CN113009427B - Phased array radar multi-domain agile anti-interference method - Google Patents
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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 a multi-domain agile anti-interference method of a phased array radar. The invention relates to the technical field of radars, in particular to a multi-domain agile anti-interference method of a phased array radar, which comprises the steps of firstly utilizing a reconnaissance channel of the radar to obtain related information of interference, then carrying out agile scanning according to a beam scanning area, adopting agile frequency mode when the radar scans, then working by adopting agile frequency mode and agile waveform mode on each wave position, and finally storing real waveforms and parameters which are used as transmitting signals and receiving matching signals of the radar, wherein parameters of the working parameters can also be agile; the anti-interference method adopts the multi-domain agile modes such as airspace, frequency domain, waveform domain, parameter domain and the like to carry out anti-interference, has the capability of simultaneously inhibiting composite interference such as deception and suppression, overcomes the defect that the radar working mode and signal are easy to detect interference, and has the advantages of multiple-mode composite interference resistance and a large number of interference. 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 agile anti-interference method of a phased array radar.
Background
Phased array radar is an important direction of modern radar development, and is widely applied to both military and civil fields. Compared with the mechanically scanned radar, the phased array radar has the advantages of flexible pointing, reconfigurability and the like, and is easy to realize multi-beam and multifunctional, so that the phased array radar has wide application prospect.
However, with the rapid development of modern electronic technology, interference technology for phased array radar is also in continuous development of flying speed. With some challenge cases in recent years, it can be seen that some of the disadvantages of phased array radars also begin to be exposed. The multichannel characteristic of the phased radar ensures that the phased radar has good sidelobe interference resistance, but main lobe interference easily causes main lobe distortion, so that interference suppression cannot be realized. However, in modern war, shielding type interference, accompanying type interference and self-defense type interference are greatly generated, and meanwhile, interference opportunities cooperate with interference patterns such as noise suppression, spoofing, forwarding type slicing and the like to jointly interfere with the radar, so that the operational efficiency of the phased array radar is greatly reduced or is invalid. From the above analysis, it is clear that the interference is various and the combination method is various, and it is not feasible to perform the interference prevention by the interference recognition method. In addition, in the practical application process, the battlefield situation is complex and changeable, and a large amount of data analysis cannot be performed, so that an effective means for dealing with the current interference is found out.
Disclosure of Invention
Therefore, the invention provides a multi-domain agile anti-interference method for the phased array radar. The radar frequency domain, the radar waveform domain, the radar parameter domain and other usable means are subjected to multi-domain agility, and the detection of the enemy is destroyed, so that the enemy cannot predict the working mode, the frequency and the parameters of the radar at the next moment, and the aim of effectively inhibiting multi-mode composite interference is fulfilled. Comprising the following steps: obtaining relevant interference information by utilizing a reconnaissance channel of the radar; then, according to the selection of the beam scanning area, carrying out full agile scanning; a frequency agility mode is adopted during radar scanning; each wave position works by adopting frequency agility and wave agility; the parameters are also agile in the selection of the working parameters; finally, the real waveform and parameters are stored and used as the transmitting signal and the receiving matching signal of the radar. The phased array radar is in the agile process in the airspace, the frequency domain, the waveform domain, the parameter domain and the like, so that the reconnaissance of enemy is destroyed, the radar has the capability of simultaneously inhibiting composite interference such as deception, suppression and main and auxiliary lobes, and has the advantages of multiple-mode composite interference resistance and a large number of interference. The method is used for solving the problems that the phased array radar operation efficiency is greatly reduced or the phased array radar operation efficiency is invalid because a large amount of data analysis cannot be performed due to various interference types, various combination patterns and complex and changeable battlefield situations 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 space domain and time-frequency domain information of the interference through a phase control radar reconnaissance channel;
step b: determining a scanning airspace through the wave beam of the phased radar;
step c: carrying out full agile scanning on the airspace in different periods through the phased radar;
step d: scanning the space domain by the phased radar at different wave positions with the working frequency of agile frequency;
step e: transmitting pulses by the phased radar at a agile pulse frequency and by adopting a waveform agile airspace to the waveform;
step f: when the transmitted pulse frequency and the waveform are determined, the phased radar performs parameter agility;
step g: storing the agile information of steps c to f in a memory for use as a transmit signal and a receive match signal for the phased radar.
Further, the method comprises the steps of: in the step a, the spatial domain information of the interference extracted by the reconnaissance channel comprises angles and waveforms, and the time-frequency domain information comprises time width, frequency and power;
further, in the step b, the scanning airspace includes a full airspace or a partial airspace, a scanning area for scanning the partial airspace is determined by a user, and a scanning area [ θ ] is set L ,θ H ]And a scanning interval delta theta for dividing the wave position of the phased radar.
Further, in the step c, the full agile scan is a sequential scan or a partial agile scan, where the sequential scanThe description is from theta in angular order L To theta H Continuous scanning, wherein the partial agile scanning means that full agile scanning is performed only in a designated area, other areas are sequentially scanned, and the airspace is subjected to full agile scanning to be in [ theta ] L ,θ L +Δθ,…,θ H -Δθ,θ H ]And selecting specific wave bits from random numbers in the range of angle values for traversing scanning, wherein each angle is selected only once.
Further, in the step d, the agile frequency is fixed frequency or partial agile frequency, wherein the fixed frequency means that the frequency of each angle of the radar does not change when the beam scans, the partial agile frequency means that the agile frequency is performed in a designated area, other areas work at the fixed frequency, the frequency value of the phased radar when the agile frequency works at different wave positions is randomly changed, and the change range is jointly determined by the radar working frequency range and the scout channel information.
Further, in the step e, the waveform agility is changed to randomly select one of a fixed pulse signal, a chirp signal, a non-chirp signal, a phase encoded signal, and a hybrid encoded signal in a waveform library.
Further, the waveform agility is changed into a fixed waveform or a partial waveform agility, wherein the fixed waveform refers to that the waveform of the phased radar is not changed when the phased radar works, the partial waveform refers to that the radar performs waveform agility in a designated area when the phased radar works, and other ranges work by adopting the fixed waveform.
Further, in the step f, the parameter agility is changed into a pulse parameter randomly selected when the pulse frequency and the waveform are determined, the pulse parameter comprises a pulse width, a modulation mode and a repetition period, and the parameter agility range is determined by the working parameter of the phased radar and the scout channel information.
Further, the parameter agility is changed into a fixed parameter or a part of parameter agility, wherein the fixed parameter refers to the parameter of the radar when in operation, the part of parameter refers to the waveform parameter of the radar in an appointed area when in operation, and other areas adopt the fixed waveform parameter.
Further, in the step g, the agile information includes spatial domain, frequency domain, waveform domain, and parameter domain.
Compared with the prior art, the method has the beneficial effects that the scanning mode of the radar is difficult to obtain by the scout of the enemy through carrying out full agile scanning on the airspace, deception interference cannot be carried out, and only a large amount of energy consumption can be used for suppressing interference, further, the working frequency information of the radar is obtained by the scout through the full agile scanning and agile frequency conversion working mode, so that the enemy can only use low-efficiency broadband interference and can not carry out aiming interference, further, the scout of the enemy is damaged through waveform agile and parameter agile, thereby effectively hiding radar signals, ensuring that the radar of the enemy is not interfered while finding the target of the enemy, expanding the freedom of the phased array radar through the multi-domain agile technologies such as airspace, frequency domain, waveform domain, parameter domain and the like, and further realizing the suppression of the multi-domain channel quantity interference.
Further, the scout channel is used for extracting spatial domain and time-frequency domain information such as interference angle, waveform, time width, frequency and power, so that analysis of interference by the phased radar is improved, anti-interference performance of the radar is further improved, and therefore radar combat efficiency is further improved.
Further, by further determining the scanning airspace, the complexity of interference analysis is reduced, and the anti-interference performance of the radar is further improved, so that the radar fight efficiency is further improved.
Furthermore, by adopting the full agile scanning of the airspace, the scanning mode of the radar is difficult to obtain by the enemy scout, deception interference cannot be carried out, and only suppression interference with a large amount of energy consumption can be carried out, so that the anti-interference performance of the radar is further improved, and the radar fight efficiency is further improved.
Furthermore, by adopting the full agile scanning and agile frequency working mode, the working frequency information of the radar acquired by the scout aircraft is further increased, so that enemies can only use low-efficiency broadband interference and can not conduct aiming interference, the anti-interference performance of the radar is further improved, and the radar combat efficiency is further improved.
Further, by randomly selecting the fixed pulse signal, the linear frequency modulation signal, the nonlinear frequency modulation signal, the phase coding signal and the mixed coding signal in the waveform library, the diversity of the signals is increased, so that the enemy scout can not determine the working frequency signal of the radar, the anti-interference performance of the radar is further improved, and the radar fight efficiency is further improved.
Further, by adopting the reconnaissance of further damaging enemy with waveform agility and parameter agility, radar signals are effectively hidden, the enemy target is found out, the enemy target is not interfered, the anti-interference performance of the radar is further improved, and therefore the radar fight 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 suppression of interference more than the number of channels can be realized, the anti-interference performance of the radar is further improved, and the radar fight efficiency is further improved.
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FIG. 1 is a flow chart of a method for resisting disturbance of a phased array radar multi-domain agile system according to the present invention;
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of 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 merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Fig. 1 is a flowchart of a multi-domain agile anti-interference method for a phased array radar according to the present invention. The multi-domain agile anti-interference method for the phased array radar provided by the embodiment of the invention comprises the following steps:
step a: extracting the space domain and time-frequency domain information of the interference through a phase control radar reconnaissance channel;
step b: determining a scanning airspace through the wave beam of the phased radar;
step c: carrying out full agile scanning on the airspace in different periods through the phased radar;
step d: scanning the space domain by the phased radar at different wave positions with the working frequency of agile frequency;
step e: transmitting pulses by the phased radar at a agile pulse frequency and by adopting a waveform agile airspace to the waveform;
step f: when the transmitted pulse frequency and the waveform are determined, the phased radar performs parameter agility;
step g: storing the agile information of steps c to f in a memory for use as a transmit signal and a receive match signal for the phased radar.
Specifically, through carrying out the swift change scanning to the airspace to make the scout plane of enemy acquire the scanning mode of radar become difficult, unable to carry out deception jamming, only can carry out the suppression interference of a large amount of consumed energy, further through the swift change scanning of all and swift frequency conversion work mode, the operating frequency information that has increased the scout plane and obtained the radar, so that the enemy can only use low-efficiency broadband interference, and can't carry out aiming type interference, further through the reconnaissance of waveform agility and parameter agility destruction enemy, thereby effectively hiding the radar signal, guarantee that self radar is not disturbed when finding enemy target, the degree of freedom of phased array radar has been extended through the multi-domain agility technologies such as airspace, frequency domain, waveform domain, parameter domain, etc. thereby realize the suppression of multi-domain channel quantity interference.
With continued reference to fig. 1, in the method for multi-domain agile anti-interference of a phased array radar according to the embodiment of the present invention, in the step a, the spatial domain information of the interference extracted by the scout channel includes an angle and a waveform, and the time-frequency domain information includes a time-width, a frequency and a power.
Specifically, the scout channel is used for extracting spatial domain and time-frequency domain information such as interference angle, waveform, time width, frequency and power, so that analysis of interference by the phased radar is improved, the anti-interference performance of the radar is further improved, and the radar combat efficiency is further improved.
In this embodiment, the interference angle information is used to determine an area where the 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 disturbance is a jammer or a spoofed disturbance.
With continued reference to fig. 1, in the method for phased array radar multi-domain agile interference cancellation according to the embodiment of the present invention, in the step b, the scanning airspace includes a full airspace or a partial airspace, a scanning area for scanning the partial airspace is determined by a user, and a scanning area [ θ ] is set L ,θ H ]And a scanning interval delta theta for dividing the wave position of the phased radar.
Specifically, by further determining the scanning airspace, the complexity of interference analysis is reduced, and the anti-interference performance of the radar is further improved, so that the radar combat efficiency is further improved.
In this embodiment, a partial airspace scan is used, and the scan angle is θ L =10 degrees, θ H When 30 degrees and Δθ=1 degree, the scanning area of the radar is [10,30]The total number of the scanning wave positions in the region is 21.
With continued reference to fig. 1, in the method for multi-domain agile interference rejection of phased array radar according to the embodiment of the present invention, in the step c, the full agile scanning is a sequential scanning or a partial agile scanning, where the sequential scanning refers to a scanning from θ in an angular order L To theta H Continuous scanning, wherein the partial agile scanning means that full agile scanning is performed only in a designated area, other areas are sequentially scanned, and the airspace is subjected to full agile scanning to be in [ theta ] L ,θ L +Δθ,…,θ H -Δθ,θ H ]And selecting specific wave bits from random numbers in the range of angle values for traversing scanning, wherein each angle is selected only once.
Specifically, by adopting the full agile scanning of the airspace, the scanning mode of the radar is difficult to obtain by the enemy scout, deception interference cannot be carried out, and only suppression interference with a large amount of energy consumption can be carried out, so that the anti-interference performance of the radar is further improved, and the radar fight efficiency is further improved.
In this embodiment, the range of angle values is [10,11, …,29,30], and a total of 21 wave bits, since the random numbers are generated in a sequence, and then the traversing scanning is performed in the sequence, each wave bit is scanned only once.
With continued reference to fig. 1, in the method for multi-domain agile anti-interference of phased array radar according to the embodiment of the present invention, in the step d, the agile frequency is fixed frequency or partial agile frequency, where the fixed frequency refers to no change in frequency of each angle of the radar during beam scanning, the partial agile frequency refers to agile frequency in a designated area, other areas are fixed frequency, frequency values of the phased array radar during agile frequency operation are randomly changed, and a change range is determined by radar operating frequency band and scout channel information together.
Specifically, by adopting the full agile scanning and agile frequency working mode, the working frequency information of the radar obtained by the scout aircraft is further increased, so that enemies can only use low-efficiency broadband interference and can not conduct aiming interference, the anti-interference performance of the radar is further improved, and the radar combat efficiency is further improved.
In the present embodiment, the number of operating frequencies of the radar is 10, and is [ f 1 ,f 2 ,…,f 10 ]And the interfered frequency point given by the reconnaissance channel is f 1 ,f 2 ,f 3 Each wave energy can select the working frequency point range f 3 ,f 4 ,f 5 ,f 6 ,f 7 ,f 8 ,f 9 ,f 10 The 10 degree wave position in this embodiment selects the operating frequency point f 6 。
With continued reference to fig. 1, in the method for multi-domain agile interference rejection of a phased array radar according to the embodiment of the present invention, in the step e, the waveform agile is one of a fixed pulse signal, a chirp signal, a non-chirp signal, a phase encoded signal, and a hybrid encoded signal selected randomly from a waveform library.
In this embodiment, all pulses of each wave position need to be subjected to random agility and waveform agility within a determined range. Assuming a 10 degree wave position with 2 pulses, the first pulse in the embodiment selects the operating frequency point f 6 The waveform is a phase coded signal; the second pulse selects the working frequency point f 9 The waveform is a chirp signal.
With continued reference to fig. 1, in the multi-domain agile anti-interference method for a phased array radar according to the embodiment of the present invention, the waveform agile is changed into a fixed waveform or a partial waveform agile, where the fixed waveform refers to that the phased array radar does not change in waveform during operation, the partial waveform refers to that the radar performs waveform agile in a designated area during operation, and other ranges work with the fixed waveform.
Specifically, by randomly selecting the fixed pulse signal, the linear frequency modulation signal, the nonlinear frequency modulation signal, the phase coding signal and the mixed coding signal in the waveform library, the diversity of the signals is increased, so that the enemy scout can not determine the working frequency signal of the radar, the anti-interference performance of the radar is further improved, and the radar fight efficiency is further improved.
With continued reference to fig. 1, in the method for multi-domain agile anti-interference of a phased array radar according to the embodiment of the present invention, in the step f, the parameter agile is randomly selected when the pulse frequency and the waveform are determined, where the pulse parameter includes a pulse width, a modulation mode and a repetition period, and a range of the parameter agile is determined by the working parameter of the phased array radar and the scout channel information together.
Specifically, the reconnaissance of further destroying the enemy by adopting waveform agility and parameter agility is adopted, so that radar signals are effectively hidden, the enemy target is found out, the enemy target is not interfered, the anti-interference performance of the radar is further improved, and the radar fight efficiency is further improved.
In this embodiment, the parameters of each pulse need to be randomly changed within a certain range. Setting a 10-degree wave bit to have 2 pulses, wherein the first pulse in the embodiment selects a pulse width of 64us, the modulation mode is two-phase code phase modulation, and the repetition period is 640us; the second pulse has a selected pulse width of 32us, no modulation mode and a repetition period of 320us.
With continued reference to fig. 1, in the multi-domain agile anti-interference method for a phased array radar according to the embodiment of the present invention, the parameter agile is changed into a fixed parameter or a part of parameters agile, where the fixed parameter refers to a parameter of the radar when working, the part of parameters refers to a waveform parameter of the radar in a designated area when working, and other areas adopt fixed waveform parameters.
Referring to fig. 1, in the method for anti-interference of multiple agile phased array radar according to the embodiment of the present invention, in the step g, the agile information includes spatial domain, frequency domain, waveform domain and parameter domain.
Specifically, the degree of freedom of the phased array radar is expanded through multi-domain agile technologies such as airspace, frequency domain, waveform domain and parameter domain, so that suppression of interference more than the number of channels can be realized, the anti-interference performance of the radar is further improved, and the radar fight efficiency is further improved.
Thus far, the technical method of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and the technical methods after such modifications and substitutions will fall within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A phased array radar multi-domain agile anti-interference method, comprising:
step a: extracting the space domain and time-frequency domain information of interference through a reconnaissance channel of the phased radar;
step b: determining a scanning airspace through the wave beam of the phased radar;
step c: carrying out full agile scanning on the airspace in different periods through the phased radar;
step d: scanning the space domain by the phased radar in a frequency agile manner at different wave positions;
step e: transmitting pulses by the phased radar at a agile pulse frequency and by adopting a waveform agile airspace to the waveform;
step f: when the transmitting pulse frequency and the waveform are determined, the parameters of the phased radar are agile;
step g: storing the agile information of the steps c to f in a memory to serve as a transmitting signal and a receiving matching signal of the phased radar;
in the step a, the spatial domain information of the interference extracted by the reconnaissance channel comprises angles and waveforms, and the time-frequency domain information comprises time width, frequency and power;
in the step b, the scanning airspace includes 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 [ theta ] L ,θ H ]And the scanning interval is delta theta, which is used for dividing the wave position of the phase control radar;
in the step c, the full agile scan is a sequential scan or a partial agile scan, wherein the sequential scan refers to a scan from θ in angular order L To theta H Continuous scanning, wherein the partial agile scanning means that full agile scanning is performed only in a designated area, other areas are sequentially scanned, and the airspace is subjected to full agile scanning to be in [ theta ] L ,θ L +Δθ,…,θ H -Δθ,θ H ]Selecting specific wave bits from random numbers in the range of angle values to carry out traversal scanning, wherein each angle is selected only once;
in the step d, the agile frequency is fixed frequency or partial agile frequency, wherein the fixed frequency means that the frequency of each angle of the radar is not changed when the wave beam scans, the partial agile frequency means that agile frequency is carried out in a designated area, other areas are fixed frequency, the frequency value of the phased radar is randomly changed when the agile frequency works in different wave positions, and the change range is determined by the radar working frequency range and the scout channel information together;
in the step e, the waveform agility is changed into one of a fixed pulse signal, a linear frequency modulation signal, a nonlinear frequency modulation signal, a phase coding signal and a mixed coding signal randomly selected from a waveform library;
the waveform agility is changed into a fixed waveform or a part of waveform agility, wherein the fixed waveform refers to that the waveform of the phased radar is not changed when the phased radar works, the part of waveform refers to that the radar performs waveform agility in a designated area when the phased radar works, and other ranges adopt the fixed waveform;
in the step f, the parameter agility is changed into a pulse parameter which is randomly selected when the pulse frequency and the waveform are determined, wherein the pulse parameter comprises pulse width, a modulation mode and a repetition period, and the parameter agility range is determined by the working parameter of the phased radar and the reconnaissance channel information;
the parameter agility is changed into a fixed parameter or a part of parameter agility, wherein the fixed parameter refers to the fact that the parameter of the radar is not changed when the radar works, the part of parameter agility refers to the waveform parameter agility when the radar works in a designated area, and other areas adopt fixed waveform parameters;
in the step g, the agile information includes spatial domain, frequency domain, waveform domain and parameter domain.
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