CN111781582A - Four-point source side cross eye interference method - Google Patents
Four-point source side cross eye interference method Download PDFInfo
- Publication number
- CN111781582A CN111781582A CN202010392478.9A CN202010392478A CN111781582A CN 111781582 A CN111781582 A CN 111781582A CN 202010392478 A CN202010392478 A CN 202010392478A CN 111781582 A CN111781582 A CN 111781582A
- Authority
- CN
- China
- Prior art keywords
- interference
- eye
- cross
- antenna
- jammer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/495—Counter-measures or counter-counter-measures using electronic or electro-optical means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/38—Jamming means, e.g. producing false echoes
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention belongs to the technical field of radar electronic countermeasure, and discloses a four-point source side direction cross eye interference method, which adopts a four-point source non-uniform planar linear array reverse antenna cross eye technology distributed on the side surface of an unmanned aerial vehicle, and realizes effective cross eye interference in a narrow and smooth space on the side surface of a flying body by a linear array antenna consisting of four non-uniformly distributed Archimedes planar spiral antennas and adopting a reverse structure; the single interference loop adopts a two-source reverse cross eye jammer structure of a receiving and transmitting single antenna; an Archimedes planar spiral antenna is adopted as a cross-eye jammer antenna; determining an interference baseline ratio of the two interference loops; carrying out cross-eye interference on the interception object-carried monopulse radar which is attacked laterally; the method is mainly used for interference on the direction-finding performance of the side-intercepting monopulse radar in the penetration, can effectively interfere the interceptors of side attack, provides effective protection for the penetration of flying objects, and provides support for the practical application of the cross-eye interference technology.
Description
Technical Field
The invention belongs to the technical field of radar electronic countermeasure, and provides a four-point source side-direction cross-eye interference method which is mainly used for preventing interference of the detection performance of a side-intercepting monopulse radar in a penetration mode.
Background
Unmanned aerial vehicles have become the main hard killing device in the battlefield, and in order to improve the anti-attack capability, effective interference is necessary to be implemented on the interceptors of side attacks.
The tracking and guidance radar generally adopts a monopulse technology and has the advantages of high angle measurement precision, strong anti-interference capability and the like. The interference monopulse radar once becomes a research hotspot and difficulty in the field of electronic warfare. The interference patterns of the monopulse radar mainly include towed decoy interference, cross polarization interference, cross eye interference and the like, wherein the cross eye interference is considered as the most effective interference pattern for interfering the monopulse radar. The cross-eye interference has the advantages of high reliability, short system response time, long effective interference time, low life cycle cost and the like, and is widely concerned by scholars at home and abroad in recent years. Cross-eye interference techniques were first proposed in 1958 and, through half or more centuries of development, are now mainly composed of two-source and multi-source cross-eye interference. With the introduction of digital radio frequency memories and inverse antenna arrays with self-phasing characteristics, cross-eye interference techniques are implemented in engineering applications. Both European typhoon fighters and Russian Su-30/32/34 fighters are reported to have cross-eye interference capability. However, the critical parameter tolerance of the two-source cross-eye interference seriously limits the practicability of the cross-eye interference technology, the number of antenna pairs is increased by adopting an array antenna structure, the degree of freedom of the cross-eye interference is improved, a gain larger than that of the traditional cross-eye interference can be obtained, and the requirement on the parameter tolerance is reduced.
The cross-eye interference technology is mainly applied to long-base-line platforms such as ground radars and airplane wings at present, the length of an installation base line is generally not less than 10m, the requirement on the type of an antenna is low, and the dynamic performance of a carrier is not affected basically. Considering that the longitudinal length of the unmanned aerial vehicle is generally short, generally about 4m, and the side surface of the unmanned aerial vehicle has strict requirements on the characteristics of the mounted antenna and cannot influence the maneuvering performance of the unmanned aerial vehicle, the currently performed cross-eye interference technology research rarely uses the side surface of the flight carrier as a mounting area. Compare in less positive radar RCS, the RCS of unmanned aerial vehicle side is great, suffers the side attack of enemy interception bullet more easily when carrying out the penetration. Aiming at the sudden prevention demand of the unmanned aerial vehicle, the research on the cross eye interference technology with characteristics of multi-source, short base line, non-uniform planar linear array distribution and the like needs to be developed urgently, and the support is provided for the application of the lateral cross eye interference technology of the unmanned aerial vehicle.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a four-point source side-direction cross eye interference method, which is a side cross eye interference technology for interfering a monopulse radar based on an unmanned aerial vehicle and is mainly used for preventing interference to the detection performance of a side interception radar in a penetration mode.
In order to achieve the purpose, the invention adopts the following technical scheme:
a four-point source side direction cross eye interference method is a four-point source non-uniform plane linear array reverse antenna cross eye method distributed on the side face of an unmanned aerial vehicle, and effective cross eye interference is achieved in a narrow and smooth space on the side face of a flying body by a linear array antenna formed by four non-uniformly distributed Archimedes plane spiral antennas and adopting a reverse structure; the specific implementation steps are as follows:
the method comprises the following steps: the single interference loop adopts a two-source reverse cross eye interference machine structure of a receiving and transmitting single antenna; the reverse cross-eye jammer is a cross-eye jammer adopting a reverse antenna structure, a reverse antenna array consists of a plurality of paired antennas, and signals are transmitted in two directions; the reverse antenna has the self-phase-adjusting characteristic and has two paths of interference signals with approximately equal amplitude and opposite phase; the reverse antenna has a phase difference exceeding the tolerance of system parameters in a self-compensating interference loop, and the adoption of the reverse antenna array is a necessary condition of a cross-eye jammer;
the four-source non-uniform planar linear array inverse cross eye jammer is provided with two jamming loops, and a single jamming loop adopts a two-source inverse cross eye jammer structure of a transmitting and receiving single antenna; the two paths of interference signals pass through the same transceiving antenna, circulator, feeder line, component and feeder line, and the power attenuation and phase delay introduced by the feeder line do not affect the parameter matching between the two paths of interference signals, so the length of the feeder line is selected at will;
step two: an Archimedes planar spiral antenna is adopted as a cross-eye jammer antenna; the cross-eye interference is implemented in a narrow and smooth space of the side surface of the unmanned aerial vehicle, the type selection and the arrangement of cross-eye interference machine antennas are faced, the requirement of isolation between the antennas is ensured to reduce mutual interference, a larger interference loop baseline ratio is required to obtain large cross-eye interference gain, and meanwhile, the antennas also have a planar characteristic, so that the antennas are convenient to mount on the side surface of the unmanned aerial vehicle and do not influence the maneuvering characteristic of a carrier; the cross-eye jammer antenna adopts an Archimedes planar spiral antenna, has wide frequency band, circular polarization, small size and convenient embedding in the frequency band range of 100 MHz-50 GHz, and has stable directional diagram, axial ratio and input impedance in the frequency band;
step three: determining an interference baseline ratio of the two interference loops; the interference loop baseline ratio is the ratio of the lengths of the interference loop 2 baseline and the interference loop 1 baseline, and the ratio is not more than 1; the interference loop baseline ratio reflects the nonlinear distribution condition of array elements in a linear array, and the four-source back cross eye gain is as follows:
wherein, F2Is the interference loop baseline ratio; the factor influencing the gain from the expression of the cross-eye gain is the interference loop baseline ratio; the length of the base line of the interference loop 2 is arbitrarily valued within the total base line length; according to the cross eye gain formula, under the condition of the determined signal amplitude phase relation, the larger the interference loop baseline ratio is, the larger the cross eye gain is, the linear relation is formed between the interference loop baseline ratio and the cross eye gain, and the parameter tolerance of the interference machine is looser at the moment;
for an Archimedes planar helical antenna, the relationship between the antenna aperture and the operating frequency band is taken as dp2.5 λ; due to Archimedes spiral antennaWhen kd > 1 is satisfied, the distance between the edges of two adjacent antennas is required to be greater than 10 times of lambda/(2 pi), and then the minimum setting distance between the center points of the adjacent antennas is:
according to the obtained minimum setting distance of the antenna, two important conclusions are obtained, namely, the minimum setting distance of adjacent antennas is 3 times of wavelength of the unmanned aerial vehicle four-source non-uniform linear array inverted cross eye jammer adopting the Archimedes spiral antenna; secondly, the maximum interference baseline ratio adopted by the interference machine is as follows:
wherein d is2maxLongest base line value used for interference loop 2, dcIs the baseline length of the jammer antenna array, i.e. the baseline value of the jammer loop 1.
Step four: carrying out cross-eye interference on a laterally incoming interception missile-borne monopulse radar; in the stage of the sudden defense of the unmanned aerial vehicle, when the unmanned aerial vehicle is irradiated by a single-pulse radar loaded by intercepting bullets which are attacked laterally, the cross-eye jammers interfere the single-pulse radar. The four-source non-uniform planar linear array inverse cross eye jammer can effectively interfere with a monopulse radar by requiring two interference signals with approximately equal amplitudes and opposite phases, the amplitude ratio of the two interference signals in each interference loop is controlled within the range of 0.8-1.2, and the phase difference is controlled within the range of 170-190 degrees, so that errors are generated in angle measurement of the phase and difference monopulse radar, and even a target is unlocked.
Due to the adoption of the technical scheme, the invention has the following advantages:
the invention adopts two interference signals of the four-source non-uniform planar linear array inverse cross eye jammer with approximately equal amplitudes and opposite phases to effectively interfere the monopulse radar, controls the amplitude ratio of the two interference signals in each interference loop within the range of (0.8,1.2), controls the phase difference within the range of (170 degrees and 190 degrees), causes errors in the angle measurement of the phase difference monopulse radar and the phase difference monopulse radar, even loses lock on a target, cannot give accurate aircraft angle information, cannot effectively defend an oncoming aircraft, and thus realizes the purpose of effectively defending an active penetration of a protective flying object.
The invention can be applied to unmanned aerial vehicle self-defense interference equipment, can effectively interfere intercepting bullets attacked from the side surface, provides effective protection for unmanned aerial vehicle penetration, and provides support for the practical application of the cross-eye interference technology.
Drawings
Fig. 1 is a schematic view of a drone structure.
Fig. 2 is a schematic diagram of a drone-based lateral cross-eye jammer.
Figure 3 is a two source, inverted cross-eye jammer transceiver single antenna configuration.
Figure 4 is a graph of a four-source non-uniform planar linear array inverse cross eye interference schematic.
FIG. 5 is a typical value (a) for an interference baseline ratio of 0.941,φ1) Loop 2 parameter (a)2175 deg. versus radar angle measurement error, induced offset distance due to cross-eye interference.
FIG. 6 is a typical value (a) for an interference baseline ratio of 0.941,φ1) Loop 2 parameter (0.95, phi)2) And radar angle measurement error and induced deviation distance caused by cross eye interference are shown in the relation curve.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 6, a four-point source non-uniform planar linear array reverse antenna cross-eye technology distributed on the side surface of an unmanned aerial vehicle adopts a linear array antenna composed of four non-uniformly distributed archimedes planar spiral antennas, the antenna adopts a reverse structure, and effective cross-eye interference is realized in a narrow and smooth space on the side surface of the unmanned aerial vehicle. The specific implementation steps are as follows:
the method comprises the following steps: the single interference loop adopts a two-source reverse cross eye interference machine structure of a receiving and transmitting single antenna;
the reverse cross-eye jammer is a cross-eye jammer adopting a reverse antenna structure, a reverse antenna array consists of a plurality of paired antennas, and signals are transmitted in two directions; the reverse antenna has the self-phase-adjusting characteristic, and has two paths of interference signals with approximately equal amplitudes and opposite phases. The reverse antenna has a phase difference in the self-compensating interference loop that exceeds the tolerance of the system parameters, and the adoption of the reverse antenna array is a necessary condition of the cross-eye jammer.
The four-source non-uniform planar linear array inverse cross eye jammer is provided with two jamming loops, and a single jamming loop adopts a two-source inverse cross eye jammer structure of a transmitting and receiving single antenna; the two interference signals are subjected to power attenuation and phase delay introduced by the same transceiving antenna, circulator, feeder, component and feeder, and do not affect the parameter matching between the two interference signals, so that the length of the feeder can be selected at will.
Step two: an Archimedes planar spiral antenna is adopted as a cross-eye jammer antenna;
the cross-eye interference is implemented in a narrow and smooth space on the side face of the unmanned aerial vehicle, the main problems to be faced are the problems of type selection and arrangement of cross-eye interference machine antennas, the isolation degree between the antennas is required to be ensured so as to reduce mutual interference, a larger interference loop baseline ratio is required to be provided for obtaining large cross-eye interference gain, and meanwhile, the antennas also have a plane characteristic, so that the cross-eye interference machine antennas can be conveniently installed on the side face of the unmanned aerial vehicle and the maneuvering characteristic of a carrier is not influenced. The cross-eye jammer antenna adopts an Archimedes planar helical antenna, has wide frequency band, circular polarization, small size and convenient embedding in the frequency band range of 100 MHz-50 GHz, has stable direction diagram, axial ratio and input impedance in the frequency band, and meets the use requirements of the cross-eye jammer antenna.
Step three: determining an interference baseline ratio of the two interference loops;
the interference loop baseline ratio is the ratio of the lengths of the interference loop 2 baseline and the interference loop 1 baseline, and the ratio is not more than 1; the interference loop baseline ratio reflects the nonlinear distribution condition of array elements in a linear array, and the four-source back cross eye gain is as follows:
wherein, F2Is the interference loop baseline ratio; the factor influencing the gain from the expression of the cross-eye gain is the interference loop baseline ratio; the length of the base line of the interference loop 2 is arbitrarily valued within the total base line length; according to the cross eye gain formula, under the condition of the determined signal amplitude phase relation, the larger the interference loop baseline ratio is, the larger the cross eye gain is, the linear relation is formed between the interference loop baseline ratio and the cross eye gain, and the parameter tolerance of the interference machine is looser at the moment;
for an Archimedes planar helical antenna, the relationship between the antenna aperture and the operating frequency band is taken as dp2.5 λ. Since the Archimedes spiral antenna is a circular planar antenna, when kd > 1 is satisfied, the distance between two adjacent antenna edges is required to be greater than 10 times of λ/(2 π), and then the minimum distance between the center points of the adjacent antennas is:
according to the obtained minimum setting distance of the antenna, two important conclusions are obtained, namely, the minimum setting distance of adjacent antennas is 3 times of wavelength of the unmanned aerial vehicle four-source non-uniform linear array inverted cross eye jammer adopting the Archimedes spiral antenna; secondly, the maximum interference baseline ratio adopted by the interference machine is as follows:
wherein d is2maxLongest base line value used for interference loop 2, dcIs the baseline length of the jammer antenna array, i.e. the baseline value of the jammer loop 1.
Step four: carrying out cross-eye interference on a laterally incoming interception missile-borne monopulse radar;
in the stage of the sudden defense of the unmanned aerial vehicle, when the unmanned aerial vehicle is irradiated by a single-pulse radar loaded by intercepting bullets which are attacked laterally, the cross-eye jammer interferes the unmanned aerial vehicle. Four-source non-uniform planar linear array back-crossing-eye jammers need two paths of interference signals with approximately equal amplitudes and opposite phases to effectively interfere monopulse radars, the amplitude ratio of the two paths of interference signals in each interference loop is controlled within a (0.8,1.2) range, the phase difference is controlled within a (170 DEG, 190 DEG) range, so that the phase and the angle measurement of the monopulse radars have errors, even the target is unlocked, accurate angle information of an unmanned aerial vehicle cannot be given, the unmanned aerial vehicle cannot effectively defend against an oncoming aircraft, and the purpose of effectively protecting the unmanned aerial vehicle from sudden attack is achieved.
The four-point source non-uniform planar linear array reverse antenna cross eye technology distributed on the side face of the unmanned aerial vehicle realizes effective cross eye interference in narrow and smooth space on the side face of a flying body by adopting a linear array antenna consisting of four non-uniformly distributed Archimedes planar spiral antennas and adopting a reverse structure. Fig. 1 is a schematic structural diagram of a flight vehicle.
Fig. 1 shows a schematic view of the structure of the unmanned aerial vehicle. The length of the unmanned aerial vehicle is generally about 4m, and the diameter is generally within 1 m. The cross-eye jammer can be arranged at two positions, namely, a forward circular section of the unmanned aerial vehicle is generally arranged in a head radome of the unmanned aerial vehicle and is used for interfering a radar in the forward looking direction; the other is an unmanned side surface which is used for interfering a detection radar in a side-looking direction and an interceptor of a side-attacking. Aiming at the second condition, the invention carries out cross-eye interference on the monopulse detection radar in the side-view direction.
Fig. 2 is a schematic diagram of a drone-based lateral cross-eye jammer. The interference machine comprises two interference loops, four sources in total, and the feeder lines of the two interference loops are the same in length. The Archimedes planar spiral antenna is used as a single receiving antenna and a single transmitting antenna, and the four interference machine antennas are distributed on the side face of the unmanned aerial vehicle and are in linear non-uniform distribution.
Figure 3 is a two source, inverted cross-eye jammer transceiver single antenna configuration. A single loop of the lateral cross-eye interference unit based on the unmanned aerial vehicle adopts a two-source reverse cross-eye interference unit structure for transmitting and receiving a single antenna. The two interference signals do not influence the parameter matching between the two interference signals through the power attenuation and the phase delay introduced by the same transceiving antenna, the circulator, the feeder line, the components and the feeder line, so the length of the feeder line can be arbitrarily selected. The interference machine with the structure has higher requirement on the transmitting and receiving isolation of the circulator, but is more suitable for practical application due to the excellent consistency characteristic.
Figure 4 is a graph of a four-source non-uniform planar linear array inverse cross eye interference schematic. The jammer is composed of 4 array elements, the antenna array elements 1 and 4 form a group of transceiving antenna pairs called as an interference loop 1, and the antenna array elements 2 and 3 form an interference loop 2. The signal flow of the interference loop 1 is as follows: the radar signal received by the antenna array element 1 is modulated by the signal and is sent out by the antenna array element 4; the radar signal received by the antenna array element 4 is sent out by the antenna array element 1 after modulation, and the signal flow of the interference loop 2 is the same as the signal flow. r is the distance from the center of the radar antenna to the center of the jammer, namely the interference distance; dpIs a phase comparison monopulse radar antenna aperture; thetarThe turning angle of the radar visual axis relative to the center of the jammer, namely a radar turning angle; thetacThe turning angle of the jammer relative to the center of the radar, namely the turning angle of the jammer; thetaeThe half opening angle of the jammer antenna array relative to the radar sight line; theta2Is the half opening angle of the interference loop 2 relative to the radar line of sight; dcIs the length of the antenna array base line of the jammer; d2Is the interference loop 2 array element interval. In order to ensure that the lengths of the feeders of each loop are equal in the reverse structure of the antenna array, the existing documents are basically researched based on the equal-interval distribution of the array elements, but the equal interval of the array elements is difficult to ensure in practical use, and the non-uniformly distributed linear arrays have practical application value. The monopulse radar adopts a sum-difference angle measurement system, a sum channel is used for transmitting signals and receiving signals and normalizing echoes of a difference channel, and the difference channel is used for receiving the echoes and generating error signals.
Defining a factor F2＝d2/dcIs the interference loop baseline ratio, the physical meaning is the ratio of the interference loop 2 baseline to the total antenna array baseline length, and F2Less than or equal to 1. The interference loop baseline ratio reflects the nonlinear distribution condition of array elements in a linear array, and the interference performance of a cross-eye jammer can be influenced.
According to the interference scenario shown in fig. 4, the monopulse processor normalizes the difference channel echo using the sum channel echo, and derives the monopulse ratio as:
wherein
In order to take the imaginary part of the operation,
for the operation of the real part, P1、P2As a function of the jammer antenna beam, A1、A2Is an amplitude phase variable, ks1、kc1、ks2、kc2Is a wavelength and angle variable.
Single pulse indicating angle thetaiCan be obtained from the following relation:
theta when monopulse radar tracks a targeti＝θr(ii) a Theta when cross eye interference is presenti≠θr。
The cross eye gain is an important index for measuring the angle measurement error, and the four-source reverse cross eye gain is defined as follows:
since four array elements correspond to two interference loops, the gain is Gc2. The single pulse ratio can be expressed as:
the first term of the single pulse ratio formula represents the beacon, indicating the truth of the targetThe real angle and the second term are single-pulse angle measurement errors introduced by cross-eye interference. As can be seen from equation (7), the magnitude of the angle measurement error and the cross-eye gain Gc2And half field angle theta of interference antennaeIt is related. ThetaeIs determined by the length of the antenna base line of the jammer, and theta is determined after the length of the base line is determined according to the use requirementeIs a fixed value. Therefore, the magnitude of the angle measurement error depends on the cross-eye gain.
Fig. 5 is a graph showing a relationship between a monopulse radar angle measurement error and a decoy distance due to unmanned-aerial-vehicle-based lateral cross-eye interference and an amplitude ratio of the interference loop 2 when the interference baseline ratio is 0.94 and the interference loop 1 parameter is a typical value, and fig. 6 is a graph showing a relationship between a monopulse radar angle measurement error and a decoy distance due to unmanned-aerial-vehicle-based lateral cross-eye interference and a phase difference of the interference loop 2 when the interference baseline ratio is 0.94 and the interference loop 1 parameter is a typical value. The length of the penetration unmanned aerial vehicle is generally about 4m, and the base length d of the jammer antenna array is set in simulationcAnd the working wavelength is 3m, and when the radar working at the frequency point of 10GHz in the X band is interfered, the working wavelength of the interference machine is lambda which is 0.03 m. The distance between the cross-eye jammer and the monopulse radar is 1km, and the jammer and the radar are just opposite to thetar＝θ c0 deg.. Under the condition, the maximum interference baseline ratio F of the interference machine can be calculated2max＝(dc-6λ)/dc＝0.94。
Fig. 5 and fig. 6 show the single pulse radar angle measurement error and induced deviation distance brought by the unmanned aerial vehicle-based lateral cross-eye jammer. It can be seen from the figure that within the large parameter tolerance range of the amplitude ratio (0.8,1.2) and the phase difference (170 °,190 °), the cross-eye interference can cause the angle measurement error of the monopulse radar to reach more than 1 °, and the induced offset distance to reach more than 17.5m, which is very significant for the unmanned aerial vehicle with the length generally within 4 m.
Claims (1)
1. A four-point source side cross eye interference method is characterized in that: the method adopts a four-point source non-uniform planar linear array reverse antenna cross eye method distributed on the side surface of an unmanned aerial vehicle, and realizes effective cross eye interference in a narrow and smooth space on the side surface of a flying object by a linear array antenna consisting of four non-uniformly distributed Archimedes planar spiral antennas and adopting a reverse structure; the specific implementation steps are as follows:
the method comprises the following steps: the single interference loop adopts a two-source reverse cross eye interference machine structure of a receiving and transmitting single antenna; the reverse cross-eye jammer is a cross-eye jammer adopting a reverse antenna structure, a reverse antenna array consists of a plurality of paired antennas, and signals are transmitted in two directions; the reverse antenna has the self-phase-adjusting characteristic, and has two paths of interference signals with approximately equal amplitude and opposite phase; the reverse antenna has a phase difference exceeding the tolerance of system parameters in a self-compensating interference loop, and the adoption of the reverse antenna array is a necessary condition of a cross-eye jammer;
the four-source non-uniform planar linear array inverse cross eye jammer is provided with two jamming loops, and a single jamming loop adopts a two-source inverse cross eye jammer structure of a transmitting and receiving single antenna; the two paths of interference signals are subjected to power attenuation and phase delay introduced by the same transceiving antenna, circulator, feeder line, component and feeder line, and the parameter matching between the two paths of interference signals is not influenced, so that the length of the feeder line is selected at will;
step two: an Archimedes planar spiral antenna is adopted as a cross-eye jammer antenna; the cross-eye interference is implemented in a narrow and smooth space on the side surface of the unmanned aerial vehicle, the type selection and arrangement of cross-eye interference machine antennas are faced, the isolation degree between the antennas is required to be ensured so as to reduce mutual interference, a larger interference loop baseline ratio is required to be provided for obtaining large cross-eye interference gain, and meanwhile, the antennas also have a planar characteristic, so that the cross-eye interference machine antennas are convenient to install on the side surface of the unmanned aerial vehicle and do not influence the maneuvering characteristic of a carrier; the cross-eye jammer antenna adopts an Archimedes planar spiral antenna, has wide frequency band, circular polarization, small size and convenient embedding in the frequency band range of 100 MHz-50 GHz, and has stable directional diagram, axial ratio and input impedance in the frequency band;
step three: determining an interference baseline ratio of the two interference loops; the interference loop baseline ratio is the ratio of the lengths of the interference loop 2 baseline and the interference loop 1 baseline, and the ratio is not more than 1; the interference loop baseline ratio reflects the nonlinear distribution condition of array elements in a linear array, and the four-source back cross eye gain is as follows:
wherein, F2Is the interference loop baseline ratio; the factor influencing the gain from the expression of the cross-eye gain is the interference loop baseline ratio; the length of the base line of the interference loop 2 is arbitrarily valued within the total base line length; according to the gain formula of the cross eye, under the condition of the determined signal amplitude phase relation, the larger the interference loop baseline ratio is, the larger the cross eye gain is, the linear relation is formed between the interference loop baseline ratio and the cross eye gain, and the parameter tolerance of the interference machine is looser at the moment;
for an Archimedes planar helical antenna, the relationship between the antenna aperture and the operating frequency band is taken as dp2.5 λ; since the Archimedes spiral antenna is a circular planar antenna, when kd > 1 is satisfied, the distance between two adjacent antenna edges is required to be greater than 10 times of λ/(2 π), and then the minimum distance between the center points of the adjacent antennas is:
according to the obtained minimum setting distance of the antenna, two important conclusions are obtained, namely, the four-source non-uniform linear array inverse cross eye interference machine of the unmanned aerial vehicle adopting the Archimedes spiral antenna is adopted, and the minimum setting distance of adjacent antennas is 3 times of wavelength; secondly, the maximum interference baseline ratio adopted by the interference machine is as follows:
wherein d is2maxLongest base line value used for interference loop 2, dcThe length of a base line of the jammer antenna array is the base line value of the jammer loop 1;
step four: carrying out cross-eye interference on a laterally incoming interception missile-borne monopulse radar; in the stage of the penetration of the unmanned aerial vehicle, when the unmanned aerial vehicle is irradiated by a single-pulse radar loaded by a laterally incoming interception bomb, the cross-eye jammer interferes the unmanned aerial vehicle; the four-source non-uniform planar linear array inverse cross eye jammer can effectively interfere with a monopulse radar by requiring two interference signals with approximately equal amplitudes and opposite phases, the amplitude ratio of the two interference signals in each interference loop is controlled within the range of 0.8-1.2, and the phase difference is controlled within the range of 170-190 degrees, so that errors are generated in angle measurement of the phase and difference monopulse radar, and even a target is unlocked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010392478.9A CN111781582A (en) | 2020-05-11 | 2020-05-11 | Four-point source side cross eye interference method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010392478.9A CN111781582A (en) | 2020-05-11 | 2020-05-11 | Four-point source side cross eye interference method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111781582A true CN111781582A (en) | 2020-10-16 |
Family
ID=72753516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010392478.9A Pending CN111781582A (en) | 2020-05-11 | 2020-05-11 | Four-point source side cross eye interference method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111781582A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567938A (en) * | 2021-07-27 | 2021-10-29 | 戴幻尧 | Cross eye interference system based on polarization adaptive measurement and generation method |
| CN114755638A (en) * | 2022-04-20 | 2022-07-15 | 扬州宇安电子科技有限公司 | Target protection system and method with angle deception function |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444816A (en) * | 2018-10-12 | 2019-03-08 | 中国人民解放军63892部队 | Monopulse radar Cross-eye interference detection method based on accessory channel |
| CN111427015A (en) * | 2020-04-02 | 2020-07-17 | 中国人民解放军63892部队 | Four-source non-uniform linear array inverse cross eye interference method based on flight carrier |
-
2020
- 2020-05-11 CN CN202010392478.9A patent/CN111781582A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444816A (en) * | 2018-10-12 | 2019-03-08 | 中国人民解放军63892部队 | Monopulse radar Cross-eye interference detection method based on accessory channel |
| CN111427015A (en) * | 2020-04-02 | 2020-07-17 | 中国人民解放军63892部队 | Four-source non-uniform linear array inverse cross eye interference method based on flight carrier |
Non-Patent Citations (1)
| Title |
|---|
| 刘天鹏: ""多源反向交叉眼干扰技术研究"", 《中国博士学位论文全文数据库信息科技辑》, pages 136 - 11 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567938A (en) * | 2021-07-27 | 2021-10-29 | 戴幻尧 | Cross eye interference system based on polarization adaptive measurement and generation method |
| CN113567938B (en) * | 2021-07-27 | 2023-08-25 | 中国人民解放军63892部队 | Cross eye interference system based on polarization self-adaptive measurement and generation method |
| CN114755638A (en) * | 2022-04-20 | 2022-07-15 | 扬州宇安电子科技有限公司 | Target protection system and method with angle deception function |
| CN114755638B (en) * | 2022-04-20 | 2022-11-11 | 扬州宇安电子科技有限公司 | Target protection system and method with angle deception function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Odendaal et al. | Tolerance analysis of cross-eye jamming systems | |
| Du Plessis | Platform skin return and retrodirective cross-eye jamming | |
| Liu et al. | Performance analysis of multiple-element retrodirective cross-eye jamming based on linear array | |
| Butt et al. | An overview of electronic warfare in radar systems | |
| CN109444816A (en) | Monopulse radar Cross-eye interference detection method based on accessory channel | |
| Neng-Jing | Radar ECCMs new area: anti-stealth and anti-ARM | |
| CN111781582A (en) | Four-point source side cross eye interference method | |
| Balajti et al. | Increased importance of VHF radars in ground-based air defense | |
| Liu et al. | Multiple-element retrodirective cross-eye jamming against amplitude-comparison monopulse radar | |
| Rim et al. | Survivability simulation of airborne platform with expendable active decoy countering RF missile | |
| Skolnik | Systems aspects of digital beam forming ubiquitous radar | |
| CN111427015A (en) | Four-source non-uniform linear array inverse cross eye interference method based on flight carrier | |
| Gang et al. | Identification of chaff interference based on polarization parameter measurement | |
| Shoykhetbrod et al. | A scanning FMCW-radar system for the detection of fast moving objects | |
| Matuszewski | Jamming efficiency of land-based radars by the airborne jammers | |
| KR20140120210A (en) | Radar system for continuous tracking of multiple objects | |
| Jenn | Radar fundamentals | |
| Gaoqian et al. | Radar netting technology & its development | |
| CN114814739A (en) | Main lobe interference suppression method based on distributed FDA-MIMO radar | |
| Cheng et al. | Analysis of performance of shipborne cross-eye jamming against anti-ship missile | |
| Deng et al. | Frequency diverse arc array beampattern synthesis analysis with nonlinear frequency offset | |
| RU2586819C1 (en) | Method of striking target producing coherent interference with missiles fitted with active radar seekers | |
| Lim et al. | Jamming effect of stand-off jammer to main lobe of LPI radar | |
| Zhang et al. | Study on composite electromagnetic scattering characteristics of air-floating corner reflector and chaff | |
| Zhang et al. | Jamming Against Pulse Compression Radar |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |