of the present invention is a pupil that cannot carry a mobile phone to school during a class, it is first necessary to create a terminal that is convenient for the pupil to carry and has not too many functions, so that the pupil can carry. Preferably, a wearable terminal may be selected, for example a card machine designed in the form of a watch or pendant or the like. Of course, the above example is only a preferred embodiment, and all devices that can be used for communication are possible to design as terminals of the present invention. The application scene of the invention is not limited to primary and secondary school students, and can be applied to other scenes and other places, but the scheme of the invention is particularly suitable for application scenes of primary and secondary schools, and other crowd interaction situation sensing schemes in the prior art cannot be applied to application scenes of primary and secondary schools.
The area reader-writer is an area reader-writer arranged in a certain area, for example, an area reader-writer is arranged in a classroom, a playground and the like, and data interaction is carried out with a wearable terminal in the current classroom or playground.
In order to enable communication among various devices to be smoother and easier, the invention enables communication among the wearable terminals and the area reader-writer to be carried out through two different frequency points, and the two communication are not mutually influenced. Mutual communication between the wearable terminals and the area reader-writer can be performed simultaneously.
S2: and the wearable terminal acquires the number N of people in the current area from the area reader-writer by using the second frequency point.
Specifically, in this example, the number of people in the current area needs to be acquired before communication between wearable terminals is performed. The function of acquiring the number of people in the current area is as follows: (1) The number of wearable terminals for interactive situation awareness with the current wearable terminals is obtained, so that the number of people in the current area can be known, namely, in case of infection cases found in the current area in the later period, the people in the current area are people needing to be isolated. (2) For information communication between subsequent wearable terminals, a time reference is provided, namely, the timing time of the timer is designed according to the number of people in the current area.
S3: the wearable terminal switches to a first frequency point, monitors a current wireless channel, broadcasts and sends short packets to other wearable terminals in an area when the channel is idle, and receives records and analyzes the short packets broadcasted by the other wearable terminals in the area after the short packets are sent.
Specifically, in this example, since only one wearable terminal can broadcast or receive data at a time at the same frequency point, the wearable terminal needs to monitor whether the wireless channel of the current channel in the current area is idle or not before broadcasting, and can broadcast or receive data only when the wireless channel is idle.
Monitoring a current wireless channel, and broadcasting and sending short packets to other wearable terminals in an area when the channel is idle, wherein the method specifically comprises the following steps:
monitoring a current radio channel, when the channel is busy, at [1, N]Starting a dormancy timer to enable the wearable terminal to enter a dormancy waiting mode, wherein the timing duration of the dormancy timer is as follows: t (T) TX And when the dormancy timer is ended, continuing to monitor the current wireless channel until the channel is idle, wherein the unit time is the time for broadcasting the short packet by the wearable terminal. The design has the advantages that the timing time length of the dormancy timer is designed to be R unit time length by selecting one random number R, and because the time of dormancy is different each time, the communication time of each wearable terminal can be ensured not to collide, and the problems that all the wearable terminals concentrate on the same time point to send short packets, so that frequency points are jammed and the short packets of the wearable terminals are not sent out are avoided.
According to the method, the current channel is continuously monitored, and only when the monitored channel is idle, the short packet is broadcast and sent to other wearable terminals in the area by the first frequency point.
After the short packet is sent, receiving the short packet which is recorded and is broadcasted by other wearable terminals in the analysis area, and further comprising:
starting the short packets broadcast by other wearable terminals in a receiving area of a receiving timer, wherein the timing duration of the receiving timer is set as T RX Time length of =n x unit.
Specifically, in this embodiment, since it is necessary to acquire all the short packets broadcast by the wearable terminal at the same time, each short packet needs a unit duration, and thus the duration of the reception timer is designed to be n×unit duration.
S4: and the wearable terminal packages the information comprising the ID of the terminal, the short packet broadcasted by the wearable terminal in the recorded area and the current time stamp into a long packet, and sends the second frequency to the area reader-writer.
Specifically, in this embodiment, after receiving all the short packets sent by other wearable terminals, the wearable terminal needs to package all the short packets together with the ID number of the wearable terminal and the current timestamp into one long packet, and send the long packet to the area reader-writer, so as to facilitate the subsequent area reader-writer to upload data, and perform data analysis. Through the long package sent by each wearable terminal, the interaction situation awareness of the people wearing the current wearable terminal and the people can be seen.
S5: the area reader-writer analyzes and calculates the number N of people in the current moment of the current area according to the long packet in a period of time update And updating the number N of people in the current area, and jumping to S2.
Wherein, the personnel number N in the current moment in the current area is calculated by analysis update The method specifically comprises the following steps: firstly, analyzing the equipment type number of the wearable terminal, analyzing the ID numbers of all the wearable terminals in the area corresponding to the area reader-writer, sending the ID numbers of all the wearable terminals in the area to the background, and counting the number of the ID numbers of the wearable terminals.
S6: and the regional reader-writer packages the data comprising the long package and the position information into a regional situation data package, uploads the regional situation data package to a school comprehensive management platform, and combines a school three-dimensional simulation map to construct a crowd interaction situation perception model oriented to middle and primary schools.
Specifically, in order to enable the manager of the school to more conveniently perceive the crowd interaction situation, the regional reader-writer disclosed by the invention also packages the data comprising the long package and the position information into the regional situation data package, uploads the regional situation data package to the school comprehensive management platform, builds a crowd interaction situation perception model for primary and secondary schools by combining a three-dimensional simulation map of the school, clearly displays the crowd interaction situation on the three-dimensional model map, and the school manager can clearly see the crowd interaction situation without wasting manpower to analyze the data package uploaded by the regional reader-writer.
Further, the specific format of the short packet is as follows: the type code is the model of the wearable terminal, and the accuracy of the transmission data in the short packet is verified through the summation check code.
Further, the specific format of the long packet is as follows: the ID of the wearable terminal, the ID of the area reader-writer, the current timestamp, the collection of all IDs of the wearable terminal in the area obtained through analysis and the CRC check code.
Further, the specific format of the area situation data packet is as follows: and the set of all received long packets sent by the wearable terminal is plus the position information of the area reader-writer.
Second embodiment
The embodiment provides a specific embodiment of a crowd interaction situation awareness method for primary and secondary schools, which comprises the following steps:
taking school A as an example, students are provided with a 4G card machine as a wearable terminal, the 4G card machine is provided with GPS/BD positioning (school outside), 2.4GHz positioning (school inside), a first frequency point is established to be 2.4GHz and used for mutual communication between the wearable terminals, information aggregation in the school is realized, a second frequency point is established to be 125KMHz and used for communication between the wearable terminal and an area reader-writer, and situation awareness of students in the school is realized. The card machine ID is a 4 byte long integer, broadcast short packets (P S ) The specific format of (2) is: type code (1 byte) +native ID (4 bytes) +checksum (1 byte), unit duration (T u ): in order to broadcast the duration of the short packet (different MCUs, modulations, etc. are slightly unnecessary, and the actual measurement is based), all the area readers are connected through a wired network, and the protocol is TCP/IP.
(1) The card machine ID of the student M is M, the current regional personnel number is obtained from the regional reader-writer S by using the frequency point of 2.4GHz, and 10 persons are taken as an example.
(2) Switching to 125KMHz, monitoring the current wireless channel, selecting random number within 1-10 when the channel is busy, starting timer (T TX ＝5×T u ) Enters sleep mode, timer (T) TX ) And (3) continuing to monitor the current wireless channel, and turning to step (3) when the channel is idle, otherwise, continuing to execute step (2).
(3) Card machine m constructs and broadcasts short packets with frequency point of 125KMHzP S )。
(4) After the transmission is completed, the card machine m enters a reception mode, and starts a timer (T RX ＝10×T u ) Receiving and recording broadcast short packets of surrounding card machines, analyzing and obtaining ID (identity) of the card machines, n 1 ，n 2 ，...，n n 。
(5) Timer (T) RX ) Finally, analyzing the ID of the card machine to obtain the ID of the card machine, n 1 ， n 2 ，...，n n Along with the current timestamp TS, a long packet (P L ): source address (card machine ID,4 bytes) +destination address (area reader ID,4 bytes) +timestamp (4 bytes) +payload (resolved and obtained card machine ID set) +crc16 check code.
(6) The card machine m switches the frequency point to be 2.4GHz and sends the frequency point to the regional reader-writer S.
(7) The reader-writer S in the area periodically (for example, 5 minutes) analyzes and calculates the number of people N in the current area according to the long packet in a period of time update And updated to N, for example 8,
(8) The card machine m acquires the number of personnel in the current area from the area reader-writer at the frequency point of 2.4GHz, updates N to 8, and jumps to the step 2.
(9) The regional reader-writer S constructs a regional situation data IP packet by using the received long packet and the position information sent by each card machine, wherein the payload of the IP packet: long packet+location information (4 bytes) sent by card machine.
(10) The regional reader-writer S uploads the regional situation data IP packet to a school comprehensive management platform, and the platform combines a school three-dimensional simulation map to display a crowd interaction situation perception space-time model for primary and secondary schools. Third embodiment
As shown in fig. 3, the invention is a specific structure diagram of a crowd interaction situation awareness system for primary and secondary schools, which comprises: the system comprises a communication basic equipment building module 1, an area personnel number acquisition module 2, a short packet sending and receiving module 3, a long packet sending module 4, an area personnel number updating module 5 and an interactive situation perception model building module 6;
The communication basic equipment establishing module 1 is used for establishing a wearable terminal provided for students in middle and primary schools to wear, establishing a first frequency point for the wearable terminal to communicate with each other, and establishing a second frequency point for the wearable terminal to communicate with an area reader-writer, wherein the area reader-writer is equipment which is arranged in each area and performs data interaction with the wearable terminal;
the regional personnel number acquisition module 2 is used for providing the second frequency point for the wearable terminal and acquiring the personnel number N in the current region from the regional reader-writer;
the short packet sending and receiving module 3 is used for providing the wearable terminal with a first frequency point, monitoring a current wireless channel, broadcasting and sending short packets to other wearable terminals in an area when the channel is idle, and receiving and recording and analyzing the short packets broadcasted by the other wearable terminals in the area after the short packet is sent;
a long packet sending module 4, configured to provide the wearable terminal with a long packet, and package the information including the ID of the terminal, the short packet broadcasted by the wearable terminal in the recorded area, and the current timestamp into a long packet, and send the long packet to the area reader-writer at the second frequency point;
The regional personnel number updating module 5 is used for providing the regional reader-writer with the personnel number in the current time of the current region according to the long packet in a period of time, analyzing and calculating the personnel number in the current time of the current region, and updating the personnel number N in the current region;
the interactive situation awareness model building module 6 is used for providing the regional reader-writer with the data comprising the long package and the position information to be packed into a regional situation data package, uploading the regional situation data package to a school integrated management platform, and combining a school three-dimensional simulation map to build a crowd interactive situation awareness model oriented to primary and secondary schools.
Further, as shown in fig. 4, the short packet sending and receiving module 3 further includes:
a short packet transmitting unit 31 for monitoring the current wireless channel, and transmitting the current wireless channel to other stations in the area when the current wireless channel is idleThe wearable terminal broadcasts and sends short packets, specifically: monitoring a current radio channel, when the channel is busy, at [1, N]Starting a dormancy timer to enable the wearable terminal to enter a dormancy waiting mode, wherein the timing duration of the dormancy timer is as follows: t (T) TX When the dormancy timer is finished, continuing to monitor the current wireless channel until the channel is idle, wherein the unit time is the time for broadcasting the short packet by the wearable terminal; when the channel is idle, broadcasting and transmitting the short packet to other wearable terminals in the area by using the first frequency point;
And a short packet receiving unit 32, configured to receive, after the short packet is sent, the short packet broadcast by the other wearable terminals in the recording and parsing area, where a manner of receiving the short packet is: starting the short packets broadcast by other wearable terminals in a receiving area of a receiving timer, wherein the timing duration of the receiving timer is set as T RX Time length of =n x unit.
Further, the crowd interaction situation awareness system facing the primary and secondary schools further comprises: the data packet establishing module 7 is used for establishing data packets including short packets, long packets and area situation data packets;
the packet creation module 7 further includes:
a short packet establishing unit 71, configured to establish the short packet broadcast by the wearable terminal to other wearable terminals, where the specific format of the short packet is: the type code is the model of the wearable terminal, and the accuracy of the transmission data in the short packet is verified through the summation check code;
a long packet establishing unit 72, configured to establish the long packet sent by the wearable terminal to the area reader, where the specific format of the long packet is: the ID of the wearable terminal, the ID of the area reader-writer, the current timestamp, the collection of all IDs of the wearable terminal in the area obtained through analysis and the CRC check code;
The regional situation data packet establishing unit 73 establishes the regional situation data packet sent by the regional reader-writer to the school comprehensive management platform, where the specific format of the regional situation data packet is as follows: and the set of all received long packets sent by the wearable terminal is plus the position information of the area reader-writer.
A computer readable storage medium storing computer code which, when executed, performs a method as described above. Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program to instruct related hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
The software program of the present invention may be executed by a processor to perform the steps or functions described above. Likewise, the software programs of the present invention (including associated data structures) may be stored on a computer readable recording medium, such as RAM memory, magnetic or optical drive or diskette and the like. In addition, some of the steps or functions of the present invention may be implemented in hardware, for example, as circuitry that cooperates with the processor to perform various functions or steps. The methods disclosed in the embodiments shown in the embodiments of the present specification may be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Net work Processor, NP), etc.; but also digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of this specification may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present specification may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.
Embodiments also provide a computer readable storage medium storing one or more programs that, when executed by an electronic system comprising a plurality of application programs, cause the electronic system to perform the method of embodiment one. And will not be described in detail herein.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (P RAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-RO M), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (tr ansitory media), such as modulated data signals and carrier waves.
The system, apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. One typical implementation is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices. Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PR AM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium which can be used to store information which can be accessed by the computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transitor y media), such as modulated data signals and carrier waves. It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
Furthermore, portions of the present invention may be implemented as a computer program product, such as computer program instructions, which when executed by a computer, may invoke or provide methods and/or techniques in accordance with the present invention by way of operation of the computer. Program instructions for invoking the inventive methods may be stored in fixed or removable recording media and/or transmitted via a data stream in a broadcast or other signal bearing medium and/or stored within a working memory of a computer device operating according to the program instructions. An embodiment according to the invention comprises an apparatus comprising a memory for storing computer program instructions and a processor for executing the program instructions, wherein the computer program instructions, when executed by the processor, trigger the apparatus to operate a method and/or a solution according to the embodiments of the invention as described above.
Claims (7)
1. The crowd interaction situation awareness method for primary and secondary schools is characterized by comprising the following steps of:
s1: establishing a wearable terminal provided for students in middle and primary schools to wear, establishing a first frequency point for the wearable terminal to communicate with each other, and establishing a second frequency point for the wearable terminal to communicate with an area reader-writer, wherein the area reader-writer is equipment which is arranged in each area and performs data interaction with the wearable terminal;
S2: the wearable terminal acquires the number N of people in the current area from the area reader-writer by using the second frequency point;
s3: the wearable terminal switches to a first frequency point, monitors a current wireless channel, broadcasts and sends a short packet to other wearable terminals in an area when the channel is idle, and receives and records and analyzes the short packet broadcasted by the other wearable terminals in the area after the short packet is sent, wherein the specific format of the short packet is as follows: the type code is the model of the wearable terminal, and the accuracy of the transmission data in the short packet is verified through the summation check code;
s4: the wearable terminal packages the information comprising the ID of the terminal, the short packet broadcasted by the wearable terminal in the recorded area and the current time stamp into a long packet, and sends the long packet to the area reader-writer through the second frequency point, wherein the specific format of the long packet is as follows: the ID of the wearable terminal, the ID of the area reader-writer, the current timestamp, the collection of all IDs of the wearable terminal in the area obtained through analysis and the CRC check code;
S5: the regional reader-writer analyzes and calculates the number of people in the current moment of the current region according to the long packet in a period of time, updates the number N of people in the current region, and jumps to S2;
s6: and the regional reader-writer packages the data comprising the long package and the position information into a regional situation data package, uploads the regional situation data package to a school comprehensive management platform, and combines a school three-dimensional simulation map to construct a crowd interaction situation perception model oriented to middle and primary schools.
2. The crowd interaction situation awareness method for middle and primary schools according to claim 1, wherein in step S3, a current wireless channel is monitored, and when the channel is idle, short packets are broadcast and sent to other wearable terminals in an area, specifically:
monitoring a current radio channel, when the channel is busy, at [1, N]Starting a dormancy timer to enable the wearable terminal to enter a dormancy waiting mode, wherein the timing duration of the dormancy timer is as follows: t (T) TX When the dormancy timer is finished, continuing to monitor the current wireless channel until the channel is idle, wherein the unit time is the time for broadcasting the short packet by the wearable terminal;
And when the channel is idle, broadcasting and transmitting the short packet to other wearable terminals in the area by using the first frequency point.
3. The crowd interaction situation awareness method for middle and primary schools according to claim 2, wherein in step S3, after the short packet is sent, the short packet broadcasted by the other wearable terminals in the recording and analyzing area is received, and further includes:
starting the short packets broadcast by other wearable terminals in a receiving area of a receiving timer, wherein the timing duration of the receiving timer is set as T RX Time length of =n x unit.
4. The crowd interaction situation awareness method for primary and secondary schools according to claim 1, wherein the specific format of the regional situation data packet is as follows: and the set of all received long packets sent by the wearable terminal is plus the position information of the area reader-writer.
5. The crowd interaction situation awareness system for primary and secondary schools is characterized by comprising: the system comprises a communication basic equipment building module, an area personnel number acquisition module, a short packet sending and receiving module, a long packet sending module, an area personnel number updating module and an interactive situation perception model building module;
The communication basic equipment establishing module is used for establishing a wearable terminal provided for students in middle and primary schools to wear, establishing a first frequency point for the wearable terminal to communicate with each other, and establishing a second frequency point for the wearable terminal to communicate with an area reader-writer, wherein the area reader-writer is equipment which is arranged in each area and performs data interaction with the wearable terminal;
the regional personnel number acquisition module is used for providing the second frequency point for the wearable terminal and acquiring the personnel number N in the current region from the regional reader-writer;
the short packet sending and receiving module is used for providing the wearable terminal with a first frequency point, monitoring a current wireless channel, broadcasting and sending short packets to other wearable terminals in an area when the channel is idle, and receiving and recording and analyzing the short packets broadcasted by the other wearable terminals in the area after the short packet is sent;
a long packet sending module, configured to provide the wearable terminal with information including an ID of the terminal, the short packet broadcasted by the wearable terminal in the recorded area, and a current timestamp, package the information into a long packet, and send the long packet to the area reader-writer at the second frequency point;
The regional personnel number updating module is used for providing the regional reader-writer with the personnel number in the current time of the current region according to the long packet in a period of time, analyzing and calculating the personnel number in the current time of the current region, and updating the personnel number N in the current region;
the interactive situation awareness model building module is used for providing the regional reader-writer with the data comprising the long package and the position information to be packed into a regional situation data package, uploading the regional situation data package to a school comprehensive management platform, and combining a school three-dimensional simulation map to build a crowd interactive situation awareness model oriented to primary and secondary schools;
the data packet establishing module is used for establishing data packets including short packets, long packets and area situation data packets;
the data packet establishing module further includes:
the short packet establishing unit establishes the short packet which is broadcasted and sent to other wearable terminals by the wearable terminal, and the specific format of the short packet is as follows: the type code is the model of the wearable terminal, and the accuracy of the transmission data in the short packet is verified through the summation check code;
the long packet establishing unit establishes the long packet sent by the wearable terminal to the area reader-writer, and the specific format of the long packet is as follows: the ID of the wearable terminal, the ID of the area reader-writer, the current timestamp, the collection of all IDs of the wearable terminal in the area obtained through analysis and the CRC check code;
The regional situation data packet establishing unit establishes the regional situation data packet sent by the regional reader-writer to the school comprehensive management platform, wherein the specific format of the regional situation data packet is as follows: and the set of all received long packets sent by the wearable terminal is plus the position information of the area reader-writer.
6. The crowd interaction situation awareness system for middle and primary schools of claim 5, wherein the short packet sending and receiving module further comprises:
the short packet sending unit is configured to monitor a current wireless channel, and broadcast and send a short packet to the other wearable terminals in the area when the channel is idle, where the short packet sending unit specifically includes: monitoring a current radio channel, when the channel is busy, at [1, N]Starting a dormancy timer to enable the wearable terminal to enter a dormancy waiting mode, wherein the timing duration of the dormancy timer is as follows: t (T) TX When the dormancy timer is finished, continuing to monitor the current wireless channel until the channel is idle, wherein the unit time is the time for broadcasting the short packet by the wearable terminal; when the channel is idle, broadcasting and transmitting the short packet to other wearable terminals in the area by using the first frequency point;
And a short packet receiving unit, configured to receive, after the short packet is sent, the short packet that is recorded and parsed and broadcast by the other wearable terminals in the area, where a manner of receiving the short packet is as follows: starting the short packets broadcast by other wearable terminals in a receiving area of a receiving timer, wherein the timing duration of the receiving timer is set as T RX Time length of =n x unit.
7. A computer readable storage medium storing computer code which, when executed, performs the method of any one of claims 1 to 4.
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