CN101068123A - Radar transmit-receive antenna uncoupling method and device - Google Patents
Radar transmit-receive antenna uncoupling method and device Download PDFInfo
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- CN101068123A CN101068123A CN 200710041231 CN200710041231A CN101068123A CN 101068123 A CN101068123 A CN 101068123A CN 200710041231 CN200710041231 CN 200710041231 CN 200710041231 A CN200710041231 A CN 200710041231A CN 101068123 A CN101068123 A CN 101068123A
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Abstract
A decoupling method of radar transmitting-receiving antenna includes utilizing a multiphase adaptive finite long filter to simulate physical coupled channel between receiving and transmitting antennas of radar, carrying out medium frequency digitalization and M numbers of uniform sub-band phase-split treatments on signal from receiving antenna and reference signal coupled from transmitting antenna to realize adaptive couple elimination, carrying out update in corresponding sub-band and using multiphase synthetic filter set to process error signal from each sub-band for making each sub-band contain no signal coupled from transmitting antenna.
Description
Technical field
The present invention relates to signal processing method and device, particularly a kind of radar transmit-receive antenna uncoupling method and device.
Background technology
Because the present radar overwhelming majority is antenna of transmit-receive sharing, make that like this radar can not the receiving target echo-signal during launching, in order to reduce closely blind area of radar, radar waveform the time widely can not design very widely, can not accomplish to launch low pulse power, high-octane radar signal, cause radar detection ability, low probability of intercept all to be restricted, influenced the further raising of radar performance.If the new radar system of using the sending and receiving antenna to separate just can accomplish to launch low pulse power, high-octane radar signal wide when big, thus improve radar detectivity, reduce radar by intercept probability, and the antijamming capability of raising radar.But dual-mode antenna separates and has the mutual coupling problem between the aft antenna, the signal that is transmitting radar antenna couples directly to reception antenna without the space transmission, cause saturation of receiver cisco unity malfunction, this mutual coupling technical problem must be resolved and can realize that radar transmit-receive antenna effectively separates.
Summary of the invention
The object of the present invention is to provide a kind of radar transmit-receive antenna uncoupling method and device, be used for removing the signal component of coming from the transmitting antenna array coupling from the receiving antenna array column signal of radar transmit-receive antenna, make and to obtain the gain of coupling isolation between the radar transmit-receive antenna, realize effectively separating of radar transmit-receive antenna.
To achieve the above object, the invention provides a kind of radar transmit-receive antenna uncoupling method, described radar transmit-receive antenna comprises receiving antenna array and transmitting antenna array, described method is used for removing the signal component of coming from the transmitting antenna array coupling from the receiving antenna array column signal, it comprises the following steps: that (1) handle the signal that receives on the receiving antenna array, obtains base band receiving array signal x (n); (2) analog of coming from the transmitting antenna array coupling is handled, obtained baseband transmission array reference signal y (n); (3) base band receiving array signal x (n) is split processing mutually with baseband transmission array reference signal y (n) through identical M band, obtain each corresponding base band receiving array subband signal x
i(n) and baseband transmission array reference sub signal y
i(n), wherein, i=0,1 ..., M-1; (4) with baseband transmission array reference sub signal y
i(n) send into corresponding self adaptation finite length filtering device h
i(n), obtain the coupling subband signal s of corresponding simulating
i(n), wherein,
I=0,1 ..., M-1, K are natural numbers; (5) with each base band receiving array subband signal x
i(n) send into constantly the self adaptation finite length filtering device h of the correspondence of renewal in time
i(n), then from x
i(n) deduct corresponding coupling subband signal s in
i(n), obtain corresponding error subband signal e
i(n)=x
i(n)-s
i(n), i=0,1 ..., M-1; (6) with baseband transmission array reference sub signal y
i(n) and error subband signal e
i(n) send into corresponding least mean-square error estimator, estimate the tap coefficient h of the sub-band adaptive finite length filtering device that is used for simulating coupling path
I1(n), i=0,1 ..., M-1; (7) the tap coefficient h of each sub-band adaptive finite length filtering device
I1(n) exponent number is K according to the delay adjustments of maximum coupling channel, tap coefficient h
I1(n) the more new formula of numerical value is h
I1(n)=h
I1(n-1)+μ e
i(n) y
i* (n), i=0,1 ..., M-1, wherein on behalf of conjugation, * handle, and μ is the convergence factor of least-mean-square error algorithm; (8) with each error subband signal e
i(n), i=0,1 ..., M-1 handles through heterogeneous synthetic filtering, obtains the error signal e (n) after the uncoupling.
Another program of the present invention provides a kind of radar transmit-receive antenna uncoupling device, described radar transmit-receive antenna comprises receiving antenna array and transmitting antenna array, described device is used for removing the signal component of coming from the transmitting antenna array coupling from the receiving antenna array column signal, it comprises: the multiphase filtering resolving cell is respectively applied for receiving antenna array column signal x (n) and launching antenna array column signal y (n) is decomposed into receiving array subband signal x
i(n) and emission array reference sub signal y
i(n), wherein, i=0,1 ..., M-1; Self adaptation finite length filtering device group h
i(n), be used for actual coupling channel s between analog transmissions antenna and the receiving antenna array
i(n), wherein,
I=0,1 ..., M-1, K are natural numbers; Subtracter is from receiving array subband signal x
i(n) deduct corresponding coupling subband signal s in
i(n), obtain corresponding error subband signal e
i(n)=x
i(n)-s
i(n), i=0,1 ..., M-1; The least mean-square error estimator receives emission array reference sub signal y
i(n) and error subband signal e
i(n), to estimate at limit for length's sef-adapting filter h
i(n) unit impulse response h
I1(n), if h
I1(n) exponent number is K according to the delay adjustments of maximum coupling channel, tap coefficient h
I1(n) the more new formula of numerical value is h
I1(n)=h
I1(n-1)+μ e
i(n) y
i* (n), i=0,1 ..., M-1, wherein on behalf of conjugation, * handle, and μ is the convergence factor of least-mean-square error algorithm; The multiphase filtering synthesis unit is used for each error subband signal e
i(n), i=0,1 ..., M-1 handles through heterogeneous synthetic filtering, obtains the error signal e (n) after the uncoupling.
The present invention has used the sub-band adaptive least-mean-square error algorithm, become M subband uniformly by non-" in vain " spectrum division with receiving radar target reflection echo-signal, and on each subband, carry out the least mean-square error Adaptive Signal Processing, obviously the narrow band signal on each subband has than the original better noise like character of full range band received signal, therefore adopt method and apparatus of the present invention to carry out the radar transmit-receive antenna uncoupling, have and restrain effect and convergence rate faster preferably, make and to obtain the gain of coupling isolation between the radar transmit-receive antenna, and have parallel hard-wired advantage.
Description of drawings
Radar transmit-receive antenna uncoupling method of the present invention and device are provided by following embodiment and accompanying drawing.
Fig. 1 is for using the radar transmit-receive antenna uncoupling workflow schematic diagram of the inventive method;
Fig. 2 is the structural representation of radar transmit-receive antenna uncoupling device of the present invention;
Fig. 3 is the concrete structure schematic diagram of multiphase filtering resolving cell among the present invention;
Fig. 4 is the concrete structure schematic diagram of multiphase filtering synthesis unit among the present invention.
Embodiment
Below will be described in further detail radar transmit-receive antenna uncoupling method of the present invention and device.
The specific implementation step of radar transmit-receive antenna uncoupling method of the present invention is as follows:
(1) receiving antenna array is listed the signal that receives and carry out rf filtering, and be down-converted to the intermediate frequency frequency range, be down sampled to base band, obtain base band receiving array signal x (n) through after the analog-to-digital conversion;
(2) from the transmitting antenna array coupling analog of coming, through rf filtering be down-converted to the intermediate frequency frequency range and handle, and then be down sampled to base band through after the analog-to-digital conversion, obtain baseband transmission array reference signal y (n);
(3) base band receiving array signal x (n) is split processing mutually with baseband transmission array reference signal y (n) through identical M band, obtain each corresponding base band receiving array subband signal x
i(n) and baseband transmission array reference sub signal y
i(n), i=0,1 ..., M-1;
(4) with baseband transmission array reference sub signal y
i(n) send into corresponding self adaptation finite length filtering device h
i(n), obtain the coupling subband signal of corresponding simulating
I=0 wherein, 1 ..., M-1, K are natural numbers, by the maximum delay of coupling channel and the sample rate decision of antenna uncoupling treatment system, its numerical value can carry out the self adaptation adjustment in the practical work process of antenna uncoupling treatment system.
(5) base band receiving array subband signal x that each is corresponding
i(n) send into the corresponding subband self adaptation finite length filtering device h that constantly upgrades in time
i(n), then from x
i(n) deduct corresponding subband coupled signal s in
i(n), obtain corresponding error signal subband signal e
i(n)=x
i(n)-s
i(n), i=0,1 ..., M-1;
(6) with baseband transmission array reference sub signal y
i(n) and error signal subband signal e
i(n) send into corresponding least mean-square error estimator, estimate the tap coefficient h of the sub-band adaptive finite length filtering device that is used for simulating coupling path
I1(n), i=0,1 ..., M-1;
(7) the tap coefficient h of each sub-band adaptive finite length filtering device
I1(n) exponent number is K according to the delay adjustments of maximum coupling channel, tap coefficient h
I1(n) the more new formula of numerical value is h
I1(n)=h
I1(n-1)+μ e
i(n) y
i* (n), i=0,1,, M-1, wherein on behalf of conjugation, * handle, μ is the convergence factor of least-mean-square error algorithm, and the selection of convergence factor μ will be compromised between convergence rate and dual-mode antenna uncoupling effect, the set basis actual conditions of this factor and deciding;
(8) with each subband error signal e
i(n), i=0,1 ..., M-1 handles through heterogeneous synthetic filtering, obtains whole error signal e (n), no longer comprises the transmitting antenna array signal component that coupling is come among the e (n).
The workflow schematic diagram of Fig. 1 for using method of the present invention to carry out the radar transmit-receive antenna uncoupling, as shown in Figure 1, after receiving antenna array (representing with heavy line among the figure) signal x (n) and transmitting antenna array (representing with thick dashed line among the figure) coupling reference signal y (n) process dual-mode antenna coupling channel h (n) and minimum mean square self-adaption are estimated, the dual-mode antenna coupled signal s (n) that obtains simulating.From receiving antenna array column signal x (n), deduct s (n) and just can obtain error signal e (n), obviously no longer comprise the signal component of coming in the error signal e (n), be the signal that the present invention will obtain from the transmitting antenna array coupling.
Below in conjunction with Fig. 2～Fig. 4, radar transmit-receive antenna uncoupling device of the present invention is specifically described.
As shown in Figure 2, radar transmit-receive antenna uncoupling device of the present invention mainly adopts M to be with heterogeneous subband least mean-square error adaptive filter algorithm to realize, make base band receiving array signal x (n) and baseband transmission array reference signal y (n) through multiphase filtering resolving cell 1, obtain each corresponding base band receiving array subband signal x
i(n) and baseband transmission array reference sub signal y
i(n), i=0,1 ..., M-1, the concrete structure of multiphase filtering resolving cell 1 will be narrated in the back.
Then, with baseband transmission array reference sub signal y
i(n) send into corresponding self adaptation finite length filtering device h
i(n) 2, i=0 ..., M-1.For example: y
0(n) send into h
0(n), y
M-1(n) send into h
M-1(n), obtain the coupling subband signal of corresponding simulating
Then that each is corresponding base band receiving array subband signal x
i(n) send into the corresponding subband self adaptation finite length filtering device h that constantly upgrades in time
i(n) 2, and from x
i(n) deduct corresponding subband coupled signal s in
i(n), obtain corresponding error subband signal e
i(n)=x
i(n)-s
i(n), i=0,1 ..., M-1.
With baseband transmission array reference sub signal y
i(n) and error subband signal e
i(n)=x
i(n)-s
i(n) send into corresponding least mean-square error estimator 3, estimate the tap coefficient h of the sub-band adaptive finite length filtering device 2 that is used for simulating coupling path
I1(n).The tap coefficient h of each sub-band adaptive finite length filtering device 2
I1(n) exponent number is K according to the delay adjustments of maximum coupling channel, tap coefficient h
I1(n) the more new formula of numerical value is h
I1(n)=h
I1(n-1)+μ e
i(n) y
i* (n), wherein on behalf of conjugation, * handle, and μ is the convergence factor of least-mean-square error algorithm, and the selection of convergence factor μ will be compromised between convergence rate and dual-mode antenna uncoupling effect, the set basis actual conditions of μ and deciding.
At last with each subband error signal e
i(n), i=0,1 ..., M-1 handles through multiphase filtering synthesis unit 4, obtains whole error signal e (n), no longer comprises the transmitting antenna array signal component that coupling is come among the e (n).
Fig. 3 is the concrete structure schematic diagram of multiphase filtering resolving cell 1 among the present invention, referring to Fig. 3, and base band receiving antenna array subband signal x
i(n) and baseband transmission aerial array reference sub signal y
i(n), i=0,1 ..., obtaining by multiphase filtering decomposition channel filter group of M-1 realizes, with base band receiving antenna array column signal x (n) (or baseband transmission aerial array reference signal y (n)) process each road N times down-sampling and multiphase filtering H
i(Z
F) handle and just can obtain x
i(n) (or y
i(n)).Wherein, N is decided by the bandwidth of operation of radar system and the processing speed of chip; Each road multiphase filtering H
i(Z
F) coefficient h
I2(n) obtain like this: at first design a lowpass prototype filter h (n), h (n) is carried out M extraction processing doubly obtain h
i' (n)=and h (Mn+i), i=0,1 ..., M-1 is again with h
i' (n) carry out the doubly interior zero insertion processing of F just can obtain H
i(Z
F) coefficient h
I2(n).
As shown in Figure 4, the multiphase filtering synthesis unit 4 among the present invention is with each roadbed band error subband signal e
i(n), i=0,1 ..., M-1 is through each road N times up-sampling and multiphase filtering H
i(Z
F) handle, obtain whole baseband error signal e (n), wherein, N is decided by the bandwidth of operation of radar system and the processing speed of chip; Each road multiphase filtering H
i(Z
F) coefficient h
I2(n) obtain like this: at first design a lowpass prototype filter h (n), h (n) is carried out M extraction processing doubly obtain h
i' (n)=and h (Mn+i), i=0,1 ..., M-1 is again with h
i' (n) carry out the doubly interior zero insertion processing of F just can obtain H
i(Z
F) coefficient h
I2(n).
In sum, the physical coupling channel that the present invention utilizes a heterogeneous self adaptation finite length filtering device group 2 to come between guinea pig transmitting antenna and the reception antenna, the receiving antenna array column signal splits processing mutually through if digitization with the individual subband uniformly of M respectively with the reference signal of coming from the direct coupling of transmitting antenna array, realizes self adaptation coupling elimination again in each subband of correspondence.In the subband of correspondence, K tap coefficient of sub-band adaptive finite length filtering device 2 upgraded by the least mean-square error adaptive algorithm, the output error signal of each subband will no longer comprise the signal that the transmitting antenna array coupling is come after handling through multiphase filtering synthesis unit 4.
The uncoupling processing procedure of whole radar transmit-receive antenna array is placed in the subband of relative narrower carries out, the processing speed of each subband is reduced to the 1/M of system handles speed, self-adaptive processing signal on each subband has better noise like character, therefore has quick convergence and easily parallel hard-wired advantage.
The present invention is applicable to that input signal has the occasion of reasonable noise like character (being that conditional number approaches 1).
Claims (14)
1, a kind of radar transmit-receive antenna uncoupling method, described radar transmit-receive antenna comprises receiving antenna array and transmitting antenna array, described method is used for removing the signal component of coming from the transmitting antenna array coupling from the receiving antenna array column signal, it is characterized in that, comprises the following steps:
(1) signal that receives on the receiving antenna array is handled, obtained base band receiving array signal x (n);
(2) analog of coming from the transmitting antenna array coupling is handled, obtained baseband transmission array reference signal y (n);
(3) base band receiving array signal x (n) is split processing mutually with baseband transmission array reference signal y (n) through identical M band, obtain each corresponding base band receiving array subband signal x
i(n) and baseband transmission array reference sub signal y
i(n), wherein, i=0,1 ..., M-1;
(4) with baseband transmission array reference sub signal y
i(n) send into corresponding self adaptation finite length filtering device h
i(n), obtain the coupling subband signal s of corresponding simulating
i(n), wherein,
I=0,1 ..., M-1, K are natural numbers;
(5) with each base band receiving array subband signal x
i(n) send into constantly the self adaptation finite length filtering device h of the correspondence of renewal in time
i(n), then from x
i(n) deduct corresponding coupling subband signal s in
i(n), obtain corresponding error subband signal e
i(n)=x
i(n)-s
i(n), i=0,1 ..., M-1;
(6) with baseband transmission array reference sub signal y
i(n) and error subband signal e
i(n) send into corresponding least mean-square error estimator, estimate the tap coefficient h of the sub-band adaptive finite length filtering device that is used for simulating coupling path
I1(n), i=0,1 ..., M-1;
(7) the tap coefficient h of each sub-band adaptive finite length filtering device
I1(n) exponent number is K according to the delay adjustments of maximum coupling channel, tap coefficient h
I1(n) the more new formula of numerical value is h
I1(n)=h
I1(n-1)+μ e
i(n) y
i* (n), i=0,1 ..., M-1, wherein on behalf of conjugation, * handle, and μ is the convergence factor of least-mean-square error algorithm;
(8) with each error subband signal e
i(n), i=0,1 ..., M-1 handles through heterogeneous synthetic filtering, obtains the error signal e (n) after the uncoupling.
2, radar transmit-receive antenna uncoupling method as claimed in claim 1, it is characterized in that: step (1) is carried out rf filtering to the signal that receives on the receiving antenna array, and be down-converted to the intermediate frequency frequency range, and be down sampled to base band through after the analog-to-digital conversion, obtain base band receiving array signal x (n).
3, radar transmit-receive antenna uncoupling method as claimed in claim 1, it is characterized in that: step (2) carries out rf filtering and is down-converted to the intermediate frequency frequency range the analog of coming from the transmitting antenna array coupling handling, and then be down sampled to base band after the process analog-to-digital conversion, obtain baseband transmission array reference signal y (n).
4, radar transmit-receive antenna uncoupling method as claimed in claim 1, it is characterized in that: the K in step (4) and the step (7) is by the maximum delay of coupling channel and the sample rate decision of antenna uncoupling treatment system, and its numerical value can carry out the self adaptation adjustment in the practical work process of antenna uncoupling treatment system.
5, radar transmit-receive antenna uncoupling method as claimed in claim 1 is characterized in that: convergence factor μ is according to the actual conditions selection of compromising between convergence rate and dual-mode antenna uncoupling effect.
6, radar transmit-receive antenna uncoupling method as claimed in claim 1 is characterized in that: in the step (3), it is with signal x (n) and y (n) process each road N times down-sampling and multiphase filtering H that described M band splits processing mutually
i(Z
F) handle and to obtain x
i(n) and y
i(n).
7, radar transmit-receive antenna uncoupling method as claimed in claim 1 is characterized in that: in the step (8), with each road error subband signal e
i(n) through each road N times up-sampling and multiphase filtering H
i(Z
F) handle, obtain the error signal e (n) after the uncoupling.
8, as claim 6 or 7 described radar transmit-receive antenna uncoupling methods, it is characterized in that: each road multiphase filtering H
i(Z
F) coefficient h
I2(n) be by designing a lowpass prototype filter h (n), h (n) being carried out M extraction processing doubly obtain h
i' (n)=and h (Mn+i), i=0,1 ..., M-1 is again with h
i' (n) carry out F doubly in zero insertion handle and to obtain.
9, as claim 6 or 7 described radar transmit-receive antenna uncoupling methods, it is characterized in that: N is decided by the bandwidth of operation of radar system and the processing speed of chip.
10, a kind of radar transmit-receive antenna uncoupling device, described radar transmit-receive antenna comprises receiving antenna array and transmitting antenna array, described device is used for removing the signal component of coming from the transmitting antenna array coupling from the receiving antenna array column signal, it is characterized in that described device comprises:
The multiphase filtering resolving cell is respectively applied for receiving antenna array column signal x (n) and launching antenna array column signal y (n) is decomposed into receiving array subband signal x
i(n) and emission array reference sub signal y
i(n), wherein, i=0,1 ..., M-1;
Self adaptation finite length filtering device group h
i(n), be used for actual coupling channel s between analog transmissions antenna and the receiving antenna array
i(n), wherein,
I=0,1 ..., M-1, K are natural numbers;
Subtracter is from receiving array subband signal x
i(n) deduct corresponding coupling subband signal s in
i(n), obtain corresponding error subband signal e
i(n)=x
i(n)-s
i(n), i=0,1 ..., M-1;
The least mean-square error estimator receives emission array reference sub signal y
i(n) and error subband signal e
i(n), to estimate at limit for length's sef-adapting filter h
i(n) unit impulse response h
I1(n), if h
I1(n) exponent number is K according to the delay adjustments of maximum coupling channel, tap coefficient h
I1(n) the more new formula of numerical value is h
I1(n)=h
I1(n-1)+μ e
i(n) y
i* (n), i=0,1 ..., M-1, wherein on behalf of conjugation, * handle, and μ is the convergence factor of least-mean-square error algorithm;
The multiphase filtering synthesis unit is used for each error subband signal e
i(n), i=0,1 ..., M-1 handles through heterogeneous synthetic filtering, obtains the error signal e (n) after the uncoupling.
11, radar transmit-receive antenna uncoupling device as claimed in claim 10, it is characterized in that: K is by the maximum delay of coupling channel and the sample rate decision of antenna uncoupling treatment system, and its numerical value can carry out the self adaptation adjustment in the practical work process of antenna uncoupling treatment system.
12, radar transmit-receive antenna uncoupling device as claimed in claim 10 is characterized in that: described multiphase filtering resolving cell is with signal x (n) and y (n) process each road N times down-sampling and multiphase filtering H
i(Z
F) handle and to obtain x
i(n) and y
i(n).
13, radar transmit-receive antenna uncoupling device as claimed in claim 10 is characterized in that: described multiphase filtering synthesis unit is with each road error subband signal e
i(n) through each road N times up-sampling and multiphase filtering H
i(Z
F) handle, obtain the error signal e (n) after the uncoupling.
14, as claim 12 or 13 described radar transmit-receive antenna uncoupling devices, it is characterized in that: N is decided by the bandwidth of operation of radar system and the processing speed of chip.
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| CN 200710041231 CN101068123A (en) | 2007-05-25 | 2007-05-25 | Radar transmit-receive antenna uncoupling method and device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208932A (en) * | 2011-04-11 | 2011-10-05 | 中国电子科技集团公司第五十四研究所 | Array antenna single-point mutual decoupling correction method |
| CN104343443A (en) * | 2013-07-26 | 2015-02-11 | 中国石油集团长城钻探工程有限公司 | Method for eliminating direct coupling signal in three-dimensional array induction logging instrument |
| CN109031282A (en) * | 2018-07-27 | 2018-12-18 | 西安空间无线电技术研究所 | The system that a kind of electronic reconnaissance and radar detection work at the same time |
| CN112166335A (en) * | 2018-05-18 | 2021-01-01 | 高通股份有限公司 | Proximity detection using adaptive mutual coupling cancellation |
| CN114204283A (en) * | 2021-12-08 | 2022-03-18 | 清华大学 | Decoupling method based on decoupling matrix |
-
2007
- 2007-05-25 CN CN 200710041231 patent/CN101068123A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208932A (en) * | 2011-04-11 | 2011-10-05 | 中国电子科技集团公司第五十四研究所 | Array antenna single-point mutual decoupling correction method |
| CN102208932B (en) * | 2011-04-11 | 2013-11-20 | 中国电子科技集团公司第五十四研究所 | Array antenna single-point mutual decoupling correction method |
| CN104343443A (en) * | 2013-07-26 | 2015-02-11 | 中国石油集团长城钻探工程有限公司 | Method for eliminating direct coupling signal in three-dimensional array induction logging instrument |
| CN112166335A (en) * | 2018-05-18 | 2021-01-01 | 高通股份有限公司 | Proximity detection using adaptive mutual coupling cancellation |
| CN109031282A (en) * | 2018-07-27 | 2018-12-18 | 西安空间无线电技术研究所 | The system that a kind of electronic reconnaissance and radar detection work at the same time |
| CN109031282B (en) * | 2018-07-27 | 2020-11-10 | 西安空间无线电技术研究所 | System for simultaneous working of electronic reconnaissance and radar detection |
| CN114204283A (en) * | 2021-12-08 | 2022-03-18 | 清华大学 | Decoupling method based on decoupling matrix |
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