A medical equipment management system based on equipment positioning

By designing a hospital equipment management system based on WIFI access points and RFID electronic tags, the problem of how to quickly and accurately locate and manage medical equipment in a specific regional environment is solved, and efficient equipment query and management is achieved without increasing network signal burden.

CN114567853BActive Publication Date: 2025-04-25ZHEJIANG ZHIER INFORMATION TECH
View PDF 3 Cites 0 Cited by

Patent Information

Application Number
CN202210166361.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-02-23
Publication Date
2025-04-25
Estimated Expiration
2042-02-23

AI Technical Summary

Technical Problem

In a specific regional environment, how to manage medical equipment through equipment positioning can not only save system resources, but also quickly and accurately locate medical equipment without increasing network signal burden.

Method used

A hospital equipment management system based on WIFI access points, user terminals, medical equipment and remote servers is designed. An RFID electronic tag is provided on the medical device, and the WIFI access point collects, transmits, stores and processes access information by sensing the wireless radio frequency signals of the medical device. The remote server stores the location information of the WIFI access point and is associated with the location information of the hospital map. The user terminal obtains the management information of the medical device through query requests and displays its access location information on the map.

Benefits of technology

It realizes rapid and accurate positioning and management of medical equipment without increasing the burden of network signal, improves equipment query efficiency and reduces the amount of query information.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN114567853B_ABST
    Figure CN114567853B_ABST
Patent Text Reader

Abstract

The invention relates to the field of information processing, and discloses a medical equipment management system based on Internet of Things device positioning; the system comprises a WIFI access point, a user terminal, medical equipment and a remote server; access information is formed through RFID information of a user terminal device, the access information comprises clock information and network access information, the location attribute of the medical equipment is determined by presetting a mapping relationship between an access point device and a medical management device and hospital map layer information, and a cache query is set at the same time, thereby reducing the search range and the query amount, and facilitating the user to manage the search and positioning of the medical equipment.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The present invention relates to the field of information processing, and in particular to a medical management system based on equipment positioning. Background Art

[0002] As medical equipment becomes more and more diversified, intelligent query and management of medical equipment has become a trend. Equipment in different departments is becoming more and more similar. When equipment needs to be shared, the traditional manual management of medical equipment has gradually revealed its disadvantages, and it is impossible to obtain equipment information in real time. Therefore, the current equipment's WIFI signal positioning is needed in the management device and gradually applied. However, how to manage the equipment based on the positioning of the time in a specific regional environment can save system resources and locate the medical equipment at the same time. How to quickly display and locate the location information of the equipment without changing the network signal burden has become a demand. Summary of the invention

[0003] In order to solve at least one of the above technical problems, the present application provides a hospital equipment management system based on equipment positioning;

[0004] The system includes a WIFI access point, a user terminal, a medical device and a remote server; the WIFI access point exchanges access information with the medical device and stores the access information, wherein each medical device is provided with a sensor for sensing signals, and the WIFI access point collects, transmits, stores and processes the sensed signals;

[0005] The medical device is provided with an RFID electronic tag for identifying the ID information of the medical device; the wireless radio frequency signal of the medical device is sensed by the WIFI access point, and when the medical device chooses to access the WIFI access point, the WIFI access point records the access IP address and clock information of the medical device; the clock and IP address information are sent to a remote server; the remote server stores the location information of the WIFI access point, and the location information of the WIFI access point is mapped and associated with the location information of the hospital map;

[0006] When the user terminal accesses the information of the medical device through a query request, the WIFI connection point information of the medical device is obtained as an information index, the management information of the medical device is comprehensively obtained, and the associated WIFI access point information of the medical device is displayed on the map layer of the map hospital; the information index includes at least: the access IP address and the latest clock information of the medical device recorded by the WIFI access point.

[0007] Furthermore, when the user terminal queries the information of the medical device, the location information associated with the query keyword is automatically introduced.

[0008] Furthermore, it is characterized in that: the ID information is obtained from the coding information of the RFID tag on the medical device.

[0009] Furthermore, the user terminal accesses and communicates with the remote server and generates a query request interface, including: the remote server provides a query interface for each user device, constructs multiple different field information, each field constitutes a view, each view constitutes a classified business object, and the composed objects form a query request interface.

[0010] Furthermore, the remote server extracts keywords from the content attributes of the query information, selects a candidate suffix from the multiple candidate phrases based on the probability of becoming the next phrase of the content of the query information, and the candidate suffix refers to a candidate phrase with a probability higher than a preset probability; and generates a search term based on the candidate phrases and the candidate suffix.

[0011] Furthermore, a first-level cache and a second-level cache are set in the remote server to obtain the search keyword string from the query request and compare it with the existing strings in the first-level cache to determine whether there is an existing string in the first-level cache that is a prefix subset of the input search keyword string.

[0012] Furthermore, the remote server sets one of the multiple WIFI access points as a gateway device, and the gateway device allocates a manageable address to each managed terminal device, and monitors the load balance of each communication channel in different time periods.

[0013] Furthermore, the time information and MAC information of the medical device included in the access information are used for deduplication and positioning processing, and the remote server records the accessed clock information; the gateway device synchronizes the clock information of the WIFI wireless access point in the subnet.

[0014] Furthermore, the network where the system is located includes multiple subnets, each subnet has only one WIFI access point serving as a subnet gateway device, and one gateway manages multiple controllers; one controller controls multiple passive RFID readers or smart devices through wired connections; and one passive RFID reader controls multiple single antennas and array antennas, sensors, and acoustic and optical devices through a reading and writing module.

[0015] Furthermore, the gateway device stores information of the subnet WIFI access node, and when sending a broadcast packet to the subnet WIFI access point, adds clock distance adjustment information of each other subnet WIFI access node in the broadcast packet, so as to adjust the synchronization clock deviation of other subnet WIFI access nodes.

[0016] This system sets up access information formed by receiving RFID information of user terminal equipment, selects one from multiple WIFI nodes in the subnet as gateway device information, and associates the location information of the WIFI access point with the hospital map pre-set in the remote server. When the user searches for medical equipment, the location information of the WIFI node is first obtained through the access log information of the medical equipment and the nearest WIFI access point, and then the corresponding medical equipment information is obtained according to other attribute information, and displayed on the user device terminal, thereby improving the efficiency of positioning retrieval query. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a schematic diagram of this system. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1

[0021] like Figure 1 As shown, a hospital equipment management system based on equipment positioning is provided; the system includes a WIFI access point, a user terminal, a medical device and a remote server; the WIFI access point interacts with the medical device for access information and stores the access information, wherein each medical device is provided with a sensor for sensing signals, and the WIFI access point collects, transmits, stores and processes the sensed signals.

[0022] In the Internet of Things technology, the Internet of Things connects physical information and Internet information through sensor equipment technology, and realizes information sharing and interconnection between objects. Based on wireless radio frequency technology, it uses non-contact automatic identification technologies such as barcode technology, sound and image recognition technology, and radio frequency identification technology to identify multiple electronic tags that are in dynamic motion and input medical equipment data.

[0023] The medical device interacts with multiple wireless gateways or WIFI access points, and the WIFI access points or gateways store the access information. Optionally, the sensors set on each medical device sense the signal through the WIFI access point selected as the transfer device, and collect, transmit, store and process it.

[0024] Multiple gateway devices can sense and collect information from various medical devices in the wireless sensor network through the Internet of Things, and convert it into electrical signals, which are sent by the wireless network to a remote server.

[0025] The user terminal, client or management terminal manages and queries the medical equipment through the client interface. Optionally, when querying the medical equipment, the user terminal accesses the remote server, enters the query text, and queries the information of the hospital equipment.

[0026] The remote server provides a query interface for each device end. In the query interface, by constructing multiple different field information, microservice technology can be optionally used to provide various fields for different applications in the remote server, and then the various fields constitute views, and the various views constitute classified business objects. Users can form the required query service page information from the various objects as needed.

[0027] Optionally, the query page is formed by multiple objects in the server, and the generated query interface may include multiple query objects, and the query object may be multiple checkboxes for query information, such as equipment model, purchase year and month, user information, etc. The object information is freely called by the user terminal through the API interface to form self-combinable order demand information.

[0028] Map key fields according to input requirements. When a type view finally submits data, the keyword field is used as the keyword of JSONObject. The type view inherits getData, and the data obtained by the function is used as the value of JSONObject. Multiple JSONObjects constitute the data of a module, and multiple module data constitute the total business data submission.

[0029] In WEB development based on SpringMVC, the remote server is deployed and configured with the Spring framework; the client sends an HTTP request in the browser. After the remote server receives the HTTP request sent by the client, the dispatcher in the remote server receives the request, analyzes the HTTP request, and calls the processing control program to process the request. After the called processing control program processes the request, it returns the model and view name to the dispatcher. The model contains the attribute parameters that the processing control program wants to pass to the view for display. The attribute parameters are usually JSON format data.

[0030] When the dispatcher receives the model and view name, it will parse the logical view name into a view object and then present it. The dispatcher parses the view object from one or more view resolvers. The task of the view resolver is to return the view object according to the logical view name. The dispatcher obtains the view object returned by the view resolver, combines the model returned by the processing control program with the view object, and passes them to the view. The view is the data returned to the client. It is organized into JSON based on the obtained data and returned to the client browser. The view displays the final result to the user and presents it to the client interface.

[0031] Among them, optionally, the information input in the remote server can sense the RFID electronic tag on the medical device through the RFID reader; an RFID electronic tag is installed on each medical device, and the electronic tag information is associated with all the information mapping of the device, and the coding information of the RFID tag is used as the identity of the medical device. The intermediate device is used as a wireless access point, and can be optionally installed at the stairwell, corridor, middle area of ​​each department or ward of the hospital. The RFID electronic tag on the medical device can continuously emit wireless radio frequency signals. When these wireless access points can sense the wireless signal, the sensed information and location of the medical device with the RFID electronic tag will be transmitted to the information sending unit; the information sending unit can include a set WIFI access point, and the information sending unit sends the information to the remote server. The sending of information can be to send the sensed information to the remote server through an existing communication network. The optional existing communication network includes a wired network and a wireless WIFI network.

[0032] If there is a hospital LAN network interface near the information sending unit, standard Ethernet can also be used for data transmission; when there is no hospital LAN network interface near the information sending unit, wireless network can also be used for data transmission. When the information sending unit or the terminal manager selects wireless network transmission, the system will automatically retrieve the nearest WIFI access point and connect to the WIFI access point for data transmission. The transmission and access information of the medical device is obtained, and its access location information is displayed on the map information, thereby locating the information of the terminal device.

[0033] Exemplarily, the equipment of the hospital is usually fixed in the department. Through the connection of the Internet of Things device, the data of each device accessing WIFI is obtained, the information of the access point of WIFI is obtained, the access point is associated with the Internet of Things device, and the access log information of the WIFI access point is stored in the remote server. When the user queries the terminal device management information, the location information related to the query keyword is automatically introduced when querying the information. When the user searches for the corresponding device, the identification information of the medical device can be obtained by whether there is access record information and clock time information. Optionally, in the access log information, the identification information of the medical device is set to be displayed as active or in stock. Further, when the user device queries, the query is preferentially performed according to the active access log information cache information. The query cache information can be set to a first-level or second-level cache. Optionally, the search keyword string (a, b, c) is compared with the existing string in the first-level cache to determine whether there is an existing string in the first-level cache that is a prefix subset of the input search string. If there is no existing string in the first-level cache that is a prefix subset of the input search string, the first-level cache is not updated. If there is an existing character string in the first-level cache that is a prefix subset of the input search character string, the existing character string is deleted from the first-level cache, and the input search character string is added to the first-level cache.

[0034] The search string (a, b, c) is successfully queried in the L2 cache, and the L1 cache includes the following existing strings: (a, b), (c, d), (e, f, h). Since (a, b) is a prefix subset of (a, b, c), (a, b) in the L1 cache is deleted, and (a, b, c) is added to the L1 cache. By updating the L1 cache for different number information, the hit rate of the input search number or keyword in the L1 cache and L2 cache can be further improved, and the search logic can be further optimized.

[0035] Optionally, the search string stored in the first-level cache can be the most recently successfully queried search string, or the most recently frequently queried search string by the user. In specific implementation, the type, maximum number, maximum cache time, etc. of the search string in the first-level cache are set; the maximum number of search strings in the first-level cache is set to 4, and the maximum cache time is set to 8 minutes; the maximum number of search strings in the first-level cache is set to 25, and the maximum cache time is set to 2 minutes.

[0036] When the medical device chooses to access the WIFI access point, the WIFI access point records the access IP address and clock information of the medical device; the clock and IP address information are sent to a remote server; the remote server stores the location information of the WIFI access point, and the location information of the WIFI access point is mapped and associated with the location information of the hospital map;

[0037] When the user terminal accesses the information of the medical device through a query request, the WIFI connection point information of the medical device is obtained as an information index, the management information of the medical device is comprehensively obtained, and the associated WIFI access point information of the medical device is displayed on the map layer of the map hospital; the information index includes at least: the access IP address and the latest clock information of the medical device recorded by the WIFI access point.

[0038] The information of the WIFI access point is preset in the remote server. Through the interaction information of the access point and the identification information of the medical device RFID, it is possible to know whether there is access interaction and the mobile information of the medical device, thereby narrowing the scope of the query search device. By querying the associated WIFI device information, that is, through the fixed location information of the Wifi access point, the positioning information of the medical device is obtained. This avoids the existing method of obtaining medical device information by sending positioning through RFID radio frequency.

[0039] Optionally, the map information of the actual application hospital and the equipment settings of the WIFI access point can be repaired and maintained in the field of network management, that is, the management and maintenance of the WIFI equipment has a maintenance log. Therefore, by updating and replacing the access information and time information of the medical equipment, the log information of the database will not be increased, and the address index information such as MAC can be quickly obtained. The above address information index is unique. For this reason, when the user queries in the search interface, the log information of the WIFI access point is directly obtained, which is the first search range. The search query is performed to obtain the associated access point associated information, which reduces the search range.

[0040] When executing the query information, the user terminal optionally obtains the RFID number information of the search object related to the application and / or the content attributes of the search object from the network based on the application installed on the terminal device; the remote server extracts keywords from the content attributes and classifies and counts them to obtain keyword classification attributes, and combines the website access information accessed by the terminal device at the most recent moment to correspond the keywords to the nearest WiFi access point associated with the searched medical device object, and displays the hit WIFI access point information on the map. Each keyword of the optional associated device information can correspond to the network information address of at least one search object, and the network information address can be a MAC address or subnet IP address information.

[0041] Optionally, when a user enters a search term for query, the server matches the search term entered by the user in the keyword library, and provides the excerpt information of the search object corresponding to the matched keyword and the network information address to the user terminal; the remote server creates a linked list for each search object, and is used to store the relevant parameters of each search object in the node of the linked list; the relevant parameters of each search object include keywords, network information addresses and associated attribute information, etc.;

[0042] Optionally, the keywords stored in the linked list may be classified according to their meanings, and the access point information of the device and the last access time association information may be used as auxiliary information. The user's RFID number may be used as an index, and the RFID number may be a string of numbers to retrieve the corresponding information to be displayed in the remote server.

[0043] Optionally, when the user inputs a search text, data transformation is performed on the search text input by the user to generate multiple candidate phrases, where the candidate phrases refer to suffixes that form real semantics with the search text; and the probability of each candidate phrase becoming the next phrase of the search text is calculated respectively.

[0044] According to the probability of becoming the next phrase of the search text, a candidate suffix is ​​selected from the multiple candidate phrases, and the candidate suffix refers to a candidate phrase with a probability higher than a preset probability; a search term is generated according to the candidate phrase and the candidate suffix; a search is performed according to the search term, and a search result is generated and output. The search results are obtained by using the text information input by the device, and the WIFI information of the nearest access point associated with the device information of the corresponding keyword is displayed on the device side of the user terminal. The latest access point information is added to the retrieval of the user WIFI segment, so as to realize the location information of the nearest department of the user device, thereby improving the management and use efficiency of the device. For example, when the user queries a mobile B-ultrasound device, the access information of the B-ultrasound device is directly used as an auxiliary, and the mobile track information of the mobile device can be obtained according to the mobile information of the device's access log, and displayed in the display graph of the hospital's WiFI access point.

[0045] The device location-based medical device management in this method makes full use of the management information to automatically obtain network signals and addressing processes. The server records the WIFI hotspot access information of the device management device and the hospital network map information, deduplicates and locates the user's access information, and implements management query of medical device information, thereby improving the efficiency of device query. The query method replaces the query of medical device management with the query of WIFI device hotspots, reducing the amount of query information.

[0046] Optionally, the WIFI access point can be located at the transport layer as an access gateway, responsible for communication access with the management platform and the perception node, i.e., the terminal management device. The real-time monitoring feature of the working status of each terminal is to assign a manageable address, such as an IP address, to each managed terminal device to implement network communication security settings, load and balancing control of each communication channel in different time periods, reliability verification of IoT information during operation, fault detection and diagnostic logs, and other functions. In the access information of the network management device, access clock information is introduced for query to ensure deduplication and positioning of the managed medical equipment, and to record the accessed clock information. Therefore, the time information of the wireless access point needs to be synchronized.

[0047] In order to achieve the synchronization of time access time information and ensure the conflict and error of time information of each WIFI access point, it is necessary to synchronize the clock of each WIFI access point, and synchronize the clock between the subnet positioning monitoring and management devices (i.e., each WIFI access point) in the subnet: the subnet master node regularly broadcasts the local clock information to other subnet WIFI access nodes in the subnet. The information of other subnet WIFI access nodes can be stored only in the subnet master node, and the clock distance adjustment information of each other subnet WIFI access node is added to the broadcast packet sent by it, so as to facilitate the adjustment of the synchronization clock deviation of other subnet WIFI access nodes. Other subnet WIFI access nodes listen to the clock synchronization information of the master node, and adjust the deviation of the latest received clock information according to the known physical distance between themselves and the current subnet master node, so that all positioning monitoring nodes in the same subnet have a synchronized clock.

[0048] The MAC address of the target medical device to be located is entered into the remote server and broadcast to all positioning monitoring nodes in the Wi-Fi Internet of Things through subnets at all levels. The positioning monitoring node maintains a MAC address table of the target device to be located locally and regularly updates the list through the subnet master node.

[0049] Optionally, a subnet has only one WIFI access point, i.e., the master node, which serves as a subnet gateway. One gateway can manage multiple controllers. A controller controls multiple passive RFID readers or smart devices through wired connections; a passive RFID reader controls multiple single antennas and array antennas, sensors, and sound and light devices through a reader / writer module. In this way, a background management system in the server controls multiple subnet gateways, a subnet gateway controls multiple controllers, a controller controls multiple readers / smart devices, and a reader controls multiple antennas and sensors, forming an IoT system that can be infinitely expanded but can be limitedly managed step by step.

[0050] Optionally, when many readers / intelligent devices support Ethernet communication and standard command control mode, these passive RFID readers and intelligent devices can be directly connected to the subnet gateway without accessing the subnet gateway through the controller or other edge middleware, and the subnet gateway controls them through commands.

[0051] Based on the examples described above, in one embodiment, the features involving the method steps can be implemented by a computer device / or system provided by the present invention, wherein the computer device / system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, any one of the methods in the above embodiments is implemented.

[0052] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. For example, in the embodiment of the present invention, the program can be stored in a storage medium of a computer system and executed by at least one processor in the computer system to implement the processes including the embodiments of the above-mentioned video playback methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0053] Accordingly, a storage medium is also provided, on which a computer program is stored, wherein when the program is executed by a processor, any of the method steps involved in the above embodiments are implemented.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A medical equipment management system based on equipment positioning; characterized in that: The system includes a WIFI access point, a user terminal, a medical device and a remote server; the WIFI access point exchanges access information with the medical device and stores the access information, wherein each medical device is provided with a sensor for sensing signals, and the WIFI access point collects, transmits, stores and processes the sensed signals; The medical device is provided with an RFID electronic tag for identifying the ID information of the medical device; the wireless radio frequency signal of the medical device is sensed by the WIFI access point, and when the medical device chooses to access the WIFI access point, the WIFI access point records the access IP address and clock information of the medical device; the clock and IP address information are sent to a remote server; the remote server stores the location information of the WIFI access point, and the location information of the WIFI access point is mapped and associated with the location information of the hospital map; When the user terminal accesses the information of the medical device through a query request, the WIFI connection point information of the medical device is obtained as an information index, the management information of the medical device is comprehensively obtained, and the associated WIFI access point information of the medical device is displayed on the map layer of the map hospital; the information index at least includes: the access IP address and the latest clock information of the medical device recorded by the WIFI access point; wherein, when the user terminal queries the information of the medical device, the location information associated with the query keyword is automatically introduced; The user terminal communicates with the remote server and generates a query request interface, including: the remote server provides a query interface for each user device, constructs a plurality of different field information, forms a view from each field, forms a classified business object from each view, and forms a query request interface with each composed object; The remote server extracts keywords from the content attributes of the query information, selects candidate suffixes from a plurality of candidate phrases according to the probability of becoming the next phrase of the content of the query information, wherein the candidate suffix refers to a candidate phrase with a probability higher than a preset probability; generates a search term according to the candidate phrase and the candidate suffix; The remote server is provided with a first-level cache and a second-level cache, and the search keyword string obtained from the query request is compared with the existing string in the first-level cache to determine whether there is an existing string in the first-level cache that is a prefix subset of the input search keyword string.

2. The system of claim 1, further characterized in that: The ID information is obtained from the encoding information of the RFID tag on the medical device.

3. The system according to claim 2, characterized in that: The remote server sets one of the multiple WIFI access points as a gateway device, and the gateway device allocates a manageable address to each managed terminal device, and monitors the load balance of each communication channel in different time periods.

4. The system according to claim 3, characterized in that: The clock information and MAC information of the medical device included in the access information are used for deduplication and positioning processing. The remote server records the accessed clock information; the gateway device synchronizes the clock information of the WIFI wireless access point in the subnet.

5. A system according to any one of claims 1 to 4, characterized in that: The network where the system is located includes multiple subnets, each subnet has only one WIFI access point as a subnet gateway device, and one gateway manages multiple controllers; one controller controls multiple passive RFID readers or smart devices through wired connections; one passive RFID reader controls multiple single antennas and array antennas, sensors, and sound and light devices through a reading and writing module.

6. The system according to claim 5, characterized in that: The gateway device stores the information of the subnet WIFI access node, and when sending a broadcast packet to the subnet WIFI access point, adds the clock distance adjustment information of each other subnet WIFI access node in the broadcast packet, so as to be used for adjusting the synchronization clock deviation of other subnet WIFI access nodes.

Citation Information

Patent Citations

  • Remote medical service system using WLAN (Wireless Local Area Network) standard and method thereof

    CN101808125A

  • Determining method for searching headword and device of searching headword, searching method and searching equipment

    CN103123632A

  • Personnel positioning system and method based on campus wireless network

    CN112788127A