CN103117781A - Method and device for antenna array calibration under complex electromagnetic environment - Google Patents

Abstract

The invention discloses a method and a device for antenna array calibration under complex electromagnetic environment. The device transmits calibration signals from a center point of an antenna array, and extracts array antennas and receives front-end amplitude inconsistency and phase inconsistency by means of wiener solution according to the principle of adaptive filter. The influence of small-amplitude same frequency interference or adjacent channel interference upon the result of frequency array calibration can be inhibited automatically in the complex electromagnetic environment with intense interference. When high-amplitude same frequency interference or adjacent channel interference has great influence on channel parameters, the extracted channel parameters can be processed to eliminate or greatly weaken the influence of the interference; received array signals are then subjected to broadband compensation or multiple narrowband compensation, and accordingly errors caused by channel inconsistency are eliminated. The method and device are applicable to real-time channel parameter extraction and automatic compensation for circular antenna arrays and receiving channels operating in any frequency range under the complex electromagnetic environment.

Description

Antenna array calibration method and device thereof under a kind of complex electromagnetic environment

Technical field

The present invention relates to the Array Signal Processing field, be specially antenna array calibration method and device thereof under a kind of complex electromagnetic environment.Complex electromagnetic environment refers to that there is the environment of intensive interference signal in the external world.Circular array refers to that antenna is evenly distributed on circumference.The present invention extracts and compensates circular array channel amplitude and phase place inconsistency error under complex electromagnetic environment.

Background technology

Develop rapidly along with communication theory and technology, array antenna has been played the part of more and more important role in the radio systems such as mobile communication, broadcasting station, radar system and navigation, and the quality of Array Signal Processing performance will directly affect the performance of whole communication system.Greatly reduce the performance of array acceptor system due to the inconsistency of each passage of array antenna, these parameters mainly comprise amplitude and the phase place of each reception antenna and receiver front end equipment, therefore, must adopt various technology and means to solve as much as possible the inconsistency of array antenna passage, each passage be carried out the calibration of amplitude inconsistency and phase place inconsistency.

At present, most of array calibration document is to the calibration in narrow band signal, or the calibration of carrying out under very little and interference signal amplitude circlet border in the external interference closeness, realizes that background is fairly simple." Sensor array calibration in the presence of mutual coupling and unknown sensor gains and phases " (C.M.S See, Electron Lett, 1994, 30 (5): 373-374) propose to send the calibration auxiliary signal, ask the covariance matrix of the array signal of reception, and associating Estimation of Spatial Spectrum, try to achieve channel amplitude inconsistency and phase place inconsistency, but this applied environment is restricted, external interference will be less and is faint, and in the situation that intensive external interference and interference signal are stronger, the method is just inapplicable.

Generally, the assisted calibration signal of transmission is all easy identification, and the simple signal that can not change of the waveform on frequency domain.Exactly because the intrinsic attribute of simple signal, the external interference pulse will affect the reception of this auxiliary signal to be differentiated, and affects the result of array calibration but simultaneously.Characteristics of the present invention are to solve existing array calibration method not consider external interference and can only be in the problem of arrowband internal calibration, Acquisition channel parameter (comprising channel amplitude inconsistency parameter and channel phases inconsistency parameter) accurately, and compensate in broadband.

Summary of the invention

The invention provides antenna array calibration method and device thereof under a kind of complex electromagnetic environment, the present invention can and exist under the complex electromagnetic environment of intensive interference in any frequency band range, automatically suppresses by a small margin same frequency or the impact of adjacent interference frequently on this frequency array calibration result.

Antenna array calibration method under a kind of complex electromagnetic environment provided by the invention comprises the following steps:

The 1st step sent calibrating signal;

The 2nd step utilized circular array to receive the calibrating signal that sends, and each road signal that receives is carried out analog-to-digital conversion, obtained the array digital signal;

The 3rd step was utilized the array digital signal that obtains, extract amplitude and the phase place of each passage, again with the amplitude of a certain passage and phase place as benchmark, ask the amplitude of other each passage and the relative value of phase place and benchmark, i.e. channel amplitude inconsistency and channel phases inconsistency;

The 4th step judge whether all frequencies are calibrated completely, if so, enter for the 5th step, otherwise, switch to next frequency, repeated for the 1st step to go on foot to the 3rd, until complete the extraction of the channel parameters of all frequencies;

The 5th step stopped sending calibrating signal;

The 6th step processed channel parameters, eliminated the impact of disturbing;

On the 7th step circular array, each reception antenna receives aerial signal, and each road signal that will receive carries out analog-to-digital conversion, obtains the array digital signal;

The 8th step compensated the array digital signal that obtains, and was compensated output signal.

Antennas array calibration arrangement under a kind of complex electromagnetic environment provided by the invention, it is characterized in that, this device comprises signal generator unit, circular antenna array element, array acceptor front end unit, array channel parameter extraction unit, channel parameters processing unit and channel compensation unit;

Described circular antenna array element is used for receiving signal and transmitting calibration signal, a calibrating signal transmitting antenna that is used for sending calibrating signal is placed at the center of circle battle array, also evenly place many reception antennas on the circumference of described circular array, distance between every adjacent reception antenna all equates, this reception antenna is extracting the array channel parameter stage, receives the calibrating signal that is mixed with external interference; In the compensated array signal phase, receive required array signal to be calibrated, described signal generator unit for generation of simple signal as the calibrating signal in the array calibration process;

Described array acceptor front end unit be used for to the signal that receives amplify, filtering, analog-to-digital conversion process, and offer described array channel parameter extraction unit;

The array signal that described array channel parameter extraction unit be used for to receive and the Wei Na solution form of reference signal according to sef-adapting filter carry out computing, extract channel parameters, and offer described channel parameters processing unit;

Process if described channel parameters processing unit is used for calibration frequency or adjacent place are frequently existed in strongly disturbing situation, and the data after processing offer the channel compensation unit; Somely disturb littlely, signal interference ratio is larger, does not process, and obtains final channel parameters;

Described channel compensation unit comprises broadband compensation unit and/or many narrow-band compensations unit, eliminates the array channel error that the signal that receives comprises.

The present invention can and exist under the complex electromagnetic environment of intensive interference in any frequency band range, automatically suppress by a small margin same frequency or the adjacent impact of frequently disturbing this frequency array calibration result, when if the Amplitude Ratio that disturbs is larger, can this frequency channel parameters of automatic rejection, and interpolation replaces it, obtain accurately final array channel parameter, and carry out many narrow-band compensations, perhaps disposable compensation in broad frequency range.Compare with other array calibration technology, the present invention has following characteristics:

(1) the present invention according to the principle of sef-adapting filter, uses Wei Na solution form to carry out the extraction of channel parameters, and operand is little, calculates simply, and easily realizes.

(2) can namely exist in the situation of intensive interference at complex electromagnetic environment, according to the interference magnitude size at calibration frequency or adjacent frequency place, channel parameters is processed.Avoided conventional array calibration method easily to be subjected to the impact of external interference.

(3) the array channel compensation can be carried out many narrow-band compensations or broadband compensation, and broadband compensation is the structure calibration filters, realizes the disposable compensation in required frequency band; Many narrow-band compensations are the signal channellizations that will receive, and are divided into a plurality of arrowbands, then compensate in each arrowband.Having avoided the compensation of conventional array channel to require the signal of compensation to be calibrated is signal in the arrowband.

(4) apparatus of the present invention can be based upon on the basis of any band limits, have avoided the general array calibration can only be in the arrowband scope, and disturb in the situation of wanting smaller just feasible in this frequency range.

Description of drawings

Fig. 1 is the method flow schematic diagram of example of the present invention;

Fig. 2 is channel parameters extracting method block diagram;

Fig. 3 is channel parameters processing method block diagram;

Fig. 4 is broadband compensation method block diagram;

Fig. 5 is many narrow-band compensations method block diagram;

Fig. 6 is the apparatus structure schematic diagram of example of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.Need to prove at this, understand the present invention for the explanation of these execution modes for helping, but do not consist of limitation of the invention.In addition, below in each execution mode of described the present invention involved technical characterictic just can mutually not make up as long as consist of each other conflict.

As shown in Figure 1, the array calibration method that example of the present invention provides comprises the following steps:

(1) send calibrating signal

Signal generator, is sent by the calibrating signal transmitting antenna through after digital-to-analogue conversion according to the parameter generating simple signal of the calibrating signal of waiting to send out.The parameter of calibrating signal comprises type, amplitude and the frequency etc. of signal.

(2) data acquisition

After sending calibrating signal, utilize circular array to receive each road signal, obtain digital signal after analog-to-digital conversion, the passage ginseng that is used for the back is extracted calculating.

(3) carry out the channel parameters extraction algorithm

Each railway digital signal that utilization obtains carries out computing, extract amplitude and the phase place of each passage, again with the amplitude of a certain passage and phase place as benchmark, ask the amplitude of other each passage and the relative value of phase place and benchmark, i.e. channel amplitude inconsistency and channel phases inconsistency.As shown in Figure 3, concrete steps are as follows:

(3.1) each reception antenna of circular array receives the calibrating signal that sends from the calibrating signal transmitting antenna, and the interference signals such as air broadcast radio station, air communications, and it is s that the signal that i reception antenna receives passes through the analog-to-digital conversion postscript _i(n), n is the sequence number of sampled point.

(3.2) produce single-frequency sequence cos2 π fn with the identical frequency of calibrating signal, as reference signal 1, and sin2 π fn, as reference signal 2, the calibration signal frequency of f for launching.

(3.3) according to the signal of reference signal and reception, carry out related operation, extract channel parameters, specific as follows described:

Supposing to be positioned at the calibrating signal that the calibrating signal transmitting antenna of circular array center launches is cos2 π ft, and t is the time of emission.I reception antenna receives this calibrating signal and after amplification, filtering and analog-to-digital conversion, its output signal is

A _iFor the amplitude of this passage output signal,

Be the phase shift of this passage output signal, they have reflected the amplitude of this receive path introducing and the inconsistency of phase place indirectly, and its value can based on the lowest mean square criterion, with the Wei Na solution form of sef-adapting filter, namely be calculated in the steps below:

Calculate the ASSOCIATE STATISTICS amount w of this passage _opt:

$w_{\mathrm{opt}}=\left[\begin{array}{c}{I}_i\\ Q_i\end{array}\right]=\frac{2}{N}\left[\begin{array}{c}\underset{n=1}{\overset{N}{\mathrm{\Σ}}}\left\{s_i\left(n\right)\cos 2\mathrm{\πfn}\right\}\\ -\underset{n=1}{\overset{N}{\mathrm{\Σ}}}\{s_i\left(n\right)\sin 2\mathrm{\πfn}\end{array}\right]$

In following formula, f is the frequency of the calibrating signal of launching, and N is for being used for calculating ASSOCIATE STATISTICS amount w _optTotal number of sample points, obtain weights I _iAnd Q _i, and utilize following formula to calculate the amplitude A of i passage _i, phase place

$A_i=\sqrt{I_i^2+Q_i^2},$

(3.4) according to A _iWith

Ask for the amplitude of each passage and the relative value of phase place and benchmark, i.e. the amplitude inconsistency of passage and phase place inconsistency are as channel parameters.Can be with amplitude and the phase parameter A of first passage ₁,

As benchmark, ask for the amplitude of each passage and the deviation of phase place and this benchmark, obtain channel amplitude inconsistency parameter A _i'=A _i/ A ₁With phase place inconsistency parameter

Wherein, i is channel position, and 1≤i≤P, P are the array received total number of channels.

(4) the judgement frequency has been calibrated no

The present invention is applicable in any frequency range, if need to ask the channel parameters in the broad frequency band scope, need send the calibrating signal of a plurality of frequencies.After sending the calibrating signal of first frequency and extracting the channel parameters of this frequency, the judgement frequency has been calibrated no, do not calibrated when frequency and switched to next frequency, repeated (1)～(3) step, until complete the extraction of the channel parameters of all frequencies.

(5) stop sending calibrating signal

After the channel parameters extraction was complete, each reception antenna did not need to receive calibrating signal, therefore, stop sending calibrating signal, and the shutdown signal generator makes the calibrating signal transmitting antenna no longer send calibrating signal.

(6) treatment channel parameter

The present invention processes channel parameters, eliminates the impact of disturbing, and processing procedure as shown in Figure 4.The concrete processing procedure of this step is:

(6.1) suppose that a plurality of calibration frequencies that arrange are f in the working frequency range of required calibration _k, k=1,2 ..., K, the calibration frequency total number of K for arranging, the channel amplitude relative value of extracting at each calibration frequency is A ' _{I, k}, and the phase place relative value is

I is channel position.If at this calibration frequency place or the adjacent frequency place external interference is arranged, but interference magnitude is smaller, the channel parameters at this frequency place directly is taken as A ' _{I, k}With

If the external interference Amplitude Ratio is larger, need to process.

Example of the present invention is according to resulting phase place-frequency curve The burr situation determine whether to process the channel parameters at this frequency place.Wherein, A ' _{I, k}With

The amplitude, the phase place inconsistency parameter that represent i passage, k frequency place.

At phase place-frequency curve

In, judge and process the method for burr point: a threshold value T is set, when

And Judge this frequency place Be burr, at this moment with the channel amplitude relative value A ' at this frequency place _{I, k}With the phase place relative value

Deletion.T is by adjacent calibration frequency interval, passage length, and signaling rate determines, because

The unit of T is degree, and Δ f is the difference on the frequency of two calibrating signals, and c is the transmission speed of signal, and l is the length of passage.

(6.2) at the deleted enterprising row interpolation of frequency of channel parameters, replace deleted channel parameters with interpolation result, as the channel parameters at this frequency place.

Concrete interpolation method can be the methods such as three rank polynomial interopolations, with the phase place-frequency curve after the assurance interpolation

Level and smooth in whole working frequency range.Can also double according to demand or many times of interpolation on the basis of calibrated frequency points, namely increase the total number K of calibration frequency, obtain channel parameters corresponding to more intensive frequency.

(6.3) repeating step (6.1)～(6.2) obtain the channel parameters after all passages are processed.

(7) data acquisition

On circular array, each reception antenna receives required aerial signal, each road signal of synchronous acquisition.

(8) channel compensation

Channel compensation has broadband compensation method and many narrow-band compensations method.

The broadband compensation process the invention provides the method that the signal that each passage is received carries out amplitude and phase compensation in broadband as shown in Figure 5, and concrete steps are as follows:

(a1), the structural wideband compensating filter, according to the symmetry of FIR filter parameter, the channel parameters A ' that each calibration frequency place of i paths is obtained _{I, k}With

Frequency domain response H as the broadband compensation filter _i(f) parameter on positive frequency band is with A ' _{J, k}With

As H _i(f) parameter on negative frequency band, then to H _i(f) carry out Fourier inversion, can obtain the time domain impulse response h of broadband compensation filter _i(n).

(a2), the signal x to be calibrated that the i passage is received _i(n) enter in digital compensation filter, with the time domain impulse response h of broadband compensation filter _i(n) carry out convolution, that is:

$S_i^{\′}=h_i\left(n\right)\⊗x_i\left(n\right)$

s′ _{I (n)}For through the signal after the i channel compensation.

(a3), repeating step (a1)～(a2), obtain the reception signal after all channel compensations.

But the present invention also signal that receives of each passage carries out many narrow-band compensations, process as shown in Figure 6, concrete steps are as follows:

(b1), the wideband digital signal x that the i passage is received _i(n), process through channelizing, namely dedicated bandwidth is that Δ f, centre frequency are respectively f _mSeveral band pass filters to the reception signal x of Whole frequency band _i(n) carry out filtering, obtain the channelizing output signal:

$y_{i,m}\left(n\right)=x_i\left(n\right)\⊗g_{i,m}\left(n\right)$

g _{I, m}(n) be the impulse response of m channel band-pass filter of i passage, m=1,2 ..., M, M are the channel number.

After processing by channelizing, with wideband received signal x _i(n) become a plurality of arrowband complex signal y _{I, m}(n) (channelizing signal).

(b2), according to channel parameters, structure i passage, the interior compensating factor r of a m channel _{I, m}:

J is empty unit, and e is the truth of a matter of natural logrithm, A ' _{I, m}Be the amplitude inconsistency parameter in i passage, a m channel,

It is the phase place inconsistency parameter in i passage, a m channel.

(b3), the channel parameters in i passage, a m channel is compensated in the arrowband complex signal of respective channels, obtain the compensation output signal s at this passage, this channel place " _{I, m}(n):

s″ _i，m(n)＝r _i，my _i，m(n)

The reception signal that utilizes following formula to obtain this passage is positioned at the compensation output signal at all narrow band channels place.

(b4), repeat (b1)～(b3), try to achieve all passages in the compensation output signal at each narrow band channel place.

The present invention is based on circular antenna array, existing under the complex electromagnetic environment of intensive interference, to the calibration of each passage.A calibrating signal transmitting antenna 10 that is used for sending calibrating signal is placed at the circular array center, and the simple signal of signal generator unit 11 generations is as the calibrating signal in the array calibration process.Evenly place P root reception antenna 12 on circular array, extracting the array channel parameter stage, receive the calibrating signal that is mixed with external interference; In the compensated array signal phase, receive the array signal of required calibration.

Array calibration device of the present invention as shown in Figure 1, array acceptor front end 13 can comprise the modules such as amplification, filtering, frequency conversion, analog-to-digital conversion.14 li of array channel parameter extraction unit, the array signal of reception and reference signal are separated form according to the Wei Na of sef-adapting filter, carry out related operation, extract channel parameters.If channel parameters processing unit 15 is calibration frequency or adjacent place frequently to be existed in strongly disturbing situation process, somely to disturb littlely, signal interference ratio is larger, does not process, and obtains final channel parameters.Channel compensation unit 16 comprises broadband compensation unit 160 and many narrow-band compensations unit 161, i.e. the array channel error that the signal that receives comprises is eliminated in two kinds of compensation methodes.

The above is preferred embodiment of the present invention, but the present invention should not be confined to the disclosed content of this embodiment and accompanying drawing.So everyly do not break away from the equivalence of completing under spirit disclosed in this invention or revise, all falling into the scope of protection of the invention.

Claims (9)

1. the antenna array calibration method under a complex electromagnetic environment comprises the following steps:

The 1st step sent calibrating signal;

The 2nd step utilized circular array to receive the calibrating signal that sends, and each road signal that receives is carried out analog-to-digital conversion, obtained the array digital signal;

The 3rd step was utilized the array digital signal that obtains, extract amplitude and the phase place of each passage, again with the amplitude of a certain passage and phase place as benchmark, ask the amplitude of other each passage and the relative value of phase place and benchmark, i.e. channel amplitude inconsistency and channel phases inconsistency;

The 4th step judge whether all frequencies are calibrated completely, if so, enter for the 5th step, otherwise, switch to next frequency, repeated for the 1st step to go on foot to the 3rd, until complete the extraction of the channel parameters of all frequencies;

The 5th step stopped sending calibrating signal;

The 6th step processed channel parameters, eliminated the impact of disturbing;

On the 7th step circular array, each reception antenna receives aerial signal, and each road signal that will receive carries out analog-to-digital conversion, obtains the array digital signal;

The 8th step compensated the array digital signal that obtains, and was compensated output signal.

2. antenna array calibration method according to claim 1, is characterized in that, the 3rd step specifically comprised following process:

(3.1) each reception antenna of circular array receives the calibrating signal that sends from the calibrating signal transmitting antenna, and interference signal, and the signal of i reception antenna reception is s through the analog-to-digital conversion postscript _i(n), n is the sequence number of sampled point;

(3.2) produce single-frequency sequence cos2 π fn with the identical frequency of calibrating signal, as reference signal 1, and sin2 π fn, as reference signal 2, the calibration signal frequency of f for launching;

(3.3) according to the signal of reference signal and reception, carry out related operation, extract channel parameters, comprise amplitude A _i, phase place

(3.4) with the amplitude of one of them passage and phase parameter as benchmark, ask for the amplitude of each passage and the deviation of phase value and this benchmark, obtain channel amplitude inconsistency parameter and phase place inconsistency parameter.

3. antenna array calibration method according to claim 2, it is characterized in that, the 3rd step comprised following process: step (3.3) is: supposing to be positioned at the calibrating signal that the calibrating signal transmitting antenna of circular array center launches is cos2 π ft, t is the time of emission, i reception antenna receives this calibrating signal and after amplification, filtering and analog-to-digital conversion, its output signal is

A _iBe i passage output signal amplitude,

Be the phase shift of this passage output signal, calculate the ASSOCIATE STATISTICS amount w of this passage _opt:

$w_{\mathrm{opt}}=\left[\begin{array}{c}{I}_i\\ Q_i\end{array}\right]=\frac{2}{N}\left[\begin{array}{c}\underset{n=1}{\overset{N}{\mathrm{\Σ}}}\left\{s_i\left(n\right)\cos 2\mathrm{\πfn}\right\}\\ -\underset{n=1}{\overset{N}{\mathrm{\Σ}}}\left\{s_i\left(n\right)\sin 2\mathrm{\πfn}\right\}\end{array}\right]$

In following formula, f is the frequency of the calibrating signal of launching, and N is for being used for calculating ASSOCIATE STATISTICS amount w _optTotal number of sample points, obtain weights I _iAnd Q _i, and utilize

Calculate the amplitude A of i passage _i, phase place

4. according to claim 1,2 or 3 described antenna array calibration methods, is characterized in that, the 6th step specifically comprised following process:

Suppose that a plurality of calibration frequencies that arrange are f in the working frequency range of required calibration _k, k=1,2 ..., K, the calibration frequency total number of K for arranging, the channel amplitude relative value of extracting at each calibration frequency is A ' _i,k, and the phase place relative value is I is channel position; If at certain calibration frequency place or adjacent frequency place, external interference is arranged, but interference magnitude is smaller, the channel parameters at this frequency place directly is taken as A ' _i,kWith

Otherwise, to reject the channel parameters of this frequency, then carry out interpolation processing, the channel parameters before replacing is eliminated the impact of disturbing.

5. antenna array calibration method according to claim 4, is characterized in that, the 6th the step according to resulting phase place-frequency curve

The burr situation determine whether to process the channel parameters at this frequency place.

6. antenna array calibration method according to claim 5, is characterized in that, at phase place-frequency curve

In, judge and process the method for burr point:

(6.1) when And

Judge this frequency place

Be burr, at this moment with the channel amplitude relative value A ' at this frequency place _{I, k}With the phase place relative value Deletion, wherein, T is predefined threshold value;

(6.2) at the deleted enterprising row interpolation of frequency of channel parameters, replace deleted channel parameters with interpolation result, as the channel parameters at this frequency place;

(6.3) repeating step (6.1) ~ (6.2) obtain the channel parameters after all passages are processed.

7. arbitrary described linear array calibration steps according to claim 1 to 6, is characterized in that, the 8th step was carried out broadband compensation according to following process:

(a1), the structural wideband compensating filter, according to the symmetry of FIR filter parameter, the channel parameters A ' that each calibration frequency place of i paths is obtained _i,kWith

Frequency domain response H as the broadband compensation filter _i(f) parameter on positive frequency band is with A ' _i,kWith

As H _i(f) parameter on negative frequency band, then to H _i(f) carry out Fourier inversion, namely obtain the time domain impulse response h of broadband compensation filter _i(n);

(a2), the signal x to be calibrated that the i passage is received _i(n) enter in digital compensation filter, with the time domain impulse response h of broadband compensation filter _i(n) carry out convolution, that is:

$s_i^{\′}\left(n\right)=h_i\left(n\right)\⊗x_i\left(n\right)$

s′ _{I (n)}For through the signal after the i channel compensation;

(a3), repeating step (a1) ~ (a2), obtain the reception signal after all channel compensations.

8. arbitrary described antenna array calibration method in 6 according to claim 1, is characterized in that, the 8th step was carried out many narrow-band compensations according to following process:

(b1), the signal x to be calibrated that the i passage is received _i(n), process through channelizing, obtain the channelizing output signal:

$y_{i,m}\left(n\right)=x_i\left(n\right)\⊗g_{i,m}\left(n\right)$

g _{I, m}(n) be the impulse response of m channel band-pass filter of i passage, m=1,2 ..., M, M are the channel number,

After processing by channelizing, with wideband received signal x _i(n) become a plurality of arrowband complex signal y _i,m(n);

(b2), according to channel parameters, structure i passage, the interior compensating factor r of a m channel _i,m:

J is empty unit, and e is the truth of a matter of natural logrithm, A ' _{I, m}Be the amplitude inconsistency parameter in i passage, a m channel,

It is the phase place inconsistency parameter in i passage, a m channel;

(b3), the channel parameters in i passage, a m channel is compensated in the arrowband complex signal of respective channels, obtain the compensation output signal s at this passage, this channel place " _{I, m}(n):

s″ _i，m(n)=r _i,my _i,m(n)

The reception signal that utilizes following formula to obtain this passage is positioned at the compensation output signal at all narrow band channels place;

(b4), repeat (b1) ~ (b3), try to achieve all passages in the compensation output signal at each narrow band channel place.

9. the antennas array calibration arrangement under a complex electromagnetic environment, it is characterized in that, this device comprises signal generator unit, circular antenna array element, array acceptor front end unit, array channel parameter extraction unit, channel parameters processing unit and channel compensation unit;

Described circular antenna array element is used for receiving signal and transmitting calibration signal, a calibrating signal transmitting antenna that is used for sending calibrating signal is placed at the center of circle battle array, evenly place many reception antennas on the circumference of circular array, distance between every adjacent reception antenna all equates, this reception antenna is used for being mixed with in the array channel parameter stage reception of extraction the calibrating signal of external interference, in the compensated array signal phase, receive required array signal to be calibrated; Described signal generator unit for generation of simple signal as the calibrating signal in the array calibration process;

Described array acceptor front end unit be used for to the signal that receives amplify, filtering, analog-to-digital conversion process, and offer described array channel parameter extraction unit;

Described array channel parameter extraction unit is used for the array signal and the Wei Na solution form of reference signal according to sef-adapting filter that will receive, and carries out computing, extracts channel parameters, and offers described channel parameters processing unit;

Process if described channel parameters processing unit is used for calibration frequency or adjacent place are frequently existed in strongly disturbing situation, and the data after processing offer the channel compensation unit; Somely disturb littlely, signal interference ratio is larger, does not process, and obtains final channel parameters;

Described channel compensation unit comprises broadband compensation unit and/or many narrow-band compensations unit, eliminates the array channel error that the signal that receives comprises.

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