CN107561502A - A kind of portable high frequency groundwave radar Radio frequency interference suppressing method - Google Patents
A kind of portable high frequency groundwave radar Radio frequency interference suppressing method Download PDFInfo
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Abstract
The present invention relates to gate stealing field, more particularly to a kind of portable high frequency groundwave radar Radio frequency interference suppressing method, high-frequency ground wave radar receiver is using two monopole crossed loops as reception antenna, after passage is calibrated, the monopole subchannel in two monopole crossed loops, respective two crossed loops passages are carried out Radio frequency interference respectively.AF panel is realized using the method for spatial domain subspace projection, thresholding is set first, judges whether each frame contains Radio frequency interference；For the frame period of Radio frequency interference be present, using the signal acquisition Radio frequency interference sample containing only noisy remote member, the subspace of Radio frequency interference is extracted by Eigenvalues Decomposition, for closely first signal containing Radio frequency interference and extra large state information, the orthogonal subspaces for projecting to interference space realizes the suppression of interference.There is good inhibition for dense Radio frequency interference, and can ensure that the angle of arrival result that MUSIC algorithms estimation monopole intersects loop antenna after AF panel is reliable.
Description
Technical field
The invention belongs to gate stealing field, more particularly to a kind of portable high frequency groundwave radar Radio frequency interference to suppress
Method.
Background technology
High-frequency ground wave radar is widely used in the inverting of the ocean surface parameters such as flow field, the high spectrum of wave, wind information, can be real-time
Useful extra large state information is provided in large area marine site.It is portable since CODAR companies propose monopole crossed loops reception antenna
Formula high-frequency ground wave radar is widely used.But because substantial amounts of HF radio set shares high-frequency band so that
High-frequency ground wave radar is faced with critically important Radio frequency interference problem.High band Radio frequency interference is very frequent, often covers useful
Echo-signal, including extra large state and hard goal, therefore, before useful information is extracted, it is to have very much that suppression is carried out to Radio frequency interference
It is necessary.Domestic and international expert proposes many useful Radio frequency interference suppressing methods based on large-scale array, such as adaptive ripple
Beam formation, polarization filtering, sidelobe cancellation etc., and achieve good inhibition.But due to portable high frequency groundwave thunder
It is wider up to wave beam, and lack polarization information, these methods all will failure.Meanwhile in monopole intersects loop system, due to ripple
Beam is very wide, and radar has higher probability to receive interference.It is therefore proposed that a kind of (such as intersected for widebeam radar with monopole
Portable high frequency groundwave radar of the loop antenna as reception antenna) effective Radio frequency interference suppressing method is extremely urgent.
The content of the invention
The purpose of the present invention is to propose to a kind of signal transacting side that Radio frequency interference elimination is realized using spatial domain subspace projection
Method, it is the high-frequency ground wave radar Radio frequency interference suppressing method for the measurement accuracy that can improve data user rate and extra large state.
To achieve the above object, the technical solution adopted by the present invention is：A kind of portable high frequency groundwave radar Radio frequency interference
Suppressing method, high-frequency ground wave radar is using two monopole crossed loops as reception antenna；Each monopole intersects loop antenna bag
Include a monopole antenna and two intersection loop antennas；Radio frequency interference suppressing method comprises the following steps：
Step 1, two monopoles are intersected with loop antenna progress passage calibration；
Step 2, in each frequency sweep cycle, Radio frequency interference is identified；
Step 3, in the frame period that interference be present, first, the monopole antenna that two monopoles are intersected with loop antenna leads to
Road, the data matrix of interference is built using the data of remote member；Then the covariance matrix of interference is calculated；
Step 4, for the covariance matrix of interference, using the method for feature decomposition, take feature corresponding to big characteristic value to
Measure the subspace as interference；
Step 5, nearly the data projection of distance element is closely first to above the orthogonal subspaces of interference space, realizing
AF panel；
Step 6, the respective two crossed loops antenna channels repeat step 3~5 of loop antenna is intersected in fact for two monopoles
Existing AF panel.
In above-mentioned portable high frequency groundwave radar Radio frequency interference suppressing method, the specific implementation of step 1 includes：
Step 1.1 intersects the respective internal calibrations of loop antenna for two monopoles, using respective monopole antenna passage as
With reference to, the calibration value of the respective two crossed loops antenna channels of calculating, and by the passage compensation for calibrating errors being calculated to each
Two crossed loops antenna channels data inside；
Step 1.2 intersects the calibration between loop antenna for two monopoles, is calibrated using the echo of ship, screens
Go out positioned at the upward ship return signal of Array Method, on the basis of one of monopole intersects loop antenna, count another
Monopole intersects the amplitude and phase difference of loop antenna, and will count obtained amplitude and phase difference compensation to monopole to be calibrated
Son intersects inside the data of loop antenna.
In above-mentioned portable high frequency groundwave radar Radio frequency interference suppressing method, the realization of step 2 includes：For each
1024 frame frequency sweep cycles of field data, using more than some performance number of bottom of making an uproar as thresholding, if two monopole crossed loops
There are 3 passages to recognize Radio frequency interference inside 6 passages of antenna, then it is assumed that this frame data has Radio frequency interference.
In above-mentioned portable high frequency groundwave radar Radio frequency interference suppressing method, bottom of making an uproar is according in the absence of Radio frequency interference
Data are tried to achieve, and choose cleaner output play first, then calculate the 60th~120 distance element on two monopole subchannels
The average of upper doppler spectral noise power, obtain noise power；The empirical value of thresholding takes 8dB.
In above-mentioned portable high frequency groundwave radar Radio frequency interference suppressing method, the data matrix described in step 3 is one
The data of 61st~120 distance element on individual 60*2 matrix, including two monopole subchannels.
The beneficial effects of the invention are as follows：Because disturbance restraining method of the present invention establishes subspace in a frequency sweep cycle,
It is considered that interference is all single-frequency so that the correlation of signal distance dimension is stronger, ensure that good inhibition.Meanwhile
It is different from the direction of signal because Radio frequency interference is typically from continent, therefore disturbance restraining method of the present invention is to effective echo
Decay it is smaller.Monopole subchannel, two crossed loops days of the disturbance restraining method of the present invention in two monopole crossed loops
Line passage is carried out respectively, and the ratio of the decay for signal is the same, thus do not interfere with suppression after in monopole crossed loops
Internal angle-of- arrival estimation.There is good inhibition for dense Radio frequency interference.
Brief description of the drawings
Fig. 1 is the algorithm flow chart of one embodiment of the invention；
Fig. 2 is the reception antenna schematic diagram of one embodiment of the invention high-frequency ground wave radar；
Fig. 3 is the data structure schematic diagram that one embodiment of the invention high-frequency ground wave radar receives.
Embodiment
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
The present embodiment realizes that a kind of portable high frequency groundwave radar Radio frequency interference suppresses using following technical scheme
Method, high-frequency ground wave radar is using two monopole crossed loops as reception antenna；Each monopole, which intersects loop antenna, includes one
Individual monopole antenna and two intersection loop antennas；Radio frequency interference suppressing method comprises the following steps：
Step 1, two monopoles are intersected with loop antenna progress passage calibration；
Step 2, in each frequency sweep cycle, Radio frequency interference is identified；
Step 3, in the frame period that interference be present, first, the monopole antenna that two monopoles are intersected with loop antenna leads to
Road, the data matrix of interference is built using the data of remote member；Then the covariance matrix of interference is calculated；
Step 4, for the covariance matrix of interference, using the method for feature decomposition, take feature corresponding to big characteristic value to
Measure the subspace as interference；
Step 5, nearly the data projection of distance element is closely first to above the orthogonal subspaces of interference space, realizing
AF panel；
Step 6, the respective two crossed loops antenna channels repeat step 3~5 of loop antenna is intersected in fact for two monopoles
Existing AF panel.
Further, the specific implementation of step 1 includes：
Step 1.1 intersects the respective internal calibrations of loop antenna for two monopoles, using respective monopole antenna passage as
With reference to, the calibration value of the respective two crossed loops antenna channels of calculating, and by the passage compensation for calibrating errors being calculated to each
Two crossed loops antenna channels data inside；
Step 1.2 intersects the calibration between loop antenna for two monopoles, is calibrated using the echo of ship, screens
Go out positioned at the upward ship return signal of Array Method, on the basis of one of monopole intersects loop antenna, count another
Monopole intersects the amplitude and phase difference of loop antenna, and will count obtained amplitude and phase difference compensation to monopole to be calibrated
Son intersects inside the data of loop antenna.
Further, the realization of step 2 includes：For 1024 frame frequency sweep cycles of each field data, using more than bottom of making an uproar
One performance number is penetrated as thresholding if having 3 passages to recognize inside 6 passages of two monopoles intersection loop antennas
Frequency disturbs, then it is assumed that this frame data has Radio frequency interference.
Further, bottom of making an uproar is tried to achieve according in the absence of the data of Radio frequency interference, chooses cleaner output play first, so
The average of doppler spectral noise power in the 60th~120 distance element on two monopole subchannels is calculated afterwards, obtains noise power；
The empirical value of thresholding takes 8dB.
Further, the data matrix described in step 3 is 60*2 matrix, including the 61st on two monopole subchannels
The data of~120 distance elements.
In the specific implementation, a kind of portable high frequency groundwave radar Radio frequency interference suppressing method, high-frequency ground wave radar
The uniform linear array that OSMAR-SD reception antenna is made up of two monopole crossed loops antennas.Two monopole crossed loops days
Line forms by three antennas：Respectively monopole antenna 1 and intersection loop antenna A1 and intersection loop antenna B1；Monopole antenna 2
With intersection loop antenna A2 and intersection loop antenna B2；Spacing λ/2 between two antennas are wavelength corresponding to radar operating frequency
Half.As shown in Figure 2.
As shown in figure 1, disturbance restraining method comprises the following steps；
S1, two monopole crossed loops are entered with row of channels calibration.
S2, in each frequency sweep cycle, identify Radio frequency interference.
S3, in the frame period that interference be present, first, to the monopole subchannel of two monopole crossed loops, using long distance
From the data matrix of the data structure interference of member.Then the covariance matrix of interference is calculated.
S4, for the covariance matrix of interference, using the method for feature decomposition, characteristic vector corresponding to big characteristic value is taken to make
For the subspace of interference.
S5, nearly distance element data projection are closely first dry to above the orthogonal subspaces of interference space, realizing
Disturb suppression.
S6, the data of ring A and ring channel B for two monopole crossed loops, using the step as monopole subchannel
Suddenly, i.e., S3~S5 realizes AF panel.
Moreover, the channel calibration method described in S1, by the way of passive calibration, extracts calibration directly from marine echo
Value.For two respective internal calibrations of monopole crossed loops, using respective monopole subchannel as reference, respective crossed loops is calculated
The passage calibration value of antenna, and by the data of the passage compensation for calibrating errors being calculated to respective crossed loops antenna channels
Face.For the calibration between two monopole crossed loops, calibrated, filtered out upward positioned at Array Method using the echo of ship
Ship return signal, on the basis of one of monopole crossed loops, count another monopole crossed loops amplitude and
Phase difference, and obtained amplitude and phase difference compensation will be counted to the data the inside of monopole intersection loop antenna to be calibrated.
Moreover, the identification Radio frequency interference method described in S2, for 1024 frame frequency sweep cycles of each field data, using more than
Some performance number of bottom of making an uproar is as thresholding, if two monopole crossed loops have 3 passages to recognize inside totally six passages
Radio frequency interference, that is, think that this frame data has Radio frequency interference.The bottom of making an uproar, is asked according to the data in the absence of Radio frequency interference
, cleaner output play is chosen first, is then calculated how general in the 60th~120 distance element on two monopole subchannels
The average of spectral noise power is strangled, obtains noise power.Described thresholding, it is an empirical value, typically takes 8dB.
60*2 matrix moreover, the data matrix described in S3, be by the 61st on two monopole antenna passages~
The data composition of 120 distance elements.
The Radio frequency interference restrainable algorithms that the present embodiment is related to are divided into two parts；
(1) theory deduction of the Radio frequency interference restrainable algorithms based on projection
Ideally, if S is by orthocomplemented space S each other1And S2Linear combination, S1And S2The orthonormal basis in space
Respectively C1And C2.Then have：
S1=P1S,S2=P2S=(I-P) S=(S-P1)S
Wherein, I is unit matrix, P1And P2Respectively S to S1And S2Projection operator, P1It can be expressed as：
The data matrix that if S, which is high-frequency ground wave radar, to be collected, S1It is interference matrix, S2It is echo matrix, by S to S1
Projection matrix orthogonal complement matrix on project, can be by S2Separated from S, that is, realize that Radio frequency interference suppresses.
As shown in figure 3, the data that OSMAR-SD is received, 6 passages, each passage have the frame of coherent accumulation 1024 altogether altogether
Data, it is 128 that maximum, which retains distance element, corresponding 320km.But generally, extra large state and target echo scope are at 60
Within distance element, corresponding 150km, and the echo of farther place is free from extra large state and target information, and only done containing radio frequency
Disturb.Therefore 61~120 distance elements can be used for estimating interference space.
In order to estimate spatial domain subspace, data sample leads in two monopole subchannels and respective two crossed loops respectively
Selected between road.Such as Fig. 3, by taking monopole subchannel as an example, when suppressing the interference of monopole subchannel, in the cycle containing Radio frequency interference
It is interior, see the data block part selected in Fig. 3.Select the data in the 61st~120 distance element of two monopoles, structure interference
Matrix：
Sfar=ArSr+N
ArFor interference matrix SrSteering vector, N is noise matrix；
In identical frequency sweep cycle, the data in 60 distance elements can be expressed as：
Snear=AsSs+ArSr+N
AsFor signal matrix SsSteering vector.
By to SfarFeature decomposition is carried out, takes the eigenvalue λ of maximum1Corresponding unit character vector ν1It is empty as interference
Between estimator, i.e.,
Because estimated projection operator
I.e. the estimation of signal can be expressed as：
Above formula represents that interference is successfully inhibited.
(2) process of inhibition of actual interference
Loop antenna is intersected to two monopoles of high-frequency ground wave radar, on the basis of respective monopole subchannel, in progress
Portion's passage calibration.Two monopoles intersect array error between loop antenna, and school is carried out using the echo of the upward ship of Array Method
It is accurate.
Data as shown in Figure 3, since the first frame, using 8dB as thresholding, if the interference of three passages of six passages
The bottom 8dB that makes an uproar is above, that is, thinks that this frame data has Radio frequency interference.
For the frame period of Radio frequency interference be present, the data of the remote member of two monopole crossed loops are taken out, structure
Build 60*2 data matrix.
Using this data matrix, its covariance matrix is sought.
Feature decomposition is done to the covariance matrix, takes characteristic vector corresponding to big characteristic value empty as the son of Radio frequency interference
Between.
For closely first signal of this frame data of Radio frequency interference be present, tried to achieve interference space is being multiplied by just
Intersection of subspace, realize the suppression of Radio frequency interference.
It should be appreciated that the part that this specification does not elaborate belongs to prior art.
Although describing the embodiment of the present invention above in association with accompanying drawing, those of ordinary skill in the art should
Understand, these are merely illustrative of, and various deformation or modification can be made to these embodiments, without departing from the original of the present invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (5)
1. a kind of portable high frequency groundwave radar Radio frequency interference suppressing method, it is characterized in that, high-frequency ground wave radar uses two lists
Extremely sub- crossed loops is as reception antenna；Each monopole, which intersects loop antenna, includes a monopole antenna and two crossed loops days
Line；Radio frequency interference suppressing method comprises the following steps：
Step 1, two monopoles are intersected with loop antenna progress passage calibration；
Step 2, in each frequency sweep cycle, Radio frequency interference is identified；
Step 3, in the frame period that interference be present, first, two monopoles is intersected with the monopole antenna passage of loop antenna, is adopted
With the data matrix of the data structure interference of remote member；Then the covariance matrix of interference is calculated；
Step 4, for the covariance matrix of interference, using the method for feature decomposition, characteristic vector corresponding to big characteristic value is taken to make
For the subspace of interference；
Step 5, nearly the data projection of distance element to above the orthogonal subspaces of interference space, realizes closely first interference
Suppress；
Step 6, intersect the respective realization of two crossed loops antenna channels repeat step 3~5 of loop antenna for two monopoles to do
Disturb suppression.
2. portable high frequency groundwave radar Radio frequency interference suppressing method as claimed in claim 1, it is characterized in that, the tool of step 1
Body, which is realized, to be included：
Step 1.1 intersects the respective internal calibration of loop antenna for two monopoles, using respective monopole antenna passage as reference,
The calibration value of respective two crossed loops antenna channels is calculated, and by the passage compensation for calibrating errors being calculated to respective two
Inside the data of crossed loops antenna channels；
Step 1.2 intersects the calibration between loop antenna for two monopoles, is calibrated using the echo of ship, filters out position
In the upward ship return signal of Array Method, on the basis of one of monopole intersects loop antenna, another monopole is counted
Son intersects the amplitude and phase difference of loop antenna, and is handed over obtained amplitude and phase difference compensation is counted to monopole to be calibrated
Inside the data for pitching loop antenna.
3. portable high frequency groundwave radar Radio frequency interference suppressing method as claimed in claim 1, it is characterized in that, the reality of step 2
Now include：For 1024 frame frequency sweep cycles of each field data, using more than some performance number of bottom of making an uproar as thresholding, if two
Individual monopole, which intersects inside 6 passages of loop antenna, has 3 passages to recognize Radio frequency interference, then it is assumed that this frame data is deposited
In Radio frequency interference.
4. portable high frequency groundwave radar Radio frequency interference suppressing method as claimed in claim 3, it is characterized in that, bottom of making an uproar is not according to
The data that Radio frequency interference be present are tried to achieve, and choose cleaner output play first, are then calculated the on two monopole subchannels
The average of doppler spectral noise power in 60~120 distance elements, obtain noise power；The empirical value of thresholding takes 8dB.
5. portable high frequency groundwave radar Radio frequency interference suppressing method as claimed in claim 1, it is characterized in that, described in step 3
Data matrix for 60*2 matrix, including on two monopole subchannels the 61st~120 distance element data.
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| CN109239678A (en) * | 2018-09-14 | 2019-01-18 | 武汉大学 | A kind of portable high frequency groundwave radar radio frequency interference suppressing method |
| CN110045337A (en) * | 2019-05-10 | 2019-07-23 | 武汉大学 | High-frequency ground wave radar radio frequency interference suppressing method based on tensor subspace projection |
| CN110068839A (en) * | 2019-03-15 | 2019-07-30 | 中国人民解放军63601部队 | Satellite navigation receiver interference detection method based on data statistics |
| CN110398718A (en) * | 2019-06-26 | 2019-11-01 | 武汉大学 | A kind of radio frequency interference suppressing method based on FRFT Frequency Estimation subspace |
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| CN111896913A (en) * | 2020-07-07 | 2020-11-06 | 武汉大学 | High-frequency radar monopole/crossed loop antenna channel gain calibration method and device |
| CN114814738A (en) * | 2022-03-11 | 2022-07-29 | 武汉大学 | Self-adaptive reference distance unit selection method for high-frequency radar radio frequency interference suppression |
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| CN109239678A (en) * | 2018-09-14 | 2019-01-18 | 武汉大学 | A kind of portable high frequency groundwave radar radio frequency interference suppressing method |
| CN109239678B (en) * | 2018-09-14 | 2023-05-16 | 武汉大学 | Portable high-frequency ground wave radar radio frequency interference suppression method |
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| CN110068839B (en) * | 2019-03-15 | 2023-04-28 | 中国人民解放军63601部队 | Satellite navigation receiver interference detection method based on data statistics characteristics |
| CN110045337A (en) * | 2019-05-10 | 2019-07-23 | 武汉大学 | High-frequency ground wave radar radio frequency interference suppressing method based on tensor subspace projection |
| CN110045337B (en) * | 2019-05-10 | 2023-07-21 | 武汉大学 | High-frequency ground wave radar radio frequency interference suppression method based on tensor subspace projection |
| CN110398718A (en) * | 2019-06-26 | 2019-11-01 | 武汉大学 | A kind of radio frequency interference suppressing method based on FRFT Frequency Estimation subspace |
| CN110412552B (en) * | 2019-07-20 | 2023-02-17 | 中国船舶重工集团公司第七二四研究所 | Interference sample self-adaptive selection side lobe cancellation method |
| CN110412552A (en) * | 2019-07-20 | 2019-11-05 | 中国船舶重工集团公司第七二四研究所 | A kind of sidelobe cancellation method that interference sample is adaptively selected |
| CN110445510A (en) * | 2019-07-23 | 2019-11-12 | 纳瓦电子（上海）有限公司 | A kind of method that quadrature phase shift keying inhibits co-channel interference |
| CN110531311A (en) * | 2019-08-27 | 2019-12-03 | 武汉大学深圳研究院 | A kind of LTE external illuminators-based radar DOA estimation method based on matrix recombination |
| CN111896913B (en) * | 2020-07-07 | 2022-09-13 | 武汉大学 | High-frequency radar monopole/crossed loop antenna channel gain calibration method and device |
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Application publication date: 20180109 |