An active array radar with modular antenna array elements

Abstract

This application provides an active array radar with modular antenna array elements, including a support assembly and an antenna assembly. The support assembly includes a base and a support member mounted on the base, the support member being rotatably connected to the base; the antenna assembly includes a first antenna module and a second antenna module, the first antenna module being located at the end of the support member away from the base, and the second antenna module being located on the support member and below the first antenna in the vertical direction; the second antenna module includes a first scanning module and a second scanning module disposed opposite to the first scanning module, the ends of the first and second scanning modules away from the support member respectively having a first scanning surface and a second scanning surface, both the first and second scanning surfaces being arranged in a mesh pattern. The array radar provided above reduces the equivalent windward area and the probability of water film formation through the mesh scanning surface, significantly reducing wind load and icing burden, and minimizing aperture deformation in strong wind, rain / salt spray environments.

Description

Technical Field

[0001] This application relates to the field of radar technology, and more particularly to an active array radar with modular antenna array units. Background Technology

[0002] With increasing demands for integrated air / sea surveillance, detection of low-end, small, and slow-moving targets, and all-weather operation, radars are widely adopting active phased array systems, dividing the array surface into rapidly replaceable modular array units to improve reliability and operational efficiency. The system is typically integrated with subsystems such as identification and interrogation, and data links, requiring stable gain under conditions of strong winds, rain and icing, salt spray, and long-term vibration.

[0003] Existing active arrays mostly use a dense, solid surface as the radiation / protection structure, such as a solid metal panel or a metal panel + honeycomb / foam sandwich composite panel, with heat pipes / liquid cooling / air cooling on the back for heat dissipation; modular arrays are usually assembled from several rectangular panels and the seams are treated with screws, adhesives and sealing rings.

[0004] However, the dense aperture exhibits significant windward area and liquid film formation under strong winds and icing conditions, resulting in high aerodynamic loads and rotational inertia, easy surface deformation, phase instability, increased sidelobes, and impaired detection of weak targets. Even with a honeycomb sandwich design, the weight and inertia remain high, limiting scanning maneuverability and increasing foundation and drive costs. Therefore, an active array radar with modular antenna array units is needed to reduce wind resistance and improve overall stability. Utility Model Content

[0005] In view of this, it is necessary to provide an active array radar with modular antenna array units to solve the above problems.

[0006] Embodiments of this application provide an active array radar with modular antenna array elements, comprising:

[0007] A support assembly includes a base and a support member disposed on the base, the support member being rotatably connected to the base;

[0008] The antenna unit includes a first antenna module and a second antenna module. The first antenna module is disposed at the end of the carrier that is away from the base, and the second antenna module is disposed on the carrier and located below the first antenna in the vertical direction.

[0009] The second antenna module includes a first scanning module and a second scanning module disposed opposite to the first scanning module. The ends of the first scanning module and the second scanning module away from the carrier respectively have a first scanning surface and a second scanning surface, and both the first scanning surface and the second scanning surface are arranged in a mesh pattern.

[0010] In at least one embodiment of this application, the first scanning module includes a fixing member and a scanning member disposed on the fixing member. The end of the fixing member away from the scanning member is disposed on the support member and is capable of rotating in the vertical direction.

[0011] In at least one embodiment of this application, the fastener includes a first fixing part and a second fixing part disposed opposite to the first fixing part, the first fixing part having a first rotation axis and the second fixing part having a second rotation axis;

[0012] When viewed horizontally, the projections of the first rotation axis and the second rotation axis are offset.

[0013] In at least one embodiment of this application, the angle between the line connecting the first rotation axis and the second rotation axis and the horizontal line is denoted as a, which satisfies 10°≤a≤50°.

[0014] In at least one embodiment of this application, the included angle α = 30°.

[0015] In at least one embodiment of this application, the first scanning module further includes a fixing frame, wherein opposite sides of the fixing frame are fixedly connected to the fixing member and the scanning member, respectively, to prevent the scanning member from shaking.

[0016] In at least one embodiment of this application, the first scanning module further includes a reinforcing member, and the first scanning module further includes a plurality of reinforcing members, which are disposed on the fixing frame for reinforcing the fixing frame.

[0017] In at least one embodiment of this application, the carrier includes a main body and protrusions circumferentially disposed on the main body, the protrusions being located on the side of the main body near the base, and the protrusions being arranged in an array along the axial direction of the main body.

[0018] In at least one embodiment of this application, the geometric center of the first scanning module and the geometric center of the second scanning module are staggered in the vertical direction.

[0019] In at least one embodiment of this application, the base includes a cylindrical body and a plurality of gripping portions disposed on the cylindrical body, the plurality of gripping portions being arranged around the circumference of the cylindrical body.

[0020] The aforementioned active array radar with modular antenna array units reduces the equivalent windward area and the probability of water accumulation film through a mesh scanning surface, significantly reducing wind load and icing burden, and minimizing aperture deformation in strong wind, rain / salt spray environments. Opposite scanning modules ensure symmetrical mass and aerodynamic distribution, improving dynamic balance, reducing wind-induced vibration and bearing side loads, and resulting in better rotational stability under high wind / start-stop conditions. The two layered antenna modules reduce mutual obstruction and near-field coupling, improving effective aperture utilization, and reducing beam distortion and sidelobe undulation; complementary lines of sight at different heights provide more uniform coverage. Attached Figure Description

[0021] Figure 1 This is a perspective view of an active array radar with modular antenna array units according to an embodiment of this application.

[0022] Figure 2 for Figure 1 A front view exploded view of an active array radar with modular antenna array units.

[0023] Figure 3 for Figure 1 An exploded three-dimensional view of an active array radar with modular antenna array units.

[0024] Figure 4 for Figure 1 A top view of an active array radar with modular antenna array units.

[0025] Explanation of main component symbols

[0026] 100. An active array radar with modular antenna array units; 10. Support component; 11. Base; 111. Cylinder; 112. Grip part; 12. Supporting element; 121. Main body; 122. Protrusion; 20. Antenna unit; 21. First antenna module; 22. Second antenna module; 221. First scanning module; 221a. First scanning surface; 2211. Fixing element; 2212. Scanning element; 2212a. First fixing part; 2212b. Second fixing part; 2213. Fixing frame; 2214. Reinforcing element; 222. Second scanning module; 222a. Second scanning surface. Detailed Implementation

[0027] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0028] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0029] Embodiments of this application provide an active array radar with modular antenna array units, including a carrier component and an antenna component.

[0030] The support assembly includes a base and a support member disposed on the base, wherein the support member is rotatably connected to the base;

[0031] The antenna unit includes a first antenna module and a second antenna module. The first antenna module is disposed at the end of the carrier that is away from the base, and the second antenna module is disposed on the carrier and located below the first antenna in the vertical direction.

[0032] The second antenna module includes a first scanning module and a second scanning module disposed opposite to the first scanning module. The ends of the first scanning module and the second scanning module away from the carrier respectively have a first scanning surface and a second scanning surface, and both the first scanning surface and the second scanning surface are arranged in a mesh pattern.

[0033] The aforementioned active array radar with modular antenna array units reduces the equivalent windward area and the probability of water accumulation film through a mesh scanning surface, significantly reducing wind load and icing burden, and minimizing aperture deformation in strong wind, rain / salt spray environments. Opposite scanning modules ensure symmetrical mass and aerodynamic distribution, improving dynamic balance, reducing wind-induced vibration and bearing side loads, and resulting in better rotational stability under high wind / start-stop conditions. The two layered antenna modules reduce mutual obstruction and near-field coupling, improving effective aperture utilization, and reducing beam distortion and sidelobe undulation; complementary lines of sight at different heights provide more uniform coverage.

[0034] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] Please see Figures 1-4 The embodiments of this application provide an active array radar 100 with modular antenna array units, including a carrier component 10 and an antenna component.

[0036] The support assembly 10 includes a base 11 and a support member 12 disposed on the base 11, the support member 12 being rotatably connected to the base 11; the antenna unit 20 includes a first antenna module 21 and a second antenna module 22, the first antenna module 21 being disposed at the end of the support member 12 away from the base 11, and the second antenna module 22 being disposed on the support member 12 and located vertically below the first antenna;

[0037] The second antenna module 22 includes a first scanning module 221 and a second scanning module 222 disposed opposite to the first scanning module 221. The ends of the first scanning module 221 and the second scanning module 222 away from the carrier 12 have a first scanning surface 221a and a second scanning surface 222a, respectively. Both the first scanning surface 221a and the second scanning surface 222a are arranged in a mesh pattern.

[0038] Specifically, in this embodiment, it should be noted that the active array radar includes a support assembly 10 and an antenna assembly. The support assembly 10 includes a base 11 and a support member 12 disposed on the base 11. The support member 12 and the base 11 are rotatably connected to achieve azimuth scanning movement. The antenna assembly includes a first antenna module 21 and a second antenna module 22. The first antenna module 21 is disposed at the end of the support member 12 away from the base 11; the second antenna module 22 is disposed in the middle of the support member 12 and is located below the first antenna module 21 in the vertical direction. The second antenna module 22 is specifically composed of a first scanning module 221 and a second scanning module 222 disposed opposite to it. Both the first scanning module 221 and the second scanning module 222 form their respective radiation / scanning apertures facing away from the support member 12, namely a first scanning surface 221a and a second scanning surface 222a, respectively; both the first scanning surface 221a and the second scanning surface 222a adopt a mesh structure.

[0039] Furthermore, in this embodiment, the first scanning module 221 and the second scanning module 222 are arranged opposite each other in the plane of the carrier 12 (e.g., approximately 180° opposite each other about the central axis of the carrier 12) so that the two scanning surfaces form a symmetrical aerodynamic and mass distribution when rotating in azimuth. Preferably, the mesh porosity of the first scanning surface 221a and the second scanning surface 222a is within the allowable range of engineering (e.g., in the range of 30% to 55%), and the mesh pitch is matched with the working wavelength (e.g., the pitch p is not greater than 0.2λ) to reduce the equivalent windward area and the probability of rainwater film formation while ensuring high reflection efficiency in the working frequency band. The first antenna module 21, as an independent array arranged in layers above and below the second antenna module 22, has no specific structural form. The radiation form that coordinates with the second antenna module 22 can be selected according to the mission requirements, and the overall integrated rotation and installation positioning can be achieved through the carrier 12.

[0040] Preferably, the first and second scanning surfaces 222a of the second antenna module 22 both adopt a mesh structure, which significantly reduces the equivalent windward area while maintaining the reflection efficiency of the working frequency band. This reduces the formation of continuous water film and ice on the scanning surface due to rain and snow, thereby reducing aerodynamic load and phase drift caused by surface deformation in environments such as strong wind, rain and ice, and salt spray. This keeps the array gain and sidelobes stable, which is beneficial for the reliable detection of weak targets.

[0041] Furthermore, the relative (opposite) arrangement of the first scanning module 221 and the second scanning module 222 makes the mass and aerodynamic distribution of the second antenna module 22 more symmetrical during azimuth rotation, which helps to reduce lateral loads on the bearings and wind-induced vibrations, and improves the stability and reliability of azimuth rotation. Moreover, the layered layout with the first antenna module 21 above and the second antenna module 22 below helps to reduce geometric obstruction and near-field interactions between them, improves effective aperture utilization and coverage uniformity, and maintains the stability of the overall structure under complex aerodynamic conditions.

[0042] In one specific embodiment, the first scanning module 221 includes a fixing member 2211 and a scanning member 2212 disposed on the fixing member 2211. One end of the fixing member 2211 away from the scanning member 2212 is disposed on the support member 12 and can rotate in the vertical direction.

[0043] Specifically, in this embodiment, it should be noted that the first scanning module 221 includes a fixing member 2211 and a scanning member 2212 disposed on the fixing member 2211. The fixing member 2211 is structured to detachably connect the scanning member 2212 to the carrier member 12, with one end away from the scanning member 2212 fixed to the carrier member 12; an axial connection portion for rotational engagement is provided between the fixing member 2211 and the carrier member 12, allowing the first scanning module 221 to rotate in the vertical direction. Preferably, using the fixing member 2211 to allow the first scanning module 221 to rotate in the vertical direction relative to the carrier member 12 facilitates assembly calibration and in-situ fine-tuning of the orientation of the scanning member 2212 without changing the overall structure of the carrier member 12, which helps to ensure the posture accuracy of the scanning surface.

[0044] In one specific embodiment, the fastener 2211 includes a first fastening part 2212a and a second fastening part 2212b disposed opposite to the first fastening part 2212a. The first fastening part 2212a has a first rotation axis, and the second fastening part 2212b has a second rotation axis.

[0045] When viewed horizontally, the projections of the first rotation axis and the second rotation axis are offset.

[0046] Specifically, in this embodiment, it should be noted that the fixing member 2211 adopts a two-section structure with opposing parts, specifically including a first fixing part 2212a and a second fixing part 2212b disposed opposite to it. A first rotating shaft is disposed within the first fixing part 2212a, and a second rotating shaft is disposed within the second fixing part 2212b. Both are used to form a rotational engagement with the carrier member 12 or to provide a rotation / support interface for the scanning member 2212. The first fixing part 2212a and the second fixing part 2212b are respectively arranged on opposite sides of the scanning member 2212, forming a clamping installation and positioning of the scanning member 2212.

[0047] Furthermore, the two rotating axes are at different heights in the vertical direction (forming a height difference Δh relative to the reference plane of the support member 12) and are staggered in the horizontal direction. Therefore, when the first scanning module 221 rotates relative to the support member 12 in the vertical direction, the scanning member 2212 does not rotate purely around a "straight axis" that is completely coplanar with its opening surface. Instead, it is constrained by the different elevations of the two support points and the non-collinear supports, forming a slight conical composite rotation: that is, while rotating in azimuth, the posture of the scanning member 2212 produces periodic small fluctuations in the pitch / roll direction (passive pitch / roll micro-oscillation), the amplitude of which is determined by the height difference Δh and geometric parameters such as the horizontal misalignment of the two axes and the included angle α.

[0048] Furthermore, by utilizing the conical composite motion resulting from the different heights of the two rotating axes, the scanning component 2212 achieves small pitch / roll undulations in each azimuth rotation. This eliminates the need for an independent pitch actuator, enabling the acquisition of multi-angle micro-view data. This helps reduce the impact of low-grazing-angle multipath propagation and improves the stable detection probability of small targets. The non-collinear dual supports at different elevations form a spatial triangulation constraint, which, compared to a single collinear support at the same height, provides higher torsional stiffness and lateral load-bearing capacity, reducing aperture sway and pointing jitter under strong wind / start-stop conditions.

[0049] In one specific embodiment, the angle between the line connecting the first rotation axis and the second rotation axis and the horizontal line is denoted as 'a', which satisfies 10°≤a≤50°.

[0050] Specifically, the fixing member 2211 is provided with a first rotating shaft and a second rotating shaft, which are arranged non-collinearly in space. The line connecting the first rotating shaft and the second rotating shaft forms an angle α with respect to the horizontal line, and α satisfies 10°≤a≤50°. Here, α is used to characterize the comprehensive geometric relationship between the vertical elevation difference and the horizontal misalignment of the two supporting shafts: when α increases, the upward tilt of the connecting line between the shafts increases, reflecting an increase in the relative height difference (or equivalent height difference) and misalignment ratio of the two shafts; when α decreases, the connecting line between the shafts approaches the horizontal, reflecting that the heights of the two shafts are closer or the misalignment ratio decreases.

[0051] Furthermore, limiting 'a' to 10°–50° keeps the pitch / roll micro-oscillations resulting from azimuth rotation superposition within a small, calibrable range, thus obtaining favorable multi-angle micro-view data. The non-collinear dual-axis supports with a certain upward angle form a spatial triangulation constraint. Compared to cases where 'a' is too small (nearly horizontal) or too large (excessively tilted), the 10°–50° range significantly improves torsional stiffness and lateral load-bearing capacity, resulting in greater stability under strong winds and start-stop impacts. By setting the range of 'a', space can be reserved in the structure for wiring, reinforcing ribs, and flow guide components, reducing mechanical interference and stress concentration caused by excessively close axes.

[0052] Preferably, the included angle α = 30°

[0053] In one specific embodiment, the first scanning module 221 further includes a fixing frame 2213, the opposite sides of which are fixedly connected to the fixing member 2211 and the scanning member 2212 respectively, to prevent the scanning member 2212 from shaking.

[0054] Specifically, in this embodiment, it should be noted that the first scanning module 221 further includes a fixing frame 2213, which is a load-bearing component bridging the scanning element 2212 and the fixing element 2211. The fixing frame 2213 has a first connecting end and a second connecting end on opposite sides. The first connecting end is fixedly connected to the mounting position of the fixing element 2211 via a screw / positioning pin, and the second connecting end is fixedly connected to the back bearing beam of the scanning element 2212 via a screw / pressure plate or dovetail slider, thereby forming a rigid closed force path of fixing element 2211—fixing frame 2213—scanning element 2212. To improve bending and torsional resistance, the fixing frame 2213 is preferably frame-shaped or portal-shaped with reinforcing ribs / folded edges on its web, and a close-fitting support surface is arranged on the side connected to the scanning element 2212 to increase the load-bearing area and reduce the unit compressive stress.

[0055] Preferably, a pre-tightening component (such as a spring washer / nylon lock nut) or an anti-loosening structure (such as a locking washer or thread-locking adhesive) is provided between the fixing bracket 2213 and the connection interfaces at both ends to prevent loosening under long-term vibration; thin elastic gaskets or wear-resistant gaskets can be added to the contact surface for micro-adhesion compensation and vibration damping. The fixing bracket 2213 can be made of high-strength aluminum alloy or stainless steel, with an anodized / anti-corrosion coating treatment on the surface.

[0056] In one specific embodiment, the first scanning module further includes a plurality of reinforcing members 2214, which are inserted through the fixing frame 2213 to reinforce the fixing frame 2213.

[0057] Specifically, in this embodiment, it should be noted that the first scanning module 221 further includes multiple reinforcing members 2214, which are inserted through the fixing frame 2213 for cross-surface reinforcement and through-locking of the fixing frame 2213. Specifically, the fixing frame 2213 is a frame-shaped or portal-shaped load-bearing member, and its web and side beams are pre-fabricated with through holes / oblong holes that match the reinforcing members 2214; the reinforcing members 2214 are preferably pin-type or screw-type through-member members, arranged in two rows or staggered in a quincunx pattern, penetrating the stress area of ​​the fixing frame 2213, so that the left and right side beams and web of the fixing frame 2213 form a tension-compression closed loop.

[0058] Furthermore, the through-type stiffener 2214 locks the left and right side beams of the fixed frame 2213 to the web in three directions, forming a closed force channel. Compared with schemes that rely solely on plate thickness or local ribs, the deflection and torsion angle of the fixed frame 2213 under wind load and start-stop inertial loads are significantly reduced. The stiffener 2214 provides point-to-line support at the weak web of the fixed frame 2213, effectively shortening the free slenderness ratio of the web, delaying local buckling, and improving the ultimate bearing capacity.

[0059] In one specific embodiment, the carrier 12 includes a main body 121 and protrusions 122 circumferentially disposed on the main body 121. The protrusions 122 are located on the side of the main body 121 close to the base 11, and the protrusions 122 are arranged in an array along the axial direction of the main body 121.

[0060] Specifically, in this embodiment, it should be noted that the support member 12 includes a main body 121 and protrusions 122 arranged around the main body 121. The protrusions 122 are arranged on the side of the main body 121 near the base 11 and are arranged in an array at intervals along the axial direction of the main body 121, preferably a plurality of concentric annular protrusions (or a multi-segment splicing ring that is approximately annular). The outer surface of each protrusion 122 transitions to the main body 121 of the support member 12 with a rounded corner or a small taper to reduce stress concentration; the inner surface may form an annular groove for assembly or wiring. For ease of manufacturing and assembly, the protrusions 122 may be integrally formed with the main body 121 (such as integral spinning / machining), or fixed to the main body 121 circumferentially by ring welding / screwing.

[0061] Furthermore, the annular protrusions along the axial array are equivalent to arranging multiple circumferential reinforcing ribs on the main body 121 of the support component 12, enabling the support component 12 to obtain higher circumferential and torsional stiffness in the high-load area near the base 11, effectively suppressing deformation and swaying under strong wind and start-stop conditions. The multiple protrusions progressively transfer and disperse the loads from the antenna module and rotation drive in the axial direction, reducing the peak stress on a single cross section and improving the fatigue life at the connection with the base 11. The annular space formed inside the protrusion 122 can serve as a soft bending and fixing channel for the wire harness / waveguide, giving the external wiring a reasonable bending radius and fixing point, reducing stress and wear caused by long-term rotation and vibration.

[0062] In one specific embodiment, the geometric center of the first scanning module 221 and the geometric center of the second scanning module 222 are staggered in the vertical direction.

[0063] Specifically, the geometric centers of the first scanning module 221 and the second scanning module 222 are staggered vertically, meaning they have a preset height difference H in the height direction of the support member 12. This staggered arrangement reduces the overlap of the projections of the two scanning surfaces in the main lobe direction, minimizing the obstruction of opposing beams by the frame and backrest, and improving effective aperture utilization and coverage uniformity. The non-coplanar arrangement widens the coupling path, alters the relative incident / radiation angle, and increases isolation, helping to reduce stray coupling and front-end compression risks, thereby maintaining gain and sidelobe stability.

[0064] In one specific embodiment, the base 11 includes a cylindrical body 111 and a plurality of gripping portions 112 disposed on the cylindrical body 111, the plurality of gripping portions 112 being arranged around the periphery of the cylindrical body 111.

[0065] Specifically, in this embodiment, it should be noted that: a plurality of n-shaped gripping rods are provided on the outer periphery of the cylindrical body 111 of the base 11, with each gripping rod arranged circumferentially around the cylindrical body 111 and spaced apart from each other. The n-shaped gripping rod is a closed-open component formed by integral bending, with its two ends fixedly connected to the cylindrical body 111 by mounting seats / saddle-shaped bases, and the middle part is an arched or straight beam section, with an overall appearance resembling the letter "n". To adapt to working conditions such as wearing gloves, wet conditions, or low-temperature icing, the outer surface of the gripping rod is provided with a fine anti-slip knurled / sandblasted texture.

[0066] Furthermore, the n-shaped gripper 112 provides a three-dimensional gripping space that can be held through the palm or hooked with the finger. Compared to the bumpy protrusions on the surface, it has a higher degree of freedom in the direction of force, enabling multi-posture operations such as pulling, pushing, lifting, and twisting during assembly, hoisting, and maintenance, significantly reducing the risk of slippage. The evenly distributed / staggered arrangement allows the operator to grip from any position; the anti-slip texture and finger gaps g ensure stable force application even when wearing gloves, reducing the time for secondary repositioning and misoperation; the securing holes facilitate the temporary fixing of cables and safety ropes, reducing the risk of entanglement and falls.

[0067] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. An active array radar with modular antenna array units, characterized by, include: A support assembly includes a base and a support member disposed on the base, the support member being rotatably connected to the base; The antenna unit includes a first antenna module and a second antenna module. The first antenna module is disposed at the end of the carrier that is away from the base, and the second antenna module is disposed on the carrier and located below the first antenna in the vertical direction. The second antenna module includes a first scanning module and a second scanning module disposed opposite to the first scanning module. The ends of the first scanning module and the second scanning module away from the carrier have a first scanning surface and a second scanning surface, respectively. Both the first scanning surface and the second scanning surface are arranged in a mesh pattern.

2. An active array radar with modular antenna array units according to claim 1, characterized in that, The first scanning module includes a fixing member and a scanning member disposed on the fixing member. The end of the fixing member away from the scanning member is disposed on the support member and can rotate in the vertical direction.

3. An active array radar with modular antenna array units according to claim 2, characterized in that, The fastener includes a first fixing part and a second fixing part disposed opposite to the first fixing part. The first fixing part has a first rotation axis and the second fixing part has a second rotation axis. When viewed horizontally, the projections of the first rotation axis and the second rotation axis are offset.

4. An active array radar with modular antenna array units according to claim 3, characterized in that, The angle between the line connecting the first rotation axis and the second rotation axis and the horizontal line is denoted as a, which satisfies 10°≤a≤50°.

5. An active array radar with modular antenna array units according to claim 4, characterized in that, The included angle α = 30°.

6. An active array radar with modular antenna array units according to claim 2, characterized in that, The first scanning module also includes a fixing frame, with its opposite sides fixedly connected to the fixing member and the scanning member, respectively, to prevent the scanning member from shaking.

7. An active array radar with modular antenna array units according to claim 6, characterized in that, The first scanning module also includes multiple reinforcing members, which are inserted through the fixing frame to reinforce the fixing frame.

8. An active array radar with modular antenna array units according to claim 1, characterized in that, The support member includes a main body and protrusions circumferentially disposed on the main body. The protrusions are located on the side of the main body near the base and are arranged in an array along the axial direction of the main body.

9. An active array radar with modular antenna array units according to claim 1, characterized in that, The geometric centers of the first scanning module and the second scanning module are staggered in the vertical direction.

10. An active array radar with modular antenna array units according to claim 1, characterized in that, The base includes a cylindrical body and a plurality of gripping parts disposed on the cylindrical body, the plurality of gripping parts being arranged around the circumference of the cylindrical body.

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