CN107864451B - Target positioning method and system based on mobile terminal and WiFi probe - Google Patents
Target positioning method and system based on mobile terminal and WiFi probe Download PDFInfo
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- CN107864451B CN107864451B CN201711014599.4A CN201711014599A CN107864451B CN 107864451 B CN107864451 B CN 107864451B CN 201711014599 A CN201711014599 A CN 201711014599A CN 107864451 B CN107864451 B CN 107864451B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location 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 relates to a target positioning method and a system thereof based on a mobile terminal and a WiFi probe, wherein the method comprises the steps of establishing the connection between the mobile terminal and the WiFi probe; acquiring detection data of a WiFi probe; and analyzing and processing the detection data to acquire the related information of the target equipment. According to the invention, the mobile terminal and the WiFi probe connected with the mobile terminal are arranged, the target MAC address and the signal strength of the target equipment are obtained after analysis and processing are carried out by the mobile terminal according to the detection data fed back by the WiFi probe, so as to position the target equipment, and the target positioning is carried out by combining the target MAC address, the target name and the data of the signal strength, so that the hotspot signal scanned by the mobile terminal and the data packet detected by the WiFi probe are realized, the position of the target is positioned, the positioning is accurate, and the expansion capability is strong.
Description
Technical Field
The invention relates to a target positioning method, in particular to a target positioning method and a target positioning system based on a mobile terminal and a WiFi probe.
Background
In real life, people often have the requirements of finding people and finding objects. No matter who looks for any object, such as a person or thing, some characteristics of the object need to be known, and the object is searched for the characteristics or the related things of the characteristics in the space environment. Preferably, these features uniquely identify the target so as to avoid finding different targets with the same features. With the increasing popularity of intelligent devices, devices accessing the internet using WIFI are increasing, wherein a MAC address is just one unique feature for identifying the devices.
Currently, the global positioning system is the most common way to obtain location information of outdoor environment. In recent years, with the rapid development of wireless mobile communication technology, a-GPS positioning mode combining GPS and cellular network is gradually applied in emergency rescue and various location-based services, but since satellite signals are easily blocked by obstacles, the satellite positioning technologies such as GPS and AGPS are not suitable for occasions with obstacles such as indoor or high-rise standing, etc., but the wireless positioning technology is rapidly developed at present and has become a powerful supplement to GPS, wherein the more popular Wi-Fi positioning is a positioning solution of IEEE802.11 of the wireless local area network series standard, but the Wi-Fi positioning is made into a database corresponding to the latitude and longitude of a base station by collecting the MAC address of the Wi-Fi base station in some areas, the positioning process depends on the existing MAC address and location information in the database, and the MAC address and location information in the database cannot be expanded, resulting in its lack of positioning accuracy and scalability.
Therefore, it is necessary to design a target positioning method based on a mobile terminal and a WiFi probe, which locates the position of a target by using a hotspot signal scanned by the mobile terminal and a data packet detected by the WiFi probe, and has accurate positioning and strong expandability.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a target positioning method and a target positioning system based on a mobile terminal and a WiFi probe.
In order to achieve the purpose, the invention adopts the following technical scheme: a target positioning method based on a mobile terminal and a WiFi probe comprises the following steps:
establishing connection between the mobile terminal and the WiFi probe;
acquiring detection data of a WiFi probe;
analyzing and processing the detection data to obtain relevant information of the target equipment;
acquiring detection data of a WiFi probe, wherein the detection data comprises a source MAC address, a destination MAC address and signal intensity;
the method comprises the following steps of analyzing and processing the detection data to obtain the relevant information of the target equipment:
obtaining target address associated data according to the detection data;
analyzing the signal intensity in the detection data, and acquiring related information of the target equipment by combining a target address;
the step of obtaining the target address associated data according to the detection data comprises the following specific steps:
searching an address meeting the requirement in the source MAC address to form target address associated data;
judging whether the target MAC address is a broadcast address;
if so, analyzing the signal intensity in the detection data, and acquiring related information of the target equipment by combining a target address;
if not, replacing the target address with the destination MAC address, shielding other addresses in the source MAC address, analyzing the signal intensity in the detection data, and acquiring related information of the target equipment by combining the target address;
the method comprises the following steps of analyzing the signal intensity in the detection data and acquiring the related information of the target equipment by combining a target address:
calculating the distance between the target address and the mobile terminal according to the signal intensity;
and acquiring the hotspot name and the target address position according to the distance and the target address associated data.
The invention also provides a target positioning system based on the mobile terminal and the WiFi probe, which comprises a connection establishing unit, a detection data acquiring unit and a target acquiring unit;
the connection establishing unit is used for establishing the connection between the mobile terminal and the WiFi probe;
the detection data acquisition unit is used for acquiring detection data of the WiFi probe;
the target acquisition unit is used for analyzing and processing the detection data and acquiring related information of the target equipment;
the target acquisition unit comprises a target address associated data acquisition module and a target information acquisition module;
the target address associated data obtaining module is used for obtaining target address associated data according to the detection data;
the target information acquisition module is used for analyzing the signal intensity in the detection data and acquiring the related information of the target equipment by combining a target address;
the target address associated data obtaining module comprises a target address associated data forming submodule, a judging submodule and an updating submodule;
the target address associated data forming submodule is used for searching an address meeting the requirements in the source MAC address to form target address associated data;
the judgment submodule is used for judging whether the target MAC address is a broadcast address;
the updating submodule is used for replacing the target address with the destination MAC address and shielding other addresses in the source MAC address if the source MAC address is not the target address;
the target information acquisition module comprises a distance calculation submodule and an information acquisition submodule;
the distance calculation submodule is used for calculating the distance between the target address and the mobile terminal according to the signal intensity;
and the information acquisition submodule is used for acquiring the hotspot name and the target address position according to the distance and the target address associated data.
Compared with the prior art, the invention has the beneficial effects that: according to the target positioning method based on the mobile terminal and the WiFi probe, the mobile terminal and the WiFi probe connected with the mobile terminal are arranged, the target MAC address and the signal strength of the target equipment are obtained after analysis and processing are carried out on the mobile terminal according to detection data fed back by the WiFi probe, the target equipment is positioned, and the target positioning is carried out by combining the target MAC address, the target name and the signal strength data, so that a hotspot signal scanned by the mobile terminal and a data packet detected by the WiFi probe are realized, the position of the target is positioned, and the positioning is accurate and the expansion capability is strong.
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a flowchart of a target positioning method based on a mobile terminal and a WiFi probe according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating analysis processing performed on probe data according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating obtaining target address related data according to probe data according to an embodiment of the present invention;
fig. 4 is a flowchart for analyzing signal strength in the detection data and acquiring information related to the target device by combining the target address according to an embodiment of the present invention;
fig. 5 is a block diagram of a target positioning system based on a mobile terminal and a WiFi probe according to an embodiment of the present invention;
fig. 6 is a block diagram of a target obtaining unit according to an embodiment of the present invention;
fig. 7 is a block diagram of a target address association data obtaining module according to an embodiment of the present invention;
fig. 8 is a block diagram of a target information obtaining module according to an embodiment of the present invention.
Detailed Description
In order to more fully understand the technical content of the present invention, the technical solution of the present invention will be further described and illustrated with reference to the following specific embodiments, but not limited thereto.
As shown in specific embodiments of fig. 1 to 8, the target positioning method based on the mobile terminal and the WiFi probe provided in this embodiment can be applied to a positioning process of a target device, so that a hotspot signal scanned by the mobile terminal and a data packet detected by the WiFi probe are used to position a target, and the target is accurately positioned and has strong expansion capability.
As shown in fig. 1, the present embodiment provides a target positioning method based on a mobile terminal and a WiFi probe, and the method includes:
s1, establishing connection between the mobile terminal and the WiFi probe;
s2, acquiring detection data of the WiFi probe;
and S3, analyzing and processing the detection data to acquire the related information of the target equipment.
For the step S1, the connection between the mobile terminal and the WiFi probe includes two connection modes, namely wireless connection and wired connection, where the wired connection is to connect the WiFi probe and the mobile terminal through an OTG technology; the wireless connection is realized by connecting the WiFi probe with the mobile terminal through the Bluetooth technology. The WIFI probe is connected with the mobile terminal in a wired or wireless mode, detection data are sent to the mobile terminal, the mobile terminal conducts real-time analysis, and a search target is prompted.
For the above step S2, the step of obtaining detection data of the WiFi probe includes a source MAC address, a destination MAC address, and a signal strength, where the MAC address is a media access control, or a physical address and a hardware address, and is used to define a location of the network device, and in the OSI model, a third layer network layer is responsible for an IP address, and a second layer data link layer is responsible for the MAC address. Thus, a host will have a MAC address and each network location will have an IP address specific to it. The WIFI probe is used for detecting WIFI signals and acquiring network equipment with source MAC addresses, target MAC addresses, signal strength and other information. MAC addresses exist in both physical space and network space. To look for wireless MAC address in the physical space, just need to use the WIFI probe, need to make a round trip to search in different physical spaces, the WIFI probe just needs can work in the removal, simultaneously, in order to make the probe signal can be analytic in real time, form the useful show form of searching, just need with the help of mobile terminals such as smart mobile phone.
The WIFI probe should return at least the following probe data, which is expressed in JSON form, for example:
wherein, sourceMac is a source MAC address and is displayed in a character string form; destMac is a destination MAC address and is displayed in a character string form; rssi is the signal strength, shown in digital form.
Further, in some embodiments, regarding the step S3, the step of analyzing the detection data and acquiring the relevant information of the target device includes the following specific steps:
s31, obtaining target address associated data according to the detection data;
and S32, analyzing the signal intensity in the detection data, and acquiring relevant information of the target device by combining the target address.
In some embodiments, for the step S31, the step of deriving the target address association data according to the probe data includes the following specific steps:
s311, searching an address meeting the requirement in the source MAC address to form target address associated data;
s312, judging whether the destination MAC address is a broadcast address;
if yes, go to step S32;
if not, S313 replaces the destination MAC address with the destination MAC address, masks other addresses in the source MAC address, and proceeds to S32.
For the above step S311, the destination MAC address that we need to find is found from the source MAC address, and other MAC addresses are masked, and the relevant information of the destination MAC address is provided to the mobile terminal for processing.
For the above steps S312 to S313, the destination MAC address refers to the address of the destination to which a MAC frame in WIFI is sent; the target address is an address of a target device to be searched, the destination MAC address may be an address of hexadecimal full F (FF: FF), indicating a broadcast address, when the WiFi probe detects that the destination MAC address is a broadcast address, most of the cases are that the target device sends out a probe frame, and the target device wants to acquire the nearby WIFI hotspot information, so as to select a proper device for connection, when the destination address is not a broadcast address, typically the MAC address of another WIFI hotspot device, indicating that the target device is communicating with the WIFI hotspot device, typically a normal connection has been established with the WIFI hotspot device, since the WIFI signal of the WIFI hotspot device is more stable and easier to detect, which is also related to signal strength, therefore, the target needs to be changed from the current target address to the MAC address of the target WIFI hotspot, which can increase the speed of searching the target.
The WIFI probe gives a target MAC address and a WIFI hotspot name (SSID) of the target MAC address, if the WIFI probe does not give information, when the mobile terminal is used, the mobile terminal can also provide the corresponding relation between the target MAC address and the WIFI hotspot name, the WIFI hotspot name is searched through the target MAC address, useful information of the position of a target is possibly found, for example, the hotspot name ROYTEA possibly indicates that a shop, a market, a company or other organizations named ROYTEA provide a WIFI hotspot for a target device to use, and at the moment, a map of the mobile terminal can be used for searching for the ROYTEA nearby, so that the target can be found.
Further, in some embodiments, the step of S32, analyzing the signal strength in the probe data, and obtaining the information related to the target device by combining the target address, includes the following specific steps:
s321, calculating the distance between the target address and the mobile terminal according to the signal intensity;
s322, acquiring the hotspot name and the target address position according to the distance and the target address associated data.
For the above steps S321 to S322, the received signal strength is displayed according to the time of the received probe information to determine the distance. In an ideal open area, the signal strength is exponential with distance, and the distance increases by a factor when the signal strength is linearly attenuated. The signal strength is also related to the power of the transmitting source. The more powerful the source emits a stronger signal. The signal strength is also related to the antenna. The larger the gain of the antenna, the stronger the signal strength in the gain direction. The signal strength and the stability thereof are also related to the processing mode of the transmitting device, and the WIFI hotspots are usually connected with a power supply, need to provide WIFI services to the surroundings at any time, and often have stronger and more stable signal strength. Mobile terminals are generally battery powered and may change location from time to time, and may adjust transmit power continuously to conserve power, which may be weak in signal strength and stability, and may interrupt signal transmission when not in use. According to the current WIFI related standard IEEE802.11, WIFI signals mainly work in 2.4GHz and 5.8GHz frequency bands, which are easily interfered by the nearby environment, so that the signal strength is quickly weakened. For example, cement buildings, walls, human bodies, etc. can block, absorb or reflect signals in these frequency bands, thereby affecting the received signal strength.
The relation between the time and the target signal strength (or the distance) is mainly displayed by a chart expressing a two-dimensional data relation such as a bar chart and a line chart, a searcher can visually see the relation so as to conveniently find the position closest to the target, the target equipment which is closest to the target and has the strongest signal is obtained through the chart to carry out positioning connection, the MAC address and the hotspot name of the hotspot connected with the target equipment are directly displayed so as to conveniently identify the hotspot belonged person (such as shops, markets, hotels, companies and the like) of the target equipment in reality, and the tracked target can be conveniently changed into the hotspot MAC address so as to obtain a more stable signal and search the signal.
In some embodiments, the appearance of the target device and the distance between the target device and the seeker is prompted by voice, vibration, frequency tone, screen notification, and the like, so that the seeker is prevented from missing the target device and being focused on the position where the prompt appears to conduct deep and careful searching.
According to the target positioning method based on the mobile terminal and the WiFi probe, the mobile terminal and the WiFi probe connected with the mobile terminal are arranged, the target MAC address and the signal strength of the target equipment are obtained after analysis and processing are carried out on the detection data fed back by the WiFi probe through the mobile terminal, the target equipment is positioned, and the target positioning is carried out by combining the target MAC address, the target name and the signal strength, so that the hot spot signal scanned by the mobile terminal and the data packet detected by the WiFi probe are realized, the position of the target is positioned, and the positioning is accurate and the expansion capability is strong.
As shown in fig. 5, the present embodiment further provides a target positioning system based on a mobile terminal and a WiFi probe, which includes a connection establishing unit 1, a probe data acquiring unit 2, and a target acquiring unit 3.
And the connection establishing unit 1 is used for establishing the connection between the mobile terminal and the WiFi probe.
And the detection data acquisition unit 2 is used for acquiring the detection data of the WiFi probe.
And the target acquisition unit 3 is used for analyzing and processing the detection data and acquiring the related information of the target equipment.
For the connection establishing unit 1, the mobile terminal and the WiFi probe are connected in two ways, namely wireless connection and wired connection, and the wired connection is to connect the WiFi probe and the mobile terminal through an OTG technology; the wireless connection is realized by connecting the WiFi probe with the mobile terminal through the Bluetooth technology. The WIFI probe is connected with the mobile terminal in a wired or wireless mode, detection data are sent to the mobile terminal, the mobile terminal conducts real-time analysis, and a search target is prompted.
For the above-mentioned detection data obtaining unit 2, the related detection data includes a source MAC address, a destination MAC address and a signal strength, the MAC address is a media access control, or called a physical address and a hardware address, and is used to define the location of the network device, in the OSI model, a third layer network layer is responsible for an IP address, and a second layer data link layer is responsible for the MAC address. Thus, a host will have a MAC address and each network location will have an IP address specific to it. The WIFI probe is used for detecting WIFI signals and acquiring network equipment with source MAC addresses, target MAC addresses, signal strength and other information. MAC addresses exist in both physical space and network space. To look for wireless MAC address in the physical space, just need to use the WIFI probe, need to make a round trip to search in different physical spaces, the WIFI probe just needs can work in the removal, simultaneously, in order to make the probe signal can be analytic in real time, form the useful show form of searching, just need with the help of mobile terminals such as smart mobile phone.
The WIFI probe should return at least the following probe data, which is expressed in JSON form, for example:
wherein, sourceMac is a source MAC address and is displayed in a character string form; destMac is a destination MAC address and is displayed in a character string form; rssi is the signal strength, shown in digital form.
In addition, in some embodiments, the target obtaining unit 3 includes a target address association data obtaining module 31 and a target information obtaining module 32.
And a target address associated data obtaining module 31, configured to obtain target address associated data according to the detection data.
And the target information acquisition module 32 is configured to analyze the signal strength in the detection data and acquire information related to the target device by combining the target address.
Further, the target address associated data obtaining module 31 includes a target address associated data forming sub-module 311, a determining sub-module 312 and an updating sub-module 313.
And the destination address associated data forming submodule 311 is configured to find an address meeting the requirement in the source MAC address, and form destination address associated data.
The determining sub-module 312 is configured to determine whether the destination MAC address is a broadcast address.
And an update submodule 313, configured to replace the destination MAC address with the destination address if the destination MAC address is not the same as the destination MAC address.
For the destination address forming sub-module 311, the destination MAC address that we need to find is found from the source MAC address, and other MAC addresses are masked, and the related information of the destination MAC address is provided to the mobile terminal for processing.
The destination MAC address refers to the address of a destination to which a MAC frame of WIFI is sent; the target address is an address of a target device to be searched, the destination MAC address may be an address of hexadecimal full F (FF: FF), indicating a broadcast address, when the WiFi probe detects that the destination MAC address is a broadcast address, most of the cases are that the target device sends out a probe frame, and the target device wants to acquire the nearby WIFI hotspot information, so as to select a proper device for connection, when the destination address is not a broadcast address, typically the MAC address of another WIFI hotspot device, indicating that the target device is communicating with the WIFI hotspot device, typically a normal connection has been established with the WIFI hotspot device, since the WIFI signal of the WIFI hotspot device is more stable and easier to detect, which is also related to signal strength, therefore, the target needs to be changed from the current target address to the MAC address of the target WIFI hotspot, which can increase the speed of searching the target.
The WIFI probe gives a target MAC address and a WIFI hotspot name (SSID) of the target MAC address, if the WIFI probe does not give information, when the mobile terminal is used, the mobile terminal can also provide the corresponding relation between the target MAC address and the WIFI hotspot name, the WIFI hotspot name is searched through the target MAC address, useful information of the position of a target is possibly found, for example, the hotspot name ROYTEA possibly indicates that a shop, a market, a company or other organizations named ROYTEA provide a WIFI hotspot for a target device to use, and at the moment, a map of the mobile terminal can be used for searching for the ROYTEA nearby, so that the target can be found.
Further, in some embodiments, the target information obtaining module 32 includes a distance calculating sub-module 321 and an information obtaining sub-module 322.
And the distance calculating submodule 321 is configured to calculate a distance between the target address and the mobile terminal according to the signal strength.
And an information obtaining sub-module 322, configured to obtain the hotspot name and the target address location according to the distance and the target address association data.
And displaying the received signal strength according to the time of the received detection information so as to judge the distance. In an ideal open area, the signal strength is exponential with distance, and the distance increases by a factor when the signal strength is linearly attenuated. The signal strength is also related to the power of the transmitting source. The more powerful the source emits a stronger signal. The signal strength is also related to the antenna. The larger the gain of the antenna, the stronger the signal strength in the gain direction. The signal strength and the stability thereof are also related to the processing mode of the transmitting device, and the WIFI hotspots are usually connected with a power supply, need to provide WIFI services to the surroundings at any time, and often have stronger and more stable signal strength. Mobile terminals are generally battery powered and may change location from time to time, and may adjust transmit power continuously to conserve power, which may be weak in signal strength and stability, and may interrupt signal transmission when not in use. According to the current WIFI related standard IEEE802.11, WIFI signals mainly work in 2.4GHz and 5.8GHz frequency bands, which are easily interfered by the nearby environment, so that the signal strength is quickly weakened. For example, cement buildings, walls, human bodies, etc. can block, absorb or reflect signals in these frequency bands, thereby affecting the received signal strength.
The relation between the time and the target signal strength (or the distance) is mainly displayed by a chart expressing a two-dimensional data relation such as a bar chart and a line chart, a searcher can visually see the relation so as to conveniently find the position closest to the target, the target equipment which is closest to the target and has the strongest signal is obtained through the chart to carry out positioning connection, the MAC address and the hotspot name of the hotspot connected with the target equipment are directly displayed so as to conveniently identify the hotspot belonged person (such as shops, markets, hotels, companies and the like) of the target equipment in reality, and the tracked target can be conveniently changed into the hotspot MAC address so as to obtain a more stable signal and search the signal.
In some embodiments, the appearance of the target device and the distance between the target device and the seeker is prompted by voice, vibration, frequency tone, screen notification, and the like, so that the seeker is prevented from missing the target device and being focused on the position where the prompt appears to conduct deep and careful searching.
For the target positioning system based on the mobile terminal and the WiFi probe, the mobile terminal and the WiFi probe connected with the mobile terminal are arranged, the target MAC address and the signal strength of the target equipment are obtained after analysis and processing are carried out on the mobile terminal according to detection data fed back by the WiFi probe, the target equipment is positioned, and target positioning is carried out by combining the target MAC address, the target name and the signal strength, so that a hotspot signal scanned by the mobile terminal and a data packet detected by the WiFi probe are realized, the position of a target is positioned, and the positioning is accurate and the expansion capability is strong.
The technical contents of the present invention are further illustrated by the examples only for the convenience of the reader, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation based on the present invention is protected by the present invention. The protection scope of the invention is subject to the claims.
Claims (2)
1. A target positioning method based on a mobile terminal and a WiFi probe is characterized by comprising the following steps:
establishing connection between the mobile terminal and the WiFi probe;
acquiring detection data of a WiFi probe;
analyzing and processing the detection data to obtain relevant information of the target equipment;
acquiring detection data of a WiFi probe, wherein the detection data comprises a source MAC address, a destination MAC address and signal intensity;
the method comprises the following steps of analyzing and processing the detection data to obtain the relevant information of the target equipment:
obtaining target address associated data according to the detection data;
analyzing the signal intensity in the detection data, and acquiring related information of the target equipment by combining a target address;
the step of obtaining the target address associated data according to the detection data comprises the following specific steps:
searching an address meeting the requirement in the source MAC address to form target address associated data;
judging whether the target MAC address is a broadcast address;
if so, analyzing the signal intensity in the detection data, and acquiring related information of the target equipment by combining a target address;
if not, replacing the target address with the destination MAC address, shielding other addresses in the source MAC address, analyzing the signal intensity in the detection data, and acquiring related information of the target equipment by combining the target address;
the method comprises the following steps of analyzing the signal intensity in the detection data and acquiring the related information of the target equipment by combining a target address:
calculating the distance between the target address and the mobile terminal according to the signal intensity;
and acquiring the hotspot name and the target address position according to the distance and the target address associated data.
2. The target positioning system based on the mobile terminal and the WiFi probe is characterized by comprising a connection establishing unit, a detection data acquiring unit and a target acquiring unit;
the connection establishing unit is used for establishing the connection between the mobile terminal and the WiFi probe;
the detection data acquisition unit is used for acquiring detection data of the WiFi probe;
the target acquisition unit is used for analyzing and processing the detection data and acquiring related information of the target equipment;
the target acquisition unit comprises a target address associated data acquisition module and a target information acquisition module;
the target address associated data obtaining module is used for obtaining target address associated data according to the detection data;
the target information acquisition module is used for analyzing the signal intensity in the detection data and acquiring the related information of the target equipment by combining a target address;
the target address associated data obtaining module comprises a target address associated data forming submodule, a judging submodule and an updating submodule;
the target address associated data forming submodule is used for searching an address meeting the requirements in the source MAC address to form target address associated data;
the judgment submodule is used for judging whether the target MAC address is a broadcast address;
the updating submodule is used for replacing the target address with the destination MAC address and shielding other addresses in the source MAC address if the source MAC address is not the target address;
the target information acquisition module comprises a distance calculation submodule and an information acquisition submodule;
the distance calculation submodule is used for calculating the distance between the target address and the mobile terminal according to the signal intensity;
and the information acquisition submodule is used for acquiring the hotspot name and the target address position according to the distance and the target address associated data.
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