CN108966369B - System and method for positioning and monitoring personnel in nursing home - Google Patents
System and method for positioning and monitoring personnel in nursing home Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/021—Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
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- H04W4/33—Services specially adapted for particular environments, situations or purposes for indoor environments, e.g. buildings
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Abstract
The invention relates to a positioning and monitoring system and a method thereof for personnel in a nursing home, which are designed for solving the technical problems of higher requirement on signal strength value and inaccurate positioning of the existing similar method and system. The key point is that the method of the system is as follows: firstly, allocating equipment with a basic communication function on personnel and/or materials of a nursing home as an unknown node, and obtaining an estimated distance between a wireless network node and the unknown node based on a wireless network sensor and an RSSI (received signal strength indicator) ranging technology; and then, the neighbor nodes of the unknown nodes are optimized, and the anchor nodes with high reliability are selected to position the unknown nodes by using a mean square deviation method, so that the positioning accuracy of the unknown nodes is improved. The wireless network sensor of the system comprises a panel cover, a battery, a circuit board and a box body, wherein the panel cover is provided with a wireless transmitting and receiving antenna, a display control panel and a safety indicator lamp, and the circuit board is provided with a positioning module, a pressure sensor, a power management module and an RFID identification tag.
Description
Technical Field
The invention relates to a positioning method of wireless technology, in particular to a system and a method for positioning and monitoring personnel in an aged care hospital.
Background
Nowadays, the demand of indoor positioning technology is higher and higher, and indoor positioning in various large places has become a standard configuration. Such as application number 201710744017.1 disclosed in chinese patent document, application publication date 2018.01.30, entitled "indoor positioning system"; the system comprises: a plurality of positioning anchor points periodically send self ID information through encrypted/non-encrypted broadcast frames; the positioning label is arranged on a target to be positioned, scans and receives ID information of a plurality of positioning anchor points and signal strength RSSI values corresponding to the positioning anchor points, and sends the ID information and the RSSI values in a wireless mode; the positioning gateway receives and sends the information sent by the positioning label wirelessly; the positioning server receives ID information, signal strength RSSI values and self IDs of the positioning labels of a plurality of positioning anchors sent by the positioning gateway, inquires the position information of the corresponding positioning anchors according to the received ID information of the positioning anchors, calculates the distance value between the positioning labels and each positioning anchor according to the received signal strength RSSI values, and then obtains the position information of the positioning labels indoors through a positioning algorithm. Although the technology adopts the wireless network sensor and the RSSI ranging technology to position the unknown node, the node can be adopted only when the signal intensity of the node reaches the standard, and the node for measurement is not optimized, so that certain influence is generated on the measurement precision. Meanwhile, as an indispensable part of the human society, the nursing home also realizes intelligent and humanized management on the management of materials and personnel through an indoor positioning technology, and the prior art is less applied to the nursing home.
Disclosure of Invention
In order to overcome the above disadvantages, the present invention provides a system and a method for positioning and monitoring personnel in an endowment department, so as to solve the technical problems of poor positioning effect, low intelligence degree, inconvenient positioning of personnel and materials, and poor structural design of a wireless network sensor applied to positioning in an endowment department of the existing similar products. The purpose is realized by the following technical scheme.
A personnel positioning and monitoring system for an aged nursing home comprises an unknown node and an anchor node, wherein the unknown node is equipment with a basic communication function, and the anchor node is a wireless network sensor; the system is characterized in that the equipment with the basic communication function is assembled on personnel and/or material equipment in an old people home, a plurality of wireless network sensors are distributed in the old people home, and the wireless network sensors and the equipment with the basic communication function on the fixed material equipment are anchor nodes with high reliability.
The wireless network sensor includes the panel lid, a battery, a circuit board, a box body, the panel lid is equipped with wireless transmit-receive antenna, display control panel and safety indicator, be equipped with battery and circuit board in the casing of panel lid and box body lock, the circuit board is equipped with orientation module, pressure sensors, power management module, RFID identification label and RFID radio frequency identification ware, orientation module real time monitoring wireless network sensor's positional information, pressure sensors can sense the external force impact that wireless network sensor received, power management module can detect wireless network sensor's electric quantity at any time, the RFID identification label is used for wireless network sensor's discernment, RFID radio frequency identification ware is used for taking the equipment discernment of RFID identification label.
The bottom of the box body of the wireless network sensor is provided with a clamp body, and the tail of the clamp body extends out of the box body and is provided with a mounting hole. Therefore, the wireless network sensor can be conveniently installed on equipment or materials of the nursing home through the installation hole of the clamp body and clamped on the equipment or materials of the nursing home through the clamp body.
A decoration ring is arranged at the buckling position of the panel cover and the box body of the wireless network sensor, and an extended insertion plate end is arranged on one side of the decoration ring. Thereby facilitating the insertion of the wireless network sensor into the equipment or material gap of the nursing home.
According to the characteristics of the system, the method specifically comprises the following steps: firstly, allocating equipment with a basic communication function on personnel and/or materials of a nursing home as an unknown node, and obtaining an estimated distance between a wireless network node and the unknown node based on a wireless network sensor and an RSSI (received signal strength indicator) ranging technology; and then, the neighbor nodes of the unknown nodes are optimized, and the anchor nodes with high reliability are selected to position the unknown nodes by using a mean square deviation method, so that the positioning accuracy of the unknown nodes is improved.
The positioning method is feasible, the positioning result is accurate, the positioning is convenient and fast, and the application range is wide; it is suitable for positioning monitoring of personnel and/or material allocation of nursing homes and improvement of similar positioning methods.
Drawings
Fig. 1 is a block diagram of a detailed process for unknown node location in accordance with the present invention.
Fig. 2 is an exploded view of an embodiment of a wireless network sensor of the present invention.
Figure number and name: 1. panel lid, 2, dress circle, 3, battery, 4, circuit board, 5, box body, 6, clamp.
Detailed Description
The working principle of the present invention will now be further described with reference to the accompanying drawings. The system comprises an unknown node and an anchor node, wherein the unknown node is equipment with a basic communication function, and the anchor node is a wireless network sensor; the equipment of basic communication function assembles in the asylum for aged personnel and/or material equipment, and the asylum for aged has laid a plurality of wireless network sensors. As shown in fig. 2, the embodiment of the wireless network sensor, the wireless network sensor includes a panel cover 1, a battery 3, a circuit board 4, a box body 5, the panel cover is provided with a wireless transmitting and receiving antenna, a display control panel and a safety indicator, a battery and a circuit board are arranged in a shell of the panel cover and the box body, the circuit board is provided with a positioning module, a pressure sensor, a power management module, an RFID identification tag and an RFID radio frequency identifier, the positioning module monitors the position information of the wireless network sensor in real time, the pressure sensor can sense the external force impact on the wireless network sensor, the power management module can detect the electric quantity of the wireless network sensor at any time, the RFID identification tag is used for identifying the wireless network sensor, and the RFID radio frequency identifier is used for identifying equipment with the RFID identification tag. The bottom of the box body of the wireless network sensor is provided with a clamp body 6, and the tail part of the clamp body extends out of the box body and is provided with a mounting hole; a decorative ring 2 is arranged at the buckling position of a panel cover and a box body of the wireless network sensor, and one side of the decorative ring is provided with an extended inserting plate end. The wireless network sensor is inserted into the equipment or material gap of the nursing home through the insertion plate end of the decorative ring, and the wireless network sensor is installed on or clamped in the equipment or material gap of the nursing home through the clamp body. The goods or personnel passing through the wireless network sensor and provided with the RFID identification tag are identified by the RFID radio frequency identifier and uploaded to the server, and the wireless network sensor records the position information and the use state of each wireless network sensor through the RFID identification tag of the wireless network sensor.
As shown in fig. 1, the specific process is as follows:
s100: setting the unknown node of the personnel and/or material equipment of the nursing home as n1The set of n neighbor nodes deployed around the neighbor nodes in advance is B, and the nearest m neighbor nodes (n is less than m) are selected as the candidates of the optimization nodes based on the RSSI ranging distance according to actual requirements; selecting all possible subsets S of (n-m) nodes from the set B1The set of (c) is denoted S (n)-m), all possible subsets S of m nodes are selected from the set B2The set of (1) is denoted by S (m), i.e.
S200: assume that there are c anchor nodes (x) in the possible subset1，…，xc，y1，…，yc) Calculating an estimation matrix of unknown nodes, i.e.
Wherein i is a corresponding node corner mark, and the distance from an unknown node to a corresponding anchor node
Coefficient b ═ 10np/σdB)2Taking S100: setting the unknown node of the personnel and/or material equipment of the nursing home as n1The set of n neighbor nodes deployed around the neighbor nodes in advance is B, and the nearest m neighbor nodes (n is less than m) are selected as the candidates of the optimization nodes based on the RSSI ranging distance according to actual requirements; selecting all possible subsets S of (n-m) nodes from the set B1Is denoted as S (n-m), and all possible subsets S of m nodes are selected from the set B2The set of (1) is denoted by S (m), i.e.
S200: assume that there are c anchor nodes (x) in the possible subset1，…，xc，y1，…，yc) Calculating an estimation matrix of unknown nodes, i.e.
Wherein i is a corresponding node corner mark, and the distance from an unknown node to a corresponding anchor node
Coefficient b ═ 10np/σdB)2Taking σ dB/np＝1.7；
S300: from the estimated matrix of the unknown node, the minimum mean square deviation of all possible subsets in S (n-m) is calculated, i.e.
Wherein,
for the calculated estimated coordinates, (x)0，y0) The actual coordinate position of the unknown node is obtained;
s400: the node in the possible subset that minimizes the mean square deviation is chosen as the optimized subset S (n), i.e.
Set of S (n) is
And
wherein, bjThe nodes arranged from near to far away from the unknown node (b)1，…bj)，||n1-bjI is unknown node n1To node bjThe distance of (d);
s401: suppose that the optimized subset S (n) contains k nodes (x)1，…，xk，y1，…yk) (k is less than n), based on the RSSI ranging technology, the unknown node is measured by utilizing the optimized subset S (n) to obtain the coordinate (x) of the unknown node0，y0) To locate persons and/or material equipment in the nursing home, i.e.
Thereby realizing the accurate positioning of the personnel and/or the material equipment in the nursing home.
In conclusion, the system and the method select and optimize the nodes for measurement, so that indoor positioning with higher precision is realized, assistance is provided for personnel and material management of the nursing home, and intelligent and humanized management of the nursing home is realized. Compared with the traditional wireless network node positioning technology, the system and the method effectively increase the node positioning accuracy, and the positioning method requires low calculation difficulty; meanwhile, the personnel and/or material management of the nursing home at the present stage mostly adopts manpower management, and the system and the method thereof can greatly reduce the cost of the nursing home in the aspects of manpower and material resources.
Claims (1)
1. A method for positioning and monitoring a system for personnel in an aged nursing home comprises an unknown node and an anchor node, wherein the unknown node is equipment with a basic communication function, and the anchor node is a wireless network sensor; the equipment with the basic communication function is assembled on personnel and/or material equipment in the nursing home, a plurality of wireless network sensors are distributed in the nursing home, and the wireless network sensors and the equipment with the basic communication function on the material equipment are anchor nodes with high reliability; the method is characterized in that the personnel and/or materials in the nursing home are provided with equipment with a basic communication function as an unknown node, and the estimated distance between the wireless network node and the unknown node is obtained based on the wireless network sensor and the RSSI ranging technology; then, an anchor node with high reliability is selected to position the unknown node by optimizing neighbor nodes of the unknown node and utilizing a mean square deviation method, so that the positioning accuracy of the unknown node is improved;
the method comprises the following specific processes:
s100: setting the unknown node of the personnel and/or material equipment of the nursing home as n1The set of n neighbor nodes deployed around the neighbor nodes in advance is B, and the nearest m neighbor nodes (n is less than m) are selected as the candidates of the optimization nodes based on the RSSI ranging distance according to actual requirements; selecting all possible subsets S of (n-m) nodes from the set B1Is denoted as S (n-m), and all possible subsets S of m nodes are selected from the set B2The set of (1) is denoted by S (m), i.e.
S200: assume that there are c anchor nodes (x) in the possible subset1，…，xc，y1，…，yc) Calculating an estimation matrix of unknown nodes, i.e.
Wherein i is a corresponding node corner mark, and the distance from an unknown node to a corresponding anchor node
Coefficient b ═ 10np/σdB)2Taking σ dB/np＝1.7；
S300: from the estimated matrix of the unknown node, the minimum mean square deviation of all possible subsets in S (n-m) is calculated, i.e.
Wherein,
for the calculated estimated coordinates, (x)0，y0) The actual coordinate position of the unknown node is obtained;
s400: the node in the possible subset that minimizes the mean square deviation is chosen as the optimized subset S (n), i.e.
Set of S (n) is
And
wherein, bjThe nodes arranged from near to far away from the unknown node (b)1，…bj)，||n1-bjI is unknown node n1To node bjThe distance of (d);
s401: suppose that the optimized subset S (n) contains k nodes (x)1，…，xk，y1，…yk) (k is less than n), based on the RSSI ranging technology, the unknown node is measured by utilizing the optimized subset S (n) to obtain the coordinate (x) of the unknown node0，y0) To locate persons and/or material equipment in the nursing home, i.e.
Thereby realizing the accurate positioning of the personnel and/or the material equipment in the nursing home.
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