CN104933557B - A kind of method and system for preventing POS machine strange land from trading - Google Patents

A kind of method and system for preventing POS machine strange land from trading Download PDF

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Publication number
CN104933557B
CN104933557B CN201510336910.1A CN201510336910A CN104933557B CN 104933557 B CN104933557 B CN 104933557B CN 201510336910 A CN201510336910 A CN 201510336910A CN 104933557 B CN104933557 B CN 104933557B
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pos machine
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initial
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CN104933557A (en
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张炽成
许剑锋
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Fujian Landi Commercial Equipment Co Ltd
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Fujian Landi Commercial Equipment Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q20/00—Payment architectures, schemes or protocols
    • G06Q20/08—Payment architectures
    • G06Q20/20—Point-of-sale [POS] network systems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q20/00—Payment architectures, schemes or protocols
    • G06Q20/30—Payment architectures, schemes or protocols characterised by the use of specific devices or networks
    • G06Q20/32—Payment architectures, schemes or protocols characterised by the use of specific devices or networks using wireless devices
    • G06Q20/322—Aspects of commerce using mobile devices [M-devices]
    • G06Q20/3224—Transactions dependent on location of M-devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q20/00—Payment architectures, schemes or protocols
    • G06Q20/38—Payment protocols; Details thereof
    • G06Q20/382—Payment protocols; Details thereof insuring higher security of transaction
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q20/00—Payment architectures, schemes or protocols
    • G06Q20/38—Payment protocols; Details thereof
    • G06Q20/40—Authorisation, e.g. identification of payer or payee, verification of customer or shop credentials; Review and approval of payers, e.g. check credit lines or negative lists
    • G06Q20/405—Establishing or using transaction specific rules

Abstract

The present invention provides a kind of method and system for preventing POS machine strange land from trading, the methods are as follows: presets the initial position message of POS machine and storage；According to the initial position message, POS machine scanning wireless aps simultaneously obtain initial AP list, storing initial AP list；POS machine scanning wireless aps simultaneously obtain current AP list, store current AP list；Default AP list similarity threshold values, the similarity of more current AP list and initial AP list；If similarity is more than or equal to AP list similarity threshold values, allows to carry out POS transaction and otherwise obtain the current location information of POS machine and storage；Default moving distance threshold values, compares the current location information of POS machine at a distance from initial position message；If distance is less than moving distance threshold values, allow to carry out POS transaction, otherwise, does not allow to carry out POS transaction.Simplify the process of POS machine credit card transaction, improves user experience.

Description

A kind of method and system for preventing POS machine strange land from trading
Technical field
The present invention relates to a kind of payment management method, in particular to a kind of method and system for preventing POS machine strange land from trading.
Background technique
The operation address that Unionpay provides that POS machine must apply in trade company uses.It is only quilt if it were not for being used in applied address It is considered as strange land use, even the trade company's use for taking adjacent compartment also belongs to strange land use.But in existing transaction flow, There is no a kind of reliable technological means to detect whether POS terminal is that strange land uses.Therefore, many criminals apply for POS Virtual trading is carried out in strange land after machine, carries out the illegal activities such as the illegal arbitrage of signal card for other people.
The method for preventing POS machine from carrying out strange land transaction at present mainly has POS machine Geographic mapping and Unionpay side to reinforce prison Pipe.POS machine Geographic mapping needs and network interaction, needs first to acquire current base station information in use process, retransmit It is inquired to server, latitude and longitude information is then returned to by server.If all carrying out POS machine geographical location before transaction every time Positioning will increase complexity and the processing time of transaction flow, impact to user experience.Reinforce supervision in Unionpay side Reinforce the supervision to the POS machine that the single amount of money is small, stroke count is more, total amount is big in a short time, discovery similar situation can notify POS in time The supervision department of machine application ground and bank card ownership place, which combines, to be checked, and is not only needed to put into a large amount of manpower but also is generated big Measure extra work, it is also possible to which erroneous judgement takes time and effort and low efficiency.
The patent of invention of Publication No. CN102819798A, which discloses one kind the POS is prevented to be moved to strange land, trades Method, first the preset position information of the preset POS, then obtains working as the POS by wireless communication networks server Front position information, finally according to the current location information and preset position information whether be consistent judge the POS whether be Strange land transaction.The method obtains the location information of the POS, transaction by transaction message or wireless network server Message will increase complexity and the processing time of transaction flow, inevitably impact to user experience；In addition, it is necessary to It just can be carried out after wireless network connection and judge whether it is strange land transaction, and the positioning accuracy of single wireless communication network is limited, The POS cannot be entirely prevented to carry out strange land transaction.
Summary of the invention
The technical problems to be solved by the present invention are: providing, a kind of precision is high, recognition speed is fast prevents POS machine strange land from handing over Easy method and system.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A method of prevent POS machine strange land from trading, the method are as follows:
Preset the initial position message of POS machine and storage；According to the initial position message, POS machine scans wireless aps And initial AP list is obtained, storing initial AP list；
POS machine scanning wireless aps simultaneously obtain current AP list, store current AP list；
Default AP list similarity threshold values, the similarity of more current AP list and initial AP list；
If similarity is more than or equal to AP list similarity threshold values, allow to carry out POS transaction；
If similarity is less than AP list similarity threshold values, the current location information of POS machine and storage are obtained；
Default moving distance threshold values, compares the current location information of POS machine at a distance from initial position message；
If distance is less than moving distance threshold values, allow to carry out POS transaction；If distance is more than or equal to moving distance threshold values, Do not allow then to carry out POS transaction.
The beneficial effects of the present invention are: by the wireless aps around POS machine are scanned obtain initial AP list and Current AP list, and it is inferred to whether POS machine is in strange land by comparing the similarity of initial AP list and current AP list；If The similarity of initial AP list and current AP list does not reach preset AP list similarity threshold values, then enables location information and sentence Whether disconnected POS machine is in strange land；In connection wireless network and the shape for being not connected to wireless network before POS machine carries out credit card transaction Whether the detectable POS machine of state is located at strange land, to simplify the process of POS machine credit card transaction, reduce POS machine credit card transaction when Between, improve user experience.
A kind of system for preventing POS machine strange land from trading, comprising:
Memory module is used for storing initial AP list, current AP list, initial position message, current location information；
Scan module, for scanning wireless aps；
Module is obtained, for obtaining initial AP list and current AP list；
Comparison module for comparing the similarity of current AP list Yu initial AP list, and compares the present bit of POS machine Confidence ceases at a distance from initial position message；
Module is obtained, for obtaining the current location information of POS machine.
The beneficial effects of the present invention are: information is stored by memory module, wireless aps are scanned by scan module, are passed through It obtains module and obtains AP list, by comparing the more initial and current AP list of module and location information, by obtaining mould Block obtains location information, and the information that scan module, acquisition module, acquisition module obtain stores in a storage module and by comparing mould Block is compared analysis, structurally reasonable, guarantees the trackability and reliability of data processing.
Detailed description of the invention
Fig. 1 is the flow chart of the method for preventing POS machine strange land from trading of the invention；
Fig. 2 is the structural schematic diagram of the system for preventing POS machine strange land from trading of the invention；
Fig. 3 is the structural schematic diagram of the system for preventing POS machine strange land from trading of the invention；
Fig. 4 is the structural schematic diagram of the system for preventing POS machine strange land from trading of the invention.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and cooperate attached Figure is explained.
The most critical design of the present invention is: can be by scanning POS machine in the state that POS machine does not connect wireless network The wireless aps of surrounding obtain AP list, by being to judge POS machine to the similarity-rough set of initial AP list and current AP list It is no to judge that POS machine is by the location information to POS machine if similarity does not reach certain preset value in strange land It is no to be in strange land, the judgement for whether being in strange land to POS machine is completed before POS is traded, and is simplified transaction flow, is reduced and hand over The easy time enhances user experience.
Explanation of technical terms of the present invention is shown in Table 1:
Table 1
A specific embodiment of the invention are as follows:
Fig. 1 is please referred to, a method of prevent POS machine strange land from trading, the method are as follows:
Preset the initial position message of POS machine and storage；According to the initial position message, POS machine scans wireless aps And initial AP list is obtained, storing initial AP list；
POS machine scanning wireless aps simultaneously obtain current AP list, store current AP list；
Default AP list similarity threshold values, the similarity of more current AP list and initial AP list；
If similarity is more than or equal to AP list similarity threshold values, allow to carry out POS transaction；
If similarity is less than AP list similarity threshold values, the current location information of POS machine and storage are obtained；
Default moving distance threshold values, compares the current location information of POS machine at a distance from initial position message；
If distance is less than moving distance threshold values, allow to carry out POS transaction；If distance is more than or equal to moving distance threshold values, Do not allow then to carry out POS transaction.
As can be seen from the above description, the beneficial effects of the present invention are: it is obtained by being scanned to the wireless aps around POS machine Initial AP list and current AP list are obtained, and is inferred to POS machine by comparing the similarity of initial AP list and current AP list Whether strange land is in；If the similarity of initial AP list and current AP list does not reach preset AP list similarity threshold values, It then enables location information and judges whether POS machine is in strange land；In connection wireless network and not before POS machine carries out credit card transaction Whether the detectable POS machine of state for connecting wireless network is located at strange land, to simplify the process of POS machine credit card transaction, reduces The time of POS machine credit card transaction improves user experience.
Further, the similarity of more current AP list and initial AP list, specifically:
According to the initial position message, POS machine scans wireless aps, and the wireless aps scanned combination is obtained initial AP List, and record the quantity N1 of wireless aps in initial AP list；
POS machine scans wireless aps in current geographical location, and the wireless aps scanned combination is obtained current AP list, And record the quantity N2 of wireless aps in current AP list；
Relatively and the quantity N3 of identical wireless aps in current AP list and initial AP list is recorded, with the ratio of N3 and N1 Calculate the similarity S of current AP list Yu initial AP list.
Seen from the above description, initial AP list and current AP are obtained by being scanned to the wireless aps around POS machine List passes through identical wireless aps quantity in initial AP list and current AP list and the wireless aps quantity in initial AP list Similarity is calculated, POS machine is not necessarily to connect i.e. the similarity that can determine whether current AP list Yu initial AP list with wireless aps, POS machine can determine whether POS machine is in strange land before carrying out credit card transaction, simplify the transaction flow of POS machine.
Further, the similarity of more current AP list and initial AP list, specifically:
The corresponding geographical location of the initial position message is equipped with an original wireless AP；
POS machine scans wireless aps, and is ranked up to the wireless aps scanned: before original wireless AP is come most, remaining Wireless aps are successively ranked up by signal strength；
The wireless aps to have sorted combination is obtained into initial AP list, and records the quantity N1 of wireless aps in initial AP list；
POS machine scans wireless aps in current geographical location, and is ranked up to the wireless aps scanned: if scanning is arrived Original wireless AP, then before coming original wireless AP most, remaining wireless aps is successively ranked up by signal strength；If not scanning To original wireless AP, then all wireless aps are successively ranked up by signal strength；
The wireless aps to have sorted combination is obtained into current AP list, and records the quantity N2 of wireless aps in current AP list；
If before original wireless AP comes most, then the similarity is set as peak in current AP list；
If relatively and to record current AP list identical with initial AP list without original wireless AP in current AP list The quantity N3 of wireless aps, with the similarity S of the ratio calculation of N3 and N1 current AP list and initial AP list.
Seen from the above description, the original wireless AP is the corresponding geographical position of initial position message for being mounted on POS machine The wireless aps at place are set, original wireless AP is the wireless aps bound with POS machine, original by that whether can scan to POS machine first Wireless aps judge whether POS machine is in strange land, whether judge POS machine secondly by other wireless aps around POS machine In strange land, operating process is simple, simplifies the transaction flow of POS machine.
Further, with the similarity S of the ratio calculation of N3 and N1 current AP list and initial AP list, specifically:
S=N3*100/N1.
Seen from the above description, the phase of current AP list Yu initial AP list is obtained multiplied by 100 with the ratio of N3 and N1 Like degree, the integer value that can be converted similarity in 0~100 simplifies computer so that computer-internal program be facilitated to handle The complexity of internal processes processing, improves efficiency.
Further, AP list similarity threshold values is preset, specifically:
In some cycles, relatively and POS machine is traded every time in n times POS transaction current AP list and initial AP are recorded The similarity S of listi, i=1,2 ..., N take N number of SiIn greater than 0 minimum similarity degree as AP list similarity threshold values.
Seen from the above description, in some cycles, current AP list is compared with the similarity of initial AP list It calculates, selects reasonable numerical value as similarity threshold values in the similarity value greater than 0, data usability is strong.
Further, if similarity is more than or equal to AP list similarity threshold values, allow to carry out POS transaction, and POS machine It include initial position message in the transaction message of transmission.
Seen from the above description, if similarity is more than or equal to AP list similarity threshold values, it can determine whether out that POS machine is located at just At beginning position, the transaction message that POS machine is sent is transaction certificate, and it is initial position that loco can be specified in transaction message, POS machine carries out that the judgement to POS machine location information can be saved when credit card transaction, simplifies POS machine transaction flow, when reducing transaction Between, improve user experience.
Further, moving distance threshold values is preset, specifically:
The maximum moving distance that measurement POS machine allows relative to initial position message, the maximum moving distance of the permission As moving distance threshold values.
Seen from the above description, the setting of initial position message and the setting of moving distance threshold values are carried out by Unionpay side, Make data that there is availability and authority.
Please refer to Fig. 1, the embodiment of the present invention one are as follows:
A method of prevent POS machine strange land from trading, the method are as follows:
Preset the initial position message of POS machine and storage；According to the initial position message, POS machine scans wireless aps And initial AP list is obtained, storing initial AP list；
POS machine scanning wireless aps simultaneously obtain current AP list, store current AP list；
Default AP list similarity threshold values, specifically:
Within three day time, relatively and POS machine is traded every time in n times POS transaction current AP list and initial AP are recorded The similarity S of listi, i=1,2 ..., N take N number of SiIn be greater than 0 minimum similarity degree, if be 5%, converted 5%: 5%*100=5, using the numerical value 5 obtained after transformation as AP list similarity threshold values；
Compare the similarity of current AP list Yu initial AP list, specifically:
According to the initial position message, POS machine scans wireless aps, and the wireless aps scanned combination is obtained initial AP List, and record the quantity N1 of wireless aps in initial AP list；
POS machine scans wireless aps in current geographical location, and the wireless aps scanned combination is obtained current AP list, And record the quantity N2 of wireless aps in current AP list；
Relatively and the quantity N3 of identical wireless aps in current AP list and initial AP list is recorded, with the ratio of N3 and N1 The similarity S for calculating current AP list and initial AP list multiplied by 100, specifically: S=N3*100/N1, the number of obtained S Being worth range is 0~100；
If similarity is more than or equal to AP list similarity threshold values 5, allow to carry out POS transaction；
If similarity is less than AP list similarity threshold values 5, the current location information of POS machine and storage are obtained；
Default moving distance threshold values, specifically: measurement POS machine relative to initial position message allows it is maximum move away from From, the maximum moving distance of the permission is moving distance threshold values, if it is 20m；
Compare the current location information of POS machine at a distance from initial position message；
If distance is less than moving distance threshold values 20m, allow to carry out POS transaction；If distance is more than or equal to moving distance valve Value 20m does not allow then to carry out POS transaction.
Referring to figure 2., a kind of system for preventing POS machine strange land from trading, comprising:
Memory module is used for storing initial AP list, current AP list, initial position message, current location information；
Scan module, for scanning wireless aps；
Module is obtained, for obtaining initial AP list and current AP list；
Comparison module for comparing the similarity of current AP list Yu initial AP list, and compares the present bit of POS machine Confidence ceases at a distance from initial position message；
Module is obtained, for obtaining the current location information of POS machine.
As can be seen from the above description, the beneficial effects of the present invention are: information is stored by memory module, passes through scan module Wireless aps are scanned, AP list are obtained by obtaining module, by comparing the more initial and current AP list of module and position Information obtains location information by obtaining module, and the information that scan module, acquisition module, acquisition module obtain is stored in storage It is compared analysis in module and by comparison module, it is structurally reasonable, guarantee the trackability and reliability of data processing.
Referring to figure 3., further, including POS machine, the memory module and comparison module are respectively positioned in POS machine, POS machine further includes Wi-Fi module and LBS information module, and the Wi-Fi module includes scan module, obtains module, the LBS Information module includes obtaining module, and the Wi-Fi module and LBS information module are connect with the host CPU of POS machine.
Seen from the above description, scanning wireless aps can be realized with AP list is obtained by Wi-Fi module, obtain location information It can be realized by LBS information module, memory module and comparison module are respectively positioned in POS machine, and Wi-Fi module and LBS information module are equal There is certain application foundation, brief system development time, simplied system structure.
It referring to figure 4., further, further include POS trading server, the memory module and comparison module are respectively positioned on In POS trading server.
Seen from the above description, memory module and comparison module, which are respectively positioned in POS trading server, makes data more have the right Prestige is easy to implement the supervision of Unionpay side.
Referring to figure 4., the embodiment of the present invention two are as follows:
A kind of system for preventing POS machine strange land from trading, comprising:
Memory module is used for storing initial AP list, current AP list, initial position message, current location information；
Scan module, for scanning wireless aps；
Module is obtained, for obtaining initial AP list and current AP list；
Comparison module for comparing the similarity of current AP list Yu initial AP list, and compares the present bit of POS machine Confidence ceases at a distance from initial position message；
Module is obtained, for obtaining the current location information of POS machine.
The system also includes POS machine and POS trading server, POS machine further includes Wi-Fi module and LBS information module, The scan module and acquisition module are located in Wi-Fi module, and the acquisition module is located in LBS information module, and described deposits Storage module and comparison module are respectively positioned in POS trading server.
In conclusion the method and system provided by the invention for preventing POS machine strange land from trading, around POS machine Initial AP list and the similarity of current AP list be inferred to whether POS machine is in strange land；If initial AP list and current AP The similarity of list does not reach preset AP list similarity threshold values, then enables location information and judge whether POS machine is in different Ground；It is with the detectable POS machine of state for being not connected to wireless network in connection wireless network before POS machine carries out credit card transaction It is no to be located at strange land, to simplify the process of POS machine credit card transaction, the time of POS machine credit card transaction is reduced, improves user experience.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, similarly include In scope of patent protection of the invention.

Claims (8)

1. a kind of method for preventing POS machine strange land from trading, which is characterized in that the method are as follows:
Preset the initial position message of POS machine and storage；According to the initial position message, POS machine scanning wireless aps are simultaneously obtained Obtain initial AP list, storing initial AP list；
POS machine scanning wireless aps simultaneously obtain current AP list, store current AP list；
Default AP list similarity threshold values, the similarity of more current AP list and initial AP list；
If similarity is more than or equal to AP list similarity threshold values, allow to carry out POS transaction；
If similarity is less than AP list similarity threshold values, the current location information of POS machine and storage are obtained；
Default moving distance threshold values, compares the current location information of POS machine at a distance from initial position message；
If distance is less than moving distance threshold values, allow to carry out POS transaction；If distance is more than or equal to moving distance threshold values, no Allow to carry out POS transaction；
Wherein, the similarity of more current AP list and initial AP list, specifically:
The corresponding geographical location of the initial position message is equipped with an original wireless AP；
POS machine scans wireless aps, and is ranked up to the wireless aps scanned: before original wireless AP is come most, remaining is wireless AP is successively ranked up by signal strength；
The wireless aps to have sorted combination is obtained into initial AP list, and records the quantity N1 of wireless aps in initial AP list；
POS machine scans wireless aps in current geographical location, and is ranked up to the wireless aps scanned: if scanning to original Wireless aps, then before coming original wireless AP most, remaining wireless aps is successively ranked up by signal strength；If not scanning original All wireless aps are then successively ranked up by beginning wireless aps by signal strength；
The wireless aps to have sorted combination is obtained into current AP list, and records the quantity N2 of wireless aps in current AP list；
If before original wireless AP comes most, then the similarity is set as peak in current AP list；
If relatively and being recorded identical wireless in current AP list and initial AP list without original wireless AP in current AP list The quantity N3 of AP, with the similarity S of the ratio calculation of N3 and N1 current AP list and initial AP list.
2. the method according to claim 1 for preventing POS machine strange land from trading, which is characterized in that with the radiometer of N3 and N1 The similarity S of current AP list Yu initial AP list is calculated, specifically:
S=N3*100/N1.
3. the method according to claim 1 for preventing POS machine strange land from trading, which is characterized in that default AP list similarity Threshold values, specifically:
In some cycles, relatively and the current AP list and initial AP list of POS machine transaction every time in n times POS transaction is recorded Similarity Si, i=1,2 ..., N take N number of SiIn greater than 0 minimum similarity degree as AP list similarity threshold values.
4. the method according to claim 1 for preventing POS machine strange land from trading, which is characterized in that if similarity is more than or equal to AP list similarity threshold values then allows to carry out POS transaction, and includes initial position message in the transaction message of POS machine transmission.
5. the method according to claim 1 for preventing POS machine strange land from trading, which is characterized in that default moving distance threshold values, Specifically:
The maximum moving distance that measurement POS machine allows relative to initial position message, the maximum moving distance of the permission are Moving distance threshold values.
6. a kind of system for preventing POS machine strange land from trading characterized by comprising
Memory module is used for storing initial AP list, current AP list, initial position message, current location information；
Scan module, for scanning wireless aps；
Module is obtained, for obtaining initial AP list and current AP list；
Comparison module for comparing the similarity of current AP list Yu initial AP list, and compares the present bit confidence of POS machine Breath is at a distance from initial position message；
Module is obtained, for obtaining the current location information of POS machine；
The similarity of the comparison current AP list and initial AP list specifically:
The corresponding geographical location of the initial position message is equipped with an original wireless AP；
POS machine scans wireless aps, and is ranked up to the wireless aps scanned: before original wireless AP is come most, remaining is wireless AP is successively ranked up by signal strength；
The wireless aps to have sorted combination is obtained into initial AP list, and records the quantity N1 of wireless aps in initial AP list；
POS machine scans wireless aps in current geographical location, and is ranked up to the wireless aps scanned: if scanning to original Wireless aps, then before coming original wireless AP most, remaining wireless aps is successively ranked up by signal strength；If not scanning original All wireless aps are then successively ranked up by beginning wireless aps by signal strength；
The wireless aps to have sorted combination is obtained into current AP list, and records the quantity N2 of wireless aps in current AP list；
If before original wireless AP comes most, then the similarity is set as peak in current AP list；
If relatively and being recorded identical wireless in current AP list and initial AP list without original wireless AP in current AP list The quantity N3 of AP, with the similarity S of the ratio calculation of N3 and N1 current AP list and initial AP list.
7. the system according to claim 6 for preventing POS machine strange land from trading, which is characterized in that described including POS machine Memory module and comparison module are respectively positioned in POS machine, and POS machine further includes Wi-Fi module and LBS information module, the Wi-Fi mould Block includes scan module, obtains module, and the LBS information module includes obtaining module, the Wi-Fi module and LBS information mould Block is connect with the host CPU of POS machine.
8. the system according to claim 6 for preventing POS machine strange land from trading, which is characterized in that further include POS transactional services Device, the memory module and comparison module are respectively positioned in POS trading server.
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