CN103841639A - Wireless local area network technology for indoor positioning - Google Patents
Wireless local area network technology for indoor positioning Download PDFInfo
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- CN103841639A CN103841639A CN201310646769.6A CN201310646769A CN103841639A CN 103841639 A CN103841639 A CN 103841639A CN 201310646769 A CN201310646769 A CN 201310646769A CN 103841639 A CN103841639 A CN 103841639A
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Abstract
The invention relates to a wireless local area network, indoor positioning, the information collection and processing technology and the signal strength technology, in particular to the wireless local area network technology for the indoor positioning. The wireless local area network is widely applied to indoor environments and hot spots where people perform activities due to characteristics of high communication speed and simple deployment. Compared with the outdoor positioning, the requirement of the indoor positioning for positioning precision is higher. Furthermore, lots of interference factors such as various walls, partition walls, people or furnishings existing in the indoor space can affect transmission of wireless signals, such as attenuation, reflection, scattering, multipath effect and the like of the wireless signals. The wireless local area network technology for the indoor positioning based on the WIFI seamless positioning technology is used for providing network security of the wireless local area network for enterprise-class users. WIFI can have functions of achieving wireless access and transmitting data and be used for the indoor positioning. On the basis of having no need for additional hardware, the WIFI network can analyze signal strength or signal to noise ratio of a wireless network device to infer the position of a target object.
Description
Technical field
The present invention relates to WLAN (wireless local area network), indoor positioning, information gathering and treatment technology, signal strength techniques, relate in particular to a kind of wireless local area network technology for indoor positioning.
Background technology
Along with the continuous expansion of GPS radio network technique, mobile communication and the application of universal computing technique and deeply, the service based on perceived position seems more and more important.Global positioning system is the very successful and quite ripe status technology of using present stage, although can be provided and be approached global location coverage by GPS.But, in the densely covered city of indoor and high building because GPS sensing cannot be located less than satellite-signal, under complicated indoor environment, the most general location technology of application is mainly sensor technology, this technology is by the sensor network of disposing in advance, perception enters the object of relevant range, complete the location of object, typical system has infrared sensing navigation system, vibration/sound sensing positioning system etc.Sensing positioning system needs special equipment and network support, and is limited to sensing range and the sensing network deployment of transducer, cannot complete accurate location and positioning service covering on a large scale.
WLAN (wireless local area network) location technology is the measurement based on to wireless signal strength.In 802.11 standards, wireless network card and AP can measure the signal strength signal intensity of radio frequency signal, i.e. received signal strength indicator RSSI.The signal strength signal intensity of the signal strength signal intensity of the signal frame that wireless network card measurement AP sends, the signal frame that AP measurement wireless network card sends.Conventionally the transmitting power of AP is higher than wireless network card, and signal attenuation is more stable than wireless network card, the mode of a kind of RSSI of measurement before therefore generally all adopting.Compared with outdoor positioning, indoor positioning is higher to the requirement of positioning precision.In addition, in the interior space, there is many disturbing factors, as various bodies of wall, partition, people or various furniture furnishings etc. all can impact the transmission of wireless signal, as the decay of wireless signal, reflection, scattering and multipath effect etc.Even if a people stands on fixing position, its direction is towards AP or back to AP, and signal strength signal intensity also has very large difference.These have all increased the difficulty of WLAN (wireless local area network) indoor positioning.
Along with the proposition of " wireless city " concept, many countries and regions have all proposed WIFI network coverage plan, and put into practice.The expansion of WIFI network coverage has also promoted the development of the terminal of integrating WIFI receiver module.Wireless aps is only done simple signals collecting work, and location Calculation is completed by location-server.Consider based on load balancing, the location-server of the Web server of response position request and operation location Calculation is independently separated as much as possible.Client is the wireless signal strength that mobile device (as notebook, smart mobile phone etc.) is mainly used in gathering periphery AP, and submit signal characteristic to location-server, positioning analysis software is by calculated data source---the wireless signal strength receiving, the mapping relations that during with original field test, electronic chart and positional information are set up position calculating, thereby obtain the location estimation of mobile terminal.In addition, because the antijamming capability of WiFi is strong, have good network stabilization and at a high speed and the characteristic such as high-quality transfer of data, service system is transmitted a large amount of information provides reliable guarantee.Nowadays WiFi technology has been the standard configuration of all intelligent family moving platforms in addition, utilizes extensively general WiFi system to do the technology that location is a low cost and easy realization.
Summary of the invention
1, technical problem to be solved
Current sensing positioning system needs special equipment and network support, and is limited to sensing range and the sensing network deployment of transducer, cannot complete accurate location and positioning service covering on a large scale.
2, technical scheme
In order to overcome the above problems, the invention provides a kind of wireless local area network technology for indoor positioning, comprising: wireless aps, positioning analysis software (customization), Web server, location-server, database server.Wireless aps is only done simple signals collecting work, and location Calculation is completed by location-server.Consider based on load balancing, the location-server of the Web server of response position request and operation location Calculation is independently separated as much as possible.Client is the wireless signal strength that mobile device (as notebook, smart mobile phone etc.) is mainly used in gathering periphery AP, and submit signal characteristic to location-server, positioning analysis software is by calculated data source---the wireless signal strength receiving, the mapping relations that during with original field test, electronic chart and positional information are set up position calculating, thereby obtain the location estimation of mobile terminal.This scheme comprise off-line analysis and online location two off-line analysis stages in stage mainly carry out that indoor reference point is chosen, RSS Threshold, RSS data build storehouse and wireless aps position estimation; Online positioning stage, the wireless aps number and the RSS that receive according to user terminal, select triangle location algorithm or fingerprint location algorithm to carry out position calculation.
3, beneficial effect
WLAN (wireless local area network) has that equipment is installed fast, configuration is simple, disposes flexibly, low cost, high scalability etc.
Plurality of advantages, in recent years Ge great telecom operators widely popularize universally, WLAN (wireless local area network) has become a new generation
High-speed radio access network.Thus, the WLAN (wireless local area network) indoor positioning technical method based on wifi overlay network of introducing herein just tool has the following advantages:
1 positioning precision is high
The indoor positioning technology of WLAN (wireless local area network) is that the RSS based on wireless aps analyzes, mixing indoor positioning the method in conjunction with the advantage of triangle location and fingerprint location algorithm comprises off-line analysis and locates online two off-line analysis stages in stage and mainly carry out indoor reference point and choose RSS Threshold RSS data and build storehouse and the online positioning stage of wireless aps position estimation, the wireless aps number and the RSS that receive according to user terminal, select triangle location algorithm or fingerprint location algorithm to carry out position calculation, select different algorithms according to different situations, produce thus less error, improve accuracy.
2 network security performances are strong
Be applied to the continuous position service function that the seamless location technology of the WIFI net of WLAN (wireless local area network) provides, facilitate user to position and navigate simultaneously, also for Real-Time Monitoring user's position provides possibility.As long as when user enters WIFI net signal area, and after being connected to WIFI network, adopt necessary technological means to obtain user's positional information, just can monitor in real time user's access behavior.Identify as RFID if be equipped with necessary recognition technology, in the time that user enters WIFI net, carry out identification.Utilize identification and position monitoring technology, can form the network security solution of a set of position-based information, for the supervision of wireless network secure provides a new technology path.
3 network construction cost are low
Along with the development of wireless network, and the competition of Virtual network operator strengthens, and built wifi focus in many public places, and wireless network more and more enters in average family life, and the coverage rate of wifi net is increasing.WIFI network is not increasing under extra hardware case, recently infers the position of target object by analyzing access point with respect to Wireless Communication Equipment signal strength signal intensity or noise.Client is used or is connected to an access point, and this access point provides the strongest RSS signal.Client roaming, makes regular check on signal strength signal intensity, determines best access point.By signal measurement, can obtain the position of client.Depend on original wifi network and just can realize location.
Brief description of the drawings
Fig. 1 wireless local network positioning system
Embodiment
Below by embodiment, the present invention is described in detail.
Embodiment 1
Its working method is as follows:
1, reference point is chosen
Reference point refers to that the measurement of wireless aps signal and collection point are in the off-line analysis stage; first room area is divided into some grids; each net center of a lattice is considered as to reference point because the large young pathbreaker of grid directly affects computation complexity and the precision of location; can carry out grid division according to situations such as indoor barrier personnel dense degree, conventionally the more complicated area grid of environment is less
2, RSS Threshold
Triangle location and fingerprint location algorithm are applicable to respectively different wireless aps signal environments, RSS threshold value is for the switching of two algorithms, the validity that improves indoor mixed positioning can be according to indoor signal propagation model and positioning accuracy request, RSS threshold value RSSthres in counting chamber.
3, RSS data are built storehouse
Owing to being subject to the impact of the multiple disturbing factors such as scattering refraction barrier; the RSS data that obtain when wireless aps signals collecting have unsteadiness and in each reference point, carry out multiple signal collection; calculating the RSS mean value of each wireless aps and depositing RSS database data interrecord structure in is (RefID; APMAC; AvgRSS, X, Y); wherein, RefID is reference point numbering; APMAC is the Media Access Control address of wireless aps; AvgRSS is the average RSS value of wireless aps; X, Y is respectively the position coordinates of reference point
4, wireless aps position estimation
After signals collecting completes, each wireless aps is selected to 3 reference points of AvgRSS maximum, utilized the position of 3 reference points, adopt triangle centroid algorithm to estimate the position of each wireless aps, and store in RSS database.
5, customer location calculates
In the time that system is received the Location Request that user terminal sends, to locate online, its process prescription is as follows
(1) the multiple wireless aps signals that receive are sent to locating module by user terminal;
(2) locating module contrasts the MAC Address of the multiple wireless aps that receive respectively with RSS database, judges that whether the position of these wireless aps is known;
(3) if the wireless aps of location aware has 3 RSS values at least higher than RSSthres; first utilize signal propagation model to calculate respectively 3 wireless aps that RSS value is the highest and the distance of user terminal; then, adopt triangle centroid algorithm calculate user terminal location and return;
(4), if 3 of the wireless aps deficiencies of location aware or quantity, higher than 3, but have at most 2 RSS values higher than RSSthres, adopt KNN location algorithm calculate user terminal location and return.
Claims (5)
1. for a wireless local area network technology for indoor positioning, comprising: wireless aps, positioning analysis software (customization), Web server, location-server, database server.
2. the wireless local area network technology for indoor positioning as claimed in claim 1, is characterized in that: wireless aps is only done simple signals collecting work, and location Calculation is completed by location-server.
3. the wireless local area network technology for indoor positioning as described in claim 1-2, is characterized in that: consider based on load balancing, the location-server of the Web server of response position request and operation location Calculation is independently separated as much as possible.
4. the wireless local area network technology for indoor positioning as described in claim 1-2, it is characterized in that: client is the wireless signal strength that mobile device (as notebook, smart mobile phone etc.) is mainly used in gathering periphery AP, and submit signal characteristic to location-server, positioning analysis software is by calculated data source---the wireless signal strength receiving, the mapping relations that during with original field test, electronic chart and positional information are set up position calculating, thereby obtain the location estimation of mobile terminal.
5. the wireless local area network technology for indoor positioning as described in claim 1-2, is characterized in that: this scheme comprise off-line analysis and online location two off-line analysis stages in stage mainly carry out that indoor reference point is chosen, RSS Threshold, RSS data build storehouse and wireless aps position estimation; Online positioning stage, the wireless aps number and the RSS that receive according to user terminal, select triangle location algorithm or fingerprint location algorithm to carry out position calculation.
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| CN201310646769.6A CN103841639A (en) | 2013-12-05 | 2013-12-05 | Wireless local area network technology for indoor positioning |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103648163A (en) * | 2013-12-06 | 2014-03-19 | 镇江坤泉电子科技有限公司 | Indoor positioning method applied to wireless local area network |
| CN104698435A (en) * | 2015-03-19 | 2015-06-10 | 南京旭品信息科技有限公司 | System and method for realizing positioning wireless beacon geographic position |
| CN105263116A (en) * | 2015-10-30 | 2016-01-20 | 努比亚技术有限公司 | Method and system for drawing movement track |
| CN107765218A (en) * | 2016-08-19 | 2018-03-06 | 东芝泰格有限公司 | Information processor, alignment system, control method and readable storage medium storing program for executing |
| CN109031194A (en) * | 2018-07-12 | 2018-12-18 | 中山火炬职业技术学院 | Indoor hybrid locating method |
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| WO2011140435A1 (en) * | 2010-05-06 | 2011-11-10 | Qualcomm Incorporated | Methods and apparatus for estimating a geolocation of a wireless communications device |
| CN103220777A (en) * | 2013-01-05 | 2013-07-24 | 东莞市力王电池有限公司 | Mobile device positioning system |
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| CN1602020A (en) * | 2004-10-27 | 2005-03-30 | 上海宽鑫信息科技有限公司 | Indoor precision positioner and positioning algorithm of radio local network |
| WO2011140435A1 (en) * | 2010-05-06 | 2011-11-10 | Qualcomm Incorporated | Methods and apparatus for estimating a geolocation of a wireless communications device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103648163A (en) * | 2013-12-06 | 2014-03-19 | 镇江坤泉电子科技有限公司 | Indoor positioning method applied to wireless local area network |
| CN104698435A (en) * | 2015-03-19 | 2015-06-10 | 南京旭品信息科技有限公司 | System and method for realizing positioning wireless beacon geographic position |
| CN105263116A (en) * | 2015-10-30 | 2016-01-20 | 努比亚技术有限公司 | Method and system for drawing movement track |
| CN107765218A (en) * | 2016-08-19 | 2018-03-06 | 东芝泰格有限公司 | Information processor, alignment system, control method and readable storage medium storing program for executing |
| CN109031194A (en) * | 2018-07-12 | 2018-12-18 | 中山火炬职业技术学院 | Indoor hybrid locating method |
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Application publication date: 20140604 |