An adjustable RCS mechanism for radar targets

Abstract

The invention discloses an adjustable RCS mechanism for a radar target, comprising a driving assembly, a first shell, a second shell and a third shell, wherein the first shell, the second shell and the third shell are all hemispherical arc surface structures; the second shell and the third shell are both sleeved on the first shell, and the second shell and the third shell are both rotationally connected with the first shell, the first shell, the second shell and the third shell are co-centered and enclose a placement cavity; the second shell is provided with a first notch, the third shell is provided with a second notch, and the first notch and the second notch enclose an opening that can communicate with the placement cavity; the driving assembly is respectively transmission-connected with the second shell and the third shell to drive the second shell and the third shell to rotate synchronously in opposite directions. The opening area is adjusted by adjusting the relative positions (rotation angles) of the three hemispherical arc surface structures, and the size of the opening area determines the ability of the target mechanism inside the placement cavity to receive and reflect signals, thereby achieving the purpose of adjusting the RCS of the radar target.

Description

Technical Field

[0001] The invention relates to the technical field of radar targets, in particular to an adjustable RCS mechanism for radar targets. Background Art

[0002] Radar targets are mainly used for range assessment and testing of weapon systems, seekers and other equipment. RCS, also known as radar cross section, is the main indicator parameter of radar targets. It is a physical quantity that characterizes the intensity of echoes generated by the target when irradiated by radar waves; the energy of radar targets and scattering can be expressed as the product of an effective area and the incident power density. This area is usually called the radar cross section. With the upgrading of weapons and equipment, dynamic requirements such as unpredictable signal changes have been put forward for the RCS of radar targets. The ability of RCS in the target to achieve continuous changes meets the dynamic requirements of radar targets.

[0003] Existing radar targets do not have the function of adjusting RCS. For example, the patent application number "201420732346.6" for "a portable and detachable omnidirectional radar target" has the function of realizing the detachable function of the radar target, but cannot adjust the RCS of the radar target. Another example is the patent application number "201910006970.5" for "a radar target design method and device", which is a design idea of ​​a radar target, and also cannot adjust the RCS of the radar target. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned prior art, the present invention provides an adjustable RCS mechanism for a radar target, which adjusts the opening area by adjusting the relative positions (rotation angles) of the three hemispherical arc surface structures. The size of the opening area determines the ability of the target mechanism (such as a triangular reflector and a Luneburg lens, etc.) inside the cavity to receive and reflect signals, thereby achieving the purpose of adjusting the RCS of the radar target.

[0005] To achieve the above object, the present invention provides an adjustable RCS mechanism for a radar target, comprising a drive assembly, a first shell, a second shell and a third shell, wherein the first shell, the second shell and the third shell are all hemispherical arc structures;

[0006] The second shell and the third shell are both sleeved on the first shell, and the second shell and the third shell are both rotatably connected to the first shell, and the first shell, the second shell and the third shell have the same spherical center and surround a placement cavity capable of placing the target mechanism;

[0007] A first notch is provided on a side of the second shell facing the third shell, and a second notch is provided on a side of the third shell facing the second shell, wherein the first notch and the second notch form an opening that can communicate with the placement cavity;

[0008] The driving assembly is respectively connected to the second shell and the third shell in a transmission manner to drive the second shell and the third shell to rotate synchronously in opposite directions, thereby adjusting the area of ​​the opening.

[0009] In one embodiment, it further includes a first connecting shaft and a second connecting shaft;

[0010] A first connecting plate and a second connecting plate are respectively disposed on the upper and lower sides of the upper edge contour of the first shell, a third connecting plate and a fourth connecting plate are respectively disposed on the upper and lower sides of the upper edge contour of the second shell, and a fifth connecting plate and a sixth connecting plate are respectively disposed on the upper and lower sides of the upper edge contour of the third shell;

[0011] The first connecting plate, the third connecting plate, and the fifth connecting plate are sleeved on the first connecting shaft from bottom to top at intervals, wherein the first connecting plate and the fifth connecting plate are both rotatably connected to the first connecting shaft, and the third connecting plate is fixedly connected to the first connecting shaft;

[0012] The second connecting plate, the fourth connecting plate and the sixth connecting plate are sleeved on the second connecting shaft from top to bottom at intervals, wherein the second connecting plate and the fourth connecting plate are both rotatably connected to the second connecting shaft, and the sixth connecting plate is fixedly connected to the second connecting shaft;

[0013] The first connecting shaft and the second connecting shaft are respectively transmission-connected to the driving assembly.

[0014] In one embodiment, the first connecting shaft is coaxially arranged with the second connecting shaft.

[0015] In one embodiment, the driving assembly includes a driving rod, a first transmission rod, a second transmission rod, a third transmission rod and a fourth transmission rod, wherein the first transmission rod and the second transmission rod are coaxially arranged and parallel to the first connecting axis;

[0016] The end of the driving rod is provided with a first sector gear, the two ends of the first transmission rod are respectively provided with a second sector gear and a third sector gear, the two ends of the second transmission rod are respectively provided with a fourth sector gear and a fifth sector gear, the two ends of the third transmission rod are respectively provided with a sixth sector gear and a seventh sector gear, and the two ends of the fourth transmission rod are respectively provided with an eighth sector gear and a ninth sector gear;

[0017] A tenth sector gear is disposed at the top end of the first connecting shaft, and an eleventh sector gear is disposed at the top end of the second connecting shaft;

[0018] The second sector gear and the fourth sector gear are both meshed with the first sector gear, the third sector gear is meshed with the sixth sector gear, the seventh sector gear is meshed with the tenth sector gear, the fifth sector gear is meshed with the eighth sector gear, and the ninth sector gear is meshed with the eleventh sector gear.

[0019] In one embodiment, it further comprises a bracket, wherein the bracket is a C-shaped frame structure, including a base, a vertical beam and a horizontal beam;

[0020] The first transmission rod and the second transmission rod are rotatably connected in the vertical beam, the third transmission rod is rotatably connected in the horizontal beam, and the fourth transmission rod is rotatably connected in the base;

[0021] The vertical beam is provided with a first through hole, and one end of the driving rod having the first sector gear passes through the first through hole and is located in the vertical beam;

[0022] The crossbeam is provided with a second through hole, and one end of the first transmission rod having the tenth sector gear passes through the second through hole and is located in the crossbeam;

[0023] The base is provided with a third through hole, and one end of the second transmission rod having the eleventh sector gear passes through the third through hole and is located in the base.

[0024] In one embodiment, each of the first transmission rod, the second transmission rod, the third transmission rod and the fourth transmission rod is sleeved with at least one bearing.

[0025] In one of the embodiments, a handle is provided on one end of the driving rod outside the vertical beam, and the length direction of the handle is perpendicular to the length direction of the driving rod.

[0026] In one embodiment, connecting seats are provided on both sides of the base.

[0027] Compared with the prior art, the above-mentioned adjustable RCS mechanism for radar target has the following beneficial technical effects:

[0028] 1. The rotation of the ball shell is adjusted by gear meshing transmission. The friction between the gear pairs can achieve a self-locking function to ensure that the ball shells will not slide easily.

[0029] 2. The RCS value can change continuously starting from 0.

[0030] 3. It is small in size, occupies little space, and is easy to install and detect.

[0031] 4. Triangular reflectors, Luneburg lenses and other devices can be installed inside the cavity to form a multifunctional radar target. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0033] Figure 1 It is an axonometric diagram of the overall structure of the adjustable RCS mechanism in an embodiment of the present invention;

[0034] Figure 2 It is an axonometric diagram of the internal structure of the adjustable RCS mechanism in an embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the adjustable RCS mechanism in a state where the opening is completely closed in an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the state of the adjustable RCS mechanism at an opening angle of 30° in an embodiment of the present invention;

[0037] Figure 5 Schematic diagram of the state of the adjustable RCS mechanism at an opening angle of 90° in an embodiment of the present invention;

[0038] Figure 6 Schematic diagram of the state of the adjustable RCS mechanism at an opening angle of 180° in an embodiment of the present invention;

[0039] Figure 7 It is a schematic diagram of a first implementation manner of the connection structure of the first connection shaft in an embodiment of the present invention;

[0040] Figure 8 It is a schematic diagram of a first implementation manner of the connection structure of the second connection shaft in an embodiment of the present invention;

[0041] Fig. 9 It is a schematic diagram of a second implementation manner of the connection structure of the first connection shaft in an embodiment of the present invention;

[0042] Fig.10 It is a schematic diagram of a second implementation manner of the connection structure of the second connecting shaft in an embodiment of the present invention.

[0043] Figure Number:

[0044] A first housing 1, a first connecting plate 101, and a second connecting plate 102;

[0045] The second housing 2, the third connecting plate 201, and the fourth connecting plate 202;

[0046] The third housing 3, the fifth connecting plate 301, and the sixth connecting plate 302;

[0047] The first connecting shaft 4, the first shaft shoulder 401, the first gasket 402, the second gasket 403, the first bearing 404, the second bearing 405, the tenth sector gear 406, and the ninth bearing 407;

[0048] The second connecting shaft 5, the second shaft shoulder 501, the third gasket 502, the fourth gasket 503, the third bearing 504, the fourth bearing 505, the eleventh sector gear 506, and the tenth bearing 507;

[0049] Driving rod 6, first sector gear 601, handle 602;

[0050] A first transmission rod 7, a second sector gear 701, a third sector gear 702, and a fifth bearing 703;

[0051] The second transmission rod 8, the fourth sector gear 801, the fifth sector gear 802, and the sixth bearing 803;

[0052] A third transmission rod 9, a sixth sector gear 901, a seventh sector gear 902, and a seventh bearing 903;

[0053] The fourth transmission rod 10, the eighth sector gear 1001, the ninth sector gear 1002, and the eighth bearing 1003;

[0054] Bracket 11, base 1101, vertical beam 1102, horizontal beam 1103, connecting seat 1104.

[0055] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0056] 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.

[0057] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0058] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0061] like Figure 1-10 The figure shows an adjustable RCS mechanism for a radar target disclosed in this embodiment, which mainly includes a driving assembly, a first shell 1, a second shell 2 and a third shell 3. Among them, the first shell 1, the second shell 2 and the third shell 3 are all hemispherical arc structures, the second shell 2 and the third shell 3 are all sleeved on the first shell 1, and the second shell 2 and the third shell 3 are all connected to the first shell 1 in rotation, and the first shell 1, the second shell 2 and the third shell 3 are co-centered and enclose a placement cavity that can accommodate the target mechanism, such as a triangular reflector and a Luneburg lens. A first notch is provided on the side of the second shell 2 facing the third shell 3, and a second notch is provided on the side of the third shell 3 facing the second shell 2. The first notch and the second notch enclose an opening that can communicate with the placement cavity. The driving assembly is respectively connected to the second shell 2 and the third shell 3 in transmission to drive the second shell 2 and the third shell 3 to rotate synchronously in opposite directions, thereby adjusting the area of ​​the opening. The first notch and the second notch are both V-shaped structures, and the V-shaped depth of the first notch is one-fourth of the maximum circumference of the second shell 2, and the width is one-half of the maximum circumference of the second shell 2. The V-shaped depth of the second notch is one-fourth of the maximum circumference of the third shell 3, and the width is one-half of the maximum circumference of the third shell 3.

[0062] refer to Figure 3-6, are implementations of the second shell 2 and the third shell 3 at different rotation angles, wherein, Figure 3 The opening is completely closed, at which time the RCS of the radar target is the smallest; Figure 4 The opening angle is 30°. Figure 5 When the opening angle is 90°, Figure 6 The opening angle is 180°, at which time the RCS value of the radar target is the largest. Figures 3 to 6 The RCS of the radar target tends to increase gradually. The adjustable RCS mechanism in this embodiment adjusts the opening area by adjusting the relative positions of the three hemispherical arc surface structures (i.e., the rotation angles of the second shell 2 and the third shell 3). The size of the opening area determines the ability of the target mechanism inside the placement cavity to receive and reflect signals, thereby achieving the purpose of adjusting the RCS of the radar target.

[0063] In this embodiment, the adjustable RCS mechanism also includes a first connecting axis 4 and a second connecting axis 5, a first connecting plate 101 and a second connecting plate 102 are respectively provided on the upper and lower sides of the upper edge contour of the first shell 1, a third connecting plate 201 and a fourth connecting plate 202 are respectively provided on the upper and lower sides of the upper edge contour of the second shell 2, and a fifth connecting plate 301 and a sixth connecting plate 302 are respectively provided on the upper and lower sides of the upper edge contour of the third shell 3. The first connecting plate 101, the third connecting plate 201, and the fifth connecting plate 301 are spaced apart from bottom to top on the first connecting shaft 4, the first connecting plate 101 and the fifth connecting plate 301 are both rotatably connected to the first connecting shaft 4, the third connecting plate 201 is fixedly connected to the first connecting shaft 4, wherein the first connecting shaft 4 has a first shoulder 401, which abuts against the bottom of the first connecting plate 101, and the first connecting shaft 4 is also sleeved with a first gasket 402 and a second gasket 403, the first gasket 402 is located between the first connecting plate 101 and the third connecting plate 201, and the second gasket 403 is located between the third connecting plate 201 and the fifth connecting plate 301. The second connecting plate 102, the fourth connecting plate 202, and the sixth connecting plate 302 are spaced apart from top to bottom on the second connecting shaft 5, wherein the second connecting plate 102 and the fourth connecting plate 202 are both rotatably connected to the second connecting shaft 5, and the sixth connecting plate 302 is fixedly connected to the second connecting shaft 5, wherein the second connecting shaft 5 has a second shoulder 501, which abuts against the top of the second connecting plate 102, and the second connecting shaft 5 is also sleeved with a third gasket 502 and a fourth gasket 503, the third gasket 502 is located between the second connecting plate 102 and the fourth connecting plate 202, and the fourth gasket 503 is located between the fourth connecting plate 202 and the sixth connecting plate 302. The first connecting shaft 4 and the second connecting shaft 5 are respectively connected to the driving assembly, that is, the second shell 2 is driven to rotate by driving the first connecting shaft 4, and the third shell 3 is driven to rotate by driving the second connecting shaft 5. When the first connecting shaft 4 and the second connecting shaft 5 are driven to rotate synchronously in opposite directions, the second shell 2 and the third shell 3 can be rotated synchronously in opposite directions, thereby completing the adjustment of the opening area.

[0064] In the specific implementation process, the first connecting shaft 4 and the third connecting plate 201 are interference fit and / or pin fit, the first connecting shaft 4 and the first connecting plate 101, and the first connecting shaft 4 and the fifth connecting plate 301 are clearance fit. The second connecting shaft 5 and the sixth connecting plate 302 are interference fit and / or pin fit, and the second connecting shaft 5 and the second connecting plate 102, and the second connecting shaft 5 and the fourth connecting plate 202 are clearance fit.

[0065] Further preferably, the first connecting shaft 4 is matched with the first connecting plate 101 through the first bearing 404, that is, the outer ring of the first bearing 404 is fixedly connected to the first connecting plate 101, and the inner ring of the first bearing 404 is sleeved on the first connecting shaft 4 and is interference fit and / or pin fit with the first connecting shaft 4. The first connecting shaft 4 is matched with the fifth connecting plate 301 through the second bearing 405, that is, the outer ring of the second bearing 405 is fixedly connected to the fifth connecting plate 301, and the inner ring of the second bearing 405 is sleeved on the first connecting shaft 4 and is interference fit and / or pin fit with the first connecting shaft 4. The second connecting shaft 5 is matched with the second connecting plate 102 through the third bearing 504, that is, the outer ring of the third bearing 504 is fixedly connected to the second connecting plate 102, and the inner ring of the third bearing 504 is sleeved on the second connecting shaft 5 and is interference fit and / or pin fit with the second connecting shaft 5. The second connecting shaft 5 and the fourth connecting plate 202 are matched through the fourth bearing 505, that is, the outer ring of the fourth bearing 505 is fixedly connected to the fourth connecting plate 202, and the inner ring of the fourth bearing 505 is sleeved on the second connecting shaft 5 and is interference fit and / or pin fit with the second connecting shaft 5.

[0066] In this embodiment, the first connecting shaft 4 is coaxially arranged with the second connecting shaft 5, and the driving assembly includes a driving rod 6, a first transmission rod 7, a second transmission rod 8, a third transmission rod 9 and a fourth transmission rod 10, wherein the first transmission rod 7 is coaxially arranged with the second transmission rod 8 and is arranged parallel to and spaced from the first connecting shaft 4 / the second connecting shaft 5, one end of the third transmission rod 9 is adjacent to and perpendicular to the first transmission rod 7, and the other end is adjacent to and perpendicular to the first connecting shaft 4, one end of the fourth transmission rod 10 is adjacent to and perpendicular to the second transmission rod 8, and the other end is adjacent to and perpendicular to the second connecting shaft 5. Specifically, the end of the driving rod 6 is keyed to the first sector gear 601, the two ends of the first transmission rod 7 are keyed to the second sector gear 701 and the third sector gear 702, the two ends of the second transmission rod 8 are keyed to the fourth sector gear 801 and the fifth sector gear 802, the two ends of the third transmission rod 9 are keyed to the sixth sector gear 901 and the seventh sector gear 902, and the two ends of the fourth transmission rod 10 are keyed to the eighth sector gear 1001 and the ninth sector gear 1002. The top end of the first connecting shaft 4 is keyed to the tenth sector gear 406, and the top end of the second connecting shaft 5 is keyed to the eleventh sector gear 506. The second sector gear 701 and the fourth sector gear 801 are both meshed with the first sector gear 601 , the third sector gear 702 is meshed with the sixth sector gear 901 , the seventh sector gear 902 is meshed with the tenth sector gear 406 , the fifth sector gear 802 is meshed with the eighth sector gear 1001 , and the ninth sector gear 1002 is meshed with the eleventh sector gear 506 . That is, when the driving rod 6 rotates, driven by the first sector gear 601, the second sector gear 701 and the fourth sector gear 801 rotate synchronously in the opposite direction, thereby driving the first transmission rod 7 and the second transmission rod 8 to rotate synchronously in the opposite direction, and then, under the meshing action of the third sector gear 702 and the sixth sector gear 901 and the meshing action of the fifth sector gear 802 and the eighth sector gear 1001, the third transmission rod 9 and the fourth transmission rod 10 rotate synchronously in the opposite direction, and then, under the meshing action of the seventh sector gear 902 and the tenth sector gear 406 and the meshing action of the ninth sector gear 1002 and the eleventh sector gear 506, the first connecting shaft 4 and the second connecting shaft 5 rotate synchronously in the opposite direction, finally realizing the synchronous counter-rotation of the second shell 2 and the third shell 3, and completing the adjustment of the opening area.

[0067] It should be noted that since the first connecting shaft 4 and the second connecting shaft 5 are both rotated by gear transmission, and since there is only one total drive, namely the drive rod 6 and the first sector gear 601, the first connecting shaft 4 and the second connecting shaft 5 will not rotate in the same direction. Therefore, when the first shell 1, the second shell 2, the third shell 3 and the drive assembly are assembled and the first connecting shaft 4 and the second connecting shaft 5 rotate, the first shell 1 will be subjected to two friction forces in opposite directions and of substantially the same magnitude, thereby fixing the first shell 1 and preventing it from rotating. In the specific implementation process, when adjusting the opening area, the first shell 1 can also be manually fixed by hand, thereby ensuring the reliability of the RCS mechanism adjustment.

[0068] The adjustable RCS mechanism in this embodiment also includes a bracket 11, which is a C-shaped frame structure, specifically composed of a base 1101, a vertical beam 1102 and a horizontal beam 1103, wherein the base 1101, the vertical beam 1102 and the horizontal beam 1103 are sequentially connected to form a C-shaped structure, and the combined structure composed of the first shell 1, the second shell 2 and the third shell 3 is located on the C-shaped opening of the C-shaped structure. Specifically, the first transmission rod 7 and the second transmission rod 8 are rotatably connected in the vertical beam 1102, the third transmission rod 9 is rotatably connected in the horizontal beam 1103, and the fourth transmission rod 10 is rotatably connected in the base 1101. Further specifically, a first through hole is provided on the vertical beam 1102, and one end of the driving rod 6 with the first sector gear 601 passes through the first through hole and is located in the vertical beam 1102. A second through hole is provided on the horizontal beam 1103, and one end of the first transmission rod 7 with the tenth sector gear 406 passes through the second through hole and is located in the horizontal beam 1103. The base 1101 is provided with a third through hole, and one end of the second transmission rod 8 having the eleventh sector gear 506 passes through the third through hole and is located inside the base 1101 .

[0069] In the specific implementation process, the first transmission rod 7, the second transmission rod 8, the third transmission rod 9, the fourth transmission rod 10, the first connecting shaft 4 and the second connecting shaft 5 are all sleeved with at least one bearing. Specifically, the first transmission rod 7 has two fifth bearings 703, which are respectively located near the second sector gear 701 and the third sector gear 702. The second transmission rod 8 has two sixth bearings 803, which are respectively located near the fourth sector gear 801 and the fifth sector gear 802. The third transmission rod 9 has two seventh bearings 903, which are respectively located near the sixth sector gear 901 and the seventh sector gear 902. The fourth transmission rod 10 has two eighth bearings 1003, which are respectively located near the eighth sector gear 1001 and the ninth sector gear 1002. The first connecting shaft 4 has a ninth bearing 407, which is located near the tenth sector gear 406. The second connecting shaft 5 has a tenth bearing 507, which is located near the eleventh sector gear 506.

[0070] In this embodiment, a handle 602 is provided on one end of the driving rod 6 outside the vertical beam 1102. The length direction of the handle 602 is perpendicular to the length direction of the driving rod 6, which is convenient for the staff to control the rotation of the driving rod 6 and thus complete the adjustment of the opening area.

[0071] In this embodiment, connecting seats 1104 are provided on both sides of the base 1101. The connecting seats 1104 are angle steel structures. There are four of them and they are symmetrically distributed on both sides of the base 1101 in a rectangular structure for fixing the adjustable RCS mechanism at a desired position.

[0072] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An adjustable RCS mechanism for a radar target, characterized in that: It includes a driving assembly, a first shell, a second shell and a third shell, wherein the first shell, the second shell and the third shell are all hemispherical arc surface structures; The second shell and the third shell are both sleeved on the first shell, and the second shell and the third shell are both rotatably connected to the first shell, and the first shell, the second shell and the third shell have the same spherical center and surround a placement cavity capable of placing the target mechanism; A first notch is provided on a side of the second shell facing the third shell, and a second notch is provided on a side of the third shell facing the second shell, wherein the first notch and the second notch form an opening that can communicate with the placement cavity; The driving assembly is respectively connected to the second shell and the third shell in a transmission manner to drive the second shell and the third shell to rotate synchronously in opposite directions, thereby adjusting the area of ​​the opening.

2. The adjustable RCS mechanism for radar target according to claim 1, characterized in that: Also includes a first connecting shaft and a second connecting shaft; A first connecting plate and a second connecting plate are respectively disposed on the upper and lower sides of the upper edge contour of the first shell, a third connecting plate and a fourth connecting plate are respectively disposed on the upper and lower sides of the upper edge contour of the second shell, and a fifth connecting plate and a sixth connecting plate are respectively disposed on the upper and lower sides of the upper edge contour of the third shell; The first connecting plate, the third connecting plate, and the fifth connecting plate are sleeved on the first connecting shaft from bottom to top at intervals, wherein the first connecting plate and the fifth connecting plate are both rotatably connected to the first connecting shaft, and the third connecting plate is fixedly connected to the first connecting shaft; The second connecting plate, the fourth connecting plate and the sixth connecting plate are sleeved on the second connecting shaft from top to bottom at intervals, wherein the second connecting plate and the fourth connecting plate are both rotatably connected to the second connecting shaft, and the sixth connecting plate is fixedly connected to the second connecting shaft; The first connecting shaft and the second connecting shaft are respectively transmission-connected to the driving assembly.

3. The adjustable RCS mechanism for radar target according to claim 2, characterized in that: The first connecting shaft is coaxially arranged with the second connecting shaft.

4. The adjustable RCS mechanism for radar target according to claim 3, characterized in that: The driving assembly comprises a driving rod, a first transmission rod, a second transmission rod, a third transmission rod and a fourth transmission rod, wherein the first transmission rod and the second transmission rod are coaxially arranged and parallel to the first connecting axis; The end of the driving rod is provided with a first sector gear, the two ends of the first transmission rod are respectively provided with a second sector gear and a third sector gear, the two ends of the second transmission rod are respectively provided with a fourth sector gear and a fifth sector gear, the two ends of the third transmission rod are respectively provided with a sixth sector gear and a seventh sector gear, and the two ends of the fourth transmission rod are respectively provided with an eighth sector gear and a ninth sector gear; A tenth sector gear is disposed at the top end of the first connecting shaft, and an eleventh sector gear is disposed at the top end of the second connecting shaft; The second sector gear and the fourth sector gear are both meshed with the first sector gear, the third sector gear is meshed with the sixth sector gear, the seventh sector gear is meshed with the tenth sector gear, the fifth sector gear is meshed with the eighth sector gear, and the ninth sector gear is meshed with the eleventh sector gear.

5. The adjustable RCS mechanism for radar target according to claim 4, characterized in that: It also includes a bracket, which is a C-shaped frame structure, including a base, vertical beams and horizontal beams; The first transmission rod and the second transmission rod are rotatably connected in the vertical beam, the third transmission rod is rotatably connected in the horizontal beam, and the fourth transmission rod is rotatably connected in the base; The vertical beam is provided with a first through hole, and one end of the driving rod having the first sector gear passes through the first through hole and is located in the vertical beam; The crossbeam is provided with a second through hole, and one end of the first transmission rod having the tenth sector gear passes through the second through hole and is located in the crossbeam; The base is provided with a third through hole, and one end of the second transmission rod having the eleventh sector gear passes through the third through hole and is located in the base.

6. The adjustable RCS mechanism for radar target according to claim 5, characterized in that: The first transmission rod, the second transmission rod, the third transmission rod and the fourth transmission rod are all sleeved with at least one bearing.

7. The adjustable RCS mechanism for radar target according to claim 5, characterized in that: A handle is provided on one end of the driving rod outside the vertical beam, and the length direction of the handle is perpendicular to the length direction of the driving rod.

8. The adjustable RCS mechanism for radar target according to claim 5, characterized in that: Connecting seats are arranged on both sides of the base.

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