CN106991217A - The method that butt coupling receives characteristic influence is analyzed based on receiving pattern method - Google Patents
The method that butt coupling receives characteristic influence is analyzed based on receiving pattern method Download PDFInfo
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Abstract
The present invention provides a kind of method that butt coupling receipts characteristic influence is analyzed based on receiving pattern method, comprises the following steps：Step 1, emulation Array Model is set up using FEKO softwares, the fixed skew between arrange parameter and incoming signal is emulated to model, and acquisition is some to include the output file of snap signal, the output file includes receiving data and English explanation；Step 2, the reception data in each output file are handled using Java programmings, obtained only comprising the file for receiving data；Step 3, the weights of all incident angle formation nulls are obtained using LCMV algorithms to the file of step 2；Step 4, the anti-interference reception directional diagram under all incident angles is obtained based on weights；Step 5, the influence to interference free performance is coupled according to anti-interference reception Directional Pattern Analysis.
Description
Technical field
It is particularly a kind of to receive special based on receiving pattern method analysis butt coupling the present invention relates to a kind of signal processing technology
Property influence method.
Background technology
Topmost two research directions of array signal processing, are adaptive array processing and Estimation of Spatial Spectrum.To this two
Analyzed, it is necessary to first analyze the reception characteristic of array in individual direction.
The numerical method such as moment method (MOM) of electromagnetism calculating, FInite Element (FEM), time-domain finite difference (FDTD)
Antenna array performance can be emulated well.Yet with the presence of coupling, the performance of array can not under emission mode
Directly it is equivalent to receive the performance under battle array.
At present, in order to verify that the antenna array produced, for the performance under reception pattern, is typically necessary in darkroom, use
Electromagnetic horn transmission signal, is rotated by turntable, measures some next upward reception characteristics of signals of current array.But actual measurement is needed
There is material object, cost is higher, and the number of angles surveyed is limited.
But in simulations, the anti-jamming effectiveness of emulation array, is all to produce analog signal with algorithm to carry out computing at present,
This can not reflect interference free performance of the array under reception well.One can be readily obtained currently without a method
Comprehensive reception characteristic --- the receiving pattern of array antenna.The problem of running into mainly has following：
(1) method of signal produced by being emulated with Matlab can not react the influence of the butt coupling collection of letters number well, and
And the analog signal produced is unable to closing to reality array, can only use preferable steering vector；
(2) the reception signal obtained on matched load can not be emulated with HFSS, it is impossible to for obtaining receiving pattern；
(3) FEKO softwares introduce moment method, the reception state of array antenna can be emulated exactly, by adding plane
Ripple, can calculate reception signal now with moment method.But the application method involved by prior art can only obtain one
The reception signal of incident angle, causes easily obtain the reception signal of all incident angles at present；
(4) it is multiplied in method in the past with the weights obtained with calculating with preferable steering vector, coupling can be obtained and caused
The conclusion of anti-interference null skew.
The content of the invention
It is an object of the invention to provide a kind of method that butt coupling receipts characteristic influence is analyzed based on receiving pattern method,
This method can be obtained under comprehensive incidence angle with rapid batch, the reception signal in microwell array load, while can also not had
There is the desired received signal under coupling, and processing is analyzed with algorithm.
This method comprises the following steps：
Step 1, emulation Array Model, the stationary phase between arrange parameter and incoming signal are set up using FEKO softwares
Difference, is emulated to model, and acquisition is some to include the output file of snap signal, and the output file includes receiving data and English
Explanation；
Step 2, the reception data in each output file are handled using Java programmings, obtained only comprising reception
The file of data；
Step 3, the weights of all incident angle formation nulls are obtained using LCMV algorithms to the file of step 2；
Step 4, the anti-interference reception directional diagram under all incident angles is obtained based on weights；
Step 5, the influence to interference free performance is coupled according to anti-interference reception Directional Pattern Analysis.
Compared with prior art, its remarkable advantage is the present invention：(1) acquisition of receiving pattern, can be with accurate evaluation
The interference free performance of individual aerial array；(2) simulation result is consistent with actual measurement conclusion, and existing research object of other technologies itself is only
Suitable for transmitting battle array, obtained conclusion can not be applied to receive battle array；(3) General Cell can be emulated, can also be square
Just the improvement situation to antenna receptivity such as drop coupling measure is verified；(4) to there is coupling and without the lower reception direction of coupling
The research of figure, can easily contrast butt coupling and receive characteristic, jamproof influence；(5) with former method, drawing and receiving
The method of directional diagram is different, and the method in the present invention is that the weights obtained with calculating are multiplied with real steering vector, rather than
Conclusion in the preferable steering vector that algorithm is calculated, the present invention is the zero line depth shallower that coupling only causes whole jamproof system
.
The present invention is described in further detail below in conjunction with the accompanying drawings.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention.
Fig. 2 is FEKO modelings and to add the illustraton of model of excitation in the present invention.
Fig. 3 is the embodiment of the present invention without the receiving pattern under coupling.
Fig. 4 is that have the receiving pattern under coupling in the embodiment of the present invention.
Fig. 5 is array received signal and correspondence weights demonstration graph in the present invention.
Embodiment
Method proposed by the present invention is the instrument FEKO using existing integrated moment method, is worked out a set of quickly through calculation
Method obtains the receiving pattern of General Cell, it is possible to analyze the influence that butt coupling receives characteristic and anti-interference purposes.Due to
In FEKO output file, the reception signal of each angle is scattered, and nobody attempts to obtain all incident angles simultaneously before
Under reception signal, it is main in the middle of there are several technologies not solve, method proposed by the present invention will be just provided below.
It is a kind of that the method that butt coupling receives characteristic influence, including following step are analyzed based on receiving pattern method with reference to Fig. 1
Suddenly：
Step 1, emulation Array Model, the stationary phase between arrange parameter and incoming signal are set up using FEKO softwares
Difference, is emulated to model, and acquisition is some to include the output file of snap signal, and the output file includes receiving data and English
Explanation；
Step 2, the reception data in each output file are handled using Java programmings, obtained only comprising reception
The file of data；
Step 3, the weights of all incident angle formation nulls are obtained using LCMV algorithms to the file of step 2；
Step 4, the anti-interference reception directional diagram under all incident angles is obtained based on weights；
Step 5, the influence to interference free performance is coupled according to anti-interference reception Directional Pattern Analysis.
If in step 1 obtain without coupling under reception data when model foundation it is as follows：According to the layout of array, set up
The antenna list in an antenna element, each model is only placed in the simulation model equal with antenna amount, each simulation model
First position is different, and is corresponded with the layout under array.
The detailed process that step 1 obtains the output file for having the reception data under coupling is：
Step 1.1.1, emulation Array Model is set up using FEKO softwares, and arrange parameter, parameter connects matching including port
Dielectric space residing for load value, model be vacuum, output matching load on electric current, solving precision be double precision, incoming signal
Scanning pitch range, the scan position angular region of incoming signal；
Step 1.1.2, to each incoming signal, sets a fixed skew so that prolong in adjacent incoming signal phase
Slow same fixed skew；
Step 1.1.3, is emulated to model, often emulates once one out of outputiFile, the outiIncluded in file
Snap signal of all antennas in array, i is the index value of snap.
Obtaining the detailed process without the output file under coupling is：
Step 1.2.1, the model of each antenna element is set up using FEKO softwares, and arrange parameter, parameter includes port institute
Connect matched load value, dielectric space residing for model is that vacuum, the electric current in output matching load, solving precision are double precision, entered
Penetrate scanning pitch range, the scan position angular region of incoming signal of signal；
Step 1.2.2, to each incoming signal, sets a fixed skew so that prolong in adjacent incoming signal phase
Slow same fixed skew；
Step 1.2.3, simulation calculating is carried out to j-th of antenna element model, often emulates once one out of outputijFile,
The outijComprising j-th of antenna element model snap signal in file, i is the index value of snap.
Step 2 is for the detailed process of the processing without the reception data under coupling：
Step 2.1, each out of FEKO output is obtainediAll reception data and English explanation in file；
Step 2.2, using Java programmings to each outiReception data in file are handled as follows：
Search each incident angle receive data on English " Segment loads ", after finding will it is following each
The reception signal real part of antenna element, imaginary part are taken out respectively according in the character field of this line, according to the angle of pitch from small to large,
The order of azimuth from small to large is deposited into corresponding txtiIn file.
It is for the detailed process for having the processing of the reception data under coupling in step 2：
Step 2.1, the reception data in the output file for all snaps for obtaining all antenna elements of FEKO output
With English explanation；
Step 2.2, using Java programmings to each outijReception data in file are handled as follows：
Search each incident angle receive data on English " Segment loads ", after finding will it is following each
The reception signal real part of antenna element, imaginary part are taken out respectively according in the character field of this line, according to the angle of pitch from small to large,
The order of azimuth from small to large is deposited into corresponding cache file；
Step 2.3, for the reception data in all cache files, the incident letter for the equal angular that i-th is taken soon
The reception data of all antenna elements under number according to the angle of pitch from small to large, azimuth it is suitable with the numbering of antenna from small to large
Sequence is deposited into corresponding txtiIn file.
The detailed process of step 3 is：
Step 3.1, by all txtiThe reception data of angle are all imported into Matlab in file, take out jth angle
All snap signals spent on all matched loads are as follows
Wherein, M is the port number of Model array, and N is the number of incoming signal；
Step 3.2, the weight w opt of i-th of angle formation null is obtained with LCMV algorithmsi；
Step 3.3,3.1,3.2 steps are repeated, the corresponding weight w opt of all incident angles is calculated.
The detailed process of step 4 is：
Step 4.1, using the weight w opt of i-th of incident angle formation nulliWith the reception data of each incident angle
Matrix multiple is carried out in Matlab and obtains reception intensity data result；
Step 4.2, it is that luffing angle, y-axis are that orientation angles, z-axis are to receive intensity data result to obtain three-dimensional according to x-axis
Scheme for representing the anti-interference reception directional diagram under i-th of incident angle；
Step 4.3, repeat step 4.1,4.2, obtain the anti-interference reception directional diagram in all incident angles.
The analysis method of step 5 is：As the corresponding weight w opt of some incident angle, in anti-interference reception directional diagram,
Reception gain is minimum, illustrates that now interference free performance is best.
Embodiment one
In order to realize to the incidence angle angle of pitch from 0 to 90 degree, azimuth is entered from 0 to the 360 angled reception signals of degree institute
Row crawl, simulation model is as shown in Figure 2.
The model that the emulation of the present embodiment is set up is 4 circle battle arrays, and spacing is 80mm.Fig. 3 and Fig. 4 are not having in emulating respectively
With having under coupling condition under coupling condition, incoming signal carrys out receiving pattern during to for (50,250).As can be seen that in interference
Come to (50,250) place, have the reception gain under coupling bigger than without the reception gain under coupling.
It is a kind of that the method that butt coupling receives characteristic influence is analyzed based on receiving pattern method, comprise the following steps：
Step 1, emulation Array Model, the stationary phase between arrange parameter and incoming signal are set up using FEKO softwares
Difference, is emulated to model, and acquisition is some to include the output file of snap signal, and the output file includes receiving data and English
Explanation；
Step 2, the reception data in each output file are handled using Java programmings, obtained only comprising reception
The file of data；
Step 3, the weights of all incident angle formation nulls are obtained using LCMV algorithms to the file of step 2；
Step 4, the anti-interference reception directional diagram under all incident angles is obtained based on weights；
Step 5, according to anti-interference reception Directional Pattern Analysis interference free performance.
In step 1, if acquisition has the reception data under coupling, model is set up according to the array layout of antenna.
In step 1, if obtain without reception data under coupling, according to the layout of array, foundation and antenna amount phase
Deng simulation model, the antenna element position only placed in each simulation model in an antenna element, each model is different, and
Corresponded with the layout under array, model is emulated, acquisition is some to include the output file of snap signal, output text
Part includes receiving data and English explanation.Assuming that array there are 4 antennas, there are 4 numberings, then in i-th of model, only i-th
Number antenna, and it is identical with the location of No. i-th antenna in array.
In step 1 obtain without couple under reception signal when, it is assumed that have 4 antennas in array, according to the cloth of array
Office, then needed when structuring the formation, and the list only placed in a unit, each model is set up in 4 models, each model file respectively
First position is different, and is corresponded with the layout under array, it is possible to respectively obtain the reception signal of each unit.
Step 1.1, the present invention disclosure satisfy that obtains to the reception signal of any formation.Here first set up in FEKO
Corresponding model.CADFEKO is opened, our arrays to be analyzed is built, matches port and meet matched load value ZL, array element
Residing dielectric space is vacuum.The reception signal under array is such as obtained, an array is set up when need to only model.Do not had
Coupling under reception signal when, it is assumed that have 4 antennas in array, according to the layout of array, then need, when structuring the formation, to set up respectively
A unit is only placed in 4 models, each model file, the cell position in each model is different, and with the cloth under array
Office corresponds, it is possible to respectively obtain the reception signal of each unit.
Step 1.2, the electricity in Solution → Current output in selection menu bar, setting output matching load
Stream, and be oriented to out as out files, settings solving precision is double precision；
Step 1.3, the scanning angle of incoming signal is set：Pitch range：0-90 degree, azimuth：0-360 degree, altogether
91 × 361=32851 angle.Often emulate once, the reception taken a soon signal output file can be obtained.In FEKO
Need to postpone 5 fixed skews in the phase of incoming signal, 6 different incoming signal phases are set altogether, you can respectively
Obtain comprising 6 out files, each out files contain the signal of 1 snap；
Step 1.4, the output file under not coupling is obtained, each file individually modeled need to only be emulated,
The parameter of setting is consistent with step 1.3, you can the reception signal for obtaining each passage omnibearing angel of totally 6 snaps is defeated
Go out file.Because each unit individually sets up model, 6 snap signals are taken altogether, so output file has 4*6=24.
Step 2, in the out files of FEKO output, each snap is a file, it is necessary to program inside taking-up
The signal of one snap of 32851 angles, the txt file that generation Matlab can be read.The signal of 6 snaps is taken out,
Need processing 6 times.
Step 2.1, in an out file of output, the reception signal of 32851 angles is contained.Have in out files
Data are received, also have English explanation, it is impossible to Matlab processing.Although in output file, the reception signal that we want is
Scattered arrangement, manually take out 32851 groups of data and just seem unrealistic；
Step 2.2, propose to carry out out files with Java programmings data search, cutting, unloading processing in invention：It is each
The reception signal upper row of individual incident angle can all have English, and " Segment loads ", will after this keyword is found
Below the reception signal real part of each passage, imaginary part according in this line which character field take out, according to the angle of pitch from 0 to
90 degree, azimuth is from the order of 0 to 360 degree is deposited into txt file；
Step 2.3,2.1-2.2 steps, the signal of all snaps of coprocessing are repeated；
Step 2.4, the 24 reception signal output files simulated are not coupled down, can also be with 2.1-2.4 steps
It is deposited into after reason in txt file, for following algorithm process data.
Step 3, the angled weights of institute are calculated with reception signal：Take out institute angled 4 road signal 6 snaps receive believe
Number, the corresponding weight w opt of each angle is calculated with LCMV algorithms.Here multiple snaps are taken primarily in matrix inversion,
Make matrix full rank, be not in the situation for can not seeking Chu Lai inverse matrix.
Step 3.1, the reception signal of 32851 angles of 6 snaps in step 2 is all imported into Matlab,
It is assumed here that there is 4 paths, the 6 snap signals taken out on all matched loads of some angle are as follows；
Step 3.2, this weight w opt in this angle formation null can be obtained with LCMV algorithms；
Step 3.3,3.1-3.2 steps are repeated, the angled interference of institute is calculated and comes to corresponding weights.
Step 4, receiving pattern during correspondence incident angle interference is obtained：With the corresponding weights of some angle calculated
The wopt signals that receive corresponding with each angle obtained in step 2 carry out matrix multiple in Matlab, obtained result
It can be equivalent to, when same day line back end algorithm adds weight w opt, the reception gain of antenna over all angles, i.e. antenna connect
Receive directional diagram.Contrast has coupling and without in the angled corresponding receiving pattern of institute coupled, analyzes butt coupling and receives battle array
For it is anti-interference when, the influence of performance.
Step 4.1, when it is angled on reception signal be all multiplied with the weight w opt of some in step 3 when, obtain
Result, be equivalent to receiving terminal plus this weight w opt when, to institute angled first-class width with phase receive signal reception characteristic；
Step 4.2, the result of the received signal strength after being multiplied with weights, according to the angle of pitch from 0 to 90 degree, azimuth from
The order of 0 to 360 degree, can be equivalent to the reception gain of each angle in the receiving pattern of current array.Obtained with calculating
Result, x-axis is angle of pitch 0-90 degree, and y-axis is azimuth 0-360 degree, and z-axis is calculates the obtained weighted value of each angle
Reception gain after wopt, when the 3-dimensional figure drawn can be equivalent to same day line back end algorithm plus weight w opt, array formation
Anti-interference reception directional diagram；
Step 4.3, all anti-interference reception directional diagrams for disturbing and coming to angle are obtained：Calculate in step 3 every
Weight w opt on individual interference radiating way, only need to carry out step 4.1-4.2 again, you can obtain it is all single-trunk disturb to when, array
The anti-interference reception directional diagram of formation.
Step 5, coupled from having and without in the angled corresponding receiving pattern of institute coupled, analyze butt coupling and receive
When battle array is used for anti-interference, the influence of performance.The standard of evaluation is：When the weights that the interference of some angle is calculated, direction is being received
In figure, reception gain is smaller, illustrates that now interference free performance is better.In addition it can also verify that coupling is estimated DOA with the method
The influence of precision.Also to easily verifying the improvement situation to antenna receptivity such as drop coupling measure.
Step 5.1, to having coupling and disturbing and to be formed in receiving pattern without several angles that extract respectively under coupling
Interference free performance is contrasted, and what influence analysis coupling has on interference free performance；
Step 5.2, obtained in step 2 without couple and have coupling under reception signal, can be imitated with DOA algorithms
Very, obtain coupling the influence to DOA estimated accuracies.
The change of the interference free performance after coupling measure can intuitively be verified plus dropped to method of the present invention：Improve battle array
Array structure, is modeled again, is repeated 1-5 steps, can be obtained the interference free performance of new array.
The model that the emulation of the present embodiment is set up is 4 circle battle arrays, and spacing is 80mm.Fig. 3 and Fig. 4 are not having in emulating respectively
With having under coupling condition under coupling condition, incoming signal carrys out receiving pattern during to for (50,250).As can be seen that in interference
Come to (50,250) place, have the reception gain under coupling bigger than without the reception gain under coupling.
It is concluded that being：Coupling do not have an impact the position of null in receiving pattern, and simply depth shallower (connects
Receive gain and become big), interference free performance is deteriorated.
In order to verify above-mentioned conclusion, limit as space is limited, provide the different incoming signals obtained by " receiving pattern method "
Under, null position and depth when not coupling and having a coupling.
Array element spacing 80mm result is given below：
Array element spacing 100mm result is given below：
Data can be drawn from the two tables, and the depth of only null is changed, and the null depth under coupling becomes
Shallow, i.e., the interference free performance in the case where there is coupling can be deteriorated.
The derivation of equation is given in addition to verify this conclusion：
In Fig. 5, the reception signal under not coupling is [S1,S2,S3,S4], when signal is transferred on front, because having
The presence of coupling, the signal that 4 antennas are received is changed into [S1',S2',S3',S4'].There are two weights in figure, be respectively：It is preferable
Receive the weight w opt, the weight w opt' of array received signal of signal.
In the case of for no coupling, there are wopt=μ RX -1a(θ0), (μ is a constant, can take 1；RXIt is to receive letter
Number covariance matrix；a(θ0) it is a constrained vector, can be with value [1,0,0,0] such as using first passage as reference channel)
Now, with ideal signal [S1,S2,S3,S4] be multiplied and power can be minimized.
In the case of having coupling, coupled signal is [S1',S2',S3',S4']T=C [S1,S2,S3,S4]T, (C is
The coupling matrix of current array), and the weights passed through after LCMV algorithm computings are：Wopt'=μ RX -1C-1a(θ0)。
At this moment,
wopt'·[S1',S2',S3',S4']T=μ RX -1C-1a(θ0)C·[S1,S2,S3,S4]T
≈μRX -1a(θ0)[S1,S2,S3,S4]T
=wopt [S1,S2,S3,S4]T
Wherein, footmark " T " represents the transposition of matrix, and " -1 " represents inverse of a matrix computing.
As can be seen that in the case where there is coupling, the signal [S of array received1',S2',S3',S4'], the weights calculated
Wopt', is still effectively suppressed interference.Simply algorithmically, the situation under not coupling can not be equivalent to, because
In above formula, there is a step to be about equal to.And also draw there is the anti-jamming effectiveness under coupling not as ideally by emulation
It is good.
The derivation of equation also demonstrates the conclusion in the simulation result in receiving pattern method：Coupling is no to change actual zero
Fall into position, change be null depth, i.e. interference free performance.
Claims (9)
1. a kind of analyze the method that butt coupling receives characteristic influence based on receiving pattern method, it is characterised in that including following step
Suddenly：
Step 1, emulation Array Model is set up using FEKO softwares, the fixed skew between arrange parameter and incoming signal is right
Model is emulated, and acquisition is some to include the output file of snap signal, and the output file includes receiving data and English explanation；
Step 2, the reception data in each output file are handled using Java programmings, obtained only comprising reception data
File；
Step 3, the weights of all incident angle formation nulls are obtained using LCMV algorithms to the file of step 2；
Step 4, the anti-interference reception directional diagram under all incident angles is obtained based on weights；
Step 5, the influence to interference free performance is coupled according to anti-interference reception Directional Pattern Analysis.
2. according to the method described in claim 1, it is characterised in that if obtained in step 1 without reception data under coupling
Model set up it is as follows：According to the layout of array, set up in the simulation model equal with antenna amount, each simulation model and only put
The antenna element position put in an antenna element, each model is different, and is corresponded with the layout under array.
3. according to the method described in claim 1, it is characterised in that step 1 obtains the output text for having the reception data under coupling
The detailed process of part is：
Step 1.1.1, emulation Array Model is set up using FEKO softwares, and arrange parameter, parameter connects matched load including port
Dielectric space residing for value, model is that vacuum, the electric current in output matching load, solving precision are that double precision, incoming signal are swept
Retouch the scan position angular region of pitch range, incoming signal；
Step 1.1.2, to each incoming signal, sets a fixed skew so that postpone in adjacent incoming signal phase same
One fixed skew；
Step 1.1.3, is emulated to model, often emulates once one out of outputiFile, the outiBattle array is contained in file
A snap signal of all antennas in row, i is the index value of snap.
4. method according to claim 2, it is characterised in that obtain the detailed process without the output file under coupling
For：
Step 1.2.1, sets up the model of each antenna element using FEKO softwares, arrange parameter, and parameter connects including port
It is that vacuum, the electric current in output matching load, solving precision are double precision, incident letter with dielectric space residing for load value, model
Number scanning pitch range, the scan position angular region of incoming signal；
Step 1.2.2, to each incoming signal, sets a fixed skew so that postpone in adjacent incoming signal phase same
One fixed skew；
Step 1.2.3, simulation calculating is carried out to j-th of antenna element model, often emulates once one out of outputijFile, it is described
outijComprising j-th of antenna element model snap signal in file, i is the index value of snap.
5. method according to claim 3, it is characterised in that step 2 is for the processing without the reception data under coupling
Detailed process be：
Step 2.1, each out of FEKO output is obtainediAll reception data and English explanation in file；
Step 2.2, using Java programmings to each outiReception data in file are handled as follows：
Search English " the Segment loads ", by following each antenna after finding in each incident angle reception data
The reception signal real part of unit, imaginary part are taken out respectively according in the character field of this line, according to the angle of pitch from small to large, orientation
The order of angle from small to large is deposited into corresponding txtiIn file.
6. method according to claim 4, it is characterised in that for there is the processing of the reception data under coupling in step 2
Detailed process be：
Step 2.1, reception data and English in the output file for all snaps for obtaining all antenna elements of FEKO output
Literary explanation；
Step 2.2, using Java programmings to each outijReception data in file are handled as follows：
Search English " the Segment loads ", by following each antenna after finding in each incident angle reception data
The reception signal real part of unit, imaginary part are taken out respectively according in the character field of this line, according to the angle of pitch from small to large, orientation
The order of angle from small to large is deposited into corresponding cache file；
Step 2.3, for the reception data in all cache files, under the incoming signal for the equal angular that i-th is taken soon
All antenna elements reception data according to the angle of pitch from small to large, order of the azimuth from small to large with the numbering of antenna deposit
Enter to corresponding txtiIn file.
7. the method according to claim 5 or 6, it is characterised in that the detailed process of step 3 is：
Step 3.1, by all txtiThe reception data of angle are all imported into Matlab in file, take out jth angle and own
All snap signals on matched load are as follows
Wherein, M is the port number of Model array, and N is the number of incoming signal；
Step 3.2, the weight w opt of i-th of angle formation null is obtained with LCMV algorithmsi；
Step 3.3,3.1,3.2 steps are repeated, the corresponding weight w opt of all incident angles is calculated.
8. method according to claim 7, it is characterised in that step 4 detailed process is：
Step 4.1, using the weight w opt of i-th of incident angle formation nulliExist with the reception data of each incident angle
Matrix multiple is carried out in Matlab and obtains reception intensity data result；
Step 4.2, it is that luffing angle, y-axis are that orientation angles, z-axis are to receive intensity data result and obtain graphics to use according to x-axis
Anti-interference reception directional diagram under i-th of incident angle of expression；
Step 4.3, repeat step 4.1,4.2, obtain the anti-interference reception directional diagram in all incident angles.
9. method according to claim 8, it is characterised in that the analysis method of step 5 is：When some incident angle correspondence
Weight w opt, in anti-interference reception directional diagram, reception gain is minimum, illustrates that now interference free performance is best.
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