CN106125053A - Pulse Doppler radar polarization anti jamming method - Google Patents

Abstract

The present invention proposes a kind of pulse Doppler radar polarization anti jamming method under complex jamming environment.Utilize this method can significantly increase the rejection ability for multiple interference such as chaff, active suppressing and deceptions, it is achieved target effective is detected.The technical scheme is that: input radar dual polarization echo-signal, decide whether to there is the interference of active pressing type, polarization need to be carried out when there is compacting interference and offset；Then echo signal walking time between pulse before and after calculating, carries out Range Walk Correction to pulse train；Dual polarization passage is made correlative accumulation again, and zero-frequency is moved on to spectral centroid, lock onto target channel number in Doppler's distance two-dimensional matrix, and target two-dimensional tracking ripple door is set, in tracking gate, make two dimension CFAR detection；Finally carry out the detection judgement of target polarization ratio, the signal adjudicated by detection, export as the echo signal after AF panel, thus improve the correct detection probability to target.

Description

Pulse Doppler radar polarization anti jamming method

Technical field

The present invention relates to radar detection field Anti-Jamming Technique, especially relate in chaff, active suppressing and deception etc. dry The anti-interference method in the case of disturbing, target effective detected.

Background technology

Pulse Doppler radar is that the Doppler effect utilizing radar and target relative movement to cause is to detect the arteries and veins of target Rush radar.Owing to this radar can suppress land clutter effectively, be widely used in the motion platform code acquisitions such as airborne, missile-borne and Recognition and tracking target.Along with the development of perturbation technique, pulse Doppler radar face the electronic interferences that becomes increasingly complex and Natural disturbance environment, significantly reduces detection performance.How to improve radar the most anti-interference and reliable inspection under complex electromagnetic environment Survey ability, it is ensured that the true and false of detection target and precision, it has also become one of study hotspot in this field both at home and abroad.

The kind of radar chaff substantially can be divided into two kinds: sourceless seism and active interference.Sourceless seism refers to radar The radar echo signal that other object beyond the target of detection arrives after radar emission signal is produced scattering, miscellaneous including atural object Ripple, sea clutter, chaff etc.；Active interference refers to the electromagnetic signal that observing environment natural radiation or enemy deliberately launch, as active Compacting interference, distance and velocity gate deception formula etc..First radar jamming device is to find radar on remote, intercepts and captures radar detection Pulse, analyzes radar signal parameter, then launches or forward various passive and active interference, making radar target signal be flooded Not among interference, make the radar cannot detect and track target.And the purpose of Radar cross-section redaction is suppression interference, reduces interference shadow Ring, in time, accurately obtain target information.

Pulse Doppler radar uses method clutter reduction based on moving-target detection, obtains wider in Radar cross-section redaction General application.When target is different relative to the movement velocity of radar with interference, the Doppler frequency that both produce also differs, Pulse Doppler radar arranges Doppler filter group, filtering clutter and interference signal, the Doppler's frequency to target echo signal Rate carries out detecting just can extract echo signal.Polarization radar feature reflection target is to polarization of electromagnetic wave scattering properties, with target Shape, material, the factor such as attitude relevant, therefore can utilize the Polarization scattering echo difference of target and interference, suppression interference Echo-signal, strengthens target echo signal, extracts feature in polarizing field, it is achieved classifies and detects identification target.

At present, Radar cross-section redaction algorithm specifically includes that the Waveform Matching recognition methods of (1) radar target；(2) target is special Levy extraction and classifying identification method.Method (1) needs to set up the echo waveform prior information of target or interference, utilizes radar to receive Signal and prior information carry out match cognization, reach to distinguish target and the purpose of interference, draw yet with targeted attitude sensitivity Playing radar bobbing big, cause correct recognition rata the highest, stability is bad, and engineering practicability is the strongest；Method (2) utilizes Target and interference echo statistical property difference, extract the statistical natures such as average, variance, correlation coefficient, uses classifying identification method Target carrying out detection identify, this type of engineer applied is more, but some feature changes greatly with the impact of detection environment, its difficult point It is to select difference target and the validity feature of interference.It addition, said method is often effective just for a kind of interference type, when In the presence of multiple interference simultaneously, it is impossible to reach effective target detection.

Summary of the invention

It is an object of the invention to disturb for chaff, active suppressing and deception etc., it is provided that one can effectively suppress interference, carry The pulse Doppler radar polarization anti jamming method of high target detection probability.

In order to achieve the above object, the present invention proposes a kind of pulse Doppler radar polarization anti jamming method, and its feature exists In comprising the steps: in terminal processes extension set DSP embedded software, with dual polarization passage processing module, pulse train school Positive module, pulse Doppler processing module, same polarization passage two-dimensional detection module and target polarization judging module are cell formation Pulse Doppler radar polarization anti jamming software architecture, wherein, dual polarization passage processing module reads in radar dual polarization echo letter Number, first make cross polarization channel compensation, statistical signal power maximum and receiver noise power, decide whether to there is active pressure Standard is disturbed, and carries out dual polarization interchannel when there is compacting interference and offsets；Pulse train correction module utilizes to follow the tracks of and obtains footpath Echo signal walking time between former and later two pulses of speed calculation, on the basis of first pulse, enters other pulse Row distance walks dynamic(al) correction；M pulse train of same polarization and cross polarization passage is made coherent and is amassed by pulse Doppler processing module Tired, and zero-frequency is moved on to spectral centroid；Same polarization passage two-dimensional detection module utilizes radial velocity to calculate Doppler frequency, locking Target channel number in Doppler-distance two-dimensional matrix, and target two-dimensional tracking ripple door is set, in tracking gate, make two dimension CFAR detection；Target polarization judging module calculates the polarization ratio of useful signal sequence sets, and polarization ratio is carried out polarization ratio inspection Surveying judgement, by the signal of polarization ratio detection judgement, output is as the echo signal after AF panel.

The present invention has the advantages that compared to prior art

The present invention can effectively suppress interference.For interference sources such as chaff, active suppressing and deceptions, the invention provides interference Suppression and target detection recognition methods, and be given a set of many with dual polarization passage processing module, pulse train correction module, pulse General Le processing module, same polarization passage two-dimensional detection module and target polarization judging module are cell formation pulse Doppler radar Polarization anti jamming software architecture, and complete handling process.Being shown by test data analyzer, the method can effectively suppress dry Disturb, improve target correct detection probability, there is stronger engineering practical value.

When the present invention is prevented from not having pressing type to disturb, polarization offsets the echo signal loss caused.The present invention uses elder generation Make cross polarization channel compensation, statistical signal power maximum and receiver noise power, decide whether to there is active pressing type Interference, just carries out dual polarization interchannel when there is compacting interference and offsets.

The present invention can improve target detection probability.For decoy jamming weak dependence in pulse-recurrence time sequence, The present invention uses correlative accumulation to process, and can be effectively improved signal interference ratio, it is simple to succeeding target detects；Target following is utilized to estimate Position and Doppler frequency, can arrange target two-dimensional tracking with lock onto target channel number in Doppler-distance two-dimensional matrix Ripple door, rejects ripple interference outdoors；It is likely present interference in considering tracking gate, calculates polarization ratio feature, carry out target pole Change ratio judgement, effectively suppress the interference of Bo Mennei, improve target correct detection probability further.

The present invention provides solution and heavily fortified point for realizing radar detection identification correct to target under complex jamming environment Real basis.

Accompanying drawing explanation

In order to be more clearly understood that the present invention, existing by drawings and Examples, the present invention is further elaborated, wherein:

Fig. 1 is pulse Doppler radar polarization anti jamming flow chart of the present invention.

Fig. 2 is the flow chart of dual polarization passage processing module in Fig. 1.

Fig. 3 is the flow chart of same polarization passage two-dimensional detection module in Fig. 1.

Detailed description of the invention

The invention will be further described below in conjunction with the accompanying drawings.

Refering to Fig. 1.In embodiment described below, the whole flow process of pulse Doppler radar polarization anti jamming method is adopted It is used in terminal processes extension set, is automatically obtained based on DSP embedded software mode.At terminal processes extension set DSP embedded software In, with dual polarization passage processing module, pulse train correction module, pulse Doppler processing module, the inspection of same polarization passage two dimension Survey module and target polarization judging module is cell formation pulse Doppler radar polarization anti jamming software architecture, wherein, (S1) Dual polarization passage processing module reads in radar dual polarization echo-signal, first makees cross polarization channel compensation, and statistical signal power is Big value and receiver noise power, deciding whether to there is the interference of active pressing type, need to carry out dual polarization when there is compacting interference Interchannel offsets；(S2) pulse train correction module utilizes tracking to obtain radial velocity and calculates the target between former and later two pulses Signal walking time, on the basis of first pulse, carries out Range Walk Correction to other pulse；(S3) pulse Doppler processing M pulse train of same polarization and cross polarization passage is made correlative accumulation by module, and zero-frequency is moved on to spectral centroid；(S4) same POLARIZATION CHANNEL two-dimensional detection module utilizes radial velocity to calculate Doppler frequency, and lock onto target is at Doppler-distance two-dimensional matrix In channel number, and target two-dimensional tracking ripple door is set, in tracking gate, makees two dimension CFAR detection；(S5) target polarization is sentenced Certainly module calculates the polarization ratio of useful signal sequence sets, polarization ratio carries out polarization ratio detection judgement, is detected by polarization ratio The signal of judgement, output is as the echo signal after AF panel, it is achieved the reliable detection to target.

Each module comprises the concrete steps that:

Refering to Fig. 2.In dual polarization passage processes, dual polarization passage processing module carries out cross polarization for difference between channels Channel compensation, cross polarization passage complex signal s after compensation_XY(n)

$s_{XY}\left(n\right)=s_{XY}^0\left(n\right)\·A_c{e}^{{\mathrm{j\φ}}_c}$

In formula,For signal sampling Unit n-th complex signal of cross polarization passage XY, A_cAnd φ_cFor with same polarization passage The amplitude of coupling and phase correction coefficient.Wherein, complex signal s=I+jQ, I and Q is respectively signal sampling two-way orthogonal signalling.

Dual polarization passage processing module, in the case of radar is not launched, adds up receiver noise power

$\stackrel{\‾}{P_n}=\frac{1}{N}\underset{i=1}{\overset{N}{\Σ}}(I_r^2+Q_r^2)$

In formula, I_rAnd Q_rBeing respectively two-way I road and the Q road orthogonal signalling of receiver noise, N is noise statistics sample number.

Dual polarization passage processing module, in the case of radar emission, chooses target or the interference echo signal power of same polarization passage Maximum P_Max

$P_{Max}=max\left\{\right|s_{XX}^0\left(n\right){|}^2\}$

In formula,For signal sampling Unit n-th complex signal of same polarization passage XX, max is for choosing sampled signal power Maximum.Wherein, signal power valueI_XXAnd Q_XXIt is respectively the orthogonal letter of two-way of same polarization passage Number.

Dual polarization passage processing module utilizes target or interference echo signal power maximum and receiver noise power, and judgement is No exist active pressing type interference

IfThen judgement is for without compacting interference

IfThen judgement is for there being compacting interference

Wherein,Represent with 10 as the endLogarithm, SNR₀For radar target normal echo signal to noise ratio, actual make Used time can be according to the parameter determination such as radar transmission power, target range.

When there is compacting interference, dual polarization passage processing module need to carry out dual polarization interchannel and offset

$s_{XX}\left(n\right)=s_{XY}^0\left(n\right)-s_{XY}\left(n\right)$

In formula, s_XXN () is for polarizing the same polarization passage complex signal after offseting.

In pulse train corrects, pulse train correction module utilizes tracking to obtain radial velocity and calculates between former and later two pulses Echo signal walking time τ

$\mathrm{\τ}=\frac{2V_t{T}_r}{c}$

In formula, V_tFor the radial velocity of target Yu radar, T_rFor radar transmitted pulse repetition interval, c is electromagnetic wave propagation Speed.

Pulse Doppler processing module settings accumulation pulse echo number is M, same polarization passage and the arteries and veins of cross polarization passage Rush sequence on the basis of first pulse, other pulse is carried out Range Walk Correction

h_XX(l, n)=s_XX(l,n-(l-1)τ)

h_XY(l, n)=s_XY(l,n-(l-1)τ)

In formula, s_XX(l, n-(l-1) τ) and s_XY(l, n-(l-1) τ) represents same polarization and the l arteries and veins of cross polarization passage respectively Punching and the n-th distance cell signal time delay on Range Profile (l-1) τ, h_XX(l, n) and h_XY(l, n) respectively represent correction after same Polarization and cross polarization l pulse of passage and n-th are apart from cell signal.In order to save amount of calculation, pulse Doppler processing Module can carry out delay compensation in frequency.

In pulse Doppler processing, pulse Doppler processing module is to same polarization and M pulse train of cross polarization passage Same distance cell signal carries out correlative accumulation as discrete Fourier transform

$H_{XX}^0(m,n)=\underset{k=0}{\overset{M-1}{\Σ}}{h}_{XX}(k,n)e^{-j2\mathrm{\π}km/M}$

$H_{XY}^0(m,n)=\underset{k=0}{\overset{M-1}{\Σ}}{h}_{XY}(k,n)e^{-j2\mathrm{\π}km/M}$

In formula,WithRepresent the same polarization after pulse Doppler processing and cross polarization passage the respectively M doppler cells and the n-th distance cell signal.

Zero-frequency, to making the signal after discrete fourier changes, is moved on to spectral centroid by pulse Doppler processing module

$H_{XX}(:,n)=fftshift\left(H_{XY}^0\right(:,n\left)\right)$

$H_{XY}(:,n)=fftshift\left(H_{XY}^0\right(:,n\left)\right)$

In formula,Represent that all doppler cells to the n-th distance unit carry out before and after half segment data Exchange.

Refering to Fig. 3.In same polarization passage two-dimensional detection, same polarization passage two-dimensional detection module input same polarization passage two dimension letter Number, utilize the radial velocity estimation V of target and radar_t, calculate and caused echo-signal to there is Doppler frequency by relative motion

$f_d=\frac{2V_t}{\mathrm{\λ}}$

In formula, f_dFor target Doppler frequency, λ is the operation wavelength of radar emission signal.

Same polarization passage two-dimensional detection module utilizes the position R that target following is estimated_tWith Doppler frequency f_dLock onto target is many Channel number (i in Pu Le-distance two-dimensional matrix₀,j₀)

i₀=fix (2Mf_dT_r)

$j_0=fix\left(\frac{2(R_t-R_{start})}{{\mathrm{cT}}_s}\right)$

In formula, M is accumulation pulse train number, T_rFor radar transmitted pulse repetition interval, T_sFor signal sampling period, R_start For impulse sampling distance starting point, c is propagation velocity of electromagnetic wave, and fix () represents rounding operation.

Same polarization passage two-dimensional detection module supposes target Doppler spectrum widening L_fUnit, radical length accounts for L_rUnit, then same With (i in Doppler-distance two-dimensional matrix in POLARIZATION CHANNEL₀,j₀Centered by), the Doppler of target setting and distance two-dimensional tracking Ripple door, and ripple door internal channel number (i j) need to meet

$\left\{\begin{array}{c}i\∈(i_0-\frac{L_f}{2},i_0+\frac{L_f}{2})\\ j\∈(j_0-\frac{L_r}{2},j_0+\frac{L_r}{2})\end{array}\right..$

Same polarization passage two-dimensional detection module chooses K unit as background sample, background around target two-dimensional tracking ripple door The Criterion of Selecting of sample number K is: estimate the statistical distribution parameter of background with many backgrounds sample number, but should not be too big, not so can increase Adding system amount of calculation.

Same polarization passage two-dimensional detection module supposes background Gaussian distributed, with false-alarm probability P_faDetermine detection threshold μ₀, right The two-dimensional tracking Bo Mennei signal of target Doppler and distance carries out two dimension CFAR detection

If | H_XX(i,j)|≥μ₀, then judgement is useful signal

If | H_XX(i, j) | ＜ μ₀, then judgement is background noise

Wherein,I_XXAnd Q_XXIt is respectively the two-way orthogonal signalling of same polarization passage XX Sampled value.Same polarization passage two-dimensional detection module exports the unit that judgement is useful signal as useful signal sequence sets {H_XX(i', j') }, wherein may have and come from interference, the judgement checking of next step polarization ratio need to be made.

In target polarization ratio is adjudicated, target polarization ratio judging module is useful pass through through same polarization passage two-dimensional detection module Signal sequence collection { H_XX(i', j') }, calculate corresponding cross polarization channel Doppler and the polarization of distance unit (i', j') Ratio

$\mathrm{\ξ}\left(k\right)=\frac{\left|H_{XX}(i^{\′},j^{\′})\right|}{\left|H_{XY}(i^{\′},j^{\′})\right|}$

In formula, ξ (k) is kth Element Polarization ratio in useful signal sequence sets, | H_XX(i', j') | for useful signal sequence sets Same polarization channel signal amplitude, | H_XY(i', j') | for | H_XX(i', j') | corresponding cross polarization channel signal amplitude.

The probability density function of target polarization ratio judging module statistics target polarization ratio, determines pole with certain target detection probability Change ratio thresholding ξ₀, the polarization ratio of useful signal sequence sets is carried out polarization ratio detection judgement

If ξ (k) >=ξ₀, then judgement is target

If ξ (k) is ＜ ξ₀, then judgement is interference

Target polarization ratio judging module is the signal now by polarization ratio detection judgement, and output is as the target after AF panel Signal, it is achieved the reliable detection to target.

In formula, for signal sampling Unit n-th complex signal of cross polarization passage, and be the amplitude mated with same polarization passage and Phase correction coefficient.Wherein, complex signal, and respectively signal sampling two-way orthogonal signalling.

Dual polarization passage processing module, in the case of radar is not launched, adds up receiver noise power

In formula, and the respectively two-way I road of receiver noise and Q road orthogonal signalling, N is noise statistics sample number.

Dual polarization passage processing module, in the case of radar emission, chooses target or the interference echo signal of same polarization passage Power maximum

In formula, for signal sampling Unit n-th complex signal of same polarization passage, for choosing the maximum of sampled signal power.Its In, signal power value, and the two-way orthogonal signalling of respectively same polarization passage.

Dual polarization passage processing module utilizes target or interference echo signal power maximum and receiver noise power, sentences Certainly whether there is the interference of active pressing type

If then judgement is for without compacting interference

If then judgement is for there being compacting interference

Wherein, represent denary logarithm, for radar target normal echo signal to noise ratio, can send out according to radar time actually used Penetrate the parameter determination such as power, target range.

When there is compacting interference, dual polarization passage processing module need to carry out dual polarization interchannel and offset

Same polarization passage complex signal in formula, after offseting for polarization.

In pulse train corrects, pulse train correction module utilizes tracking to obtain radial velocity and calculates former and later two pulses Between echo signal walking time

In formula, for the radial velocity of target Yu radar, for radar transmitted pulse repetition interval, for propagation velocity of electromagnetic wave.

Pulse Doppler processing module settings accumulation pulse echo number is M, same polarization passage and cross polarization passage Pulse train on the basis of first pulse, other pulse is carried out Range Walk Correction

In formula, and represent that same polarization and the pulse of cross polarization passage and the distance cell signal are on Range Profile respectively Time delay, and represent the same polarization after correction and cross polarization passage the pulse and the distance cell signal respectively.In order to save About amount of calculation, pulse Doppler processing module can carry out delay compensation in frequency.

In pulse Doppler processing, pulse Doppler processing module is to same polarization and M pulse of cross polarization passage Sequence same distance cell signal carries out correlative accumulation as discrete Fourier transform

In formula, and represent the same polarization after pulse Doppler processing and cross polarization passage the doppler cells and the respectively Distance cell signal.

Zero-frequency, to making the signal after discrete fourier changes, is moved on to spectral centroid by pulse Doppler processing module

In formula, represent that all doppler cells to the distance unit carry out before and after half segment data and exchange.

Refering to Fig. 3.In same polarization passage two-dimensional detection, same polarization passage two-dimensional detection module input same polarization passage two Dimensional signal, utilizes the radial velocity estimation of target and radar, calculates and caused echo-signal to there is Doppler frequency by relative motion

In formula, for target Doppler frequency, for the operation wavelength of radar emission signal.

Same polarization passage two-dimensional detection module utilizes position and Doppler frequency lock onto target that target following estimates many Channel number in Pu Le-distance two-dimensional matrix

In formula, M is accumulation pulse train number, for radar transmitted pulse repetition interval, for signal sampling period, adopts for pulse Sample distance starting point, for propagation velocity of electromagnetic wave, represents rounding operation.

Same polarization passage two-dimensional detection module supposes target Doppler spectrum widening unit, and radical length accounts for unit, then same In POLARIZATION CHANNEL in Doppler-distance two-dimensional matrix centered by, the Doppler of target setting and distance two-dimensional tracking ripple door, and Ripple door internal channel need meet.

Same polarization passage two-dimensional detection module chooses a unit as background sample, the back of the body around target two-dimensional tracking ripple door The Criterion of Selecting of scape sample number is: estimate the statistical distribution parameter of background with many backgrounds sample number, but should not be too big, not so can increase Adding system amount of calculation.

Same polarization passage two-dimensional detection module supposes background Gaussian distributed, determines detection threshold with false-alarm probability, right The two-dimensional tracking Bo Mennei signal of target Doppler and distance carries out two dimension CFAR detection

If then judgement is useful signal

If then judgement is background noise

Wherein, and the sampled value of the two-way orthogonal signalling of respectively same polarization passage XX.Same polarization passage two-dimensional detection module handle The unit that judgement is useful signal exports as useful signal sequence sets, wherein may have and come from interference, need to make next step pole Change than judgement checking.

In target polarization ratio is adjudicated, target polarization ratio judging module is passing through through same polarization passage two-dimensional detection module Useful signal sequence sets, calculates corresponding cross polarization channel Doppler and the polarization ratio of distance unit

In formula, for kth Element Polarization ratio in useful signal sequence sets, for the same polarization channel signal of useful signal sequence sets Amplitude, for corresponding cross polarization channel signal amplitude.

The probability density function of target polarization ratio judging module statistics target polarization ratio, true with certain target detection probability Determine polarization ratio thresholding, the polarization ratio of useful signal sequence sets is carried out polarization ratio detection judgement

If then judgement is target

If then judgement is interference

Target polarization ratio judging module is the signal now by polarization ratio detection judgement, and output is as the target after AF panel Signal, it is achieved the reliable detection to target.

Claims (10)

1. a pulse Doppler radar polarization anti jamming method, it is characterised in that comprise the steps: at terminal processes extension set In DSP embedded software, with dual polarization passage processing module, pulse train correction module, pulse Doppler processing module, homopolarity Change passage two-dimensional detection module and target polarization judging module is cell formation pulse Doppler radar polarization anti jamming software frame Structure, wherein, dual polarization passage processing module reads in radar dual polarization echo-signal, first makees cross polarization channel compensation, statistics letter Number power maximum and receiver noise power, deciding whether to there is the interference of active pressing type, carrying out when there is compacting interference Dual polarization interchannel offsets；Pulse train correction module utilizes tracking to obtain radial velocity and calculates the mesh between former and later two pulses Mark signal walking time, on the basis of first pulse, carries out Range Walk Correction to other pulse；Pulse Doppler processing mould M pulse train of same polarization and cross polarization passage is made correlative accumulation by block, and zero-frequency is moved on to spectral centroid；Same polarization is led to Road two-dimensional detection module utilizes radial velocity to calculate Doppler frequency, lock onto target leading in Doppler-distance two-dimensional matrix Taoist monastic name, and target two-dimensional tracking ripple door is set, in tracking gate, make two dimension CFAR detection；Target polarization judging module calculates The polarization ratio of useful signal sequence sets, carries out polarization ratio detection judgement to polarization ratio, by the signal of polarization ratio detection judgement, Output is as the echo signal after AF panel.

2. pulse Doppler radar polarization anti jamming method as claimed in claim 1, it is characterised in that: dual polarization passage processes Module carries out cross polarization channel compensation for difference between channels, cross polarization passage complex signal s after compensation_XY(n)

$s_{XY}\left(n\right)=s_{XY}^0\left(n\right)\·A_c{e}^{{\mathrm{j\φ}}_c}$

In formula,For signal sampling Unit n-th complex signal of cross polarization passage XY, A_cAnd φ_cFor with same polarization passage The amplitude of coupling and phase correction coefficient.

3. pulse Doppler radar polarization anti jamming method as claimed in claim 1, it is characterised in that: dual polarization passage processes Module, in the case of radar is not launched, adds up receiver noise power

${\stackrel{\‾}{P}}_n=\frac{1}{N}\underset{i=1}{\overset{N}{\Σ}}(I_r^2+Q_r^2)$

In formula, I_rAnd Q_rBeing respectively two-way I road and the Q road orthogonal signalling of receiver noise, N is noise statistics sample number.

4. pulse Doppler radar polarization anti jamming method as claimed in claim 1, it is characterised in that: dual polarization passage processes Module, in the case of radar emission, chooses target or the interference echo signal power maximum P of same polarization passage_Max

$P_{Max}=max\left\{\right|s_{XX}^0\left(n\right){|}^2\}$

In formula,For signal sampling Unit n-th complex signal of same polarization passage XX, max is to choose sampled signal power Maximum.

5. pulse Doppler radar polarization anti jamming method as claimed in claim 1, it is characterised in that: dual polarization passage processes Module utilizes target or interference echo signal power maximum P_MaxWith receiver noise powerDecide whether to there is active pressure Standard is disturbed

IfThen judgement is for without compacting interference

IfThen judgement is for there being compacting interference

Wherein,Represent with 10 as the endLogarithm, SNR₀For radar target normal echo signal to noise ratio, actual make Used time can be according to the parameter determination such as radar transmission power, target range.

6. pulse Doppler radar polarization anti jamming method as claimed in claim 1, it is characterised in that: same polarization passage two dimension Detection module utilizes the position R that target following is estimated_tWith Doppler frequency f_dLock onto target is in Doppler-distance two-dimensional matrix Channel number (i₀,j₀)

i₀=fix (2Mf_dT_r)

$j_0=fix\left(\frac{2(R_t-R_{start})}{{\mathrm{cT}}_s}\right)$

In formula, M is accumulation pulse train number, T_rFor radar transmitted pulse repetition interval, T_sFor signal sampling period, R_start For impulse sampling distance starting point, c is propagation velocity of electromagnetic wave, and fix () represents rounding operation.

7. pulse Doppler radar polarization anti jamming method as claimed in claim 6, it is characterised in that: same polarization passage two dimension Detection module supposes target Doppler spectrum widening L_fUnit, radical length accounts for L_rUnit, then in same polarization passage with Doppler- (i in distance two-dimensional matrix₀,j₀Centered by), the Doppler of target setting and distance two-dimensional tracking ripple door, and ripple door internal channel number (i j) need to meet

$\left\{\begin{array}{c}i\∈(i_0-\frac{L_f}{2},i_0+\frac{L_f}{2})\\ j\∈(j_0-\frac{L_r}{2},j_0+\frac{L_r}{2})\end{array}\right..$

8. pulse Doppler radar polarization anti jamming method as claimed in claim 1, it is characterised in that: same polarization passage two dimension Detection module supposes background Gaussian distributed, with false-alarm probability P_faDetermine detection threshold μ₀, to target Doppler and distance Two-dimensional tracking Bo Mennei signal carries out two dimension CFAR detection

If | H_XX(i,j)|≥μ₀, then judgement is useful signal

If | H_XX(i, j) | ＜ μ₀, then judgement is background noise

Wherein,I_XXAnd Q_XXIt is respectively the two-way orthogonal signalling of same polarization passage XX Sampled value.

9. pulse Doppler radar polarization anti jamming method as claimed in claim 8, it is characterised in that: same polarization passage two dimension Detection module exports the unit that judgement is useful signal as useful signal sequence sets { H_XX(i', j') }, to may be from Interference, by the judgement checking of next step polarization ratio.

10. pulse Doppler radar polarization anti jamming method as claimed in claim 9, it is characterised in that: target polarization ratio is sentenced Certainly the probability density function of module statistics target polarization ratio, determines polarization ratio thresholding ξ with certain target detection probability₀, to having Polarization ratio detection judgement is carried out with the polarization ratio of signal sequence collection

If ξ (k) >=ξ₀, then judgement is target

If ξ (k) is ＜ ξ₀, then judgement is interference

Wherein, kth Element Polarization ratio during ξ (k) is useful signal sequence sets.