CN103780296B - A kind of signal of Homogeneous Circular array antenna receives and distortion antidote - Google Patents
A kind of signal of Homogeneous Circular array antenna receives and distortion antidote Download PDFInfo
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- CN103780296B CN103780296B CN201410022363.5A CN201410022363A CN103780296B CN 103780296 B CN103780296 B CN 103780296B CN 201410022363 A CN201410022363 A CN 201410022363A CN 103780296 B CN103780296 B CN 103780296B
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Abstract
The present invention relates to a kind of reception of the signal of Homogeneous Circular array antenna and distortion antidote, comprise the following steps：Step 1：The amplitude/phase gain matrix estimation of receives link antenna array；Step 2：The mutual coefficient matrix estimation of receives link antenna array；Step 3：Receives link is corrected according to the amplitude/phase gain matrix of the receives link antenna array of estimation and mutual coefficient matrix；Step 4：The gain matrix estimation of transmitting chain antenna array；Step 5：Using the gain matrix of the transmitting chain of estimation and the mutual coefficient matrix of receives link, amplitude/phase correction is carried out to transmitting chain and mutual coupling is corrected.Compared with prior art, the present invention have can be to uniform circular array reception, transmitting chain carry out system-level correction, the advantages that scheme is complete and rectification effect is good.
Description
Technical field
The present invention relates to the signal reception of smart antenna in the communications field and distortion correcting technology, more particularly, to one kind
The signal of Homogeneous Circular array antenna receives and distortion antidote.
Background technology
With the development of wireless mobile telecommunication technology, the demand of mobile communication is also growing, and radio network technique is in itself
Limitation prevent it user often have wireless signal when disposing WLAN from continuing to meet high communication need
Be disturbed, signal penetration capacity it is poor, cause the common problem that transmission range is short.Making for limited frequency resource is improved using new technology
With efficiency, turn into the problem of people's growing interest.
Beam forming is the combination of antenna technology and Digital Signal Processing, and purpose is used for phasing signal and transmits or receive
So that system can support more users in limited frequency spectrum, so as to increase exponentially frequency spectrum service efficiency.Beam forming
Technology is applied to phased-array radar earliest, and forming narrow beam by multiple antenna elements is scanned, and is applied to communication neck later
Domain, the base station being mainly used in civilian mobile communication.Its general principle is entered using multi-antenna technology to each road signal of reception
Row weighting synthesis, determines signal arrival bearing, and precise positioning is carried out to signal source, produces multipath high-gain orientation spot beam,
Outstanding depth non line of sight function is provided.
When system uses array antenna, reception signal is influenceed by the amplitude/phase error of bay in itself, together
When aerial array the distance between unit typically smaller than half wavelength so that between the array element of array antenna with compared with
Strong coupling, this coupling can make the transmitting of signal and receive to produce distortion, so as to the beam forming of antenna array and incoming wave side
Produce large effect to estimation so that reception signal distortion is serious, largely have impact on beamforming receivers
Performance.Therefore, the mutual coupling coefficient of antenna array is obtained by calculating or testing measurement, carries out software according to this or the mutual coupling of hardware is rectified
Just have very important significance.And the crucial foundation for carrying out mutual coupling correction is the mutual coupling compensation coefficient matrix between array element.
Some scholars are just being directed to the research of array error antidote both at home and abroad at present, and the antidote proposed is main
It is divided into from antidote and the major class of active antidote two.Active antidote is by setting orientation accurately known in space
Auxiliary information source is estimated array error parameter offline；And then provide array error parameter and information source side simultaneously from antidote
The estimate of position.Although from antidote without the auxiliary source of known location, and then aided in without overcoming in source signal
The uncertain factor of carrying, but generally handle it is extremely complex, it is higher to the requirement of real-time of algorithm.In numerous active antidotes
In, See C M S etc. are in IEE Proceedings-Radar, Sonarand Navigation document method for
Array calibration in high-resolution sensor arrayprocessing propose one kind and are directed to array element
The active correction algorithm of the array errors such as mutual coupling, amplitude phase error, the algorithm obtain one group of correction source by matrix- eigenvector-decomposition
Direction vector estimates array error, and in order to simplify the discussion of problem, the document is also by mutual coupling matrix and amplitude phase error matrix
Product is estimated as an entirety, but algorithm does not make full use of DOA to estimate the influence to estimation of mutual coupling coefficient, iteration mistake
Cheng Wufa separates DOA errors and the intertexture of mutual coefficient errors, and calculating process still has redundancy.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of Homogeneous Circular array
The signal of antenna receives and distortion antidote, and reception that can be to uniform circular array, transmitting chain carry out system-level correction, scheme
Complete and rectification effect is good.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of signal of Homogeneous Circular array antenna receives and distortion antidote, it is characterised in that comprises the following steps：
Step 1：The amplitude/phase gain matrix estimation of receives link antenna array；
Step 2：The mutual coefficient matrix estimation of receives link antenna array；
Step 3：According to the amplitude/phase gain matrix of the receives link antenna array of estimation and mutual coefficient matrix to receiving
Link is corrected；
Step 4：The gain matrix estimation of transmitting chain antenna array；
Step 5：Using the gain matrix of the transmitting chain of estimation and the mutual coefficient matrix of receives link, to transmitting chain
Carry out amplitude/phase correction and mutual coupling correction.
Using near-field coupling antenna and far field correction source, successively to the amplitude/phase gain matrix of reception link antennas battle array
And mutual coefficient matrix.
The mutual coefficient matrix C of described receives link antenna array estimates：
Mutual coefficient matrix C estimations are reduced to characterize mutual coupling matrix to vectorial c estimation,
If n=2k+1 (k=1,2 ...), c={ 1c1c2…ck|ck…c2c1}；
If n=2k (k=1,2 ..), c={ 1c1c2…ck-1ckck-1...c2c1}。
Wherein ci(i=1,2 ..., k) for be (2 π/n) i to center of circle angle difference two array elements between the coefficient of coup；N is
Circular antenna array element number, k are corresponding independent element number.
Described is corrected specially to receives link：
Amplitude/phase gain error correction is carried out first, then estimates mutual coefficient matrix using DOA estimated results, is rectified
Signal after justWherein Yn×sFor the actual reception signal of circle battle array, Cn×nFor the mutual coupling coefficient square of n member circle battle arrays
Battle array, Gn×nFor gain error matrix.
, it is described to be specially to transmitting chain progress amplitude/phase correction and mutual coupling correction：
If antenna array intends transmission signal X, width phase, mutual coupling error correction, actual transmission signal X'=are carried out before transmission
Gt -1C-1X, after correction actual emanations to the signal in far field be Y=ACGtX'=ACGtGt -1C-1X=AX, wherein A be direction vector,
C is mutual coefficient matrix, the G of circle battle arraytFor transmitting chain gain error matrix.
Compared with prior art, the invention provides a set of complete Homogeneous Circular aerial array transmitting chain, reception chain
Road distorted signals antidote, a loop correction system is formed, it both can enter line distortion to the receives link of antenna array and rectify
Just, and by the estimation of the mutual coupling coefficient it is applied in transmitting chain, line distortion correction, its auxiliary source utilized is entered to transmitting chain
Less, accuracy of estimation is high.
Brief description of the drawings
Fig. 1 is the array antenna structure schematic diagram that the present invention applies；
Fig. 2 is the workflow diagram of the present invention.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
The present embodiment is implemented under premised on technical solution of the present invention, gives detailed embodiment and specific
Operating process, but protection scope of the present invention is not limited to following embodiments.
As shown in figure 1, by taking the Homogeneous Circular array antenna of 15 array elements as an example, all array elements are half-wave antenna, are operated in
Under 5GHz frequencies, the π of circle battle array radius R=6 λ/2.Receive, transmitting chain distortion antidote comprises the following steps：
Step 1：Near field correcting signal source is located to the circle centre position of Homogeneous Circular array antenna, correction source sends signal z1×m
={ z1, z2..., zm, m is to correct sequence length, antenna reception signalyi(i=1 ... 15)
For the reception signal sequence of i-th of array element.Amplitude/phasing matrix G15×15=diag { g }, g={ 1g2g3...g15, then near field is rectified
Just estimating amplitude/phase coefficient gi=avg { yi./y1, i=2,3...15；Use giReconstructed amplitude/phasing matrix G15×15=
diag{1g2g3...g15}；
Step 2：Far-field signal source sends signal sequence x1×s, amplitude/phase error is carried out to reception signal and corrected, will be connect
Collection of letters Y1′5×sThe inverse matrix of matrix premultiplication amplitude/phasing matrix, the signal battle array after being corrected
Using DOA algorithms to Y15×sMutual coupling is done, obtains estimating angle information θ, according to angle information and
The topological structure of even circular array, direction vector A is calculated15×1(θ)。
By receipt signal matrix Y15×sIt is related to the reception signal progress of the first array element, i.e.,To reception signal
Related RyWith direction vector A15×1(θ) does discrete Fourier transform respectively, then two frequency domain vectors of generation a little remove,
Obtain the sign vector c ' of coupling matrix on frequency domain
C '=FFT [Ry]./FFT[A15×1(θ)]
Coupling matrix C15×15It is the symmetrical toeplitz matrixes with cycle characteristics, and diagonal entry is 1.C15×15Can
To be characterized with its first row/column c,
C={ 1c1c2...c7c7...c2c1}；
Wherein ci(i=1,2 ..., 7) for be (2 π/n) i to center of circle angle difference two array elements between the coefficient of coup.
Vectorial c ' is characterized to coefficient of coup frequency domain do Fourier inversion and obtain c ", c "=c "1c″2...c″15, by c "
The one-component normalization of vectorial basis, obtains the sign vector c of symmetrical toeplitz coupling matrixs,
C "=IFFT (c ')
C=c "/c "1
Reconstruct to obtain mutual coefficient matrix C using c15×15。
Step 3：Receives link is corrected according to width/phase gain matrix and mutual coefficient matrix,
Step 4：Transmitting chain circular array send m groups snap vectorialFor a specific k (k=
1,2...15), vectorial component xi
OrderFor m groups xk, obtainAverage value, so as to obtain transmitting terminal width phase gain matrix
Estimate
Step 5：The transmission signal of antenna array is corrected.If antenna array intends transmission signal X, width should be carried out before transmission
Phase, mutual coupling error correction, actual transmission signal X'=Gt -1C-1X, so, the signal of actual emanations to far field is Y=ACGX'
=ACGtGt -1C-1X=AX.
Claims (3)
1. a kind of signal of Homogeneous Circular array antenna receives and distortion antidote, it is characterised in that comprises the following steps：
Step 1：The amplitude of receives link antenna array/phase gain Matrix Estimation；
Step 2：The mutual coefficient matrix estimation of receives link antenna array；
Step 3：According to the amplitude of the receives link antenna array of estimation/phase gain matrix and mutual coefficient matrix to receives link
Carry out amplitude/phase correction and mutual coupling correction；
Step 4：The amplitude of transmitting chain antenna array/phase gain Matrix Estimation；
Step 5：Utilize amplitude/phase gain matrix of the transmitting chain antenna array of estimation and the mutual coupling system of receives link antenna array
Matrix number, amplitude/phase correction is carried out to transmitting chain and mutual coupling is corrected；
It is described amplitude/phase correction to be carried out to receives link and mutual coupling correction is specially：
Amplitude/phase gain error correction is carried out first, and the mutual coupling of receives link antenna array is then estimated using DOA estimated results
Coefficient matrix, the signal after correctionWherein Yn×sFor the actual reception signal of receives link antenna array, Cn×n
For the mutual coefficient matrix of n member receives link antenna arrays, Gn×nFor gain error matrix；
It is described amplitude/phase correction to be carried out to transmitting chain and mutual coupling correction is specially：
If transmitting chain antenna array intends transmission signal X, amplitude/phase gain error correction is carried out before transmission, mutual coupling error is rectified
Just, actual transmission signal is X'=Gt -1C-1X, after correction actual emanations to the signal in far field be Y=ACGtX'=ACGtGt -1C-1X
=AX, wherein A are direction vector, and C is the mutual coefficient matrix of receives link antenna array, GtFor transmitting chain gain error square
Battle array；Wherein far field is that source is corrected in far field.
2. according to the method for claim 1, it is characterised in that source is corrected using near-field coupling antenna and far field, to receiving
The amplitude of link antennas battle array/phase gain matrix and mutual coefficient matrix are estimated.
3. according to the method for claim 1, it is characterised in that the mutual coefficient matrix C of described receives link antenna array
Estimation is specially：
Mutual coefficient matrix C estimation is reduced to characterize mutual coefficient matrix to vectorial c estimation,
If n=2k+1, k=1,2 ...；C={ 1 c1 c2 … ck ck … c2 c1}；
If n=2k, k=1,2 ..；C={ 1 c1 c2 … ck-1ckck-1 … c2 c1}；
Wherein ciFor be (2 π/n) i to the differential seat angle in the center of circle two array elements between the coefficient of coup, i=1,2 ..., k；N is antenna
The number of battle array, k are corresponding independent element number.
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| CN108318855B (en) * | 2018-01-24 | 2020-04-14 | 中国人民解放军国防科技大学 | Near-field and far-field mixed signal source positioning method based on uniform circular array |
| CN110086520B (en) * | 2019-03-29 | 2020-07-21 | 中国人民解放军火箭军工程大学 | Mutual coupling error calibration method for uniform octagonal array |
| CN111308412B (en) * | 2020-04-02 | 2021-02-23 | 深圳市华智芯联科技有限公司 | Antenna array correction method and device, computer equipment and storage medium |
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| JP2000091833A (en) * | 1998-09-14 | 2000-03-31 | Fujitsu Ltd | Array antenna receiver |
| CN1859031A (en) * | 2006-02-10 | 2006-11-08 | 华为技术有限公司 | Transmitting channel correcting method in multiple input multiple output system |
| CN101064902A (en) * | 2006-04-25 | 2007-10-31 | 大唐移动通信设备有限公司 | Method for real-time calibrating intelligent antenna |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000091833A (en) * | 1998-09-14 | 2000-03-31 | Fujitsu Ltd | Array antenna receiver |
| CN1859031A (en) * | 2006-02-10 | 2006-11-08 | 华为技术有限公司 | Transmitting channel correcting method in multiple input multiple output system |
| CN101064902A (en) * | 2006-04-25 | 2007-10-31 | 大唐移动通信设备有限公司 | Method for real-time calibrating intelligent antenna |
Non-Patent Citations (1)
| Title |
|---|
| " Mutual coupling compensation for small, circularly symmetric planar antenna arrays";D. E. N. Davies，;《Microwaves, Optics and Antennas, IEE Proceedings H》;20081111;第129卷(第5期);第281-283页 * |
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