CN104507161B - A kind of indoor corridor localization method based on zigbee network - Google Patents

Abstract

The invention provides a zigbee network-based indoor corridor positioning method, which belongs to the technical field of wireless communication. The present invention utilizes the characteristics of simple layout and low positioning loss of the zigbee system to realize accurate positioning of the mobile terminal to be positioned in a building. The method provided by the invention accurately locates the location of the mobile terminal through the distance between the mobile terminal and two routing nodes on the basis of locating the floor; the layout of the zigbee network used in the invention is simple and practical.

Description

A positioning method for indoor corridors based on zigbee network

technical field

The invention belongs to the technical field of wireless communication, and in particular relates to a method for accurately locating users in a building through a zigbee system.

Background technique

In modern life, people's work, entertainment and other activities are more and more concentrated in high-rise buildings. The floor structure is complex and the number of floors is getting higher and higher. When the user is in these complex high-rise indoor environments, if he cannot quickly find the sign of his location, he hopes to determine his floor and specific location through the positioning application.

Indoor positioning of buildings is generally concentrated in commercial and security measures. For example, in shopping malls, research on the display of goods on different floors, when users are on different floors, analyze their behavior habits, so as to determine user preferences, and use mobile terminals to push promotional advertisements, greatly improving consumer shopping experience; or In high-rise buildings, when an emergency such as a fire occurs, the three-dimensional precise positioning of the escaped personnel is carried out through the handheld mobile terminal to improve the chance of escape. Although positioning in tall buildings is urgently needed in specific scenarios and fields, it is a direction that researchers pay less attention to.

Traditional outdoor positioning methods, such as GPS positioning, are difficult to function indoors due to the problem of signal shielding. In indoor positioning methods, wifi wireless hotspot positioning technology is widely used, which uses wifi networks to distribute in various locations of high-rise buildings for positioning. However, this There are certain problems in the positioning of the method: first, the high price of wifi hotspots makes it difficult to deploy on a large scale; secondly, the power consumption of the wifi adapters on the wifi hotspots and positioning terminals is too high, making it difficult to provide positioning services for a long time under battery power conditions. Using zigbee technology for indoor positioning has the advantages of low power consumption, reliable communication, strong network self-organization ability, short delay, flexible working frequency band, and large network capacity.

Contents of the invention

The purpose of the present invention is to provide a method for positioning indoor corridors, which enables users to instantly push the exact location of a certain corridor in a certain floor of a building to the user by using a mobile terminal when the user walks between floors in the room; the present invention provides The positioning method is simple to implement, low in cost, and convenient in layout.

The present invention specifically adopts the following technical solutions:

A zigbee network-based indoor corridor positioning method, its process as shown in Figure 1, specifically includes the following steps:

Step 1. Zigbee routing terminal layout: According to the structure of the existing building, the floor layout of the building is assumed as follows without loss of generality: (1) The corridor and wall layout of each floor in the building are consistent; (2) Any one of the corridors is straight;

Based on the above assumptions, more than two zigbee routing terminals are fixedly arranged on each corridor, and the layout of the zigbee routing terminals on each floor in the building is the same; the coordinate information of each zigbee routing terminal, such as the floor and the specific corridor, is known data;

Step 2. RSSI data collection: After the mobile terminal to be positioned accesses the zigbee network in the building, the mobile terminal collects the RSSI strength information sent by the nearby zigbee routing terminals and summarizes the RSSIs sent by all zigbee routing terminals;

Step 3. Floor positioning: Since the RSSI signal strength sent by the zigbee routing terminal will be significantly lost after passing through walls or other obstacles, it can be seen that the zigbee routing terminal corresponding to the maximum value of the RSSI summarized by the mobile terminal must be the same as the mobile terminal In the same corridor on the same floor, the floor and specific corridor where the mobile terminal is located can be known by calling the coordinate information of the zigbee routing terminal;

Step 4. Corridor radial positioning: After determining the specific floor of the mobile terminal and the corridor where it is located, extract the RSSI of the mobile terminal to be positioned collected by any two zigbee routing terminals located on the corridor; The zigbee routing terminals on the network are unobstructed direct communication, so the distance between the mobile terminal and the two zigbee routing terminals can be obtained by RSSI;

Take the positions of the two zigbee routing terminals as the center of the circle, and the distance between the corresponding routing terminal and the mobile terminal to be positioned as the radius to obtain two intersecting or tangent balls; if the two balls are tangent, the tangent point is projected to the corridor floor The position above is the specific position of the mobile terminal in the corridor; if the two spheres intersect, the line of intersection is a circle, the plane where the circle is located is perpendicular to the floor, and the circle is projected onto the floor of the corridor The position of is the specific radial position of the mobile terminal on the corridor.

Further, the mobile terminal can be set in a shopping cart provided by a shopping mall, a handheld push device and other mobile devices to provide users, staff, etc. with real-time coordinate information.

The beneficial effects of the present invention are:

The layout of zigbee system is convenient and simple, the power consumption of the positioning system is small, and this positioning method is suitable for indoor positioning in various high-rise buildings with complex structures. It is less affected by the internal structure of the building and the positioning accuracy is relatively high; it is worth mentioning Yes, the positioning method provided by the present invention directly takes floor positioning into consideration, and simultaneously solves the two problems of accurate positioning of indoor planes and accurate positioning of indoor floors.

Description of drawings

Fig. 1 is a flow chart of the indoor corridor positioning method provided by the present invention.

Detailed ways

The present invention will be further described below in conjunction with embodiment.

Example

In this embodiment, the building is set as a high-rise shopping mall. The corridors and wall layouts of each floor in the mall are consistent and any corridor is linear. The shopping carts provided to customers are equipped with mobile terminals and voice images for positioning. Prompt device.

The zigbee network-based indoor corridor positioning method provided in this embodiment specifically includes the following steps:

Step 1. Zigbee routing terminal layout: fixedly arrange more than 2 zigbee routing terminals on each corridor, that is, ensure that any position of each corridor can realize unobstructed direct communication with at least 2 zigbee routing terminals, and the same corridor The distance between adjacent routing terminals on the top is not more than 70 meters; and the layout of the zigbee routing terminals on each floor in the mall is the same, and the coordinate information of each zigbee routing terminal is known data and stored in the routing terminal;

Step 2. Data collection: After the mobile terminal to be positioned is connected to the zigbee network in the shopping mall, the zigbee routing terminal converts the signal strength received by the mobile terminal into a corresponding value through its own hardware sensor, and combines its own coordinates and The network address is packaged and sent back to the mobile terminal; the mobile terminal collects the RSSI strength information sent by the nearby zigbee routing terminals and summarizes the RSSI sent by all zigbee routing terminals;

Step 3. Floor positioning: Since the RSSI signal strength sent by the zigbee routing terminal will be significantly lost after passing through walls or other obstacles, it can be known that the zigbee routing terminal corresponding to the maximum value of the RSSI summarized by the mobile terminal must be the same as the mobile terminal. The terminal is in the same corridor on the same floor, then the mobile terminal can know the floor and the specific corridor where the mobile terminal is located by calling the coordinate information of the zigbee routing terminal with the largest RSSI value;

Step 4. Corridor radial positioning: After determining the specific floor of the mobile terminal and the corridor where it is located, the mobile terminal extracts the RSSI of the mobile terminal to be positioned collected by any two zigbee routing terminals located on the corridor; The zigbee routing terminal on the corridor is unobstructed direct communication, so the distance d between the mobile terminal and the two zigbee routing terminals can be obtained by the following formula:

Among them, A is the received signal strength when the distance from the routing terminal to the reference node is 1 meter, and n is the signal path loss factor, that is, the propagation index;

Take the positions of the two zigbee routing terminals as the center of the circle, and the distance between the corresponding routing terminal and the mobile terminal to be positioned as the radius to obtain two intersecting or tangent balls;

If the two spheres are tangent, the projected position of the tangent point on the floor of the corridor is the specific position of the mobile terminal in the corridor; if the two spheres intersect, the line of intersection is a circle, and the plane where the circle is located Vertical to the floor, the position where the circle is projected onto the floor of the corridor is the specific position of the mobile terminal in the radial direction of the corridor.

Thus, the accurate positioning of the mobile terminal on the floor and corridor plane in the building is finally realized, and the real-time positioning information is pushed to the customer or staff through the voice and image prompting device.

Claims (2)

1. A zigbee network-based indoor corridor positioning method, specifically comprising the following steps: Step 1. Zigbee routing terminal layout: fixedly arrange more than 2 zigbee routing terminals on each corridor, and the layout of the zigbee routing terminals on each floor in the building is the same; the coordinate information of each zigbee routing terminal is known data ; Step 2. RSSI data collection: After the mobile terminal to be positioned accesses the zigbee network in the building, the mobile terminal collects the RSSI strength information sent by the nearby zigbee routing terminals and summarizes the RSSIs sent by all zigbee routing terminals; Step 3. Floor positioning: Since the zigbee routing terminal corresponding to the maximum value of the RSSI summarized by the mobile terminal must be in the same corridor on the same floor as the mobile terminal, the coordinate information of the zigbee routing terminal can be known by calling the coordinate information of the zigbee routing terminal. The floor where the mobile terminal is located and the specific corridor; Step 4. Corridor radial positioning: After determining the specific floor of the mobile terminal and the corridor where it is located, extract the RSSI of the mobile terminal to be positioned collected by any two zigbee routing terminals located on the corridor; The zigbee routing terminal on the network is an unobstructed direct communication, and the distance between the mobile terminal and the two zigbee routing terminals can be obtained through RSSI; the positions of the two zigbee routing terminals are respectively the center of the circle, and the corresponding routing terminal and The distance of the mobile terminal to be positioned is the radius of two intersecting or tangent balls; if the two balls are tangent, the position where the tangent point is projected onto the floor of the corridor where it is located is the specific position of the mobile terminal in the corridor; If the spheres intersect, the line of intersection is a circle, and the plane where the circle is located is perpendicular to the floor, and the position of the circle projected onto the floor of the corridor is the specific radial position of the mobile terminal on the corridor. 2. the indoor corridor positioning method based on zigbee network according to claim 1, is characterized in that, the distance d between mobile terminal described in step 4 and zigbee routing terminal is specifically determined by the following formula: <msup><mrow><mi>d</mi><mo>=</mo><mn>10</mn></mrow><mrow><mo>-</mo><mfrac><mrow><mi>RSSI</mi><mo>+</mo><mi>A</mi></mrow><mrow><mn>10</mn><mi>n</mi></mrow></mfrac></mrow></msup> Among them, A is the received signal strength when the distance from the routing terminal to the reference node is 1 meter, and n is the signal path loss factor, that is, the propagation index.