CN104867196B - A kind of method, signal processing apparatus and the roadside unit that prevent label signal from colliding - Google Patents
A kind of method, signal processing apparatus and the roadside unit that prevent label signal from colliding Download PDFInfo
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- CN104867196B CN104867196B CN201510345254.1A CN201510345254A CN104867196B CN 104867196 B CN104867196 B CN 104867196B CN 201510345254 A CN201510345254 A CN 201510345254A CN 104867196 B CN104867196 B CN 104867196B
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
- G07B15/00—Arrangements or apparatus for collecting fares, tolls or entrance fees at one or more control points
- G07B15/06—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10029—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
Abstract
A kind of method, signal processing apparatus and the roadside unit that prevent label signal from colliding, interfered for solving multiple OBU to be present and send caused by microwave signal so that target OBU is not disturbed by other OBU.Present invention method includes：The microwave signal that multiple OBU send is received by phased-array antenna array, obtains multiple microwave signals；The azimuth information of each OBU in multiple OBU is determined according to multiple microwave signals；According to azimuth information, multiple OBU microwave signal is handled using airspace filter, make it that in addition to target OBU microwave signal, the microwave signal of the OBU on other locus is cancelled, target OBU is current transaction OBU.
Description
Technical field
The present invention relates to intelligent transportation (Intelligent Transportation System, ITS) field, especially relate to
A kind of and signal processing method and its device for preventing multi-tag signal collision.
Background technology
In ITS fields, typically all by DSRC technology (Dedicated Short Range
Communication, DSRC) it is applied in electric non-stop toll (Electronic Toll Collection, ETC) system
Roadside unit function class product in, with the extensive use and fast development of intelligent transport technology, the group that China uses at present
Box-like electric non-stop toll mode, the passage rate of vehicle is still unhappy, and the area of ETC tracks occupancy road is larger.
Existing multilane free flow toll collection technique, it is a kind of quick ETC technologies for being not provided with any charge roadblock, by
It is not provided with isolating between multilane so that vehicle pass-through speed further improves, while also reduces track infrastructure
Cost and the area for taking road.
But in the free streaming system of multilane, it is inevitably present the electronic tag of at least more than one while locates
In the situation of the sphere of action of DSRC read write lines, easily cause tag-collision phenomenon, tag-collision phenomenon is when multiple electronics marks
Label are in the read-write region of read write line simultaneously when, data collision will occur for the data that these electronic tags send read write line to,
There is the situation that signal interferes, so as to cause the communication failure between card reader and label.Card reader and electronic tag it
Between communication failure, have impact on the normal operation of whole system.
The content of the invention
A kind of method, signal processing apparatus and the roadside unit that prevent label signal from colliding, for solving multiple OBU be present
Send and interfered caused by microwave signal so that target OBU is not disturbed by other OBU.
First aspect present invention provides a kind of method for preventing label signal from colliding, applied to including phased-array antenna array
Roadside unit, including：
The microwave signal sent by the multiple board units OBU of phased-array antenna array reception, obtains multiple microwaves
Signal；
The azimuth information of each OBU in the multiple OBU is determined according to the multiple microwave signal；
According to the azimuth information, the multiple OBU microwave signal is handled using airspace filter, to remove
Outside target OBU microwave signal, the microwave signal of the OBU on other locus is cancelled, and the target OBU is current transaction
OBU。
It is described according to the azimuth information in first aspect present invention first embodiment with reference to first aspect present invention,
Carrying out processing to the multiple OBU microwave signal using airspace filter includes：
According to the azimuth information, the multiple OBU microwave signal is carried out based on minimum mean square error criterion MMSE
Weighing vector processing.
It is described to be based in first aspect present invention second embodiment with reference to first aspect present invention first embodiment
Minimum mean square error criterion MMSE is weighted Vector Processing to the multiple OBU microwave signal to be included：
The microwave signal of the target OBU is selected as training sequence；
The best weight value of airspace filter is calculated using least-mean-square error algorithm LMS；
Vector Processing is weighted to the multiple microwave signal according to best weight value.
It is described selected in the embodiment of first aspect present invention the 3rd with reference to first aspect present invention second embodiment
The microwave signal of the target OBU includes as training sequence：
The preamble signal that the selected target OBU is sent, using the preamble signal that the target OBU is sent as training
Sequence.
With reference to the embodiment of first aspect present invention the 3rd, in the embodiment of first aspect present invention the 4th, the basis
The multiple microwave signal determines that the azimuth information of each OBU in the multiple OBU includes：
The multiple microwave signal is synchronously mixed and filtering process, obtains multiple intermediate-freuqncy signals；
A/D acquisition process is carried out to the multiple intermediate-freuqncy signal, obtains multiple data signals；
Down-converted is carried out to the multiple data signal, obtains multiple baseband signals；
Calculated, obtained the multiple using Multiple Signal Classification MUSIC wireless location algorithms according to the multiple baseband signal
Each OBU azimuth information in OBU.
It is described phased in the embodiment of first aspect present invention the 5th with reference to the embodiment of first aspect present invention the 4th
Array antenna array includes 2 bays, and the azimuth information includes deflection and the angle of pitch,
It is described according to the azimuth information, carrying out processing to the multiple OBU microwave signal using airspace filter includes：
The microwave signal of target OBU in the multiple OBU microwave signal is that the azimuth information of the target OBU is
Direction angle alpha and angle of pitch β, it is r=s to define steering vector corresponding to the microwave signal of the target OBU0' * a, wherein a=
Exp (- j*2* π * [0 1] * cos (α) * sin (β)), the numberings of two bays are 0 and 1, the target OBU received
Microwave signal vector be r=[r0 r1]T, the output of airspace filter is Y0=W0r0、Y1=W1r1、W0=[W0,0,W0,1] and W1=
[W1,0,W1,1], obtain after airspace filter corresponding to bay 0 weighted vector W0Sweared with the weights of corresponding bay 1
Measure W1, the error variance of airspace filter output is e0=y0-h0s0=W0r-r0,d, e1=y1-h1s0=W1r-r1,d, r0,dAnd r1,dFor
The microwave signal for the target OBU that bay 0 and bay 1 are respectively received, the error vector form of airspace filter
For e [n]=Wr [n]-rd[n], wherein e [n]=[e0,e1]T, W [n]=[w0,w1]T, r [n]=[r0,d,r1,d]T, using based on
The LMS algorithm of MMSE criterions passes through formula u=W ' * r [n] and W=W-r [n] * (u-s0[n]) best weight value is obtained, according to described
Best weight value is weighted Vector Processing to the multiple microwave signal, to cause in addition to the microwave signal of the target OBU, its
The microwave signal of OBU on his locus is cancelled, and the target OBU is current transaction OBU.
Second aspect of the present invention provides a kind of signal processing apparatus, applied to the trackside list comprising phased-array antenna array
Member, including：
Receiving unit, for receiving the multiple board units OBU microwave signal sent, obtain multiple microwave signals；
Computing unit, for determining that the orientation of each OBU in the multiple OBU is believed according to the multiple microwave signal
Breath；
Processing unit, for according to the azimuth information, being carried out using airspace filter to the multiple OBU microwave signal
Processing, make it that in addition to target OBU microwave signal, the microwave signal of the OBU on other locus is cancelled, the target
OBU is current transaction OBU.
With reference to second aspect of the present invention, in second aspect of the present invention first embodiment,
The processing unit, specifically for according to the azimuth information, based on minimum mean square error criterion MMSE to described
Multiple OBU microwave signal is weighted Vector Processing.
Third aspect present invention provides a kind of roadside unit, including phased-array antenna array and signal transacting as described above
Device.
With reference to third aspect present invention, in third aspect present invention first embodiment, the phased-array antenna array is
The micro-strip antenna array being made up of a plurality of submatrixs, and the circular polarized antenna linear array system realized by double-fed point orthogonal manner.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
In the embodiment of the present invention, the multiple OBU multiple microwave signals sent are received by phased-array antenna array, according to
Multiple microwave signals determine the azimuth information of each OBU in multiple OBU, according to azimuth information, using airspace filter to multiple
OBU microwave signal is handled, to cause in addition to target OBU microwave signal, the microwave letter of the OBU on other locus
Number it is cancelled, target OBU is current transaction OBU, in the case where multiple OBU be present, after the azimuth information for determining each OBU, is led to
Airspace filter is crossed to handle multiple OBU microwave signal so that in addition to target OBU microwave signal, other locus
On OBU microwave signal be cancelled, therefore, interference of other OBU to target OBU can be reduced.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to institute in embodiment and description of the prior art
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of embodiment schematic diagram for the method for preventing tag-collision in the embodiment of the present invention；
Fig. 2 is the schematic diagram that OBU azimuth informations are calculated in the embodiment of the present invention；
Fig. 3 is a kind of embodiment schematic diagram of signal processing apparatus in the embodiment of the present invention；
Fig. 4 is a kind of embodiment schematic diagram of roadside unit in the embodiment of the present invention.
Embodiment
A kind of method, signal processing apparatus and the roadside unit that prevent label signal from colliding, for solving multiple OBU be present
Send and interfered caused by microwave signal so that target OBU is not disturbed by other OBU.
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, it should all belong to the model that the present invention protects
Enclose.
The present invention is described in further detail below by embodiment combination accompanying drawing.
The embodiment of the present invention is applied in the roadside unit function class product in ETC system, is also applied for other application road
In the system of side unit.
Referring to Fig. 1, the embodiment of the present invention provides a kind of microwave signal process method for preventing multi-tag from colliding, including：
101st, the microwave signal that multiple OBU send is received by phased-array antenna array, obtains multiple microwave signals；
In the embodiment of the present invention, signal processing apparatus receives the microwave that multiple OBU send by phased-array antenna array
Signal, obtain multiple microwave signals.
102nd, the azimuth information of each OBU in multiple OBU is determined according to multiple microwave signals；
In the embodiment of the present invention, calculated according to obtained multiple microwave signals, determine each OBU in multiple OBU
Azimuth information.
103rd, according to azimuth information, multiple OBU microwave signal is handled using airspace filter.
In the embodiment of the present invention, according to the azimuth information of determination, multiple OBU microwave signal is carried out using airspace filter
Processing, make it that in addition to target OBU microwave signal, the microwave signal of the OBU on other locus is cancelled, target OBU
For current transaction OBU, the wherein OBU on other locus microwave signal be cancelled can be completely counterbalanced by or
Partial offset, the part in the OBU on his locus can also not be offset.
In the embodiment of the present invention, signal processing apparatus receives the multiple OBU microwave sent by phased-array antenna array
Signal, the azimuth information of each OBU in multiple OBU is determined according to obtained multiple microwave signals, according to azimuth information, used
Airspace filter is handled multiple OBU microwave signal, to cause in addition to target OBU microwave signal, other locus
On OBU microwave signal be cancelled, target OBU is current transaction OBU, in the case where multiple OBU be present, determines each OBU
Azimuth information after, multiple OBU microwave signal is handled by airspace filter so that except target OBU microwave signal
Outside, the microwave signal of the OBU on other locus is cancelled, and therefore, can reduce interference of other OBU to target OBU.
Optionally, in some embodiments of the present invention, according to directional information, the microwave using airspace filter to multiple OBU
Signal, which carries out processing, to be included：
According to directional information, vector is weighted to multiple OBU microwave signal based on minimum mean square error criterion MMSE
Processing.
Optionally, in the embodiment of the present invention, multiple OBU microwave signal is carried out based on minimum mean square error criterion MMSE
Weighing vector processing includes：
Selected target OBU microwave signal is as training sequence；
The best weight value of airspace filter is calculated using least-mean-square error algorithm LMS；
Vector Processing is weighted to multiple intermediate-freuqncy signals according to best weight value.
Optionally, in some embodiments of the present invention, selected target OBU microwave signal includes as training sequence：
The preamble signal that target OBU is sent is received, the preamble signal that target OBU is sent is as training sequence.
In the embodiment of the present invention, the refinement for the step of being handled using airspace filter multiple OBU microwave signal, make
The scheme of obtaining is more perfect.
Optionally, in some embodiments of the present invention, each OBU in multiple OBU is determined according to multiple microwave signals
Azimuth information includes：
Multiple microwave signals are synchronously mixed and filtering process, obtain multiple intermediate-freuqncy signals；
A/D acquisition process is carried out to multiple intermediate-freuqncy signals, obtains multiple data signals；
Down-converted is carried out to multiple data signals, obtains multiple baseband signals；
Calculated according to the multiple baseband signal using Multiple Signal Classification MUSIC wireless location algorithms, obtain multiple OBU's
In each OBU azimuth information.
In the embodiment of the present invention, the step of obtaining azimuth information is refined so that scheme is more careful.
For purposes of illustration only, the embodiment of the present invention prevents method that label signal collides, with based on roadside unit and OBU it
Between signal interaction exemplified by, roadside unit is typically mounted on above road or road sidepiece, has dual-mode antenna, for OBU
Send microwave signal and receive the microwave signal from OBU, and the information to receiving and sending is handled；OBU also has day
Line, for sending microwave signal to roadside unit and receiving the microwave signal from roadside unit, OBU is typically mounted on vehicle
It is interior, such as be fixed on the front windshield of vehicle.
Signal processing apparatus receives the microwave signal that multiple OBU are sent, and the microwave signal that OBU is sent can be itself and ETC
Any one microwave signal in system communication processes, multiple OBU microwave signal is synchronously mixed and filtering process, obtained
Multiple intermediate-freuqncy signals, A/D acquisition process is carried out to multiple intermediate-freuqncy signals, multiple data signals are obtained, to the plurality of data signal
Down-converted is carried out, obtains multiple baseband signals, calculating multiple base band using Multiple Signal Classification MUSIC wireless location algorithms believes
Number, obtain the azimuth information of each OBU in multiple OBU, it is possible to understand that, the multiple OBU of above-mentioned synchronization process microwave
Synchronization when signal is not to say that multiple OBU transaction steps, but illustrate that signal processing apparatus can lead to multiple OBU simultaneously
Letter, transaction step corresponding to the microwave signal between each OBU can differ, and processing time does not require completely the same yet, with
Multiple real-time trading situations of OBU are defined, specifically, as shown in Figure 2：
Assuming that the spacing between each bay is d, the incident direction of the microwave signal that OBU is sent (i.e. with antenna linear array
Angle between normal) it is θ, if it is assumed that the bay in Fig. 2 marked as 0 is time reference antenna, then from the micro- of OBU
Ripple signal reach adjacent antenna array element wave path-difference be d sin θs, arrival adjacent antenna array element time difference be:
Wherein, C is the light velocity.
The phase difference of microwave signal that adjacent antenna array element receives is：
λ is the centre wavelength of frequency corresponding to microwave signal.
The microwave signal of the bay of each numbering is respectively：
x0(t)=s (t) ejωt
The microwave signal that phased-array antenna array receives is write as matrix form and is：
Wherein, α (θ) be microwave signal direction vector, numerical value only depend on aerial array geometry (known) and
The direction of propagation (unknown) of microwave signal.
After being weighted summation to the microwave signal of N number of reception, the signal after the shaping of output is：
Y (t)=WHX (t)=s (t) WHα(θ)
If PW(θ)=WHα (θ) is the directional diagram of microwave signal weighting, works as WHTo some directionθ0 Microwave signal with phase phase
The P that added-time obtainsW(θ0) modulus value it is maximum, maximum signal to noise ratio can be formed in the arrival bearing of microwave signal, it is actual for x (t)
On realize Space domain sampling signal, therefore to calculating orientation angle corresponding to maximum signal to noise ratio beam signal, passing through spatial domain filter
Ripple determinesθ0 , and direction angle is the angle between microwave signal and aerial array normal from OBU, as OBU's
Azimuth information.
The principle for including target OBU, LMS spatial domain filter algorithms in multiple OBU is specific as follows：
It is assumed here that the bay of phased-array antenna array be 2, one marked as 0, another is marked as 1, at certain
The microwave signal that individual moment OBU is sent is assumed to be s0, direction angle alpha and angle of pitch β in the azimuth information of the OBU, the OBU
Microwave signal corresponding to steering vector：
A=exp (- j*2* π * [0 1] * cos (α) * sin (β))
R=s0.′*a
The microwave signal vector received is r=[r0 r1]T, airspace filter is two structures for entering scene 2, then output is：
Y0=W0r0 Y1=W1r1
W0=[W0,0,W0,1] W1=[W1,0,W1,1]
W0And W1It is the weighted vector of the airspace filter of corresponding bay 0 and bay 1 respectively, airspace filter is defeated
The error variance gone out is：
e0=y0-h0s0=W0r-r0,d
e1=y1-h1s0=W1r-r1,d
Wherein, r0,dAnd r1,dMicrowave caused by the same OBU being respectively received for bay 0 and bay 1 is believed
Number, write out error vector form：
E [n]=Wr [n]-rd[n]
E [n]=[e in formula0,e1]T, W [n]=[w0,w1]T, r [n]=[r0,d,r1,d]T.Airspace filter based on LMS
Best weight value is tried to achieve by following function：
U=W ' * r [n]
W=W-r [n] * (u-s0[n])
The preamble information that target OBU is sent is received, using target OBU preamble signal as training sequence, using base
The best weight value of airspace filter is calculated in the LMS algorithm of MMSE criterions, multiple microwave signals are weighted according to best weight value
Vector Processing, i.e., directive gain is gathered on target OBU direction, filters out the micro- of the different OBU transmissions in other locus
Ripple signal, after multiple baseband signals are by airspace filter, the cochannel interference microwave signal on other locus is partly supported
Disappear, during so as to ensure that target OBU is that roadside unit is traded, do not disturbed by other OBU.
Signal processing apparatus in the embodiment of the present invention is applied in the roadside unit function class product in ETC system,
Suitable for the system of other application roadside unit, such as free streaming system.
Referring to Fig. 3, the embodiment of the present invention provides a kind of signal processing apparatus, including：
Receiving unit 301, for receiving the multiple OBU microwave signal sent by phased-array antenna array, obtain more
Individual microwave signal；
Computing unit 302, for determining the azimuth information of each OBU in multiple OBU according to multiple microwave signals；
Processing unit 303, for according to azimuth information, being handled using airspace filter multiple OBU microwave signal,
Make it that in addition to target OBU microwave signal, the microwave signal of the OBU on other locus is cancelled, target OBU is current
Merchandise OBU.
Optionally, processing unit 303, specifically for according to azimuth information, based on minimum mean square error criterion MMSE to institute
The microwave signal for stating multiple OBU is weighted Vector Processing.
In the embodiment of the present invention, receiving unit 301 receives the multiple OBU microwave signal sent, the basis of computing unit 302
Multiple microwave signals determine the azimuth information of each OBU in multiple OBU, and processing unit 303 is according to azimuth information, using spatial domain
Filter and multiple OBU microwave signal is handled, to cause in addition to target OBU microwave signal, on other locus
OBU microwave signal is cancelled, and target OBU is current transaction OBU, in the case where multiple OBU be present, determines each OBU side
After the information of position, multiple OBU microwave signal is handled by airspace filter so that in addition to target OBU microwave signal, its
The microwave signal of OBU on his locus is cancelled, and therefore, reduces interference of other OBU to target OBU.
It should be noted that the embodiment of the present invention prevent the method for tag-collision except for roadside unit and OBU it
Between signal interaction scene, can be also used in other scenes, do not limit herein.
Referring to Fig. 4, the embodiment of the present invention provides a kind of roadside unit, including：
Signal processing apparatus 30 and phased array antenna 401, phased-array antenna array 401 be made up of a plurality of submatrixs it is micro-
Band aerial array, and the circular polarized antenna linear array system realized by double-fed point orthogonal manner, phased array antenna 401 are used to receive
The microwave signal that multiple OBU are sent, and multiple microwave signals are sent to signal processing apparatus 30.
For purposes of illustration only, the embodiment of the present invention prevents method that label signal collides, with based on roadside unit and OBU it
Between signal interaction exemplified by, roadside unit has two bays (one of numbering is 0, a volume with as shown in Figure 4
Number the microwave signal that multiple OBU send is received for phased-array antenna array 401 1), phased-array antenna array 401 is commonly installed
Above road or road sidepiece, OBU also have antenna, and trackside list is come from for sending microwave signal to roadside unit and receiving
The microwave signal of member, OBU is typically mounted in vehicle, such as is fixed on the front windshield of vehicle.
Roadside unit receives the microwave signal that multiple OBU are sent, and the microwave signal that OBU is sent can be itself and ETC system
Any one microwave signal in communication process, multiple OBU microwave signal is synchronously mixed and filtering process, obtained multiple
Intermediate-freuqncy signal, A/D acquisition process is carried out to multiple intermediate-freuqncy signals, obtains multiple data signals, the plurality of data signal is carried out
Down-converted, multiple baseband signals are obtained, multiple baseband signals are calculated using Multiple Signal Classification MUSIC wireless location algorithms,
Obtain the azimuth information of each OBU in multiple OBU, it is possible to understand that, the multiple OBU of above-mentioned synchronization process microwave signal
Synchronization when being not to say that multiple OBU transaction steps, but illustrate that signal processing apparatus can communicate with multiple OBU simultaneously, respectively
Transaction step can differ corresponding to microwave signal between OBU, and processing time does not require completely the same yet, with multiple
The real-time trading situations of OBU are defined, specifically, as shown in Figure 2：
Spacing between bay 0 and bay 1 is d, the incident direction of the microwave signal that OBU is sent (i.e. with day
Angle between line linear array normal) it is θ, if it is assumed that the bay in Fig. 2 marked as 0 is time reference antenna, then come from
The wave path-difference that OBU microwave signal reaches bay 1 be d sin θs, and the time difference of arrival bay 1 is:
Wherein, C is the light velocity.
The phase difference of microwave signal that bay 1 receives is：
λ is the centre wavelength of frequency corresponding to microwave signal.
The microwave signal of bay 0 and bay 1 is respectively：
x0(t)=s (t) ejωt
The microwave signal that receiving unit 301 in signal processing apparatus 30 receives is write as matrix form and is：
Wherein, α (θ) is the direction vector of microwave signal, and numerical value only depends on the geometry of phased-array antenna array 401
The direction of propagation of (known) and microwave signal (unknown).
After computing unit 302 is weighted summation to the microwave signal of N number of reception, the signal after the shaping of output is：
Y (t)=WHX (t)=s (t) WHα(θ)
If PW(θ)=WHα (θ) is the directional diagram of microwave signal weighting, works as WHTo some directionθ0 Microwave signal with phase phase
The P that added-time obtains W (θ0) modulus value it is maximum, maximum signal to noise ratio can be formed in the arrival bearing of microwave signal, it is actual for x (t)
On realize Space domain sampling signal, therefore to calculating orientation angle corresponding to maximum signal to noise ratio beam signal, passing through spatial domain filter
Ripple determinesθ0 , and direction angle is the angle between microwave signal and the normal of phased-array antenna array 401 from OBU,
As OBU azimuth information.
Include the original of target OBU, LMS spatial domain filter algorithms in multiple OBU corresponding to the microwave signal received
Manage specific as follows：
It is s in the microwave signal that sometime OBU is sent0, processing unit 303 is according to the side in the azimuth information of the OBU
To angle α and the angle of pitch, steering vector corresponding to the microwave signal of the OBU is obtained：
A=exp (- j*2* π * [0 1] * cos (α) * sin (β))
R=s0.′*a
The microwave signal vector received is r=[r0 r1]T, airspace filter is two structures for entering scene 2, then output is：
Y0=W0r0 Y1=W1r1
W0=[W0,0,W0,1] W1=[W1,0,W1,1]
W0And W1It is the weighted vector of the airspace filter of corresponding bay 0 and bay 1 respectively, airspace filter is defeated
The error variance gone out is：
e0=y0-h0s0=W0r-r0,d
e1=y1-h1s0=W1r-r1,d
Wherein, r0,dAnd r1,dMicrowave caused by the same OBU being respectively received for bay 0 and bay 1 is believed
Number, write out error vector form：
E [n]=Wr [n]-rd[n]
E [n]=[e in formula0,e1]T, W [n]=[w0,w1]T, r [n]=[r0,d,r1,d]T.Airspace filter based on LMS
Best weight value is tried to achieve by following function：
U=W ' * r [n]
W=W-r [n] * (u-s0[n])
Receiving unit 301 receives the preamble information of target OBU transmissions, processing unit by phased-array antenna array 401
303, using target OBU preamble signal as training sequence, airspace filter are calculated using the LMS algorithm based on MMSE criterions
Best weight value, processing unit 303 is weighted Vector Processing according to best weight value to multiple microwave signals, i.e., by phased array antenna
The directive gain of array received is gathered on target OBU direction, filters out the microwave letter that the different OBU in other locus is sent
Number, after multiple baseband signals are by airspace filter, the cochannel interference microwave signal on other locus is partially offset, from
And when ensure that target OBU is that roadside unit is traded, do not disturbed by other OBU.
It will be understood by those skilled in the art that all or part of step of various methods can pass through in above-mentioned embodiment
Program instructs related hardware to complete, and the program can be stored in a computer-readable recording medium, storage medium can wrap
Include：Read-only storage, random access memory, disk or CD etc..
Above content is to combine specific embodiment further description made for the present invention, it is impossible to assert this hair
Bright specific implementation is confined to these explanations.For general technical staff of the technical field of the invention, do not taking off
On the premise of from present inventive concept, some simple deduction or replace can also be made.
Claims (9)
1. a kind of method for preventing label signal from colliding, applied to the roadside unit comprising phased-array antenna array, its feature exists
In, including：
The microwave signal sent by the multiple OBU of phased-array antenna array reception, obtains multiple microwave signals；
The azimuth information of each OBU in the multiple OBU is determined according to the multiple microwave signal；
According to the azimuth information, the multiple OBU microwave signal is handled using airspace filter, directive gain is gathered
Collection is on target OBU direction, to cause in addition to target OBU microwave signal, the microwave signal of the OBU on other locus
It is cancelled, the target OBU is current transaction OBU.
2. according to the method for claim 1, it is characterised in that it is described according to the azimuth information, using airspace filter pair
The multiple OBU microwave signal, which carries out processing, to be included：
According to the azimuth information, the multiple OBU microwave signal is weighted based on minimum mean square error criterion MMSE
Vector Processing.
3. according to the method for claim 2, it is characterised in that the minimum mean square error criterion MMSE that is based on is to described more
Individual OBU microwave signal, which is weighted Vector Processing, to be included：
The microwave signal of the target OBU is selected as training sequence；
The best weight value of airspace filter is calculated using least-mean-square error algorithm LMS；
Vector Processing is weighted to the multiple microwave signal according to best weight value.
4. according to the method for claim 3, it is characterised in that the microwave signal for selecting the target OBU is as instruction
Practicing sequence includes：
The preamble signal that the selected target OBU is sent, using the preamble signal that the target OBU is sent as training sequence
Row.
5. method according to any one of claim 1 to 4, it is characterised in that described according to the multiple microwave signal
Determining the azimuth information of each OBU in the multiple OBU includes：
The multiple microwave signal is synchronously mixed and filtering process, obtains multiple intermediate-freuqncy signals；
A/D acquisition process is carried out to the multiple intermediate-freuqncy signal, obtains multiple data signals；
Down-converted is carried out to the multiple data signal, obtains multiple baseband signals；
Calculated according to the multiple baseband signal using Multiple Signal Classification MUSIC wireless location algorithms, obtain the multiple OBU's
In each OBU azimuth information.
A kind of 6. signal processing apparatus, applied to the roadside unit comprising phased-array antenna array, it is characterised in that including：
Receiving unit, for receiving the multiple OBU microwave signal sent by the phased-array antenna array, obtain multiple micro-
Ripple signal；
Computing unit, for determining the azimuth information of each OBU in the multiple OBU according to the multiple microwave signal；
Processing unit, for according to the azimuth information, using airspace filter to the multiple OBU microwave signal at
Reason, directive gain is gathered on target OBU direction, to cause in addition to target OBU microwave signal, on other locus
OBU microwave signal be cancelled, the target OBU is current transaction OBU.
7. device as claimed in claim 6, it is characterised in that
The processing unit, specifically for according to the azimuth information, based on minimum mean square error criterion MMSE to the multiple
OBU microwave signal is weighted Vector Processing.
A kind of 8. roadside unit, it is characterised in that：At signal including phased-array antenna array and as claimed in claims 6 or 7
Manage device.
9. roadside unit as claimed in claim 8, it is characterised in that：The phased-array antenna array is by a plurality of submatrix structures
Into micro-strip antenna array, and pass through double-fed point orthogonal manner realize circular polarized antenna linear array system.
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| CN111131102B (en) * | 2019-12-27 | 2023-04-14 | 北京万集科技股份有限公司 | Baseband waveform processing method and apparatus, storage medium, and electronic apparatus |
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