CN102387526B - A kind of method and device improving wireless cellular system positioning precision - Google Patents

Abstract

The invention discloses a kind of method and the device that improve wireless cellular system positioning precision, in described device, drive test data collection analysis module is for gathering drive test data, and road test data carries out the los path time delay that statistical analysis obtains each test point; The test data that back-end data collection analysis module is followed the tracks of for gathering backstage, carries out to the test data that backstage is followed the tracks of the reverse link time delay that statistical analysis obtains each test point; Error calculating module, is averaged after suing for peace, obtains the average delay error of this Serving cell for the difference of the reverse hardware time delay gained reverse link time delay of each corresponding for single Serving cell test point being deducted los path time delay and equipment; Time delay correcting module, revises for utilizing the reverse hardware time delay of described average delay error to the equipment of Serving cell.Application the present invention accurately can obtain reverse hardware time delay, improves the positioning precision of wireless cellular system.

Description

A kind of method and device improving wireless cellular system positioning precision

Technical field

The present invention relates to wireless communication technology field, particularly relate to a kind of method and the device that improve wireless cellular system positioning precision.

Background technology

In a wireless communication system, wireless cellular system adopts several base stations to form wireless cellular network, utilize this wireless cellular system to position, this kind of positioning function can be applicable to the many-sides such as public safety service (as: emergency medical, urgent location, emergency alarm service), Criminal Investigation, cellular system Plantation and privilege, information service, the special paying in position, boats and ships and fisheries management, navigation and intelligent transportation system (ITS).

For the positioning function of wireless cellular system, there is multiple localization method and location algorithm, wherein basic localization method comprises: cell unit location (positioning according to reference cell signal), signal arrival field intensity (according to reference cell received power location), direction of arrival degree (according to reference cell deflection location), time of arrival (toa) (position according to reference cell signal lag, namely TOA location), digital (positioning according to the delay inequality reaching different reference cell, i.e. TDOA).

The algorithm that current cellular localization is commonly used is TOA (TimeOFArrival, the time of advent) algorithm and TDOA (TimeDifferenceofArrival, the time of advent is poor) algorithm.Non line of sight NLOS (Non-LineofSight, non line of sight) to propagate be the main source of error of TOA, TDOA algorithm navigation system, because when the characteristic the unknown of non line of sight NLOS error statistics, traditional method for parameter estimation, cannot provide positional information to be measured and estimate accurately.

Conventional non line of sight NLOS propagated error suppresses to comprise with removing method:

Wylie discrimination method, utilizes NLOS distance measure to reconstruct sighting distance LOS (LineofSight) measured value;

Least square method, namely according to the precision (reliability) of each measured value, adopts different weights, to improve positioning precision in least square method.

In wireless cellular network actual in addition, the factor such as reverse hardware time delay, device channel plate demodulation time of the feed line length of base station, equipment is also not exclusively the same, and therefore the factor such as feed line length, the reverse hardware time delay of equipment, device channel plate demodulation time of base station also affects the positioning precision of actual wireless cellular system.

Therefore, the factors such as the feed line length of base station, the reverse hardware time delay of equipment, device channel plate demodulation time of how eliminating are on the impact of positioning precision, and the positioning precision improving wireless cellular system becomes the technical issues that need to address.

Summary of the invention

Technical problem to be solved by this invention is, a kind of method and device improving wireless cellular system positioning precision, lower for the positioning precision solving present wireless cellular system, overcomes the factors such as hardware time delay to the impact of positioning precision.

In order to solve the problem, the present invention proposes a kind of method improving wireless cellular system positioning precision, comprising:

Gather the test data of drive test data and backstage tracking, carry out by road test data the los path time delay that statistical analysis obtains each test point, carry out by the test data of following the tracks of backstage the reverse link time delay that statistical analysis obtains each test point;

The difference reverse link time delay of each corresponding for single Serving cell test point deducted after the reverse hardware time delay of los path time delay and equipment is averaged after suing for peace, and obtains the average delay error of this Serving cell;

The reverse hardware time delay of described average delay error to the equipment of Serving cell is utilized to revise, using the reverse hardware time delay of the reverse hardware delayed addition sum of average delay error and equipment as the correction of this Serving cell.

Described test point is and works the test point of exhaling, switching the moment of message corresponding.

The los path time delay of described each test point is obtained divided by the approximate light velocity by the actual range of travelling carriage and Serving cell; The reverse link time delay of described each test point is that system realizes automatically according to corresponding algorithm.

Described reverse link time delay, comprising: the reverse hardware time delay of non line of sight delay time error, the demodulation of device channel plate, feeder line time delay, equipment.

The present invention also provides a kind of device improving wireless cellular system positioning precision, comprising:

Drive test data collection analysis module, for gathering drive test data, carries out by road test data the los path time delay that statistical analysis obtains each test point;

Back-end data collection analysis module, for gathering the test data that backstage is followed the tracks of, carries out by the test data of following the tracks of backstage the reverse link time delay that statistical analysis obtains each test point;

Error calculating module, is averaged after suing for peace, obtains the average delay error of this Serving cell for the difference of the reverse hardware time delay gained reverse link time delay of each corresponding for single Serving cell test point being deducted los path time delay and equipment;

Time delay correcting module, for utilizing the reverse hardware time delay of described average delay error to the equipment of Serving cell to revise, using the reverse hardware time delay of the reverse hardware delayed addition sum of described average delay error and equipment as the correction of this Serving cell.

Described test point is and works the test point of exhaling, switching the moment of message corresponding.

Described drive test data collection analysis module is the los path time delay obtaining each test point according to the actual range of travelling carriage and Serving cell divided by the approximate light velocity.

The reverse link time delay of each test point that described back-end data collection analysis module gathers is that system realizes automatically according to corresponding algorithm.

The method of raising wireless cellular system positioning precision of the present invention and device, statistical analysis is carried out by road test data and backstage statistics, can accurately obtain average delay error, recycle the reaction hardware time delay of this average delay error to equipment to revise, thus accurate oppositely hardware time delay can be obtained, this just effectively can reduce the reverse hardware time delay of equipment, feeder line time delay, the impact on positioning precision such as channel board demodulation time, effectively can improve the positioning precision of cellular system, strengthen positioning precision to plan in cellular system networks, Optimization analyses, public safety is served, the application of the aspects such as information service.

Accompanying drawing explanation

Fig. 1 is the method flow diagram improving wireless cellular system positioning precision;

Fig. 2 is the structure chart of the device improving wireless cellular system positioning precision.

Embodiment

For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.

Owing to there is the feed line length of base station in wireless cellular system, the reverse hardware time delay of equipment, the device channel plate demodulation time etc. affects the factor of positioning precision, the present invention proposes the method and device that improve wireless cellular system positioning precision, statistical analysis is carried out by road test data and backstage statistics, obtain the mean error between the reverse link time delay of all test points in Serving cell and los path time delay, recycle the reverse hardware time delay that this mean error removes corrective, thus can the reverse delay data of accurate equipment, solve the problem affecting positioning precision in prior art, improve wireless cellular system positioning precision.

The method of described raising wireless cellular system positioning precision, as shown in Figure 1, comprising:

Step 1: the test data gathering drive test data and backstage tracking, carry out by road test data the los path time delay that statistical analysis obtains each test point, carry out by the test data of following the tracks of backstage the reverse link time delay that statistical analysis obtains each test point;

Step 2: the difference reverse link time delay of each corresponding for single Serving cell test point being deducted los path time delay and counter-directional device time delay gained is averaged after suing for peace, and obtains the average delay error of this Serving cell;

Step 3: utilize the reverse hardware time delay of described average delay error to equipment to revise, using the reverse hardware time delay as the equipment of the correction of this Serving cell of the average delay error of los path Serving cell and counter-directional device delayed addition sum.

In described step 1, the test data needing road test data and backstage to follow the tracks of gathers.

The collection of drive test data, can adopt periodic calls, and call holding time controls at about 10 seconds, and test data comprises all Serving cells of wireless cellular system, has mainly comprised to exhale, switch information test point, the corresponding some test points in each Serving cell.

The test data collection that backstage is followed the tracks of is exhaled for described, switch the reverse link delayed data that information test point gathers each test point.

As shown in table 1, show the tables of data of application when drive test data gathers, wherein, some test points can be configured for each Serving cell, record the testing time of each test point and the distance d of los path _i.

Table 1: the drive test data record sheet of test point

Time	Rise and exhale test point	Serving cell	Distance d i
					Orig1	CELL1
	Orig2
					Orig3
	Orig4	CELL2
	Orign	CELLm

Wherein m is the number of total Serving cell, and n is that test point number is exhaled in corresponding the rising in each Serving cell.

For cdma system, only had exhaling, switch message comprise Serving cell reverse link time delay and with other cellular link delayed data, therefore the range information of message point and reference cell is exhaled and switched to rising of Main Analysis drive test data, and this distance can be understood as the space link delayed data of actual sighting distance LOS propagation; Therefore the spacial sight-distance path delay τ according to the above-mentioned all test points of Serving cell statistics is needed _iinformation.

As shown in table 2, show the record sheet of test data that backstage that each test point gathers is followed the tracks of, in table 2, have recorded the test point that Serving cell is corresponding, and the distance D that backstage reverse link time delay corresponding to each test point is corresponding _i.

Table 2: the test data record sheet of the backstage tracking of test point

Time	Rise and exhale test point	Serving cell	Distance D i
					Orig1	CELL1
	Orig2
					Orig3

	Orig4	CELL2
	Orign	CELLm

Wherein m is the number of total Serving cell, and n is that test point number is exhaled in corresponding the rising in each Serving cell.

Based on table 1, table 2 can according to Serving cell, by the distance d of the collection of the drive test test of each test point corresponding _ithe distance D of the Serving cell of following the tracks of with backstage _iassociate, form result shown in table 3:

Table 3: the distance list in the drive test data that test point is corresponding and the measurement data that backstage is followed the tracks of

In described step 1, according to the drive test data that table 3 records, the los path time delay τ of each test point can be obtained _i=d _i/ c, c are the approximate light velocity.In drive test data, comprise the latitude and longitude information that MS (MobileStation, travelling carriage) is actual, therefore for i-th test point of Serving cell statistics, can the actual range d of accurate Calculation travelling carriage and Serving cell _irice, the propagation distance namely under sighting distance LOS environment, then los path time delay can be defined as τ _i=d _i/ c.

In described step 1, according to the test data that table 3 records, the reverse link time delay T of each test point can be obtained _i=D _i/ c, wherein D _ifor the distance that the reverse link time delay of backstage statistics is corresponding.In the measurement data that backstage is followed the tracks of, for i-th test point, the reverse link time delay making backstage add up is T _i, then T can be determined _i=D _i/ c.

Described reverse link time delay T _i, comprising: the feed line length of base station, the reverse hardware time delay ξ of equipment, the time delay that the factor that the device channel plate demodulation time etc. affects positioning precision causes.The reverse hardware time delay ξ of described equipment tests out in laboratory before equipment dispatches from the factory.In theory, described reverse link time delay T _icomprise all hardware-related time delays and spatial time delay.Reverse link time delay T _ibe that system realizes automatically according to corresponding algorithm, it can report reverse link time delay T by system to backstage _ior the distance D of correspondence _i.

In described step 2, in order to obtain the described average delay error of single Serving cell, need to calculate reverse link time delay T to each test point _iwith los path time delay τ _ierror.After the error obtaining each test point, the error amount of all test points corresponding to single Serving cell is being sued for peace, and then is being averaged, thus obtaining described average delay error and be:

${\mathrm{\τ}}^{/}=\mathrm{Average}\left(\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(T_i-\mathrm{\ξ}-d_i/c)\right)$

Wherein, ξ is the reverse hardware time delay of equipment before dispatching from the factory, and n is test point number corresponding to Serving cell.

At present, the measurement data that backstage is followed the tracks of carries out the reverse link time delay T that statistical analysis obtains _i, generally comprise: the time delay such as spacial sight-distance LOS link delay, non line of sight NLOS link delay, feeder line time delay.Drive test data can be utilized to calculate i.e. τ for spacial sight-distance LOS link delay wherein _i, and can accurately obtain because of los path time delay, thus, this error mean of gained τ ' is exactly the average delay error of the time delay such as reverse hardware time delay of the demodulation of device channel plate, feeder line time delay, equipment.

In step 3, the reverse hardware time delay ξ ' of the equipment revised can be obtained according to this average delay error τ ':

ξ′＝τ′+ξ

Wherein, ξ is the reverse hardware time delay of equipment before dispatching from the factory.

The statistics of the test data that the present invention mainly follows the tracks of according to drive test data and backstage, the reverse hardware time delay of the equipment of all communities is revised, reduce the impact of the factors such as the demodulation of device channel plate, feeder line time delay, the reverse hardware time delay of equipment, improve wireless cellular system positioning precision.In actual applications, when utilizing the counter-directional device time delay revised to position, significantly can improve positioning precision, in an application case, positioning precision error mean brings up to 325 meters by 612 meters before revising, in Another Application case, positioning precision error mean brings up to 245 meters by 538 meters before revising.

Based on the method for above-mentioned raising wireless cellular system positioning precision, as shown in Figure 2, a kind of device improving wireless cellular system positioning precision of the present invention, comprising:

Drive test data collection analysis module, for gathering drive test data, carries out by road test data the los path time delay τ that statistical analysis obtains each test point _i=d _i/ c;

Back-end data collection analysis module, for gathering the test data that backstage is followed the tracks of, carries out by the test data of following the tracks of backstage the reverse link time delay T that statistical analysis obtains each test point _i=D _i/ c;

Error calculating module, be averaged after suing for peace for the difference of the reverse hardware time delay gained reverse link time delay of each corresponding for single Serving cell test point being deducted los path time delay and equipment, the average delay error obtaining this Serving cell is:

${\mathrm{\τ}}^{/}=\mathrm{Average}\left(\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(T_i-\mathrm{\ξ}-d_i/c)\right)$

Wherein, ξ is the reverse hardware time delay of equipment before dispatching from the factory, and n is test point number corresponding to Serving cell;

Time delay correcting module, for utilizing the reverse link time delay of described average delay error to Serving cell to revise, using the reverse hardware time delay of the reverse hardware delayed addition sum of described average delay error and equipment as the correction of this Serving cell:

ξ′＝τ′+ξ

Wherein, ξ is the reverse hardware time delay of equipment before dispatching from the factory.

Described test point is and works the test point of exhaling, switching the moment of message corresponding.Described drive test data collection analysis module is the los path time delay obtaining each test point according to the actual range of travelling carriage and Serving cell divided by the approximate light velocity.Described back-end data collection analysis module, the reverse link time delay of each test point is that system realizes automatically according to corresponding algorithm.

The foregoing is only embodiments of the invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.

Claims (8)

1. improve a method for wireless cellular system positioning precision, it is characterized in that, comprising:

Gather the test data of drive test data and backstage tracking, carry out by road test data the los path time delay that statistical analysis obtains each test point, carry out by the test data of following the tracks of backstage the reverse link time delay that statistical analysis obtains each test point;

The difference reverse link time delay of each corresponding for single Serving cell test point deducted after the reverse hardware time delay of los path time delay and equipment is averaged after suing for peace, and obtains the average delay error of this Serving cell;

The reverse hardware time delay of described average delay error to the equipment of Serving cell is utilized to revise, using the reverse hardware time delay of the reverse hardware delayed addition sum of average delay error and equipment as the correction of this Serving cell.

2. the method for claim 1, is characterized in that,

Described test point is and works the test point of exhaling, switching the moment of message corresponding.

3. the method for claim 1, is characterized in that,

The los path time delay of described each test point is obtained divided by the approximate light velocity by the actual range of travelling carriage and Serving cell;

The reverse link time delay of described each test point is that system realizes automatically according to corresponding algorithm.

4. the method for claim 1, is characterized in that,

Described reverse link time delay, comprising: the reverse hardware time delay of non line of sight delay time error, device channel plate demodulation time, feeder line time delay, equipment.

5. improve a device for wireless cellular system positioning precision, it is characterized in that, comprising:

Drive test data collection analysis module, for gathering drive test data, carries out by road test data the los path time delay that statistical analysis obtains each test point;

Back-end data collection analysis module, for gathering the test data that backstage is followed the tracks of, carries out by the test data of following the tracks of backstage the reverse link time delay that statistical analysis obtains each test point;

Error calculating module, is averaged after suing for peace, obtains the average delay error of this Serving cell for the difference of the reverse hardware time delay gained reverse link time delay of each corresponding for single Serving cell test point being deducted los path time delay and equipment;

Time delay correcting module, for utilizing the reverse hardware time delay of described average delay error to the equipment of Serving cell to revise, using the reverse hardware time delay of the reverse hardware delayed addition sum of described average delay error and equipment as the correction of this Serving cell.

6. device as claimed in claim 5, is characterized in that,

Described test point is and works the test point of exhaling, switching the moment of message corresponding.

7. device as claimed in claim 5, is characterized in that,

Described drive test data collection analysis module is the los path time delay obtaining each test point according to the actual range of travelling carriage and Serving cell divided by the approximate light velocity.

8. device as claimed in claim 5, is characterized in that,

The reverse link time delay of each test point that described back-end data collection analysis module gathers is that system realizes automatically according to corresponding algorithm.