Portable satellite communication terminal

Abstract

The utility model discloses a portable satellite communication terminal, relates to the field of satellite terminals, and is used for providing a satellite terminal which is miniaturized, portable and convenient to operate on a satellite. The terminal comprises a case, a pitching mechanism is installed at the top of the case, supporting legs are installed at the bottom of the case, and an antenna surface and a feed source arm are coaxially hinged to the pitching mechanism; an orientation adjusting assembly is installed in the case, the pitching mechanism is connected with an output shaft of the orientation adjusting assembly, a pitching adjusting assembly is installed in the pitching mechanism, and an output shaft of the pitching adjusting assembly is coaxially connected with the antenna surface; and the output shaft of the azimuth adjusting assembly is perpendicular to the output shaft of the pitching adjusting assembly. The satellite communication terminal has the advantages of being small in size, light in weight and convenient to carry.

Description

Technical Field

[0001] The utility model relates to a satellite terminal, in particular to a portable satellite communication terminal. Background Art

[0002] In recent years, with the rapid development of satellite communications, satellite terminals have emerged in large numbers. This is particularly true with the launch and successful orbital testing of ChinaSat-26, the first high-throughput satellite with over 100 Gbps capacity. Compared to ChinaSat-16, it boasts enhanced performance and a wider range of applications. This means that supporting ground-based satellite terminals can be designed with smaller antennas, achieving higher-speed communications and making miniaturized satellite terminal design possible.

[0003] There are a wide variety of ground satellite terminal products on the market today. In order to adapt to different usage environments, different requirements are placed on the performance, size, portability, etc. of satellite terminals. Utility Model Content

[0004] The purpose of the present invention is to provide a portable satellite communication terminal for solving the above-mentioned problems, so as to provide a satellite terminal which is miniaturized, portable and convenient for satellite alignment operation.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A portable satellite communication terminal includes a chassis, a pitch mechanism installed on the top of the chassis, and legs installed on the bottom of the chassis, an antenna surface and a feed arm coaxially hinged on the pitch mechanism; an azimuth adjustment component is installed in the chassis, the pitch mechanism is connected to the output shaft of the azimuth adjustment component, a pitch adjustment component is installed in the pitch mechanism, and the output shaft of the pitch adjustment component is coaxially connected to the antenna surface; the output shaft of the azimuth adjustment component and the output shaft of the pitch adjustment component are perpendicular to each other.

[0007] Furthermore, the azimuth adjustment component includes a servo motor, a transmission component and a harmonic reducer. The servo motor is connected to the harmonic reducer through the transmission component, and the rotating shaft of the harmonic reducer serves as the output shaft of the azimuth adjustment component.

[0008] Furthermore, a radial adjustment block is installed in the chassis, and the servo motor is fixedly installed on the radial adjustment block; a mounting mechanism is provided on the radial adjustment block, and the mounting mechanism has freedom of movement in the distance direction between the radial adjustment block and the harmonic reducer.

[0009] Furthermore, the transmission assembly includes a driving wheel, a synchronous belt and a driven wheel, the driving wheel is connected to the output shaft of the servo motor, the driven wheel is connected to the harmonic reducer, and the synchronous belt is connected between the driving wheel and the driven wheel.

[0010] Furthermore, the pitch adjustment assembly includes a servo module, a pitch active shaft and a pitch driven shaft, the servo module is installed in the pitch mechanism, the pitch active shaft is connected to the output shaft of the servo module, the pitch driven shaft is installed on the pitch mechanism through a pitch bearing on the side opposite to the pitch active shaft, and the pitch driven shaft is coaxial with the pitch active shaft; the antenna surface is circumferentially connected to the pitch active shaft and the pitch driven shaft.

[0011] Furthermore, the pitch mechanism includes a pitch transverse plate, and pitch vertical plates are vertically connected to both sides of the pitch transverse plate, and the pitch module and the pitch bearing are respectively connected to the two pitch vertical plates.

[0012] Furthermore, a ball plunger is provided on the rotating shaft of the antenna surface, and an arc-shaped groove is provided on the rotating shaft of the feed arm corresponding to the active area of the ball plunger; the ball plunger rotates synchronously with the antenna surface, and after contacting the end of the arc-shaped groove, drives the feed arm to rotate together.

[0013] Furthermore, a pitch limiting magnet is provided on the rotating shaft of the antenna surface, and a pitch magnetic switch is provided on the pitch mechanism corresponding to the maximum working angle position and / or the folded position of the antenna surface.

[0014] Furthermore, an azimuth magnetic switch is installed at the bottom of the pitch mechanism, and an azimuth limiting magnetic steel is provided on the top of the chassis corresponding to the extreme azimuth angle position of the pitch mechanism.

[0015] Furthermore, an azimuth limiting pin is provided at the bottom of the pitch mechanism, and an azimuth limiting column is provided at the top of the chassis corresponding to the extreme azimuth angle position of the pitch mechanism.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] The satellite communication terminal designed in this paper is compact, lightweight, and portable. It features two degrees of freedom: azimuth and elevation, both of which are controlled electromechanically. This makes it easy to operate and offers precise angular rotation, meeting the requirements for rapid satellite alignment. The terminal is equipped with electronic limiters (limiting magnets and magnetic switches) in both azimuth and elevation, enabling lossless positioning while preventing excessive torsion of internal wiring due to uncontrolled rotation. Furthermore, a mechanical limiter is incorporated into the azimuth adjustment component to prevent excessive azimuth rotation in the event of failure of the electronic limiter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1FIG1 is a structural diagram of a portable satellite communication terminal in one embodiment.

[0019] Figure 2 is a cross-sectional view of an azimuth adjustment assembly in one embodiment.

[0020] Figure 3 1 is a structural diagram of a support leg in one embodiment.

[0021] Figure 4 FIG. 4 is a top view of a radial adjustment block in one embodiment.

[0022] Figure 5 is a cross-sectional view of a pitch adjustment assembly in one embodiment.

[0023] Figure 6 It is a cross-sectional view of the end of the pitch mechanism in one embodiment.

[0024] Figure 7 FIG. 4 is a structural diagram of a polarization adjustment component in one embodiment.

[0025] Markings in the figure: 1-wire shield, 2-feed arm, 3-wire shield, 4-pitch cover, 5-antenna surface, 6-azimuth bearing, 7-harmonic reducer, 8-azimuth reducer seat, 9-driven wheel, 10-synchronous belt, 11-driving wheel, 12-radial adjustment block, 13-servo motor, 14-chassis, 15-removable battery, 16-leg shaft, 17-leg rotation pin, 18-leg, 19-pitch active shaft, 20-electronic screen, 21-servo module, 22-one-button star alignment button, 23-pitch vertical plate, 24-azimuth limit pin, 25-pitch horizontal plate, 26-azimuth limit magnet, 27-button cover , 28-azimuth magnetic switch, 29-azimuth limit column, 30-transmission plate, 31-pitch driven shaft, 32-pitch bearing, 33-ball head plunger, 34-pitch limit magnet, 35-maximum working angle limit magnetic switch, 36-folding limit magnetic switch, 37-polarization limit magnet, 38-polarization knob, 39-fastening screw, 40-polarization rotor, 41-waveguide cavity, 42-bent waveguide, 43-horn rotation limit magnet, 44-adaptation waveguide, 45-adaptation flange, 46-arc slide groove, 47-transceiver, 48-feed horn, 49-long waist-shaped mounting hole, 50-spherical groove. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings.

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] like Figure 1 As shown, in some embodiments, the portable satellite communication terminal includes a chassis 14, a support leg 18, an antenna surface 5 and a feed arm 2, the support leg 18 is installed at the bottom of the chassis 14, and a pitch mechanism is installed on the top of the chassis 14, and the antenna surface 5 and the feed arm 2 are coaxially hinged on the pitch mechanism.

[0029] An azimuth adjustment assembly is mounted within the chassis 14. Its output shaft extends outside the chassis 14 and connects to the pitch mechanism from the bottom to drive the pitch mechanism's azimuth rotation. Because both the antenna surface 5 and the feed arm 2 are connected to the pitch mechanism, the azimuth adjustment assembly can synchronously adjust the azimuth angles of the antenna surface 5 and the feed arm 2.

[0030] The pitch mechanism houses a pitch adjustment assembly, with the antenna surface 5 (the rotation axis) coaxially connected to the output shaft of the pitch adjustment assembly. Rotation of the pitch adjustment assembly's output shaft drives the pitch angle of the antenna surface 5. The output shaft of the pitch adjustment assembly is perpendicular to the output shaft of the azimuth adjustment assembly.

[0031] A power source is provided in the chassis 14 , such as a removable battery 15 , which supplies power to all electrical devices of the terminal.

[0032] like Figure 2 As shown, the legs 18 at the bottom of the chassis 14 are designed to be retractable. In some embodiments, a leg mounting portion is provided at the bottom of the chassis 14, on which a leg pivot 16 is provided, to which the legs 18 are hingedly connected. Furthermore, the legs 18 are provided with leg rotation pins 17, which are used to limit the position of the legs 18 when they rotate to a certain angle. Of course, limiting the position of the legs 18 can also be achieved through other structures, such as providing a limit block on the leg mounting portion. When the legs 18 rotate to the point where they contact the limit block, they cannot rotate further, thereby achieving position limiting.

[0033] like Figure 2 As shown, in some embodiments, the azimuth adjustment assembly includes a servo motor 13, a transmission assembly, and a harmonic reducer 7. The transmission assembly is connected between the servo motor 13 and the harmonic reducer 7. The servo motor 13 drives the harmonic reducer 7 to rotate through the transmission assembly. The rotating shaft of the harmonic reducer 7 serves as the output shaft of the azimuth adjustment assembly and is connected to the pitch mechanism, driving the pitch mechanism's azimuth rotation.

[0034] like Figure 2As shown, in some embodiments, the output shaft of the servo motor 13 and the rotation axis of the harmonic reducer 7 are parallel to each other, and the transmission assembly includes a driving wheel 11, a synchronous belt 10, and a driven wheel 9. The driving wheel 11 is connected to the output shaft of the servo motor 13, the driven wheel 9 is connected to the bottom of the harmonic reducer 7, and the synchronous belt 10 is connected between the driving wheel 11 and the driven wheel 9. The servo motor 13 rotates to drive the driving wheel 11 to rotate, thereby driving the driven wheel 9 to rotate through the synchronous belt 10. The driven wheel 9 is connected to the harmonic reducer 7 as a whole, so that the rotation axis of the harmonic reducer 7 also rotates, thereby driving the pitch mechanism to rotate.

[0035] like Figure 2 As shown, in some embodiments, the harmonic reducer 7 is mounted in the chassis 14 via an azimuth reducer seat 8. An azimuth bearing 6 is connected between the rotation axis of the harmonic reducer 7 and the pitch structure to ensure coaxiality between the pitch mechanism and the rotation axis of the harmonic reducer 7. The inner wall of the azimuth bearing 6 is connected to the rotation axis of the harmonic reducer 7 through a tolerance connection, and the outer wall is connected to the pitch structure through a tolerance connection.

[0036] Considering that the synchronous belt 10 of the same specification may not necessarily fit the distance between the driving wheel 11 and the driven wheel 9 due to tolerance and other reasons, the transmission effect of the driving wheel 11 on the driven wheel 9 is affected. In some embodiments, a radial adjustment block 12 is installed in the chassis 14, and the servo motor 13 is fixedly installed on the radial adjustment block 12. The radial adjustment block 12 is provided with a mounting mechanism, and the mounting mechanism has the freedom of movement in the distance direction between the radial adjustment block 12 and the harmonic reducer 7. In this way, the servo motor 13 can be synchronously moved by moving the radial adjustment block 12 in a small range, thereby tightening the synchronous belt 10. Figure 4 As shown, in some specific embodiments, the mounting mechanism on the radial adjustment block 12 is a long waist-shaped mounting hole 49, through which a screw passes to secure the radial adjustment block 12. By changing the position of the screw in the long waist-shaped mounting hole 49, the position of the radial adjustment block 12 is moved, thereby changing the distance between the servo motor 13 and the harmonic reducer 7, thereby tightening the synchronous belt 10.

[0037] like Figure 5 As shown, the chassis 14 may also be provided with interfaces for connecting peripheral devices and necessary buttons, such as a one-touch star-pointing button 22 designed to trigger automatic star-pointing. These facilities may be shielded and protected by a button cover 27 to prevent dust and water.

[0038] like Figure 5 As shown, in some embodiments, the pitch adjustment assembly includes a servo module 21, a pitch active shaft 19 and a pitch driven shaft 31. The servo module 21 is installed in the pitch mechanism, and the pitch active shaft 19 is connected to the output shaft of the servo module 21. Figure 5 The output shaft of the servo module 21 is toward the left end of the pitch mechanism; the pitch driven shaft 31 is mounted on the pitch mechanism through the pitch bearing 32, on the side opposite to the pitch active shaft 19 ( Figure 5 The pitch driven axis 31 is coaxial with the pitch active axis 19. The antenna surface 5 is connected to the pitch active axis 19 and the pitch driven axis 31 from the circumferential direction. Figure 5 As shown, the antenna surface 5 can be connected to the pitch active shaft 19 and the pitch driven shaft 31 via a transmission plate 30. In this way, the rotation of the servo module 21 drives the pitch active shaft 19 to rotate, thereby driving the pitch angle of the antenna surface 5 to rotate. The pitch driven shaft 31 mainly plays the role of supporting and stabilizing the antenna surface 5.

[0039] like Figure 5 As shown, an electronic screen 20 can be installed at the end of the pitch mechanism (for example, the end where the pitch active shaft 19 is located) to display information such as the current pitch angle. The wiring of the electronic screen 20 passes through the pitch active shaft 19, passes through the central axis of the servo module 21, and then is routed to the electronic board in the chassis 14. In order to protect the wiring, Figure 1 As shown, at the end of the pitch mechanism where the pitch driven shaft 31 is located, a wire shielding cover 1 is provided to protect the wires and the like.

[0040] In order to ensure the support of the antenna surface 5, the feed arm 2, etc., and sufficient accommodation space for the servo module 21, in some embodiments, a pitching mechanism is provided with a pitching horizontal plate 25 and a pitching vertical plate 23. The pitching horizontal plate 25 is connected to the output shaft of the azimuth adjustment component. The pitching vertical plate 23 is composed of two pieces, which are respectively vertically connected to the two sides of the pitching horizontal plate 25. The two pitching vertical plates 23 and the pitching horizontal plate 25 form an accommodation space. The servo module 21 is installed in the accommodation space and connected to a certain piece ( Figure 5 On the pitch plate 23, the pitch bearing 32 is connected to the other ( Figure 5 The accommodating space is shielded and protected by a pitch cover 4.

[0041] In the aforementioned embodiment, the pitch module can only drive the antenna surface 5, and there is a maximum relative angle between the antenna surface 5 and the feed arm 2. If the angle exceeds this, the antenna surface 5 cannot reflect the signal to the feed horn at the end of the feed arm 2. Therefore, it is necessary to ensure that after the antenna surface 5 and the feed arm 2 reach the maximum relative angle, if the antenna surface 5 continues to rotate, the feed arm 2 will rotate along with it. To this end, in some embodiments, such as Figure 6As shown, a ball plunger 33 is provided on the rotation axis of the antenna surface 5, and an arcuate slot 46 is provided on the rotation axis of the feed arm 2. This arcuate slot 46 is located in the active area (path) of the ball plunger 33 during rotation, and the ball plunger 33 extends into this arcuate slot 46. When the antenna surface 5 rotates, the ball plunger 33 rotates at a certain angle, where it contacts the end of the arcuate slot 46, representing the maximum relative angle between the antenna surface 5 and the feed arm 2. At this end position, the arcuate slot 46 is provided with a spherical groove 50 (i.e., the position of the ball groove 50 is called the end position, even if there is still room for movement in the arcuate slot 46). The ball plunger 33 then extends into this spherical groove 50 under the action of elastic force. In this state, the antenna surface 5 and the feed arm 2 remain relatively stationary. If the antenna surface 5 continues to rotate, the feed arm 2 rotates accordingly under the action of the ball plunger 33. After rotating to a certain angle, when the pitch angle of the antenna surface 5 needs to be reduced in the opposite direction, the antenna surface 5 will drive the feed arm 2 to rotate synchronously due to the limiting effect of the spherical groove 50 on the ball plunger 33. After the feed arm 2 contacts the chassis 14, the antenna surface 5 continues to rotate under the action of the pitch module so that the ball plunger 33 disengages from the spherical groove 50. In this state, the ball plunger 33 can continue to slide in the arc-shaped slide 46, and the antenna surface 5 no longer remains relatively stationary with the feed arm 2. The antenna surface 5 can continue to rotate until it reaches the folded state. It should be noted that such a ball plunger 33-arc-shaped slide 46 can be a pair or multiple pairs, such as Figure 6 An embodiment in which two pairs are designed is shown.

[0042] Because the servo motor 13 or servo module 21 controls the azimuth and elevation rotation, the pitch mechanism and antenna surface 5 must be prevented from rotating uncontrollably, i.e., within a certain set range. For example, the azimuth angle of the pitch mechanism rotates between -170 degrees and 170 degrees, while the pitch angle of the antenna surface 5 rotates between 10 degrees and 90 degrees. Therefore, it is necessary to design corresponding limit mechanisms for the azimuth and elevation adjustment components.

[0043] In some embodiments, to limit the pitch angle of the antenna surface 5, a pitch limit magnet 34 is provided on the rotating shaft of the antenna surface 5. The pitch mechanism is provided with pitch magnetic switches corresponding to the maximum operating angle position and the retracted position of the antenna surface 5. A maximum operating angle limit magnetic switch 35 is provided for the maximum operating angle position, and a retracted limit magnetic switch 36 is provided for the retracted position. Thus, when the antenna surface 5 rotates in pitch, the rotation range of the pitch limit magnet 34 is limited by the two magnetic switches.

[0044] In some embodiments, for limiting the azimuth angle of the antenna surface 5, an azimuth magnetic switch 28 is installed at the bottom of the pitch mechanism, and an azimuth limiting magnet 26 is provided at the top of the chassis 14 corresponding to the extreme azimuth angle position of the pitch mechanism. When the azimuth magnetic switch 28 rotates to the position of the azimuth limiting magnet 26 following the pitch mechanism, the maximum rotation angle is reached.

[0045] In addition, the antenna surface 5 is blocked by the chassis 14 and the feed arm 2 during the pitch rotation, but the pitch mechanism is not blocked during the azimuth rotation. In order to avoid failure of the electronic limit mechanism, or for the case where the electronic limit mechanism is not adopted, in some embodiments, an azimuth limit pin 24 is provided at the bottom of the pitch mechanism, and an azimuth limit column 29 is provided at the top of the chassis 14 corresponding to the extreme azimuth position of the pitch mechanism. In this way, the azimuth limit pin 24 cannot break through the limitation of the azimuth limit column 29.

[0046] In addition, in some embodiments, the polarization angle of the received signal is adjusted on the feed arm 2 .

[0047] like Figure 7 As shown, the two ends of the polarization adjustment component connected to the feed arm 2 are connected to the transceiver 47 and the feed horn 48 respectively. Figure 1 As shown, the feed arms 2 are connected from both sides of the polarization adjustment assembly, the transceiver 47 is located between the feed arms 2 on both sides, and the transceiver 47 is routed inside the wire shield 3 on the feed arm 2.

[0048] The polarization adjustment assembly includes a waveguide cavity 41 connected to a transceiver 47. A polarization knob 38 is mounted on the waveguide cavity 41. A polarization rotor 40 is located within the waveguide cavity 41 and connected to the polarization knob 38. Rotating the polarization knob 38 rotates the polarization rotor 40, thereby adjusting the polarization channel. Furthermore, a tightening screw 39 is mounted on the polarization knob 38, and a polarization limiting magnet 37 is mounted on the top of the waveguide cavity 41. For example, a limiting magnet 47 is mounted corresponding to the rotation angle position of each polarization channel. The tightening screw 39 and the polarization limiting magnet 47 cooperate to limit the polarization adjustment.

[0049] In some embodiments, the feed horn 48 is connected to the polarization adjustment assembly via a bent waveguide 42. Furthermore, in some embodiments, the bent waveguide 42 can also be rotated to a certain angle on the polarization adjustment assembly. An adapter flange 45 is connected to the end of the polarization adjustment assembly. A transfer waveguide 44 is connected to the adapter flange 45. The bent waveguide 42 is docked with the transfer waveguide 44 and can rotate around the transfer waveguide 44. Furthermore, a horn rotation limiting magnet 43 is provided on the transfer waveguide 44, and a magnetic body that matches the horn rotation limiting magnet 43 is provided on the bent waveguide 42. Thus, when the bent waveguide 42 is rotated, the horn rotation limiting magnet 43 can limit its rotation angle.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A portable satellite communication terminal, characterized in that: The invention comprises a chassis (14), a pitch mechanism is installed on the top of the chassis (14), a support leg is installed on the bottom of the chassis (14), an antenna surface (5) and a feed arm (2) are coaxially hinged on the pitch mechanism; an azimuth adjustment component is installed in the chassis (14), the pitch mechanism is connected to the output shaft of the azimuth adjustment component, a pitch adjustment component is installed in the pitch mechanism, and the output shaft of the pitch adjustment component is coaxially connected to the antenna surface (5); the output shaft of the azimuth adjustment component and the output shaft of the pitch adjustment component are perpendicular to each other.

2. The portable satellite communication terminal according to claim 1, wherein: The azimuth adjustment component comprises a servo motor (13), a transmission component and a harmonic reducer (7); the servo motor (13) is connected to the harmonic reducer (7) via the transmission component; and the rotating shaft of the harmonic reducer (7) serves as the output shaft of the azimuth adjustment component.

3. The portable satellite communication terminal according to claim 2, wherein: A radial adjustment block (12) is installed in the chassis (14), and the servo motor (13) is fixedly installed on the radial adjustment block (12); a mounting mechanism is provided on the radial adjustment block (12), and the mounting mechanism has a degree of freedom of movement in the distance direction between the radial adjustment block (12) and the harmonic reducer (7).

4. The portable satellite communication terminal according to claim 2, wherein: The transmission assembly comprises a driving wheel (11), a synchronous belt (10) and a driven wheel (9), wherein the driving wheel (11) is connected to the output shaft of the servo motor (13), the driven wheel (9) is connected to the harmonic reducer (7), and the synchronous belt (10) is connected between the driving wheel (11) and the driven wheel (9).

5. The portable satellite communication terminal according to claim 1, wherein: The pitch adjustment assembly comprises a servo module (21), a pitch active shaft (19) and a pitch driven shaft (31); the servo module (21) is installed in the pitch mechanism; the pitch active shaft (19) is connected to the output shaft of the servo module (21); the pitch driven shaft (31) is installed on the pitch mechanism on a side opposite to the pitch active shaft (19) through a pitch bearing (32); the pitch driven shaft (31) is coaxial with the pitch active shaft (19); and the antenna surface (5) is circumferentially connected to the pitch active shaft (19) and the pitch driven shaft (31).

6. The portable satellite communication terminal according to claim 5, wherein: The pitch mechanism comprises a pitch transverse plate (25), both sides of which are vertically connected to pitch vertical plates (23), and the servo module (21) and the pitch bearing (32) are respectively connected to the two pitch vertical plates (23).

7. The portable satellite communication terminal according to claim 5, wherein: A ball plunger (33) is provided on the rotating shaft of the antenna surface (5), and an arc-shaped sliding groove (46) is provided on the rotating shaft of the feed arm (2) corresponding to the active area of the ball plunger (33); the ball plunger (33) rotates synchronously with the antenna surface (5), and after contacting the end of the arc-shaped sliding groove (46), drives the feed arm (2) to rotate together.

8. The portable satellite communication terminal according to claim 5, wherein: A pitch limiting magnetic steel (34) is provided on the rotating shaft of the antenna surface (5), and a pitch magnetic switch is provided on the pitch mechanism corresponding to the maximum working angle position and / or the folded position of the antenna surface (5).

9. The portable satellite communication terminal according to claim 1, wherein: An azimuth magnetic switch (28) is installed at the bottom of the pitch mechanism, and an azimuth limiting magnetic steel (26) is provided at the top of the chassis (14) corresponding to the extreme azimuth angle position of the pitch mechanism.

10. The portable satellite communication terminal according to claim 1 or 9, characterized in that: An azimuth limiting pin (24) is provided at the bottom of the pitch mechanism, and an azimuth limiting column (29) is provided at the top of the chassis (14) corresponding to the extreme azimuth angle position of the pitch mechanism.

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