A method and system for designing low-interception point beam of radio fuze based on FDA-MIMO

Abstract

The present invention discloses a method and system for designing a low-intercept point beam of a radio fuze based on FDA-MIMO. First, the parameters of the radio fuze are obtained, and the beam amplitudes of the peak point H of FDA-MIMO and the point H' at a distance from the peak point are determined based on the obtained parameters. Finally, the frequency deviation value of the point beam synthesis is determined based on the power drop point, and the design of the low-intercept point beam of the radio fuze is completed. The scheme of the present invention sets the peak point and the power drop point within a relatively close distance range, so that the beam amplitude is large in a small neighborhood with a radius near the peak point, and the beam amplitude decreases rapidly in other ranges. Then, the beam function is used to solve the frequency deviation of each array element, and the low-intercept point beam design principle with the array element frequency deviation setting formula as the core is obtained. The beam convergence performance and low interception performance of this scheme are significantly better than other classical frequency deviation setting methods, and the low interception performance of the radio fuze can be significantly improved.

Description

Technical Field

[0001] The invention belongs to the field of low-interception anti-interference of radio fuzes, and in particular relates to a method and system for designing low-interception point beams of radio fuzes based on FDA-MIMO. Background Art

[0002] As an important component type of fuze, radio fuze has become the most widely used proximity fuze at this stage due to its simple structure, good precision ranging performance and ability to effectively strike air and ground targets.

[0003] At present, in order to achieve precision in the system under the control of radio fuze, higher requirements are put forward for the various performances of the fuze, especially the anti-interference performance. In the modern environment, the electromagnetic environment is becoming more and more complex, and the radio fuze has to face a variety of electromagnetic interference, especially the forwarding deception interference implemented by the fourth-generation fuze jammer based on radio frequency storage technology, which can easily cause the radio fuze to fail prematurely. Therefore, it is urgent to study the important issue of radio fuze anti-forwarding deception interference and improve the ability of radio fuze to resist information interference.

[0004] In recent years, scholars have conducted relevant research on the anti-information interference of radio fuzes, which can be roughly divided into three categories, namely, single-mode anti-interference based on radio signals, multi-mode anti-interference based on "radio signals + X", and cognitive anti-interference. In terms of single-mode anti-interference based on radio signals, it mainly includes: ① frequency agility and phase agility; ② from the perspective of low interception, the principle of RF signal energy being absorbed when the RF signal frequency is close to the resonance frequency of water molecules and oxygen molecules in the atmosphere is used to select the detection signal frequency of the radio fuze in the frequency band with large signal attenuation to improve the low interception performance of the fuze. However, it should be noted that with the rapid development of RF components, fuze jammers are also equipped with high-sensitivity receiving systems. When radio fuzes face high-sensitivity fuze jammers, the fuze signals will still be intercepted and forwarded by the jammers, causing the radio fuzes to be interfered and difficult to work normally. In terms of multimodal anti-interference based on "radio signal + X", it is mainly to combine radio detection with other proximity detection technologies, use multiple sensors to analyze signals in different domains, and only when the target signals output by different sensors match, can the detonation signal be output. At present, the main research is on multimodal fuzes of "radio signal + laser signal". However, in engineering practice, multimodal fuzes require more space volume because they need to design transceiver modules with more than two different signal systems, and the small space of the fuze has become an important constraint on the development of multimodal fuzes. In terms of cognitive anti-interference, neural networks can be used to learn signal features, and then distinguish interference signals from real echo signals in simulations and experiments to achieve the goal of fuze anti-interference. A fully convolutional time-domain audio separation network is constructed to solve the interference separation problem when the target echo is mixed with self-defense interference, and the deep Q neural network (DQN network) technology is applied to cognitive fuzes, a fuze flight state change scenario is constructed, and an intelligent anti-forwarding deception interference waveform design method based on the DQN network is proposed. However, the fuze requires a lot of computing resources in the process of cognition-decision-confrontation-evaluation, while the computing resources of the fuze are limited and there is a serious computing resource gap. Therefore, while studying cognitive anti-interference, it is also necessary to study lightweight algorithms suitable for fuzes. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a method and system for designing a low-intercept point beam of a radio fuze based on FDA-MIMO. By studying the frequency-controlled array-multiple-input multiple-output (MIMO) beam diagram function, focusing on the influence of the frequency offset setting of each array element on the beam synthesis, an array element frequency offset setting formula is proposed to enable the FDA-MIMO array to synthesize the best point beam in space, significantly improving the anti-interception performance, and further guiding the low-intercept beam design of the radio fuze based on FDA-MIMO technology to reduce the probability of being intercepted.

[0006] The specific technical solution for achieving the purpose of the present invention is:

[0007] A method for designing a low interception point beam of a radio fuze based on FDA-MIMO includes the following steps:

[0008] Step 1, obtaining the parameters of the radio fuze;

[0009] Step 2: Determine the peak point H and distance peak point of FDA-MIMO based on the obtained parameters The beam amplitude at the H' point of distance;

[0010] Step 3: Determine the frequency deviation value of the point beam synthesis based on the power drop point to complete the low intercept point beam design of the radio fuze.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] This scheme is based on the workflow of the fuze jammer intercepting first and then forwarding the interference, focusing on the low interception beam design of the radio fuze, and combining the unique "S"-shaped curved array pattern of FDA-MIMO technology to explore the design principle of low interception point beam of radio fuze based on FDA-MIMO. After analyzing the beam function of FDA-MIMO, the key point is the influence of the frequency deviation setting of the array element on the beam synthesis. By setting the peak point and the power drop point in a relatively close distance range ( ) to achieve near the peak point The beam amplitude is large in a small neighborhood with a radius, and the beam amplitude drops rapidly in other ranges. Then, the beam function is used to solve the frequency deviation of each array element, and the low interception point beam design principle with the array element frequency deviation setting formula as the core is obtained. Under the guidance of the low interception point beam design principle proposed in the present invention, the FDA-MIMO beam has a half-power beam width of 1 meter in the distance dimension and a half-power beam width of 9 degrees in the angle dimension. The beam focusing performance and low interception performance are significantly better than other classic frequency deviation setting methods, which can significantly improve the low interception performance of the radio fuse.

[0013] The present invention is further described below in conjunction with specific implementation modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a simple logic diagram for deriving and proving the low interception point beam design method of the radio fuze based on FDA-MIMO in this scheme.

[0015] Figure 2 This is a flow chart of the design method of low interception point beam of radio fuse based on FDA-MIMO in this scheme. DETAILED DESCRIPTION

[0016] Example

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. 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.

[0018] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an kind" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0020] The present invention adopts the idea of ​​inductive proof. The first step is to deduce the influence of frequency offset setting on point beam synthesis in the special case of two array elements. Then the second step is to deduce the influence of frequency offset setting on point beam synthesis in the case of three array elements. Finally, the third step is to deduce the influence of frequency offset setting of each array element on point beam synthesis in the case of M array elements. The logic diagram of derivation and proof is shown in the attached figure. Figure 1 As shown. The beam function of FDA-MIMO is:

[0021]

[0022] Considering that in the beam function, the time variable has no effect on the derivation of the entire formula, the following formula is derived at time t=0 and will not be repeated in the following text.

[0023] The frequency offset setting formula for achieving point beamforming in the case of two array elements is derived (10dB power drop point):

[0024] Assuming that the peak point of FDA-MIMO is point H, the beam amplitude at point H is:

[0025]

[0026] Then, at a distance of H of The beam amplitude at a point is:

[0027]

[0028] Let us assume Point is the 10dB power drop point, point H is Distance of points is extremely small, then the beam approaches a point beam. Therefore,

[0029]

[0030] Simplified,

[0031]

[0032] therefore,

[0033]

[0034] In actual work, the fuze works at the end of the actuator's flight. Usually, the angle between the actuator and the ground is large and close to vertical, so the angle between the fuze detection beam and the ground normal is Very small, Considering that the detection range of the radio fuze is about 200 meters and Very small, so , , .

[0035] so,

[0036]

[0037]

[0038]

[0039] Therefore, the formula exp(x) can be expressed as the first-order Talor expansion of the exponential function at x=0, that is

[0040]

[0041] So, the formula The first-order Talor expansion at x=0 is

[0042]

[0043] Because in the formula middle ,so

[0044]

[0045] so,

[0046]

[0047]

[0048] because is very small and can be ignored. Transformed into:

[0049]

[0050] Simplified The frequency deviation can be calculated :

[0051]

[0052] Among them, the first array element is the reference array element, so there is no frequency deviation;

[0053] By It can be seen that in the case of two array elements, when the frequency offset design is based on the formula FDA-MIMO can form a low interception point beam.

[0054] Derive the frequency offset setting formula for achieving point beamforming in the case of three array elements (10dB power drop point)

[0055] Assuming that the peak point of FDA-MIMO is point H, the beam amplitude at point H is:

[0056]

[0057] Then, at a distance of H of The beam amplitude at a point is:

[0058]

[0059] Let us assume Point is the 10dB power drop point, point H is Distance of points is extremely small, then the beam approaches a point beam. Therefore,

[0060]

[0061] Simplified,

[0062]

[0063] therefore,

[0064]

[0065] Referring to the approximate conditions of the two-element case, exp(x) can be expressed as the first-order Talor expansion of the exponential function at x=0, so The first-order Talor expansion at x=0 is:

[0066]

[0067] Because in the formula middle ,so

[0068]

[0069] So, the formula middle Substitution We can get:.

[0070]

[0071] Among them, the first array element is the reference array element, so there is no frequency deviation;

[0072] By It can be seen that in the case of three array elements, when the frequency deviation design is based on the formula FDA-MIMO can form a low interception point beam.

[0073] Based on the above content, the frequency offset setting formula for achieving point beam synthesis in the case of M array elements is derived;

[0074] Combination Figure 2 , a method for designing a low intercept point beam of a radio fuze based on FDA-MIMO, comprising the following steps:

[0075] Step 1: Obtain the parameters of the radio fuze, including the center frequency of the radio fuze. , the number of array elements M, the array element spacing d, the distance between the power drop point and the peak point , the expected convergence position of the spot beam ;

[0076] Step 2: Determine the peak point H and distance peak point of FDA-MIMO based on the obtained parameters Beam amplitude at point H' at distance:

[0077]

[0078]

[0079] in, represents the frequency deviation setting value of the mth array element, represents the array element spacing, Indicates the distance from the desired convergence position of the point beam to the reference array element, represents the angle between the expected convergence position of the point beam and the array element, c represents the speed of light, M represents the total number of array elements, Indicates the distance between the power drop point and the peak point.

[0080] Step 3: Determine the frequency deviation value of the spot beam synthesis based on the power drop point to complete the low intercept spot beam design of the radio fuze:

[0081] Step 3-1: Determine the peak point H and the distance from the peak point based on the power drop point The beam amplitude ratio at the H' point of distance:

[0082] Assumptions is the power drop point, then when point H is Distance of points When the beam is extremely small, it approaches a point beam. At this time:

[0083]

[0084] Formula Japanese style Substitution have to:

[0085]

[0086] Step 3-2: Determine the setting formula of the frequency deviation value of the spot beam synthesis based on the detection distance of the radio fuse and simplify it:

[0087] Considering that in actual work, the detection range of radio fuze is about 200 meters and The fuze works at the end of the actuator's flight. Usually, the angle between the actuator and the ground is large and close to vertical, so the angle between the fuze detection beam and the ground normal is Very small, ,but: , , .

[0088] but

[0089]

[0090]

[0091] Therefore, the formula exp(x) can be expressed as the first-order Talor expansion of the exponential function at x=0, that is

[0092]

[0093] So the formula The first-order Talor expansion at x=0 is:

[0094]

[0095] Because in the formula middle ,so

[0096]

[0097] Pair Solving it, we can get:

[0098]

[0099] In addition, in the case of M-1 array elements, based on the above formula, the frequency offset setting formula for achieving point beam synthesis is obtained as follows:

[0100]

[0101] Step 3-3: Determine the frequency offset setting formula for point beamforming in the case of M array elements:

[0102] In the case of M array elements, the frequency offset setting formula for achieving point beam synthesis is obtained, that is, Substitution The frequency deviation setting formula can be obtained:

[0103] (37)

[0104] Among them, m is the array element sequence, m=2,3,4…M, is the reference element frequency deviation, so .

[0105] Furthermore, if the peak point H and the power drop point The distance is r ( ), then we need to To However, when r is large, it is no longer a point beam and is not within the scope of the present invention. Therefore, the present invention no longer solves the frequency deviation expression when the distance between the two points is r.

[0106] The present invention also provides a radio fuze low interception point beam design system based on FDA-MIMO, comprising the following modules:

[0107] Parameter acquisition module: used to obtain the parameters of the radio fuze;

[0108] Frequency deviation determination module: used to determine the frequency deviation value of point beam synthesis based on the power drop point, and complete the low intercept point beam design of the radio fuse.

[0109] The present invention also provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:

[0110] Step 1, obtaining the parameters of the radio fuze;

[0111] Step 2: Determine the peak point H and distance peak point of FDA-MIMO based on the obtained parameters The beam amplitude at the H' point of distance;

[0112] Step 3: Determine the frequency deviation value of the point beam synthesis based on the power drop point to complete the low intercept point beam design of the radio fuze.

[0113] The present invention also provides a computer storable medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0114] Step 1, obtaining the parameters of the radio fuze;

[0115] Step 2: Determine the peak point H and distance peak point of FDA-MIMO based on the obtained parameters The beam amplitude at the H' point of distance;

[0116] Step 3: Determine the frequency deviation value of the point beam synthesis based on the power drop point to complete the low intercept point beam design of the radio fuze.

[0117] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A method for designing low intercept point beam of radio fuze based on FDA-MIMO, characterized in that: The following steps are involved: Step 1: Obtain the parameters of the radio fuze, including the center frequency of the radio fuze , the number of array elements M, the array element spacing d, the distance between the power drop point and the peak point , the expected convergence position of the spot beam ; Step 2: Determine the peak point H and distance peak point of FDA-MIMO based on the obtained parameters Beam amplitude at point H' at distance: ； ； in, represents the frequency deviation setting value of the mth array element, represents the array element spacing, Indicates the distance from the desired convergence position of the point beam to the reference array element, represents the angle between the expected convergence position of the point beam and the array element, c represents the speed of light, M represents the total number of array elements, Indicates the distance between the power drop point and the peak point; Step 3: Determine the frequency deviation value of the spot beam synthesis based on the power drop point to complete the low intercept spot beam design of the radio fuze: Step 3-1: Determine the peak point H and the distance from the peak point based on the power drop point The beam amplitude ratio at the H' point of distance: Assumptions is the power drop point, then when point H is Distance of points When the beam is extremely small, it approaches a point beam. At this time: ； but: ； Step 3-2: Determine the setting formula of the frequency deviation value of the spot beam synthesis based on the detection distance of the radio fuse and simplify it: In actual work, the H point and Distance of points Minimum, angle between the fuze detection beam and the ground normal Very small, then: , , , then the beam amplitude ratio formula is transformed to obtain the frequency offset setting formula for the Mth array element: ； Step 3-3: Determine the frequency offset setting formula for point beamforming in the case of M array elements: ； Where m is the array element sequence, m=2,3,4…M, is the reference element frequency deviation, so .

2. A radio fuze low interception spot beam design system based on FDA-MIMO, used to execute the method described in claim 1, characterized in that: Includes the following modules: Parameter acquisition module: used to obtain the parameters of the radio fuze; Frequency deviation determination module: used to determine the frequency deviation value of point beam synthesis based on the power drop point, and complete the low intercept point beam design of the radio fuse.

3. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to claim 1 are implemented.

4. A computer storable medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to claim 1 are implemented.

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