CN104540218B - A kind of WIFI signal validity filter method - Google Patents
A kind of WIFI signal validity filter method Download PDFInfo
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- CN104540218B CN104540218B CN201410809070.1A CN201410809070A CN104540218B CN 104540218 B CN104540218 B CN 104540218B CN 201410809070 A CN201410809070 A CN 201410809070A CN 104540218 B CN104540218 B CN 104540218B
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
- H04L45/7453—Address table lookup; Address filtering using hashing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
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- Computer Networks & Wireless Communication (AREA)
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- Mobile Radio Communication Systems (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The present invention relates to wireless communication technology fields, and in particular to a kind of WIFI signal validity filter method.The following steps are included: S1: by all sample point data reincarnations in a source WIFI at a wireless signal index queue, index is the distance of two sampled points, index value is two sampled point signal strength equal probabilities, S2: the moment of inertia of wireless signal index queue is calculated, S3: setting the moment of inertia threshold value, and the moment of inertia≤the moment of inertia threshold value wireless signal is retained in during index lines up, the moment of inertia > the moment of inertia threshold value wireless signal is lined up into middle rejecting from index.This method removes the bigger WIFI signal of queue the moment of inertia before executing localization method, can effectively remove a wide range of and mobile WIFI, improves the precision of subsequent WIFI positioning.
Description
Technical field
The present invention relates to wireless communication technology fields, and in particular to a kind of WIFI signal validity filter method.
Background technique
In the indoor environment of no GPS signal, the focal issue that effective position is location application field how is carried out,
There is important value in the fields such as LBS, indoor navigation.Due in modern city WIFI it is universal, positioned using WIFI signal
It is a kind of universal and effective method, because there is WIFI signal MAC ID not repeat, the limited (WIFI of signal cover
Information source, effective range are usually no more than 100 meters) the characteristics of, so that being estimated by the WIFI signal that WIFI equipment receives
The method of position can obtain the positioning accuracy within 100 meters.However, starting to occur a wide range of with the development of WIFI equipment
WIFI and mobile WIFI: typical a wide range of WIFI such as megastore in public WIFI, campus WIFI, or the operation such as mobile
The cell WIFI that quotient provides even city WIFI, only one MAC ID but coverage area is very wide, therefore utilize this kind of big model
It is also very wide to enclose the Probability Area range that WIFI signal progress positioning estimation obtains, positioning accuracy is caused to decline；It is typical mobile
WIFI has special mobile WIFI equipment and mobile phone hot spot shared etc., since the position of WIFI information source is not fixed, basis
This kind of WIFI signal carries out positioning and is likely to cause very big position error.Due to affected by environment, it is often as complexity and builds
The signal strength that building structure causes some sources WIFI to receive in multiple and different reception places be it is identical, it is such to position
Change the raising that the insensitive source WIFI is also unfavorable for position positioning accuracy.
Therefore in order to improve the precision that WIFI is positioned, need to judge WIFI signal to the validity of locating effect, the present invention
To increase WIFI positioning accuracy, the validity calculation method of WIFI data is invented, according to obtained validity is calculated, is being positioned
When filter out a wide range of WIFI for having negative effect for locating effect, the mobile source WIFI and the insensitive WIFI in position, to mention
The precision of high subsequent WIFI positioning.The method of the present invention is independent to the WIFI signal sampled in database progress validity filtering
Method can help these WIFI localization methods to filter invalid WIFI in conjunction with any WIFI localization method such as fingerprint matching, TOA
Source data improves positioning accuracy.
Summary of the invention
Above-mentioned technical problem is solved, the present invention provides a kind of WIFI signal validity filter methods, are specifically judging
The method of construction wireless signal index queue is proposed in WIFI signal positioning validity, with the distance between certain WIFI sampled point,
As the index of wireless signal strength queue, using different location signal equal probability as index value.Then with index queue inertia
Judgment criteria value of the square as the WIFI signal validity.Before executing localization method, it is bigger to remove queue the moment of inertia
WIFI signal can effectively remove a wide range of and mobile WIFI, improve the precision of subsequent WIFI positioning.
In order to achieve the above object, the technical scheme adopted by the invention is that, a kind of WIFI signal validity filter method,
The following steps are included:
S1: by all sample point data reincarnations in a source WIFI at a wireless signal index queue, indexing is two
The distance of sampled point, index value are two sampled point signal strength equal probabilities,
S2: calculating the moment of inertia of wireless signal index queue,
S3: setting the moment of inertia threshold value, and the moment of inertia≤the moment of inertia threshold value wireless signal is retained in during index lines up, it will
The moment of inertia > the moment of inertia threshold value wireless signal lines up middle rejecting from index.
Further, in the S1, collecting in WIFI signal database has N number of source WIFI, the MAC in the corresponding source WIFI
Location list is { MAC1, MAC2... ..., MACN, there is NUM in each source WIFIi(i=1,2,3 ... N) a sampled point { P1,P2,
P3... ..., PNUMi, each sampled point P is strong including the signal for receiving the source WIFI at sampling longitude and latitude lat, lon and sampled point
Spend R, P={ lat, lon, R }.
Further, the S1 specifically includes the following steps:
S11: a MAC is taken out from MAC Address listiAnd the corresponding all sampled point { P of the MAC1,P2,
P3... ..., PNUMi, all sampled point marker bits are set as " not as basic point ",
S12: a Hash table cache is established, as the MACiIndex queue,
S13: the point that any one marker bit is " not as basic point " is taken out from sampled point, is denoted as P1, as comparing base
Point, by P1Flag bit is set as " as basic point ", if not having point " not as basic point " in sampled point, then it represents that the MACi's
All sample point datas are processed, enter step S2,
S14: the point that another marker bit is " not as basic point " is taken out from sampled point, is denoted as P2, according to two o'clock longitude and latitude
Degree calculates P1 and P2 point distance D,
S15: judge P1 and P2 signal strength whether R1=R2, such as it is equal, then need to establish index, judge be in Hash table
The no index for having D establishes index D if not, and its index value is set as 1；If any the index value E for then taking out index D, update
Index value E=E+1, and updated index value is stored back at the index D of Hash table, into S16, if differed, directly into
Enter S16,
S16: judging whether that circulation takes point " not as basic point ", if it is not, return step S14, if taken,
S13 is then returned,
S17: all index D are taken outi(i=1,2,3 ... k) and corresponding index value Ei(i=1,2,3 ... k), by rope
Draw value EiIt is converted into probability value Pi:
It enters step S2 and calculates the moment of inertia.
Further, S2 specifically: the sampled signal that the probability calculation MAC corresponds to the source WIFI is indexed according to wireless signal
The moment of inertia M:
Further, S3 specifically includes the following steps:
S31: one the moment of inertia threshold value of setting, T=500, which is the optimal value by testing acquirement repeatedly, if M≤
T, then the WIFI signal is effective for positioning, will have filtering flag bit to be denoted as 0, if M > T, which be will affect
Positioning accuracy will have filtering flag bit to be denoted as 1, and as encountered to have filtering flag bit be 1 in subsequent location algorithm, then not having to should
WIFI signal participates in positions calculations,
S32: removing index queue, i.e. destruction Hash table cache, returns to S31, handles next MAC data, until MAC is arranged
All MAC datas of table have been processed, i.e., all WIFI signals filter one time.
The present invention is by using above-mentioned technical proposal, compared with prior art, has the advantages that
Detailed description of the invention
Fig. 1 is that sampling point distributions figure of the common WIFI as the source WIFI when is used in the embodiment of the present invention.
Fig. 2 is the sampling point distributions figure that mobile WIFI is used in the embodiment of the present invention as the source WIFI when.
Fig. 3 is that sampling point distributions figure of a wide range of WIFI as the source WIFI when is used in the embodiment of the present invention.
Fig. 4 is that sampling point distributions figure of the insensitive WIFI in position as the source WIFI when is used in the embodiment of the present invention.
Specific embodiment
Now in conjunction with the drawings and specific embodiments, the present invention is further described.
As a specific embodiment, a kind of WIFI signal validity filter method of the invention, comprising the following steps:
S1: by all sample point data reincarnations in a source WIFI at a wireless signal index queue, indexing is two
The distance of sampled point, index value are two sampled point signal strength equal probabilities,
S2: calculating the moment of inertia of wireless signal index queue,
S3: setting the moment of inertia threshold value, and the moment of inertia≤the moment of inertia threshold value wireless signal is retained in during index lines up, it will
The moment of inertia > the moment of inertia threshold value wireless signal lines up middle rejecting from index.
In the S1, collecting in WIFI signal database has N number of source WIFI, and the MAC Address list in the corresponding source WIFI is
{MAC1, MAC2... ..., MACN, there is NUM in each source WIFIi(i=1,2,3 ... N) a sampled point { P1,P2,P3... ...,
PNUMi, each sampled point P includes the signal strength R, P=that the source WIFI is received at sampling longitude and latitude lat, lon and sampled point
{lat,lon,R}。
The S1 specifically includes the following steps:
S11: a MAC is taken out from MAC Address listi, MACiThe physical address for indicating the source WIFI, is the network equipment
Unique identification and the corresponding all sampled point { P of the MAC1,P2,P3... ..., PNUMi, all sampled point marker bits are set as " not
As basic point ",
S12: a Hash table cache is established, as the MACiIndex queue,
S13: the point that any one marker bit is " not as basic point " is taken out from sampled point, is denoted as P1, as comparing base
Point, by P1Flag bit is set as " as basic point ", if not having point " not as basic point " in sampled point, then it represents that the MACiIt is right
All sample point datas answered are processed, enter step S2,
S14: the point that another marker bit is " not as basic point " is taken out from sampled point, is denoted as P2, according to two o'clock longitude and latitude
Degree calculates P1 and P2 point distance D,
S15: judge P1 and P2 signal strength whether R1=R2, such as it is equal, then need to establish index, judge be in Hash table
The no index for having D establishes index D if not, and its index value is set as 1；If any the index value E for then taking out index D, more
New index value E=E+1, and updated index value is stored back at the index D of Hash table, into S16, if differed, directly
Into S16,
S16: judging whether that circulation takes point " not as basic point ", if it is not, return step S14, if taken,
S13 is then returned,
S17: all index D are taken outi(i=1,2,3 ... k) and corresponding index value Ei(i=1,2,3 ... k), by rope
Draw value EiIt is converted into probability value Pi:
It enters step S2 and calculates the moment of inertia.
Further, S2 specifically: the sampled signal that the probability calculation MAC corresponds to the source WIFI is indexed according to wireless signal
The moment of inertia M:
The moment of inertia is smaller, illustrates that the source WIFI occurs that signal equal probabilities are very low, then the WIFI signal is strong in different location
The relatively good difference for embodying position of difference energy is spent, is conducive to position；The moment of inertia is bigger, illustrates that the source WIFI goes out in different location
Existing signal equal probabilities are very high, i.e., receive WIFI signal in different location all and be identical, this source WIFI is just unfavorable for carrying out
Positioning will affect locating effect, belong to mobile WIFI, a wide range of WIFI or the insensitive WIFI in position, it should remove.Into S3,
Carry out validity filtering.
S3 specifically includes the following steps:
S31: one the moment of inertia threshold value of setting, T=500, which is the optimal value by testing acquirement repeatedly, if M≤
T, then the WIFI signal is effective for positioning, will have filtering flag bit to be denoted as 0, if M > T, which be will affect
Positioning accuracy will have filtering flag bit to be denoted as 1, and as encountered to have filtering flag bit be 1 in subsequent location algorithm, then not having to should
WIFI signal participates in positions calculations.
S32: removing index queue, i.e. destruction Hash table cache, returns to S1, handles next MAC data, until MAC is arranged
All MAC datas of table have been processed, i.e., all WIFI signals filter one time.
Advantages of the present invention is illustrated in conjunction with specific embodiments:
There are four WIFI source instances, take 6 sampled point methods of exhibiting processes respectively.Corresponding to common WIFI, mobile WIFI,
The a wide range of WIFI and insensitive WIFI in position, as shown in the table:
It handles by method and step, by taking common WIFI as an example, compares through circulation, sampled point P3=24.483848,
118.187151, -78db } it is equal with P4={ 24.483702,118.187007, -78db } signal strength, therefore rope need to be established
To draw, two o'clock distance is 21 meters, therefore establishes index as<D=21, E=1>, it is subsequent due to the strong identical points of no other signals
Index queue will not be created or update, index queue is {<D=21, E=1>}, and respective index probability is {<D=21, P=1
>}。
For mobile WIFI, sampled point P2={ 24.483731,118.175156, -65db } and P6=24.486299,
118.183064, -65db } signal strength is equal, therefore need to establish index, and 850 meters of two o'clock distance, therefore index is established as < D=
850, E=1 >；Sampled point P3={ 24.483634,118.174394, -62db } and P3=24.483634,
118.174394, -62db } signal strength is equal, therefore need to establish index, and 980 meters of two o'clock distance, therefore index is established as < D=
980, E=1 >.Index queue is {<D=850, E=1>,<D=980, E=1>}, and respective index probability is {<D=850, P
=0.5>,<D=980, P=0.5>}.
Similarly, for a wide range of WIFI, the wireless signal index queue of foundation be<D=650, E=1>,<D=920, E
=1>,<D=600, E=1>} respective index probability be<D=650, P=0.333>,<D=920, P=0.333>,<D=
600, P=0.333 > }
WIFI insensitive for position compares, sampled point P2={ 24.475561,118.141184, -83db } through circulation
Identical as P4={ 24.475629,118.14142, -83db } number intensity, two o'clock distance is 25 meters, therefore establishes index < D=
25, E=1 >；P1={ 24.475524,118.141069, -82db } and P5={ 24.475461,118.141313-82db } number
Intensity is identical, and two o'clock distance is also 25 meters, therefore the index value of D=25 is updated to 2, and index is to become<D=25, and E=2>.
Similarly establish or update the index of other signals identical point pair, finally establish index queue be<D=19, E=1>,<D=37, E
=1>,<D=25, E=2>,<D=23, E=2>} respective index probability be<D=19, P=0.167>,<D=37, P=
0.167>,<D=25, P=0.333>,<D=23, P=0.333>}
The probability of aforementioned four WIFI source sampling point indexes, and calculates its moment of inertia by formula described in S2, and with T=500 threshold
Value filtering, obtain the result is as follows:
It can be seen that mobile WIFI, a wide range of WIFI, the insensitive WIFI in position are turned by establishing wireless signal index queue
The moment of inertia is calculated after being changed to index probability, since inertia values are greater than filtering threshold, is filtered.By these to positioning
The WIFI signal data that effect has deterioration to influence, remove in subsequent comparison, can effectively improve the precision of subsequent WIFI positioning.
Although specifically showing and describing the present invention in conjunction with preferred embodiment, those skilled in the art should be bright
It is white, it is not departing from the spirit and scope of the present invention defined by the appended claims, it in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (5)
1. a kind of WIFI signal validity filter method, it is characterised in that: the following steps are included:
S1: it by all sample point data reincarnations in a source WIFI at a wireless signal index queue, indexes and is sampled for two
The distance of point, index value are two sampled point signal strength equal probabilities,
S2: calculating the moment of inertia of wireless signal index queue,
S3: setting the moment of inertia threshold value, and the moment of inertia≤the moment of inertia threshold value wireless signal is retained in during index lines up, by inertia
Square > the moment of inertia threshold value wireless signal lines up middle rejecting from index.
2. a kind of WIFI signal validity filter method according to claim 1, it is characterised in that: in the S1, WIFI
Collecting in Signals Data Base has N number of source WIFI, and the MAC Address list in the corresponding source WIFI is { MAC1, MAC2... ..., MACN, often
There is NUM in a source WIFIi(i=1,2,3 ... N) a sampled point { P1,P2,P3... ..., PNUMi, each sampled point P includes sampling warp
The signal strength R, P={ lat, lon, R } in the source WIFI are received at latitude lat, lon and sampled point.
3. a kind of WIFI signal validity filter method according to claim 2, it is characterised in that: the S1 is specifically included
Following steps:
S11: a MAC is taken out from MAC Address listi, MACiThe physical address for indicating the source WIFI, is the unique of the network equipment
Mark and the corresponding all sampled point { P of the MAC1,P2,P3... ..., PNUMi, all sampled point marker bits are set as " non-conduct
Basic point ",
S12: a Hash table cache is established, as the MACiIndex queue,
S13: the point that any one marker bit is " not as basic point " is taken out from sampled point, is denoted as P1, will as basic point is compared
P1Flag bit is set as " as basic point ", if not having point " not as basic point " in sampled point, then it represents that the MACiCorresponding institute
There is sample point data processed, enter step S2,
S14: the point that another marker bit is " not as basic point " is taken out from sampled point, is denoted as P2, according to two o'clock calculation of longitude & latitude
P1 and P2 point distance D,
S15: judge P1 and P2 signal strength whether R1=R2, it is such as equal, then it needs to establish index, judges whether there is D in Hash table
Index, index D is established if not, and its index value is set as 1；
If any the index value E for then taking out index D, index value E=E+1 is updated, and updated index value is stored back to Hash table
It indexes at D, into S16, if differed, is directly entered S16,
S16: judge whether that circulation takes point " not as basic point ", if it is not, return step S14 is returned if taken
S13 is returned,
S17: all index D are taken outi(i=1,2,3 ... k) and corresponding index value Ei(i=1,2,3 ... k), by index value
EiIt is converted into probability value Pi:
It enters step S2 and calculates the moment of inertia.
4. a kind of WIFI signal validity filter method according to claim 3, it is characterised in that: S2 specifically: according to
Wireless signal index probability calculation MAC corresponds to the sampled signal the moment of inertia M in the source WIFI:
5. a kind of WIFI signal validity filter method according to claim 2, it is characterised in that: S3 specifically includes following
Step:
S31: one the moment of inertia threshold value of setting, T=500, if M≤T, which is effectively, will have for positioning
Filter flag bit is denoted as 0, if M > T, which will affect positioning accuracy, will have filtering flag bit to be denoted as 1,
S32: removing index queue, i.e. destruction Hash table cache, returns to S31, next MAC data is handled, until MAC list institute
There is MAC data to have been processed, terminates this process.
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| WO2018112825A1 (en) * | 2016-12-22 | 2018-06-28 | 华为技术有限公司 | Positioning method based on wi-fi access point, and device |
| CN108200643B (en) * | 2017-12-29 | 2021-02-19 | 北京奇宝科技有限公司 | Method and device for positioning intelligent terminal |
| CN108419253B (en) * | 2018-01-18 | 2019-11-22 | 北京三快在线科技有限公司 | A kind of location determining method, device, electronic equipment and readable storage medium storing program for executing |
| CN110650484B (en) * | 2019-09-02 | 2022-10-28 | 深圳数位大数据科技有限公司 | Method and device for cleaning interference signal, storage medium and computer equipment |
| CN113852913B (en) * | 2021-08-06 | 2024-05-14 | 恒鸿达科技有限公司 | Low-power-consumption indoor and outdoor positioning method and device based on mobile wifi identification |
| CN113630719A (en) * | 2021-08-06 | 2021-11-09 | 恒鸿达科技有限公司 | Method, device, equipment and medium for identifying mobile wifi signal |
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