CN107425926A - The method and system that Site Survey starts - Google Patents
The method and system that Site Survey starts Download PDFInfo
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- CN107425926A CN107425926A CN201710673778.2A CN201710673778A CN107425926A CN 107425926 A CN107425926 A CN 107425926A CN 201710673778 A CN201710673778 A CN 201710673778A CN 107425926 A CN107425926 A CN 107425926A
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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
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/025—Services making use of location information using location based information parameters
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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
- H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
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Abstract
The method and system that a kind of Site Survey starts, whether prejudged when access point starts needs to carry out location updating to it, access point is first arranged to terminal work mode, and the positional information of the access point is obtained using terminal positioning mode, the positional information that this is used for computing terminal by the access point uploads onto the server, so as to improve the precision of terminal measurement.The present invention can realize accurate WLAN user positioning measurement, and support customer location timely tracking, support large-scale wireless LAN user's positioning measurement, in addition the present invention possess further realize user's sub-clustering positioning ability and lower deployment cost it is low, without hardware update.
Description
Technical field
The present invention relates to a kind of technology in wireless information transfer field, specifically a kind of side of Site Survey startup
Method and system, can be used for Cellular Networks, Internet of Things, car networking, intelligent grid and intelligent home network etc. has numerous indoor and outdoors
Broadband multi-frequency, the occasion of multiple antennas network of user's location requirement.
Background technology
With flourishing for mobile Internet, the application of WLAN (Wireless Fidelity, Wi-Fi) is got over
Come more extensive, connecting internet development from original computer includes a series of meters such as mobile phone, tablet personal computer, intelligent appliance to providing
Interconnection and internet data access function, the quantity of access point (Access Point, AP) including calculation equipment are also presented
Explosive growth.With the large scale deployment of Wi-Fi access points, the user based on Wi-Fi access points positions fluffy using occurring
The exhibition of breaking out, including the push of the customer-action analysis based on customer location, sales promotion information fixed point, market layout optimization etc..Wi-Fi connects
The operator of access point, the optimization function for the various scenes such as market, hospital, government organs is proposed, wherein all containing
Tight demand to the subscriber location function of Wi-Fi access points.But in the positioning for being currently based on Wi-Fi access points is applied, still
The problem of a large amount of so be present, the actual conditions of regular movement are needed especially for part Wi-Fi AP positions, temporarily without suitable
Solution.If displacement is more notable, tremendous influence can be brought to the location estimation of terminal user.
The content of the invention
The present invention needs to carry out regular movement according to actual conditions for the position of general commercial/family expenses access point,
The considerable influence brought so as to the position measurement to terminal.Simultaneously as in view of access point position remeasure along with
The temporary transient interruption of user service and extra resource consumption, the problem of how carrying out in time carrying out location updating to access point,
The method and system that a kind of Site Survey starts are proposed, accurate WLAN user positioning measurement can be realized, and
Support customer location timely tracking, support large-scale wireless LAN user's positioning measurement, in addition the present invention possess into
One step realize user's sub-clustering positioning ability and lower deployment cost it is low, without hardware update.
The present invention is achieved by the following technical solutions：
Whether the present invention relates to a kind of method that Site Survey starts, being prejudged when access point starts needs to it
Location updating is carried out, i.e., access point is first arranged to terminal work mode, and the access point is obtained using terminal positioning mode
Positional information, the positional information that this is used for computing terminal by the access point upload onto the server, so as to improve terminal measurement
Precision.
When described access point is fixed access point or possesses the access point of periodicity restarting facility, do not enter
Corresponding location updating go to reduce the influence time of user service and resource consumption.
Methods described specifically includes following steps：
Step 1, user equipment are used to measure to transmit between user equipment and access point to access point transmitted reference signal s to be believed
The real time status information in road.
Described reference signal includes but is not limited to pilot tone.
The reference signal s launched respectively according to user is estimated this user equipment and access point by step 2, each access point
Between transmission channel real time status information H.
For example, for common reception signal y=Hs+w (w is noise), can be estimated according to known reference signal s
Go out corresponding channel real time status information H (such as：The methods of H=y/s).
Step 3, the signal for being received on different access points and different frequencies, pass through signal estimation method meter
Calculate inclined at that time and eliminated.
Described signal estimation method, including but not limited to least absolute error method, least square method etc..For example, for
Original channel real time status information H, obtained channel condition information H ' to the rear can be by based on minimum absolute when it is eliminated
The channel condition information of error is inclined when eliminating, and is specially：
1. inclined T when obtaining minimum according to phasing matrix P corresponding to channel condition information H：
Wherein：P (i, j) represents phase information of the channel condition information on i-th antenna, j-th of subcarrier, and fc is in carrier wave
Bandwidth, I and J represent the antenna number of maximum and in carrier numbers respectively；
2. inclined T during according to minimum, original channel status information H is compensated, channel shape to the rear letter when being eliminated
Cease H'：
Obtained channel condition information H ' to the rear when step 4, access point are for eliminating, according to subchannel and antenna serial number
Dimension, it is extended respectively so that the channel condition information obtained after extensionAnd find out respective channels status informationColumn vector
Characteristic vector a (θ, τ), this feature vector is the function on angle of arrival θ and propagation time τ.
Described extension, meet quantity of its dimension at least above independent channel between access point and user, be specially：It is right
Obtained channel condition information H' to the rear is extended respectively according to the dimension of subchannel and antenna serial number during elimination, after making extension
Channel condition informationMeet quantity of the dimension at least above independent channel between this WAP and user, and find out pair
Channel condition information after should extendingThe characteristic vector a (θ, τ) of column vector.
Described characteristic vector is angle of arrival θ and propagation time τ function, for 4 antennas, the channel shape of 10 subcarriers
State information H'
Signal reconstruction is carried out in the case where independent channel quantity is more than 5：
The characteristic vector of generationWherein：Ω=e-j2πfcτIt is phase offset caused by propagation delay；
Φ=e-j2πDsin(θ)f/cIt is to reach phase offset caused by angle, D is the distance between neighbouring reception antenna, and f believes for transmitting
Number frequency.
Step 5, access point are according to the channel condition information after reconstructWith characteristic vector a (θ, τ), estimated by multidimensional signal
Meter method, the angle of arrival θ and propagation time τ sample of each sampled point are estimated, and sub-clustering is carried out according to the tightness degree of sample
Operation, decomposites each most probable angle of arrival θ and propagation time τ of bar independent channel between access point and user.
Described multidimensional signal method of estimation includes but is not limited to orthogonal subspaces method, maximum likelihood method etc., wherein：It is based on
The angle of arrival of orthogonal subspaces method and propagation time estimation specifically refer to：
I) positive definite matrix is obtainedValue；
Ii Eigenvalues Decomposition) is carried out to positive definite matrix X, found out when meeting that characteristic value is less than threshold value, corresponding to this feature value
Characteristic vector y；
Iii) all obtained combination of eigenvectors are orthogonal subspace matrices Y；
Iv) according to characteristic vector a (θ, τ) and orthogonal subspaces matrix Y, when finding out M (θ, τ) and obtaining extreme value, corresponding θ and
τ value：I.e. most probable angle of arrival θ and propagation time τ.
Step 6, access point calculate weighted value to each bar independent channel according to weighting function, and select weighted value most respectively
Big path obtains the angle of arrival θ ' and propagation time τ ' of the direct path as direct path；Then to each access point pin
Carry out operation of the above-mentioned steps 1 to step 6 respectively to different frequencies, the angle of arrival θ ' of obtained each frequency direct path and
Propagation time τ '.
Described weighting function uses but unlimited on sample size, sample propagation time, sample angle of arrival and when propagating
Between random degree (such as variance, standard deviation), the weighted sum function of the variable such as sample duration.
Step 7, angle of arrival θ ' and propagation time τ ' for each access point by Combined estimator algorithms selection benchmark, and
As benchmark, the weight of other frequency direct paths is calculated；Finally according to the power in each frequency path on each access point
The geographical location information of weight and each access point, calculate the positional information of user equipment.
The standard of described Combined estimator algorithms selection can be propagation time most short direct path in each frequency.
Described weight and position information of user equipment obtains especially by the following manner：
A) on the basis of the direct path of frequency 1, i.e.,So for frequency n direct path, what it was referred to
Angle of arrival should beThen the weight corresponding to frequency n direct path is：
Wherein：β is used for unified angle and the dimension in propagation time and balance angular error and propagation delay error and position is estimated
The influence brought is counted, can be tested calibrated by equipment in systems in practice.
B) estimate that position information of user equipment (x, y) seeks the process of following optimization problem：
Wherein：M be WAP sequence number, n be frequency sequence number, xmAnd ymThe coordinate bit of as m-th WAP
Put.SimilarWithRespectively user equipment reaches m-th of WAP on n-th of frequency, by radio transmission
Propagation delay and angle of arrival,For to should propagation path weight.
Step 8, the customer position information calculated is stored in the mapping table on user's geographical location information, and on
Reach the access point and user equipment of correlation.
The present invention relates to a kind of system for realizing the above method, including：Either distal end is deployed on some access point to take
Combined estimator unit, access point and the user equipment being engaged on device, wherein：Access point is sent on multiple frequencies to user equipment
Signal measure, estimate angle of arrival and the propagation time of subscriber signal, so as to estimate user with respect to access point position
Confidence ceases and exported to Combined estimator unit, Combined estimator unit estimates use according to the positional information from diverse access point
The accurate geographical position in family, and carry out timely user geographical position and update.
It is preferably further provided with whether needing the entry condition of location updating to sentence for prejudging in described access point
Disconnected module and for access point self poisoning and restart functional module.
Multifrequency point angle of arrival and propagation time receiving module and multifrequency point are preferably further provided with described access point
Direction of arrival and propagation time Combined estimator and decision-making module.
Technique effect
The more situation for wireless receiving end collection wireless signal of prior art.For in general WAP, its
Parameter setting is configured in a manner of wireless transmitting terminals, does not possess stationkeeping ability generally；And need linear using receiving
The modes such as translation, gather the position that multiple signal synthesis judge interference source, by comparison, the present invention is targetedly changed
Enter, and technique effect includes：
1) present invention carries out angle of arrival and the progress in propagation time in multiple frequencies by multiple access points to user equipment
Multi-faceted estimation, user can be more accurately determined to the direct path between access point, so as to solve original scheme
May due to reflect, scatter or signal interference and bring direct path estimation it is inaccurate the problem of.Further, since for every
Individual access point, present invention employs the measurement of multifrequency point, not only increases the additional observations point for direct path, is also joint
Computing unit provides weight reference to the Combined estimator of customer location, so as to be provided for the accurate combined measurement of multiple access points
Important information.
2) reference signal that the present invention is mainly launched by user is come metrical information, therefore, during actual deployment,
The alignment system can analyze the position of user while user carries out data transmission, without extra reference signal
Or communication process.This, which allows for alignment system, can estimate the situation of change of location of user equipment in time, realize customer location
Timely tracking.
3) for large-scale WLAN, the subscriber signal that the present invention can detect according to diverse access point enters
The estimation of row customer location, not receiving the access point of subscriber signal only needs in computed user locations without a moment's thought,
Without the algorithm of extra change of location estimation.Therefore, the localization method has good adaptability, can be adapted to different rule
User's positioning measurement of the network architecture of mould, particularly large-scale wireless LAN.
4) when the present invention can enter row data communication by user and access point, the reference signal of transmitting come measure user with
Channel and position between access point, it is not necessary to extra wireless communication burden.And access point and Combined estimator unit it
Between communication be also only the angle of arrival of direct path and propagation time on user's different frequent points, thus the actual burden of network can
Control.Simultaneously as Combined estimator unit can collect the angle of arrival and propagation time information that different user reaches diverse access point,
User's sub-clustering can be carried out according to relevant information so as to further provide for the ability of user's sub-clustering positioning.
5) method used in the present invention only needs to increase the use of software realization respectively in access point and Combined estimator unit
Family angle of arrival and propagation time estimation module and the united information in multi-access point user angle of arrival and propagation time processing module, and
Any hardware or software upgrading need not be increased at user equipment end, thus with very low lower deployment cost and good use
Family equipment compatibility.
Brief description of the drawings
Fig. 1 is the system construction drawing of WAP positioning starting；
Fig. 2 is that the module of Site Survey starter realizes figure；
Fig. 3 is that WLAN proposed by the present invention is based on multi-access point, multifrequency point combined measurement localization method flow chart；
General flow chart of the WLAN based on multi-access point, multifrequency point combined measurement localization method；
Fig. 4 is two access points, the customer location method schematic diagram of three frequency WLANs；
Fig. 5 is the calculation schematic diagram of weight and position information of user equipment；
A is that weight estimates schematic diagram in figure；B is that positional information estimates schematic diagram.
Embodiment
Embodiment 1
The customer location estimation of three access points, two frequency WLANs
As shown in figure 1, the scene that customer location is estimated is directed to for three access points in the present embodiment, wherein three connect
Access point is connected by return network with Combined estimator unit.For each access point, user has conventional 2.4GHz and 5GHz
Two frequency bins are available for accessing.For convenience of description, it is assumed that two frequency bins have a direct path and a reflection path respectively.
As shown in Fig. 2 the system of the above method is realized for the present embodiment, including：It is deployed on some access point either
Combined estimator unit, access point and user equipment on far-end server, wherein：Access point is set on multiple frequencies to user
The signal that preparation goes out is measured, and estimates angle of arrival and the propagation time of subscriber signal, and so as to estimate, user is relative to be accessed
The positional information of point is simultaneously exported to Combined estimator unit, and Combined estimator unit is estimated according to the positional information from diverse access point
The accurate geographical position of user is calculated, and carries out timely user geographical position and updates.
Positioning starting device is preferably further provided with access point in the present embodiment, including：The startup being sequentially connected is drawn
Guide module, entry condition judge module, terminal pattern starting module, position and restart functional module and with entry condition judge
The connected starting module in the form of access point of module, wherein：Start guiding module and send startup side to entry condition judge module
Formula decision instruction, selectivity connects the starting module in the form of access point to Starting mode to entry condition judge module respectively needed for
Or terminal pattern starting module, terminal pattern starting module send self poisoning instruction to start to positioning and restart functional module
Geographical position updates.
As shown in figure 3, for each access point and each frequency (such as access point 1, frequency 1), it will connect first
The reference signal s of user's transmitting is received, estimates the real time status information H of transmission channel between user equipment and access point.In reality
In the system of border, the reference signal of user is generally launched simultaneously with data transfer signal, therefore will not introduce extra communication substantially
Expense.
Access point 1 is after the reception of user's transmission signal, by the real-time status by least absolute error method to frequency 1
Information H analysis estimates the when deviator of reception signal, and deviator when this is eliminated by phase compensation, after being eliminated
Channel condition information H '.With 4 antennas, the channel condition information H ' of 10 subcarriers, it is more than 5 situation in independent channel quantity
Exemplified by, channel condition information
Then, access point 1 is by according to the dimension of subchannel and antenna serial number, to the channel condition information of frequency 1Carry out weight
Structure,Meet its dimension at least above access point with using
The quantity of independent channel between family, and find out channel condition information after reconstructThe characteristic vector a (θ, τ) of column vector：
Wherein：Wherein：Ω=e-j2πfcτIt is phase offset caused by propagation delay；
Φ=e-j2πDsin(θ)f/cIt is to reach phase offset caused by angle, D is the distance between neighbouring reception antenna, and f believes for transmitting
Number frequency.
Access point 1 is according to the channel condition information of frequency after reconstruct 1With characteristic vector a (θ, τ), estimate angle of arrival θ and
Propagation time τ.Because propagation path may have a plurality of, corresponding same channel condition informationMultiple estimate may be obtained
Angle of arrival θ and propagation time τ value.In real system, the channel condition information of frequency 1It will be with data transmission period
Continue, obtain multiple sampled results, therefore, multiple angle of arrival θ and propagation time τ sample can be produced accordingly.The basis of access point 1
The tightness degree of the sample of frequency 1 carries out clustering operation, and in units of sample cluster, it is only to decomposite each bar between access point and user
Vertical channel most probable angle of arrival θ and propagation time τ.Before Combined estimator unit is passed to, access point 1 is to 1 each bar of frequency
Independent channel calculates weighted value respectively, and selects the maximum path of weighted value as direct path, and obtains the direct projection road of frequency 1
The angle of arrival θ ' and propagation time τ ' in footpath., will for the frequency 2 of the different frequent points and access point 1 of access point 2 and access point 3
The angle of arrival θ ' and propagation time τ ' of corresponding direct path are obtained using above-mentioned same flow, and passes to Combined estimator list
Member.
Combined estimator unit selects the angle of arrival θ ' and propagation time τ ' of benchmark for access point 1,2,3 respectively, and it is selected
Standard can be propagation time most short direct path in each frequency.For example, the benchmark frequency of access point 1 is frequency 1, connect
The benchmark frequency of access point 2 is frequency 2, and the benchmark frequency of access point 3 is frequency 1.Combined estimator unit by the frequency 1 of access point 1, connect
On the basis of the direct path of the frequency 2 of access point 2 and the frequency 1 of access point 3 determines, and calculate the frequency 2 of access point 1, the frequency of access point 2
1 and the frequency 2 of access point 3 direct path weight.After completing weight calculation, Combined estimator unit will be according on each access point
The weight in each frequency path, the geographical location information of each access point, calculate the positional information of user equipment.
After Combined estimator unit completes the positional information calculation of user equipment, the customer position information calculated is stored
In the mapping table on user's geographical location information, and pass to the access point and user equipment of correlation.
Embodiment 2
Two access points, three frequency WLANs
As shown in figure 4, access point 1,2 is directed to the scene that customer location is estimated, two of which access in the present embodiment
Point is connected by return network with Combined estimator unit.For each access point, user have conventional 2.4GHz, 5GHz and
Tri- frequencies of 60GHz are available for accessing.For convenience of description, it is assumed that three frequencies have a direct path and a reflection respectively
Path.
For each access point and each frequency (such as access point 1, frequency 1), it will receive user's transmitting first
Reference signal s, estimate the real time status information H of transmission channel between user equipment and access point.In systems in practice, use
The reference signal at family is generally launched simultaneously with data transfer signal, therefore will not introduce extra communication overhead substantially.
Access point 1 after the reception of user's transmission signal, is missed according to the method in embodiment 1 by lowest mean square
Poor method is analyzed the real time status information H of frequency 1, estimate reception signal when deviator and disappeared by phase compensation
Remove, the channel condition information H ' after being eliminated.Then, access point 1 is by according to the dimension of subchannel and antenna serial number, to frequency
1 channel condition informationReconstruct as shown in Figure 5 is carried out, finds out channel condition information after reconstructThe characteristic vector a of column vector
(θ, τ), and estimate angle of arrival θ and propagation time τ.Because propagation path may have a plurality of, corresponding same channel status letter
BreathMultiple values for estimating angle of arrival θ and propagation time τ may be obtained.In real system, the channel condition information of frequency 1Continuing for data transmission period is will be with, obtains multiple sampled results, therefore, multiple angle of arrival θ and propagation can be produced accordingly
Time τ sample.Access point 1 carries out clustering operation according to the tightness degree of the sample of frequency 1, and in units of sample cluster, decomposes
Go out each most probable angle of arrival θ and propagation time τ of bar independent channel between access point and user.Passing to Combined estimator unit
Before, access point 1 calculates weighted value respectively to each bar independent channel of frequency 1, and selects the maximum path of weighted value as straight
Rays footpath, and obtain the angle of arrival θ ' and propagation time τ ' of the direct path of frequency 1.
For the frequency 2 and the different frequent points of frequency 3 and access point 2 of access point 1, will be obtained using above-mentioned same flow
The angle of arrival θ ' and propagation time τ ' of corresponding direct path are taken, and passes to Combined estimator unit.
As shown in Figure 5 a, Combined estimator unit selects angle of arrival θ ' and the propagation time of benchmark for access point 1,2 respectively
τ ', its standard selected can be propagation time most short direct paths in each frequency.For example, the benchmark frequency of access point 1
For frequency 1, the benchmark frequency of access point 2 is frequency 2.Combined estimator unit is straight by the frequency 1 of access point 1 and the frequency 2 of access point 2
On the basis of rays footpath determines, and the frequency 2,3 of access point 1 is calculated, the weight of the direct path of the frequency 1,3 of access point 2.
As shown in Figure 5 b, after completing weight calculation, Combined estimator unit will be according to each frequency path on each access point
Weight, the geographical location information of each access point, calculate the positional information of user equipment.
After Combined estimator unit completes the positional information calculation of user equipment, the customer position information calculated is stored
In the mapping table on user's geographical location information, and pass to the access point and user equipment of correlation.
Above-mentioned specific implementation can by those skilled in the art on the premise of without departing substantially from the principle of the invention and objective with difference
Mode local directed complete set is carried out to it, protection scope of the present invention is defined by claims and not by above-mentioned specific implementation institute
Limit, each implementation in the range of it is by the constraint of the present invention.
Claims (10)
1. a kind of method that Site Survey starts, it is characterised in that whether prejudged when access point starts needs to it
Location updating is carried out, i.e., access point is first arranged to terminal work mode, and the access point is obtained using terminal positioning mode
Positional information, the positional information that this is used for computing terminal by the access point upload onto the server, so as to improve terminal measurement
Precision.
2. according to the method for claim 1, it is characterized in that, specifically include following steps：
Step 1, user equipment are used to measure transmission channel between user equipment and access point to access point transmitted reference signal
Real time status information；
Step 2, each access point estimate the reference signal launched respectively according to user between this user equipment and access point
The real time status information of transmission channel；
Step 3, the signal for being received on different access points and different frequencies, it is calculated by signal estimation method
When partially and eliminated；
Obtained channel condition information H ' to the rear when step 4, access point are for eliminating, according to subchannel and the dimension of antenna serial number
Degree, is extended so that the channel condition information obtained after extension respectivelyAnd find out respective channels status informationColumn vector
Characteristic vector a (θ, τ), this feature vector is the function on angle of arrival θ and propagation time τ；
Step 5, access point are according to the channel condition information after reconstructWith characteristic vector a (θ, τ), pass through multidimensional signal estimation side
Method, the angle of arrival θ and propagation time τ sample of each sampled point are estimated, and clustering operation are carried out according to the tightness degree of sample,
Decomposite each most probable angle of arrival θ and propagation time τ of bar independent channel between access point and user；
Step 6, access point calculate weighted value respectively according to weighting function to each bar independent channel, and select weighted value maximum
Path obtains the angle of arrival θ ' and propagation time τ ' of the direct path as direct path；Then to each access point for not
Same frequency carries out operation of the above-mentioned steps 1 to step 6 respectively, the angle of arrival θ ' of obtained each frequency direct path and propagation
Time τ '；
Step 7, angle of arrival θ ' and propagation time τ ' for each access point by Combined estimator algorithms selection benchmark, and with this
On the basis of, calculate the weights of other frequency direct paths；Finally according to the weight in each frequency path on each access point and
The geographical location information of each access point, calculate the positional information of user equipment；
Step 8, the customer position information calculated is stored in the mapping table on user's geographical location information, and be uploaded to
Related access point and user equipment.
3. according to the method for claim 2, it is characterized in that, described signal estimation method is real-time for original channel
Status information H, obtained channel condition information H ' to the rear can be by the channel status based on least absolute error when it is eliminated
Information is inclined when eliminating, and is specially：
1. inclined T when obtaining minimum according to phasing matrix P corresponding to channel condition information H：
Wherein：P (i, j) represents phase information of the channel condition information on i-th antenna, j-th of subcarrier, and fc is in carrier wave
Bandwidth, I and J represent the antenna number of maximum and in carrier numbers respectively；
2. inclined T during according to minimum, original channel status information H is compensated, channel shape information H' to the rear when being eliminated：
4. according to the method for claim 1, it is characterized in that, described extension, meet its dimension at least above access point with
The quantity of independent channel between user, i.e., to eliminate when obtained channel condition information H' to the rear according to subchannel and antenna serial number
Dimension be extended respectively, make the channel condition information after extensionMeet dimension at least above this WAP and user
Between independent channel quantity, and find out the channel condition information after corresponding extensionThe characteristic vector a (θ, τ) of column vector.
5. according to the method for claim 2, it is characterized in that, described multidimensional signal method of estimation, in particular to：
I) positive definite matrix is obtainedValue；
Ii Eigenvalues Decomposition) is carried out to positive definite matrix X, found out when meeting that characteristic value is less than threshold value, the spy corresponding to this feature value
Levy vectorial y；
Iii) all obtained combination of eigenvectors are orthogonal subspace matrices Y；
Iv) according to characteristic vector a (θ, τ) and orthogonal subspaces matrix Y, when finding out M (θ, τ) acquirement extreme values, corresponding θ's and τ
Value：I.e. most probable angle of arrival θ and propagation time τ.
6. according to the method for claim 1, it is characterized in that, described weighting function uses to be passed on sample size, sample
Between sowing time, sample angle of arrival and the random degree in propagation time, the weighted sum function of sample duration.
7. according to the method for claim 2, it is characterized in that, described weight and position information of user equipment especially by with
Under type obtains：
A) on the basis of the direct path of frequency 1, i.e.,So for frequency n direct path, its arrival referred to
Angle should beThen the weight corresponding to frequency n direct path is：
Wherein：β is used for unified angle and the dimension in propagation time and balance angular error and propagation delay error to location estimation band
The influence come, it can be tested calibrated by equipment in systems in practice；
B) estimate that position information of user equipment (x, y) seeks the process of following optimization problem：
Wherein：M be WAP sequence number, n be frequency sequence number, xmAnd ymThe coordinate bit of as m-th WAP
Put.SimilarWithRespectively user equipment reaches m-th of WAP on n-th of frequency, by radio transmission
Propagation delay and angle of arrival,For to should propagation path weight.
A kind of 8. system for realizing any of the above-described claim methods described, it is characterised in that including：It is deployed in some access point
Upper Combined estimator unit, access point and user equipment either on far-end server, wherein：Access point is on multiple frequencies
The signal that user equipment is sent is measured, angle of arrival and the propagation time of subscriber signal are estimated, so as to estimate user
With respect to the positional information of access point and output is to Combined estimator unit, and Combined estimator unit is according to the position from diverse access point
Information, the accurate geographical position of user is estimated, and carry out timely user geographical position and update.
9. system according to claim 8, it is characterized in that, positioning starting device is further provided with described access point,
Including：The startup guiding module that is sequentially connected, entry condition judge module, terminal pattern starting module, position and restart function
Module and the starting module in the form of access point being connected with entry condition judge module, wherein：Start guiding module to startup
Condition judgment module sends Starting mode decision instruction, and entry condition judge module Starting mode needed for selectively connects respectively
Connect starting module or terminal pattern starting module in the form of access point, terminal pattern starting module is to positioning and restart functional module
Self poisoning instruction is sent to start geographical position renewal.
10. system according to claim 8, it is characterized in that, multi-access point user is further provided with described access point
The united information in angle of arrival and propagation time handles module, including multifrequency point angle of arrival and propagation time receiving module and multifrequency point
Direction of arrival and propagation time Combined estimator and decision-making module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710673778.2A CN107425926A (en) | 2017-08-09 | 2017-08-09 | The method and system that Site Survey starts |
Applications Claiming Priority (1)
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| CN113423097A (en) * | 2020-08-20 | 2021-09-21 | 阿里巴巴集团控股有限公司 | Positioning method and device based on RFID and electronic equipment |
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