Emergency method for real-time tracking and contact risk prevention and control of centralized quarantine crowd

Abstract

The application provides a centralized quarantine crowd real-time tracking and contact risk prevention and control emergency system, the system detects the environmental change of the quarantine point by using a CO2 sensor, the position information of the quarantine personnel is acquired in real time by using a trajectory method of the quarantine personnel based on an IMU and map information, the contact point risk of the quarantine personnel at the quarantine point is analyzed in combination with the quarantine result and the trajectory information of the quarantine personnel at the quarantine point, and the technical scheme of the disclosure can evaluate the environmental information of the quarantine point, analyze the position information of the quarantine personnel in the quarantine point in real time, deduce the contact degree risk of the quarantine personnel in the quarantine process, is favorable for tracking investigation after the quarantine is completed, and is favorable for efficient and safe implementation of a large-scale centralized quarantine point.

Description

Technical Field

[0001] This invention belongs to the field of infectious disease prevention and control, specifically an emergency method for real-time tracking and contact risk prevention and control of people under centralized quarantine. Background Technology

[0002] During large-scale centralized quarantine, testing sites are often set up in communities, with people moving within small areas in a short period, resulting in extremely high population density and close contact. Testing itself involves long queues and complex data entry, further increasing the risk of cross-infection among testing personnel and posing new challenges to epidemic prevention and control. The workload is even greater in subsequent stages, including tracing the movement paths of quarantined individuals, counting the number and location of potential infected persons, and reviewing the transmission routes of the epidemic. To address these situations, it is necessary to implement flow control at testing sites, statistically analyze the queuing and testing trajectories of individuals at testing sites, and assess the risk of cross-infection. Summary of the Invention

[0003] To address the aforementioned technical issues, this invention proposes an emergency method for real-time tracking and contact risk prevention of people under centralized quarantine. This method can help staff track the location and flow of people at quarantine points, assess the risk of contact during the quarantine process, and contribute to safe quarantine.

[0004] An emergency method for real-time tracking and contact risk prevention of people under centralized quarantine, characterized by the following steps:

[0005] (1) A method for obtaining the trajectory of quarantine personnel based on IMU and map;

[0006] The method for obtaining personnel trajectories based on IMU and map matching includes:

[0007] People who need centralized quarantine Upon arriving at the quarantine checkpoint entrance, use your mobile phone to obtain map information of the checkpoint and set your initial location as [location to be filled in]. Update personnel using PDR algorithm The estimated position at time is The distance along the queuing path is the distance for updating map information. To obtain the ideal position The person in front of the group, i.e., the first person... People The position of time is considered to be the first People Expected location at time The three estimated coordinates are fused using the Kalman filter algorithm to obtain the personnel data. exist The optimal estimate of the position at time step is given by the following state equation: ,in The weights are 1, Set to Gaussian white noise for process noise;

[0008] The location information and time information of personnel are combined to form trajectory information, which is then uploaded to the server;

[0009] (2) Assess the time period of quarantine personnel at the quarantine point. Risk of contact within;

[0010] The risk assessment of those involved in quarantine can be divided into the following steps;

[0011] Define the first quarantine area Individuals in The risk of quarantine at any time is ,but . This indicates one's own risk level, and its value is entirely determined by the quarantine results.

[0012]

[0013] In the formula, , This represents the infection risk value, among which Value and number of tests Related, when the number of tests When the number exceeds the prevention and control requirements, The value is 0, otherwise It is a value close to 0. It is a set maximum value;

[0014] in Indicates the first Personal opinion on the first The individual's risk impact, its value is determined by the first The individual's risk level, the current environment of the quarantine site, and the degree of contact between the two individuals determine the situation, as expressed in the following formula:

[0015]

[0016] In the formula, This indicates the average CO2 concentration of the two individuals within the same quarantine area during the same time period. This indicates the time the two people spent together in the quarantine area. This indicates the minimum distance between two people within the same quarantine area during the same time period;

[0017] The contact risk and timing of personnel at the inspection point during the time period t will be uploaded.

[0018] When the results of centralized quarantine are updated, the contact risk of the people who participated in the centralized quarantine is also updated accordingly. For the people who participated in the quarantine, the maximum contact risk of the people within the time period t is used as the screening basis for screening, and separate quarantine is arranged.

[0019] As a further improvement of the present invention, the hardware components of the centralized quarantine population real-time tracking and contact risk prevention and control emergency system include:

[0020] CO2 sensor, data storage module, server processing module, mobile terminal.

[0021] Multiple CO2 sensors are deployed in the queuing area to send the detected CO2 concentration to the server. Once the concentration exceeds the threshold, an alarm message is sent to the staff to increase ventilation and adjust the spacing between quarantine personnel.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] To address the issues of irregular queuing and high risk of contact among quarantine personnel during large-scale centralized quarantine, a real-time tracking and emergency prevention system for contact risks of centralized quarantine personnel was designed. This system helps assess the environment of the quarantine site and ensure timely ventilation during the quarantine process. Addressing the issue of large cumulative errors in traditional PDR methods, an IMU / map positioning method was developed, combining the queuing characteristics of the quarantine site with the location information of nearby personnel, to obtain personnel trajectory information. By combining the trajectory information of each person at the quarantine site with the post-quarantine results, the system updates the contact risk in a timely manner, facilitating the reverse tracing of close contacts after quarantine.

[0024] This invention addresses the problem of large-scale quarantine by proposing a real-time tracking and contact risk emergency control system for centralized quarantine populations. It makes full use of prior information such as queuing and quarantine point maps to effectively improve the cumulative error problem of PDR (Personal Data Recognition). Combined with the spatiotemporal trajectory information of quarantine personnel, it assesses the contact risk of quarantine personnel and assists in safe quarantine. Attached Figure Description

[0025] Figure 1 A system diagram of the emergency system for real-time tracking and contact risk prevention and control of people under centralized quarantine;

[0026] Figure 2 A layout plan of a quarantine checkpoint;

[0027] Figure 3 This is a flowchart of a method for obtaining the trajectory of quarantine personnel based on IMU and map. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] This invention provides an emergency method for real-time tracking and contact risk prevention of people under centralized quarantine, which is used to track the movement trajectory of people under centralized quarantine, assess the contact risk of people, and assist in safe quarantine.

[0030] like Figure 1 The diagram shows the structure of the emergency system for real-time tracking and contact risk prevention of people under centralized quarantine.

[0031] like Figure 2 The image shows a layout plan of a quarantine checkpoint.

[0032] The system consists of a CO2 sensor, a data storage module, a server processing module, and a mobile terminal.

[0033] Multiple CO2 sensors are deployed at key points in the queuing area to detect real-time CO2 concentrations throughout the quarantine site and transmit the data to a server. If the concentration exceeds a set threshold, on-site staff are alerted to assist with ventilation and check the spacing between queuing individuals. The mobile terminals are smartphones used by quarantine personnel to obtain their identity and location information, as well as to provide feedback on their nucleic acid test results and the contact risks associated with the quarantine process.

[0034] like Figure 3 The diagram shows a flowchart of a method for obtaining the trajectory of quarantine personnel based on IMU and map.

[0035] Step S1: Method for obtaining personnel trajectories based on IMU and map. Specifically, this includes:

[0036] S1.1, Quarantine personnel Upon arriving at the entrance of the quarantine checkpoint, use your mobile phone to send your personal information to the platform, obtain a vector map of the quarantine checkpoint, and initialize your location. .

[0037] S1.2. Update personnel using the PDR (Pedestrian dead Reckoning) algorithm. The estimated position at time is ,Right now In the formula For pedestrian stride length, The pedestrian's heading angle.

[0038] The distance along the queuing path is the same as the map information update distance. To obtain the ideal position The person in front of the line, i.e., the first person... People The position of time is considered to be the first People Expected location at time .

[0039] S1.3. The three estimated coordinates are fused using the Kalman filtering algorithm to obtain the personnel coordinates. exist The optimal estimate of the position at time step is given by the following state equation: ,in The weights are 1, The process noise is set to Gaussian white noise.

[0040] The location and time information of personnel are combined and uploaded to the server.

[0041] Step S2: Assess the contact risk for individuals undergoing centralized quarantine. This includes:

[0042] S2.1 After quarantine is completed, update the contact risk of all personnel in the database based on the results.

[0043] Define the first quarantine area Individuals in The risk of quarantine at any time is ,but . This indicates one's own risk level, and its value is entirely determined by the quarantine results.

[0044]

[0045] In the formula, , This represents the infection risk value, among which Value and number of tests Related, when the number of tests When the number exceeds the prevention and control requirements, The value is 0, otherwise It is a value close to 0, such as 0.01. It is a set maximum value, such as 100.

[0046] Indicates the first Personal opinion on the first The individual's risk impact, its value is determined by the first The individual's risk level, the current environment of the quarantine site, and the degree of contact between the two individuals determine the situation, as expressed in the following formula:

[0047]

[0048] In the formula, This indicates the average CO2 concentration of the two individuals within the same quarantine area during the same time period. This indicates the time the two people spent together in the quarantine area. This indicates the minimum distance between two people within the same quarantine area during the same time period.

[0049] The contact risk and time of personnel at the inspection point during the t-time period will be uploaded.

[0050] S2.2 When the results of centralized quarantine are updated, the contact risk of the personnel participating in centralized quarantine will also be updated accordingly. For the people participating in quarantine, the maximum contact risk of the personnel within the time period t will be used as the screening basis for screening, and separate quarantine will be arranged.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any modifications or equivalent changes made based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. An emergency method for real-time tracking and contact risk prevention of people under centralized quarantine, characterized in that, The method includes the following steps: (1) A method for obtaining the trajectory of quarantine personnel based on IMU and map; Methods for obtaining the trajectories of quarantine personnel based on IMU and maps include: People who need centralized quarantine Upon arriving at the quarantine checkpoint entrance, use your mobile phone to obtain map information of the checkpoint and set your initial location as [location to be filled in]. Update personnel using PDR algorithm The estimated position at time is Update the distance along the queuing path based on map information. To obtain the ideal position The person in front of the group, i.e., the first person... People The position of time is considered to be the first People Expected location at time The Kalman filter algorithm is used to fuse the three estimated coordinates to obtain the personnel data. exist The optimal estimate of the position at time step is given by the following state equation: ,in The weights are 1, Set to Gaussian white noise for process noise; The location information and time information of personnel are combined to form trajectory information, which is then uploaded to the server; (2) Assess the time period of quarantine personnel at the quarantine point. Internal contact risk; Assess the time period of quarantine personnel at the quarantine point The risks of exposure within the body are divided into the following steps; Define the first quarantine area Individuals in The risk of quarantine at any time is ,but ,in This indicates one's own risk level, and its value is entirely determined by the quarantine results. ; In the formula, L(n), This represents the infection risk value, where the L(n) value is related to the number of tests. Related, when the number of tests When the value exceeds the prevention and control requirements, L(n) takes the value of 0; otherwise, L(n) is a value close to 0. It is a set maximum value; in Indicates the first Personal opinion on the first The individual's risk impact, its value is determined by the first The individual's risk level, the current environment of the quarantine site, and the degree of contact between the two individuals determine the situation, as expressed in the following formula: ; In the formula, This indicates the average CO2 concentration of the two individuals within the same quarantine area during the same time period. This indicates the time the two people were in the quarantine area together. This indicates the minimum distance between two people within the same quarantine area during the same time period; Upload the contact risk and time of personnel at the inspection point within the time period t. When the results of centralized quarantine are updated, the contact risk of the people who participated in the centralized quarantine is also updated accordingly. For the people who participated in the quarantine, the maximum contact risk of the people within the time period t is used as the screening basis for screening, and separate quarantine is arranged.

2. The emergency method for real-time tracking and contact risk prevention of people under centralized quarantine according to claim 1, characterized in that: The hardware components of the system corresponding to the emergency method for real-time tracking and contact risk prevention and control of people under centralized quarantine include: CO2 sensor, data storage module, server processing module, mobile terminal; Multiple CO2 sensors are deployed in the queuing area to send the detected CO2 concentration to the server. Once the concentration exceeds the threshold, an alarm message is sent to the staff to increase ventilation and adjust the spacing between quarantine personnel.

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