CN102131289A - LTE (long term evolution) terminal wireless positioning system based on quick time-delay parameter search - Google Patents

Abstract

The invention discloses an LTE (long term evolution) terminal wireless positioning system based on quick time-delay parameter search. In the invention, the positional parameter solution process comprises the following steps: performing frequency domain correlation operation between a received signal and a local signal in a frequency domain correlator (202); judging related peak values in a judging device (203), and sending feedback information to a data adjuster (204); obtaining the maximum peak value through judgment after sliding window transformation, and recording the position in which the peak value is located; reading data in a memory (205), sending the data to a time domain correlator (206) for time domain correlation operation so as to obtain the maximum related peak value, and recording a time delay position; suppressing NLOS influence of the signal by an NLOS (non-line-of-sight) suppressor (207); and finally calculating a target position in a calculator (208). The LTE terminal wireless positioning system is applicable to an LTE communication system, and has good application value in different noise interference environments; and relative to the traditional engineering system, the system has the advantages of fast positioning speed and high positioning precision, thus having wide engineering realization significance.

Description

A kind of LTE terminal wireless navigation system based on the fast delay time parameter search

Technical field

The invention belongs to communication technical field, as mobile communication, radio communication, particularly moving communicating fields such as " evolved 3G " wireless communication system, LTE radio honeycomb communication, WLAN (wireless local area network) carry out a kind of LTE terminal wireless navigation system based on the fast delay time parameter search that the target location is estimated to travelling carriage.

Background technology

LTE (Long Term Evolution, Long Term Evolution, by the popular 3.9G that is called, data download capabilities with 100Mbps, be considered the mainstream technology to 4G evolution) from 3G, LTE terminal wireless location is meant that mainly the LTE down link signal by resolving the base station transmission obtains the located in connection parameter, and then definite location of mobile station coordinate.Because uncertainty that wireless channel has, make wireless signal in transport process, can be subjected to factor affecting such as noise jamming, path loss, multipath fading and shadow fading, these interference will further cause the power attenuation and the time delay expansion of wireless signal, cause wireless location system to be difficult to reach high orientation precision.

As shown in Figure 1, wherein 101 is system's radio frequencies, the 102nd, and traditional time domain correlator, the 103rd, traditional frequency-domain correlator, the 104th, calculator is done last positioning calculation.The course of work that traditional positional parameter is found the solution: signal is after demodulation, directly carry out the time domain associative operation with local location reference signals, obtain the time delay rough estimate of signal, then, conversion of signals is arrived frequency domain, relevant by frequency domain, to the method that signal phase is corrected, obtain the accurate estimation of signal time delay.It is by carrying out related calculation with local signal to received signal, judge the relevant peaks position, obtaining delay parameter that traditional terminal is resolved the positional parameter method.At the LTE system, in the document " A Novel Location Finding System for 3GPP LTE " a kind of signal method of separating has been proposed.This method is found the solution delay parameter by the pilot signal and the local signal of Cell searching are done time-domain related calculation.The signal format of this method is simple, and utilizability is higher, and the hardware complexity of equipment is not high, is easy to realize, still, computation complexity is higher, and the time that one time delay time search consumed is longer, and iterations is too much, is unfavorable for the system that real-time is had relatively high expectations.In the document " A TDOA Location Scheme in OFDM Based WMANs " a kind of delay parameter method of separating at ofdm signal has been proposed.The document has been analyzed the method for demodulation multi-carrier signal more all sidedly, and in finding the solution for time delay, finding the solution of integer part time delay and fractional part time delay provided complete mathematical derivation.But this method biases toward theory analysis, and derivation is very complicated, and amount of calculation is bigger, is unfavorable for Project Realization, for the NLOS problem in the actual environment, also fails to provide clear and definite inhibition method.The 3G (Third Generation) Moblie technology enters commercial stage, is the focus that the LTE technology of core has become the communications industry with OFDM, in today of radio communication high speed development, real-time, easily realizes it being the target that system design is pursued.

Summary of the invention

Main purpose of the present invention is at above-mentioned problems of the prior art, and the LTE terminal wireless navigation system based on the fast delay time parameter search that a kind of locating speed is fast, positioning accuracy is high is provided.

In order to realize the foregoing invention purpose, the technical solution used in the present invention is as follows: a kind of LTE terminal wireless navigation system based on the fast delay time parameter search, comprise system's radio-frequency module, frequency-domain correlator, determining device, data adjuster, memory, the time domain correlator, NLOS inhibitor, calculator, after wherein system demodulates time-domain signal r, through Fourier transform, become frequency-region signal R, in frequency-domain correlator, to do frequency domain relevant with local signal, in determining device, do correlation peak and judge, and feedback information is given to data adjuster, do the sliding window conversion, judge and obtain peak-peak and note the peak value position, read the data in the memory, and be given to the time domain correlator and do time-domain related calculation, obtain the maximal correlation peak value and note delay positions, last signal is through the NLOS inhibitor, suppress the NLOS influence, and in calculator, calculate the target location.

Described frequency-domain correlator is to utilize the symbol cyclic prefix of LTE down link (CP, Cycle Prefix) part, makes that the each adjustment step-length of slip associated window is a CP length, and received signal and local signal are carried out related operation at frequency domain.

Described time domain correlator (206) will transform to time domain through the signal after the frequency domain correlation, and the each step-length of adjusting of slip associated window is 1 sampled point, and received signal and local signal are carried out related operation in time domain.

Described calculator 0.618 method is done the accurate estimation of delay parameter, with the twice sampled point x of received signal ₁, x ₂Carry out related calculation with local time-domain signal s (t) respectively, and bring in constant renewal in correlated results peak1, peak2, judge peak1, peak2, if peak1 〉=peak2, then x ₂To x ₁Direction moves 0.382 step-length, and upgrades x ₂Sampled point is designated as x3, if peak1＜peak2, then x ₁To x ₂Direction moves 0.382 step-length, and upgrades x ₁Sampled point is designated as x3; Sampled point x3 and local time-domain signal s (t) carry out related calculation, and obtain peak value peak3, and moment corresponding is designated as t3.

Described NLOS inhibitor (207) method that noise gate is set, suppress the NLOS noise, the average of first acquisition noise and local signal correlated results:

$\left\{\begin{array}{c}\mathrm{aver}=\frac{1}{M}\underset{j=0}{\overset{M-1}{\mathrm{\&Sigma;}}}{d}_j^2\\ {\mathrm{<figure-callout\; id="2"\; label="d\; j"\; filenames="HDA0000056294540000031.png"\; state="\{\{state\}\}">d</figure-callout>}}_j^{}=\underset{t=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{|s_w\left(t\right)\&times;n_j^{*}\left(t\right)|}^2,j=\mathrm{0,1},M-1\end{array}\right.$

Set up the end L that makes an uproar again, the end of making an uproar, with the pass of the relevant average of noise be:

$6\mathrm{dB}=10{\log }_{10}\frac{L}{\mathrm{aver}}$

At last, think that peak value directly is the LOS footpath of signal greater than article one relevant peaks of L, remaining is the NLOS footpath.

Compared with prior art, the invention has the beneficial effects as follows:

The present invention utilizes CP information and location reference signals, carries out related calculation to receiving signal by receiving terminal, tries to achieve delay parameter, and carries out the location of mobile station coordinate and resolve.Because whole process before Cell searching, so utilize CP information, helps the quick search of position reference; 0.618 the application of method helps the raising of time delay precision; NLOS inhibition method helps distinguishing of LOS footpath to received signal.More than three characteristics, make the present invention have very high engineering significance and commercial value; From system design view, it is few to have proposed a kind of iterations, is easy to the method for Project Realization.This method processing procedure is simple, and system is easy to realize, need not signal is taken multiple measurements, and need not to set up special database.In the complex environment of city, interference has good inhibition effect to NLOS, and the ability that conforms is strong, and is real-time; The present invention is used for the LTE cellular communications networks location of mobile station coordinate is estimated, can be in the short period of time, calculate the travelling carriage coordinate, under non-line-of-sight propagation (NLOS) serious environmental, method by the relevant peaks Threshold detection, determine line-of-sight propagation (LOS) directly, strengthen the anti-NLOS interference capability of navigation system.Promptly this system effectively utilizes the CP information in the LTE down link signal, is implemented on the time shaft the quick search to location reference signals; Utilize 0.618 method again, seek the related operation peak-peak, accurately the estimation time delay parameter; Utilize NLOS inhibition method then, can in the NLOS environment, pick out the LOS footpath of received signal; Set up the geometry location equation at last, solve the location of mobile station coordinate.The present invention is suitable for the LTE communication system, under different noise jamming environment excellent application value is arranged all, and with respect to traditional engineering system, the native system locating speed is fast, positioning accuracy is high, and Project Realization meaning is widely arranged.

Description of drawings

Fig. 1 is for adopting the wireless terminal location parametric solution figure of traditional approach;

Fig. 2 is a systematic schematic diagram of the present invention;

The 201st, system's radio-frequency module, the 202nd, frequency-domain correlator, the 203rd, determining device, the 204th, data adjuster, the 205th, memory, the 206th, time domain correlator, the 207th, NLOS inhibitor, the 208th, calculator;

Fig. 3 is the frequency-domain correlator among the present invention;

The 301st, memory, the 302nd, the FFT module, the 303rd, the local signal generator, 304 is one group of related operation device, the 305th, peak value determining device, the 306th, slip associated window adjuster;

Fig. 4 is the time domain correlator among the present invention;

The 401st, memory, the 402nd, the local signal generator, 403 is one group of related operation device, the 404th, peak value determining device, the 405th, slip associated window adjuster;

Fig. 5 is the smart estimation of a time delay diagrammatic sketch;

Fig. 6 is base station and the travelling carriage distribution diagrammatic sketch that participates in the location;

Fig. 7 is the platform building block diagram of system;

Fig. 8 is the system handles flow chart;

Fig. 9 is LTE system bandwidth and resource block number correspondence table;

Figure 10 is the parameter configuration in the system.

Embodiment:

Below in conjunction with embodiment foregoing invention content of the present invention is described in further detail.

But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment.Not breaking away under the above-mentioned technological thought situation of the present invention, according to ordinary skill knowledge and customary means, make various replacements and change, all should comprise within the scope of the invention.

See Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, shown in Figure 10, a kind of LTE terminal wireless navigation system based on the fast delay time parameter search, comprise system's radio-frequency module 201, frequency-domain correlator 202, determining device 203, data adjuster 204, memory 205, time domain correlator 206, NLOS inhibitor 207, calculator 208, after wherein system demodulates time-domain signal r, through Fourier transform, become frequency-region signal R, in frequency-domain correlator 202, to do frequency domain relevant with local signal, in determining device 203, do correlation peak and judge, and feedback information is given to data adjuster 204, do the sliding window conversion, judge and obtain peak-peak and note the peak value position, read the data in the memory 205, and be given to time domain correlator 206 and do time-domain related calculation, obtain the maximal correlation peak value and note delay positions, last signal is through NLOS inhibitor 207, suppress the NLOS influence, and in calculator 208, calculate the target location.

Described frequency-domain correlator 202 is to utilize the symbol cyclic prefix of LTE down link (CP, Cycle Prefix) part, makes that the each adjustment step-length of slip associated window is a CP length, and received signal and local signal are carried out related operation at frequency domain.

Described time domain correlator (206) will transform to time domain through the signal after the frequency domain correlation, and the each step-length of adjusting of slip associated window is 1 sampled point, and received signal and local signal are carried out related operation in time domain.

Described calculator 208 0.618 method is done the accurate estimation of delay parameter, with the twice sampled point x of received signal ₁, x ₂Carry out related calculation with local time-domain signal s (t) respectively, and bring in constant renewal in correlated results peak1, peak2, judge peak1, peak2, if peak1 〉=peak2, then x ₂To x ₁Direction moves 0.382 step-length, and upgrades x ₂Sampled point is designated as x3, if peak1＜peak2, then x ₁To x ₂Direction moves 0.382 step-length, and upgrades x ₁Sampled point is designated as x3; Sampled point x3 and local time-domain signal s (t) carry out related calculation, and obtain peak value peak3, and moment corresponding is designated as t3.

Described NLOS inhibitor 207 usefulness are provided with the method for noise gate, suppress the NLOS noise, gather earlier and make an uproar

The sound and the average of local signal correlated results:

$\left\{\begin{array}{c}\mathrm{aver}=\frac{1}{M}\underset{j=0}{\overset{M-1}{\mathrm{\&Sigma;}}}{d}_j^2\\ {\mathrm{<figure-callout\; id="2"\; label="d\; j"\; filenames="HDA0000056294540000031.png"\; state="\{\{state\}\}">d</figure-callout>}}_j^{}=\underset{t=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{|s_w\left(t\right)\&times;n_j^{*}\left(t\right)|}^2,j=\mathrm{0,1},M-1\end{array}\right.$

Set up the end L that makes an uproar again, the end of making an uproar, with the pass of the relevant average of noise be:

$6\mathrm{dB}=10{\log }_{10}\frac{L}{\mathrm{aver}}$

At last, think that peak value directly is the LOS footpath of signal greater than article one relevant peaks of L, remaining is the NLOS footpath.

The specific embodiment of the present invention is at practical engineering application, below by a concrete case, provides the specific operation process of LTE terminal wireless location.

Composition of the present invention: the positional parameter by the LTE wireless terminal is found the solution (comprising frequency-domain correlator 202, determining device 203, data adjuster 204, memory 205, time domain correlator 206 among Fig. 2), NLOS (non line of sight) and is disturbed and suppress (for the NLOS inhibitor 207 among Fig. 2), location of mobile station coordinate and resolve (for the calculator 208 among Fig. 2) three parts and forms, and the NLOS influence suppresses to carry out the error inhibition by NLOS inhibitor 207; The positioning calculation part is carried out the location of mobile station Coordinate Calculation by calculator 208.

One, positional parameter is found the solution the stage:

Positional parameter of the present invention is found the solution and is based on the frequency domain search pattern relevant with time domain fast, comprises radio frequency, demodulator, local signal generator, related operation device, memory.

The course of work of LTE wireless terminal location parametric solution: as shown in Figure 2, at first, system produces local signal, and the form of local signal is according to the agreement of sending and receiving end, and is identical with the position reference form of LTE originating terminal signal.Simultaneously with local reference signal as sliding window, length of window is a symbol lengths.Then, the signal that system's demodulation obtains from radio frequency, and with signal by correlation window length, do the frequency domain relevant treatment, repeat above step, judge the correlation peak of noting, find wherein maximum one, and this peaked moment t of record _C1, associated window slip scan number of times is

This is one of main innovate point of the present invention.Then, memory is according to feedback information, the time domain data of storage is passed through the related operation device, obtain the time domain relevant peaks, the sliding window pointwise is moved, and notes correlation peak, and judges maximum wherein, in order to find the starting point of position reference symbol better, local associated window slip scan scope is [t _C1-N _CP, t _C1+ N _CP), note the moment t at maximum place _C2, being time delay value, this is one of innovative point of the present invention.The maximum search number of times that whole search procedure consumed is At last, signal by the smart estimator of time delay, is obtained the accurate estimated result of time delay.

Frequency domain is the operation principle of search fast: as shown in Figure 3, the signal that system's demodulation obtains from radio frequency, system passes through sliding window successively with the time-domain signal r (t) that receives, the follow-up N that a receives data are done fast Fourier transform (FFT), transform to frequency domain, signal is done the frequency domain non-coherent accumulation, note correlation peak, and move CP (Cyclic Prefix) step-length N in time domain _CP, repeat above step, judge maximum correlation peak, and this peaked moment t of record _C1

The time domain search operation principle: as shown in Figure 4,, memory data is spread out of, does non-coherent accumulation, note maximal correlation peak value place constantly according to correlation window length according to feedback information.

The operation principle of the smart estimator of time delay (the smart estimator of time delay is positioned at calculator): the smart purpose of estimating of delay parameter is to allow receiving terminal that the estimation of delay parameter is reached higher precision.The time delay rough estimate can only be satisfied the time delay estimated accuracy in a sampling period, for more high precision time requirement, needs to carry out to received signal the smart estimation of time delay again and handles.As shown in Figure 5, at first, signal is done 2 samplings, then, sampled data is divided into two groups, respectively corresponding two groups of sampled point x ₁And x ₂Use 0.618 interpolation method then, sampled point is upgraded, obtain best correlation peak, and note correlation peak place t constantly _fThe t of this moment _fBe the final result that time delay is estimated.

Two, NLOS disturbs and suppresses

NLSO disturbs the operation principle that suppresses: carry out related calculation to the received signal, obtain correlation peak, under complicated urban environment, signal is owing to arrive receiving terminal (NLOS influence) through multipath transmisstion from mulitpath, make receiving terminal when separating signal, can occur a plurality of relevant peaks on time shaft, this is very big to the influence of time delay estimated accuracy.The purpose of NLOS inhibition method is to obtain the LOS footpath from many relevant peaks, its roughly thought be, the average of receiving terminal elder generation computer memory noise and local signal related operation is provided with the end thresholding of making an uproar again on this basis, makes a decision according to the location correlation peak that it is right that thresholding is made an uproar at the end then.

Concrete operation method: at first before signal arrives, the system acquisition noise signal, and noise signal and local reference signal carried out related calculation, write down the related operation result.Then, average is as the end average of making an uproar as a result with related operation, and to make the end thresholding L that makes an uproar be the 6dB of average of making an uproar at the end.At last, judge that correlation peak directly is the direct projection footpath of received signal greater than make an uproar article one relevant peaks of thresholding of the end.

By the method, suppress the NLOS interference effect in the complex environment of city.

Three, the location of mobile station coordinate resolves the stage:

The purpose that the location of mobile station coordinate resolves is by algebraically or method of geometry, obtains the location of mobile station coordinate, finishes the target location and estimates.

Fig. 6 is base station and the travelling carriage distribution diagrammatic sketch that participates in the location.The base station that participates in the location has four, one of them main positioning service station (as base station A), three auxilliary positioning service stations (as base station B, base station C, base station D).Main website (as base station A) is nearest with travelling carriage, and travelling carriage is received the signal strength signal intensity maximum that main website arrives, and the function of main website mainly contains: (1) determines the sector of travelling carriage; (2) determine to close on the prothetic group station location that participates in the location; (3) provide positional parameter.Extension station is made up of other three base stations (as base station B, base station C, base station D).The distance of extension station and travelling carriage is far away slightly, the signal strength signal intensity that travelling carriage is received extension station relatively a little less than, the function of extension station is to assist main website to send location reference signals and finish the location.

Shown in Figure 7 is the platform building block diagram of system, and system is according to LTE down physical channel FDD frame structure standard, sets up link; Collection/storage mode is selected by system, positions parameter extraction to received signal, and the transmission of system and reception all utilize an antenna port.

At the base station end, LTE system physical layer baseband processor is at first carried out initialization to each subframe: the scrambler sequence generator generates bit block to code word scrambling waiting for transmission, again the bit block symbol is carried out chnnel coding and interweaves.After initialization is finished, use QPSK to carry out the signal modulation, obtain the frequency domain complex valued signals; Then, complex valued signals is mapped to transport layer, transmission diversity used herein is a fdd mode; Pass through precoding processing again, with signal map to the vector block of antenna port; At last, carry out the mapping of RE resource, OFDM framing and digital to analog conversion operation, send signal to space channel.

LTE system bandwidth and resource block number are just like the corresponding relation of Fig. 9, and the selection of parameter that system of the present invention is selected as shown in figure 10.LTE selects the system bandwidth of 10MHz by the different different system bandwidths of number of sub carrier wave realization from 1.4MHz to 20MHz is set, and can guarantee that the time delay estimated accuracy is higher on the one hand, and the realizability of system design is stronger on the other hand.Parameter is as shown in figure 10 selected by system of the present invention, on the one hand with reference to the relevant regulations of LTE physical layer protocol for system design, on the other hand by such design, can solve delay parameter information fast.

Fig. 8 is the system handles flow chart.System docking is collected mail and number at first to be done 2 samplings, utilize the frequency domain method for fast searching again, the CP part of search location reference signals, then utilize the time domain searching method, the symbol original position of search location reference signals is utilized 0.618 method, the best relevant peaks position of search signal then, utilize NLOS inhibition method at last, determine LOS footpath signal.Like this, system obtains the delay parameter information of signal.With the delay parameter that extracts, give calculator, further estimate the target location.

As shown in Figure 2, system's demodulator demodulates r behind the time-domain signal, through Fourier transform, become frequency-region signal R, in frequency-domain correlator 202, to do frequency domain relevant with local signal, doing correlation peak in determining device 203 judges, and feedback information is given to data adjuster 204 (data adjuster 204 is mainly done the slip adjustment of local sliding window), do the sliding window conversion, judge to obtain peak-peak and note the peak value position, read the data in the memory 205, and be given to time domain correlator 206 and do time-domain related calculation, obtain the maximal correlation peak value and note delay positions, last signal suppresses the NLOS influence through NLOS inhibitor 207, and in calculator 208, calculate the target location.

As shown in Figure 3, frequency-domain correlator is mainly by memory (301), FFT module (302), local signal generator (303), related operation device group (304), peak value determining device (305), the slip associated window is adjusted (306) and is constituted, wherein after time-domain signal r process FFT (fast Fourier transform) module 302, obtain one group of frequency-region signal { R ₁, R ₂..., R _N; local signal generator 303 produces local frequency-region signal S according to the length of associated window; and through related operation device 304 (related operation device 1, related operation device 2 .... related operation device N) do the relevant accumulation of frequency domain computing; the correlation peak that obtains is judged in peak value determining device 305; and feeding back to slip associated window adjuster 306, the step-length of adjustment is N _CP,, note place delay positions as a result through memory 301 up to finding maximum correlated results.

As shown in Figure 4, the time domain correlator is mainly by memory (401), local signal generator (402), and related operation device group (403), peak value determining device (404), the slip associated window is adjusted (405) and is constituted.Wherein, time-domain signal r is according to the length of associated window, be divided into the N section, local signal generator 402 produces the time domain local signal, and at one group of related operation device 403 (related operation device 1, related operation device 2 .... related operation device N) in, carry out related calculation with signal, and in peak value determining device 404, judge correlation peak, judged result is fed back to slip associated window adjuster 405 adjust the slip associated window, obtain the maximal correlation peak value at last, note peak through memory 301.

As shown in Figure 5, concrete operation principle is: at first, the sampled data that receives is divided into two kinds, respectively corresponding two groups of sampled point x ₁And x ₂Then, with sampled point x ₁, x ₂Carry out related calculation with local time-domain signal s (t) respectively, obtain related operation peak1, peak2 as a result, moment corresponding is designated as t1, t2.Then, carrying out sampled point with 0.618 interpolation method upgrades.Method of operation: judge peak1, peak2, if peak1 〉=peak2, then x ₂To x ₁Direction moves 0.382 step-length, and upgrades x ₂Sampled point is designated as x3, if peak1＜peak2, then x ₁To x ₂Direction moves 0.382 step-length, and upgrades x ₁Sampled point is designated as x3; Sampled point x3 and local time-domain signal s (t) carry out related calculation, and obtain peak value peak3, and moment corresponding is designated as t3.At last, when time interval of two interpolation points

The time, stop computing; Otherwise, continue above-mentioned operation.The time of two interpolation points that so far, obtain is respectively t ' _C1And t ' _C2, the residing time of optimum sampling point can be used

Come approximate.

Claims (5)

1. LTE terminal wireless navigation system based on the fast delay time parameter search, it is characterized in that: comprise system's radio-frequency module (201), frequency-domain correlator (202), determining device (203), data adjuster (204), memory (205), time domain correlator (206), NLOS inhibitor (207), calculator (208) is after wherein system demodulates time-domain signal r, through Fourier transform, become frequency-region signal R, in frequency-domain correlator (202), to do frequency domain relevant with local signal, does correlation peak and judge in determining device (203), and feedback information is given to data adjuster (204), do the sliding window conversion, judge to obtain peak-peak and note the peak value position, read the data in the memory (205), and be given to time domain correlator (206) and do time-domain related calculation, obtain the maximal correlation peak value and note delay positions, last signal suppresses the NLOS influence through NLOS inhibitor (207), and in calculator (208), calculate the target location.

2. the LTE terminal wireless navigation system based on the fast delay time parameter search as claimed in claim 1, it is characterized in that: described frequency-domain correlator (202) is to utilize the symbol cyclic prefix (CP of LTE down link, Cycle Prefix) part, make that the each adjustment step-length of slip associated window is a CP length, and received signal and local signal are carried out related operation at frequency domain.

3. the LTE terminal wireless navigation system based on the fast delay time parameter search as claimed in claim 1, it is characterized in that: described time domain correlator (206) will be through the signal after the frequency domain correlation, transform to time domain, the each step-length of adjusting of slip associated window is 1 sampled point, and received signal and local signal are carried out related operation in time domain.

4. the LTE terminal wireless navigation system based on the fast delay time parameter search as claimed in claim 1, it is characterized in that: described calculator (208) is used 0.618 method, does the accurate estimation of delay parameter, with the twice sampled point x of received signal ₁, x ₂Carry out related calculation with local time-domain signal s (t) respectively, and bring in constant renewal in correlated results peak1, peak2, judge peak1, peak2, if peak1 〉=peak2, then x ₂To x ₁Direction moves 0.382 step-length, and upgrades x ₂Sampled point is designated as x3, if peak1＜peak2, then x ₁To x ₂Direction moves 0.382 step-length, and upgrades x ₁Sampled point is designated as x3; Sampled point x3 and local time-domain signal s (t) carry out related calculation, and obtain peak value peak3, and moment corresponding is designated as t3.

5. the LTE terminal wireless navigation system based on the fast delay time parameter search as claimed in claim 1, it is characterized in that: described NLOS inhibitor (207) method that noise gate is set, suppress the NLOS noise, the average of first acquisition noise and local signal correlated results:

$\left\{\begin{array}{c}\mathrm{aver}=\frac{1}{M}\underset{j=0}{\overset{M-1}{\mathrm{\&Sigma;}}}{d}_j^2\\ d_j^2=\underset{t=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{|s_w\left(t\right)\&times;n_j^{*}\left(t\right)|}^2,j=\mathrm{0,1},M-1\end{array}\right.$

Set up the end L that makes an uproar again, the end of making an uproar, with the pass of the relevant average of noise be:

$6\mathrm{dB}=10{\log }_{10}\frac{L}{\mathrm{aver}}$

At last, think that peak value directly is the LOS footpath of signal greater than article one relevant peaks of L, remaining is the NLOS footpath.

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