Satellite-ground communication terminal of low-orbit satellite

Abstract

The utility model discloses a satellite-ground communication terminal of a low-orbit satellite, relates to the field of satellite communication, and is used for solving the problems of high degree of freedom and shock resistance of the satellite-ground communication terminal. The terminal comprises a three-axis adjusting system, and the three-axis adjusting system is connected with the antenna surface so as to adjust the azimuth angle, the roll angle and the pitch angle of the antenna surface. The three-axis adjusting system is mounted on the antenna base; and a damping mechanism is arranged in the antenna base and is connected with the three-axis adjusting system. The designed terminal has three adjustment freedom degrees of azimuth angle, roll angle and pitch angle, and a damping mechanism is arranged under the three-axis adjustment system, so that vibration in the movement process can be effectively absorbed, and the operation stability of the terminal is improved.

Description

Technical Field

[0001] This utility model relates to a satellite communication terminal, and more particularly to a satellite-to-ground communication terminal for low-orbit satellites. Background Technology

[0002] Low Earth Orbit (LEO) satellites are satellites that typically orbit the Earth in specific orbits ranging from 100 to 2000 km above the ground. Due to the high-speed motion of LEO satellites, ground station antennas not only need to continuously track the satellite's movement but also need to maintain constant pointing relative to it. Furthermore, the frequency of the received carrier signal must change to match the satellite's beam switching, requiring the ground station antenna to continuously switch between satellites. Therefore, to ensure continuous communication within the effective timeframe, ground station antennas require high alignment accuracy and must constantly and automatically track and align with the target satellite. This places higher demands on the tracking accuracy and dynamism of ground antennas. Consequently, LEO satellite tracking antennas must possess high degrees of freedom and good continuity to quickly switch to the target satellite during communication satellite switching.

[0003] In addition, for portable ground stations or vehicle-mounted or airborne ground stations, satellite alignment is involved during movement, which will inevitably be subject to vibration caused by movement. Vibration has a significant impact on the satellite alignment accuracy of the antenna, so it is necessary to consider appropriate vibration elimination. Utility Model Content

[0004] The purpose of this invention is to provide a low-orbit satellite-to-ground communication terminal to address the aforementioned problems, thereby solving the issues of high degree of freedom and earthquake resistance required for satellite-to-ground communication terminals.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A low-orbit satellite ground communication terminal includes a three-axis adjustment system connected to an antenna surface for adjusting the azimuth, roll, and pitch angles of the antenna surface; the three-axis adjustment system is mounted on an antenna base; a shock-absorbing mechanism is installed inside the antenna base and is connected to the three-axis adjustment system.

[0007] Furthermore, the vibration damping mechanism includes a vibration damping base, a steel wire vibration damper, a vibration damping base, and a mounting shaft; the vibration damping base is fixedly installed inside the antenna base, the steel wire vibration damper is located between the vibration damping base and the vibration damping base, the mounting shaft is fixedly connected to the top of the vibration damping base, and the mounting shaft is connected to the three-axis adjustment system; a first limiting component is also connected between the vibration damping base and the vibration damping base, the first limiting component restricting the degree of freedom of movement of the vibration damping base in the direction of approaching and moving away from the vibration damping base.

[0008] Furthermore, the first limiting component includes a guide shaft and a guide shaft sleeve, the guide shaft and the guide shaft sleeve being coaxially connected, the guide shaft being vertically connected to one of the damping base or the damping seat, and the guide shaft sleeve being vertically connected to the other of the damping base or the damping seat.

[0009] Furthermore, the three-axis adjustment system includes an azimuth adjustment mechanism for adjusting the azimuth angle of the antenna surface, which includes a crossed roller bearing and an azimuth rotation platform. The stator of the crossed roller bearing is connected to the damping mechanism, and the azimuth rotation platform is connected to the rotor of the crossed roller bearing. An azimuth drive mechanism is mounted on the azimuth rotation platform, and an azimuth driven gear is connected to the stator of the crossed roller bearing. The azimuth drive mechanism and the azimuth driven gear are connected in a transmission connection.

[0010] Furthermore, the three-axis adjustment system includes a roll adjustment mechanism for adjusting the roll angle of the antenna surface, the roll adjustment mechanism being supported by a column support mechanism; the roll adjustment mechanism includes a roll drive mechanism, a roll drive shaft, a roll support arm, and a roll limiting mechanism; the roll drive shaft passes vertically through the column support mechanism; the roll drive mechanism is connected to the shaft end of the roll drive shaft; the roll support arm connects to the roll drive shaft from both sides and bends towards the antenna surface; the roll limiting mechanism limits the rotation angle of the roll drive shaft.

[0011] Furthermore, the roll limiting mechanism includes a first electronic limiting component, which includes a second magnet disposed on the roll drive mechanism and a second sensor fixedly disposed on the column support mechanism.

[0012] Furthermore, the roll limiting mechanism includes a first mechanical limiting component, which includes a first limiting body disposed at the bottom of the roll support arms on both sides. The first limiting body interferes with the column support mechanism as the roll support arms rotate.

[0013] Furthermore, the three-axis adjustment system includes a pitch adjustment mechanism for adjusting the pitch angle of the antenna surface, which includes a pitch drive mechanism, a pitch axis, and a pitch limiting mechanism; the pitch axis passes vertically through the roll support arm; the pitch drive mechanism is connected to the shaft end of the pitch axis; and the pitch limiting mechanism limits the rotation angle of the pitch axis.

[0014] Furthermore, the pitch limiting mechanism includes a second mechanical limiting component, which includes a second limiting body disposed on the pitch drive mechanism. The second limiting body interferes with the roll support arm as the pitch drive mechanism rotates.

[0015] Furthermore, the antenna base is provided with a positioning component, which includes a telescopic rod installed inside the antenna base and a positioning device connected to the end of the telescopic rod.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0017] This designed satellite-to-ground communication terminal is used for satellite communication and targeting of low-Earth orbit satellites. A three-axis adjustment system allows the antenna surface to rotate in three degrees of freedom: azimuth, roll, and pitch, enabling flexible and continuous orientation adjustment. Furthermore, a vibration damping mechanism within the three-axis adjustment system absorbs vibrations caused by handling and movement, improving the terminal's operational stability. Additionally, the positioning device is mounted on the antenna base via a telescopic rod, extending only during positioning, reducing the terminal's storage size while improving positioning accuracy. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the satellite-to-ground communication terminal in one embodiment of this application.

[0019] Figure 2 This is a rear view of one embodiment of the satellite-to-ground communication terminal of this application.

[0020] Figure 3 This is a side view of one embodiment of the satellite-to-ground communication terminal of this application.

[0021] Figure 4 This is a partial structural diagram of the azimuth adjustment mechanism of the satellite-to-ground communication terminal in one embodiment of this application.

[0022] Figure 5 This is a partial structural diagram of the roll adjustment mechanism in one embodiment of the satellite-to-ground communication terminal of this application.

[0023] The markings in the diagram are as follows: 1 is the antenna base, 2 is the shock absorption mechanism, 3 is the azimuth adjustment mechanism, 4 is the roll adjustment mechanism, 5 is the pitch adjustment mechanism, 6 is the antenna surface, 11 is the telescopic rod, 12 is the positioning device, 21 is the shock absorption base, 22 is the shock absorption base, 23 is the wire vibration damper, 24 is the mounting shaft, 25 is the guide bushing, 26 is the guide shaft, 31 is the crossed roller bearing, 32 is the azimuth rotation platform, 33 is the first motor, 34 is the azimuth driven gear, 35 is the first magnet, 36 is the first sensor, 37 is the column support mechanism, 41 is the second motor, 42 is the roll driven gear, 43 is the roll drive shaft, 44 is the roll support arm, 45 is the second sensor, 46 is the second magnet, 47 is the first limit body, 51 is the third motor, 52 is the pitch driven gear, 53 is the pitch shaft, 54 is the third sensor, 55 is the third magnet, and 56 is the second limit body. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings.

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] In response to the requirement that satellite-to-ground communication terminals have high degrees of freedom due to the high-speed movement of low-orbit satellites, this application proposes a satellite-to-ground communication terminal that aims to achieve multi-degree-of-freedom movement of the antenna surface and has anti-vibration properties.

[0027] The satellite-to-ground communication terminal proposed in this application includes a three-axis adjustment system, such as... Figure 1 As shown, the three-axis adjustment system is connected to the antenna surface 6 to adjust the antenna surface 6 in three degrees of freedom: azimuth, roll, and pitch. By combining the three degrees of freedom, the antenna surface 6 can be adjusted to any orientation to meet the requirements for satellite alignment.

[0028] The three-axis adjustment system is mounted on the antenna base 1. To meet the satellite alignment requirements in mobile scenarios, a shock-absorbing mechanism 2 is installed inside the base, which is connected to the three-axis adjustment system. Thus, the vibrations experienced by the terminal during movement are absorbed by the shock-absorbing mechanism 2, ensuring the stability of the three-axis adjustment system and consequently the stability of the antenna surface 6's orientation.

[0029] Typically, to protect the antenna surface 6 and the three-axis adjustment system, an antenna cover (not shown) is installed on the antenna base 1. The antenna cover encloses the antenna surface 6 and the entire three-axis adjustment system inside, exposing only the antenna base 1 (the antenna base 1 needs to be connected to the outside with necessary cables).

[0030] In some embodiments, such as Figure 2 As shown, the vibration damping mechanism 2 includes a vibration damping base 21, a wire vibration damper 23, a vibration damping base 22, and a mounting shaft 24. The vibration damping base 21 is fixedly installed inside the antenna base 1. The wire vibration damper 23 is located between the vibration damping base 21 and the vibration damping base 22. The mounting shaft 24 is fixedly connected to the top of the vibration damping base 22 and is connected to the three-axis adjustment system. A first limiting component is also connected between the vibration damping base 21 and the vibration damping base 22. This first limiting component restricts the degree of freedom of movement of the vibration damping base 22 to the directions of approaching and moving away from the vibration damping base 21. In this way, when the three-axis adjustment system vibrates, it only moves up and down and does not sway left and right significantly.

[0031] For the wire vibration damper 23, in some feasible implementations, under the condition of ensuring strength, stiffness and accuracy, a combination of longitudinal and transverse spring structure is adopted, which can effectively absorb vibration and reduce the impact of vibration on the antenna surface 6.

[0032] In some embodiments, the first limiting component includes a guide shaft 26 and a guide sleeve 25, which are coaxially connected to ensure that the guide shaft 26 is restricted to axial movement within the guide sleeve 25. Of course, within the allowable tolerance range, the guide shaft 26 is also allowed to have slight offset in the lateral direction. The guide shaft 26 is vertically connected to one of the damping base 21 or the damping base 22, while the guide sleeve 25 is vertically connected to the other of the damping base 21 or the damping base 22. Figure 3 As shown, in one possible manner, the guide shaft 26 is connected to the damping base 21, and the guide shaft sleeve 25 is connected to the damping base 22.

[0033] The first limiting component also needs to ensure the stability of the up-and-down movement of the three-axis adjustment system. Therefore, the first limiting component includes at least three sets of different lines. For example, four sets of first limiting components are installed in a rectangular distribution between the damping base 21 and the damping base 22, and the four sets of first limiting components surround the steel wire damper.

[0034] The three-axis adjustment system includes an azimuth adjustment mechanism 3, a roll adjustment mechanism 4, and a pitch adjustment mechanism 5, which are used to adjust the azimuth, roll, and pitch angles of the antenna surface 6, respectively.

[0035] In some embodiments, such as Figure 2 , Figure 3 As shown, the azimuth adjustment mechanism 3 includes a crossed roller bearing 31 and an azimuth rotation platform 32. The stator of the crossed roller bearing 31 is connected to the damping mechanism 2, and the azimuth rotation platform 32 is connected to the rotor of the crossed roller bearing 31. An azimuth drive mechanism is mounted on the azimuth rotation platform 32, and an azimuth driven gear 34 is connected to the stator of the crossed roller bearing 31. The azimuth drive mechanism and the azimuth driven gear 34 are connected in a transmission connection. Thus, when the azimuth drive mechanism rotates, since the azimuth driven gear 34 is fixed on the stator of the crossed roller bearing 31, the azimuth drive mechanism will rotate around the circumference of the azimuth driven gear 34, thereby driving the entire azimuth rotation platform 32 to rotate around the azimuth driven gear 34. During this process, the crossed roller bearing 31 provides rotational support for the azimuth rotation platform 32.

[0036] In some possible implementations, the inner ring of the crossed roller bearing 31 is fixedly connected to the damping mechanism 2, for example, to the mounting shaft 24 of the damping mechanism 2 in the above embodiment, serving as a stator, and an azimuth driven gear 34 is connected to the top of the inner ring. The outer ring of the crossed roller bearing 31 serves as a rotor, connected to the azimuth rotation platform 32 to support the rotation of the azimuth rotation platform 32. An azimuth drive mechanism is vertically mounted on the azimuth rotation platform 32, for example, a first motor 33 with a gear connected to its output shaft. This first motor 33 is connected to the azimuth driven gear 34 via a ring rack, or directly meshes with the azimuth driven gear 34 to achieve a transmission connection. The azimuth driven gear 34 can adopt a circular arc tooth profile, which can meet the requirements of high-power transmission, reduce noise, and ensure smooth operation.

[0037] In principle, the azimuth drive mechanism can drive the azimuth rotation platform 32 to rotate continuously by 360 degrees. However, considering the need to determine the azimuth angle, it is necessary to determine the return-to-center position, i.e., the 0-degree azimuth angle. In some embodiments, the azimuth adjustment mechanism 3 further includes an azimuth limiting mechanism, which is used to indicate that the azimuth rotation platform 32 has rotated to the return-to-center position.

[0038] As a feasible approach, such as Figure 4 As shown, the orientation limiting mechanism includes a first sensor 36 and a first magnet 35. The first magnet 35 is mounted on the orientation driven gear 34 corresponding to the aligning position of the orientation rotation platform 32, and the first sensor 36 is mounted on the corresponding position on the orientation rotation platform 32. For example, the first magnet 35 is mounted at the bottom of the orientation driven gear 34, corresponding to the aligning position of the orientation rotation platform 32, and the first sensor 36 is mounted directly below the first magnet 35 when the orientation rotation platform 32 is in the aligning position. When the first sensor 36 is aligned with the first magnet 35, the orientation rotation platform 32 is in the aligning position.

[0039] In some embodiments, such as Figure 3 As shown, the roll adjustment mechanism 4 is supported by a column support mechanism 37. This column support mechanism 37 can be connected to the azimuth rotation platform 32 in the above embodiment, preferably at a slightly inclined angle to the azimuth rotation platform 32. In some feasible embodiments, the column support mechanism 37 is a box-shaped structure with a square frame. This structure can achieve a large hollow cross-section, possessing good bending and torsional stiffness, meeting the complex load requirements of the low-orbit satellite antenna during operation. The bottom end of the column support mechanism 37 is connected to the azimuth rotation platform 32, and the top end is connected to the roll adjustment mechanism 4.

[0040] The roll adjustment mechanism 4 includes a roll drive mechanism, a roll drive shaft 43, roll support arms 44, and a roll limiting mechanism. The roll drive shaft 43 vertically penetrates the column support mechanism 37, and a bearing is typically fitted onto the roll drive shaft 43. The roll drive mechanism is connected to the shaft end of the roll drive shaft 43 to drive the roll drive shaft 43 to rotate at the end of the column support mechanism 37. The roll support arms 44 are connected to the roll drive shaft 43 from both sides (left and right) and bend towards the antenna surface 6; thus, under the action of the roll drive mechanism, the roll support arms 44 on both sides will drive the antenna surface 6 to rotate around the axial direction of the roll drive shaft 43. In addition, to prevent excessive roll angle rotation, the roll limiting mechanism limits the rotation angle of the roll drive shaft 43.

[0041] In some embodiments, the roll limiting mechanism includes a first electronic limiting component, such as... Figure 3 , Figure 5 As shown, the first electronic limiting component includes a second magnet 46 disposed on the roll drive mechanism and a second sensor 45 fixedly disposed on the column support mechanism 37. When the second magnet 46 on the roll drive mechanism rotates to the position of the second sensor 45, the sensing signal generated by the second sensor 45 restricts the roll drive mechanism from continuing to rotate in the current direction.

[0042] As a feasible approach, the first electronic limit assembly includes two second sensors 45 and two second magnets 46. The roll drive mechanism includes a second motor 41 with a gear on its output shaft and a roll driven gear 42. The roll driven gear 42 is connected to the shaft end of the roll drive shaft 43. The second motor 41 is mounted on the column support mechanism 37 and connected to the roll driven gear 42 via a ring rack. The two second magnets 46 are respectively mounted on the left and right sides of the roll driven gear 42. The two second sensors 45 are respectively arranged on the column support mechanism 37 at positions relative to the roll driven gear 42 rotated from the initial state by -35 degrees and +35 degrees (other angles are also possible). When the second motor 41 drives the roll driven gear 42 to rotate to the -35-degree or +35-degree position, the second sensor 45, sensing the signal fed back by the second magnet 46, will cause the second motor 41 to stop rotating or rotate in the opposite direction, ensuring that the roll adjustment mechanism 4 is not damaged due to exceeding the limit.

[0043] In some embodiments, the roll limiting mechanism includes a first mechanical limiting component, such as... Figure 3 , Figure 5 As shown, the first mechanical limiting assembly includes a first limiting body 47 disposed at the bottom of the two side roll support arms 44. The first limiting body 47 interferes with the column support mechanism 37 as the roll support arms 44 rotate. In this way, damage can be prevented from occurring due to rigid collision between the roll support arms 44 and the column support mechanism 37 when the roll support arms 44 rotate excessively.

[0044] The roll limiting mechanism may include one of a first electronic limiting component and a first mechanical limiting component, or both.

[0045] For the pitch adjustment mechanism 5, in some embodiments, such as Figure 2 , Figure 3 As shown, it includes a pitch drive mechanism, a pitch shaft 53, and a pitch limit mechanism. The pitch shaft 53 vertically passes through the roll support arm 44, and a bearing is typically fitted onto the pitch shaft 53. The pitch drive mechanism is connected to the shaft end of the pitch shaft 53. The pitch limit mechanism limits the rotation angle of the pitch shaft 53.

[0046] As a feasible approach, the pitch drive mechanism includes a third motor 51 with a gear connected to its output shaft, and a pitch driven gear 52. The third motor 51 is mounted on the outside of the roll support arm 44, and a pitch shaft 53 extends vertically through the end of the roll support arm 44. One end of the pitch shaft 53 is connected to the antenna surface 6, and the other end is connected to the pitch driven gear 52. The third motor 51 and the pitch driven gear 52 are connected by a ring rack transmission. The rotation of the third motor 51 drives the pitch driven gear 52 to rotate, thereby driving the pitch shaft 53 to rotate, thus adjusting the pitch angle of the antenna surface 6.

[0047] In some embodiments, the pitch limiting mechanism includes a second electronic limiting component, which has a similar structure to the first electronic limiting component. For example... Figure 2 , Figure 3 As shown, the second electronic limit assembly includes two third sensors 54 and two third magnets 55. Both third magnets 55 are mounted on the pitch follower gear 52, and the two third sensors 54 are respectively mounted on the roll support arm 44 at positions corresponding to the pitch follower gear 52 rotating -10 degrees and +110 degrees (other angles are also acceptable) from its initial state.

[0048] In other embodiments, the pitch limiting mechanism includes a second mechanical limiting component, such as... Figure 2 As shown, the second mechanical limiting component includes a second limiting body 56 disposed on the pitch drive mechanism. The second limiting body 56 interferes with the roll support arm 44 as the pitch drive mechanism rotates.

[0049] As a feasible method, there are two second limiting bodies 56, which are respectively vertically installed on the edge of the pitch driven gear 52. The pitch driven gear 52 stops rotating when the second limiting body 56 hits the roll support arm 44, to prevent the antenna surface 6 from hitting the roll adjustment mechanism 4 and being damaged.

[0050] Typically, satellite-to-ground communication terminals require positioning, i.e., they are equipped with positioning devices 12 (such as GPS). In some embodiments, a positioning component is provided on the antenna base 1, which includes a telescopic rod 11 installed inside the antenna base 1 and a positioning device 12 connected to the end of the telescopic rod 11. During storage and transportation, the telescopic rod 11 retracts, not occupying too much space; during positioning, the telescopic rod 11 extends for positioning.

[0051] In some preferred embodiments, there are at least two positioning components, which are mounted opposite each other on the antenna base 1. Thus, during positioning, the two positioning components extend, increasing the distance between the two positioning devices 12, thereby improving the positioning accuracy of the satellite-to-ground communication terminal.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A satellite-to-ground communication terminal for low-Earth orbit satellites, characterized in that, The antenna includes a three-axis adjustment system connected to the antenna surface for adjusting the azimuth, roll, and pitch angles of the antenna surface; the three-axis adjustment system is mounted on an antenna base; a shock-absorbing mechanism is installed inside the antenna base and is connected to the three-axis adjustment system.

2. The low-orbit satellite ground communication terminal as described in claim 1, characterized in that, The vibration damping mechanism includes a vibration damping base, a steel wire vibration damper, a vibration damping base, and a mounting shaft. The vibration damping base is fixedly installed inside the antenna base. The steel wire vibration damper is located between the vibration damping base and the vibration damping base. The mounting shaft is fixedly connected to the top of the vibration damping base and is connected to the three-axis adjustment system. A first limiting component is also connected between the vibration damping base and the vibration damping base. The first limiting component restricts the degree of freedom of movement of the vibration damping base in the directions of approaching and moving away from the vibration damping base.

3. The low-orbit satellite ground communication terminal as described in claim 2, characterized in that, The first limiting component includes a guide shaft and a guide sleeve, the guide shaft and the guide sleeve being coaxially connected, the guide shaft being vertically connected to one of the damping base or the damping seat, and the guide sleeve being vertically connected to the other of the damping base or the damping seat.

4. The low-orbit satellite ground communication terminal as described in claim 1, characterized in that, The three-axis adjustment system includes an azimuth adjustment mechanism for adjusting the azimuth angle of the antenna surface. The mechanism includes a crossed roller bearing and an azimuth rotation platform. The stator of the crossed roller bearing is connected to the damping mechanism, and the azimuth rotation platform is connected to the rotor of the crossed roller bearing. An azimuth drive mechanism is mounted on the azimuth rotation platform, and an azimuth driven gear is connected to the stator of the crossed roller bearing. The azimuth drive mechanism and the azimuth driven gear are connected in a transmission connection.

5. The low-orbit satellite ground communication terminal as described in claim 1, characterized in that, The three-axis adjustment system includes a roll adjustment mechanism for adjusting the roll angle of the antenna surface, which is supported by a column support mechanism. The roll adjustment mechanism includes a roll drive mechanism, a roll drive shaft, a roll support arm, and a roll limiting mechanism. The roll drive shaft passes vertically through the column support mechanism. The roll drive mechanism is connected to the shaft end of the roll drive shaft. The roll support arm is connected to the roll drive shaft from both sides and bends towards the antenna surface. The roll limiting mechanism limits the rotation angle of the roll drive shaft.

6. The low-orbit satellite ground communication terminal as described in claim 5, characterized in that, The roll limiting mechanism includes a first electronic limiting component, which includes a second magnet disposed on the roll drive mechanism and a second sensor fixedly disposed on the column support mechanism.

7. The low-orbit satellite ground communication terminal as described in claim 5, characterized in that, The roll limiting mechanism includes a first mechanical limiting component, which includes a first limiting body disposed at the bottom of the two roll support arms. The first limiting body interferes with the column support mechanism as the roll support arms rotate.

8. The low-orbit satellite ground communication terminal as described in claim 5, characterized in that, The three-axis adjustment system includes a pitch adjustment mechanism for adjusting the pitch angle of the antenna surface, which includes a pitch drive mechanism, a pitch axis, and a pitch limiting mechanism; the pitch axis passes vertically through the roll support arm; the pitch drive mechanism is connected to the shaft end of the pitch axis; and the pitch limiting mechanism limits the rotation angle of the pitch axis.

9. The low-orbit satellite ground communication terminal as described in claim 8, characterized in that, The pitch limiting mechanism includes a second mechanical limiting component, which includes a second limiting body disposed on the pitch drive mechanism. The second limiting body interferes with the roll support arm as the pitch drive mechanism rotates.

10. The low-orbit satellite ground communication terminal as described in claim 1, characterized in that, The antenna base is provided with a positioning component, which includes a telescopic rod installed inside the antenna base and a positioning device connected to the end of the telescopic rod.

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