CN105116374B - The measurement of phase delay and scaling method and signal processor, RSU - Google Patents
The measurement of phase delay and scaling method and signal processor, RSU Download PDFInfo
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- CN105116374B CN105116374B CN201510395181.7A CN201510395181A CN105116374B CN 105116374 B CN105116374 B CN 105116374B CN 201510395181 A CN201510395181 A CN 201510395181A CN 105116374 B CN105116374 B CN 105116374B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0205—Details
- G01S5/021—Calibration, monitoring or correction
Abstract
The invention provides a kind of measurement of phase delay and scaling method and signal processor, RSU, methods described includes：The microwave signal of the N number of passage to receiving carries out computing cross-correlation, obtains covariance matrix Rxx；According to the covariance matrix RxxObtain the phase delay between any two passage；According to the phase delay between passage two-by-two, the phase delay cumulative errors function of each passage is obtained；Phase delay cumulative errors function according to each passage, determines that the minimum passage of phase delay cumulative errors function is optimal channel；With the optimal channel as reference, the optimum angle for demarcating N number of passage postpones.The present invention can obtain more accurate and stabilization passage relative phase delay.
Description
Technical field
The present invention relates to field of intelligent control, and in particular to a kind of measurement of phase delay and scaling method and signal transacting
Device, RSU.
Background technology
In ETC (Electronic Toll Collection, electric non-stop toll) system, based on space array day
The RSU (Road Side Unit, roadside unit) of line using DOA (Direction of Arrival, Mutual coupling) and
DBF (Digital Beam Forming, digital beam froming) technologies are determined OBU (On board Unit, board units)
Position and directional beam are formed, and due to the intrinsic difference of hardware such as circuit is asymmetric, device performance is inconsistent, cause signal in each passage
Relative phase delay (referred to as channel delay) can be produced during transmission, to eliminate the relative phase delay between passage, it is necessary to obtain
Accurate channel delay parameter is taken so that each receiving channel to RSU carries out phase delay compensation, to ensure the accuracy of positioning
And stability.As shown in Figure 1.
In Fig. 1, OBU (5) launches microwave signal to RSU, and RSU passes through array antenna (being made up of antenna element 101~103)
Microwave signal is received, each receiving channel (201~203) carries out the signal transactings such as down coversion, filtering, amplification respectively will be received
Microwave signal is changed into intermediate-freuqncy signal, and analog signal is changed into data signal, at signal by intermediate-freuqncy signal by synchronization AD collections (3)
Reason unit carries out special algorithm treatment to AD data signals.
In the test and calibration process of channel delay, signal processing unit is analyzed to the signal of each passage,
Calculate the communication channel delay between receiving channel, and by channel delay parameter preserve in memory to position when mended
Repay.In OBU position fixing process, RSU receives the microwave signal of OBU transmittings, channel delay parameter is read from memory and is docked
The signal for receiving carries out delay compensation, then OBU is accurately positioned by DOA scheduling algorithms, the result such as output positioning.
The content of the invention
For defect of the prior art, the present invention provides measurement and scaling method and the signal transacting of a kind of phase delay
Device, RSU, can obtain more accurate and stabilization passage relative phase delay.
In order to solve the above technical problems, the present invention provides following technical scheme：
In a first aspect, measurement and scaling method the invention provides a kind of phase delay, including：
The microwave signal of the N number of passage to receiving carries out computing cross-correlation, obtains covariance matrix Rxx；
According to the covariance matrix RxxObtain the phase delay between any two passage；
According to the phase delay between passage two-by-two, the phase delay cumulative errors function of each passage is obtained；
Phase delay cumulative errors function according to each passage, determines the minimum passage of phase delay cumulative errors function
It is optimal channel；
With the optimal channel as reference, the optimum angle for demarcating N number of passage postpones.
Further, the microwave signal of the N number of passage to receiving carries out computing cross-correlation, obtains covariance matrix RxxBag
Include：
Microwave signal to N number of passage carries out computing cross-correlation, obtains covariance matrix Rxx：
Rxx=XXH；
Wherein, XHIt is the conjugate transposition of X, X=[X1,X2,...,XN]ΤIt is the microwave signal of N number of passage for receiving；Appoint
The microwave signal X of meaning passage nnFor：
Wherein, AnIt is the amplitude of the n-th channel signal, e is natural constant, and i is imaginary unit, and w is the angular frequency of signal, t
It is the time,It is the phase of the n-th channel signal, N is number of active lanes, N >=3.
Further, according to the covariance matrix RxxThe phase delay obtained between any two passage includes：
According to covariance matrix RxxThe phase delay between any two passage is obtained, channel phases delay matrix is obtained：
Wherein, the phase delay of passage m and passage nFor
Further, according to the phase delay between passage two-by-two, the phase delay cumulative errors letter of each passage is obtained
Number includes：
The phase delay cumulative errors function between passage m and n is obtained according to the phase delay between passage two-by-two
Wherein, m, k=1,2 ..., N, N >=3；
According to the phase delay cumulative errors functionObtain phase delay cumulative errors matrix
According to the phase delay cumulative errors matrixObtain the phase delay cumulative errors function of any passage n
Wherein, n=1,2 ..., N, N >=3；
The phase delay cumulative errors function of the passage nRepresent that passage n tires out to the phase delay of remaining all passage
Meter error.
Further, with the optimal channel as reference, the optimum angle for demarcating N number of passage postpones to include：
With optimal channel l as reference, according toThe optimum angle for demarcating N number of passage postpones.
Further, after the optimum angle for demarcating N number of passage postpones, methods described also includes：
Postponed using optimum angleThe microwave signal that each passage n is received is carried out accordingly
Phase delay compensation：
Second aspect, it is single present invention also offers a kind of signal processor, including acquiring unit, determining unit and demarcation
Unit；
The acquiring unit, the microwave signal for the N number of passage to receiving carries out computing cross-correlation, obtains covariance
Matrix Rxx；
The acquiring unit, is additionally operable to according to the covariance matrix RxxThe phase obtained between any two passage is prolonged
Late；
The acquiring unit, is additionally operable to, according to the phase delay between passage two-by-two, obtain the phase delay of each passage
Cumulative errors function；
The determining unit, the phase delay cumulative errors letter of each passage for being obtained according to the acquiring unit
Number, determines that the minimum passage of phase delay cumulative errors function is optimal channel；
The demarcation unit, for the optimal channel that determines with the determining unit as reference, demarcates the optimal of N number of passage
Phase delay.
Further, the acquiring unit, computing cross-correlation is carried out for the microwave signal to N number of passage, obtains association side
Difference matrix Rxx：
Rxx=XXH；
Wherein, XHIt is the conjugate transposition of X, X=[X1,X2,...,XN]ΤIt is the microwave signal of N number of passage for receiving；Appoint
The microwave signal X of meaning passage nnFor：
Wherein, AnIt is the amplitude of the n-th channel signal, e is natural constant, and i is imaginary unit, and w is the angular frequency of signal, t
It is the time,It is the phase of the n-th channel signal, N is number of active lanes, N >=3.
Further, the acquiring unit is additionally operable to according to covariance matrix RxxObtain the phase between any two passage
Time delay, obtains channel phases delay matrix：
Wherein, the phase delay of passage m and passage nFor
The third aspect, present invention also offers a kind of RSU, including：Array antenna, receiving channel, AD collectors and storage
Device, also including signal processor recited above；
The array antenna is used to receive the microwave signal of N number of passage；
The receiving channel is used to carry out down coversion to the microwave signal, so that it becomes intermediate-freuqncy signal；
The AD collectors, for the intermediate-freuqncy signal to be changed into data signal；
The signal processor, the optimum angle of the N number of passage of signal scaling for being exported according to AD samplers postpones；
The memory, the optimum angle of each passages of N for the signal processor to be demarcated postpones to be stored.
As shown from the above technical solution, phase delay scaling method of the present invention, the microwave for being received to RSU first
Signal carries out computing cross-correlation and draws signal covariance matrix, and next is calculated between any two passage according to covariance matrix
Communication channel delay, then determines most stable of receiving channel (optimal channel) in RSU, finally according to the relativity between communication channel delay
The communication channel delay of remaining all passage is demarcated as reference channel with optimal channel, so as to ensure that RSU receiving channel relative phases
The Stability and veracity of time delay, improves positioning precisions and directional beam Forming ability of the RSU to OBU equipment.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is that signal receives schematic diagram；
Fig. 2 is the flow chart of the measurement and scaling method of the phase delay that the embodiment of the present invention one is provided；
Fig. 3 is the structural representation of the signal processor that the embodiment of the present invention two is provided；
Fig. 4 is the structural representation based on array antenna RSU phase delay calibration systems.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, clear, complete description is carried out to the technical scheme in the embodiment of the present invention, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
The present invention proposes measurement and the scaling method of a kind of phase delay, the microwave letter that the method is received to RSU first
Number carrying out computing cross-correlation draws signal covariance matrix, secondly according to covariance matrix calculate any two passage between lead to
Road time delay, then determines most stable of receiving channel (optimal channel) in RSU according to the relativity between communication channel delay, finally with
Optimal channel demarcates the communication channel delay of remaining all passage for reference channel, so as to ensure that RSU receiving channel relative phases prolong
When Stability and veracity, improve positioning precisions and directional beam Forming ability of the RSU to OBU equipment.
Fig. 2 shows the flow chart of the measurement and scaling method of the phase delay described in the embodiment of the present invention one.Referring to figure
2, comprise the following steps：
Step 101：The microwave signal of the N number of passage to receiving carries out computing cross-correlation, obtains covariance matrix Rxx。
In this step, the microwave signal to N number of passage carries out computing cross-correlation, obtains covariance matrix Rxx：
Rxx=XXH；
Wherein, XHIt is the conjugate transposition of X, X=[X1,X2,...,XN]ΤIt is the microwave signal of N number of passage for receiving；Appoint
The microwave signal X of meaning passage nnFor：
Wherein, AnIt is the amplitude of the n-th channel signal, e is natural constant, and i is imaginary unit, and w is the angular frequency of signal, t
It is the time,It is the phase of the n-th channel signal, N is number of active lanes, N >=3.
Step 102：According to the covariance matrix RxxObtain the phase delay between any two passage.
In this step, according to covariance matrix RxxThe phase delay between any two passage is obtained, passage phase is obtained
Position delay matrix：
Wherein, the phase delay of passage m and passage nFor
Step 103：According to the phase delay between passage two-by-two, the phase delay cumulative errors letter of each passage is obtained
Number.
In this step, it can be seen from the phase delay relativeness between passage, have for any passage m and passage n
Due to influences such as in itself receiving channel unstability, circuit thermal noise, device aging (or damage), external disturbances
The factor of signal stabilization, causes the communication channel delay between passage to there is randomized jitter.Therefore, communication channel delay can be divided into inherently
Time delayWith random phase delay time errorComposition, the communication channel delay of passage m and passage n is expressed as：
It is theoretical proper phase time delay,It is random phase delay time error, it is good with two performances of passage
The characteristics such as bad, device stability are related.
Proper phase time delay between passage has following relation:
Wherein m, k, n are unequal, define random error function
Abbreviation, obtains：
Define deviation accumulation functionThe phase delay cumulative errors between m and the passages of n two are represented with this：
By deviation accumulation function, phase delay cumulative errors matrix is obtained
According to the phase delay cumulative errors matrixObtain the phase delay cumulative errors function of any passage n
Wherein, n=1,2 ..., N, N >=3；
Then communication channel delay cumulative errors matrix can be reduced to vector：
Wherein vector in each valuePhase delay cumulative errors of the n-channel relative to remaining all passage are represented,
According to optimal channel criterion in following step 104, determine that the minimum passage of phase delay entirety cumulative errors function is most
Excellent passage：
It is with reference to the i.e. optimal channel time delay of this group of communication channel delay demarcated with optimal channel n after determining optimal channel n.
Step 104：Phase delay cumulative errors function according to each passage, determines phase delay cumulative errors function most
Small passage is optimal channel.
In this step, it is assumed that the phase delay cumulative errors function of N number of passage is respectively
So choose error functionMinimum passage n is used as optimal channel.For example, the error function of passage lIt is minimum, then
Optimal channel is l.
In this step, error functionMinimum means that the receptivity of passage is most stable, therefore chooses error functionMinimum passage means to choose most stable of receiving channel (optimal channel) in RSU.
Step 105：With the optimal channel as reference, the optimum angle for demarcating N number of passage postpones.
In this step, with optimal channel l as reference, according toDemarcate the optimal of N number of passage
Phase delay.
For example, for the 1st passage, optimum angle delay isFor the 2nd passage, optimal phase
Position postponesFor other passages, can with the like.
To eliminate the relative phase delay between each passage, it is necessary to obtain accurate channel delay parameter so as to RSU's
Each receiving channel carries out phase delay compensation, to ensure the Stability and veracity of positioning.Phase delay described in the present embodiment
Scaling method, the microwave signal for being received to RSU first carries out computing cross-correlation and draws signal covariance matrix, secondly according to association
Variance matrix calculates communication channel delay between any two passage, in then determining RSU according to the relativity between communication channel delay
Most stable of receiving channel (optimal channel), is finally prolonged with the passage that optimal channel demarcates remaining all passage as reference channel
When, so as to ensure that the Stability and veracity of RSU receiving channel relative phase time delays, improve positioning of the RSU to OBU equipment
Precision and directional beam Forming ability.
In other embodiments of the present invention, methods described also includes step 106：
Step 105：Postponed using optimum angleThe microwave signal received to each passage n
Carry out corresponding phase delay compensation：
After being compensated to RSU communication channel delay, OBU can be positioned by DOA and DBF technologies and directional beam shape
Into.
The phase for being provided the present invention as a example by demarcating 4 communication channel delay of the RSU equipment of antenna element (4 passage) below
The measurement of delay and scaling method are explained.
Step S1：Microwave rf generator is placed into RSU fronts transmitting microwave signal, RSU receives the microwave letter of all passages
Number；
Computing cross-correlation is carried out to above-mentioned microwave signal, signal X is tried to achievenCovariance matrix Rxx:
Rxx={ X1,X2,X3,X4}·{X1,X2,X3,X4}H；
Step S2：According to covariance matrix Rxx, seek the communication channel delay between any two passage.
Step S2：According to cumulative errors function, phase delay cumulative errors matrix is tried to achieve.
The overall cumulative errors of all passages are obtained according to global error aggregation function
ThenIt is represented by following vector：
Step S4：According to passage optiaml ciriterion：
The minimum passage l of selection delay time error function, and determine to prolong with the passage that this passage is reference
WhenAs compensation communication channel delay.
Step 5. is by optimal channel time delayDemarcate into RSU memories, as preset parameter
All passages are carried out with corresponding phase delay compensation.
Can realize that the positioning and directional beam of OBU incoming signals are formed by special algorithm in DOA and DBF afterwards.
The following is the data of actual 4 passages, wherein known 4 channel performance is most stable, as optimal channel, below with this
Invention methods described is verified to it.
Step 1：Signal covariance matrix Rxx。
Step 2：According to covariance matrix Rxx, try to achieve communication channel delay matrix
Step 3：Try to achieve phase delay errors matrix
Step 4：Try to achieve the overall phase delay errors of each passage.
According to optimal channel criterion, phase delay entirety cumulative errors are minimum to be optimal channel, can be obtained most by upper data
Excellent passage is 4 passages, and physical device state consistency, hence it is demonstrated that the method for determining optimal channel of the present invention have compared with
Accuracy and practicality high.
Fig. 3 shows the structural representation of the signal processor that the embodiment of the present invention two is provided, and referring to Fig. 3, the present invention is real
Apply example two offer signal processor, including acquiring unit 21, determine Unit 22 and demarcate unit 23；
The acquiring unit 21, the microwave signal for the N number of passage to receiving carries out computing cross-correlation, obtains association side
Difference matrix Rxx；
The acquiring unit 21, is additionally operable to according to the covariance matrix RxxThe phase obtained between any two passage is prolonged
Late；
The acquiring unit 21, is additionally operable to according to the phase delay between passage two-by-two, and the phase for obtaining each passage is prolonged
When cumulative errors function；
The determining unit 22, the phase delay cumulative errors letter of each passage for being obtained according to the acquiring unit
Number, determines that the minimum passage of phase delay cumulative errors function is optimal channel；
The demarcation unit 23, for the optimal channel that is determined with the determining unit as reference, the N number of passage of demarcation is most
Excellent phase delay.
Preferably, the acquiring unit 21, computing cross-correlation is carried out for the microwave signal to N number of passage, obtains association side
Difference matrix Rxx：
Rxx=XXH；
Wherein, XHIt is the conjugate transposition of X, X=[X1,X2,...,XN]ΤIt is the microwave signal of N number of passage for receiving；Appoint
The microwave signal X of meaning passage nnFor：
Wherein, AnIt is the amplitude of the n-th channel signal, e is natural constant, and i is imaginary unit, and w is the angular frequency of signal, t
It is the time,It is the phase of the n-th channel signal, N is number of active lanes, N >=3.
Preferably, the acquiring unit 21 is additionally operable to according to covariance matrix RxxObtain the phase between any two passage
Time delay, obtains channel phases delay matrix：
Wherein, the phase delay of passage m and passage nFor
Preferably, the acquiring unit 21 is additionally operable to be obtained between passage m and n according to the phase delay between passage two-by-two
Phase delay cumulative errors function
Wherein, m, k=1,2 ..., N, N >=3；
According to the phase delay cumulative errors functionObtain phase delay cumulative errors matrix
According to the phase delay cumulative errors matrixObtain the phase delay cumulative errors function of any passage n
Wherein, n=1,2 ..., N, N >=3；
The phase delay cumulative errors function of the passage nRepresent that passage n tires out to the phase delay of remaining all passage
Meter error.
Preferably, the demarcation unit 23 is used for optimal channel l as reference, according toDemarcate
The optimum angle of N number of passage postpones.
In other embodiments of the invention, the signal processor also includes delay compensation unit.
The delay compensation unit, for being postponed using optimum angleEach passage n is connect
The microwave signal for receiving carries out corresponding phase delay compensation：
Signal processor described in the present embodiment can be used for performing the method described in above-described embodiment, its principle and effect
It is similar, no longer describe in detail herein.
The embodiment of the present invention three provides a kind of RSU, including：Array antenna, receiving channel, AD collectors and memory,
Also include the signal processor described in above-described embodiment two；
The array antenna is used to receive the microwave signal of N number of passage；
The receiving channel is used to carry out down coversion to the microwave signal, so that it becomes intermediate-freuqncy signal；
The AD collectors, for the intermediate-freuqncy signal to be changed into data signal；
The signal processor, the optimum angle of the N number of passage of signal scaling for being exported according to AD samplers postpones；
The memory, the optimum angle of the N number of passage for the signal processor to be demarcated postpones to be stored.
Memory generally uses RAM and ROM.Wherein, RAM (Random Access Memory, random access memory)
Operation and some temporary variables for program are stored.
Wherein, ROM (Read Only Memory, read-only storage) storage system relevant configurations and initiation parameter are believed
Breath.
Wherein, the signal processor is additionally operable to postpone using the optimum angle of the N number of passage demarcatedCorresponding phase delay compensation is carried out to the microwave signal that each passage n is received：
In addition, being generally comprised based on array antenna RSU phase delay calibration systems：Microwave signal calibration facility (send out by signal
Penetrate source), containing at least three the RSU equipment based on array antenna of (or multiple) passages (RSU as described in the present embodiment three sets
It is standby), as shown in Figure 4.
Microwave signal calibration facility is used for the measurement of RSU communication channel delay, and microwave signal, signal scaling equipment are launched to RSU
Need to be placed at RSU fronts so that signal arrival bearing is vertical with array antenna surface.
Above example is merely to illustrate technical scheme, rather than its limitations；Although with reference to the foregoing embodiments
The present invention has been described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent to which part technical characteristic；And these are changed or replace
Change, do not make the spirit and scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.
Claims (7)
1. a kind of measurement of phase delay and scaling method, it is characterised in that including：
The microwave signal of the N number of passage to receiving carries out computing cross-correlation, obtains covariance matrix Rxx；
According to the covariance matrix RxxObtain the phase delay between any two passage；
According to the phase delay between passage two-by-two, the phase delay cumulative errors function of each passage is obtained；
Phase delay cumulative errors function according to each passage, determines the minimum passage of phase delay cumulative errors function for most
Excellent passage；
With the optimal channel as reference, the optimum angle for demarcating N number of passage postpones；
Wherein, according to the covariance matrix RxxThe phase delay obtained between any two passage includes：
According to covariance matrix RxxThe phase delay between any two passage is obtained, channel phases delay matrix is obtained：
Wherein, the phase delay of passage m and passage nFor
Wherein, according to the phase delay between passage two-by-two, the phase delay cumulative errors function for obtaining each passage includes：
The phase delay cumulative errors function between passage m and n is obtained according to the phase delay between passage two-by-two
Wherein, m, k=1,2 ..., N, N >=3；
According to the phase delay cumulative errors functionObtain phase delay cumulative errors matrix
According to the phase delay cumulative errors matrixObtain the phase delay cumulative errors function of any passage n
Wherein, n=1,2 ..., N, N >=3；
The phase delay cumulative errors function of the passage nRepresent that passage n adds up to miss to the phase delay of remaining all passage
Difference.
2. method according to claim 1, it is characterised in that the microwave signal of the N number of passage to receiving is carried out mutually
Computing is closed, covariance matrix R is obtainedxxIncluding：
Microwave signal to N number of passage carries out computing cross-correlation, obtains covariance matrix Rxx：
Rxx=XXH；
Wherein, XHIt is the conjugate transposition of X, X=[X1,X2,...,XN]TIt is the microwave signal of N number of passage for receiving；Any passage
The microwave signal X of nnFor：
Wherein, AnIt is the amplitude of the n-th channel signal, e is natural constant, and i is imaginary unit, and w is the angular frequency of signal, when t is
Between,It is the phase of the n-th channel signal, N is number of active lanes, N >=3.
3. method according to claim 1, it is characterised in that with the optimal channel as reference, demarcates N number of passage most
Excellent phase delay includes：
With optimal channel l as reference, according toThe optimum angle for demarcating N number of passage postpones.
4. method according to claim 3, it is characterised in that described after the optimum angle for demarcating N number of passage postpones
Method also includes：
Postponed using optimum angleCorresponding phase is carried out to the microwave signal that each passage n is received
Position compensation of delay：
5. a kind of signal processor, it is characterised in that including acquiring unit, determining unit and demarcate unit；
The acquiring unit, the microwave signal for the N number of passage to receiving carries out computing cross-correlation, obtains covariance matrix
Rxx；
The acquiring unit, is additionally operable to according to the covariance matrix RxxObtain the phase delay between any two passage；
The acquiring unit, the phase delay for being additionally operable to be obtained according to the phase delay between passage two-by-two each passage adds up
Error function；
The determining unit, the phase delay cumulative errors function of each passage for being obtained according to the acquiring unit, really
The minimum passage of phase bit time delay cumulative errors function is optimal channel；
The demarcation unit, for the optimal channel that determines with the determining unit as reference, demarcates the optimum angle of N number of passage
Postpone；
The acquiring unit is additionally operable to according to covariance matrix RxxThe phase delay between any two passage is obtained, passage is obtained
Phase delay matrix：
Wherein, the phase delay of passage m and passage nFor
The acquiring unit is additionally operable to be obtained according to the phase delay between passage two-by-two the accumulative mistake of phase delay of each passage
Difference function：
The phase delay cumulative errors function between passage m and n is obtained according to the phase delay between passage two-by-two
Wherein, m, k=1,2 ..., N, N >=3；
According to the phase delay cumulative errors functionObtain phase delay cumulative errors matrix
According to the phase delay cumulative errors matrixObtain the phase delay cumulative errors function of any passage n
Wherein, n=1,2 ..., N, N >=3；
The phase delay cumulative errors function of the passage nRepresent that passage n adds up to miss to the phase delay of remaining all passage
Difference.
6. signal processor according to claim 5, it is characterised in that the acquiring unit, for the micro- of N number of passage
Ripple signal carries out computing cross-correlation, obtains covariance matrix Rxx：
Rxx=XXH；
Wherein, XHIt is the conjugate transposition of X, X=[X1,X2,...,XN]TIt is the microwave signal of N number of passage for receiving；Any passage
The microwave signal X of nnFor：
Wherein, AnIt is the amplitude of the n-th channel signal, e is natural constant, and i is imaginary unit, and w is the angular frequency of signal, when t is
Between,It is the phase of the n-th channel signal, N is number of active lanes, N >=3.
7. a kind of RSU, including：Array antenna, receiving channel, AD collectors and memory, it is characterised in that also including such as right
It is required that the signal processor described in 5；
The array antenna is used to receive the microwave signal of N number of passage；
The receiving channel is used to carry out down coversion to the microwave signal, so that it becomes intermediate-freuqncy signal；
The AD collectors, for the intermediate-freuqncy signal to be changed into data signal；
The signal processor, the optimum angle of the N number of passage of signal scaling for being exported according to AD samplers postpones；
The memory, the optimum angle of each passages of N for the signal processor to be demarcated postpones to be stored.
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