CN104507161A

CN104507161A - Indoor corridor positioning method based on zigbee network

Info

Publication number: CN104507161A
Application number: CN201410815786.2A
Authority: CN
Inventors: 高建彬; 樊添; 张可; 夏琦; 尹立雪; 夏虎
Original assignee: University of Electronic Science and Technology of China
Current assignee: University of Electronic Science and Technology of China
Priority date: 2014-12-24
Filing date: 2014-12-24
Publication date: 2015-04-08
Anticipated expiration: 2034-12-24
Also published as: CN104507161B

Abstract

The invention provides an indoor corridor positioning method based on a zigbee network, and belongs to the technical field of wireless communication. The characteristics of simple layout, low positioning loss and the like of a zigbee system are utilized for realizing the precise positioning of a mobile terminal to be positioned in a building. The method provided by the invention has the advantages that on the basis of positioning to the floor, the located position of the mobile terminal is precisely located through the distance between the mobile terminal and two routing nodes; the used zigbee network is simple in layout and is practical.

Description

A kind of indoor corridor localization method based on zigbee network

Technical field

The invention belongs to wireless communication technology field, be specifically related to a kind of method of by zigbee system, the user in building being carried out to accurately location.

Background technology

In the modern life, the activities such as people's work, amusement more and more concentrate in high buildings and large mansions.Floor structure is complicated, the number of plies is more and more higher, when during user is for the high-rise indoor environment of these complexity, if can not find the direction board of oneself position fast, just wishes floor and the place particular location of being determined oneself by position application.

The general pooled applications of indoor positioning of building is in business, safety measure.As in market, the display research of different floor kinds of goods, when user is in different floors, analyzes its behavioural habits, thus determines user preferences, and utilizes mobile terminal to push promotional advertisement, improves consumer's purchase experiences greatly; Or in high-rise building, during the emergencies such as breaking out of fire, by hand held mobile terminals, three-dimensional accurately location is carried out to escape personnel, improve escape chance.Although be positioned at specific scene and field active demand in high building, it is the direction of the less concern of researcher.

Traditional outdoor positioning mode, such as GPS location, in indoor because signal shielding problem is difficult to play a role, applying more in indoor positioning mode is wifi hotspot location technology, utilize wifi network to be distributed in each position of high building to position, but there is some problems in the location of this mode: be first that wifi hotspot price is higher, be difficult to large scale deployment; Next is that wifi adapter power consumption on wifi hotspot and locating terminal is handed over large, is difficult to provide positioning service for a long time under powered battery condition.And utilize Zigbee-technology to carry out indoor positioning, there is low-power consumption, reliable communications, self-organization of network ability is strong, time delay is short, working frequency range is flexible, network capacity is large advantage.

Summary of the invention

The object of the present invention is to provide a kind of indoor corridor localization method, realize user when the floor gap of indoor is walked about, utilize mobile terminal immediately to push to user the accurate location that it is in a certain corridor in a certain floor in building; Localization method provided by the invention is implemented simple, cheap, and layout is convenient.

The present invention specifically adopts following technical scheme:

Based on an indoor corridor localization method for zigbee network, its flow process as shown in Figure 1, specifically comprises the following steps:

Step 1.zigbee route terminal layout: for the structure situation of existing building, does following supposition without loss of generality to the floor layout of building: in (1) building, the corridor of every floor is all consistent with body of wall layout; (2) any corridor is linear pattern;

Based on above-mentioned supposition, the zigbee route terminal of fixed and arranged more than 2 on each corridor, and in building, the zigbee route terminal layout of each floor is all identical; Coordinate information such as residing floor and the concrete corridor of each zigbee route terminal are given data;

Step 2.RSSI data collection: after the zigbee network in mobile terminal access building to be positioned, mobile terminal is collected RSSI strength information that the zigbee route terminal near it sends and is gathered by the RSSI that all zigbee route terminals send;

Step 3. floor location: the RSSI signal strength signal intensity sent due to zigbee route terminal has obvious loss after by body of wall or other barriers, certain and the mobile terminal of the zigbee route terminal corresponding to maximum in the RSSI that known mobile terminal gathers is in the same corridor of same floor, by transferring the coordinate information of this zigbee route terminal, the floor residing for this mobile terminal and concrete corridor can be learnt;

Step 4. corridor radial location: after the concrete floor determining mobile terminal and residing corridor, extracts the RSSI being positioned at the mobile terminal to be positioned that any two the zigbee route terminals on this corridor collect; Because the zigbee route terminal on mobile terminal and residing corridor is unobstructed direct communication, therefore try to achieve the distance between mobile terminal and described two zigbee route terminals by RSSI;

Respectively with described two zigbee route terminal positions be the center of circle, the distance of corresponding route terminal and mobile terminal to be positioned obtains two crossing or tangent balls for radius; If two balls are tangent, then the position be projected on the corridor floor of place, point of contact is the particular location of described mobile terminal in corridor; If two balls intersect, then its intersection is a circle, and described circular place plane is vertical with flooring, and this circular projection to the position on this corridor floor is the concrete radial position of described mobile terminal on corridor.

Further, described mobile terminal can be arranged in the movable equipment such as shopping cart, hand-held pushing equipment that market provides, for user, staff etc. provide instant coordinate information.

The invention has the beneficial effects as follows:

Zigbee system layout is convenient and simple, and navigation system power consumption is little, and this localization method is suitable for carrying out indoor positioning at various baroque high buildings and large mansions, and the impact being subject to inside buildings structure is less, and positional accuracy is relatively high; It is worth mentioning that, floor location directly takes into account by localization method provided by the invention, solves indoor plane simultaneously and accurately locates and accurately locate two problems with indoor floor.

Accompanying drawing explanation

Fig. 1 is indoor corridor localization method flow chart provided by the invention.

Embodiment

Below in conjunction with embodiment, the invention will be further described.

Embodiment

The present embodiment setting building is high-rise store, and in store, the corridor of every floor is all consistent with body of wall layout and any corridor is linear pattern, for the shopping cart that client provides being provided with location mobile terminal and phonetic image prompt facility.

The present embodiment provide based on zigbee network indoor corridor localization method, specifically comprise the following steps:

Step 1.zigbee route terminal layout: the zigbee route terminal of fixed and arranged more than 2 on each corridor, the optional position of namely guaranteeing each corridor all at least can realize unobstructed direct communication with 2 zigbee route terminals, and on same corridor, the spacing of adjacent route terminal is no more than 70 meters; And the zigbee route terminal layout of each floor is all identical in store, the coordinate information of each zigbee route terminal is given data and is stored in route terminal;

Step 2. data collection: after the zigbee network in mobile terminal access store to be positioned, the signal strength signal intensity that mobile terminal that zigbee route terminal is received it by own hardware transducer sends is converted into corresponding numerical value, and together packs in conjunction with self coordinate and the network address and beam back mobile terminal; Mobile terminal is collected RSSI strength information that the zigbee route terminal near it sends and is gathered by the RSSI that all zigbee route terminals send;

Step 3. floor location: the RSSI signal strength signal intensity sent due to zigbee route terminal has obvious loss after by body of wall or other barriers, the zigbee route terminal corresponding to maximum in the RSSI that known mobile terminal gathers is certain to be in the same corridor of same floor with this mobile terminal, then described mobile terminal can learn floor residing for this mobile terminal and concrete corridor by the coordinate information transferring the maximum zigbee route terminal of RSSI value;

Step 4. corridor radial location: after the concrete floor determining mobile terminal and residing corridor, this mobile terminal extracts the RSSI being positioned at the mobile terminal to be positioned that any two the zigbee route terminals on this corridor collect; Because the zigbee route terminal on mobile terminal and residing corridor is unobstructed direct communication, therefore distance d between mobile terminal and described two zigbee route terminals can be tried to achieve by following formula:

d = 10^{\frac{RSSI + A}{10 n}}

Wherein, the received signal strength that A is this route terminal to reference node when being 1 meter of distance, n is signal path fissipation factor and spread index;

Respectively with described two zigbee route terminal positions be the center of circle, the distance of corresponding route terminal and mobile terminal to be positioned obtains two crossing or tangent balls for radius;

If two balls are tangent, then the position be projected on the corridor floor of place, point of contact is the particular location of described mobile terminal in corridor; If two balls intersect, then its intersection is a circle, and described circular place plane is vertical with flooring, and this circular projection to the position on this corridor floor of place is the particular location of described mobile terminal in described corridor radial direction.

Thus, finally realize the floor of mobile terminal in building and the accurate location of corridor plane, and instant locating information is pushed to client or staff by phonetic image prompt facility.

Claims

1., based on an indoor corridor localization method for zigbee network, specifically comprise the following steps:

Step 1.zigbee route terminal layout: the zigbee route terminal of fixed and arranged more than 2 on each corridor, and in building, the zigbee route terminal layout of each floor is all identical; The coordinate information of each zigbee route terminal is given data;

Step 3. floor location: the zigbee route terminal corresponding to the maximum in the RSSI that mobile terminal gathers is certain to be in the same corridor of same floor with mobile terminal, can learn floor residing for this mobile terminal and concrete corridor by the coordinate information transferring this zigbee route terminal;

Step 4. corridor radial location: after the concrete floor determining mobile terminal and residing corridor, extracts the RSSI being positioned at the mobile terminal to be positioned that any two the zigbee route terminals on this corridor collect; Because the zigbee route terminal on mobile terminal and residing corridor is unobstructed direct communication, try to achieve the distance between mobile terminal and described two zigbee route terminals by RSSI; Respectively with described two zigbee route terminal positions be the center of circle, the distance of corresponding route terminal and mobile terminal to be positioned obtains two crossing or tangent balls for radius; If two balls are tangent, then the position be projected on the corridor floor of place, point of contact is the particular location of described mobile terminal in corridor; If two balls intersect, then its intersection is a circle, and described circular place plane is vertical with flooring, and this circular projection to the position on this corridor floor is the concrete radial position of described mobile terminal on corridor.

2. the indoor corridor localization method based on zigbee network according to claim 1, is characterized in that, mobile terminal described in step 4 and the distance d between zigbee route terminal are specifically determined by following formula:

{d = 10}^{- \frac{RSSI + A}{10 n}}

Wherein, the received signal strength that A is this route terminal to reference node when being 1 meter of distance, n is signal path fissipation factor and spread index.