An anti-interference method based on shield pulse

Abstract

The present invention discloses an anti-interference method based on a cover pulse, which belongs to the field of radar anti-interference technology. The specific method comprises: step 1: defining an anti-interference area, establishing a jammer channel model, analyzing the anti-interference area through the jammer channel model, and obtaining a jammer channel number interval [T i , T a ] and the effective bandwidth interval of the corresponding channel [D i , D a ]; Step 2: Establish the shield pulse signal parameter model, formulate parameter limiting conditions, and set the parameter limiting conditions and the jammer channel number interval [T i , T a ] and the effective bandwidth interval of the corresponding channel [D i , D a ] The integration mark is used as the shield parameter input data, and the shield parameter input data is input into the shield pulse signal parameter model to obtain the shield pulse signal parameter data; the anti-interference problem is solved by the "shield pulse signal + effective pulse signal" method.

Description

Technical Field

[0001] The invention belongs to the technical field of radar anti-interference, and in particular is an anti-interference method based on a cover pulse. Background Art

[0002] Active deceptive jamming based on channelized receivers and DRFM frequency storage transponders can effectively shield or deceive detection echo signals in a short time with less power resources by accurately targeting tracking radar in frequency, time and even space. Since the jammer transmits signals directly into the main lobe of the antenna, traditional anti-jamming technology aimed at suppressing interference and enhancing echoes is difficult to work. Therefore, it is urgent to propose an anti-jamming method based on cover pulses, which can solve the anti-jamming problem by means of "cover pulse signal + effective pulse signal". Summary of the invention

[0003] In order to solve the problems existing in the above scheme, the present invention provides an anti-interference method based on shielding pulse.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] An anti-interference method based on a shield pulse, the specific method comprising:

[0006] Step 1: Define the anti-interference area, establish the jammer channel model, analyze the anti-interference area through the jammer channel model, and obtain the jammer channel number interval [T i , T a ] and the effective bandwidth interval of the corresponding channel [D i , D a ];

[0007] Step 2: Establish the shield pulse signal parameter model, formulate parameter limiting conditions, and set the parameter limiting conditions and the jammer channel number interval [T i , T a ] and the effective bandwidth interval of the corresponding channel [D i , D a ] integrating the mark as the shield parameter input data, inputting the shield parameter input data into the shield pulse signal parameter model, and obtaining the shield pulse signal parameter data;

[0008] Step 3: Obtain the historical transmission plan of the cover pulse signal, establish a plan library, and store the obtained historical transmission plan of the cover pulse signal in the plan library;

[0009] Step 4: Construct a cosine similarity function. Use the cosine similarity function to match the shield pulse signal parameter data with the shield pulse signal historical transmission scheme in the scheme library to obtain the corresponding interest function value w ij ;

[0010] Step 5: Use the interest function value w ij Screen out the reference plan and prepare the transmission plan of the cover pulse signal and the effective pulse signal based on the reference plan.

[0011] Furthermore, the method for establishing a jammer channel model includes:

[0012] Obtain the jammer models that have appeared in the anti-interference area in the past, collect the corresponding jammer channel numbers and effective bandwidths according to the jammer models, count the historical jammer channel number intervals and historical effective bandwidth intervals, and calculate the proportion of each jammer channel number in the corresponding historical jammer channel number interval and the proportion of each effective bandwidth in the corresponding historical effective bandwidth interval;

[0013] Establish a detection model, integrate and mark the historical jammer channel number interval, the historical effective bandwidth interval, and the proportion of each jammer channel number in the corresponding historical jammer channel number interval and the proportion of each effective bandwidth in the historical effective bandwidth interval as detection input data, input the detection input data into the detection model, obtain the corresponding detection pulse signal, transmit the detection pulse signal, obtain the interference data of the detection pulse signal, establish an analysis model, analyze the interference data of the detection pulse signal through the analysis model, and determine whether the corresponding jammer channel number and effective bandwidth interval are interval boundary values;

[0014] When the corresponding jammer channel number and effective bandwidth interval are not interval boundary values, a new detection pulse signal is resent until all boundary values ​​of the jammer channel number interval and the effective bandwidth interval are obtained.

[0015] Furthermore, the guard pulse signal parameter data includes a frequency interval between the guard pulse signal and the effective pulse signal, an available frequency point number interval, and a relative amplitude interval between the guard pulse signal and the effective pulse signal.

[0016] Furthermore, the method for formulating the parameter limiting condition includes:

[0017] The frequency interval between the guard pulse signal and the effective pulse signal is marked as Δf o , the available frequency points of the cover pulse signal are marked as T y , the formula D>T y , as the first-level limiting condition, the second-level limiting condition is formulated according to the transmission conditions of the actual cover pulse signal and the effective pulse signal, and the first-level limiting condition and the second-level limiting condition are integrated and marked as parameter limiting conditions.

[0018] Furthermore, the cosine similarity function is

[0019] Furthermore, i and j are respectively similarity vectors between the cover pulse signal parameter data i and the corresponding data j in the cover pulse signal historical transmission scheme; the similarity vector includes: index one, index two and index three.

[0020] Further, obtain the interest function value w ij The methods include:

[0021] Create a similarity vector triple (x1, x2, x3), and determine the interest function based on indicators one, two, and three:

[0022]

[0023] Furthermore, α1, α2, and α3 are adjustment coefficients, and the value range of α1, α2, and α3 is [0, 1].

[0024] Furthermore, through the interest function value w ij Methods for screening reference solutions include:

[0025] Set the similarity standard value X1, according to the formula Q = |w ij -X1|Get the deviation value Q, and select the interest function value w corresponding to the smallest deviation value Q ij , get the corresponding reference plan.

[0026] Compared with the prior art, the beneficial effects of the present invention are: solving the anti-interference problem through the "cover pulse signal + effective pulse signal" method; obtaining the cover pulse signal parameter data in the anti-interference area through steps one and two, providing range support for subsequent scheme design, narrowing the parameter consideration range, and reducing the workload. At the same time, because the parameters are obtained by predicting the performance of the jammer, the anti-interference efficiency is more efficient; by compiling the transmission plan of the cover pulse signal and the effective pulse signal according to the reference plan, it is more practical and successful. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, an anti-interference method based on a shield pulse, the specific method includes:

[0031] Step 1: Define the anti-interference area. The anti-interference area is divided according to the transmitting area and the receiving area. Establish a jammer channel model. Use the jammer channel model to analyze the anti-interference area and obtain the jammer channel number interval [T i , T a ] and the effective bandwidth interval of the corresponding channel [D i , D a ];

[0032] Methods for establishing a jammer channel model include:

[0033] Obtain the jammer models that have appeared in the anti-interference area in the past, collect the corresponding jammer channel numbers and effective bandwidths according to the jammer models, count the historical jammer channel number intervals and historical effective bandwidth intervals, and calculate the proportion of each jammer channel number in the corresponding historical jammer channel number interval and the proportion of each effective bandwidth in the corresponding historical effective bandwidth interval;

[0034] Establish a detection model, integrate and mark the historical jammer channel number interval, the historical effective bandwidth interval, and the proportion of each jammer channel number in the corresponding historical jammer channel number interval and the proportion of each effective bandwidth in the historical effective bandwidth interval as detection input data, input the detection input data into the detection model, obtain the corresponding detection pulse signal, transmit the detection pulse signal, obtain the interference data of the detection pulse signal, establish an analysis model, the analysis model is a neural network model, and is established by training the interference data of the detection pulse signal and the corresponding analysis results as a training set, analyze the interference data of the detection pulse signal through the analysis model, and judge whether the corresponding jammer channel number and effective bandwidth interval are interval boundary values;

[0035] When the corresponding jammer channel number and effective bandwidth interval are not interval boundary values, a new detection pulse signal is resent until all boundary values ​​of the jammer channel number interval and the effective bandwidth interval are obtained;

[0036] The method for establishing a detection model includes: obtaining historical detection input data, setting a corresponding detection pulse signal for the detection input data, the detection pulse signal is mainly set according to the numerical interval in the historical detection input data and the numerical proportion in the corresponding interval, and is used to detect the boundary value of the numerical interval, that is, according to the proportion of the numerical values ​​at both ends of the numerical interval, send a suitable detection pulse signal to test the interference degree of the jammer on the detection pulse signal; construct an artificial intelligence model, which is a neural network model, divides the historical detection input data and the corresponding detection pulse signal into a training set, a test set and a verification set, and trains, tests and verifies the artificial intelligence model through the training set, the test set and the verification set; and marks the trained artificial intelligence model as a detection model;

[0037] Step 2: Establish the shield pulse signal parameter model, formulate parameter limiting conditions, and set the parameter limiting conditions and the jammer channel number interval [T i , T a ] and the effective bandwidth interval of the corresponding channel [D i , D a ] integrating the mark as the shield parameter input data, inputting the shield parameter input data into the shield pulse signal parameter model, and obtaining the shield pulse signal parameter data;

[0038] The shield pulse signal parameter data includes the frequency interval between the shield pulse signal and the effective pulse signal, the available frequency point number interval, and the relative amplitude interval between the shield pulse signal and the effective pulse signal;

[0039] Methods for establishing parameter limits include:

[0040] The frequency interval between the guard pulse signal and the effective pulse signal is marked as Δf o The available frequency points of the cover pulse signal are marked as T y , the formula D>T y , T is the jammer channel number interval [T i , T a ], D is the effective bandwidth interval [D i , D a]; as the first-level limiting condition, the second-level limiting condition is formulated according to the actual transmission conditions of the cover pulse signal and the effective pulse signal, and the first-level limiting condition and the second-level limiting condition are integrated and marked as parameter limiting conditions. The second-level limiting condition is mainly formulated by the expert group according to the transmission conditions and the design requirements of the cover pulse signal. The action mechanism of the cover pulse signal is completely aimed at the channelized receiver and frequency memory and processing system of the jammer. The purpose is to guide the jammer's jammer detection system so that the jammer's signal rate and waveform lock the cover signal, thereby protecting the tracking signal from interference; the cover pulse signal requires three conditions to achieve effective anti-interference: the cover pulse signal is much stronger than the effective pulse signal in the time domain and frequency domain characteristics, so that the channelized receiver of the jammer intercepts the cover pulse signal first; in the jammer frequency memory and processing system, the cover pulse signal must have a higher amplitude threat than the effective pulse signal in the time domain and frequency domain, so that it can be locked first, and the cover pulse signal and the effective pulse signal have sufficient spacing in the frequency domain or time domain.

[0041] The method for establishing a shield pulse signal parameter model includes: obtaining historical shield parameter input data, setting shield pulse signal parameter data according to the historical shield parameter input data, training a neural network model using the historical shield parameter input data and the shield pulse signal parameter data as training sets, and marking the trained neural network model as a shield pulse signal parameter model.

[0042] Step 3: Obtain the historical transmission scheme of the cover pulse signal. The historical transmission scheme of the cover pulse signal is to successfully achieve the anti-interference of the effective pulse signal by setting the cover pulse signal scheme. Because the settings of the cover pulse signal are various, the anti-interference effects produced by different combination schemes are different. Therefore, it is necessary to provide a reference for the current cover scheme through appropriate historical successful cases, establish a scheme library, and store the obtained historical transmission scheme of the cover pulse signal in the scheme library;

[0043] Step 4: Construct a cosine similarity function. Use the cosine similarity function to match the shield pulse signal parameter data with the shield pulse signal historical transmission scheme in the scheme library to obtain the corresponding interest function value w ij ;

[0044] The frequency interval Δf between the guard pulse signal and the effective pulse signal in the guard pulse signal parameter data is o 、Number of available frequencies T y , the relative amplitude A of the shield pulse signal and the effective pulse signal are marked as acquisition index 1, acquisition index 2 and acquisition index 3 respectively, where Δf o 、T yand A are both values ​​within the corresponding intervals. According to the acquisition index 1, the acquisition index 2 and the acquisition index 3, the corresponding evaluation index 1, the evaluation index 2 and the evaluation index 3 are obtained in the historical transmission plan of the cover pulse signal, which are data with the same meaning as the acquisition index 1, the acquisition index 2 and the acquisition index 3. A scoring model is established. The scoring model is a neural network model. By comparing the acquisition index with the evaluation index, the score of the acquisition index relative to the evaluation index is set. Then, the acquisition index, the evaluation index and the corresponding score are used as a training set for training. The trained neural network model is marked as a scoring model. The scores of the three acquisition indicators relative to the three evaluation indicators are obtained through the scoring model.

[0045] The cosine similarity function is Among them, i and j are the similarity vectors of the cover pulse signal parameter data i and the corresponding data j in the historical transmission scheme of the cover pulse signal respectively; the smaller the angle between i and j, the higher the similarity; the similarity vector includes: index one, index two and index three; index one is the general term for the evaluation index and the collection index, and the same is true for index two and index three. A similarity vector triple (x1, x2, x3) is established, and the interest function is determined according to index one, index two and index three:

[0046]

[0047] Among them, α1, α2, and α3 are adjustment coefficients, and the value range of α1, α2, and α3 is [0, 1];

[0048] f ij represents the score of collection index 1 relative to evaluation index 1, f min is the score of the smallest acquisition index 1 relative to the evaluation index 1 recorded in the database, f max is the score of the largest collection index 1 relative to the evaluation index 1 recorded in the database; ij is the score of the collection index 2 relative to the evaluation index 2, t max is the score of the largest acquisition index 2 relative to the evaluation index 2 recorded in the database, t min is the score of the smallest acquisition index 2 relative to the evaluation index 2 recorded in the database; r ij The score of collection index 3 relative to evaluation index 3; r max is the score of the largest acquisition index 3 relative to the evaluation index 3 recorded in the database; r min The score of the smallest acquisition index 3 relative to the evaluation index 3 recorded in the database;

[0049] Step 5: Use the interest function value w ijScreen out the reference scheme, and compile the transmission scheme of the shield pulse signal and the effective pulse signal according to the reference scheme; that is, compile the scheme according to the reference scheme and the shield pulse signal parameter data; it is equivalent to adjusting the reference scheme according to the shield pulse signal parameter data;

[0050] Through the interest function value w ij Methods for screening reference solutions include:

[0051] Set the similarity standard value X1. The similarity standard value X1 is discussed and set by the expert group based on the actual needs of program preparation and anti-interference requirements. According to the formula Q = |w ij -X1|Get the deviation value Q, and select the interest function value w corresponding to the smallest deviation value Q ij , and obtain the corresponding reference solution.

[0052] The above formulas are all calculated by removing dimensions and taking numerical values. The formula is a formula that is closest to the actual situation obtained by collecting a large amount of data and performing software simulation. The preset parameters and preset thresholds in the formula are set by technical personnel in this field according to actual conditions or obtained by simulating a large amount of data.

[0053] In the embodiments provided by the present invention, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division, and there may be other division methods in actual implementation; the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the method of this embodiment.

[0054] It is also obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention.

[0055] Therefore, no matter from which point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is limited by the appended claims rather than the above description, so it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any attached figure mark in the claims should not be regarded as limiting the claims involved.

[0056] In addition, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the system claim can also be implemented by one unit or device through software or hardware. The second and other words are used to indicate names, but not to indicate any particular order.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical method of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. An anti-interference method based on a shield pulse, characterized in that: Specific methods include: Step 1: Define the anti-interference area, establish the jammer channel model, analyze the anti-interference area through the jammer channel model, and obtain the jammer channel number interval [T i , T a ] and the effective bandwidth interval of the corresponding channel [D i , D a ]; Step 2: Establish the shield pulse signal parameter model, formulate parameter limiting conditions, and set the parameter limiting conditions and the jammer channel number interval [T i , T a ] and the effective bandwidth interval of the corresponding channel [D i , D a ] integrating the mark as the shield parameter input data, inputting the shield parameter input data into the shield pulse signal parameter model, and obtaining the shield pulse signal parameter data; Step 3: Obtain the historical transmission plan of the cover pulse signal, establish a plan library, and store the obtained historical transmission plan of the cover pulse signal in the plan library; Step 4: Construct a cosine similarity function. Use the cosine similarity function to match the shield pulse signal parameter data with the shield pulse signal historical transmission scheme in the scheme library to obtain the corresponding interest function value w ij ; Step 5: Use the interest function value w ij Screen out the reference plan and prepare the transmission plan of the cover pulse signal and the effective pulse signal based on the reference plan.

2. The anti-interference method based on the shield pulse according to claim 1 is characterized in that: Methods for establishing a jammer channel model include: Obtain the jammer models that have appeared in the anti-interference area in the past, collect the corresponding jammer channel numbers and effective bandwidths according to the jammer models, count the historical jammer channel number intervals and historical effective bandwidth intervals, and calculate the proportion of each jammer channel number in the corresponding historical jammer channel number interval and the proportion of each effective bandwidth in the corresponding historical effective bandwidth interval; Establish a detection model, integrate and mark the historical jammer channel number interval, the historical effective bandwidth interval, and the proportion of each jammer channel number in the corresponding historical jammer channel number interval and the proportion of each effective bandwidth in the historical effective bandwidth interval as detection input data, input the detection input data into the detection model, obtain the corresponding detection pulse signal, transmit the detection pulse signal, obtain the interference data of the detection pulse signal, establish an analysis model, analyze the interference data of the detection pulse signal through the analysis model, and determine whether the corresponding jammer channel number and effective bandwidth interval are interval boundary values; When the corresponding jammer channel number and effective bandwidth interval are not interval boundary values, a new detection pulse signal is resent until all boundary values ​​of the jammer channel number interval and the effective bandwidth interval are obtained.

3. The anti-interference method based on the shield pulse according to claim 1 is characterized in that: The parameter data of the guard pulse signal include the frequency interval between the guard pulse signal and the effective pulse signal, the available frequency point number interval, and the relative amplitude interval between the guard pulse signal and the effective pulse signal.

4. The anti-interference method based on the shield pulse according to claim 1 is characterized in that: Methods for establishing parameter limits include: The frequency interval between the guard pulse signal and the effective pulse signal is marked as Δf o The available frequency points of the cover pulse signal are marked as T y , the formula D>T y , as the first-level limiting condition, the second-level limiting condition is formulated according to the transmission conditions of the actual cover pulse signal and the effective pulse signal, and the first-level limiting condition and the second-level limiting condition are integrated and marked as parameter limiting conditions.

5. The anti-interference method based on the shield pulse according to claim 1 is characterized in that: The cosine similarity function is 6. The anti-interference method based on the shield pulse according to claim 5, characterized in that: i and j are respectively similarity vectors of the cover pulse signal parameter data i and the corresponding data j in the cover pulse signal historical transmission scheme; the similarity vector includes: index one, index two and index three.

7. The anti-interference method based on the shield pulse according to claim 6 is characterized in that: Get the interest function value w ij The methods include: Create a similarity vector triple (x1, x2, x3), and determine the interest function based on indicators one, two, and three:

8. The anti-interference method based on the shield pulse according to claim 7, characterized in that: α1, α2, and α3 are adjustment coefficients, and the value range of α1, α2, and α3 is [0, 1].

9. The anti-interference method based on the shield pulse according to claim 1, characterized in that: Through the interest function value w ij Methods for screening reference solutions include: Set the similarity standard value X1, according to the formula Q = |w ij -X1|Get the deviation value Q, and select the interest function value w corresponding to the smallest deviation value Q ij , get the corresponding reference plan.

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