CN112986938B - Collaborative deception jamming method based on unmanned aerial vehicle formation - Google Patents
Collaborative deception jamming method based on unmanned aerial vehicle formation Download PDFInfo
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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Abstract
The invention relates to the technical field of radar interference, in particular to a cooperative deception interference method based on unmanned aerial vehicle formation. The method comprises the following steps: forming a formation of unmanned aerial vehicles by four unmanned aerial vehicle carrying the jammers; after the jammer receives radar pulse, carrying out jammer pairing on unmanned aerial vehicle formation according to the incoming wave signal direction to form two interference loops; forwarding radar pulses with minimum delay time, and capturing a range gate of the monopulse radar; the interference machine gradually increases the forwarding delay time, so that the distance wave gate gradually deviates from the platform to reflect echo, the interference signal to interference ratio in the distance wave gate is continuously increased, the interference gain is continuously increased, and the angle measurement error is increased; and after the platform reflection echo moves out of the range gate, increasing the angle measurement error until the monopulse radar is unlocked. The embodiment of the invention can keep a more stable interference effect under any rotation angle of the interference machine.
Description
Technical Field
The invention relates to the technical field of radar interference, in particular to a cooperative deception interference method based on unmanned aerial vehicle formation.
Background
Monopulse radar is a tracking radar that can obtain all angular position information of a target from a single echo pulse signal. Monopulse radar is widely used in the fields of gun control, target tracking, missile guidance and the like due to higher angle measurement precision and stronger anti-interference capability, and poses a serious threat to modern military systems. Because the traditional interference method is difficult to interfere with the monopulse radar, the interference aiming at the monopulse radar becomes a research hot spot in the field of electronic warfare (Electronic Warfare, EW). The students at home and abroad use the defects of the design and the manufacture of the monopulse radar to put forward interference methods aiming at the monopulse radar, such as towing decoy interference, cross polarization interference, formation interference, cross eye interference and the like. Among them, cross-eye interference is considered as the most effective interference pattern for interfering with monopulse radars.
With the great application of intelligent unmanned aerial vehicle technology in the military field, unmanned aerial vehicle bee colony combat will be an important combat style in future warfare.
The inventors have found in practice that the above prior art has the following drawbacks:
the method is limited by the harsh parameter tolerance of the traditional two-source cross-eye interference technology, so that the carriers in narrow spaces such as unmanned planes, small airplanes and the like cannot realize a good interference effect, and the application of the cross-eye interference technology is limited; the interference units of the traditional reverse cross eye interference scheme are linearly arranged, so that the interference effect can be influenced by the rotation angle of an interference platform, and when the monopulse radar is positioned on the side surface of the two-point source reverse cross eye interference machine, namely, the rotation angle of the interference machine is larger, the interference effect is poorer.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a cooperative deception jamming method based on unmanned aerial vehicle formation, which adopts the following technical scheme:
the embodiment of the invention provides a cooperative spoofing type interference method based on unmanned aerial vehicle formation, which comprises the following steps of:
forming an unmanned aerial vehicle formation by four unmanned aerial vehicle units carrying the jammers, wherein the unmanned aerial vehicle formations are arranged in a square shape;
after the interference machine receives radar pulse, carrying out interference machine pairing on the unmanned aerial vehicle formation according to the incoming wave signal direction to form two interference loops, wherein each interference loop comprises two interference units after pairing, and a space configuration of self-adaptive multi-loop reverse phase cross eye interference for the unmanned aerial vehicle formation is formed; forwarding radar pulses with minimum delay time, and capturing a range gate of the monopulse radar;
the interference machine gradually increases the forwarding delay time, so that the distance wave gate gradually deviates from the platform to reflect echo, the interference signal to interference ratio in the distance wave gate is continuously increased, the interference gain is continuously increased, and the angle measurement error is increased; the interference signal ratio is the ratio of the sum of the amplitudes of all the platform reflection echoes to the sum of the amplitudes of the multipath interference signals, and the interference signal ratio and the interference gain are in positive correlation;
and after the platform reflection echo moves out of the range gate, increasing the angle measurement error until the monopulse radar is unlocked.
Preferably, the method for pairing the jammers comprises the following steps:
according to the included angle between the incoming wave signal direction and the advancing direction of the unmanned aerial vehicle formation, the pairing of the interference units is changed, and the advancing direction of the unmanned aerial vehicle formation is any diagonal direction of a square.
Preferably, when an included angle between an incoming wave signal direction and a forward direction of unmanned aerial vehicle formation is 0 ° to 90 ° or-90 ° to-180 °, the pairing of interference units is a first interference mode, two unmanned aerial vehicles on a diagonal line serving as the forward direction are respectively used as a first interference unit and a fourth interference unit, and the diagonal line is used as a boundary line, and the interference unit closest to the incoming wave signal and the interference unit located on the same side of the diagonal line as the incoming wave signal are paired; the first interference loop of the first interference pattern comprises paired first and second interference units; the second interference loop of the first interference pattern comprises paired third and fourth interference units; the first and fourth interference units are responsive to an external signal.
Preferably, when an included angle between an incoming wave signal direction and a forward direction of unmanned aerial vehicle formation is 90 degrees to 180 degrees or 0 degrees to-90 degrees, the pairing of interference units is a second interference mode, two unmanned aerial vehicles on a diagonal line serving as the forward direction are respectively used as a first interference unit and a fourth interference unit, and the diagonal line serving as a dividing line is used for pairing an interference unit closest to an incoming wave signal and an interference unit located on the same side of the diagonal line as the incoming wave signal; the first interference loop of the second interference mode comprises a paired first interference unit and third interference unit; the second interference loop of the second interference mode comprises a second interference unit and a fourth interference unit which are paired; the first and fourth interference units are responsive to an external signal.
Preferably, the first interference mode is a working mode that:
the signal received by the first interference unit is transmitted to the second interference unit after amplitude gain and phase shift modulation, and then transmitted by the second interference unit; the signal received by the second interference unit is directly forwarded to the first interference unit and then transmitted by the first interference unit; the signal received by the third interference unit is transmitted to the fourth interference unit after being modulated by amplitude gain and phase offset, and then transmitted by the fourth interference unit; the signal received by the fourth interference unit is directly forwarded to the third interference unit and then transmitted by the third interference unit.
Preferably, the second interference mode is an operation mode that:
the signal received by the first interference unit is transmitted to the third interference unit after being modulated by amplitude gain and phase offset, and then transmitted by the third interference unit; the signal received by the third interference unit is directly forwarded to the first interference unit and then transmitted by the first interference unit; the signal received by the second interference unit is transmitted to the fourth interference unit after being modulated by amplitude gain and phase offset, and then transmitted by the fourth interference unit; the signal received by the fourth interference unit is directly forwarded to the second interference unit and then transmitted by the second interference unit.
Preferably, the method for capturing the distance wave gate comprises the following steps:
increasing the amplitude difference in the interference modulation direction to increase the sum channel echo of the monopulse radar so as to capture a range gate; the interference modulation direction is the transmission direction of the amplitude and phase modulation of the received signal in the interference loop.
Preferably, after the target echo moves out of the range gate, the method for increasing the angle measurement error is as follows:
amplitude gains of the two interference loops are modulated, so that high cross eye gain is obtained by self-adaptive multi-loop reverse cross eye interference, and angle measurement errors are increased.
Preferably, the method for adjusting the interference-to-signal ratio is as follows: by mismatch of the interference loop amplitude ratio and the interference loop phase difference of the interference loop, a higher interference signal ratio is obtained.
Preferably, the interference-to-signal ratio is greater than 20dB.
The invention has the following beneficial effects:
1. according to the embodiment of the invention, the unmanned aerial vehicle formation forms self-adaptive multi-loop reverse phase cross eye interference, and a stable interference effect can be maintained under any interference machine corner.
2. The embodiment of the invention can improve the interference-signal ratio of the reverse cross eye interference, increase the interference gain and improve the interference effect through the combination of the self-adaptive multi-loop reverse cross eye interference and the distance wave gate interference.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions and advantages of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a coordinated spoofing type interference method based on unmanned aerial vehicle formation according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a graph showing the angular error of a monopulse radar under different jammer angles due to two opposite cross-hole jammers according to one embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the geometric relationship of adaptive multi-loop reverse cross-eye interference according to one embodiment of the present invention;
FIG. 4 is a graph showing the relationship between the interference and signal ratio and the interference gain median simulation experiment according to one embodiment of the present invention;
FIG. 5 shows a according to one embodiment of the present invention 2 ＝-0.5dB，φ 2 Normalized sir gain example plot at=175°;
FIG. 6 shows a according to one embodiment of the present invention 2 ＝-0.5dB，φ 2 A contour plot of the signal to interference ratio at 175 °.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following description refers to the specific implementation, structure, characteristics and effects of the cooperative spoofing type interference method based on unmanned aerial vehicle formation according to the invention in combination with the accompanying drawings and the preferred embodiment. In the following description, different "one embodiment" or "another embodiment" means that the embodiments are not necessarily the same. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The following specifically describes a specific scheme of the cooperative spoofing type interference method based on unmanned aerial vehicle formation.
Referring to fig. 1, a flowchart of a coordinated spoofing type interference method based on unmanned aerial vehicle formation according to an embodiment of the present invention is shown, and the method includes the following steps:
and S001, forming an unmanned aerial vehicle formation by four unmanned aerial vehicle units carrying the jammers, wherein the unmanned aerial vehicle formations are in square arrangement.
The small unmanned aerial vehicle has smaller size and the span is generally 1-2 m, if the interference antenna pair is arranged on one small unmanned aerial vehicle, the interference antenna pair is limited by the size of the unmanned aerial vehicle, the interference base line is too short, larger angle measurement error cannot be generated, and the effect of cross eye interference can be influenced.
According to the embodiment of the invention, a square unmanned aerial vehicle formation is designed, which consists of four unmanned aerial vehicles, the advancing direction of the unmanned aerial vehicle formation is any diagonal direction of the square, each unmanned aerial vehicle is loaded with an interference machine, wireless communication is adopted between the interference machines, and two unmanned aerial vehicles form an interference machine pair, so that the length of an interference base line is ensured.
Step S002, after the jammer receives the radar pulse, carrying out jammer pairing on the unmanned aerial vehicle formation according to the incoming wave signal direction to form two interference loops, wherein each interference loop comprises two interference units with completed pairing; the radar pulse is forwarded with minimum delay time, and the range gate of the monopulse radar is captured.
Referring to fig. 3, the radar aperture length is d r The distance between the jammers is d c . The distance from the geometric center of the unmanned aerial vehicle formation to the center point of the monopulse radar is r. Radar central point to a certain jammerIs a half angle theta relative to the direction to the center point of the nth interfering loop en The rotation angle of the visual axis direction of the radar relative to the central direction of the radar reaching the nth interference loop is radar rotation angle theta rn The rotation angle of the visual axis direction of the nth interference loop relative to the direction from the visual axis direction to the radar center is theta cn 。
The method comprises the following specific steps of:
1) According to the included angle theta between the incoming wave signal direction and the advancing direction of the unmanned aerial vehicle formation s And changing the pairing of the interference units and the corresponding transmission directions to form a spatial configuration of self-adaptive multi-loop reverse phase cross eye interference facing unmanned aerial vehicle formation. The method comprises the following specific steps of:
a) When the included angle between the incoming wave signal direction and the advancing direction of the unmanned aerial vehicle formation is 0-90 degrees or-90 degrees to-180 degrees, the pairing of the interference units is a first interference mode, two unmanned aerial vehicles on the diagonal line serving as the advancing direction are respectively used as a first interference unit and a fourth interference unit, the diagonal line serving as a dividing line is used for pairing the interference unit closest to the incoming wave signal and the interference unit located on the same side of the diagonal line with the incoming wave signal; the first interference loop of the first interference pattern comprises paired first and second interference units; the second interference loop of the first interference pattern comprises paired third and fourth interference units; the first and fourth interference units are responsive to an external signal.
The working mode of the first interference mode is as follows:
the signal received by the first interference unit is transmitted to the second interference unit after amplitude gain and phase shift modulation, and then transmitted by the second interference unit; the signal received by the second interference unit is directly forwarded to the first interference unit and then transmitted by the first interference unit; the signal received by the third interference unit is transmitted to the fourth interference unit after being modulated by amplitude gain and phase offset, and then transmitted by the fourth interference unit; the signal received by the fourth interference unit is directly forwarded to the third interference unit and then transmitted by the third interference unit.
b) When the included angle between the incoming wave signal direction and the advancing direction of the unmanned aerial vehicle formation is 90-180 degrees or 0-90 degrees, the pairing of the interference units is a second interference mode, two unmanned aerial vehicles on the diagonal line serving as the advancing direction are respectively used as a first interference unit and a fourth interference unit, the diagonal line serving as a dividing line is used for pairing the interference unit closest to the incoming wave signal and the interference unit located on the same side of the diagonal line as the incoming wave signal; the first interference loop of the second interference mode comprises a paired first interference unit and third interference unit; the second interference loop of the second interference mode comprises a second interference unit and a fourth interference unit which are paired; the first and fourth interference units are responsive to an external signal.
The working mode of the second interference mode is as follows:
the signal received by the first interference unit is transmitted to the third interference unit after being modulated by amplitude gain and phase offset, and then transmitted by the third interference unit; the signal received by the third interference unit is directly forwarded to the first interference unit and then transmitted by the first interference unit; the signal received by the second interference unit is transmitted to the fourth interference unit after being modulated by amplitude gain and phase offset, and then transmitted by the fourth interference unit; the signal received by the fourth interference unit is directly forwarded to the second interference unit and then transmitted by the second interference unit.
In the case of any interference unit pairing and interference direction modulation, the interference rotation angle θ cn The range of values of (C) is [ -pi/4, pi/4)]When the first interference unit is paired with the second interference unit, and the third interference unit is paired with the fourth interference unit, the modulation direction is from the first interference unit to the second interference unit, and from the third interference unit to the fourth interference unit. When the first interference unit is paired with the third interference unit, the second interference unit is paired with the fourth interference unit, and the modulation direction is from the first interference unit to the third interference unit and from the second interference unit to the fourth interference unit. The amplitude gain and the phase offset of any interference loop are respectively a n And phi n . In the embodiment of the invention, the amplitude gains of the two groups of interference loops in the interference modulation direction are respectively a 1 And a 2 The phase offsets are phi respectively 1 And phi 2 。
It should be noted that, for the self-adaptive multi-loop reverse cross eye interference formed by unmanned aerial vehicle formation, the larger the cross eye gain is, the larger the angle measurement error generated by the monopulse radar is, and the better the interference effect is.
Referring to fig. 2, a graph of angular errors produced by two types of reverse cross-eye interference with monopulse radar at different jammer angles is shown. As can be seen from the figure, when the rotation angle of the jammer is + -90 DEG, that is, the monopulse radar is positioned at the end of the two-point source reverse cross-hole jammer antenna array, the angle measurement error theta d =0, at which point two point source reverse cross eye interference fails. And the angle measurement error theta of the self-adaptive multi-loop reverse cross eye interference d Always greater than 0, it is indicated that the adaptive multi-loop directional cross eye interference can remain effective for monopulse radar in any incoming wave direction.
2) The radar pulse is forwarded with minimum delay time, and the amplitude difference in the interference modulation direction is increased to improve the sum channel echo of the monopulse radar so as to capture the range gate. The interference modulation direction is the transmission direction of the amplitude and phase modulation of the received signal in the interference loop.
The signals of different interference loops are mutually counteracted in a monopulse radar channel, so that the cross eye gain is reduced, the larger the phase difference of the interference loops is, the more serious the interference signal counteraction is, and the more severe the system parameter tolerance is. Therefore, the interference loop phase difference can have serious influence on the reverse cross eye interference, especially when the amplitude ratio and the phase difference in the modulation direction approach to ideal values, the angle factor can be uncontrollably and continuously changed rapidly, and the stability of the cross eye interference is seriously affected. Thus, cross-eye interference is more sensitive to phase mismatch, interference loop amplitude differences have less effect on the system parameter tolerance of cross-eye interference, and jammers are easier to adjust amplitude, so that the sum channel echo of monopulse radar is improved by increasing the amplitude differences in the interference modulation direction during acquisition to acquire radar gates.
Since the interference signal and the echo pulse are substantially coincident, the interference signal in the radar gate is relatively low, and the amplitude mismatch reduces the cross eye gain, the angle measurement error generated by the monopulse radar is small.
The calculating step of the cross eye gain comprises the following steps:
when interference loop difference exists, the total sum channel and the difference channel echo of the monopulse radar are respectively
P n ＝P r (θ rn -θ en )P c (θ cn -θ en )P r (θ rn +θ en )P c (θ cn +θ en )
Wherein P is r (θ rn ±θ en ) For radar antenna beam at θ rn ±θ en Gain in direction, P c (θ cn ±θ en ) Antenna beam at θ for the nth interference loop cn ±θ en The gain in the direction, β=2pi/λ, is a spatial phase constant.
Where β=2pi/λ is the spatial phase constant.
The single pulse ratio is
Wherein,representing the modulation result after amplitude gain and phase offset,/or->To take the imaginary part.
Since the distributed multi-point source cross-eye jammer is positioned in the radiation far field of the monopulse radar antenna, d is cn ＜＜r，θ en ＜＜βd r Half angle theta of interference antenna en Is of small value of theta cn ≈θ c1 ，θ rn ≈θ r1 ，k rn And k cn Can be simplified into
P n ≈P r 2 (θ r1 )P c 2 (θ c1 )
Substituting single pulse ratio formula
Wherein,for the interference loop difference between different interference loops, a' n For the amplitude ratio of the nth interfering loop to the first interfering loop, +.>A phase difference between the nth interference loop and the first interference loop; />To take the real part operation.
Then the cross eye gain
Therefore, the interference loop difference can influence the cross eye gain, thereby influencing the interference performance and the system parameter tolerance, and the sign of the cross eye gain can be changed when the interference loop difference is serious, so that the cross eye interference can not stably generate false targets on the same side, or the cross eye interference machine can be changed into a beacon machine, and the effect of the cross eye interference is seriously influenced.
Step S003, the jammer gradually increases the forwarding delay time, so that the distance wave gate gradually deviates from the platform reflection echo, the interference signal to noise ratio in the distance wave gate is continuously increased, the interference gain is continuously increased, and the angle measurement error is increased; the interference signal ratio is the ratio of the sum of the amplitudes of all the platform reflection echoes to the sum of the amplitudes of the multipath interference signals, and the interference signal ratio and the interference gain have positive correlation.
Although the monopulse radar has higher angle measurement precision and stronger anti-interference capability in angle, detection and tracking are still needed to be completed in distance, and a distance detection tracking circuit, an automatic gain control (Automatic Gain Control, AGC) circuit and the like of the monopulse radar are not obviously different from those of the common radar, and the anti-interference capability is relatively weak, so that the range spoofing interference to the common radar can also interfere with the monopulse radar.
The range gate towing interference is a deception interference mode aiming at a range automatic tracking system, is mainly used as self-defense interference and can be divided into three stages of capturing period, towing period and towing stopping period. Decoy distance function R of range gate trailing interference f The expression of (t) is
Wherein R is the initial distance of the target, v is the uniform speed of towing, a is the uniform speed of towing, T j Is single timeThe longest interference time of the interference period.
0≤t<t 1 For the acquisition period, the jammer amplifies after intercepting the radar pulse and directly forwards with minimal delay, the amplified signal is for capturing the AGC circuit of the radar receiver, and the wave gate acquisition period generally lasts about 1s due to the response time of the AGC circuit. t is t 1 ≤t<t 2 In the towing period, after the jammer captures the radar range gate, pulse forwarding delay is gradually increased, so that the range gate gradually deviates from a target echo. t is t 2 ≤t<T j In order to stop the towing period, after the range gate is completely towed away from the target, the jammer is closed, so that the tracking radar loses the target and reenters the searching state. After the radar has re-targeted, the jammer repeats the above process. The forwarding delay expression of the distance wave gate towing interference is
In the embodiment of the invention, the self-adaptive multi-loop reverse cross eye interference is combined with the distance wave gate dragging interference to perform distance-angle two-dimensional combined interference, the platform reflection echo is isolated, the influence of the platform reflection echo on the cross eye interference effect is eliminated, higher interference gain is obtained, and the better interference effect is achieved.
Specifically, the jammer gradually increases the forwarding delay, so that the distance wave gate gradually deviates from the platform reflection echo, when the platform reflection echo gradually moves out of the distance wave gate, the interference signal to interference ratio in the radar wave gate is continuously increased, the interference gain can be gradually increased, the cross eye gain is increased when the platform reflection echo is isolated, and the angle measurement error is increased.
The specific calculation steps of the interference gain comprise:
normalized gain S of sum channel of monopulse radar in direction of jammer m m Normalized gain D of sum and difference channel m The method comprises the following steps of:
where n represents the nth interfering loop and the sign "±" represents interfering elements closer to and farther from the monopulse radar, respectively.
Then the unmanned aerial vehicle forms a total platform echo S at the monopulse radar and the channel s Total platform echo D of sum and difference channel s The method comprises the following steps of:
wherein,representing the platform reflection echo of the mth jammer.
Adding the interference signal and the platform reflection echo to obtain a sum-difference channel echo as follows:
since unmanned aerial vehicle formation is in radar far field conditions, and θ en The value of (2) is very small and therefore the following approximation is used:
P r (θ rn +θ en )P r (θ rn -θ en )≈[P r (θ r1 )] 2
P c (θ cn +θ en )P c (θ cn -θ en )≈[P c (θ c1 )] 2
P n ≈P r 2 (θ r1 )P c 2 (θ c1 )
the total pulse ratio when a platform echo is present is:
the interference gain is:
from the formula of the interference gain, it can be derived that the platform reflection echo and the interference signal will be added in the monopulse radar and the channel, while the difference channel result is unchanged, so that the interference gain is greatly reduced.
Defining the interference-signal ratio of cross-eye interference as the ratio of the sum of the amplitudes of the reflected echoes of each platform to the sum of the amplitudes of the multipath interference signals, defining a J And phi J Is that
Wherein a is J Representing the ratio of the sum of the amplitudes of all the platform reflection echo signals to the sum of the amplitudes of all the interference signals phi J Representing the ratio of the sum of the phases of all the platform reflected echo signals to the sum of the phases of all the interfering signals.
Radar powder for radar targetThe attitude sensitivity of the cross section (Radar Cross section, RCS) and the jitter in flight, the echo phase of the platform will be 0,2 pi]Internal random variation, thus assume phi J At [0,2 pi ]]Evenly distributed, the interference-to-signal ratio is according to the defined expression
The interference gain including platform echo is
When k is n Is an arbitrary constant, and when theta is uniformly distributed in the value range, the shape is as follows
Median f of f in the expression of (a) m Is that
Thus interference gain median G ctm Is that
From the interference gain median calculation formula, when jsr=1, the interference gain median G ctm Is half the cross-eye gain of the isolated echo.
The interference-to-signal ratio determines the median value G of the total cross eye gain ctm Proportional to cross-eye gain of isolated echoesMedian total cross eye gain G ctm Reflecting the distribution of the total cross eye gain, when the dry signal ratio is larger, the median value G of the total cross eye gain ctm The closer the cross-eye gain of the isolated echo is, the less the overall cross-eye gain is affected by the platform echo.
In the embodiment of the present invention, a relation between the interference signal ratio and the interference gain median is subjected to simulation experiment analysis, please refer to fig. 4, the interference gain median G ctm Monotonically increasing with the interference plus signal ratio JSR. As can be seen from the interference gain median calculation formula, when jsr=0 dB, the interference gain median G ctm Cross-eye gain G for isolating echoes c Half of (1), thus when the interference signal ratio JSR>At 20dB, the median value of interference gain G ctm Very close to isolated echo cross eye gain G c The interference signal plays a main role in monopulse and channel echo, the influence of the platform reflection echo on cross eye interference is small, and the actual cross eye interference effect can be close to that of the cross eye interference effect under the condition of no platform echo. And when the interference signal ratio JSR is larger than 20dB, the interference gain median G ctm The increase speed of the (C) is obviously slowed down, and the cross eye interference effect improved by increasing the interference signal ratio JSR is not obvious. Therefore, in order to achieve the ideal interference effect, the interference-signal ratio JSR should be more than 20dB when the cross-eye interference is actually performed.
Further, according to
Deriving
It can be known that the interference signal ratio JSR is related to the parameter value of the interference loop, and the interference parameter is the interference loop amplitude ratio and the interference loop phase difference.
In the embodiment of the invention, the interference signal ratio JSR under the interference ideal parameter of the near cross eyes is adopted to normalize the interference signal ratio JSR under different interference loop parameters to analyze the influence of the interference loop parameters on the interference signal ratio JSR, and referring to fig. 5 and 6, fig. 5 shows a 2 ＝-0.5dB，φ 2 Example graph of normalized JSR gain=175°, fig. 6 shows a 2 ＝-0.5dB，φ 2 =175° JSR contour plot, contour line is obtained for a fixed JSR gain value 1 And phi 1 A set of closed-form solutions for mismatch values, a 2 And phi 2 Taking a fixed value, and satisfying a by ideal interference parameter value for normalizing the interference signal ratio JSR 1 +a 2 ＝0dB，φ 1 +φ 2 ＝360°。
As can be seen from fig. 5, the further away from the ideal value the interference parameter of the adaptive multi-loop reverse cross-eye interference is, i.e. the more serious the interference loop amplitude ratio and phase difference mismatch are, the greater the normalized interference signal ratio JSR gain is, because the amplitude ratio and phase difference mismatch cause the interference echo amplitude in the monopulse radar and the channel to be improved.
As can be seen from FIG. 6, when a 1 And phi 1 When the mismatch value of (2) is on the contour line, the normalized JSR gain which is correspondingly higher than the ideal interference parameter value can be obtained.
Thus, by mismatch of the interfering loop amplitude ratio and the interfering loop phase difference, a higher interference-to-signal ratio can be obtained.
And S004, after the platform reflection echo moves out of the range gate, increasing the angle measurement error until the monopulse radar is out of lock.
Specific:
after the platform reflected echo signals move out of the distance wave gate, the interference signal in the distance wave gate is high, the amplitude of two paths of interference signals is modulated again, so that the self-adaptive multi-loop reverse cross eye interference obtains high cross eye gain, and the angle measurement error is increased until the monopulse radar is out of lock.
As can be seen from step S003, in order to obtain a higher interference-to-signal ratio, the interference parameters may be reasonably configured to cause the interference loop amplitude ratio and the phase difference to be mismatched, so as to increase the interference-to-signal ratio and the interference gain at the cost of reducing the cross-eye gain of the isolated echo. Therefore, for the distance-angle two-dimensional combined interference, the amplitude ratio and the phase difference of an interference loop are mismatched at the initial stage of interference, the cross eye gain is reduced, the interference-signal ratio is improved to ensure the success rate of distance towing interference, and after a radar wave gate is successfully towed, the interference parameters are adjusted to improve the cross eye interference effect.
The interference of the distance wave gate dragging can improve the interference-signal ratio of the reverse cross eye interference, increase the cross eye gain and improve the effect of angle interference, and the reverse cross eye interference can enable the distance false target to have angle information, so that the interference of the distance wave gate dragging is more difficult to distinguish.
In summary, in the embodiment of the invention, the unmanned aerial vehicle formation carrying the jammer forms the self-adaptive multi-loop reverse cross eye interference, and combines the distance wave gate interference to form the distance-angle two-dimensional combined interference, the interference units are paired according to the direction of the incoming wave signal to form an interference loop, the radar pulse is forwarded with the minimum delay time, and the distance wave gate is captured; the jammer gradually increases the forwarding delay time, so that the distance wave gate gradually deviates from the platform reflection echo, and the angle measurement error is increased; and after the platform reflection echo moves out of the range gate, the angle measurement error is continuously increased until the monopulse radar is unlocked. The embodiment of the invention can keep a more stable interference effect under any interference machine corner, can basically eliminate the influence of the platform echo when the interference-signal ratio is more than 20dB, and implements cross-eye interference under a lower interference-signal ratio.
It should be noted that: the sequence of the embodiments of the present invention is only for description, and does not represent the advantages and disadvantages of the embodiments. And the foregoing description has been directed to specific embodiments of this specification. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A co-spoofing type jamming method based on unmanned aerial vehicle formation, which is characterized by comprising the following steps:
forming an unmanned aerial vehicle formation by four unmanned aerial vehicle carrying the jammers, wherein the unmanned aerial vehicle formation is in square arrangement;
after the jammer receives radar pulses, carrying out jammer pairing on the unmanned aerial vehicle formation according to the incoming wave signal direction to form two interference loops, wherein each interference loop comprises two paired interference units to form a self-adaptive multi-loop reverse phase cross eye interference spatial configuration for the unmanned aerial vehicle formation; forwarding the radar pulse with minimum delay time, and capturing a range gate of the monopulse radar;
the interference machine gradually increases the forwarding delay time, so that the distance wave gate gradually deviates from the platform to reflect echo, the interference signal ratio in the distance wave gate is continuously increased, the interference gain is continuously increased, and the angle measurement error is increased; the interference signal ratio is the ratio of the sum of the amplitudes of all the platform reflection echoes to the sum of the amplitudes of the multipath interference signals, and the interference signal ratio and the interference gain are in positive correlation;
and after the platform reflection echo moves out of the range gate, increasing the angle measurement error until the monopulse radar is out of lock.
2. The method of claim 1, wherein the method of jammer pairing is:
according to the included angle between the incoming wave signal direction and the advancing direction of the unmanned aerial vehicle formation, the pairing of the interference units is changed, and the advancing direction of the unmanned aerial vehicle formation is any diagonal direction of a square.
3. The method according to claim 2, wherein when the angle between the incoming wave signal direction and the advancing direction of the unmanned aerial vehicle formation is 0 ° to 90 ° or-90 ° to-180 °, the pairing of the interference units is a first interference pattern, two unmanned aerial vehicles on the diagonal line as the advancing direction are respectively used as a first interference unit and a fourth interference unit, and the diagonal line is used as a dividing line, and the interference unit closest to the incoming wave signal and the interference unit on the same side of the diagonal line as the incoming wave signal are paired; the first interference loop of the first interference mode comprises a first interference unit and a second interference unit which are paired; the second interference loop of the first interference mode comprises a paired third interference unit and fourth interference unit; the first interference unit and the fourth interference unit are responsive to an external signal.
4. The method according to claim 2, wherein when the angle between the incoming wave signal direction and the advancing direction of the unmanned aerial vehicle formation is 90 ° to 180 ° or 0 ° to-90 °, the pairing of the interference units is a second interference pattern, two unmanned aerial vehicles on the diagonal line as the advancing direction are respectively used as a first interference unit and a fourth interference unit, and the diagonal line is used as a dividing line, and the interference unit closest to the incoming wave signal and the interference unit on the same side as the diagonal line are paired; the first interference loop of the second interference mode comprises a first interference unit and a third interference unit which are paired; the second interference loop of the second interference mode comprises a second interference unit and a fourth interference unit which are matched; the first interference unit and the fourth interference unit are responsive to an external signal.
5. A method according to claim 3, wherein the first interference mode is a mode of operation:
the signal received by the first interference unit is transmitted to the second interference unit after being modulated by amplitude gain and phase offset, and then transmitted by the second interference unit; the signal received by the second interference unit is directly forwarded to the first interference unit and then transmitted by the first interference unit; the signal received by the third interference unit is modulated by amplitude gain and phase offset and then forwarded to a fourth interference unit, and then transmitted by the fourth interference unit; and the signal received by the fourth interference unit is directly forwarded to the third interference unit and then transmitted by the third interference unit.
6. The method of claim 4, wherein the second interference mode is a mode of operation:
the signal received by the first interference unit is transmitted to the third interference unit after being modulated by amplitude gain and phase offset, and then transmitted by the third interference unit; the signal received by the third interference unit is directly forwarded to the first interference unit and then transmitted by the first interference unit; the signal received by the second interference unit is modulated by amplitude gain and phase offset and then forwarded to a fourth interference unit, and then transmitted by the fourth interference unit; and the signal received by the fourth interference unit is directly forwarded to the second interference unit and then transmitted by the second interference unit.
7. The method of claim 1, wherein the method of capturing the range gate is:
increasing the amplitude difference in the interference modulation direction to increase the sum channel echo of the monopulse radar to capture the range gate; the interference modulation direction is the transmission direction after the amplitude and phase modulation of the received signal in the interference loop.
8. The method of claim 1, wherein increasing the angular error after the target echo moves out of the range gate is by:
modulating the amplitude gains of the two interference loops to enable the self-adaptive multi-loop reverse cross eye interference to obtain high cross eye gain, and further increasing the angle measurement error.
9. The method according to claim 1, wherein the method for adjusting the interference-to-signal ratio is as follows: and obtaining higher interference-signal ratio by mismatching the interference loop amplitude ratio of the interference loop with the interference loop phase difference.
10. The method of claim 1, wherein the interference-to-signal ratio is greater than 20dB.
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