CN104378739A - Positioning method and device based on LTE system - Google Patents
Positioning method and device based on LTE system Download PDFInfo
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- CN104378739A CN104378739A CN201410691230.7A CN201410691230A CN104378739A CN 104378739 A CN104378739 A CN 104378739A CN 201410691230 A CN201410691230 A CN 201410691230A CN 104378739 A CN104378739 A CN 104378739A
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Abstract
The embodiment of the invention provides a positioning method and device based on an LTE system and relates to the communication field. The positioning method and device solve the problem that high-precision indoor positioning cannot be conducted on a terminal to be positioned in the prior art. According to the scheme, the method includes the step of obtaining sounding reference signals (SRSs) sent by a first terminal and received by M antenna points, wherein the first terminal is any one of N terminals within the coverage area of the M antenna points, the step of converting the SRSs received by the M antenna points into M digital signals, the step of determining times when the SRSs sent by the first terminal arrive at the M antenna points according to the M digital signals and preset ZC information of the N terminals, and the step of adopting the TDOA technology to calculate position information of the first terminal according to the times when the SRSs sent by the first terminal arrive at the M antenna points.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of localization method based on LTE (Long TermEvolution, Long Term Evolution) system and device.
Background technology
At present, in LTE system, the localization method for the user terminal under indoor scene mainly utilizes TDOA (Time difference of Arrival, poor based on the time of advent) technology.TDOA technology is a kind of wireless location technology, and the measuring-signal that it can be sent by terminal to be positioned arrives the time of base station, and determine the positional information of terminal to be positioned, its specific formula for calculation is as follows:
Wherein, t
1-t
2the measuring-signal sent for terminal to be positioned arrives base station 1 respectively, and (its positional information is (x1,) and (its positional information is (x2 in base station 2 y1), y2) time difference), the positional information (i.e. the positional information of terminal to be positioned) that (x, y) is signal source.
Concrete, in prior art when utilizing TDOA technology to carry out indoor positioning, require that the rarest three base stations are carried out co-operation and could be realized indoor positioning, this just requires this three base stations for indoor positioning Complete Synchronization in time.
But, in existing mobile communication system, base station in time be synchronously by outer GPS (the Global Positioning System of installation room, global positioning system) antenna realizes, due to the error that the position of outdoor gps antenna exists, and it connects the difference of the antenna feeder length of base station, make error between each base station when carrying out synchronous about 2.5-3 μ s, this positional information of terminal to be positioned just making base station finally locate and obtain at least differs 30 meters with the actual position information of terminal to be positioned, therefore, above-mentioned indoor orientation method cannot realize treating locating terminal and carry out high accuracy indoor positioning.
Summary of the invention
Embodiments of the invention provide a kind of localization method based on LTE system and device, solve in prior art and cannot treat the problem that locating terminal carries out high accuracy indoor positioning.
For achieving the above object, embodiments of the invention adopt following technical scheme:
First aspect, embodiments of the invention provide a kind of localization method based on LTE system, comprising:
Obtain M antenna point and receive the detection reference signal SRS signal that first terminal sends, described first terminal be a described M antenna point coverage in N number of terminal in any one terminal, M be greater than 2 integer, N be greater than 0 integer;
Respectively the SRS signal that a described M antenna point receives is converted to M digital signal;
According to the ZC code information of described N number of terminal preset in described digital signal and described community, determine that SRS signal that described first terminal sends arrives the time of a described M antenna point respectively;
The SRS signal sent according to described first terminal arrives the time of a described M antenna point respectively, uses the positional information of first terminal described in TDOA technique computes.
In conjunction with first aspect, in the first possible implementation of first aspect, before the SRS signal being received first terminal transmission by M antenna point respectively, also comprise:
Obtain the user profile of N number of terminal from base station, described user profile at least comprises the ZC code information of N number of terminal.
In conjunction with first aspect, in the implementation that the second of first aspect is possible, respectively the SRS signal that a described M antenna point receives is converted to digital signal, comprises:
Respectively high frequency sampling is carried out to the SRS signal that a described M antenna point receives, obtains M SRS signal after sampling;
Analog-to-digital conversion is carried out to the M after described sampling SRS signal, obtains M digital signal after conversion.
In conjunction with the implementation that the second of first aspect is possible, in the third possible implementation of first aspect, according to the ZC code information of N number of terminal in a described M digital signal and preset described community, determine that SRS signal that described first terminal sends arrives the time of a described M antenna point respectively, comprising:
Each digital signal in a described M digital signal is carried out related operation with the ZC code information of described N number of terminal respectively;
According to the result of described related operation, determine the time occurring maximum correlation peaks with described each digital signal;
Occur that the time of maximum correlation peaks is defined as the time that SRS signal that described first terminal sends arrives described each antenna point by with described each digital signal.
In conjunction with the third possible implementation of first aspect, in the 4th kind of possible implementation of first aspect, after use calculates the positional information of described first terminal based on the difference TDOA time of advent, also comprise:
The positional information of described first terminal is sent to base station, to make described base station, described positional information is issued to described first terminal.
Second aspect, embodiments of the invention provide a kind of location computing device, comprising:
Receiving element, the detection reference signal SRS signal that the first terminal received for obtaining M antenna point sends, described first terminal be a described M antenna point coverage in N number of terminal in any one terminal, M be greater than 2 integer, N be greater than 0 integer;
Signal processing unit, is converted to M digital signal for the SRS signal received M antenna point in described receiving element;
Dependent processing unit, for the ZC code information according to the digital signal in described signal processing unit and preset described N number of terminal, determines that SRS signal that described first terminal sends arrives the time of a described M antenna point respectively;
Position calculation unit, the SRS signal for sending according to first terminal in described dependent processing unit arrives the time of a described M antenna point respectively, uses the positional information of first terminal described in TDOA technique computes.
In conjunction with second aspect, in the first possible implementation of second aspect,
Described receiving element, also for obtaining the user profile of N number of terminal from base station, described user profile at least comprises the ZC code information of N number of terminal.
In conjunction with second aspect, in the implementation that the second of second aspect is possible,
Described signal processing unit, carries out high frequency sampling respectively specifically for the SRS signal received a described M antenna point, obtains M SRS signal after sampling; Respectively analog-to-digital conversion is carried out to the M after described sampling SRS signal, obtain M digital signal after conversion.
In conjunction with the implementation that the second of second aspect is possible, in the third possible implementation of second aspect,
Described dependent processing unit, specifically for carrying out related operation with the ZC code information of described N number of terminal respectively by each digital signal in a described M digital signal; According to the result of described related operation, determine the time occurring maximum correlation peaks with described each digital signal; Occur that the time of maximum correlation peaks is defined as the time that SRS signal that described first terminal sends arrives described each antenna point by with described each digital signal.
In conjunction with the third possible implementation of second aspect, in the 4th kind of possible implementation of second aspect, described location computing device also comprises transmitting element, wherein,
Described transmitting element, for the positional information of the first terminal in described position calculation unit is sent to base station, is issued to described first terminal to make described base station by described positional information.
Embodiments of the invention provide a kind of localization method based on LTE system and device, the detection reference signal SRS signal of first terminal transmission is received respectively by M antenna point, and then according to the ZC code information of terminal N number of in community, determine that SRS signal that first terminal sends arrives the time of a described M antenna point respectively, so that use TDOA to calculate the positional information of described first terminal, and, because the multiple antennas point in existing indoor distributed system provides service by a base station, so, the SRS signal of the multiple antennas point in this indoor distributed system and terminal is used to carry out terminal positioning, only need a base station just can determine the position of first terminal, therefore do not need requirement precisely synchronous as the height carried out in prior art between base station, just can improve the accuracy of terminal positioning, solve in prior art and cannot treat the problem that locating terminal carries out high accuracy indoor positioning.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The system architecture diagram of a kind of localization method based on LTE system that Fig. 1 provides for the embodiment of the present invention;
The schematic flow sheet one of a kind of localization method based on LTE system that Fig. 2 provides for the embodiment of the present invention;
The schematic flow sheet two of a kind of localization method based on LTE system that Fig. 3 provides for the embodiment of the present invention;
The schematic flow sheet three of a kind of localization method based on LTE system that Fig. 4 provides for the embodiment of the present invention;
The hardware schematic diagram of a kind of location computing device that Fig. 5 provides for embodiments of the invention;
The structural representation one of a kind of location computing device that Fig. 6 provides for embodiments of the invention;
The structural representation two of a kind of location computing device that Fig. 7 provides for embodiments of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, be the system architecture diagram being applied to the localization method based on LTE system that the embodiment of the present invention provides.Indoor baseband processing unit (BBU is included in this system, Building Base band Unite), location computing device (LCU, locationcalculation unit) and first terminal (UE, user equipment).Wherein, described first terminal is any one terminal in terminal N number of in community; Indoor distributed system, for indoor user group, for improving the successful scheme of the one of mobile communication environment in building, it utilizes domestic aerial that the signal of mobile base station is evenly distributed on indoor every nook and cranny, thus ensures that room area has good quorum sensing inhibitor.Indoor distributed system can be divided into radio-frequency (RF) passive compartment system, radio frequency active compartment system, optical fiber distribution system and leakage cable distribution system etc. according to transmission medium, the embodiment of the present invention does not impose any restrictions this.
Concrete, BBU is connected with the antenna point of the M in indoor distributed system by feeder line, and BBU is responsible for providing the user profile such as ZC (Zadoff-Chu) the code information of N number of terminal in community can be connected by antenna feeder between LCU, BBU and LCU.Wherein, because the ZC sequence in ZC code information has good autocorrelation, the cross correlation of ZC sequence and other signals is very low simultaneously, and therefore ZC code information is usually used in the synchronized algorithm of communication system.Exemplary, in the ZC code information of N number of terminal, the degree of correlation of SRS signal both only when the ZC code information with first terminal carries out related operation that first terminal (in N number of terminal any one) sends there will be maximum correlation peaks, because the degree of correlation is each other 0 when carrying out related operation with the ZC code information of other-end, therefore there will not be maximum correlation peaks.
LCU is connected with the antenna point of the M in indoor distributed system by proprietary antenna feeder, wherein, M antenna point is responsible for SRS (the sounding referencesignal receiving first terminal, detection reference signal), after LCU gets the SRS signal of first terminal transmission by M antenna point, signal transacting is carried out to the SRS signal that first terminal sends, and extract according to related algorithm the time that M antenna point receives this SRS signal respectively, thus the SRS signal calculating first terminal transmission arrives the time of a described M antenna point respectively, and then the SRS signal obtaining first terminal transmission arrives the time difference between every two antenna points respectively, TDOA is used to calculate the positional information of described first terminal to make LCU according to M the antenna point time difference received respectively between the SRS signal of first terminal transmission, solve in prior art and cannot treat by base station synchronization high accuracy the problem that locating terminal carries out indoor positioning.
Embodiment one
Embodiments of the invention provide a kind of localization method based on LTE system, as shown in Figure 2, comprising:
101, location computing device obtains the SRS signal of the first terminal transmission that M antenna point receives, this first terminal be M antenna point coverage in N number of terminal in any one terminal.
102, the SRS signal that M antenna point receives is converted to M digital signal by location computing device respectively.
103, location computing device is according to the ZC code information of M digital signal and preset N number of terminal, determines that SRS signal that first terminal sends arrives the time of M antenna point respectively.
104, location computing device arrives the time of M antenna point respectively according to the SRS signal that first terminal sends, and uses the positional information of TDOA technique computes first terminal.
Concrete, in a step 101, M antenna point in indoor distributed system can receive the SRS signal that first terminal periodically sends, due to the distance between first terminal and M antenna point not etc., therefore, can by determining that SRS signal that first terminal sends arrives the time of M antenna point respectively, first terminal is positioned, so, terminal positioning is carried out owing to utilizing the SRS signal of the multiple antennas point in existing indoor distributed system and terminal, therefore the height not needing requirement picture to carry out in the prior art between base station is precisely synchronous, just can improve the accuracy of terminal positioning, wherein, M be greater than 2 integer, N be greater than 0 integer.
Wherein, SRS signal can be used for the selection of estimation to uplink signal-channel quality and channel, such as, can calculate the SINR (Signal toInterference plus Noise Ratio, Signal to Interference plus Noise Ratio) of up channel according to SRS signal.
In a step 102, after location computing device to receive the SRS signal that first terminal sends respectively by M antenna point, in order to determine that SRS signal that first terminal sends arrives the time of M antenna point respectively, first location computing device needs the SRS signal received by M antenna point to be converted to M digital signal.
Concrete, location computing device first can carry out high frequency sampling to the SRS signal that each antenna point receives, and obtains the SRS signal after sampling; Because the SRS signal after sampling is a discrete analog signal, therefore, location computing device needs the SRS signal after to sampling to carry out analog-to-digital conversion again, and obtain the digital signal after conversion, final position computing equipment gets the digital signal after M conversion.
Optionally, the sample frequency of SRS signal being carried out to high frequency sampling can be 300 hertz, the ZC code information of SRS signal and N number of terminal can be made under this sample frequency to carry out the result of related operation comparatively accurate, the sample frequency of certainly carrying out high frequency sampling to SRS signal can also be other frequencies, and the present invention does not limit this.
In step 103, after the SRS signal that M antenna point receives by location computing device is converted to M digital signal, according to the ZC code information of N number of terminal in M digital signal and preset community, determine that SRS signal that first terminal sends arrives the time of M antenna point respectively.
Concrete, location computing device is before the SRS signal being received first terminal transmission by M antenna point respectively, get the user profile of N number of terminal, wherein, user profile can comprise the ZC code information of N number of terminal and the ID of N number of terminal, exemplary, location computing device can record the positional information of terminal after positioning respectively according to the ID of N number of terminal, so that upgrade in time to the terminal positional information database of location computing device.
After the SRS signal received by M antenna point at location computing device is converted to digital signal, the digital signal that each antenna point receives by location computing device carries out related operation with the ZC code information of N number of terminal respectively, exemplary explanation is carried out below with in M antenna point, concrete, the digital signal that first antenna point receives by location computing device carries out related operation with the ZC code information of N number of terminal respectively, the SRS signal of first terminal transmission received due to the first antenna point and the ZC code information of first terminal there will be maximum correlation peaks when carrying out related operation, and when carrying out related operation with the ZC code information of other-end, there will not be maximum correlation peaks, therefore, location computing device is according to the result of related operation, determine that the time of maximum correlation peaks appears in the digital signal received with the first antenna point, and will occur that the time of this maximum correlation peaks is defined as the SRS signal that first terminal sends and arrives time of the first antenna point, according to the method described above, location computing device just can determine that SRS signal that first terminal sends arrives the time of M antenna point respectively.
At step 104, after execution step 103, location computing device arrives the time of M antenna point respectively according to the SRS signal that first terminal sends, and uses TDOA to calculate the positional information of first terminal.
Exemplary, if the time point that location computing device arrives M (supposing M=3) individual antenna point respectively according to the SRS signal that first terminal sends is respectively T
1, T
2and T
3, so, utilize the computational methods of the traditional TDOA difference time of advent, use following formula to calculate the position of first terminal.
Wherein, in equation (x1, y1), (x2, y2) and (x3, y3) be the coordinate of antenna point 1,2 and 3 respectively, c is known constant item, so can be calculated the coordinate position of first terminal (x, y), namely obtain the positional information of first terminal.
Embodiments of the invention provide a kind of localization method based on LTE system, the detection reference signal SRS signal of first terminal transmission is received respectively by M antenna point, and then according to the ZC code information of terminal N number of in community, determine that SRS signal that first terminal sends arrives the time of a described M antenna point respectively, so that use TDOA to calculate the positional information of described first terminal, and, because the multiple antennas point in existing indoor distributed system provides service by a base station, so, the SRS signal of the multiple antennas point in this indoor distributed system and terminal is used to carry out terminal positioning, only need a base station just can determine the position of first terminal, therefore do not need requirement precisely synchronous as the height carried out in prior art between base station, just can improve the accuracy of terminal positioning, solve in prior art and cannot treat the problem that locating terminal carries out high accuracy indoor positioning.
Embodiment two
Embodiments of the invention provide a kind of localization method based on LTE system, as shown in Figure 3, comprising:
201, location computing device obtains the user profile of N number of terminal, and this user profile at least comprises the ZC code information of N number of terminal.
202, location computing device obtains the SRS signal that M antenna point receives first terminal transmission, this first terminal be M antenna point coverage in N number of terminal in any one terminal.
203, the SRS signal that M antenna point receives is converted to M digital signal by location computing device respectively.
204, location computing device is according to the ZC code information of N number of terminal in M digital signal and preset community, determines that SRS signal that first terminal sends arrives the time of M antenna point respectively.
205, location computing device arrives the time of M antenna point respectively according to the SRS signal that first terminal sends, and uses TDOA to calculate the positional information of first terminal.
206, the positional information of first terminal is sent to base station by location computing device, to make base station, positional information is issued to first terminal.
Concrete, in step 201, location computing device can get the user profile of N number of terminal in community from base station, and this user profile can comprise the ZC code information of N number of terminal.So, after the SRS signal that any terminal (such as first terminal) got in N number of terminal at location computing device sends, the SRS signal that the SRS signal that just can send based on first terminal and the autocorrelation determination first terminal of ZC code information of preset first terminal send arrives the time point of M antenna point respectively, M be greater than 2 integer, N be greater than 0 integer.
In addition, this user profile can also comprise the ID of N number of terminal, exemplary, location computing device can record the positional information of terminal after positioning respectively according to the ID of N number of terminal, so that upgrade in time to the terminal positional information database of location computing device.
Certainly, location computing device can also get the user profile of N number of terminal in community from each UE, the present invention is not restricted this.
In step 202., M antenna point in indoor distributed system can receive the SRS signal that first terminal periodically sends, due to the distance between first terminal and M antenna point not etc., therefore, by determining that the SRS signal of first terminal transmission in one-period arrives the time of M antenna point respectively, first terminal can be positioned.
In step 203, after location computing device to receive the SRS signal that first terminal sends respectively by M antenna point, in order to determine that SRS signal that first terminal sends arrives the time of M antenna point respectively, first computing equipment needs the SRS signal received by M antenna point to be respectively converted to M digital signal.
Concrete, as shown in Figure 4, SRS signal for the transmission of location computing device determination first terminal arrives the design diagram of the time of M antenna point respectively, after location computing device receives the SRS signal of M antenna point transmission, sampling filter first can be used to carry out high frequency sampling to the SRS signal that each antenna point receives respectively, obtain the discrete analog(ue) SRS signal after sampling; And then analog-to-digital conversion is carried out to the discrete analog(ue) SRS signal after sampling, obtain the digital signal after conversion.
Optionally, the sample frequency of SRS signal being carried out to high frequency sampling can be 300 hertz, the ZC code information of SRS signal and N number of terminal can be made under this sample frequency to carry out the result of related operation more accurate, the sample frequency of certainly carrying out high frequency sampling to SRS signal can also be other frequencies, and the present invention does not limit this.
In step 204, after location computing device obtains M digital signal after signal transacting, according to the ZC code information of M digital signal and N number of terminal, determine that SRS signal that first terminal sends arrives the time of M antenna point respectively.
As shown in Figure 4, after M digital signal after location computing device obtains signal transacting, digital signal corresponding for each antenna point is input in N number of interlock circuit by location computing device respectively, carries out related operation (N is the number of terminals in community) from the ZC sequence in N number of different ZC code information.Concrete, location computing device can judge in the interlock circuit of antenna point 1, whether the ZC code information of the SRS signal that first terminal sends and N number of terminal obtains maximum correlation peaks, if there is this maximum correlation peaks, then the SRS signal time point that this maximum correlation peaks occurs being defined as first terminal transmission reaches the time point T of antenna point 1
1.
So, what location computing device can walk abreast calculates the time point T that any antenna point i (i≤M) in M antenna point receives the SRS signal that first terminal sends
i.
In step 205, after performing step 204, location computing device arrives the time of M antenna point respectively according to the SRS signal that first terminal sends, and uses TDOA to calculate the positional information of first terminal.
Exemplary, if the time point that location computing device arrives M (supposing M=3) individual antenna point respectively according to the SRS signal that first terminal sends is respectively T
1, T
2and T
3, so, utilize the computational methods of the traditional TDOA difference time of advent, use following formula to calculate the position of first terminal.
Wherein, in equation (x1, y1), (x2, y2) and (x3, y3) be the coordinate of antenna point 1,2 and 3 respectively, c is known constant item, so can be calculated the co-ordinate position information of first terminal (x, y), namely obtain the positional information of first terminal.
In step 206, after location computing device calculates the positional information of first terminal, the positional information of first terminal is sent to base station, to make base station, positional information is issued to first terminal, like this, what do not need by base station is synchronous, and first terminal just can obtain self positional information accurately, improves the accuracy of terminal positioning.
Embodiments of the invention provide a kind of localization method based on LTE system, the detection reference signal SRS signal of first terminal transmission is received respectively by M antenna point, and then according to the ZC code information of terminal N number of in community, determine that SRS signal that first terminal sends arrives the time of a described M antenna point respectively, so that use TDOA to calculate the positional information of described first terminal, and, because the multiple antennas point in existing indoor distributed system provides service by a base station, so, the SRS signal of the multiple antennas point in this indoor distributed system and terminal is used to carry out terminal positioning, only need a base station just can determine the position of first terminal, therefore do not need requirement precisely synchronous as the height carried out in prior art between base station, just can improve the accuracy of terminal positioning, solve in prior art and cannot treat the problem that locating terminal carries out high accuracy indoor positioning.
Embodiment three
As shown in Figure 5, for embodiments of the invention provide a kind of hardware schematic diagram of location computing device.
Shown location computing device (location calculation unit, LCU) be connected with the antenna point of the M in compartment system by proprietary feeder line, location computing device is by the SRS signal of M antenna point receiving terminal, extract the time point of the SRS signal that same terminal receives between different antennae point, calculate the time difference that different antennae point receives SRS signal, so that the positional information using TDOA to calculate described first terminal.
As Fig. 5, described location computing device comprises processor 11, transceiver 12, memory 13, sampling filter 14 and bus 15.
Wherein, processor 11, transceiver 12, memory 13 and sampling filter 14 are communicated to connect by bus 15.
Processor 11 is control centres of described location computing device, and processor 11 is by processing the data that transceiver 12 receives, and the software called in memory 13 or program, perform the various functions of described location computing device.
Transceiver 12, can be used for receiving and sending messages or in communication process, the reception of signal and transmission, after the information that transceiver 12 receiving terminal sends, process to processor 11; In addition, transceiver 12 can by radio communication and network and other devices communicatings.Described radio communication can use arbitrary communication standard or agreement, include but not limited to GSM (Global System of Mobilecommunication, global system for mobile communications), GPRS (General Packet RadioService, general packet radio service), CDMA (Code Division MultipleAccess, code division multiple access), WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA)), LTE (Long Term Evolution, Long Term Evolution).
Memory 13, can be used for storing software program or data, and processor 11 is stored in software program or the data of memory 13 by running, thus performs various function application and the data processing of described location computing device.
In embodiments of the present invention, transceiver 12 obtains the SRS signal of the first terminal transmission that M antenna point receives and is sent to processor 11, described first terminal be a described M antenna point coverage in N number of terminal in any one terminal, M be greater than 2 integer, N be greater than 0 integer; The SRS signal that a described M antenna point receives is converted to M digital signal by processor 11 respectively; Processor 11, according to the ZC code information of a described M digital signal and described N number of terminal, determines that SRS signal that described first terminal sends arrives the time of a described M antenna point respectively; Processor 11 arrives the time of a described M antenna point respectively according to the SRS signal that described first terminal sends, and uses the positional information of first terminal described in TDOA technique computes.
Further, before transceiver 12 to receive the SRS signal that first terminal sends respectively by M antenna point, can also comprise step: transceiver 12 obtains the user profile of N number of terminal and is stored to memory 13 from base station, described user profile at least comprises the ZC code information of N number of terminal.
Further, the SRS signal that a described M antenna point receives is converted to M digital signal by processor 11 respectively, specifically can comprise step: processor 11 carries out high frequency sampling by sampling filter 14 to the SRS signal that a described M antenna point receives, obtain M SRS signal after sampling; And analog-to-digital conversion is carried out to the M after described sampling SRS signal, obtain M digital signal after conversion.
Optionally, the sample frequency of described sampling filter 14 can be 300 hertz.
Further, processor 11 is according to the ZC code information of N number of terminal in a described M digital signal and preset described community, determine that SRS signal that described first terminal sends arrives the time of a described M antenna point respectively, specifically can comprise step: each digital signal in a described M digital signal is carried out related operation with the ZC code information of described N number of terminal by processor 11 respectively; Processor 11, according to the result of described related operation, determines the time occurring maximum correlation peaks with described each digital signal; By with described each digital signal, processor 11 occurs that the time of maximum correlation peaks is defined as the time that SRS signal that described first terminal sends arrives described each antenna point.
Further, after processor 11 uses the positional information of first terminal described in TDOA technique computes, can also step be comprised: the positional information of described first terminal is sent to base station by transceiver 12, to make described base station, described positional information is issued to described first terminal.
Embodiments of the invention provide a kind of location computing device, the detection reference signal SRS signal of first terminal transmission is received respectively by M antenna point, and then according to the ZC code information of terminal N number of in community, determine that SRS signal that first terminal sends arrives the time of a described M antenna point respectively, so that use TDOA to calculate the positional information of described first terminal, and, because the multiple antennas point in existing indoor distributed system provides service by a base station, so, the SRS signal of the multiple antennas point in this indoor distributed system and terminal is used to carry out terminal positioning, only need a base station just can determine the position of first terminal, therefore do not need requirement precisely synchronous as the height carried out in prior art between base station, just can improve the accuracy of terminal positioning, solve in prior art and cannot treat the problem that locating terminal carries out high accuracy indoor positioning.
Embodiment four
Embodiments of the invention provide a kind of location computing device, as shown in Figure 6, comprising:
Receiving element 21, the detection reference signal SRS signal of first terminal transmission is received for obtaining M antenna point, described first terminal be a described M antenna point coverage in N number of terminal in any one terminal, M be greater than 2 integer, N be greater than 0 integer;
Signal processing unit 22, for being converted to M digital signal by the SRS signal that M antenna point in described receiving element 21 receives respectively;
Dependent processing unit 23, for the ZC code information according to M digital signal in described signal processing unit 22 and preset described N number of terminal, determines that SRS signal that described first terminal sends arrives the time of a described M antenna point respectively;
Position calculation unit 24, the SRS signal for sending according to first terminal in described dependent processing unit 23 arrives the time of a described M antenna point respectively, uses the positional information of first terminal described in TDOA technique computes.
Further, described receiving element 21, also for obtaining the user profile of N number of terminal, described user profile at least comprises the ZC code information of N number of terminal.
Further, described signal processing unit 22, carries out high frequency sampling specifically for the SRS signal received a described M antenna point, obtains M SRS signal after sampling; Analog-to-digital conversion is carried out to the M after described sampling SRS signal, obtains M digital signal after described signal transacting.
Further, described dependent processing unit 23, specifically for carrying out related operation with the ZC code information of described N number of terminal respectively by each digital signal in a described M digital signal; According to the result of described related operation, determine the time occurring maximum correlation peaks with described each digital signal; Occur that the time of maximum correlation peaks is defined as the time that SRS signal that described first terminal sends arrives described each antenna point by with described each digital signal.
Further, as shown in Figure 7, described location computing device also comprises transmitting element 25, wherein,
Described transmitting element 25, for the positional information of the first terminal in described position calculation unit 24 is sent to base station, is issued to described first terminal to make described base station by described positional information.
Embodiments of the invention provide a kind of location computing device, the detection reference signal SRS signal of first terminal transmission is received respectively by M antenna point, and then according to the ZC code information of terminal N number of in community, determine that SRS signal that first terminal sends arrives the time of a described M antenna point respectively, so that use TDOA to calculate the positional information of described first terminal, and, because the multiple antennas point in existing indoor distributed system provides service by a base station, so, the SRS signal of the multiple antennas point in this indoor distributed system and terminal is used to carry out terminal positioning, only need a base station just can determine the position of first terminal, therefore do not need requirement precisely synchronous as the height carried out in prior art between base station, just can improve the accuracy of terminal positioning, solve in prior art and cannot treat the problem that locating terminal carries out high accuracy indoor positioning.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (10)
1. based on a localization method for Long Term Evolution LTE system, it is characterized in that, comprising:
Obtain the detection reference signal SRS signal that first terminal that M antenna point receive sends, described first terminal be a described M antenna point coverage in N number of terminal in any one terminal, M be greater than 2 integer, N be greater than 0 integer;
Respectively the SRS signal that a described M antenna point receives is converted to M digital signal;
According to the ZC code information of a described M digital signal and described N number of terminal, determine that SRS signal that described first terminal sends arrives the time of a described M antenna point respectively;
The SRS signal sent according to described first terminal arrives the time of a described M antenna point respectively, uses the positional information based on first terminal described in time of advent difference TDOA technique computes.
2. method according to claim 1, is characterized in that, before the SRS signal being received first terminal transmission by M antenna point respectively, also comprises:
Obtain the user profile of N number of terminal, described user profile at least comprises the ZC code information of N number of terminal.
3. method according to claim 1, is characterized in that, describedly respectively the SRS signal that a described M antenna point receives is converted to M digital signal, comprising:
Respectively high frequency sampling is carried out to the SRS signal that a described M antenna point receives, obtains M SRS signal after sampling;
Respectively analog-to-digital conversion is carried out to the M after described sampling SRS signal, obtain M digital signal after conversion.
4. method according to claim 3, is characterized in that, the described ZC code information according to N number of terminal in a described M digital signal and described community, determines that SRS signal that described first terminal sends arrives the time of a described M antenna point respectively, comprising:
Each digital signal in a described M digital signal is carried out related operation with the ZC code information of described N number of terminal respectively;
According to the result of described related operation, determine the time occurring maximum correlation peaks with described each digital signal;
Occur that the time of maximum correlation peaks is defined as the time that SRS signal that described first terminal sends arrives described each antenna point by with described each digital signal.
5. method according to claim 4, is characterized in that, after use calculates the positional information of described first terminal based on the difference TDOA time of advent, also comprises:
The positional information of described first terminal is sent to base station, to make described base station, described positional information is issued to described first terminal.
6. a location computing device, is characterized in that, comprising:
Receiving element, the detection reference signal SRS signal that the first terminal received for obtaining M antenna point sends, described first terminal be a described M antenna point coverage in N number of terminal in any one terminal, M be greater than 2 integer, N be greater than 0 integer;
Signal processing unit, for being converted to M digital signal by the SRS signal that M antenna point in described receiving element receives respectively;
Dependent processing unit, for the ZC code information according to the digital signal in described signal processing unit and preset described N number of terminal, determines that SRS signal that described first terminal sends arrives the time of a described M antenna point respectively;
Position calculation unit, the SRS signal for sending according to first terminal in described dependent processing unit arrives the time of a described M antenna point respectively, uses the positional information based on differing from first terminal described in TDOA technique computes the time of advent.
7. location computing device according to claim 6, is characterized in that,
Described receiving element, also for obtaining the user profile of N number of terminal, described user profile at least comprises the ZC code information of N number of terminal.
8. location computing device according to claim 6, is characterized in that,
Described signal processing unit, carries out high frequency sampling respectively specifically for the SRS signal received a described M antenna point, obtains M SRS signal after sampling; Respectively analog-to-digital conversion is carried out to the M after described sampling SRS signal, obtain M digital signal after conversion.
9. location computing device according to claim 8, is characterized in that,
Described dependent processing unit, specifically for carrying out related operation with the ZC code information of described N number of terminal respectively by each digital signal in a described M digital signal; According to the result of described related operation, determine the time occurring maximum correlation peaks with described each digital signal; Occur that the time of maximum correlation peaks is defined as the time that SRS signal that described first terminal sends arrives described each antenna point by with described each digital signal.
10. location computing device according to claim 9, is characterized in that, described location computing device also comprises transmitting element, wherein,
Described transmitting element, for the positional information of the first terminal in described position calculation unit is sent to base station, is issued to described first terminal to make described base station by described positional information.
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| CN201410691230.7A CN104378739A (en) | 2014-11-26 | 2014-11-26 | Positioning method and device based on LTE system |
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| CN107920327A (en) * | 2016-10-08 | 2018-04-17 | 中兴通讯股份有限公司 | A kind of localization method, device and system, positioning signal determine method and terminal |
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| WO2023131192A1 (en) * | 2022-01-05 | 2023-07-13 | 中国移动通信有限公司研究院 | Location method and apparatus, base station, location server, and readable storage medium |
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