CN111182585B - WLAN-based indoor positioning method and system - Google Patents
WLAN-based indoor positioning method and system Download PDFInfo
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- CN111182585B CN111182585B CN201911356437.8A CN201911356437A CN111182585B CN 111182585 B CN111182585 B CN 111182585B CN 201911356437 A CN201911356437 A CN 201911356437A CN 111182585 B CN111182585 B CN 111182585B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
- H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3911—Fading models or fading generators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
Abstract
The invention discloses an indoor positioning method and system based on WLAN, the method comprises: sensing a received signal strength indicating value of a wireless access point through a positioning target; based on a preset attenuation model, searching and matching in a preset fingerprint database according to the received signal strength indicated value, and calculating to obtain a coarse position of a positioning target; receiving a positioning control instruction sent by a positioning server, extracting information of the positioning control instruction, packaging and sending a positioning frame; receiving frame response of a positioning target, performing statistical analysis on the received frame response to obtain a positioning response rate, and sending the positioning response rate to a positioning server; the positioning server performs distance calculation according to the positioning response rate and the coarse position of the positioning target to determine an optimal distance estimation value; the method and the system can effectively improve the positioning accuracy, can be deployed on the existing wireless environment and user-held equipment, reduce the cost of the positioning method and have strong operability.
Description
Technical Field
The present invention relates to the field of information technologies, and in particular, to an indoor positioning method and system based on a WLAN.
Background
Due to the shielding of obstacles, a Global Positioning System (GPS) cannot work normally in an indoor environment. Under the continuous promotion of Indoor Positioning requirements, an Indoor Positioning System (IPS) has been regarded and rapidly developed, and various Indoor Positioning schemes have been brought forward. Taking IPS based on WLAN as an example, the positioning technology mainly models according to the propagation characteristics of signals, considers factors such as reflection, refraction, diffraction, and the like, and constructs a radio map of a positioning environment according to the absorption and scattering conditions of radio, and the technology is an effective and low-cost indoor positioning scheme.
However, the current WLAN-based positioning technology has many problems, for example, it is difficult to find the los (line Of sight) channel between the signal transmitter and the signal receiver in an indoor environment, and multipath fading is seriously affected in a tunnel environment, so that it is difficult to accurately measure and calculate the arrival time and the arrival angle Of the signal; in addition, an extra high-precision measuring tool needs to be added, so that the system cost is high, and the practicability is greatly reduced.
Disclosure of Invention
In order to solve the problems of high calculation difficulty, poor practicability and high cost of the existing indoor positioning technology in the background art, the invention provides an indoor positioning method and system based on a WLAN, wherein the method and system increase positioning accuracy and reduce positioning method cost at the same time by adopting dual-mode combined positioning of coarse granularity and fine granularity, and have strong operability, and the indoor positioning method based on the WLAN comprises the following steps:
sensing a received signal strength indicating value of a wireless access point through a positioning target;
based on a preset attenuation model, searching and matching in a preset fingerprint database according to the received signal strength indicated value, and calculating to obtain a coarse position of a positioning target;
receiving a positioning control instruction sent by a positioning server, extracting information of the positioning control instruction, packaging and sending a positioning frame;
receiving frame response of a positioning target, performing statistical analysis on the received frame response to obtain a positioning response rate, and sending the positioning response rate to a positioning server;
and the positioning server performs distance calculation according to the positioning response rate and the coarse position of the positioning target to determine an optimal distance estimation value.
Further, before the value indicating the received signal strength of the wireless access point is sensed by the positioning target, the method further comprises:
the wireless access point group divides the whole positioning area into a certain number of positioning units;
and the positioning target determines the affiliated positioning unit according to the connected wireless access point.
Further, the method for calculating the coarse position of the positioning target includes:
sensing the network environment by a positioning target, and counting to obtain the received signal strength indicated values of a plurality of groups of wireless access points;
determining the relative position of a positioning target and a wireless access point according to the received signal strength indicated values of a plurality of groups of wireless access points based on a received signal strength indicated value shadow propagation model;
and calculating the coarse position of the positioning target according to the relative position and the position of the positioning unit.
Further, the method for extracting the positioning control instruction information includes:
extracting the MAC address and the IP address of the positioning server in the positioning control instruction information;
starting a data generator;
and filling the extracted information into a positioning frame, packaging the positioning frame and sending the positioning frame.
Further, the method for generating a frame response by the positioning target includes:
the positioning target keeps an air interface interception state, and a positioning frame is filtered from received information;
positioning frame information is extracted through ath9k driving and mac80211 protocol stack;
an acknowledgement character frame is automatically sent to respond as specified by the protocol.
Further, the method for statistically analyzing the received frame response comprises:
counting the received response frame, and comparing the response frame with a threshold value prestored in a database;
if the current frame is larger than the pre-stored threshold value, reducing the transmission power of the positioning frame, and encapsulating and sending the positioning frame again;
if the current positioning response value is smaller than the pre-stored threshold value, the statistical result is the current positioning response value, and the response value is divided by the total number of the positioning frame sending to obtain the positioning response rate.
Further, the method for determining the optimal distance estimation value comprises the following steps:
obtaining a range of distance estimation values according to the coarse position of the positioning target;
and inquiring a database according to the positioning response rate, and obtaining the optimal value of the distance estimation value according to the pre-stored relationship between the positioning response rate and the distance.
Further, before receiving the positioning control instruction sent by the positioning server, the method further includes:
after the positioning server detects that a new positioning target is added into the wireless system, the positioning server immediately updates a relation list between the wireless access node and the positioning target;
and the positioning server acquires the wireless access node of the positioning target according to the relation list and sends a positioning control instruction to the wireless access node.
A WLAN-based indoor positioning system, the system comprising:
a coarse-grained positioning subsystem and a fine-grained positioning subsystem;
the coarse-grained positioning subsystem is used for roughly estimating the position ranges of the positioning target and the wireless access point;
the fine-grained positioning subsystem comprises a positioning target, a positioning server and a positioning anchor point;
the positioning server is responsible for positioning scheduling and sending a control instruction, distance calculation is carried out according to the received positioning response rate and the coarse position of the positioning target, and an optimal distance estimation value is determined;
the positioning anchor point sends a positioning frame and counts the number of response frames to obtain a positioning response rate, and the positioning response rate is sent to a positioning server;
the positioning target receives the positioning frame and replies a frame response.
Further, the coarse-grained location subsystem further comprises a wireless access point group;
the wireless access point group divides the whole positioning area into a certain number of positioning units;
and the positioning target determines the positioning unit according to the connected wireless access point.
Further, the coarse-grained positioning subsystem senses the network environment and counts to obtain the received signal strength indicated values of a plurality of groups of wireless access points;
the coarse-grained positioning subsystem determines the relative positions of a positioning target and wireless access points according to the received signal strength indicated values of a plurality of groups of wireless access points based on a received signal strength indicated value shadow propagation model;
and the coarse-grained positioning subsystem calculates the coarse position of the positioning target according to the relative position and the position of the positioning unit.
Further, the positioning anchor point extracts the MAC address and the IP address of the positioning server in the positioning control instruction information;
the positioning anchor point starts a data generator;
and the positioning anchor point fills the extracted information into a positioning frame, encapsulates the positioning frame and sends the positioning frame.
Further, the positioning target keeps an air interface interception state, and filters out a positioning frame from the received information;
the positioning target is driven by ath9k and extracts positioning frame information through a mac80211 protocol stack;
and the positioning target automatically sends a confirmation character frame to respond according to the protocol specification.
Further, the fine-grained positioning subsystem further comprises a database, wherein the database is used for storing site information and position information of a positioning target group;
the positioning anchor point counts the received response frame and compares the response frame with a threshold value prestored in a database;
if the current frame is larger than the pre-stored threshold value, reducing the transmission power of the positioning frame, and encapsulating and sending the positioning frame again;
if the current positioning response value is smaller than the pre-stored threshold value, the statistical result is the current positioning response value, and the response value is divided by the total number of the positioning frame sending to obtain the positioning response rate.
Further, the positioning server obtains a range of distance estimation values according to the coarse position of the positioning target;
and the positioning server queries a database according to the positioning response rate and obtains the optimal value of the distance estimation value according to the pre-stored relationship between the positioning response rate and the distance.
Further, after the positioning server detects that a new positioning target is added into the wireless system, the positioning server immediately updates a relation list between the wireless access node and the positioning target;
and the positioning server acquires the wireless access node of the positioning target according to the relation list and sends a positioning control instruction to the wireless access node.
The invention has the beneficial effects that: the technical scheme of the invention provides an indoor positioning method and system based on WLAN, the method adopts a coarse-grained and fine-grained dual-positioning mode, roughly estimates the distance between a station and a wireless access point by a coarse-grained positioning method, then encapsulates and actively sends a positioning frame to perform fine-grained positioning under the unified scheduling of a positioning server, accurately estimates the distance information from a positioning target to the wireless access point, and finally collects positioning data; the method and the system can effectively improve the positioning accuracy, can be deployed on the existing wireless environment and user-held equipment, reduce the cost of the positioning method and have strong operability.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flowchart of an indoor WLAN-based positioning method according to an embodiment of the present invention;
fig. 2 is a block diagram of an indoor WLAN-based positioning system according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of an indoor WLAN-based positioning method according to an embodiment of the present invention; as shown in fig. 1, the method includes:
before positioning, the whole positioning area is divided into a certain number of positioning units by the wireless access point group, and a positioning target can determine the positioning unit according to the connected wireless access point;
the Received Signal Strength Indication (RSSI) describes the attenuation condition of a Signal in the propagation process, a preset attenuation model is established, matching is searched in a preset fingerprint database according to the Received Signal Strength Indication value, the coarse position of a positioning target is obtained through calculation, and coarse-grained positioning is realized;
target positioning can also be performed by receiving multiple sets of RSSI values, the method is as follows:
a positioning target senses the network environment and counts to obtain the received signal strength indicated values of a plurality of groups of wireless access points;
the positioning target determines the relative position of the positioning target and the wireless access point according to the received signal strength indicated values of a plurality of groups of wireless access points based on the received signal strength indicated value shadow propagation model;
and calculating the coarse position of the positioning target according to the relative position and the position of the positioning unit.
starting fine-grained positioning after the coarse position is obtained through calculation;
the positioning server uniformly manages IP resources and statistics of positioning target group data, and when a new positioning target is detected to be added into the wireless system, the positioning server immediately updates a relation list between the wireless access node and the positioning target;
and the positioning server acquires the wireless access node of the positioning target according to the relation list, sends a positioning control instruction to the wireless access node through TCP/IP connection and starts a fine-grained positioning process.
Receiving a positioning control instruction sent by a positioning server, extracting the MAC address and the IP address of the positioning server in the positioning control instruction information, starting a data generator, filling the extracted information into a positioning frame, packaging the positioning frame and sending the positioning frame.
The positioning target keeps an air interface interception state, and a positioning frame is filtered from the received information; positioning frame information is extracted through ath9k driving and mac80211 protocol stack; and finally, according to the protocol specification, automatically sending a confirmation character frame to respond.
as the radio signal is attenuated, the loss rate of the radio frame gradually increases, and therefore, the response frame recovery rate has a certain correspondence with the distance. Based on the method, a positioning algorithm can be designed, the algorithm adaptively adjusts the transmission power of the positioning frame according to the response rate of the frame response, the positioning frame is repeatedly sent until the response rate of the positioning frame is smaller than a certain threshold value, the response rate is finally submitted to a positioning server as a final result, and the positioning server matches distance estimation information according to the response rate; the method is realized as follows:
firstly, carrying out frame copying on a received positioning target frame response at a driving layer and submitting the frame copying to a user space;
then, statistically analyzing the received frame response, and comparing the frame response with a threshold value prestored in a database; if the current frame is larger than the pre-stored threshold value, reducing the transmission power of the positioning frame, and encapsulating and sending the positioning frame again; if the current positioning frame is smaller than the pre-stored threshold value, the statistical result is the current positioning response value, and the response value is divided by the total number of the positioning frame to obtain the positioning response rate;
and finally, uploading the positioning response rate to a positioning server.
150, the positioning server performs distance calculation according to the positioning response rate and the coarse position of the positioning target to determine an optimal distance estimation value;
obtaining an approximate range of the distance estimation value according to the coarse position of the positioning target;
and the positioning server queries the database according to the positioning response rate and obtains the optimal value of the distance estimation value according to the pre-stored relationship between the positioning response rate and the distance.
Fig. 2 is a block diagram of an indoor WLAN-based positioning system according to an embodiment of the present invention, and as shown in fig. 2, the system includes a coarse-grained positioning subsystem 210 and a fine-grained positioning subsystem 220;
the coarse-grained positioning subsystem 210 is used for roughly estimating the location ranges of the positioning target and the wireless access point;
the coarse-grained location subsystem 210 further includes a wireless access point group, where the wireless access point group divides the entire location area into a certain number of location units, and the location target may determine the location unit according to the connected wireless access point.
The coarse positioning subsystem 210 senses the network environment and counts to obtain the received signal strength indicated values of a plurality of groups of wireless access points;
the coarse-grained location subsystem 210 determines the relative positions of the location target and the wireless access points according to the received signal strength indicating values of a plurality of groups of wireless access points based on the received signal strength indicating value shadow propagation model;
the coarse-grained location subsystem 210 calculates a coarse location of the location target according to the relative location and the location of the associated positioning unit.
The fine-grained positioning subsystem 220 comprises a positioning target 2201, a positioning server 2202 and a positioning anchor point 2203;
the positioning server 2202 is responsible for positioning scheduling and sending a control instruction, performs distance calculation according to the received positioning response rate and the coarse position of a positioning target, and determines an optimal distance estimation value;
the positioning anchor point 2203 sends a positioning frame and counts the number of response frames to obtain a positioning response rate, and the positioning response rate is sent to a positioning server;
the positioning target 2201 receives the positioning frame and replies a frame response;
in addition, the system further includes a database 2204 for storing the site information and the location information of the positioning target group.
The preferred embodiment of the fine-grained positioning subsystem is given as follows:
the positioning server 2202 and the positioning anchor point 2203 can be connected in a wired or wireless mode, and a positioning target 2201 is accessed to a wireless system through a 2.4GHz or 5GHz frequency band wireless signal;
when fine-grained positioning is started, the positioning server 2202 sends a positioning control instruction to the positioning anchor point 2203 through TCP/IP connection;
the positioning anchor 2203 extracts the MAC address and the IP address of the positioning server in the positioning control instruction information, starts a data generator, fills the extracted information into a positioning frame, encapsulates the positioning frame, and transmits the positioning frame;
the positioning target 2201 keeps the state of air interface interception, filters out a positioning frame from the received information, extracts the positioning frame information through ath9k drive and mac80211 protocol stack, and finally automatically sends a confirmation character frame to respond according to protocol regulations.
The positioning anchor point 2203 counts the number of response frames sent by the positioning target 2201, and compares the number of response frames with a threshold value prestored in a database 2204; if the statistical result is smaller than the pre-stored threshold value, the statistical result is a current positioning response value, and the response value is divided by the total number of the positioning frame sending to obtain a positioning response rate; sending the location response rate to a location server 2202;
the positioning server 2202 obtains a range of distance estimation values according to the coarse position of the positioning target 2201, queries a database according to the positioning response rate, and obtains an optimal value of the distance estimation values according to a pre-stored relationship between the positioning response rate and the distance.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Reference to step numbers in this specification is only for distinguishing between steps and is not intended to limit the temporal or logical relationship between steps, which includes all possible scenarios unless the context clearly dictates otherwise.
Moreover, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the disclosure and form different embodiments. For example, any of the embodiments claimed in the claims can be used in any combination.
Various component embodiments of the disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. The present disclosure may also be embodied as device or system programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present disclosure may be stored on a computer-readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the disclosure, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems may be embodied by one and the same item of hardware.
The foregoing is directed to embodiments of the present disclosure, and it is noted that numerous improvements, modifications, and variations may be made by those skilled in the art without departing from the spirit of the disclosure, and that such improvements, modifications, and variations are considered to be within the scope of the present disclosure.
Claims (8)
1. A WLAN-based indoor positioning method, the method comprising:
the wireless access point group divides the whole positioning area into a certain number of positioning units;
the positioning target determines the affiliated positioning unit according to the connected wireless access point;
sensing a received signal strength indicating value of a wireless access point through a positioning target;
based on a preset attenuation model, searching and matching in a preset fingerprint database according to the received signal strength indicated value, and calculating to obtain a coarse position of a positioning target;
the calculating to obtain the coarse position of the positioning target comprises:
sensing the network environment by a positioning target, and counting to obtain the received signal strength indicated values of a plurality of groups of wireless access points;
determining the relative position of a positioning target and a wireless access point according to the received signal strength indicated values of a plurality of groups of wireless access points based on a received signal strength indicated value shadow propagation model;
calculating the coarse position of the positioning target according to the relative position and the position of the positioning unit;
the positioning anchor point receives a positioning control instruction sent by a positioning server, extracts the information of the positioning control instruction, packages and sends a positioning frame;
the positioning anchor point receives the frame response of the positioning target, performs statistical analysis on the received frame response to obtain a positioning response rate, and sends the positioning response rate to a positioning server;
the positioning server performs distance calculation according to the positioning response rate and the coarse position of the positioning target to determine an optimal distance estimation value;
the statistically analyzing the received frame responses comprises:
counting the received response frame, and comparing the response frame with a threshold value prestored in a database;
if the current frame is larger than the pre-stored threshold value, reducing the transmission power of the positioning frame, and encapsulating and sending the positioning frame again;
if the current positioning frame is smaller than the pre-stored threshold value, the statistical result is the current positioning response value, and the response value is divided by the total number of the positioning frame to obtain the positioning response rate;
the determining an optimal distance estimate comprises:
obtaining a range of distance estimation values according to the coarse position of the positioning target;
and inquiring a database according to the positioning response rate, and obtaining the optimal value of the distance estimation value according to the pre-stored relationship between the positioning response rate and the distance.
2. The method of claim 1, wherein the extracting the positioning control instruction information comprises:
extracting the MAC address and the IP address of the positioning server in the positioning control instruction information;
starting a data generator;
and filling the extracted information into a positioning frame, packaging the positioning frame and sending the positioning frame.
3. The method of claim 1, wherein the positioning target generation frame response method comprises:
the positioning target keeps an air interface interception state, and a positioning frame is filtered from received information;
positioning frame information is extracted through ath9k driving and mac80211 protocol stack;
an acknowledgement character frame is automatically sent to respond as specified by the protocol.
4. The method according to claim 1, wherein before receiving the positioning control command sent by the positioning server, the method further comprises:
after the positioning server detects that a new positioning target is added into the wireless system, the positioning server immediately updates a relation list between the wireless access node and the positioning target;
and the positioning server acquires the wireless access node of the positioning target according to the relation list and sends a positioning control instruction to the wireless access node.
5. A WLAN-based indoor positioning system, the system comprising:
a coarse-grained positioning subsystem and a fine-grained positioning subsystem;
the coarse-grained location subsystem further comprises a wireless access point group;
the wireless access point group divides the whole positioning area into a certain number of positioning units;
the positioning target determines the affiliated positioning unit according to the connected wireless access point;
the coarse-grained positioning subsystem senses the network environment and counts to obtain the received signal strength indicated values of a plurality of groups of wireless access points;
the coarse-grained positioning subsystem determines the relative positions of a positioning target and wireless access points according to the received signal strength indicated values of a plurality of groups of wireless access points based on a received signal strength indicated value shadow propagation model;
the coarse-grained positioning subsystem calculates the coarse position of the positioning target according to the relative position and the position of the positioning unit;
the coarse-grained positioning subsystem is used for roughly estimating the position ranges of the positioning target and the wireless access point;
the fine-grained positioning subsystem comprises a positioning target, a positioning server and a positioning anchor point;
the positioning server is responsible for sending a positioning control command, and performs distance calculation according to the received positioning response rate and the coarse position of the positioning target to determine an optimal distance estimation value;
the positioning anchor point sends a positioning frame and counts the number of response frames to obtain a positioning response rate, and the positioning response rate is sent to a positioning server;
the positioning target receives the positioning frame and replies a frame response;
the positioning server acquires a range of distance estimation values according to the coarse position of the positioning target;
the positioning server queries a database according to the positioning response rate, and obtains an optimal value of the distance estimation value according to a pre-stored relationship between the positioning response rate and the distance;
after the positioning server detects that a new positioning target is added into the wireless system, the positioning server immediately updates a relation list between the wireless access node and the positioning target;
and the positioning server acquires the wireless access node of the positioning target according to the relation list and sends a positioning control instruction to the wireless access node.
6. The system of claim 5, wherein:
the positioning anchor point extracts the MAC address and the IP address of the positioning server in the positioning control instruction information;
the positioning anchor point starts a data generator;
and the positioning anchor point fills the extracted information into a positioning frame, encapsulates the positioning frame and sends the positioning frame.
7. The system of claim 5, wherein:
the positioning target keeps an air interface interception state, and a positioning frame is filtered from received information;
the positioning target is driven by ath9k and extracts positioning frame information through a mac80211 protocol stack;
and the positioning target automatically sends a confirmation character frame to respond according to the protocol specification.
8. The system of claim 5, wherein:
the fine-grained positioning subsystem further comprises a database, wherein the database is used for storing site information and position information of a positioning target group;
the positioning anchor point counts the received response frame and compares the response frame with a threshold value prestored in a database;
if the current frame is larger than the pre-stored threshold value, reducing the transmission power of the positioning frame, and encapsulating and sending the positioning frame again;
if the current positioning response value is smaller than the pre-stored threshold value, the statistical result is the current positioning response value, and the response value is divided by the total number of the positioning frame sending to obtain the positioning response rate.
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| CN102170697B (en) * | 2011-04-06 | 2014-09-17 | 北京邮电大学 | Indoor positioning method and device |
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