CN113009427A - Multi-domain agility anti-interference method for phased array radar - Google Patents
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Abstract
The invention relates to a multi-domain agility anti-interference method for a phased array radar. The invention relates to the technical field of radars, in particular to a multi-domain agility anti-interference method for a phased array radar, which comprises the steps of firstly obtaining relevant interference information by utilizing a reconnaissance channel of the radar, then carrying out full agility scanning according to a beam scanning area, adopting an agility mode during radar scanning, then adopting agility and waveform agility on each wave position for working, possibly carrying out parameter agility on working parameters, and finally storing real waveforms and parameters for being used as transmitting signals and receiving matching signals of the radar; the anti-interference method adopts a multi-domain agile mode such as airspace, frequency domain, waveform domain, parameter domain and the like to perform anti-interference, has the capability of simultaneously inhibiting composite interference such as deception, suppression and the like, overcomes the defect that a radar working mode and signals are easy to detect interference, and has the advantages of multi-style composite interference resistance and large interference quantity. The invention can be used for various phased array radar systems, is simple to realize and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of radars, in particular to a multi-domain agility anti-interference method for a phased array radar.
Background
Phased array radar is an important direction for the development of modern radars and is widely applied to the fields of military and civil use. Compared with a mechanically scanned radar, the phased array radar has the advantages of flexible pointing, reconfigurable performance and the like, is easy to realize multi-beam and multi-function, and has wide application prospect.
However, with the rapid development of modern electronic technology, the interference technology for phased array radar is also developing at a constant rapid speed. Through recent countermeasures, it can be seen that some of the disadvantages of phased array radars have also begun to be exposed. The phase-controlled radar has good anti-sidelobe interference capability due to the multi-channel characteristic, but main lobe interference easily causes main lobe distortion, so that interference suppression cannot be realized. However, in modern wars, shield type interference, concomitant type interference and self-defense type interference appear in a large amount, and meanwhile, interference opportunities are matched with interference patterns such as noise suppression, deception and forwarding slicing to interfere the radar together, so that the operational efficiency of the phased array radar is greatly reduced or fails. As can be seen from the above analysis, the interference is various and has various combination modes, and it is not feasible to perform interference resistance by means of interference identification. In addition, in the practical application process, the battlefield situation is complex and changeable, and a large amount of data analysis cannot be performed in time to find out an effective means for dealing with the current interference.
Disclosure of Invention
Therefore, the invention provides a multi-domain agility anti-interference method for a phased array radar. By carrying out multi-domain agility on available means such as radar airspace, frequency domain, waveform domain and parameter domain, the reconnaissance of enemies is destroyed, and the enemies cannot predict the working mode, frequency and parameters of the radar at the next moment, so that the aim of effectively inhibiting multi-style composite interference is fulfilled. The method comprises the following steps: acquiring relevant interference information by using a reconnaissance channel of a radar; then, according to the selection of the beam scanning area, carrying out full agility scanning; a frequency agile mode is adopted during radar scanning; working on each wave position by adopting a frequency agility mode and a wave agility mode; parameter agility is also performed on the selection of the working parameters; and finally, storing the real waveform and the parameters for being used as a transmitting signal and a receiving matching signal of the radar. At the moment, the phased array radar is in a agile process in an airspace, a frequency domain, a waveform domain, a parameter domain and the like, so that the reconnaissance of enemies is destroyed, the radar has the capability of simultaneously inhibiting composite interference such as deception, suppression, main and side lobes and the like, and has the advantages of multi-mode composite interference resistance and large interference quantity. The method is used for solving the problem that the phased array radar battle efficiency is greatly reduced or fails due to the fact that a large amount of data analysis cannot be carried out due to the fact that the interference types are various, the combination patterns are various and the battlefield situation is complex and changeable in the prior art.
In order to achieve the above object, the present invention provides a multi-domain agile anti-interference method for a phased array radar, which is characterized by comprising:
step a: extracting the information of the interfered airspace and time-frequency domain through a phased radar reconnaissance channel;
step b: determining a scanning airspace through the wave beam of the phase-controlled radar;
step c: performing fully agile scanning on the airspace at different periods through the phase-controlled radar;
step d: scanning a space domain at different wave positions by the phase control radar at the working frequency of the frequency agility;
step e: transmitting pulses to an airspace in a frequency agile manner by the phase control radar according to the frequency agile pulse frequency and the waveform agility;
step f: when the transmitting pulse frequency and the waveform are determined, the phase-controlled radar carries out parameter agility;
step g: storing the agile time information of steps c-f in a memory for use as a transmit signal and a receive match signal for the phase-controlled radar.
Further, comprising: in the step a, the spatial domain information of the interference extracted by the reconnaissance channel comprises an angle and a waveform, and the time-frequency domain information comprises time width, frequency and power;
further, in the step b, the scanning space includes a full space or a partial space, a scanning area for scanning the partial space is determined by a user, and a scanning area [ θ ] is setL,θH]And a scanning interval Δ θ for dividing the wave position of the phase-controlled radar.
Further, in the step c, the full agile scan is a sequential scan or a partial agile scan, wherein the sequential scan refers to an angular sequence from θLTo thetaHPerforming continuous scanning, wherein the partial agility scanning refers to performing full agility scanning only in a designated area, other areas are sequential scanning, and the full agility scanning in the airspace is performed in [ theta ]L，θL+Δθ,…,θH-Δθ,θH]And selecting specific wave positions by random numbers within the range of the angle values to perform traversal scanning, wherein each angle is selected only once.
Further, in the step d, the frequency agility is a fixed frequency or a partial frequency agility, where the fixed frequency refers to that the frequency of each angle of the radar does not change when the radar scans the beam, the partial frequency agility refers to that the frequency agility is performed in a specified area, other areas work with the fixed frequency, the frequency values of the phase-controlled radar working at different wave positions with the frequency agility randomly change, and the change range is determined by the working frequency band of the radar and the scout channel information.
Further, in the step e, the waveform is changed to randomly select one of a fixed pulse signal, a chirp signal, a non-chirp signal, a phase-coded signal and a mixed-coded signal in a waveform library.
Further, the waveform is changed into a fixed waveform or a part of waveform, wherein the fixed waveform means that the waveform of the phase-controlled radar does not change when in work, the part of waveform means that the radar carries out waveform agility in a specified area when in work, and other ranges adopt fixed waveform work.
Further, in the step f, the parameters are agile to randomly select pulse parameters when determining the pulse frequency and the pulse waveform, the pulse parameters include pulse width, modulation mode and repetition period, and the agile range of the parameters is determined by the working parameters of the phase-controlled radar and the scout channel information together.
Further, the parameter agility is fixed parameters or part of parameter agility, wherein the fixed parameters refer to that the parameters of the radar do not change when the radar works, the part of parameters refer to waveform parameters in a designated area when the radar works, and the other areas adopt fixed waveform parameters.
Further, in the step g, the information of the agility time includes a space domain, a frequency domain, a waveform domain and a parameter domain.
Compared with the prior art, the radar target detection method has the advantages that the scanning mode of the radar is difficult to obtain by the reconnaissance machine of the enemy through the full agile scanning of the airspace, the deceptive interference cannot be carried out, the suppression interference of a large amount of consumed energy can only be carried out, the working frequency information of the radar is obtained by the reconnaissance machine through the full agile scanning and the agile frequency conversion working modes, the enemy can only use low-efficiency broadband interference and cannot carry out aiming interference, the reconnaissance of the enemy is further destroyed through the waveform agile and the parameter agile, radar signals are effectively hidden, the object of the enemy is found, the self radar is guaranteed not to be interfered, the degree of freedom of the radar array is expanded through the multi-domain phased control technology of the airspace, the frequency domain, the waveform domain, the parameter domain and the like, and the suppression of the interference of the number of multi-domain channels.
Furthermore, the reconnaissance channel extracts the information of airspace and time-frequency domain such as angle, waveform, time width, frequency and power of interference, the analysis of the phase-controlled radar on the interference is improved, the anti-interference performance of the radar is further improved, and the fighting efficiency of the radar is further improved.
Furthermore, the complexity of interference analysis is reduced and the anti-interference performance of the radar is further improved by further determining the scanning airspace, so that the fighting efficiency of the radar is further improved.
Furthermore, by adopting the full agility scanning of airspace, the scanning mode of acquiring the radar by the scout of an enemy becomes difficult, deceptive interference cannot be carried out, and only suppression interference with a large amount of consumed energy can be carried out, so that the anti-interference performance of the radar is further improved, and the fighting efficiency of the radar is further improved.
Furthermore, by adopting the full agility scanning and agility frequency conversion working modes, the working frequency information of the radar obtained by the reconnaissance plane is further increased, so that an enemy can only use low-efficiency broadband interference but cannot perform aiming type interference, the anti-interference performance of the radar is further improved, and the radar combat efficiency is further improved.
Furthermore, by randomly selecting the fixed pulse signals, the linear frequency modulation signals, the non-linear frequency modulation signals, the phase coding signals and the mixed coding signals in the waveform library, the diversity of the signals is increased, so that the enemy scout cannot determine the working frequency signals of the radar, the anti-interference performance of the radar is further improved, and the fighting efficiency of the radar is further improved.
Furthermore, by adopting waveform agility and parameter agility to further destroy the reconnaissance of enemies, radar signals are effectively hidden, the enemy targets are found while the enemy targets are ensured not to be interfered, the anti-interference performance of the radar is further improved, and the radar combat efficiency is further improved.
Furthermore, the degree of freedom of the phased array radar is expanded through multi-domain agility technologies such as airspace, frequency domain, waveform domain and parameter domain, so that the suppression of interference which is more than the number of channels can be realized, the anti-interference performance of the radar is further improved, and the fighting efficiency of the radar is further improved.
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FIG. 1 is a flow chart of a multi-domain agility anti-interference method for a phased array radar according to the present invention;
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 shows a flowchart of a multi-domain agile anti-interference method for a phased array radar according to the present invention. The phased array radar multi-domain agility anti-interference method provided by the embodiment of the invention comprises the following steps:
step a: extracting the information of the interfered airspace and time-frequency domain through a phased radar reconnaissance channel;
step b: determining a scanning airspace through the wave beam of the phase-controlled radar;
step c: performing fully agile scanning on the airspace at different periods through the phase-controlled radar;
step d: scanning a space domain at different wave positions by the phase control radar at the working frequency of the frequency agility;
step e: transmitting pulses to an airspace in a frequency agile manner by the phase control radar according to the frequency agile pulse frequency and the waveform agility;
step f: when the transmitting pulse frequency and the waveform are determined, the phase-controlled radar carries out parameter agility;
step g: storing the agile time information of steps c-f in a memory for use as a transmit signal and a receive match signal for the phase-controlled radar.
Specifically, the scanning mode of the radar is difficult to obtain by a reconnaissance machine of an enemy through full agile scanning of the airspace, deceptive interference cannot be carried out, suppression interference of a large amount of consumed energy can only be carried out, further, the reconnaissance machine is increased to obtain the working frequency information of the radar through the full agile scanning and agile frequency conversion working modes, so that the enemy can only use low-efficiency broadband interference and cannot carry out aiming interference, reconnaissance of the enemy is further destroyed through waveform agile and parameter agile, radar signals are effectively hidden, the radar is guaranteed not to be interfered when an enemy target is found, the degree of freedom of the phased array radar is expanded through multi-domain agile technologies such as the airspace, a frequency domain, a waveform domain and a parameter domain, and accordingly, the suppression of the interference of the number of multi-domain channels is achieved.
Referring to fig. 1, in the method for multi-domain agility anti-interference for phased array radar according to the embodiment of the present invention, in the step a, the spatial domain information extracted by the reconnaissance channel includes an angle and a waveform, and the time-frequency domain information includes a time width, a frequency, and a power.
Specifically, through the reconnaissance channel, the interference angle, waveform, time width, frequency, power and other airspace and time-frequency domain information are extracted, the interference analysis of the phase-controlled radar is improved, the anti-interference performance of the radar is further improved, and the radar fighting efficiency is further improved.
In this embodiment, the angle information of the interference is used to determine an area where a beam is not scanned; the waveform information is used for determining the interference pattern so as to pertinently sample the corresponding anti-interference means; the time width information is used to determine whether the interference is a jamming or spoofing interference.
With reference to fig. 1, a phased array radar according to an embodiment of the present inventionIn the step b, the scanning airspace comprises a full airspace or a partial airspace, the scanning area for scanning the partial airspace is determined by a user, and a scanning area [ theta ] is setL,θH]And a scanning interval Δ θ for dividing the wave position of the phase-controlled radar.
Specifically, the complexity of interference analysis is reduced and the anti-interference performance of the radar is further improved by further determining the scanning airspace, so that the fighting efficiency of the radar is further improved.
In this embodiment, a partial airspace scan is adopted, and the scan angle is θL10 degrees, thetaHWhen the angle is 30 degrees and the angle Δ θ is 1 degree, the scanning area of the radar is [10,30 ]]And in total, 21 wave bits need to be scanned in the region.
Referring to fig. 1, in the multi-domain agility anti-jamming method for the phased array radar according to the embodiment of the present invention, in the step c, the full agility scan is a sequential scan or a partial agility scan, where the sequential scan is from θ to θ in an angular sequenceLTo thetaHPerforming continuous scanning, wherein the partial agility scanning refers to performing full agility scanning only in a designated area, other areas are sequential scanning, and the full agility scanning in the airspace is performed in [ theta ]L,θL+Δθ,…,θH-Δθ,θH]And selecting specific wave positions by random numbers within the range of the angle values to perform traversal scanning, wherein each angle is selected only once.
Particularly, by adopting the full agility scanning in the airspace, the scanning mode of acquiring the radar by the scout of the enemy becomes difficult, the deceptive interference cannot be carried out, the suppression interference with a large amount of consumed energy can be carried out, the anti-interference performance of the radar is further improved, and the radar battle efficiency is further improved.
In this embodiment, the range of the angle values is [10,11, …,29,30], there are 21 wave bits in total, and since a sequence is generated by the random number, and then the traversal scanning is performed in this sequence, each wave bit is scanned once.
Referring to fig. 1, in the multi-domain agility anti-interference method for the phased array radar according to the embodiment of the present invention, in the step d, the agility frequency is a fixed frequency or a partial agility frequency, where the fixed frequency refers to that the frequency of each angle of the radar does not change during beam scanning, the partial agility frequency refers to that the agility frequency is performed in a specified area, other areas operate at the fixed frequency, frequency values of the phased radar operating at different wave positions with the agility frequency are randomly changed, and a change range is determined by the radar operating frequency band and the scout channel information.
Particularly, by adopting the full agility scanning and agility frequency conversion working modes, the working frequency information of the radar obtained by the reconnaissance plane is further increased, so that an enemy can only use low-efficiency broadband interference but cannot perform aiming type interference, the anti-interference performance of the radar is further improved, and the radar combat efficiency is further improved.
In this embodiment, 10 operating frequencies of the radar are set as [ f ]1,f2,…,f10]And the interfered frequency point given by the scout channel is f1,f2,f3Then the range of the operating frequency point that can be selected for each wave position is f3,f4,f5,f6,f7,f8,f9,f10In this embodiment, the operating frequency point f is selected from the 10-degree wave position6。
Referring to fig. 1, in the multi-domain agility anti-jamming method for the phased array radar according to the embodiment of the present invention, in the step e, the waveform agility randomly selects one of a fixed pulse signal, a chirp signal, a non-chirp signal, a phase encoded signal, and a mixed encoded signal in a waveform library.
In this embodiment, all pulses of each wave bit need to be subjected to random frequency agility and waveform agility within a certain range. Assuming a 10 degree wave position with 2 pulses, the first pulse in the example selects the operating frequency point f6The waveform is a phase coding signal; the second pulse selects the operating frequency point f9The waveform is a chirp signal.
Referring to fig. 1, in the multi-domain agility anti-interference method for the phased array radar according to the embodiment of the present invention, the waveform agility is a fixed waveform or a part of the waveform agility, where the fixed waveform indicates that the waveform of the phased radar does not change when the phased radar operates, the part of the waveform indicates that the radar performs waveform agility in a specified area when the radar operates, and other areas operate with fixed waveforms.
Particularly, by randomly selecting a fixed pulse signal, a linear frequency modulation signal, a non-linear frequency modulation signal, a phase coding signal and a mixed coding signal in a waveform library, the diversity of the signals is increased, so that an enemy scout cannot determine the working frequency signal of the radar, the anti-interference performance of the radar is further improved, and the combat efficiency of the radar is further improved.
Referring to fig. 1, in the multi-domain agility anti-interference method for the phased array radar according to the embodiment of the present invention, in the step f, the parameters agile to randomly select pulse parameters when determining the pulse frequency and the waveform, where the pulse parameters include a pulse width, a modulation mode, and a repetition period, and a range of the parameter agility is determined by the working parameters of the phased radar and the scout channel information.
Particularly, by adopting waveform agility and parameter agility to further destroy the reconnaissance of enemies, radar signals are effectively hidden, the enemy targets are found, meanwhile, the enemy targets are guaranteed not to be interfered, the anti-interference performance of the radar is further improved, and the radar fighting efficiency is further improved.
In this embodiment, the parameters of each pulse need to be randomly parameter-agile within a certain range. Setting a 10-degree wave position to have 2 pulses, wherein the first pulse in the embodiment selects a pulse width of 64us, a modulation mode is two-phase code phase modulation, and a repetition period is 640 us; the second pulse has a selected pulse width of 32us, a modulation mode of none, and a repetition period of 320 us.
Referring to fig. 1, in the multi-domain agility anti-interference method for the phased array radar according to the embodiment of the present invention, the parameter agility is a fixed parameter or a part of the parameter agility, where the fixed parameter indicates that the parameter of the radar does not change during operation, the part of the parameter indicates a waveform parameter in a designated area of the radar during operation, and the other areas adopt fixed waveform parameters.
Referring to fig. 1, in the method for multi-domain agility anti-jamming of a phased array radar according to the embodiment of the present invention, in the step g, the agility information includes a space domain, a frequency domain, a waveform domain, and a parameter domain.
Specifically, the degree of freedom of the phased array radar is expanded through multi-domain agility technologies such as airspace, frequency domain, waveform domain and parameter domain, so that the suppression of interference which is more than the number of channels can be realized, the anti-interference performance of the radar is further improved, and the fighting efficiency of the radar is further improved.
So far, the technical method of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical method after the changes or substitutions will fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A multi-domain agility anti-interference method for a phased array radar is characterized by comprising the following steps:
step a: extracting interference space domain and time-frequency domain information through a reconnaissance channel of the phase-controlled radar;
step b: determining a scanning airspace through the wave beam of the phase-controlled radar;
step c: performing fully agile scanning on the airspace at different periods through the phase-controlled radar;
step d: scanning a space domain at different wave positions by the phase control radar in a frequency agile mode;
step e: transmitting pulses to an airspace in a frequency agile manner by the phase control radar according to the frequency agile pulse frequency and the waveform agility;
step f: when the transmitting pulse frequency and the waveform are determined, parameter agility is carried out on the phase-controlled radar parameters;
step g: storing the agility information of steps c to f in a memory as a transmit signal and a receive match signal for the phase-controlled radar.
2. The phased array radar multi-domain agility anti-jamming method according to claim 1, wherein in step a, the spatial domain information of the interference extracted by the scout channel comprises angle and waveform, and the time-frequency domain information comprises time width, frequency and power.
3. The phased array radar multi-domain agility anti-jamming method according to claim 1, wherein in the step b, the scanning airspace comprises a full airspace or a partial airspace, a scanning area for scanning the partial airspace is determined by a user, and the scanning area is set to [ θ ],L，θH]and a scanning interval Δ θ for dividing the wave position of the phase-controlled radar.
4. The multi-domain agility interference rejection method for phased array radar according to claim 1, wherein in step c, the fully agility scan is a sequential scan or a partially agility scan, wherein the sequential scan is from θ sequentially in an angular orderLTo thetaHPerforming continuous scanning, wherein the partial agility scanning refers to performing full agility scanning only in a designated area, other areas are sequential scanning, and the full agility scanning in the airspace is performed in [ theta ]L,θL+Δθ,…,θH-Δθ,θH]And selecting specific wave positions by random numbers within the range of the angle values to perform traversal scanning, wherein each angle is selected only once.
5. The multi-domain agility anti-jamming method according to claim 1, wherein in step d, the agility is a fixed frequency or a partial agility, wherein the fixed frequency means that the frequency of each angle does not change when the radar scans the beam, the partial agility means that the agility is performed in a specified area, the other areas are fixed frequencies, the frequency values of the phased radar operating at different wave positions in the agility are randomly changed, and the change range is determined by the radar operating frequency range and the scout channel information.
6. The phased array radar multi-domain agility interference rejection method according to claim 1, wherein in step e, the waveform agility selects one of a fixed pulse signal, a chirp signal, a non-chirp signal, a phase encoded signal, and a hybrid encoded signal randomly in a waveform library.
7. The multi-domain agility anti-interference method according to claim 6, wherein the waveform agility is a fixed waveform or a partial waveform agility, wherein the fixed waveform means that the waveform of the phased radar does not change during operation, the partial waveform means that the radar performs waveform agility in a designated area during operation, and the other range adopts a fixed waveform.
8. The multi-domain agility anti-jamming method according to claim 1, wherein in step f, the parameters agility to randomly select pulse parameters including pulse width, modulation mode and repetition period in determining the pulse frequency and waveform, and the range of parameter agility is determined by the working parameters of the phased radar and the scout channel information.
9. The multi-domain agility anti-jamming method according to claim 8, wherein the parameters agility to fixed parameters or part of the parameters agility, wherein the fixed parameters refer to that the parameters of the radar do not change during operation, the part of the parameters agility refer to that the waveform parameters of the radar do agility during operation in a specified area, and the other areas adopt fixed waveform parameters.
10. The phased array radar multi-domain agility interference rejection method according to claim 1, wherein in step g, the agility time information comprises spatial domain, frequency domain, waveform domain, and parameter domain.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114019462A (en) * | 2022-01-06 | 2022-02-08 | 中国人民解放军空军预警学院 | Method for improving low interception performance and anti-interference performance of radar |
| CN114137482A (en) * | 2021-10-27 | 2022-03-04 | 安徽隼波科技有限公司 | Method and system for solving same frequency interference of frequency-sweeping radar |
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