Compact airborne detection and distance measurement composite system

Abstract

The invention relates to the technical field of air-based platform target detection and distance measurement target identification, in particular to a compact airborne detection and distance measurement composite system which comprises an optical antenna subsystem, an infrared detection subsystem, a laser distance measurement subsystem and a simple swing mirror which are installed on the top face of a rotary table tracking subsystem. One part of the ranging laser emission subsystem is mounted in the rotary table tracking sub-device, and the rest part of the ranging laser emission subsystem is mounted on the top surface of the rotary table tracking sub-device; the range finding laser emission subsystem and the single swing mirror are connected to form a range finding laser emission light path, the single swing mirror and the optical antenna subsystem are connected through a light path to form a receiving beam combination light path, and the receiving beam combination light path serves as an infrared detection front-end light path and also serves as a range finding receiving front-end light path; one side, close to the single swing mirror, of the secondary mirror is connected with an infrared detection subsystem light path to form an infrared detection rear-end light path; the side, away from the single swing mirror, of the secondary mirror is connected with a laser ranging subsystem light path to form a ranging receiving rear-end light path. The device is simple in structure and high in compactness by improving the light path design.

Description

Technical Field

[0001] This invention relates to the field of airborne platform target detection and ranging target identification technology, specifically to a compact airborne detection and ranging composite system. Background Technology

[0002] With the development of optical application technology, the demand for integrated laser detection and ranging equipment is increasing. However, existing airborne laser detection and ranging composite systems are mostly designed for a high degree of integration of detection and ranging, or simply achieve a compact structure by sharing a portion of the optical path for transmission and reception. This makes it difficult to meet the growing demand for compactness as technology advances. Furthermore, existing systems capable of detecting and ranging long-distance targets are all ground-based devices; there is a lack of information on how to implement such technologies on an airborne basis. Based on this, those skilled in the art urgently need to provide a novel compact design scheme and a long-distance target detection and ranging solution for application in airborne laser detection and ranging composite systems, in order to overcome the technical problems existing in the above-mentioned prior art. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects existing in the prior art, thereby providing an airborne compact detection and ranging composite system. By optimizing the arrangement of the optical path and the overall structural design, the space occupied by the overall system is reduced, and it can better adapt to the requirements of the airborne environment. A compact airborne detection and ranging composite system includes: an optical antenna subsystem, an infrared detection subsystem, a laser ranging subsystem, and a single pendulum mirror mounted on the top surface of a turntable tracking subsystem; and a ranging laser emission subsystem, partly installed inside the turntable tracking subsystem and the remainder mounted on the top surface of the turntable tracking subsystem. The ranging laser emission subsystem and the single pendulum mirror are connected in sequence to form the ranging laser emission optical path: The infrared detection optical path consists of an infrared detection front-end optical path and an infrared detection rear-end optical path connected together. The ranging receiver optical path consists of the ranging receiver front-end optical path and the ranging receiver back-end optical path; The single pendulum mirror and the optical antenna subsystem are connected to form a receiving beam combining optical path, which serves as both the infrared detection front-end optical path and the ranging receiving front-end optical path. The secondary mirror in the optical antenna subsystem has a centrally open structure; the side of the secondary mirror near the single pendulum mirror is connected to the optical path of the infrared detection subsystem, forming the back-end optical path of the infrared detection. The secondary mirror, located away from the single pendulum mirror, is connected to the optical path of the laser ranging subsystem, forming the optical path of the ranging receiver backend.

[0004] Preferably, in the receiving beam combining optical path, the single pendulum mirror, the primary mirror, and the secondary mirror are connected in sequence via optical paths; The primary mirror has a central opening structure.

[0005] Preferably, the back-end optical path of the infrared detection consists of a collimating lens group, a horseshoe lens group, a ranging reflector group, a ranging coupling lens group, and a laser receiver connected in sequence. The optical path formed by connecting the ranging reflector group, the ranging coupling mirror group, and the laser receiver is parallel to the optical path formed by connecting the secondary mirror, the collimating mirror group, and the horseshoe mirror group.

[0006] Preferably, the infrared detection back-end optical route is composed of an antenna three-mirror group, a detection reflector group, a detection lens group, and an infrared detector connected in sequence via optical paths.

[0007] Preferably, the antenna three-mirror group is located at the central through-hole of the primary mirror and connected to the optical path of the secondary mirror.

[0008] Preferably, the ranging laser emission subsystem consists of a laser and a fast-reflecting mirror installed inside the turntable tracking sub-device, and a ranging laser emission reflector installed on the top surface of the turntable tracking sub-device. The laser emitted by the laser inside the turntable tracking sub-device is reflected by a fast-reflecting mirror, passes through the through hole on the top surface of the turntable tracking sub-device, and enters the ranging laser emitting reflector. The optical path is connected between the ranging laser emitting reflector and the single pendulum mirror.

[0009] Preferably, the lens closest to the secondary lens in the antenna three-lens group is a beam splitter; In the antenna three-mirror group, the beam splitter receives the light output from the secondary mirror and outputs it to the middle mirror and the output mirror of the antenna three-mirror group.

[0010] Preferably, on the top surface of the turntable tracking sub-device: the secondary mirror is fixed to the top surface of the turntable tracking sub-device by a secondary mirror mount; The secondary mirror mount adopts a spoke frame structure and is installed on the top surface of the turntable tracking sub-device.

[0011] The technical solution of this invention has the following advantages: This invention provides an airborne compact detection and ranging composite tracking system, which adopts a common aperture for infrared / laser reception and a separate aperture for laser emission. The ranging laser emission is carried out through a fast-reflecting mirror, a laser emission reflector, and a single-pendulum mirror. This design allows for the rational arrangement of optical paths and optomechanical components within a limited space, achieving integrated detection and ranging of the tracking system. It effectively reduces the space and weight occupied by the optical system and meets the requirements of airborne environmental adaptability. It can receive external detection signals with a 180mm aperture, triple-brighten them to the secondary mirror, and then transmit them to various functional branches. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram showing the optical path of a compact airborne detection and ranging composite system according to the present invention. Figure 2 This is a schematic diagram of the overall structure of a compact airborne detection and ranging composite system according to the present invention.

[0014] Explanation of reference numerals in the attached figures: P1. Optical antenna subsystem; P2. Infrared detection subsystem; P3. Laser ranging subsystem; P4. Turntable tracking subsystem; P5. Ranging laser emission subsystem; 1. Secondary mirror; 2. Primary mirror; 3. Antenna three-mirror group; 4. Detection reflector group; 5. Detection lens group; 6. Infrared detector; 7. Collimating mirror group; 8. Horseshoe mirror group; 9. Ranging laser emission reflector; 10. Single pendulum mirror; 11. Ranging reflector group; 12. Coupler group; 13. Laser receiver; 14. Laser. Detailed Implementation

[0015] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] Example 1 To achieve a rational arrangement of optical paths and optomechanical components within a limited space, and to integrate the tracking system's detection and ranging capabilities, the following measures are taken: Figure 1 The present embodiment discloses a compact airborne detection and ranging composite system, including: an optical antenna subsystem P1, an infrared detection subsystem P2, a laser ranging subsystem P3, and a single pendulum mirror 10 installed on the top surface of the turntable tracking subsystem P4; and a ranging laser emission subsystem P5, partly installed inside the turntable tracking subsystem P4 and the remainder installed on the top surface of the turntable tracking subsystem P4. The ranging laser emission subsystem P5 and the single pendulum mirror 10 are connected in sequence to form the ranging laser emission optical path: The infrared detection optical path consists of an infrared detection front-end optical path and an infrared detection rear-end optical path connected together. The ranging receiver optical path consists of the ranging receiver front-end optical path and the ranging receiver back-end optical path; The single pendulum mirror 10 and the optical antenna subsystem P1 are connected to form a receiving beam combining optical path, which serves as both the infrared detection front-end optical path and the ranging receiving front-end optical path. The secondary mirror 1 in the optical antenna subsystem P1 has a central opening structure; the side of the secondary mirror 1 closest to the single pendulum mirror 10 is connected to the optical path of the infrared detection subsystem P2, forming the back-end optical path of the infrared detection. The secondary mirror 1, located away from the single pendulum mirror 10, is connected to the optical path of the laser ranging subsystem P3, forming the optical path of the ranging receiver back end.

[0020] Specifically: Ranging laser emission path: The ranging laser emission subsystem P5 consists of a laser 14 and a fast-reflecting mirror installed inside the turntable tracking sub-device P4, and a ranging laser emission reflector 9 installed on the top surface of the turntable tracking sub-device P4. The laser emitted by the laser 14 inside the turntable tracking sub-device P4 is reflected by a fast-reflecting mirror, passes through the through hole on the top surface of the turntable tracking sub-device P4, and enters the ranging laser emitting reflector 9. The ranging laser emitting reflector 9 and the single pendulum mirror 10 are connected in the optical path.

[0021] like Figure 2 This is a plan view of the optical path principle of a compact airborne detection and ranging composite system; because the fast-reflecting mirror is blocked by the ranging laser emitting mirror 9 when displayed on a planar surface, therefore... Figure 2 The fast-reflecting mirror is not shown in the picture; It should be noted that in practical applications, the target to be measured can be roughly located by rotating the turntable tracking device P4. In this embodiment, a 1064nm laser 14 is used to emit laser light. After being reflected by the fast-reflecting mirror inside the turntable tracking device P4, the laser light enters the ranging laser reflector 9. After being reflected by the ranging laser reflector 9, the laser light reaches the pendulum mirror 10. After being reflected by the pendulum mirror 10, the laser light reaches the target to be measured. This completes the transmission process of the ranging laser emission optical path. Infrared detection optical path: like Figure 2 As shown, in the receiving beam combining optical path of the infrared detection front-end optical path, the single pendulum mirror 10, the primary mirror 2, and the secondary mirror 1 are connected in sequence. The infrared detection back-end optical path consists of antenna three-mirror group 3, detection reflector group 4, detection lens group 5 and infrared detector 6 connected in sequence.

[0022] The antenna three-lens assembly 3 is located at the central through-hole of the primary mirror 2 and is connected to the optical path of the secondary mirror 1. The lens in the antenna three-lens assembly 3 closest to the secondary mirror 1 is a beam splitter; in the antenna three-lens assembly, the beam splitter receives the light output from the secondary mirror 1 and outputs it to the middle and output lenses of the antenna three-lens assembly. It should be noted that in this embodiment, both the secondary mirror 1 and the primary mirror 2 have been perforated, resulting in the structure described in this embodiment; furthermore, in this embodiment, the antenna three-lens assembly 3 is fixed to the back plate of the primary mirror 2 by spacers and three evenly distributed screws, thus filling the hole perforated in the center of the primary mirror 2 of the optical antenna system. In this embodiment, the beam splitter transmits infrared detection light and reflects 1064nm ranging return light. The hole in the middle of the secondary mirror 1 is to allow the ranging return light reflected by the beam splitter in the antenna three-mirror group 3 to enter the optomechanical components of the subsequent laser ranging subsystem to complete the laser ranging function. The antenna three-mirror group 3 in the middle of the primary mirror 2 is to receive the external infrared detection light reflected by the secondary mirror 1, so that the infrared detection light is transmitted through the beam splitter in the optical antenna three-mirror group 3 and enters the optomechanical components of the subsequent infrared detection subsystem to complete the infrared detection function of the system.

[0023] Specifically: the infrared detection light of the external signal is reflected by the single pendulum mirror 10 and enters the main mirror 2 of the optical antenna system. It is then reflected by the main mirror 2 to the secondary mirror 1 of the optical antenna system. After being reflected by the secondary mirror 1, it enters the antenna three-mirror group 3. After being transmitted through the beam splitter in the antenna three-mirror group 3, it passes through the antenna three-mirror group 3 to the detection reflector group 4. After being reflected by the detection reflector group 4, it enters the detection lens group 5 and is further coupled to the photosensitive area of ​​the infrared detector 6. The infrared detector 6 converts the light signal into an electrical signal according to the incoming light beam. The camera in the infrared detector 6 completes the imaging, thus completing the acquisition of the target.

[0024] After the infrared detection system completes its detection task, the ranging laser emission subsystem begins to operate. Ranging and receiving optical path: like Figure 2 As shown, in the receiving beam combining optical path of the ranging receiver front-end, the single pendulum mirror 10, the primary mirror 2, and the secondary mirror 1 are connected in sequence; among them, the primary mirror 2 has a central opening structure.

[0025] The optical path of the ranging receiver back end is composed of collimating lens group 7, horseshoe lens group 8, ranging reflector group 11, ranging coupling lens group 12 and laser receiver 13 connected in sequence. The optical path formed by the connection of the ranging mirror group 11, the ranging coupling mirror group 12, and the laser receiver 13 is parallel to the optical path formed by the connection of the secondary mirror 1, the collimating mirror group 7, and the horseshoe mirror group 8.

[0026] Specifically: the light emitted by the ranging laser emission path has reached the target to be measured. The ranging return beam reflected by the target to the pendulum mirror 10, and after being reflected by the pendulum mirror 10, it enters the primary mirror 2. After being reflected by the primary mirror 2, it enters the secondary mirror 1, the collimating mirror group 7 and the horseshoe mirror group 8. After further reflection, it enters the ranging reflector group 11. After being reflected by the ranging reflector group 11, it enters the coupling mirror group 12, and finally enters the laser receiver 13. The laser receiver 13 processes the incident ranging return beam to complete the distance measurement with the target. Thus, the infrared detection and laser ranging functions of the overall system are completed.

[0027] Example 2 Based on Embodiment 1, this embodiment further discloses the specific installation structure of each component in a compact airborne detection and ranging composite system; the optical antenna subsystem P1 includes a primary mirror, a primary mirror chamber, a secondary mirror, a secondary mirror tube, a secondary mirror fixing spoke frame, a first gasket, and a first pressure ring.

[0028] The primary mirror mount is fixed to one side of the top surface of the turntable tracking sub-device P4; the single pendulum mirror 10 is fixed to the other side of the top surface of the turntable tracking sub-device P4; on the top surface of the turntable tracking sub-device P4: the secondary mirror 1 is fixed to the top surface of the turntable tracking sub-device P4 through the secondary mirror mount. The secondary mirror mount adopts a spoke frame structure and is installed on the top surface of the turntable tracking sub-device P4. It should be noted that the spoke frame structure typically consists of a circular shell and an internally fixed spoke frame; this structure is common knowledge in bicycle wheel design and will not be further described in this embodiment. In this embodiment, the secondary mirror fixing spoke frame fixes the secondary mirror 1 to the center position of the secondary mirror barrel. In this embodiment, based on the working environment, the primary mirror mount adopts an integrated structure, characterized by high strength and high rigidity. The primary mirror 2 is fixed to the primary mirror chamber of the primary mirror mount through the injection hole and the first pressure ring. During actual assembly, the secondary mirror 1 is positioned optimally by grinding the first shim, adjusting its thickness, and changing the position of the secondary mirror 1's central axis. Since the collimating mirror group 7 and the ranging reflector group 11 are fixed on the secondary mirror mounting spoke frame of the secondary mirror mount, stress-relieving grooves are provided at the mounting positions of the secondary mirror mounting spoke frame and the collimating mirror group 7 to reduce stress affecting the antenna secondary mirror. The primary mirror mount, spoke frame, and secondary mirror barrel are made of Invar 4J32 steel, which has good corrosion resistance and high strength. The secondary mirror pressure ring and the first shim are made of aluminum alloy 2A12, which is lightweight and easy to process.

[0029] The mounting structure of the antenna three-lens group 3 specifically includes: antenna three-lens group lens barrel, spacer ring, second gasket, second pressure ring and connecting plate.

[0030] The middle and output lenses of the antenna three-lens group 3 are both lenses; the lens barrel of the antenna three-lens group is fixed to the connecting plate by three evenly distributed screws. In actual application, the azimuth and elevation of the optical antenna three-lens group 3 are adjusted by grinding and adjusting the thickness of the second shim. The lens barrel structure and connecting plate of the antenna three-lens group are made of aluminum alloy 2A12, which is lightweight and easy to process.

[0031] The mounting structure of collimating lens group 7 includes a collimating lens group mount, a third pressure ring, a collimating lens group tube, and a third gasket. The collimating lens group tube has three support points. The azimuth and elevation of collimating lens group 7, mounted on the collimating lens group tube, are adjusted by adjusting the thickness of the third gasket. To minimize the obstruction ratio of the optical antenna, collimating lens group 7 is also fixed inside the collimating lens group tube using a spoke frame structure and is lightweight. The collimating lens group tube is mounted on the secondary lens mount using six evenly distributed screws. The collimating lens group mount is made of Invar 4J32 steel, which provides good corrosion resistance and high strength. The collimating lens group tube is made of aluminum alloy 2A12, which is lightweight and easy to process.

[0032] The mounting structure of the horseshoe-shaped mirror assembly 8 includes a horseshoe-shaped mirror assembly mount, a horseshoe-shaped mirror assembly tube, and a fourth shim. The horseshoe-shaped mirror assembly tube has three support points. The azimuth and elevation of the horseshoe-shaped mirror assembly 8, installed within the tube, are adjusted by adjusting the thickness of the fourth shim. To minimize the obstruction ratio of the optical antenna, the horseshoe-shaped mirror assembly 8 is also designed with a spoke frame structure for fixation. It is mounted on the collimating mirror mount via the horseshoe-shaped mirror assembly tube. Both the horseshoe-shaped mirror assembly tube and mount are lightweight, made of aluminum alloy 2A12, which is lightweight and easy to manufacture.

[0033] The mounting structure of the rangefinder mirror assembly 11 includes a rangefinder mirror mount, a fourth pressure ring, and a fifth gasket. The rangefinder mirror assembly 11 is installed in the mirror chamber of the rangefinder mirror mount using both the fourth pressure ring and adhesive. The mirror chamber is designed with three evenly distributed mounting lugs. The rangefinder mirror assembly 11 is installed at the mounting lugs using screws. The attitude and position of the rangefinder mirror assembly 11 are adjusted by adjusting the thickness of the fifth gasket. The rangefinder mirror mount is made of titanium alloy TC4, a material known for its good thermal stability.

[0034] The mounting structure of the coupling lens assembly 12 consists of a spacer, a fifth pressure ring, a coupling lens assembly barrel, a coupling lens assembly mount, and a sixth shim. In actual assembly, the spacing of the optical lenses is adjusted by grinding the spacer between the coupling lenses in the coupling lens assembly 12; the azimuth and pitch of the coupling lens assembly 12 are adjusted by adjusting the sixth shim. The coupling lens assembly barrel is made of aluminum alloy 2A12, which is lightweight and easy to process. The coupling lens assembly mount is made of titanium alloy TC4, which has good thermal stability.

[0035] The ranging laser reflector 9 adopts a horseshoe mirror shape. It is mounted on the ranging laser receiving horseshoe mirror mount via the ranging laser reflector barrel. The ranging laser reflector barrel has 3 support points. The azimuth and pitch of the ranging laser reflector 9 are adjusted by adjusting the seventh shim.

[0036] It should be noted that the use of spacers between the lens and the mount or the lens barrel is common knowledge in the art, therefore, the connection relationship will not be described in detail in this embodiment. In addition, in order to balance the height of the ranging mirror group 11, the coupling mirror group 12, and the laser receiver 13 with respect to the optical axis, in this embodiment, the ranging mirror group 11, the coupling mirror group 12, and the laser receiver 13 are all fixed to the top surface of the turntable tracking device P4 by a support structure.

[0037] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A compact airborne detection and ranging composite system, characterized in that, include: The optical antenna subsystem (P1), infrared detection subsystem (P2), laser ranging subsystem (P3), and single pendulum mirror (10) are installed on the top surface of the turntable tracking subsystem (P4); and a ranging laser emission subsystem (P5) is partially installed inside the turntable tracking subsystem (P4) and partially installed on the top surface of the turntable tracking subsystem (P4). The ranging laser emission subsystem (P5) and the single pendulum mirror (10) are connected in sequence to form the ranging laser emission optical path: The infrared detection optical path consists of an infrared detection front-end optical path and an infrared detection back-end optical path; The ranging receiver optical path consists of the optical path of the ranging receiver front end and the optical path of the ranging receiver back end. The single pendulum mirror (10) and the optical antenna subsystem (P1) are connected to form a receiving beam combining optical path, which serves as both the infrared detection front-end optical path and the ranging receiving front-end optical path. The secondary mirror (1) in the optical antenna subsystem (P1) has a central opening structure; the secondary mirror (1) is connected to the optical path of the infrared detection subsystem (P2) on the side close to the single pendulum mirror (10), forming the back-end optical path of the infrared detection. The secondary mirror (1) is connected to the optical path of the laser ranging subsystem (P3) on the side away from the single pendulum mirror (10) to form the optical path of the ranging receiver back end.

2. The compact airborne detection and ranging composite system according to claim 1, characterized in that, In the receiving beam combining optical path, the single pendulum mirror (10), the primary mirror (2), and the secondary mirror (1) are connected in sequence; Among them, the main mirror (2) has a central opening structure.

3. The compact airborne detection and ranging composite system according to claim 1, characterized in that, The infrared detection back-end optical path is composed of collimating lens group (7), horseshoe lens group (8), ranging reflector group (11), ranging coupling lens group (12) and laser receiver (13) connected in sequence. The optical path formed by connecting the ranging mirror group (11), the ranging coupling mirror group (12), and the laser receiver (13) is parallel to the optical path formed by connecting the secondary mirror (1), the collimating mirror group (7), and the horseshoe mirror group (8).

4. A compact airborne detection and ranging composite system according to claim 1, characterized in that, The infrared detection back-end optical path is composed of the antenna three-mirror group (3), the detection reflector group (4), the detection lens group (5) and the infrared detector (6) connected in sequence.

5. A compact airborne detection and ranging composite system according to claim 4, characterized in that, The antenna three-mirror group (3) is located at the central through hole of the main mirror (2) and is connected to the optical path of the secondary mirror (1).

6. A compact airborne detection and ranging composite system according to claim 1, characterized in that, The ranging laser emission subsystem (P5) consists of a laser (14) and a fast reflector installed inside the turntable tracking sub-device (P4), and a ranging laser emission reflector (9) installed on the top surface of the turntable tracking sub-device (P4). The laser emitted by the laser (14) inside the turntable tracking sub-device (P4) is reflected by the fast reflector and enters the ranging laser emission reflector (9) through the through hole on the top surface of the turntable tracking sub-device (P4). The optical paths of the ranging laser emission reflector (9) and the pendulum mirror (10) are connected.

7. A compact airborne detection and ranging composite system according to claim 5, characterized in that, In the antenna three-mirror group (3), the lens closest to the secondary mirror (1) is a beam splitter; In the antenna three-mirror group (3), the beam splitter receives the light output from the secondary mirror (1) and outputs it to the middle mirror and the output mirror of the antenna three-mirror group (3).

8. A compact airborne detection and ranging composite system according to claim 3, characterized in that, On the top surface of the turntable tracking sub-device (P4): the secondary mirror (1) is fixed to the top surface of the turntable tracking sub-device (P4) by the secondary mirror mount; The secondary mirror mount adopts a spoke frame structure and is installed on the top surface of the turntable tracking sub-device (P4).

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