CN103235283B - Bluetooth-based motion trend determination method - Google Patents

Abstract

The invention discloses a Bluetooth-based motion trend determination method. The method has low requirement on hardware and needs no complicated C/S (client and server) data processing architecture. An intelligent mobile terminal is allowed to autonomously process results and determine the indoor position, and motion trend of the current intelligent mobile terminal can be obtained.

Description

A kind of method differentiating movement tendency based on bluetooth

Technical field

The present invention relates to a kind of method differentiating movement tendency, particularly a kind of method differentiating movement tendency based on bluetooth.

Background technology

Current location technology is mainly divided into two classes: outdoor positioning technology and. indoor positioning technologies.

At present, outdoor positioning system has the GPS of the U.S., Muscovite glonass system, the dipper system of China and the Galileo in Europe and mobile operation network base station (AGPS) location technology.At outdoor employing satellite fix, there is the advantages such as wide coverage, user's access amount be large.But because all there are some inherent defects in outdoor positioning technology: positioning precision is low, indoor signal is weak, search star time length etc.But when user enters into indoor time, the positioning precision of these navigation systems just sharply declines.Mainly because indoor obstruct is on the impact of signal.So, in order to solve the problem of indoor positioning, derive multiple indoor navigation system and method.

The major technique being currently applied to indoor positioning has UWB (ultra broadband), RFID(radio-frequency (RF) identification) and the technology such as bluetooth (Bluetooth).

One, UWB (ultra broadband) technology a kind ofly completely newly, with conventional communication techniques has the New Communication Technology of huge difference.It does not need to use the carrier wave in traditional communication system, but transmits data by sending and receive the ultra-narrow pulse with below nanosecond or nanosecond, thus has the bandwidth of GHz magnitude.Radio ultra wide band system, compared with traditional narrowband systems, has that penetration power is strong, low in energy consumption, anti-multipath is effective, fail safe is high, system complexity is low, can provide the advantages such as accurate positioning precision.

Two, radio-frequency (RF) identification and RFID(Radio Frequency IDentification) technology, also known as electronic tag, radio frequency identification, it is a kind of communication technology, read and write related data by radio signals identification specific objective, and without the need to setting up machinery or optical contact between recognition system and specific objective.The application of current RFID technique is very wide, and as library, gate control system, food security is traced to the source, indoor positioning etc.

RFID location system composition structure mainly comprises: electronic tag, antenna, read write line, CIS (computer).As shown in Figure 1.

The basic functional principle of RFID location system: after label enters magnetic field, receive the radiofrequency signal that plug-in reader sends, the energy obtained by means of induced current sends out storage product information in the chips (Passive Tag, passive label or passive label), or signal (the Active Tag of a certain frequency is initiatively sent by label, active label or active tag), plug-in reader reads information and after decoding, delivers to CIS and carry out relevant data process.

The shortcoming of RFID location system is listed below:

1. the hardware device costs such as the electronic tag comprised in rfid system, reflector, read write line, encoder and antenna are high, and need special customization.

2. the network layout very complicated of antenna in rfid system, adds cost and drop into, and maintenance difficulties is large.

3. there is uncontrollability in the electronic tag in rfid system, relates to privacy concern.(RFID cannot confirm that whether this rfid interrogator is legal, when it once enter into read write line sensing scope, unconditionally will automatically send tag identity message, easily cause the leakage of individual privacy.）

4. RFID frequency open frequency range ununified in the world, various countries' open frequency range is all different, and consistency there are differences problem.The frequency range that RFID technique uses is 50KHz-5.8GHz, and the range of application of each series standard also has larger difference.

Three, bluetooth (Bluetooth) technical spirit is a kind of short distance radio communication standards.It is based on the near radio of low cost connects, and sets up one be connected the data communication carrying out equipment room especially for fixing with mobile device communication environment.Bluetooth standard working frequency range is the ISM band of 2.4GHz.Up-to-date bluetooth 4.0 version is still backward compatible, comprises the blue teeth high speed technical specification of classical bluetooth specification and maximum speed 24Mbps, and general communication distance is within 15 meters, and maximum communication distance can more than 100 meters.

(application number is invention disclosed patent in 2013: 201210306880.6) " a kind of method and system realizing location based on Bluetooth technology ".It is based on mobile terminal, the navigation system of Bluetooth AP (access point) and server construction, in its position fixing process, mobile terminal needs repeatedly broadcast message to be communicated with server by the transport communication network built by Bluetooth AP, after server process, obtain a kind of method of the positional information of current mobile terminal, and send to mobile terminal.

First, need to build complicated Bluetooth AP transport communication network.

Then, after Bluetooth AP receives mobile terminal broadcast message, by information transmission to private server process.

Server, by the result after process, is again transferred to mobile terminal by Bluetooth AP, finally converts mobile terminal indoor location to.

This patent shortcoming:

1. the network struction of Bluetooth AP transport communication is complicated, and maintenance work inconvenience, hardware cost is high.

2. the data needing specialized server process to be sent by Bluetooth AP, there will be Data Network delay and data bandwidth problem.

3. can only obtain the positional information of mobile terminal in current indoor.

Summary of the invention

For problems of the prior art, the object of this invention is to provide a kind of low to hardware requirement, do not need complicated C/S(mobile terminal and server) data processing architecture, intelligent mobile terminal can autonomous result, and determines indoor location, can obtain the method for the movement tendency of current intelligent mobile terminal.

In order to achieve the above object, the present invention is by the following technical solutions: a kind ofly differentiate the method for movement tendency based on bluetooth, its step comprises:

1) lay bluetooth sensor, described bluetooth sensor between two between distance D >=4m, indoor entrance and exit must lay demarcates corresponding entrance and export bluetooth sensor;

2) bluetooth sensor is laid in advance indoor porch and is labeled as transducer 0, when user enters before the indoor environment of default transducer, mobile terminal software prompting user opened bluetooth function; After mobile terminal detects transducer 0, thus formally enter bluetooth indoor positioning pattern;

3) when being on default sensor line, mobile terminal bluetooth equipment also can inquire about its RSSI signal strength values by timing search current region inner sensor equipment, is can know the bluetooth RSSI signal strength values of current circular radius within the scope of 15 meters and distance relation figure respectively according to the sensor ID RSSI signal strength values corresponding to it obtained;

4) when mobile terminal and bluetooth distance of reaction being set within 2 meters, the respective sensor RSSI signal strength values obtained is with V >=-60dbm (± 5dbm), two maximum MAX(Vx of RSSI are found in the transducer RSSI signal strength signal intensity value list obtained from this result of detection, Vy, Vz ... )=(Vx, Vy), now relation is had: Vx >=Vy;

5) as Vx<-60 ± 5dbm, Vy >=-60 ± 5dbm, MAX (Vx, Vy, Vz ... )=(Vy, Vz) time, now have relation: Vx<Vy, Vy >=Vz;

6) according to twice, front and back statistics, the movement tendency of current mobile terminal is obtained namely: gradually away from sensors X, through transducer Y, and gradually near transducer Z;

7), when detecting the outlet transducer laid in advance when mobile terminal leaves indoor outlet, power cut-off pattern, so far movement tendency method terminates.

After adopting technique scheme, the present invention has following beneficial effect:

1. in native system using universal blue tooth adapter as " bluetooth sensor ", need not special hardware exploitation customization, the bluetooth hardware module of mass production on market, with low cost, only need a few yuan.

2. native system only comprises intelligent mobile terminal and " bluetooth sensor " two parts.Intelligent mobile terminal (as smart mobile phone, flat board) with Bluetooth function need not be equipped with extra electron hardware module again, it is relied on to carry Bluetooth function and finder, " bluetooth sensor " network just can laid in advance with periphery carries out sensing identification location, simple structure, meet design requirement, solve RFID complicated architectures problem.

3. this function of RSSI S meter inquiry detection that bluetooth module carries can as the difference means of wireless sensing location.

4. it is mutual that the network function that the communication data in indoor positioning process can be carried by intelligent mobile terminal and server carry out data communication.And auxiliary network equipment structure communication network need not be laid in addition.

Accompanying drawing explanation

Fig. 1 is the structural representation of RFID location system.

Fig. 2 is bluetooth sensor position view when to be that the present invention is a kind of differentiate that the method for movement tendency adopts in straight line path layout environments based on bluetooth.

Fig. 3 is a kind of method employing turning path layout differentiating movement tendency based on bluetooth of the present invention

Bluetooth sensor position view time in environment.

Fig. 4 is bluetooth sensor position view when to be that the present invention is a kind of differentiate that the method for movement tendency adopts in " T-shaped " path layout environment based on bluetooth.

Fig. 5 is bluetooth sensor position view when to be that the present invention is a kind of differentiate that the method for movement tendency adopts in " cross " path layout environment based on bluetooth.

Fig. 6 is bluetooth sensor position view when to be that the present invention is a kind of differentiate that the method for movement tendency adopts in " star-like " path layout environment based on bluetooth.

Fig. 7 is graph of a relation between a kind of method " RSSI-distance " differentiating movement tendency based on bluetooth of the present invention.

Fig. 8 is a kind of method process chart differentiating movement tendency based on bluetooth of the present invention.

Fig. 9 is a kind of method decision flow chart differentiating movement tendency based on bluetooth of the present invention.

Embodiment

Below in conjunction with specific embodiment, the present invention is further explained.

Hardware platform

Mobile terminal: Android platform bluetooth 2.1,

Transducer: based on the Bluetooth adapter of CSR BC4 chip.

As shown in Figure 7, a kind of method differentiating movement tendency based on bluetooth, its step comprises:

1) lay bluetooth sensor, described bluetooth sensor between two between distance D >=4m, indoor entrance and exit must lay demarcates corresponding entrance and export bluetooth sensor;

2) bluetooth sensor is laid in advance indoor porch and is labeled as transducer 0, when user enters before the indoor environment of default transducer, mobile terminal software prompting user opened bluetooth function; After mobile terminal detects transducer 0, thus formally enter bluetooth indoor positioning pattern;

3) when being on default sensor line, mobile terminal bluetooth equipment also can inquire about its RSSI signal strength values by timing search current region inner sensor equipment, is can know the bluetooth RSSI signal strength values of current circular radius within the scope of 15 meters and distance relation figure respectively according to the sensor ID RSSI signal strength values corresponding to it obtained;

4) when mobile terminal and bluetooth distance of reaction being set within 2 meters, the respective sensor RSSI signal strength values obtained is with V >=-60dbm (± 5dbm), two maximum MAX(Vx of RSSI are found in the transducer RSSI signal strength signal intensity value list obtained from this result of detection, Vy, Vz ... )=(Vx, Vy), now relation is had: Vx >=Vy;

5) as Vx<-60 ± 5dbm, Vy >=-60 ± 5dbm, MAX (Vx, Vy, Vz ... )=(Vy, Vz) time, now have relation: Vx<Vy, Vy >=Vz;

6) according to twice, front and back statistics, the movement tendency of current mobile terminal is obtained namely: gradually away from sensors X, through transducer Y, and gradually near transducer Z;

7), when detecting the outlet transducer laid in advance when mobile terminal leaves indoor outlet, power cut-off pattern, so far movement tendency method terminates.

Embodiment one: straight line path layout

As shown in Figure 2, during optimal perceived regional extent that mobile terminal enters " entrance " " bluetooth sensor " (" transducer 0 "), movement tendency perception will be entered and judge state.The result that obtain of mobile terminal by program backstage timing probe and after process: when convergence " transducer 0 ", its RSSI value V levels off to-20 dbm constantly increasing; When away from " transducer 0 ", its RSSI value V is constantly reducing to level off to-70 dbm.In like manner, other known sensor for the laying on straight path also can obtain similar RSSI change in signal strength curve chart.Thus according to pre-setting locus value, obtain the position in current residing space, and can by the demarcation of process " bluetooth sensor " obtain current kinetic trend (forward or backward, convergence or the motion away from a certain locus).Enter " outlet " " bluetooth sensor " (" transducer 3 ") optimal perceived regional extent when mobile terminal and have away from trend, and after finally leaving optimal perceived regional extent, background program will terminate movement tendency perception activity.

When adopting in straight line path layout environments, intelligent mobile terminal can perception current kinetic trend: forward or backward, convergence or the four kinds of dynamic motion trend such as motion away from a certain locus, and indoor particular location.

Embodiment two: turning path layout

As shown in Figure 3, when mobile terminal enters other that " entrance " " bluetooth sensor " (" transducer 0 ") and " outlet " " bluetooth sensor " (" transducer 3 ") and straight line path track are laid " bluetooth sensor " (" transducer 1 " and " transducer 3 ") optimal perceived regional extent time, perceive motion trend method is identical with 1 straightaway trajectory path method.

Whether lay around the corner " bluetooth sensor " (" transducer 2 ") have two kinds of situations:

(1) do not lay " bluetooth sensor " (" transducer 2 "), now mobile terminal will advance into detection space state (namely cannot perception turning trend) entering turning.Only have when it enters the next one " bluetooth sensor " (" transducer 3 ") optimal perceived regional extent time, movement tendency perception can be proceeded.Namely there will be movement tendency and judge discontinuous situation.By preset calibrations " bluetooth sensor " between relation obtain corresponding sports trend (to the left or to the right)

(2) lay " bluetooth sensor " (" transducer 2 "), now continuous probe process can be carried out to movement tendency continuously in mobile terminal.By preset calibrations " bluetooth sensor " between relation obtain corresponding sports trend (to the left or to the right, convergence or the motion away from corner location)

When adopting in turning path layout environments, intelligent mobile terminal can perception current kinetic trend: forward or backward, convergence or away from six kinds of dynamic motion trend such as a certain locus, to the left or to the right motion, and indoor particular location.

Embodiment three: " T-shaped " path layout

As shown in Figure 4, when mobile terminal enters other that " entrance " " bluetooth sensor " (" transducer 0 ") and " outlet " " bluetooth sensor " (" transducer 2 " or " transducer 3 ") and straight line path track are laid " bluetooth sensor " (" transducer 1 " and " transducer 3 ") optimal perceived regional extent time, perceive motion trend method is identical with 1 straightaway trajectory path method.

When mobile terminal enters " transducer 1 ", " transducer 2 " and " transducer 3 " formed " equilateral triangle inscribed circle shape region ", following situation will be obtained:

When motion of mobile terminals trend is away from " transducer 1 ", " transducer 1 " RSSI value that background program obtains constantly is diminishing, and the RSSI value of " transducer 2 " and " transducer 3 " is constantly becoming large.When entering " the three circumscribed regions of circle " be made up of three transducers, this region will be " error band " (this area size is according to reality " bluetooth sensor " lay situation and determine), and namely the probe value of acquisition for mobile terminal temporarily will cannot judge movement tendency.Only have when mobile terminal enters wherein a certain again " bluetooth sensor " optimal perceived regional extent time, current kinetic trend (to the left or to the right, forward or backward) can be obtained.

When adopting in " T-shaped " path layout environment, intelligent mobile terminal can perception current kinetic trend: forward or backward, convergence or away from six kinds of dynamic motion trend such as a certain locus, to the left or to the right motion, and indoor particular location.

Embodiment four: " cross " path layout

As shown in Figure 5, when mobile terminal enters other that " entrance " " bluetooth sensor " (" transducer 0 ") and " outlet " " bluetooth sensor " (" transducer 2 " or " transducer 3 " or " transducer 4 ") and straight line path track are laid " bluetooth sensor " (" transducer 1 " and " transducer 3 ") optimal perceived regional extent time, perceive motion trend method is identical with 1 straightaway trajectory path method.

When mobile terminal enters " transducer 1 ", " transducer 2 ", " transducer 3 " or " transducer 2 ", " transducer 3 ", " transducer 4 " formed " equilateral rectangular area ", following situation will be obtained:

1. when motion of mobile terminals trend is away from " transducer 1 ", " transducer 1 " RSSI value that background program obtains constantly is diminishing, and the RSSI value of " transducer 2 " and " transducer 3 " is constantly becoming large.When entering " the three circumscribed regions of circle " be made up of three transducers (" transducer 1 ", " transducer 2 ", " transducer 3 "), this region will be " error band " (this area size is according to reality " bluetooth sensor " lay situation and determine), and namely the probe value of acquisition for mobile terminal temporarily will cannot judge movement tendency.Only have when mobile terminal enters wherein a certain again " bluetooth sensor " the optimal perceived regional extent of (" transducer 1 " or " transducer 2 " or " transducer 3 ") time, current kinetic trend (forward or backward, to the left or to the right) can be obtained.

2. motion of mobile terminals trend is just when convergence " transducer 4 ", and " transducer 4 " RSSI value that background program obtains constantly is becoming large, and the RSSI value of " transducer 2 " and " transducer 3 " is in continuous reduction.When entering " the three circumscribed regions of circle " be made up of three transducers (" transducer 2 ", " transducer 3 ", " transducer 4 "), this region will be another " error band " (this area size is according to reality " bluetooth sensor " lay situation and determine), and namely the spy value of acquisition for mobile terminal temporarily will cannot judge movement tendency.Only have when mobile terminal enters wherein a certain again " bluetooth sensor " the optimal perceived regional extent of (" transducer 2 " or " transducer 3 " or " transducer 4 ") time, current kinetic trend (forward or backward, to the left or to the right) can be obtained.

When adopting in " cross " path layout environment, intelligent mobile terminal can perception current kinetic trend: forward or backward, convergence or away from six kinds of dynamic motion trend such as a certain locus, to the left or to the right motion, and indoor particular location.

Embodiment five: " star-like " path layout

As shown in Figure 6, when mobile terminal enters, " when entrance " bluetooth sensor " (" transducer 0 ") and " outlet " " bluetooth sensor " (" transducer 1 " or or " transducer 2 " or " transducer 3 " or " transducer 4 ") optimal perceived regional extent, perceive motion trend method is identical with 1 straightaway trajectory path method.

When mobile terminal enters " transducer 0 ", " transducer 1 ", " transducer 2 ", " transducer 3 ", " transducer 4 " formed " star polygon region ", to enter " error band " (this area size is according to reality " bluetooth sensor " lay situation and determine), namely the spy value of acquisition for mobile terminal temporarily will cannot judge movement tendency.Only have when mobile terminal is through this region, again enter wherein a certain " bluetooth sensor " the optimal perceived regional extent of (" transducer 0 " or " transducer 1 " or " transducer 2 " or " transducer 3 " or " transducer 4 ") time, the current movement tendency trending towards a certain preset calibrations transducer can be obtained.

When adopting in " star-like " path layout environment, intelligent mobile terminal can perception current kinetic trend: forward or backward, convergence or away from six kinds of dynamic motion trend such as a certain locus, to the left or to the right motion, and indoor particular location.

The layout type of " bluetooth sensor " needs to carry out rational deployment according to path situation in specific environment, and the present invention is that upper five kinds of conventional path laying provides respective sensor optimal location scheme.By adopting above optimal location scheme above, the movement tendency in bluetooth indoor positioning differentiates the result that can obtain optimal movement trend discrimination.

And the present invention is directed to the advantage of above deficiency:

1. pair hardware requirement is low, only needs universal blue tooth adapter to be used as " bluetooth sensor ", does not need Bluetooth AP transfer of data networking function, so dispose with maintenance cost cheap.

2. the movement tendency discriminating program in intelligent mobile terminal only needs cycle probe queries periphery " bluetooth sensor ", do not need complicated C/S(mobile terminal and server) data processing architecture, intelligent mobile terminal can autonomous result, and determines indoor location.

3. intelligent mobile terminal only needs, to after processing according to periphery " bluetooth sensor " probe queries result, can obtain the movement tendency of current intelligent mobile terminal.

Claims (1)

1. differentiate a method for movement tendency based on bluetooth, its step comprises:

1) lay bluetooth sensor, described bluetooth sensor between two between distance D >=4m, indoor entrance and exit must lay demarcates corresponding entrance and export bluetooth sensor;

2) bluetooth sensor is laid in advance indoor porch and is labeled as transducer 0, when user enters before the indoor environment of default transducer, mobile terminal software prompting user opened bluetooth function; After mobile terminal detects transducer 0, thus formally enter bluetooth indoor positioning pattern;

3) when being on default sensor line, mobile terminal bluetooth equipment also can inquire about its RSSI signal strength values by timing search current region inner sensor equipment, is can know the bluetooth RSSI signal strength values of current circular radius within the scope of 15 meters and distance relation figure respectively according to the sensor ID RSSI signal strength values corresponding to it obtained;

4) when mobile terminal and bluetooth distance of reaction being set within 2 meters, the respective sensor RSSI signal strength values obtained is with V >=-60dbm (± 5dbm), two maximum MAX(Vx of RSSI are found in the transducer RSSI signal strength signal intensity value list obtained from this result of detection, Vy, Vz ... )=(Vx, Vy), now relation is had: Vx >=Vy;

5) as Vx<-60 ± 5dbm, Vy >=-60 ± 5dbm, MAX (Vx, Vy, Vz ... )=(Vy, Vz) time, now have relation: Vx<Vy, Vy >=Vz;

6) according to twice, front and back statistics, the movement tendency of current mobile terminal is obtained namely: gradually away from sensors X, through transducer Y, and gradually near transducer Z;

7), when detecting the outlet transducer laid in advance when mobile terminal leaves indoor outlet, power cut-off pattern, so far movement tendency method terminates.