CN104678367B - Velocity deception interference resisting method for airborne pulse Doppler radar - Google Patents

Abstract

The invention belongs to the anti-interference technique for design of an airborne pulse Doppler radar system, and relates to a radar single-target velocity deception interference resisting method. The radar single-target velocity deception interference resisting method comprises the following steps of 1, enabling a radar to detect and track a target, obtaining the frequency of a single-target point tracking center, dividing by 1,000, converting into kHz, and recording as f0; 2, in the tracking process, when one target point is tracked, setting the tracking as the normal single-target point tracking, and directly finishing; 3, utilizing a weighting coefficient method to calculate the frequency weight of a plurality of target points; (1) solving the weight; (2) solving the weighting frequency and fsum=fmu*bmu+fjam*bjam; (3) solving the weighting coefficient and csum=bmu+bjam; (4) solving the weighting result: as shown in the attached figure; 4 sending the weighting result to a radar tracking center. The method has the advantages that the identifying of the deception interference is not needed, the interference information and the target information are inputted together to process, and the velocity deception interference can be resisted; the velocity deception interference can be effectively resisted, and the target is reliably and accurately tracked; the calculation amount is less, the operation speed is high, and the portability is high.

Description

A kind of anti-velocity gate deception interference method of Airborne Pulse Doppler Radar

Technical field

The invention belongs to the Anti-Jamming Technique in Airborne Pulse Doppler Radar system design, it is related to a kind of radar single goal Anti- velocity gate deception interference method.

Background technology

Velocity gate deception interference is usually Doppler frequency interference, and its ultimate principle is：According to the radar signal receiving, do Machine of disturbing forwards several interference signals different from target echo Doppler frequency fd simultaneously, makes the speed Tracking circuit of radar same When multiple Doppler frequencies is detected, or be difficult to detect the fd of real goal, affect normal detecting and tracking.One effectively Velocity gate deception interference signal there are compared with real goal two obvious features：1. Doppler frequency is different from truly Target；2. signal power is better than or is equal to real goal.

When radar continuous tracking mode is in the carrier of jammer it is possible to speed tracting hinder and damage its speed with Track, and then reach the normal purpose followed the tracks of of interference radar.Concrete grammar is, after jammer detects other side's radar signal, will receive The radar pulse that arrives amplifies, and additionally increases appropriate Doppler frequency shift (corresponding radial velocity) and launch.Attached Doppler frequency shift increases or decreases (simulation accelerated or decelerating flight) by specific rule, returns more than target towing echo strength Under conditions of ripple, the speed gate of radar will be dragged away.One kind typically tows method and can be divided into following components：

Capture section：Purpose is the speed gate making jammer detect other side's radar：

Speed tracting section：Effect is with interference signal, radar speed ripple door to be towed；

Maintaining segment：Effect is that interference signal stably followed the tracks of by the speed gate making radar；

Stop segment：Stop transmitting interference signal, effect is the speed Tracking ripple door internal interference blackout making radar.

Interference signal disappear after because speed Tracking ripple door is disturbed impact, have deviated from target echo, thus speed with There is no any signal in track door, lead to radar to exit tracking mode, re-start search.Once radar captures target echo again Afterwards, jammer restarts new to tow the cycle.Radar is thus made to be disturbed impact and tenacious tracking can not be kept.

The method of anti-velocity gate deception interference,《Radar science and technology》Phase April 02 in 2004, " Kohonen network was used for thunder Reach the feature extraction in anti-velocity gate deception interference ",《System engineering and electronic technology》Calendar year 2001 volume 23 the 5th phase " speed tracting Lower moving object detection " and《Electronic information countermeasure techniques》The 3rd phase of May in 2007 volume 22 " adjust the distance-velocity gate deception interference The articles such as identification method " have research it was also proposed that some concrete grammars, but stay in Computer Simulation these methods more and divide Analysis, and set up in advance judge be target or interference, on the basis of then being processed again, not in actual radar system It is applied in system.

Content of the invention

The purpose of the present invention is：The method proposing a kind of interference of Airborne Pulse Doppler Radar anti-velocity gate deception.The method Radar can be made when monotrack (STT) to be effective against velocity gate deception interference, target is reliably and accurately followed the tracks of, And meet the requirement that amount of calculation is little, fast operation, portability are high.

Technical scheme：Method involved in the present invention is that probability data interconnection filtered method develops, It realizes being to consider to fall into all candidate's echoes in detection interval, does not differentiate target or cheating interference, according to these echoes Frequency change, give different echoes different weight coefficients, make target weight big, cheating interference weight is little, makes inspection center Deflection target, thus disturb to resist velocity gate deception.

A kind of anti-velocity gate deception interference method of Airborne Pulse Doppler Radar, comprises the following steps：

Step 1：With detections of radar, follow the tracks of target, obtain monocular punctuate tracking center frequency, be converted into kHz divided by 1000, It is designated as f₀；

Step 2：During following the tracks of, if 1 impact point, for normal monotrack, directly terminate；

If there is multiple impact points, then enroll the frequency information of multiple impact points, by the frequency of each impact point divided by 1000, it is converted into kHz, be designated as f_mu,f_jam；

Step 3：Using weighting factor method, calculate the frequency weight of above-mentioned multiple impact points；

(1) seek power

a_mu=abs (f_mu-f₀),

a_jam=abs (f_jam-f₀),

a_muFor target frequency f_muWith monocular punctuate tracking center frequency f₀Difference absolute value；

a_jamFor interfering frequency f_jamWith monocular punctuate tracking center frequency f₀Difference absolute value；

(2) ask weighted frequency and

f_sum=f_mu×b_mu+f_jam×b_jam,

(3) ask weight coefficient and

c_sum=b_mu+b_jam,

(4) weighted results are sought：

C is constant, g_mu, g_jamFrequency change rate for target and interference；

t*g_mu＜ f_g-f_mu＜ t*g_jam

I.e.

I.e.

Wherein f_z=f_jam-f_mu

T is the frame period,

f_zDuring for detecting target, the distinguishable frequency interval of minimum of interference and target；

Step 4：Give Radar Tracking Center weighted results.

The present invention has following items advantage：The maximum bright spot of this method, need not differentiate to cheating interference, dry Disturb, target information inputs together, processed so that it may be resisted velocity gate deception interference；It is effective against velocity gate deception interference, to mesh Mark is reliably and accurately followed the tracks of；Amount of calculation is little, fast operation, portable high.

Brief description

Fig. 1 is flow chart of the present invention.

Specific embodiment

With reference to Figure of description, the invention will be further described：

A kind of anti-velocity gate deception interference method of Airborne Pulse Doppler Radar, comprises the following steps：

Step 1：With detections of radar, follow the tracks of target, obtain monocular punctuate tracking center, be converted into kHz, be designated as f₀；

Step 2：During following the tracks of, if 1 impact point, for normal monotrack, directly terminate；

If there is multiple impact points, then enroll the frequency information of multiple impact points, by the frequency of each impact point/ 1000, it is converted into kHz, be designated as f_mu,f_jam；

Step 3：Using weighting factor method, calculate the frequency weight of above-mentioned multiple impact points；

(1) seek power

a_mu=abs (f_mu-f₀),

a_jam=abs (f_jam-f₀)；

(2) ask weighted frequency and

f_sum=f_mu×b_mu+f_jam×b_jam,

(3) ask weight coefficient and

c_sum=b_mu+b_jam,

(4) weighted results are sought

C is constant, g_mu, g_jamFrequency change rate for target and interference

g_mu＜ f_g-f_mu＜ g_jam

I.e.

I.e.

Wherein f_z=f_jam-f_mu

T is the frame period,

f_zDuring for detecting target, the distinguishable frequency interval of minimum of interference and target；

Step 4：Give Radar Tracking Center weighted results.

Embodiment：Taking certain type radar as a example, the frequency change rate g of target_muFor 1.5KHz/s～2KHz/s, the frequency of interference Rate of change g_jamFor 3KHz/s～4KHz/s, minimum distinguishable frequency interval f_zFor 1kHz, t is 0.05s, and c is taken as 2.

Using weighting factor method, under monotrack environment, if the echo falling in detection interval is more than one, these In candidate's echo, only one of which is from target, and remaining is all to be produced by false-alarm or " clutter ", interference signal as false-alarm Or clutter, using the weight coefficient with frequency dependence, make the weight of target greatly, the weight of interference is little, makes the weight of target long-range In the weight of interference, the signal that process is sent is close with echo signal frequency, trends towards echo signal.Focus on weight coefficient Selection, choosing method is shown in step 3.Using weight coefficient method, finally trend towards following the tracks of target, reach the work of anti-velocity gate deception With.

This method passes through certain long-term Flight of model radar, is effective against velocity gate deception interference, target is carried out Reliably and accurately follow the tracks of.

Claims (1)

1. a kind of anti-velocity gate deception interference method of Airborne Pulse Doppler Radar is it is characterised in that comprise the following steps：

Step 1：With detections of radar, follow the tracks of target, obtain monocular punctuate tracking center frequency, be converted into kHz divided by 1000, be designated as f₀；

Step 2：During following the tracks of, if 1 impact point, for normal monotrack, directly terminate；

If there is multiple impact points, then enroll the frequency information of multiple impact points, by the frequency of each impact point divided by 1000, It is converted into kHz, be designated as f_mu,f_jam；

Step 3：Using weighting factor method, calculate the frequency weight of above-mentioned multiple impact points；

(1) seek power

a_mu=abs (f_mu-f₀),

a_jam=abs (f_jam-f₀),

$b_{mu}=e^{-c*a_{mu}},$

$b_{jam}=e^{-c*a_{jam}},$

a_muFor target frequency f_muWith monocular punctuate tracking center frequency f₀Difference absolute value；

a_jamFor interfering frequency f_jamWith monocular punctuate tracking center frequency f₀Difference absolute value；

(2) ask weighted frequency and

f_sum=f_mu×b_mu+f_jam×b_jam,

(3) ask weight coefficient and

c_sum=b_mu+b_jam,

(4) weighted results are sought：

$f_g=\frac{f_{sum}}{c_{sum}};$

C is constant, g_mu, g_jamFrequency change rate for target and interference；

t*g_mu＜ f_g-f_mu＜ t*g_jam

I.e.

$t*g_{mu}<\frac{f_{jam}{e}^{-c*a_{jam}}-f_{mu}{e}^{-c*a_{jam}}}{e^{-c*a_{jam}}+e^{-c*a_{nu}}}<t*g_{jam}$

$t*g_{mu}<\frac{f_{jam}-f_{mu}}{1+e^{-c*(a_{mu}-a_{jam})}}<t*g_{jam}$

$\frac{-1}{a_{mu}-a_{jam}}\ln (\frac{f_{jam}-f_{mu}}{t*g_{mu}}-1)<c<\frac{-1}{a_{mu}-a_{jam}}\ln (\frac{f_{jam}-f_{mu}}{t*g_{jam}}-1)$

I.e.

Wherein f_z=f_jam-f_mu

$\frac{-1}{\left|g_{mu}\right|-\left|g_{jam}\right|}ln(\frac{f_z}{t*g_{mu}}-1)<c<\frac{-1}{\left|g_{mu}\right|-\left|g_{jam}\right|}ln(\frac{f_z}{t*g_{jam}}-1)$

T is the frame period,

f_zDuring for detecting target, the distinguishable frequency interval of minimum of interference and target；

Step 4：Give Radar Tracking Center weighted results.