Cross-eye interference baseline length determination method and system based on large-size platform

Abstract

The present invention relates to a method and system for determining the length of a cross-eye interference baseline based on a large-size platform, and specifically to the field of radar countermeasure technology. The method comprises: determining a first value range of the longest interference baseline length based on the amplitude ratio of two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the killing radius of the combat object, etc.; determining a second value range of the longest interference baseline length based on the amplitude ratio of two interference sources in each interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the shortest effective distance of the radar, the radar half-power beam width, etc.; determining the interference baseline length of each interference loop according to the first value range and the second value range. The present invention can determine the cross-eye interference baseline length of a large-size platform.

Description

Technical Field

[0001] The present invention relates to the field of radar countermeasure technology, and in particular to a method and system for determining a cross-eye interference baseline length based on a large-size platform. Background Art

[0002] In modern warfare, fire control radars and guidance radars pose a great threat to aircraft, ships and other weapon platforms. How to reduce the effectiveness of enemy fire control radars and guidance radars is a research hotspot in the field of electronic warfare. Excellent angle measurement characteristics are the basis for the realization of the functions of fire control radars and guidance radars, so angle deception interference against fire control radars and guidance radars is one of the key research directions.

[0003] Fire control radars and guidance radars generally use a single pulse angle measurement system, which has the advantages of high angle measurement accuracy and strong anti-interference ability. Cross-eye interference, as the most effective technology to counter the single pulse angle measurement system, has been the focus of domestic and foreign scholars since it was proposed in 1958. According to existing public literature, cross-eye interference has been applied on aircraft, but is still in the test and demonstration stage on large-scale platforms such as ships. One of the key reasons for this phenomenon is that the determination of the baseline length of cross-eye interference on large-scale platforms is still in the research stage.

[0004] The current mature theory for determining the length of the cross-eye interference baseline is that the longer the interference baseline is, the greater the error angle that the cross-eye interference can cause, and the better the interference effect. Based on this theory, on an aircraft, the two antenna pairs of the cross-eye interference are usually placed at the two wingtips to maximize the cross-eye interference baseline length (i.e., the distance between the two antenna pairs).

[0005] However, if two antenna pairs are placed at the two ends of a large-sized platform (such as the bow and stern of a ship) in the same way as an aircraft model, problems will arise. For example, because the two antenna pairs are too far apart and the radar beam width is limited, when the radar is far away from the large-sized platform, the interference signals of the two antenna pairs cannot enter the radar at the same time. At this time, the interference is no longer cross-eye interference, and it cannot effectively interfere with the radar using a single-pulse angle measurement system.

[0006] It can be seen that when determining the interference baseline length of cross-eye interference on a large-size platform, in addition to meeting the error angle requirements, other indicators must be considered and the relationship between these indicators and the cross-eye interference baseline length must be determined. However, there is no literature that explains this in detail, which leads to a lack of basis for determining the cross-eye interference baseline length on a large-size platform, and the cross-eye interference on a large-size platform is difficult to achieve the purpose of protecting the large-size platform. Summary of the invention

[0007] The purpose of the present invention is to provide a method and system for determining the cross-eye interference baseline length based on a large-size platform, which can provide a basis for determining the cross-eye interference baseline length on a large-size platform to a certain extent, thereby improving the interference effect of the cross-eye interference on the large-size platform.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] A method for determining the length of a cross-eye interference baseline based on a large-size platform, comprising:

[0010] Acquire the wavelength of radar signal, the difference in distance between two antenna pairs relative to the radar when each interference loop receives radar signal and transmits interference signal, the ratio of interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives radar signal and transmits interference signal, the amplitude ratio of two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the killing radius of the combat object, the shortest effective range of the radar and the radar half-power beam width; the cross-eye interference system includes a plurality of the interference loops, and one interference loop includes two antenna pairs;

[0011] Determine a first value range of the longest interference baseline length of the cross-eye interference system based on the radar signal wavelength, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and when it transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and when it transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, and the combat target killing radius;

[0012] Determine a second value range of the longest interference baseline length of the cross-eye interference system based on the wavelength of the radar signal, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the shortest effective range of the radar and the radar half-power beamwidth;

[0013] The cross-eye interference baseline length of each interference loop of the cross-eye interference system is determined according to the first value range and the second value range.

[0014] A cross-eye interference baseline length determination system based on a large-size platform, comprising:

[0015] An acquisition module is used to acquire the wavelength of a radar signal, the difference in distance between two antenna pairs relative to the radar when each interference loop receives a radar signal and when it transmits an interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of a cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives a radar signal and when it transmits an interference signal, the amplitude ratio of two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives a radar signal sent by the radar, the killing radius of the combat object, the shortest effective range of the radar and the radar half-power beamwidth; the cross-eye interference system includes a plurality of the interference loops, and one interference loop includes two antenna pairs;

[0016] A first value range determination module is used to determine a first value range of the longest interference baseline length of the cross-eye interference system based on the radar signal wavelength, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and when it transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and when it transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, and the killing radius of the combat object;

[0017] A second value range determination module is used to determine the second value range of the longest interference baseline length of the cross-eye interference system based on the radar signal wavelength, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the shortest effective range of the radar and the radar half-power beamwidth;

[0018] A cross-eye interference baseline length determination module is used to determine the cross-eye interference baseline length of each interference loop of the cross-eye interference system according to the first value range and the second value range.

[0019] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: the present invention determines the cross-eye interference baseline length of each interference loop of the cross-eye interference system on a large-scale platform according to the wavelength of the radar signal, the difference in the distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and when the interference signal is transmitted, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in the angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and when the interference signal is transmitted, the amplitude ratio of the two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the killing radius of the combat object, the shortest effective range of the radar and the radar half-power beamwidth, thereby improving the interference effect of the cross-eye interference on the large-scale platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 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 labor.

[0021] Figure 1 A flow chart of a method for determining the length of a cross-eye interference baseline based on a large-size platform provided in an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the spatial position relationship between the cross-eye jammer antenna and the radar provided in an embodiment of the present invention;

[0023] Figure 3 A block diagram of a single interference loop of cross-eye interference provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the spatial position relationship between two-source reverse cross-eye interference and radar provided in an embodiment of the present invention;

[0025] Figure 5 For m = 10 -8 , n = 10 -14 When , the relationship curve between the closest error distance and the interference baseline length;

[0026] Figure 6 For m = 10 -6 , n = 10 -8 When , the relationship curve between the closest error distance and the interference baseline length;

[0027] Figure 7For m = 10 -8 , n = 10 -14 When , the relationship curve between the error angle and the interference baseline length;

[0028] Figure 8 For m = 10 -6 , n = 10 -8 The relationship between the error angle and the interference baseline length is shown in the figure. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] The embodiment of the present invention provides a method for determining the cross-eye interference baseline length based on a large-size platform, such as Figure 1 As shown, including:

[0032] Step 101: obtaining the wavelength of the radar signal, the difference in the distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in the angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the distance between the radar and any interference loop (the distance between the radar and the interference loop is the distance from the radar to the vertical line of the interference loop, and each interference loop is distributed on a straight line, so this distance is the same for each interference loop, so it is enough to obtain one here), the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the killing radius of the combat object, the shortest effective range of the radar and the radar half-power beamwidth; the cross-eye interference system (arranged on a large-size platform) includes a plurality of the interference loops, one of the interference loops includes two antenna pairs, and one of the antenna pairs includes two antennas, one for receiving radar signals and one for transmitting interference signals.

[0033] Step 102: Determine a first value range of the longest interference baseline length of the cross-eye interference system based on the radar signal wavelength, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, and the combat target killing radius.

[0034] Step 103: Determine a second value range of the longest interference baseline length of the cross-eye interference system based on the wavelength of the radar signal, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the shortest effective range of the radar and the radar half-power beamwidth.

[0035] Step 104: Determine the cross-eye interference baseline length of each interference loop of the cross-eye interference system according to the first value range and the second value range. For a multi-source linear array reverse cross-eye interference system, the interference baseline length of each interference loop has a definite relationship with the longest interference baseline length of the cross-eye interference system (i.e., the interference baseline length of the first interference loop), which is generally a linear relationship. Therefore, when the longest interference baseline length of the cross-eye interference system is determined, the interference baseline lengths of other interference loops are also determined.

[0036] In practical applications, the cross-eye jammer antenna is a multi-source linear array reverse cross-eye jammer structure. Compared with multi-source reverse cross-eye jammers in the form of orthogonal linear arrays, circular arrays, etc., the structure of multi-source linear array reverse cross-eye jammers is more suitable for large-scale platform construction and is more suitable for layout and use on large-scale platforms.

[0037] In practical applications, the first value range of the longest interference baseline length of the cross-eye interference system is determined based on the radar signal wavelength, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, and the killing radius of the combat object, specifically including:

[0038] According to the first range formula

[0039]

[0040]

[0041] Determine the first value range of the longest interference baseline length of the cross-eye jamming system; where r represents the distance between the radar and any jamming loop, θ R It represents the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye jammer receives the radar signal sent by the radar. n represents the total number of jammer loops in the cross-eye jammer system. represents the real part, k i It represents the ratio of the interference baseline length of the ith interference loop to the longest interference baseline length of the cross-eye interference system, α i represents the amplitude ratio of the two interference sources in the ith interference loop, j represents the imaginary part, λ represents the wavelength of the radar signal, and f(k i ·d1) represents the difference in distance between the two antenna pairs relative to the radar when the i-th jamming loop receives the radar signal and when it transmits the jamming signal. d1 represents the longest interference baseline length of the cross-eye jamming system. g(k i ·d1) represents the difference in angle between the line connecting the two antenna pairs and the signal wavefront when the i-th interference loop receives the radar signal and transmits the interference signal, and R0 represents the killing radius of the combat target.

[0042] In practical applications, the second value range of the longest interference baseline length of the cross-eye interference system is determined based on the radar signal wavelength, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the shortest effective range of the radar and the radar half-power beamwidth, specifically including: according to the second range formula

[0043]

[0044] Determine the second value range of the longest interference baseline length of the cross-eye interference system; wherein d1 represents the longest interference baseline length of the cross-eye interference system, R L represents the shortest range of the radar, n represents the total number of interference loops in the cross-eye interference system, represents the real part, α i represents the amplitude ratio of the two interference sources in the ith interference loop, j represents the imaginary part, λ represents the wavelength of the radar signal, and f(k i ·d1) represents the difference in distance between the two antenna pairs relative to the radar when the i-th interference loop receives the radar signal and when it transmits the interference signal, θ R k represents the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar. i represents the ratio of the interference baseline length of the ith interference loop to the longest interference baseline length of the cross-eye interference system, g(k i ·d1) represents the difference in angle between the line connecting the two antenna pairs and the signal wavefront when the i-th interference loop receives the radar signal and transmits the interference signal, θ 0.5 Indicates the radar half-power beamwidth.

[0045] In practical applications, the process of determining the first range formula is:

[0046] Step 1: Establish a calculation model for the additional spatial phase shift of each interference loop of cross-eye interference:

[0047] like Figure 2As shown in the figure, if the cross-eye jamming antenna jamming fails, the radar tracks the center of the cross-eye jamming antenna, that is, the center of the cross-eye jamming antenna is the real target, represented by a solid box; if the cross-eye jamming is successful, the radar will track the apparent false target, and the hollow box represents the radar's apparent false target. O represents the location of the radar, A and B represent the positions of the two ends of the cross-eye jamming antenna (that is, the positions of the two antenna pairs that form the longest baseline of the cross-eye jamming), and C represents the position of the apparent false target.

[0048] Assume that the cross-eye jamming system consists of n jamming loops, and the structure of each jamming loop is as follows: Figure 3 Each interference loop consists of two antenna pairs. The distance between the two antenna pairs is the interference baseline length of the interference loop. Figure 3 They are represented as 1# antenna pair and 2# antenna pair respectively.

[0049] Assume that the error angle caused by cross-eye jamming is θ, and the angle of the cross-eye jamming antenna relative to the radar is θ b ,θ e is the half angle, the distance between the radar and any interference loop is r, and the interference baseline lengths of the n interference loops are d1, d2, …, d n ,like Figure 2 As shown. For the multi-source linear array reverse cross-eye jammer system, d1, d2, …, d n There is a certain linear relationship between them. Suppose the interference baseline length d of the i-th interference loop i The relationship between the longest interference baseline length d1 of the cross-eye interference system is d i =k i d1, where k i Determining the interference baseline length of the cross-eye interference is actually determining the length of d1, that is, the distance between the two farthest antenna pairs in the cross-eye interference system.

[0050] Due to the inevitable relative motion between the interference source and the radar and tactical actions, the distance between the two antenna pairs of each interference loop will change relative to the radar. Suppose the distance between the two antenna pairs when the i-th interference loop receives the radar signal is d i , the distance between the two antenna pairs when transmitting the interference signal is d i ', then d i ≠d i '. Similarly, the angle between the line connecting the two antenna pairs and the signal wavefront when receiving radar signals is different from the angle between the line connecting the two antenna pairs and the signal wavefront when transmitting interference signals. Because the radar is located in the far field of the interference source, it can be approximately assumed that the wavefronts of the radar signals received by each interference loop are parallel. Therefore, it can be assumed that the angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal is θ RWhen each interference loop transmits an interference signal, the angle between the two antenna pairs and the signal wavefront is θ J , then θ R ≠θ J .set up:

[0051]

[0052] Δd i It represents the difference in distance between the two antenna pairs relative to the radar when the i-th interference loop receives the radar signal and when it transmits the interference signal, Δθ i It represents the difference in angle between the line connecting the two antenna pairs and the signal wavefront when the i-th interference loop receives the radar signal and transmits the interference signal.

[0053] Depend on Figure 3 It can be seen that when receiving radar signals, due to θ R The existence of, and the distance d between the two antenna pairs i , there is a spatial phase shift φ between the radar signals received by the two antenna pairs i :

[0054] Similarly, when transmitting interference signals, due to θ J and d i ', there is a spatial phase shift φ between the interference signals transmitted by the two antenna pairs i ':

[0055] Due to d i ≠d i ' and θ R ≠θ J , which should be offset by the reverse cross-eye structure i and φ i 'It is not completely cancelled, resulting in an additional spatial phase shift Δφ between the interference signals transmitted by the two antenna pairs i :

[0056]

[0057] Substituting equation (1) into equation (2) and expanding it, we obtain:

[0058]

[0059] Considering Δθ i is very small. In the derivation of the above formula, cosΔθ is used. i ≈1 and sinΔθ i ≈Δθ i Further, ignoring the second-order small term Δd i sinθ R ·Δθi , we can get:

[0060]

[0061] Under the same conditions, d i The larger the Δd i and Δθ i The larger the value, the larger the Δd. i With d i , Δθ i With d i The relationship between i =f(d i ), Δθ i =g(d i ), further, by d i =k i ·d1 can be obtained:

[0062]

[0063] Substituting (4) and d i =k i Substituting d1 into formula (3) yields:

[0064]

[0065] Formula (5) is the calculation model of the additional spatial phase shift of the i-th interference loop of cross-eye interference.

[0066] Step 2: Find the shortest distance between the false target and the cross-eye jammer antenna:

[0067] The closest distance between the apparent false target and the cross-eye jammer antenna is Figure 2 The length of BC in. Figure 2 We can get:

[0068]

[0069] get:

[0070]

[0071] Step 3: Take the closest distance BC between the apparent false target and the cross-eye jamming antenna as greater than the killing radius of the combat target as the standard for the effectiveness of cross-eye jamming, and calculate the interference baseline length of the cross-eye jamming when the cross-eye jamming is effective. (Among the combat targets of large-sized platforms, the most threatening one is the missile, so the killing radius of the missile can be used as the evaluation standard, and the target of cross-eye jamming is the radar on the missile platform.)

[0072] To ensure effectiveness, the antenna of the cross-eye jammer is usually installed on one side of the large-sized platform. Therefore, the closest distance between the apparent false target and the cross-eye jammer antenna is the closest distance between the apparent false target and the large-sized platform. If this distance is greater than the killing radius of the combat target, the combat target cannot hit the large-sized platform.

[0073] Assuming the killing radius of the combat target is R0, the conditions for the effectiveness of cross-eye interference are:

[0074] BC>R0 (7)

[0075] Substituting (6) into (7) we can obtain:

[0076]

[0077] (8) where θ is the error angle caused by cross-eye interference, which is:

[0078]

[0079] (9) In the formula, α i is the amplitude ratio of the two interference sources in the ith interference loop, φ i is the phase difference between the two interference sources, θ e is half the angle. Figure 2 have: We can get:

[0080]

[0081] For cross-eye interference, the interference effect is best when φ i Equal to π, but due to the additional spatial phase shift Δφ i The existence of the actual φ i It is not equal to π, but φ i =π-Δφ i . i =π-Δφ i Substituting (10) into (9) yields:

[0082]

[0083] Substituting equations (5) and (11) into equation (8), we can obtain the first range formula:

[0084]

[0085] In the first range formula, the left side of the inequality is the closest distance between the apparent false target and the cross-eye jammer, which is also the closest distance between the apparent false target and the large-size platform. For the convenience of description, this distance is also referred to as the closest error distance below.

[0086] In the first range formula, n, ki is certain and known, f(k i ·d1), g(k i ·d1), α i It can be obtained by experimental method. R0 can be estimated based on the missile, then d1 is related to r and θ R In practice, d1 is fixed, while r and θ R will change with the movement of the missile. So we should R It is set, and then the value range of d1 is calculated by the first range formula. It can be considered that if a cross-eye interference system with a certain interference baseline length can still be effective in the most emergency situation of a missile attack, then the setting of such an interference baseline length is reasonable. The most emergency situation of a missile attack related to the present invention includes two aspects. On the one hand, it is the distance between the missile and the cross-eye interference antenna, and on the other hand, it is the angle between the missile attack direction and the cross-eye interference antenna. The present invention assumes that when the missile is at the closest startup distance of the cross-eye interference and in the direction of the horizontal mid-perpendicular line of the large-size platform, it is the most emergency situation. Suppose the closest startup distance of the cross-eye interference is R N , the total length of the large-size platform is L S , the cross-eye interference antenna is located on one side of the large-size platform, then: r = R N , Set r and θ R Substituting into the first range formula, we can solve the value range of d1 when cross-eye interference is effective. It should be noted that when f(k i ·d1), g(k i ·d1) are very small, the nearest error distance is linearly proportional to d1. The larger d1 is, the larger the nearest error distance is. In other words, the larger R0 is, the larger d1 is required. The lower limit of d1 is obtained according to the first range formula. When f(k i ·d1), g(k i When d1) is large, the nearest error distance is no longer linearly related to d1, and the value range of d1 needs to be determined according to the specific situation. i ·d1) and g(k i The value of d1) is determined by the control level of the amplitude and phase characteristics of the two antenna pairs of the interference loop, and the specific value can be obtained through experimental methods.

[0087] In practical applications, the second range formula is determined as follows:

[0088] Step 1: Establish a spatial relationship model between the radar and the large-size platform when the distance between the radar and the large-size platform is equal to the critical distance:

[0089] When the distance between the radar and the large-size platform is equal to the critical distance, one of the two antenna pairs of the first interference loop that is far away from the apparent false target (hereinafter referred to as the outer antenna, and the other antenna pair is referred to as the inner antenna) will be at the edge of the horizontal beam of the radar antenna; when the distance between the radar and the large-size platform is less than the critical distance, the outer antenna will be outside the edge of the horizontal beam of the radar antenna, and the first interference loop will lose its effect; as the distance between the radar and the large-size platform gets closer and closer, the outer antennas of each interference loop will lose their effect one after another, the apparent false target will get closer and closer to the real target, and finally the cross-eye interference will degenerate into single-point source interference. At this time, the cross-eye interference will not only fail to play an interference role, but will become a beacon of the radar.

[0090] Assume the radar half-power beamwidth is θ 0.5 According to the definition of critical distance and Figure 2 , when the distance between the radar and the large-size platform is equal to the critical distance, the spatial relationship between the radar and the large-size platform is:

[0091]

[0092] Step 2: Establish a brief calculation model for the critical distance, and then set the critical distance to be less than or equal to the lower limit of the radar range, and calculate the interference baseline length of the cross-eye interference at this time:

[0093] The radar's range has a lower limit. The critical distance should be less than or equal to the lower limit of the radar's range, so that the radar cannot detect large-sized platforms after the outer antenna of the cross-eye interference loses its function.

[0094] There are many factors that affect the critical distance, especially the dynamic processes such as the azimuth tracking of the radar, the azimuth tracking of the radar platform, and the coupling of the azimuth tracking of the radar and the azimuth tracking of the radar platform. Therefore, it is difficult to calculate the specific value of the critical distance through the calculation of a single model. In the present invention, a simple model is proposed and applied to calculate the critical distance, which is hereinafter referred to as the simple calculation model of the critical distance.

[0095] In the brief calculation model of the critical distance, at the initial moment, the radar platform is assumed to be at the cross-eye interference antenna (i.e. Figure 2 On the perpendicular bisector of AB), the radar antenna axis coincides with the perpendicular bisector; afterwards, the radar antenna axis generates an error angle under the action of cross-eye interference, but the radar platform always moves on the perpendicular bisector of the cross-eye interference antenna. In the simple calculation model of the critical distance, θ R =π / 2.

[0096] Assume that the lower limit of radar range is R L , let the critical distance be equal to R L ,but According to formula (13), to satisfy the critical distance less than or equal to the lower limit of the radar range, then:

[0097]

[0098] From equations (5), (10), (11) and (14), we can get the second range formula:

[0099]

[0100] In the second range formula, the left side of the inequality is Figure 2 For the convenience of description, the AC angle relative to the radar is also referred to as the error angle below.

[0101] In the second range formula, n, k i is certain and known, f(k i ·d1), g(k i ·d1), α i It can be obtained by experimental method, R L ,θ 0.5 It can be estimated based on the radar, and the value range of d1 can be solved by the second range formula. It should be noted that when f(k i ·d1), g(k i ·d1) are very small, Δφ i is also very small. At this time, the error angle is linearly proportional to d1. The larger d1 is, the larger the error angle is. The upper limit of d1 is obtained according to the second range formula. If the upper limit is exceeded, the critical distance will exceed the lower limit of the radar range, resulting in the radar still being able to detect large-size platforms after the external antenna of the cross-eye interference loses its function. When f(k i ·d1), g(k i When d1) is large, the error angle is no longer linearly related to d1, and the value range of d1 needs to be determined according to the specific situation.

[0102] In view of the above method, an embodiment of the present invention provides a cross-eye interference baseline length determination system based on a large-size platform, comprising:

[0103] The acquisition module is used to obtain the wavelength of the radar signal, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and when it transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and when it transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the killing radius of the combat object, the shortest effective range of the radar and the radar half-power beam width; the cross-eye interference system includes a plurality of the interference loops, and one interference loop includes two antenna pairs.

[0104] The first value range determination module is used to determine the first value range of the longest interference baseline length of the cross-eye interference system based on the radar signal wavelength, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and when it transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and when it transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, and the killing radius of the combat object.

[0105] The second value range determination module is used to determine the second value range of the longest interference baseline length of the cross-eye interference system based on the radar signal wavelength, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and when it transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and when it transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the shortest effective range of the radar and the radar half-power beamwidth.

[0106] A cross-eye interference baseline length determination module is used to determine the cross-eye interference baseline length of each interference loop of the cross-eye interference system according to the first value range and the second value range.

[0107] As an optional implementation manner, the first value range determination module specifically includes:

[0108] The first value range determining unit is used to determine the value range according to the first range formula.

[0109]

[0110] Determine the first value range of the longest interference baseline length of the cross-eye jamming system; where r represents the distance between the radar and any jamming loop, θ R It represents the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye jammer receives the radar signal sent by the radar. n represents the total number of jammer loops in the cross-eye jammer system. represents the real part, k i It represents the ratio of the interference baseline length of the ith interference loop to the longest interference baseline length of the cross-eye interference system, α i represents the amplitude ratio of the two interference sources in the ith interference loop, j represents the imaginary part, λ represents the wavelength of the radar signal, and f(k i ·d1) represents the difference in distance between the two antenna pairs relative to the radar when the i-th jamming loop receives the radar signal and when it transmits the jamming signal. d1 represents the longest interference baseline length of the cross-eye jamming system. g(k i ·d1) represents the difference in angle between the line connecting the two antenna pairs and the signal wavefront when the i-th interference loop receives the radar signal and transmits the interference signal, and R0 represents the killing radius of the combat target.

[0111] As an optional implementation manner, the second value range determination module specifically includes:

[0112] The second value range determination unit is used to determine the value range of the second range according to the second range formula.

[0113]

[0114] Determine the second value range of the longest interference baseline length of the cross-eye interference system; wherein d1 represents the longest interference baseline length of the cross-eye interference system, R L represents the shortest range of the radar, n represents the total number of interference loops in the cross-eye interference system, represents the real part, α i represents the amplitude ratio of the two interference sources in the ith interference loop, j represents the imaginary part, λ represents the wavelength of the radar signal, and f(k i ·d1) represents the difference in distance between the two antenna pairs relative to the radar when the i-th interference loop receives the radar signal and when it transmits the interference signal, θ R k represents the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar. i represents the ratio of the interference baseline length of the ith interference loop to the longest interference baseline length of the cross-eye interference system, g(k i ·d1) represents the difference in angle between the line connecting the two antenna pairs and the signal wavefront when the i-th interference loop receives the radar signal and transmits the interference signal, θ 0.5Indicates the radar half-power beamwidth.

[0115] A more specific embodiment of applying the above method is given below.

[0116] In this embodiment, the cross-eye interference is a two-source reverse cross-eye interference, which has only one interference loop, that is, only two antenna pairs and one baseline. Figure 4 shown.

[0117] (1) Establish a calculation model for the additional spatial phase shift of two antenna pairs due to cross-eye interference:

[0118] Assume that the error angle caused by cross-eye jamming is θ, and the angle of the cross-eye jamming antenna relative to the radar is θ b ,θ e is the half angle, the distance between the radar and the interference loop is r, and the distance between the two antenna pairs (i.e., the interference baseline length) is d. Determining the interference baseline length of cross-eye interference is actually determining the length of d.

[0119] Assume that the distance between the two antenna pairs when receiving radar signals is d, and the angle between the line connecting the two antenna pairs and the signal wavefront is θ R , the distance between the two antenna pairs when transmitting the interference signal is d', and the angle between the line connecting the two antenna pairs and the signal wavefront is θ J ,and Assume that Δθ and Δd are linearly related to d, and Δd = m·d, Δθ = n·d. Since there is only one interference loop (including two antenna pairs), k in formula (5) is i ·d1=d, then the calculation model of the additional spatial phase shift can be obtained from equation (5):

[0120]

[0121] (2) Find the shortest distance between the false target and the cross-eye jammer antenna:

[0122] The closest distance between the apparent false target and the cross-eye jammer antenna is Figure 4 The length of BC is obtained by formula (6).

[0123] (3) Taking the minimum distance between the apparent false target and the cross-eye jamming antenna as greater than the killing radius of the combat target as the standard for the effectiveness of cross-eye jamming, calculate the interference baseline length of the cross-eye jamming when the cross-eye jamming is effective; for the two-source reverse cross-eye jamming, the error angle θ is:

[0124]

[0125] In formula (17), α is the amplitude ratio of the two interference sources, and φ is the phase difference between the two interference sources. When the interference effect is optimal, φ is required to be equal to π, but due to the existence of the spatial additional phase shift Δφ, the actual φ is not equal to π, but φ = π-Δφ. Substituting φ = π-Δφ and formula (10) into formula (17), we can obtain:

[0126]

[0127] Assume the total length of the large-size platform is L S , the cross-eye interference antenna is located on one side of the large-size platform, then:

[0128]

[0129] Substituting (19) into (18), we can obtain:

[0130]

[0131] Assume that the killing radius of the combat target is R0, r is equal to the closest start-up distance R of the cross-eye interference N According to the effective condition of cross-eye interference (8), substituting (19) and (20) into (8) and simplifying, we can obtain:

[0132]

[0133] Assume R N =2000m, L S =150m, α=0.65, λ=0.03m, R0=40m. m represents the length unit meter. Then two cases are discussed.

[0134] 1) When m and n are small, so that the nearest error distance is linearly proportional to d:

[0135] Let m = 10 -8 , n = 10 -14 (These two values ​​are estimates based on the assumption that the cross-eye jammer system is composed of ideal components, the large-size platform is a ship, and only the rolling motion of the ship is considered). Draw a curve showing the relationship between the closest error distance and d at this time, as shown in Figure 5 As shown, we can solve: d>21.54m.

[0136] 2) When m and n are large, so that the nearest error distance is not linearly related to d:

[0137] Let m = 10 -6 , n = 10 -8 , draw the relationship curve between the nearest error distance and d at this time, such as Figure 6 shown.

[0138] To satisfy equation (21), we can solve: 23.5<d<39.41m.

[0139] (4) Establish a spatial relationship model between the radar and the large-size platform when the distance between the radar and the large-size platform is equal to the critical distance, which is obtained by formula (13).

[0140] (5) According to the brief calculation model of the critical distance, let the critical distance be less than or equal to the lower limit of the radar range, and calculate the interference baseline length of the cross-eye interference at this time;

[0141] According to the brief calculation model of critical distance, According to equations (14), (16), (17) and φ = π - Δφ, We can get:

[0142]

[0143] Assume the lower limit of radar range R L =1600m, radar half-power beamwidth is θ 0.5 =5°, then The following is a discussion of the two situations in (3) above.

[0144] 1) When m = 10 -8 , n = 10 -14 When , the error angle is linearly related to d, such as Figure 7 shown.

[0145] Now we can solve: d≤24.42m.

[0146] 2) When m = 10 -6 , n = 10 -8 When , the error angle has a nonlinear relationship with d, such as Figure 8 shown.

[0147] At this time, the solution is: d≤26.77m or 55.19m<d≤114.3m.

[0148] (6) The interference baseline lengths obtained from (3) and (5) are combined to obtain the selection range of the cross-eye interference baseline length.

[0149] For case 1) in (3) and (5), we can obtain: 21.54m<d≤24.42m.

[0150] For case 2) in (3) and (5), we can obtain: 23.5<d<26.77m.

[0151] The present invention has the following technical effects:

[0152] (1) The present invention provides a method for determining the length of a cross-eye interference baseline suitable for a large-scale platform. The method comprehensively considers the characteristics of the large-scale platform, the characteristics of the cross-eye interference combat target, the relationship between the large-scale platform and the cross-eye interference combat target, and other actual conditions. The method includes important actual factors such as error angle, phase difference, and critical distance. The method can be used as a basis for determining the length of the cross-eye interference baseline on a large-scale platform in practice, and also creates conditions for the success of cross-eye interference.

[0153] (2) The present invention provides a mathematical model for determining the length of the cross-eye interference baseline on a large-size platform, which can be directly used for calculations and is easy to use, flexible, fast, and cost-effective: as long as the relevant parameters are set and the value range of the interference baseline length is obtained through computer calculation.

[0154] (3) In the present invention, the additional spatial phase shift of each interference loop is taken into account when calculating the error angle and the critical distance, so that the obtained mathematical model is more precise and the calculation result is more accurate; and because the additional spatial phase shift is taken into account, the simple understanding that the error angle and the critical distance are both linearly related to the interference baseline length is overturned, and the theoretical level of the selection of the cross-eye interference baseline length is improved.

[0155] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0156] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for determining the length of a cross-eye interference baseline based on a large-size platform, characterized in that: include: Acquire the wavelength of radar signal, the difference in distance between two antenna pairs relative to the radar when each interference loop receives radar signal and transmits interference signal, the ratio of interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives radar signal and transmits interference signal, the amplitude ratio of two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the killing radius of the combat object, the shortest effective range of the radar and the radar half-power beam width; the cross-eye interference system includes a plurality of the interference loops, and one interference loop includes two antenna pairs; Determine a first value range of the longest interference baseline length of the cross-eye interference system based on the wavelength of the radar signal, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and when it transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and when it transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, and the combat target killing radius; Determine a second value range of the longest interference baseline length of the cross-eye interference system based on the wavelength of the radar signal, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the shortest effective range of the radar and the radar half-power beamwidth; Determine the cross-eye interference baseline length of each interference loop of the cross-eye interference system according to the first value range and the second value range; The first value range of the longest interference baseline length of the cross-eye interference system is determined based on the radar signal wavelength, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and when it transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and when it transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, and the killing radius of the combat object, specifically including: According to the first range formula Determine the first value range of the longest interference baseline length of the cross-eye jamming system; where r represents the distance between the radar and any jamming loop, θ R It represents the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye jammer receives the radar signal sent by the radar. n represents the total number of jammer loops in the cross-eye jammer system. represents the real part, k i It represents the ratio of the interference baseline length of the ith interference loop to the longest interference baseline length of the cross-eye interference system, α i represents the amplitude ratio of the two interference sources in the ith interference loop, j represents the imaginary part, λ represents the wavelength of the radar signal, and f(k i ·d1) represents the difference in distance between the two antenna pairs relative to the radar when the i-th jamming loop receives the radar signal and when it transmits the jamming signal. d1 represents the longest interference baseline length of the cross-eye jamming system. g(k i d1) represents the difference in angle between the line connecting the two antenna pairs and the signal wavefront when the i-th interference loop receives the radar signal and transmits the interference signal, and R0 represents the killing radius of the combat target; The second value range of the longest interference baseline length of the cross-eye interference system is determined based on the radar signal wavelength, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and when it transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and when it transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the shortest effective range of the radar and the radar half-power beamwidth, specifically including: according to the second range formula Determine the second value range of the longest interference baseline length of the cross-eye interference system; wherein d1 represents the longest interference baseline length of the cross-eye interference system, R L represents the shortest range of the radar, n represents the total number of interference loops in the cross-eye interference system, represents the real part, α i represents the amplitude ratio of the two interference sources in the ith interference loop, j represents the imaginary part, λ represents the wavelength of the radar signal, and f(k i ·d1) represents the difference in distance between the two antenna pairs relative to the radar when the i-th interference loop receives the radar signal and when it transmits the interference signal, θ R k represents the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar. i represents the ratio of the interference baseline length of the ith interference loop to the longest interference baseline length of the cross-eye interference system, g(k i ·d1) represents the difference in angle between the line connecting the two antenna pairs and the signal wavefront when the i-th interference loop receives the radar signal and transmits the interference signal, θ 0.5 Indicates the radar half-power beamwidth.

2. A cross-eye interference baseline length determination system based on a large-size platform, characterized in that: include: An acquisition module is used to acquire the wavelength of a radar signal, the difference in distance between two antenna pairs relative to the radar when each interference loop receives a radar signal and when it transmits an interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of a cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives a radar signal and when it transmits an interference signal, the amplitude ratio of two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives a radar signal sent by the radar, the killing radius of the combat object, the shortest effective range of the radar and the radar half-power beamwidth; the cross-eye interference system includes a plurality of the interference loops, and one interference loop includes two antenna pairs; A first value range determination module is used to determine a first value range of the longest interference baseline length of the cross-eye interference system based on the radar signal wavelength, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and when it transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and when it transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the distance between the radar and any interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, and the killing radius of the combat object; A second value range determination module is used to determine the second value range of the longest interference baseline length of the cross-eye interference system based on the radar signal wavelength, the difference in distance between the two antenna pairs relative to the radar when each interference loop receives the radar signal and transmits the interference signal, the ratio of the interference baseline length of each interference loop to the longest interference baseline length of the cross-eye interference system, the difference in angle between the line connecting the two antenna pairs and the signal wavefront when each interference loop receives the radar signal and transmits the interference signal, the amplitude ratio of the two interference sources in each interference loop, the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar, the shortest effective range of the radar and the radar half-power beamwidth; A cross-eye interference baseline length determination module, used to determine the cross-eye interference baseline length of each interference loop of the cross-eye interference system according to the first value range and the second value range; The first value range determination module specifically includes: The first value range determining unit is used to determine the value range according to the first range formula. Determine the first value range of the longest interference baseline length of the cross-eye jamming system; where r represents the distance between the radar and any jamming loop, θ R It represents the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye jammer receives the radar signal sent by the radar. n represents the total number of jammer loops in the cross-eye jammer system. represents the real part, k i It represents the ratio of the interference baseline length of the ith interference loop to the longest interference baseline length of the cross-eye interference system, α i represents the amplitude ratio of the two interference sources in the ith interference loop, j represents the imaginary part, λ represents the wavelength of the radar signal, and f(k i ·d1) represents the difference in distance between the two antenna pairs relative to the radar when the i-th jamming loop receives the radar signal and when it transmits the jamming signal. d1 represents the longest interference baseline length of the cross-eye jamming system. g(k i d1) represents the difference in angle between the line connecting the two antenna pairs and the signal wavefront when the i-th interference loop receives the radar signal and transmits the interference signal, and R0 represents the killing radius of the combat target; The second value range determination module specifically includes: The second value range determination unit is used to determine the value range of the second range according to the second range formula. Determine the second value range of the longest interference baseline length of the cross-eye interference system; wherein d1 represents the longest interference baseline length of the cross-eye interference system, R L represents the shortest range of the radar, n represents the total number of interference loops in the cross-eye interference system, represents the real part, α i represents the amplitude ratio of the two interference sources in the ith interference loop, j represents the imaginary part, λ represents the wavelength of the radar signal, and f(k i ·d1) represents the difference in distance between the two antenna pairs relative to the radar when the i-th interference loop receives the radar signal and when it transmits the interference signal, θ R k represents the angle between the line connecting any two antenna pairs and the signal wavefront when the cross-eye interference antenna receives the radar signal sent by the radar. i represents the ratio of the interference baseline length of the ith interference loop to the longest interference baseline length of the cross-eye interference system, g(k i ·d1) represents the difference in angle between the line connecting the two antenna pairs and the signal wavefront when the i-th interference loop receives the radar signal and transmits the interference signal, θ 0.5 Indicates the radar half-power beamwidth.

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